JP5551886B2 - Terminal position detection system and sailor position management system - Google Patents

Terminal position detection system and sailor position management system Download PDF

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JP5551886B2
JP5551886B2 JP2009081866A JP2009081866A JP5551886B2 JP 5551886 B2 JP5551886 B2 JP 5551886B2 JP 2009081866 A JP2009081866 A JP 2009081866A JP 2009081866 A JP2009081866 A JP 2009081866A JP 5551886 B2 JP5551886 B2 JP 5551886B2
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detection
terminal
information
wireless lan
calculation
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JP2010236866A (en
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諭彦 児玉
俊明 久保
信宏 鈴木
吉久 田下
慎 藤井
一磨 矮松
眞次 石原
和正 山本
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三菱重工業株式会社
古野電気株式会社
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Description

  The present invention relates to a terminal position detection system that detects a terminal position by a wireless LAN. More specifically, the present invention relates to a technique that provides a means for easily managing the position detection accuracy in the terminal position detection system and contributes to the rapid discovery of an abnormality.

  Conventionally, a terminal position detection system that includes a wireless LAN terminal as a mobile station and an access point as a base station and can measure the position of the wireless LAN terminal is known. For example, systems in which a wireless LAN terminal can estimate the position of its own device by measuring the electric field strength of an access point are widely known. In addition, the time required for radio waves to reach from a wireless LAN terminal to a plurality of access points is measured, and the position of the terminal is measured at three points from the arrival time difference.

  The moving body position detection system disclosed in Patent Document 1 is also used for confirming and detecting the location and area of the moving body. In this mobile body position detection system, the mobile station possessed by each mobile body is called by the selective call signal from the base station, and responds by transmitting a response signal. The base station measures the received electric field level when receiving the response signal. The operation of this system is roughly divided into a learning cycle and a display cycle. In the learning cycle, the value of the received electric field level for each base station corresponding to the zone of the radio wave from the mobile station is collected to form one detection pattern, and the detection pattern is sequentially obtained while changing the position of the mobile station. The database is created while learning the correspondence between the mobile station and the position of the mobile station. In the display cycle, the zone position where the mobile station exists is detected and displayed by collating the detection pattern obtained when detecting the position of the mobile station with the detection pattern of the database.

JP-A-9-182144

  However, in the configuration of Patent Document 1 described above, for example, when a mobile body is moving with a mobile station, a remote location or a different section is suddenly indicated as a detection result due to variations in received radio wave intensity. There was a case. Therefore, the position of the moving body as a detection result may instantaneously move to an irrelevant position, which may confuse the user. In addition, position detection accuracy may decrease due to various factors such as variations in transmission power of mobile stations (terminals), transmission output of mobile stations, and changes in reception sensitivity of base stations, and there is room for improvement in this regard. It was left.

  The present invention has been made in view of the above circumstances, and a main object thereof is to suppress a decrease in detection position accuracy caused by various causes in a terminal position detection system that detects a terminal position by a wireless LAN. is there.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

According to a first aspect of the present invention, a terminal position detection system having the following configuration is provided. That is, this terminal position detection system includes a plurality of relay machines, a position calculation device, and a display device. The repeater receives a wireless frame transmitted including identification information of the wireless LAN terminal device from a wireless LAN terminal device that moves together with the mobile body, and creates reception state information regarding the reception state. The position calculation device estimates the position of each wireless LAN terminal device by calculation based on the reception state information acquired from the relay station. The display device displays the position estimated by the position calculation device. The position calculation device includes a position estimation unit and an error determination unit. The position estimation unit estimates the position of the wireless LAN terminal device based on the reception state information. The error determination unit is estimated when the current position of the wireless LAN terminal device estimated by the position estimation unit satisfies a predetermined relationship with a past position of the wireless LAN terminal device. The position is determined to be incorrect. The repeater detects reception intensity at the time of reception of the wireless frame from the wireless LAN terminal device, and acquires identification information of the wireless LAN terminal device from the wireless frame. In addition, the repeater includes the reception strength and the identification information, and further includes at least one of a communication speed, a modulation scheme, and a communication error evaluation value at the time of reception of the radio frame. Create The position calculation device includes a registration point reception state information storage unit. In the registration point reception state information storage unit, the position of a plurality of points and each of the relay devices that have received the wireless frame when the wireless LAN terminal device arranged at the point transmits the wireless frame. Can be stored in advance in association with the reception status information created by. When the position calculation device receives reception state information from the repeater, the position calculation device compares the reception state information with registered reception state information that is reception state information stored in the registration point reception state information storage unit. Then, in addition to the difference in reception strength, by calculating the degree of divergence including the evaluation of at least one of the communication speed, modulation method and communication error evaluation value at the time of reception of the radio frame, A selection estimation process is performed for estimating a point corresponding to the determined registered reception state information as the current position of the wireless LAN terminal device. The display device can display the position estimated by the position calculation device, except for the position determined to be an error by the error determination unit.

Thereby, when the position estimated by the position estimation unit is in a positional relationship such that the position is unnaturally moved from the past position, the position can be determined as an error and excluded from the display on the display device. Therefore, the position display behavior in the display device can be prevented from becoming unstable, and a highly reliable terminal position detection system can be provided. Furthermore, since the position estimation of the wireless LAN terminal apparatus is performed using the reception intensity that varies greatly according to the positional relationship between the repeater and the wireless LAN terminal apparatus, good estimation accuracy can be realized. Moreover, since the identification information uniquely given to the wireless LAN terminal device is included in the reception state information, even if there are a plurality of wireless LAN terminal devices, the position can be estimated after each of them is easily identified. . Furthermore, even if the number of relay devices is small, the position of the wireless LAN terminal device can be estimated with good accuracy using various parameters included in the reception status information. Also, the position of the wireless LAN terminal device can be estimated with good accuracy even in an environment where radio waves are easily reflected in a complicated manner, such as a structure with a complicated floor plan.

  In the terminal position detection system, the error determination unit is located outside a predetermined region in which the current position of the wireless LAN terminal device obtained by the position estimation unit includes a position closest to the wireless LAN terminal device. It is preferable that it is determined that there is an error.

  Thereby, since the behavior that the position display in the display device moves discontinuously can be prevented, a stable and natural display can be realized.

  In the terminal position detection system, it is preferable that the error determination unit determines the predetermined area in consideration of a position change up to the closest point of the wireless LAN terminal device.

  Thereby, it is possible to accurately determine whether or not the estimated position is an error in consideration of the moving direction, moving speed, etc. up to the moving object to which the wireless LAN terminal device belongs.

  The terminal position detection system preferably has the following configuration. That is, when the repeater receives the wireless frame from the wireless LAN terminal device, the repeater detects the reception strength, generates reception state information including the reception strength, and transmits the reception state information to the position calculation device. It is configured. When receiving the reception status information from the repeater, the position calculation device calculates an average value for a plurality of reception status information received at present and in the past for at least the reception intensity. When the reception strengths are compared between the reception status information and the registered reception status information, the average value is used as the reception strength in the reception status information.

  Thereby, since it is possible to compare with the registered reception state information in a state where the variation in reception intensity in the reception state is removed in advance, more reliable position estimation can be realized.

  In the terminal position detection system, when the position calculation device calculates an average value of the reception strengths from a plurality of reception state information, the average of the reception state information having a reception strength that is out of a predetermined range. It is preferable to exclude it from the object whose value is calculated.

  As a result, it is possible to exclude extreme reception state information that can be clearly seen as noise, so that it is possible to realize more reliable position estimation.

  In the terminal position detection system, the position calculation device performs calculation for interpolating between a plurality of registration reception state information stored in the registration point reception state information storage unit, thereby obtaining the registration point reception state information. It is preferable that it is possible to estimate reception state information at a point that is not stored in the storage unit and to additionally store this information in the registered point reception state information storage unit.

  As a result, the number of points where the wireless LAN terminal device must actually be taken to the place can be reduced before the system is operated, so that the work load can be reduced.

  The terminal position detection system preferably has the following configuration. That is, when the position calculation device tries to store the new location and the reception status information in the registration location reception status information storage unit in association with each other, any one of the registered reception status information already stored and the new location information is stored. When the degree of deviation from the reception status information is smaller than a predetermined value and the distance between the point corresponding to the registered reception status information and the new location is larger than the predetermined distance, registration warning information is created.

  As a result, it becomes clear at an early stage before the system operation that the reception status information is similar to each other and is confusing, so it is possible to quickly consider measures such as addition of a repeater or layout change.

  In the terminal position detection system, the position calculation device may use a method other than the selection estimation process to determine that the wireless LAN terminal device is located at a point stored in the registration point reception state information storage unit. In the case of estimation or confirmation, the reception status information created by the repeater based on the radio frame transmitted by the wireless LAN terminal device, and the registration corresponding to the location in the content of the registration location reception status information storage unit It is preferable to update the reception status information.

  As a result, the registered reception status information can be appropriately updated as necessary. For example, it is possible to cope with a temporal change in transmission output of a wireless LAN terminal device, a temporal change in reception sensitivity of a repeater, and the like. As a result, position estimation can be performed with good accuracy over a long period of time.

  In the terminal position detection system, the position calculation device evaluates a degree of approximation between the reception state information received from the repeater and the registered reception state information determined to be closest to the reception state information. It is preferable to create the positional accuracy information.

  Thereby, since the position estimation status of the wireless LAN terminal device can be properly grasped using the position accuracy information, the user can make an accurate determination according to the status.

  The terminal position detection system preferably has the following configuration. That is, when the repeater receives the wireless frame from the wireless LAN terminal device, the repeater detects the reception strength, generates reception state information including the reception strength, and transmits the reception state information to the position calculation device. It is configured. When receiving the reception status information from the repeater, the position calculation device calculates an average value for a plurality of reception status information received at present and in the past for at least the reception intensity. The number of reception state information used for calculating the average value of the reception intensity changes based on the position accuracy information.

  As a result, when the position accuracy is not good, stable position estimation accuracy can be realized by increasing the number of reception state information to be averaged. On the other hand, when the position accuracy is good, it is possible to perform position display with an emphasis on real-time characteristics by reducing the number of reception state information to be subjected to average value calculation.

  In the terminal position detection system, it is preferable that the display device displays a position estimated by the position calculation device and also performs a visual display that changes according to the position accuracy information.

  Thereby, since the accuracy of the current position estimation can be easily confirmed by looking at the display device, the situation can be grasped more comprehensively.

  In the terminal position detection system, it is preferable that the display device displays the position estimated by the position calculation device so as to be superimposed on a map indicating a region where position management of the wireless LAN terminal device is performed.

  As a result, the position of the moving body in the management area can be understood more quickly and accurately.

  The terminal position detection system preferably has the following configuration. That is, this terminal position detection system includes a fire detection sensor. When the fire detection sensor detects a fire, the position of the fire detection sensor is displayed on the display device so as to overlap the map.

  Thereby, since the fire occurrence position can be grasped instantaneously in relation to the moving body (person), quick emergency response becomes possible. In addition, since the fire occurrence position, the map, and the position of the moving body can be displayed on one display device, the information can be easily grasped centrally and the display device can be easily downsized.

  In the terminal position detection system, the repeater receives a radio frame transmitted by another repeater, identifies identification information of a repeater that is a transmission source of the radio frame, and reception strength of the radio frame. It is preferable that the inter-relay reception state information including the information can be created.

  This enables useful information to be used as a reference when managing the position estimation accuracy of the position calculation device and for maintenance work, such as changes in the reception sensitivity of the repeater over time, by transmitting and receiving between the repeaters and acquiring their reception status. Can be obtained.

  The terminal position detection system preferably has the following configuration. In other words, the position calculation device is configured to repeatedly acquire the inter-relay reception state information from each of the repeaters. If the current inter-repeater reception status information changes from the latest inter-repeater reception status information and the amount of change is greater than a predetermined value, abnormality information indicating that an abnormality has occurred in the relay is created.

  Thereby, since the abnormality of the repeater can be detected early by self-diagnosis, the position estimation accuracy by the position calculation device can be favorably maintained over a long period.

  The terminal position detection system preferably has the following configuration. That is, the position calculation device includes a registration point reception state information storage unit. In the registration point reception state information storage unit, the position of a plurality of points and each of the relay devices that have received the wireless frame when the wireless LAN terminal device arranged at the point transmits the wireless frame. Can be stored in advance in association with the reception status information created by. When the position calculation device receives reception state information from the repeater, the position calculation device compares the reception state information with registered reception state information that is reception state information stored in the registration point reception state information storage unit. Then, a selection estimation process is performed for estimating that the point corresponding to the registered reception state information determined to be the closest is the current position of the wireless LAN terminal device. In determining the registered reception status information closest to the reception status information, the reception status information and registration related to the other relay devices are registered rather than the difference between the reception status information related to the relay device in which the occurrence of the abnormality is detected and the registered reception status information. Focus on differences in reception status information.

  As a result, it is possible to flexibly cope with a case where an abnormality occurs in a specific repeater and the reliability is lowered, and an accurate position estimation can be realized.

  The terminal position detection system preferably has the following configuration. That is, when the repeater detects that the radio field intensity of the radio frame from the wireless LAN terminal apparatus has dropped below a predetermined value within a predetermined time, the relay station includes the radio wave including the identification information of the wireless LAN terminal apparatus. It is configured to create the intensity reduction information and transmit it to the position calculation device. The position calculation device creates fall detection information when receiving the radio field strength reduction information when the estimated position of the wireless LAN terminal device is in a predetermined fall risk area. The display device displays an abnormality occurrence based on the fall detection information.

  Thereby, since the situation where the fall from the high place of a mobile body is suspected can be detected quickly and displayed on a display device, it is possible to promptly perform a treatment such as instructing a nearby person to rush to the site. In addition, when there is a wireless LAN terminal device in an area where there is no risk of falling from such a high place, even if a sharp decrease in radio field intensity is detected, an error occurrence display is not performed, so that false alarms frequently occur. Can be prevented.

  The terminal position detection system preferably has the following configuration. That is, the wireless LAN terminal device includes an acceleration sensor capable of detecting the fall of the own device, and is configured to transmit a fall detection signal to the relay device when the acceleration sensor detects the fall of the own device. When the position calculation device receives the drop detection signal when the estimated position of the wireless LAN terminal device is in a predetermined drop risk area, the position calculation device creates drop detection information. The display device displays an abnormality occurrence based on the fall detection information.

  Thereby, since the situation where the fall from the high place of a mobile body is suspected can be detected quickly and displayed on a display device, it is possible to promptly perform a treatment such as instructing a nearby person to rush to the site. Moreover, since the fall of the own apparatus is directly detected by the acceleration sensor, the fall of the moving body can be accurately detected. Further, when there is a wireless LAN terminal device in an area where there is no risk of falling from such a high place, an error occurrence display is not performed even if a fall detection signal is received, so that the occurrence of a false alarm can be prevented.

  The terminal position detection system preferably has the following configuration. That is, the wireless LAN terminal device is configured to transmit a fall detection signal to the repeater when it detects a long drop of its own device. The display device displays an abnormality occurrence based on the fall detection signal.

  Thereby, since the long fall of the moving body can be quickly detected and displayed on the display device, it is possible to quickly perform a treatment such as instructing a nearby person to rush to the site.

  The terminal position detection system preferably has the following configuration. That is, the wireless LAN terminal device is configured to transmit a submergence signal to the repeater when it detects submergence of its own device. The display device performs an abnormality occurrence display based on the submergence signal.

  Thereby, since the submergence of the wireless LAN terminal device can be quickly detected and displayed on the display device, it is possible to promptly take measures such as instructing a nearby person to rush to the site.

  The terminal position detection system preferably has the following configuration. That is, this terminal position detection system includes a ship position acquisition device and a sea current information acquisition device. The ship position acquisition device acquires the position of a ship where the terminal position detection system is installed. The ocean current information acquisition device acquires ocean current information around the ship. When performing the abnormality occurrence display, the display device also displays information on the position of the ship and the surrounding ocean current when the abnormality occurs.

  As a result, when a moving body (for example, a sailor) falls from a ship, the occurrence of an abnormality is notified and useful information for rescue is automatically displayed on the display device, so that an appropriate treatment can be performed quickly. Can do.

  The terminal position detection system preferably has the following configuration. That is, this terminal position detection system includes a human body detection device capable of detecting a human body. The human body detection device is arranged at a boundary portion of a predetermined management area set in an area where the position calculation device can estimate the position of the wireless LAN terminal device. The position calculation device creates terminal non-carried person detection information when the human body detection device detects a human body even though the wireless LAN terminal device does not exist in the vicinity of the human body detection device. The display device performs an abnormality occurrence display based on the terminal non-carried person detection information.

  Thereby, an intrusion etc. of a suspicious person can be detected quickly and an appropriate response can be performed.

  The terminal position detection system may have the following configuration. That is, this terminal position detection system includes a human body detection device capable of detecting a human body. The human body detection device is arranged at a boundary portion of a predetermined management area set in an area where the position calculation device can estimate the position of the wireless LAN terminal device. The position calculation device has the wireless LAN terminal device in the vicinity of the human body detecting device or the wireless LAN terminal device in the vicinity of the human body detecting device is stationary for a certain time or more. First, when the human body detection device detects a human body, terminal non-carried person detection information is created. The display device performs an abnormality occurrence display based on the terminal non-carried person detection information.

  That is, when the human body detection device detects a human body and all the wireless LAN terminal devices detected in the vicinity of the human body detection device are stationary, the mobile body (human body) is detected together with the wireless LAN terminal device. It seems that he is not trying to pass through the installation location of the device. Therefore, at this time, by generating the terminal non-portable person detection information, it is possible to accurately detect and display abnormally the terminal non-portable person passing through the gate.

  The terminal position detection system preferably has the following configuration. That is, this terminal position detection system includes a human body detection device capable of detecting a human body. The human body detection device is arranged at a boundary portion of a predetermined management area set in an area where the position calculation device can estimate the position of the wireless LAN terminal device. When the human body detection device detects a human body even though the wireless LAN terminal device passing through the boundary of the management area is not detected at the location of the human body detection device, the position calculation device Create person detection information. The display device performs an abnormality occurrence display based on the terminal non-carried person detection information.

  As a result, when the human body detection device detects a human body, a terminal non-portable person can detect the human body detection device unless the wireless LAN terminal device that passes through the boundary of the management area is detected at the location of the human body detection device. Judged to have passed the installation site. Therefore, it is possible to accurately detect the passage of the terminal non-carried person and display the abnormality.

  The terminal position detection system preferably has the following configuration. That is, this terminal position detection system includes a human body detection device capable of detecting a human body. The human body detection device is arranged at a boundary portion of a predetermined management area set in an area where the position calculation device can estimate the position of the wireless LAN terminal device. At least one of the repeaters is disposed in the vicinity of a human body detection region by the human body detection device. The position calculation device is a terminal when the human body detection device detects a human body even though the reception state information acquired from a repeater arranged in the vicinity of the human body detection region does not satisfy a predetermined condition. Create non-portable person detection information. The display device performs an abnormality occurrence display based on the terminal non-carried person detection information.

  That is, when a moving body (human body) is going to pass through the boundary of the management area together with the wireless LAN terminal device at the location of the human body detecting device, the wireless frame transmitted from the wireless LAN terminal device of the moving body is It should be received fairly well by a repeater placed in the vicinity of the human body detection area of the detection device. In the present invention, using this fact, it is determined that the terminal non-portable person has passed through the detection area of the human body detection device except when the repeater has successfully received the radio frame. Therefore, it is possible to accurately detect the passage of the terminal non-carried person and display the abnormality.

  The terminal position detection system preferably has the following configuration. That is, a plurality of the human body detection devices are provided. The position calculation device determines whether or not the identification information of the wireless LAN terminal device detected in the vicinity of the human body detection device satisfies a passage permission condition determined according to each of the human body detection devices. In that case, pass-permitted person detection information is created. The display device performs an abnormality occurrence display based on the pass-permitted person detection information.

  Thereby, the mobile body which can pass the installation place and the mobile body which cannot pass can be managed for every human body detection apparatus. Further, when a moving body that cannot pass through the place where the human body detection device is installed, an abnormality can be appropriately displayed.

  The terminal position detection system preferably has the following configuration. That is, the terminal position detection system includes a camera that can photograph the human body in conjunction with the human body detection device detecting the human body. When an abnormality occurs, an image captured by the camera can be distributed to the wireless LAN terminal device.

  Accordingly, by promptly disseminating information on the suspicious person, it is possible to prompt the surrounding person to take a more appropriate response.

  The terminal position detection system preferably has the following configuration. That is, forbidden area entry detection information is created when the position of the wireless LAN terminal device estimated by the position calculation apparatus is within a predetermined forbidden area. The display device displays an abnormality occurrence based on the prohibited area entry detection information.

  As a result, it is possible to quickly detect the entry of the moving body into the prohibited area and take an appropriate action.

  The terminal position detection system preferably has the following configuration. That is, the wireless LAN terminal device includes an information display unit. When an abnormality occurs, information indicating the content of the abnormality is distributed to the wireless LAN terminal device and displayed on the information display unit.

  Thereby, by distributing the contents of the abnormality that has occurred to the moving body (person), a large number of persons can quickly start appropriate actions such as rescue and evacuation.

  In the terminal position detection system, when an abnormality occurs, information different between a wireless LAN terminal device whose position estimated by the position calculation device is close to the abnormality occurrence point and a wireless LAN terminal device that is not so is displayed. It is preferably configured to be able to be distributed.

  As a result, an accurate treatment according to the positional relationship with respect to the abnormality occurrence location is possible.

  In the terminal position detection system, the repeater is installed on both floors adjacent in the vertical direction in a multi-floor building, and the upper floor repeater is connected to the lower floor repeater. It is preferable that they are arranged so as not to correspond to the vertical direction.

  Thereby, even when the number of relay devices is small (for example, two per floor), the position of the wireless LAN terminal device can be estimated with good accuracy. Therefore, the installation cost of the system can be reduced and the wiring is simplified.

  According to a second aspect of the present invention, there is provided a sailor position management system in which the terminal position detection system is installed in a ship and the sailor is carried by the wireless LAN terminal device.

  Thereby, the sailor position management system which can estimate a sailor's position accurately via a wireless LAN terminal device can be provided.

Schematic which showed the whole structure of the terminal position detection system which concerns on one Embodiment of this invention. The functional block diagram of a wireless LAN terminal device. Functional block diagram of a repeater. The functional block diagram of a position calculating apparatus. The figure which shows notionally the memory content of a reception status information storage part. The figure which shows the example of the point which transmits a radio | wireless frame from a wireless LAN terminal device in a ship before the system operation. 7 is a graph showing the radio field intensity measured by each relay when the wireless LAN terminal device transmits a wireless frame from each point in FIG. The conceptual diagram which shows a mode that an error determination part determines the position of the wireless LAN terminal device which the point selection part estimated. The functional block diagram of a display apparatus. The figure which shows the example of drawing on the display by a display apparatus. The conceptual diagram which shows the drawing layer in a drawing part.

  Next, embodiments of the invention will be described. FIG. 1 is a schematic diagram showing the overall configuration of a terminal position detection system 1 according to an embodiment of the present invention.

  A terminal position detection system 1 shown in FIG. 1 is for detecting and visually displaying the position of a detection target person (moving body) 100 in real time in a ship 201 as a building. Although various people can be considered as this detection target, they are typically sailors, passengers, and related persons of the ship 201.

  The terminal position detection system 1 includes a plurality of wireless LAN terminal devices 2, a plurality of relay devices 3, a position calculation device 4, and a display device 5. The repeater 3 and the position calculation device 4 are connected to each other by a wired LAN 6.

  In the present embodiment, the wireless LAN terminal device 2 is configured as a VoIP terminal that the detection target person 100 always carries. The repeater 3 is configured as a wireless LAN access point. With the above configuration, a local area network (LAN) combining wireless and wired communication is constructed.

  Each wireless LAN terminal device 2 is assigned a unique identifier (identification information) for identifying the wireless LAN terminal device 2. The wireless LAN terminal device 2 can transmit a wireless frame including the identifier information.

  The repeater 3 is installed in a position detection target area set in advance so as to include almost the entire ship. Each of the plurality of relay devices 3 receives the wireless frame from the wireless LAN terminal device 2 regardless of where the wireless LAN terminal device 2 is located in the position detection target area. The layout is properly defined so that it can be done. When each wireless relay device 3 receives a wireless frame from the wireless LAN terminal device 2, each relay device 3 creates reception state information based on the wireless frame and transmits it to the position calculation device 4 via the wired LAN 6.

  In the present embodiment, the ship 201 is configured such that the cabin portion has a plurality of floors. In the cabin part, the repeaters 3 are arranged on each of a plurality of floors, and each repeater 3 is arranged at a position that does not correspond to the repeater 3 on the upper floor or the lower floor in the vertical direction. ing. As a result, not only the repeater 3 on the same floor as the wireless LAN terminal device 2 but also the repeater 3 on the upper and lower floors can be efficiently used, so that the number of installed repeaters 3 can be reduced. Position calculation accuracy can be maintained at a practical level. As a result, the equipment cost can be reduced.

  The position calculation device 4 and the display device 5 are devices for managing the position of a sailor, and are installed, for example, in a bridge portion of a ship. The position calculation device 4 operates as a server, and includes a CPU as a control device and a processing device, a ROM and a RAM as storage devices, and the like. The position calculation device 4 estimates the position of each wireless LAN terminal device 2 (and thus the position of the detection target person 100 carrying the wireless LAN terminal device 2) by calculation based on the reception state information received from each relay device 3. Terminal location information is created. The terminal position information is transmitted to the display device 5, and the display device 5 displays the position of the detection target person 100 based on the terminal position information.

  A GPS device (ship position acquisition device) 7 and a current information acquisition device 8 are connected to the wired LAN 6, and the position of the ship and the surrounding current information can be acquired.

  Further, a fire detection sensor 9 is disposed at an appropriate position of the ship 201, and this fire detection sensor 9 is connected to a fire place acquisition device 10 connected to the wired LAN 6. When receiving the fire detection signal from the fire detection sensor 9, the fire place acquisition device 10 can transmit the position of the fire detection sensor 9 to the position calculation device 4 together with a signal to that effect (fire detection signal). In addition, this fire detection sensor 9 may be arrange | positioned in the area | region which manages the position of the wireless LAN terminal device 2, and may be arrange | positioned outside the said area | region.

  A gate passage detection device 11 as a human body detection device is arranged at a gate 202 as a boarding port and a lower boat opening of the ship 201. The gate passage detection device 11 includes an infrared sensor 12 as a human body sensor and a camera 13 as an image photographing device.

  With this configuration, the gate passage detection device 11 can automatically photograph the person 101 with the camera 13 when the infrared sensor 12 detects the person 101 who is about to pass through the gate 202. The gate passage detection device 11 is connected to a wireless LAN, and is configured to transmit a signal indicating that a human body has been detected or an image taken by the camera 13 to the position calculation device 4 via the relay 3. .

  Further, the position calculation device 4 may detect an abnormality caused by various factors and output abnormality information. When this abnormality information is input, the display device 5 displays on the display that an abnormality has occurred (abnormality display). As described above, the display device 5 can display various information on the single display in addition to the position of each wireless LAN terminal device 2.

  Next, the configuration of the wireless LAN terminal device 2 will be described with reference to FIG. FIG. 2 is a functional block diagram of the wireless LAN terminal device 2.

  A wireless LAN terminal device 2 shown in FIG. 2 is configured as a wireless VoIP terminal. The wireless LAN terminal device 2 includes a wireless transceiver 21, an antenna 22, a display (information display unit) 23, a microphone 24, a speaker 25, a water detection sensor 26, an acceleration sensor 27, and an SOS switch 28. And an emergency information creating unit 29. The wireless LAN terminal device 2 includes hardware such as a CPU, a ROM, and a RAM (not shown).

  The wireless transceiver 21 is wirelessly connected to the repeater 3 and communicates in units of data packets (MAC frames), and can exchange various data such as voice, image, text message, and the like. The wireless transceiver 21 includes a MAC address storage unit 21a composed of a read-only memory, and the MAC address as the identifier is stored in the MAC address storage unit 21a. This MAC address is assigned so as to be uniquely determined for each wireless transceiver 21, and is used as an address indicating the destination and source of the MAC frame.

  The wireless LAN terminal device 2 can transmit a MAC frame defined by, for example, IEEE802.11b at a predetermined time interval (for example, once every 1 to 3 seconds) using the wireless transceiver 21. . This MAC frame includes the MAC address of the source wireless LAN terminal device 2 (that is, its own device), user data in which the above-mentioned various data are stored, and a frame check sequence (FCS). FCS is for detecting bit errors that occur during data transmission. In this embodiment, 32-bit cyclic redundancy check (CRC) is used as an error detection technique.

  The radio transmitter / receiver 21 adds a physical layer header to the MAC frame as appropriate, and transmits the MAC frame to the counterpart device as a radio frame. Of the physical layer header, the PLCP header (physical layer convergence protocol header) includes information on the data transmission rate and modulation method used for actual transmission. Note that the data transmission rate and the modulation method at the time of transmitting the MAC frame are appropriately changed according to the radio wave condition at that time.

  The wireless LAN terminal device 2 includes a display 23 that can display various types of information. When the wireless transceiver 21 receives a MAC frame transmitted from another device, the wireless LAN terminal device 2 is configured to extract an image, a text message, etc. from the MAC frame and display it on the display 23. ing.

  The microphone 24 and the speaker 25 function as an audio input unit and an audio output unit for causing the wireless LAN terminal device 2 to function as a VoIP terminal. The audio data input from the microphone 24 is appropriately digitally encoded and packetized, and the wireless transceiver 21 transmits the packet to another device as a wireless frame. On the other hand, when a packet of audio data is transmitted to the wireless transceiver 21, the audio data is appropriately restored and output from the speaker 25.

  The water detection sensor 26 is for detecting that the detection subject 100 carrying the wireless LAN terminal device 2 has fallen from a ship deck, for example. The water detection sensor 26 outputs an appropriate signal to the emergency information creation unit 29 when water is detected. The emergency information creation unit 29 to which this signal has been input determines that the wireless LAN terminal device 2 has been submerged (together with the person to be detected 100), and causes the wireless transceiver 21 to wirelessly transmit information indicating that water has been detected.

  Similarly, the acceleration sensor 27 is for detecting the water fall of the person 100 to be detected. The output signal of the acceleration sensor 27 is input to the emergency information creation unit 29. The emergency information creation unit 29 continuously detects a state in which the acceleration sensor 27 is close to weightless for a predetermined time or more, and if a large acceleration is detected immediately thereafter, the wireless LAN terminal device 2 is high (together with the detection target person 100). The wireless transmitter / receiver 21 wirelessly transmits information indicating that water has fallen from the place.

  The SOS switch 28 is for notifying other devices of the occurrence of an emergency. For example, when a ship crew member (detection target person 100) witnesses an invasion of a pirate, an accident in a dangerous area, or the like, the SOS switch 28 of the wireless LAN terminal device 2 that is being carried is pressed. An operation signal of the switch 28 is input to the emergency information creation unit 29. The emergency information creation unit 29 that has detected the operation of the SOS switch 28 creates emergency information and causes the wireless transceiver 21 to transmit the emergency information. Thereby, occurrence of danger can be notified quickly.

  Next, the configuration of the repeater 3 will be described with reference to FIG. FIG. 3 is a functional block diagram of the repeater 3.

  The repeater 3 as a base station shown in FIG. 3 exchanges various data by transmitting / receiving wireless frames to / from the wireless LAN terminal device 2 and can measure the intensity of radio waves transmitted from the wireless LAN terminal device 2. It is configured. The repeater 3 includes a radio transceiver 31, an antenna 32, an error degree calculation unit 33, and a reception state information creation unit 34. The repeater 3 includes hardware such as a CPU, a ROM, and a RAM (not shown).

  The wireless transceiver 31 is configured to transmit and receive wireless frames to and from the wireless transceiver 21 of the wireless LAN terminal device 2. The wireless transceiver 31 includes a MAC address storage unit 31a, a MAC address acquisition unit 31b, a radio wave intensity measurement unit 31c, a communication condition acquisition unit 31d, and a communication error detection unit 31e.

  Similar to the MAC address storage unit 21a of the wireless LAN terminal device 2, the MAC address storage unit 31a is configured to store a MAC address that is a unique identifier.

  The MAC address acquisition unit 31b is configured to analyze the wireless frame received from the wireless LAN terminal device 2 and acquire the MAC address of the wireless LAN terminal device 2 that is the transmission source.

  The radio wave intensity measurement unit 31c is configured to measure radio wave intensity (reception intensity) when a radio frame is received from the wireless LAN terminal device 2.

  The communication condition acquisition unit 31d can acquire the transmission rate and the modulation method when the wireless frame is received by analyzing the PLCP header included in the wireless frame received from the wireless LAN terminal device 2.

  The communication error detection unit 31e calculates a CRC based on the content of the wireless frame received from the wireless LAN terminal device 2, and collates with the FCS. Then, it is possible to determine whether or not a communication error has occurred based on the collation result, and to output the result to the error degree calculation unit 33. Since the detection of the communication error is repeatedly performed at a predetermined time interval, the detection result (the presence / absence of the communication error) is input to the error degree calculation unit 33 one after another.

  The error level calculation unit 33 can store a plurality (specifically, 4) of error detection results that have been input most recently, and calculate the error level by performing a predetermined calculation based on the error detection results. can do. This error degree is a value obtained by evaluating whether or not a communication error is likely to occur frequently. The error degree is close to 1 in a situation where errors frequently occur, whereas the error degree is 0 if no error occurs. become.

  Specifically, the calculation of the error degree is performed as follows. That is, first, the contents of the work variable are reset to zero. Next, when the latest error detection result is “with error”, 0.4 is added to the content of the work variable (when it is “without error”, it is not added). Similarly, when the second new detection result is “with error”, 0.3, when the third is “with error”, 0.2, and when the fourth is “with error” 0.1 is added to each work variable. The value of the work variable obtained by the above calculation is the error level.

  When the wireless transceiver 31 of the relay device 3 receives the wireless frame from the wireless LAN terminal device 2, the reception state information creation unit 34 creates information (reception state information) regarding the reception state from the wireless LAN terminal device 2. . This reception state information includes the MAC address of the wireless LAN terminal device 2 obtained by the MAC address acquisition unit 31b and the MAC address of the relay 3 itself stored in the MAC address storage unit 31a. Further, the reception state information includes the radio field intensity measured by the radio field intensity measurement unit 31c, the data transmission rate and modulation method acquired by the communication condition acquisition unit 31d, and the error level calculated by the error level calculation unit 33. , Including. The reception state information creation unit 34 transmits the created reception state information to the position calculation device 4 via the wired LAN 6.

  Next, the configuration of the position calculation device 4 will be described with reference to FIG. FIG. 4 is a functional block diagram of the position calculation device 4.

  The position calculation device 4 shown in FIG. 4 receives a wireless frame transmitted from one wireless LAN terminal device 2 by one or a plurality of relay devices 3, and based on reception state information created by each relay device 3. The position of the wireless LAN terminal device 2 can be estimated.

  The position calculation device 4 includes a reception state information acquisition unit 41, a reception state information storage unit 42, a registered spot reception state information storage unit 43, a position history information storage unit 44, a region characteristic information storage unit 45, and a calculation unit. 46.

  The reception status information acquisition unit 41 is configured to receive the reception status information created by the relay device 3 via the wired LAN 6 and store it in the reception status information storage unit 42.

  Here, when a wireless frame transmitted by one wireless LAN terminal device 2 is received by a plurality of surrounding relay devices 3, each of the relay devices 3 creates reception state information for the wireless frame. . Accordingly, in this case, a plurality of pieces of reception state information are created based on one transmission of the wireless frame by the wireless LAN terminal device 2, and each is stored in the reception state information storage unit 42.

  FIG. 5 conceptually shows an example of the contents stored in the reception state information storage unit 42. In the table of FIG. 5, one row represents one reception state information. The upper three rows (first row to third row) in the table show the wireless frame transmitted by the wireless LAN terminal device 2 having the MAC address [AA: BB: CC: DD: EE: 01], and the MAC address [AB : CD: EF: 00:00:01] to [03], which are reception status information respectively received by the three repeaters 3.

  Further, as shown in the fourth row of the table, when the wireless LAN terminal device 2 having another MAC address transmits a wireless frame, it is stored in the reception state information storage unit 42 in the same manner.

  Although not shown in detail, the reception state information storage unit 42 may store a plurality of pieces of reception state information in which the MAC address of the wireless LAN terminal device 2 on the transmission side and the MAC address of the relay device 3 on the reception side are equal to each other. it can. Thereby, the average value can be calculated among a plurality of pieces of reception state information regarding the radio wave intensity and the error level, which are quantitative information. How far past reception status information is used when calculating the average value (the number of reception status information used for calculating the average value) can be arbitrarily determined, but it depends on the value of position accuracy information described later. Can be changed dynamically. In addition, when the radio field strength value is outside the predetermined range that is normally assumed as the range of radio field intensity, the data is ignored when calculating the average value. Excessive variation can be prevented.

  The registration point reception state information storage unit 43 is a relay station that has received a wireless frame when the wireless LAN terminal device 2 is located at a predetermined point and transmits a wireless frame at a preparatory stage before system operation. The reception status information created by each of the three is stored. This reception state information is stored in the registration point reception state information storage unit 43 in a form associated with the position of the wireless LAN terminal device 2. In the following description, the reception state information stored in the registration point reception state information storage unit 43 may be referred to as “registered reception state information”.

  In FIG. 6, points A to J indicate points at which wireless frames are transmitted from the wireless LAN terminal device 2 at the preparation stage (points at which reception state information is registered). FIG. 6 is a plan view showing a part of the structure in the ship, and relay devices 3p, 3q, 3r are arranged at appropriate locations.

  FIG. 7 is a graph showing the radio field intensity measured by each of the repeaters 3p, 3q, 3r when the wireless LAN terminal device 2 transmits a wireless frame from each point shown in FIG.

  The radio field intensity measured by the relay devices 3p, 3q, 3r decreases as the position of the wireless LAN terminal device 2 (the transmission point of the wireless frame) moves away from the relay device 3, and the relay device 3 and the wireless LAN terminal device 2 If there is an obstacle such as a wall between them, it tends to decrease further. In addition, the radio wave condition is greatly affected by the shape of the wall in the ship. Therefore, the combination pattern of the radio wave intensity detected by each of the repeaters 3p, 3q, and 3r often changes greatly only by moving from one point to another nearby point.

  In the present embodiment, paying attention to this, a combination pattern of radio field strengths (reception state information combination patterns) of each of the repeaters 3p, 3q, and 3r as shown in FIG. 7 is registered in association with the position information of the point. The point reception state information storage unit 43 stores the information in advance. Note that FIG. 7 shows changes for each point of only the radio wave intensity for easy understanding of the explanation, but other information (for example, transmission speed, modulation, etc.) obtained by each repeater 3p, 3q, 3r. Of course, the registration point reception state information storage unit 43 also stores the method and error degree). This registered reception status information is used to collate with the reception status information stored in the reception status information storage unit 42.

  As preparatory work before system operation, while moving the wireless LAN terminal device 2 throughout the ship 201, the radio wave intensity from the wireless LAN terminal device 2 is measured by each repeater 3 to create reception status information, This reception state information is stored in the registration point reception state information storage unit 43 of the position calculation device 4 together with the position information.

  However, in this preparatory work, the wireless LAN terminal device 2 is moved only to the main points to register the position information and the reception state information, and for the reception state information of other points, the estimated value by the interpolation calculation is used as the position information. It can also be set as the structure registered into the arithmetic unit 4. FIG. In this case, the burden of advance preparation can be reduced.

  In addition, there may be cases where the combination patterns of reception states (for example, radio wave intensity) are similar by chance even though the points are sufficiently separated from each other. This causes the position detection accuracy to deteriorate. Therefore, in the position calculation device 4 of the present embodiment, every time a new point and reception state information are newly registered, the reception state information is already registered. The degree of deviation from each of the registered reception status information is calculated. As this divergence degree, for example, a matching distance described later may be used.

  If the degree of divergence between the reception status information for which new registration is specified and any of the registration reception status information is smaller than a predetermined value (that is, if they are similar), the position calculation device 4 calculates the distance between the point corresponding to the registered reception status information and the point to be registered this time. When the calculated distance is greater than the predetermined distance, the position calculation device 4 creates registration warning information, and a predetermined warning is output to the display device 5, for example, based on this. Thereby, since it is possible to warn before starting the system operation that there is a point where there is a high possibility that the position is erroneously detected, measures such as a layout change of the repeater 3 can be considered at an early stage.

  The area characteristic information storage unit 45 shown in FIG. 4 includes information on a predetermined area (for example, a deck) in a ship where there is a risk of falling water, and an area of the engine room in which crew members other than the engineer should not enter in principle. This information is stored. The above-mentioned restricted entry areas can be individually determined for each sailor (that is, for each wireless LAN terminal device 2).

  The position history information storage unit 44 can store the history of the position of each wireless LAN terminal device 2 obtained by calculation by the calculation unit 46 to be described later, for example, for the last two times.

  The calculation unit 46 is mainly for estimating the current position of the wireless LAN terminal device 2 based on the reception state information stored in the reception state information storage unit 42. The calculation unit 46 includes a matching distance calculation unit 46a, a point selection unit (position estimation unit) 46b, an error determination unit 46c, a position information creation unit 46d, a position accuracy information creation unit 46e, and an abnormality information creation unit 46f. And.

  The matching distance calculation unit 46 a matches the matching distance between the reception state information stored in the reception state information storage unit 42 and each registered reception state information stored in the registration point reception state information storage unit 43 ( The degree of divergence is calculated.

  As elements of the reception state information, there are a modulation method, a communication speed, an error level, etc. in addition to the reception intensity. Therefore, it is preferable that the matching distance is the sum of the values obtained by appropriately evaluating the differences between the above elements. For example, as the matching distance of the portion related to the reception intensity, a value obtained by summing the squares of the difference of the reception intensity in each of the repeaters 3p, 3q, 3r can be used.

  Further, when calculating the matching distance, as described above, an average value calculated among a plurality of reception state information can be adopted as the radio wave intensity or the error degree of the reception state information acquired from the repeater 3. . In this case, the adverse effect of noise can be effectively reduced.

  The point selection unit 46b selects a point corresponding to the registered point reception state information with the smallest calculated matching distance from the points A to J in FIG. Thereby, the position of the wireless LAN terminal device 2 can be provisionally determined.

  The error determination unit 46c inspects whether or not the point (the position of the wireless LAN terminal device 2) obtained by the point selection unit 46b flies unnaturally from the past position stored in the position history information storage unit 44. To do.

  Hereinafter, the purpose of the error determination unit 46c will be specifically described. That is, for example, when the detection target person 100 located at the point C in FIG. 6 heads to another place, the detection target person 100 must always pass the B point or the D point because of the floor plan in the ship. . Therefore, if the time interval for detecting the position of the wireless LAN terminal device 2 is set to be sufficiently short, it is very unlikely that the wireless LAN terminal device 2 that has been at the point C until immediately before will suddenly move to the point F, for example. It can be said that the case should be ignored as a false detection.

  Therefore, the error determination unit 46c determines that an error has occurred in position detection when the estimated position obtained by the point selection unit 46b is unnatural due to the relationship with the past position of the wireless LAN terminal device 2. On the other hand, in the case of small movement such that the wireless LAN terminal device 2 moves between adjacent points, the error determination unit 46c determines that the position estimation is normal.

  Next, the concept of an error determination method by the error determination unit 46c will be described with reference to FIG. In FIG. 8A, the position estimated by the point selection unit 46b is indicated by a symbol P1, and the position of the wireless LAN terminal device 2 immediately before (nearest) is indicated by a symbol P0.

  The error determination unit 46c first determines a circular area (allowable area) Q centered on the nearest position P0. If the position P1 estimated by the point selection unit 46b is within the allowable area Q, it is determined to be normal, and if the position P1 is located outside the allowable area Q, it is determined to be an error. .

  In the example of FIG. 8A, the position P1 is determined to be normal. However, if P2 is estimated instead of the position P1 as the position estimated by the point selection unit 46b, the position P2 is determined to be an error.

  FIG. 8A shows an example of the case where the wireless LAN terminal device 2 is stationary on the spot until recently, and in this case, the allowable area Q is a circle centered on the nearest position P0. It is considered as an area. However, the shape and size of the permissible area Q can be changed as appropriate based on the change in the position of the wireless LAN terminal device 2 up to the latest (at least one of the moving direction and the moving speed). FIG. 8B shows a case where the wireless LAN terminal device 2 has moved to the nearest position. In this case, the allowable area Q is slightly elongated so as to cover the front side in the moving direction to some distance. It is formed. Note that the change in the position of the wireless LAN terminal device 2 until the most recent time can be acquired by comparing the most recent position P0 with the previous position.

  The location information creation unit 46d creates location information based on the location of the wireless LAN terminal device 2 obtained by the point selection unit 46b, which has been determined to be error-free by the error determination unit 46c. This position information includes data representing the position of the wireless LAN terminal device 2 in coordinates and information on the MAC address of the wireless LAN terminal device 2. The created position information is transmitted to the display device 5.

  The position accuracy information creation unit 46e creates position accuracy information based on the matching distance between the reception state information and the registered reception state information corresponding to the point selected as the position of the wireless LAN terminal device 2. The created position accuracy information is transmitted to the display device 5.

  For example, when the wireless LAN terminal device 2 enters an area where entry is prohibited in the area characteristic information storage section 45, the abnormality information creation section 46f creates abnormality information indicating an abnormality. This determination of presence / absence of entry is obtained from, for example, the position information creation unit 46d by previously storing the coordinate data of each vertex when the restricted entry region is expressed by a combination of rectangles in the region characteristic information storage unit 45. This can be done by comparing the coordinates of the position of the wireless LAN terminal device 2 with the coordinates of the vertex of the rectangle. The created abnormality information is transmitted to the display device 5.

  In the above description, the position calculation device 4 is configured to estimate the position of the wireless LAN terminal device 2 based on the stored contents of the registration point reception state information storage unit 43. Even if not, the location of the wireless LAN terminal device 2 may be confirmed or estimated due to special circumstances.

  In addition, for example, a detection target person 100 carrying the wireless LAN terminal device 2 walks toward the repeater 3 along a straight and long road having the repeater 3 disposed at one end, and a T-shaped branching portion in the middle. Suppose that Then, since the radio wave is transmitted also to the side road, the radio wave intensity received by the repeater 3 at that time slightly decreases. Therefore, it is possible to estimate that the wireless LAN terminal device 2 is located at the branching portion by monitoring such behavior of the radio wave intensity.

  And when one of the points memorize | stored in the registration point reception status information memory | storage part 43 is set as the branch path, the position calculating apparatus 4 will be in the time of the wireless LAN terminal device 2 approaching the said branch part. With the reception status information obtained from the repeater 3, the existing registered location reception status information relating to the point can be updated. As a result, the registration point reception state information can be appropriately updated in response to a change with time in the reception sensitivity or the like of the repeater 3, so that it is possible to perform position estimation with good accuracy over a long period.

  Next, the configuration of the display device 5 will be described with reference to FIG. FIG. 9 is a functional block diagram of the display device 5.

  The display device 5 shown in FIG. 9 is configured to receive various information such as the position of the wireless LAN terminal device 2 from the position calculation device 4 and visually display various information. The display device 5 includes a ship map storage unit 51, a drawing unit 52, and a display 53.

  The ship map storage unit 51 is configured to be able to store map data representing a map in the ship. This map is registered in the ship map storage unit 51 by an appropriate operation before the system is operated.

  The drawing unit 52 draws predetermined information on the display 53 based on the map data, the position information received from the position calculation device 4, the abnormality information, and the like.

  FIG. 10 shows a display example of the display 53. In this example, a ship map 111 is drawn, and a human figure 112 is displayed at the position of the wireless LAN terminal device 2 detected by the position calculation device 4. Has been. Needless to say, the display position of the graphic 112 is constantly updated as the detection position of the wireless LAN terminal device 2 changes.

  As shown in FIG. 10, the drawing unit 52 of the present embodiment is configured to display a circle 113 representing the accuracy of position estimation at the same position as the human figure 112. This circle is displayed while its size is updated according to the position accuracy information created by the position accuracy information creation unit 46e of the position calculation device 4. Specifically, a small circle is displayed when the matching distance is small, and a large circle is displayed when the matching distance is large. Thereby, the user can intuitively understand the accuracy of position estimation.

  Further, when the display device 5 receives the abnormality information from the position calculation device 4, the display device 5 is configured to perform an abnormality display 114 on the display 53. The abnormality display 114 is a character string “CAUTION !!!” in this embodiment, but can be changed to a different character string or figure depending on the circumstances. Further, if the display device 5 is provided with a speaker and is configured to output an alarm sound together with the abnormality display, it is advantageous because an alerting effect is enhanced.

  FIG. 11 conceptually shows a drawing method performed by the drawing unit 52. The drawing unit 52 internally includes a map layer 121, a position display layer 122, and an abnormality display layer 123. These layers 121, 122, and 123 are configured as bitmap data independent of each other. The drawing unit 52 draws the map 111 on the map layer 121, the circle 113 representing the accuracy of the human figure 112 and the position estimation on the position display layer 122, and the abnormal display 114 on the abnormal display layer 123. Combine three layers. As a result, as shown in FIG. 9, it is possible to display a screen in a state where a human figure 112, an abnormal display 114, and the like are superimposed on a map 111 on a single display 53.

  With this configuration, since the location of each sailor (detection target person 100) can be grasped in real time, for example, when an operation in an engine room or the like occurs, it is possible to request a sailor in the vicinity. As a result, business efficiency can be improved.

  Next, an operation when the water detection sensor 26 detects falling water or the SOS switch 28 is pressed on the wireless LAN terminal device 2 side will be described. The emergency information creation unit 29 of the wireless LAN terminal device 2 creates emergency information according to the situation and transmits the emergency information from the wireless transceiver 21. This emergency information is output to the position calculation device 4 via the repeater 3. The position calculation device 4 that has received the emergency information creates abnormality information and transmits it to the display device 5, and causes the display device 5 to display an appropriate warning based on this information. At this time, the display device 5 simultaneously displays the position of the wireless LAN terminal device 2 together with the warning display. Thereby, it is possible to quickly grasp the position of the site where water has fallen.

  In addition, even if the radio wave of the wireless LAN terminal device 2 detected by the repeater 3 suddenly weakens or is lost, a sailor or the like falls. In order to appropriately cope with this, the repeater 3 includes a radio wave intensity lowering information creating unit (not shown), and the radio wave intensity of the wireless frame of the wireless LAN terminal device 2 has greatly decreased below a predetermined value within a predetermined time. Is detected, information to that effect (radio wave intensity reduction information) is created and transmitted to the position calculation device 4. Note that this radio field strength reduction information includes information on the MAC address of the wireless LAN terminal device 2 whose radio field strength has been reduced.

  The position calculation device 4 that has received the radio field intensity reduction information refers to the area characteristic information storage unit 45 and checks whether or not the position of the wireless LAN terminal device 2 (the latest position) is on the deck. Then, if the immediate position of the wireless LAN terminal device 2 is on the deck, it is determined that there is a high possibility that the sailor (detection target person 100) has fallen, and the display device 5 is appropriately set as described above. Display a warning. On the other hand, if the most recent position of the wireless LAN terminal device 2 is other than on the deck, it is determined that there is a high possibility that the radio LAN terminal device 2 has run out of battery, or the radio wave has just been interrupted due to leaving the area. The above warning is not displayed. This can reduce false alarms. The determination as to whether or not the sailor's immediate position was on the deck was made to store the coordinates of the rectangular area representing the deck in the area characteristic information storage unit 45 in advance, as in the determination of the off-limit area. This can be done by comparing with the coordinates of the most recent position of the wireless LAN terminal device 2.

  Next, an operation when a fire occurs in the ship and the fire detection sensor 9 detects it will be described. When the fire detection sensor 9 detects a fire, the fire place acquisition device 10 connected to the fire detection sensor 9 transmits information including the position of the fire detection sensor 9 to the position calculation device 4. The position calculation device 4 creates abnormality information and transmits it to the display device 5 together with information on the position of the fire detection sensor 9. In the display device 5, the position of the fire detection sensor 9 that detects the fire (that is, the fire occurrence position) is displayed on the map 111 together with the position of each sailor (human figure 112).

  As a result, it is possible to immediately grasp the fire location when a fire is detected. Also, by delivering a fire occurrence message to the sailor's wireless LAN terminal device 2 located in the vicinity of the fire source, a quick fire extinguishing and evacuation activity can be performed. Further, when the carbon dioxide gas fire extinguishing is performed with the compartment sealed, it is necessary to confirm that there is no personnel inside (because the operation of the carbon dioxide fire extinguishing device is related to human life). The terminal position detection system 1 can be one of the judgment materials. In this case, since it is possible to quickly confirm on the display device 5 that a person has been evacuated from the section, early fire extinguishing is possible.

  The terminal position detection system 1 described above can also be used for the purpose of grasping whether a sailor is on board or disembarking while the ship is berthing. That is, when a wireless frame from the wireless LAN terminal device 2 carried by a certain sailor is detected by the repeater 3, it can be determined that the sailor is on board, otherwise it is aboard. . Further, by determining the direction of movement of the sailor who passes through the gate 202 by using the position calculation device 4, it is possible to detect the sailor's boarding and unloading. When a sailor's boarding or disembarking is detected, that fact may be displayed on the display device 5. As described above, for example, it is possible to avoid leaving the port while an occupant leaves the ship.

  In addition, the terminal position detection system 1 can detect, for example, that a person other than the related person tries to board or disembark through the gate 202 even though the wireless LAN terminal device 2 is not carried. That is, the position calculation device 4 has the wireless LAN terminal device 2 in a predetermined area set in the vicinity of the gate passage detection device 11 even though the infrared sensor 12 of the gate passage detection device 11 detects passage of a person. If it is determined that the terminal does not exist, terminal non-carried person detection information is created. When receiving the terminal non-carried person detection information, the display device 5 appropriately displays that an abnormality has occurred. Therefore, the user can grasp and prepare early that someone unexpectedly passed the gate 202. At this time, the unaccompanied person at the time of passing through the gate is photographed by the camera 13, and the image is distributed to each wireless LAN terminal device 2, so that the sailor can obtain in advance very useful information such as the state of the suspicious person. It is possible to respond more accurately.

  However, for example, if a sailor happens to rest near the gate 202 and the sailor's wireless LAN terminal device 2 is detected, the suspicious person's passage through the gate 202 may not be detected properly. It is done. In order to prevent this, it is effective to use the history of the position of the wireless LAN terminal device 2. That is, for example, even when the wireless LAN terminal device 2 is detected in the vicinity of the gate passage detection device 11, if the wireless LAN terminal device 2 is stationary for a certain time or longer, the wireless LAN terminal device 2 is not connected to the gate passer's wireless LAN. It can be determined that it is not the terminal device 2. In addition, when the wireless LAN terminal device 2 is not detected in the vicinity of the gate passage detection device 11 and the infrared sensor 12 of the gate passage detection device 11 detects the passage of a person, the above-mentioned terminal non-portable Person detection information may be created.

  Further, when the wireless LAN terminal device 2 that has actually passed through the gate 202 is not detected by tracking the change in position of each wireless LAN terminal device 2, the person detected by the infrared sensor 12 is the wireless LAN terminal. The terminal non-portable person detection information can also be created as a non-portable person of the device 2. Furthermore, after the repeater 3 is arranged at substantially the same position as the gate passage detection device 11 (for example, a position directly facing the passage of the gate 202), the repeater 3 detects, for example, a reception state at substantially the highest level. If not, it can be configured that the person who passes through the gate is the person who is not carrying the wireless LAN terminal device 2 and the terminal non-person carrying person detection information is created.

  Although the suspicious person who passes through the gate 202 can be detected as described above, even a person who carries the wireless LAN terminal device 2 can pass through if, for example, a plurality of gates 202 are installed. Can be limited for each gate 202. In this case, for example, the following configuration is conceivable. That is, after the passage permission condition is determined in advance for each gate 202, the position calculation device 4 is detected by the wireless LAN terminal device 2 detected in the vicinity of the gate passage detection device 11 (that is, the person who has passed through the gate 202). Based on the MAC address of the wireless LAN terminal device 2), it is determined whether or not the person carrying the wireless LAN terminal device 2 can pass through the gate 202. As an example of the passage permission condition, a list of MAC addresses of the wireless LAN terminal device 2 related to those who can pass is considered. If there is a person who has passed through the gate 202 even though passage is prohibited, the position calculation device 4 creates information (pass-permitted person detection information) to that effect. And the display apparatus 5 displays abnormality information suitably based on this passage-permitted person detection information. As described above, the entry / exit of personnel can be appropriately managed for each of the plurality of gates 202.

  In the above configuration, the reception status information is created by the relay unit 3 wirelessly transmitting and receiving data to and from the wireless LAN terminal device 2. However, the relay unit 3 wirelessly transmits and receives data to and from the relay unit 3 and relay. It is also possible to create reception status information between the machines 3 (hereinafter referred to as inter-relay reception status information). The contents of the inter-relay reception state information are substantially the same as the reception state information related to the reception of the wireless frame from the wireless LAN terminal device 2 described above.

  The repeater 3 receives and analyzes the radio frame transmitted from the other repeater 3, thereby creating the above-described inter-relay reception state information and transmitting it to the position calculation device 4. The creation and transmission of the inter-relay reception state information is repeatedly performed at predetermined time intervals.

  The position calculation device 4 monitors changes in the content of the inter-relay reception state information received every moment. If the content of the inter-relay reception state information has changed from the past and the amount of change is larger than a predetermined value (that is, if the performance of the repeater 3 has changed rapidly), an abnormality has occurred in the repeater 3. Abnormal information to the effect is created and transmitted to the display device 5 side. Thereby, a so-called self-diagnosis function is realized, and the user can quickly recognize the occurrence of the abnormality of the relay device 3 by the display of the display device 5.

  In addition, regarding the repeater 3 that is determined to have an abnormality in the self-diagnosis function, even if the repeater 3 creates the reception status information as usual, the wireless LAN terminal trusts the contents completely. The position of the device 2 cannot be estimated. Therefore, the position calculation device 4 uses other values than the difference when the reception status information created by the relay device 3 related to the abnormality is compared with the registered reception status information in the calculation of the matching distance by the matching distance calculation unit 46a. The difference when the reception status information created by the (normal) repeater 3 is compared with the registered reception status information is focused on. As a result, even when an abnormality occurs in some of the repeaters 3, it is possible to ensure a certain degree of accuracy in position estimation.

  As described above, the terminal position detection system 1 according to the present embodiment includes the plurality of relay units 3, the position calculation device 4, and the display device 5. When each relay device 3 receives a wireless frame transmitted including the MAC address of the wireless LAN terminal device 2 from the wireless LAN terminal device 2 moving together with the detection target person 100, the reception state information regarding the reception state Create The position calculation device 4 estimates the position of each wireless LAN terminal device 2 by calculation based on the reception state information acquired from the repeater 3. The display device 5 displays the position estimated by the position calculation device 4. The position calculation device 4 includes a point selection unit 46b and an error determination unit 46c. The point selection unit 46b estimates the position of the wireless LAN terminal device 2 based on the reception state information. The error determination unit 46c is estimated when the current position of the wireless LAN terminal device 2 estimated by the point selection unit 46b satisfies a predetermined relationship with the past position of the wireless LAN terminal device 2. Is determined to be incorrect. The display device 5 can display the position estimated by the position calculation device 4 except for the position determined as an error by the error determination unit 46c.

  Thereby, when the position estimated by the point selection unit 46b is in a positional relationship such that the position is unnaturally moved from the past position, the position can be determined as an error and excluded from the display on the display device 5. . Therefore, the position display behavior in the display device 5 can be prevented from becoming unstable, and a highly reliable terminal position detection system can be provided.

  Further, in the present embodiment, the error determination unit 46c is such that the current position of the wireless LAN terminal device 2 obtained by the point selection unit 46b is outside a predetermined area including the position closest to the wireless LAN terminal device 2. If it is determined as an error.

  Thereby, since the behavior that the position display in the display device 5 moves discontinuously can be prevented, stable and natural display can be realized.

  Further, in the present embodiment, the error determination unit 46c determines the predetermined area in consideration of a change in position up to the nearest point of the wireless LAN terminal device 2.

  Accordingly, it is possible to accurately determine whether or not the estimated position is an error in consideration of the moving direction, moving speed, and the like up to the detection target person 100 carrying the wireless LAN terminal device 2.

  In the present embodiment, the repeater 3 detects the reception strength at the time of reception of the wireless frame from the wireless LAN terminal device 2 and acquires the MAC address of the wireless LAN terminal device 2 from the wireless frame. Then, the relay device 3 creates reception state information so as to include the reception strength and the MAC address.

  Thereby, since the position estimation of the wireless LAN terminal device 2 is performed using the reception intensity that varies greatly depending on the positional relationship between the relay device 3 and the wireless LAN terminal device 2, it is possible to realize good estimation accuracy. In addition, since the MAC status uniquely assigned to the wireless LAN terminal device 2 is included in the reception state information, it is possible to easily identify each of the plurality of wireless LAN terminal devices 2 and estimate its position. Can do.

  In addition, the reception status information created by the repeater 3 in the present embodiment includes a communication speed, a modulation method, and an error level when a radio frame is received.

  Thereby, even if the number of relay units 3 is small, the position of the wireless LAN terminal device 2 can be estimated with good accuracy using various parameters included in the reception state information.

  Further, the position calculation device 4 of the present embodiment includes a registration point reception state information storage unit 43. In the registration point reception state information storage unit 43, when the wireless LAN terminal device 2 arranged at the plurality of positions (points A to J in FIG. 6) and the point transmits the wireless frame, The reception status information created by each relay device 3 that has received the radio frame can be stored in advance in association with each other. When the position calculation device 4 receives the reception state information from the repeater 3, the position calculation device 4 compares the reception state information with the registered reception state information that is the reception state information stored in the registration point reception state information storage unit 43. To do. Then, the point selection unit 46 b performs a selection estimation process for estimating that the point corresponding to the registered reception state information determined to be closest to the reception state information is the current position of the wireless LAN terminal device 2.

  Thereby, the position of the wireless LAN terminal device 2 can be estimated with good accuracy even in an environment where radio waves are easily reflected in a complicated manner, such as a structure with a complicated floor plan.

  In the present embodiment, when receiving a wireless frame from the wireless LAN terminal device 2, the repeater 3 detects the reception strength, creates reception state information including the reception strength, and sends it to the position calculation device 4. Configured to send. On the other hand, when receiving the reception status information from the repeater 3, the position calculation device 4 calculates an average value for a plurality of reception status information received at present and in the past, at least for the reception intensity. And the position calculating apparatus 4 uses the said average value as reception intensity in the said reception status information, when receiving intensity is compared between reception status information and the said registration reception status information.

  Thereby, since it is possible to compare with the registered reception state information in a state where the variation in reception intensity in the reception state is removed in advance, more reliable position estimation can be realized.

  Further, in the present embodiment, when the position calculation device 4 calculates the average value of the reception intensity from a plurality of reception state information, the reception state information having the reception intensity outside the predetermined range is the target for calculating the average value. It is supposed to be excluded from.

  As a result, it is possible to exclude extreme reception state information that can be clearly seen as noise, so that it is possible to realize more reliable position estimation.

  Further, in the present embodiment, the position calculation device 4 performs calculation for interpolating between the plurality of registered reception status information stored in the registered location reception status information storage unit 43, thereby performing the registration location reception status information storage unit 43. It is possible to estimate reception state information at a point not stored in the information and to additionally store it in the registered point reception state information storage unit 43.

  As a result, the number of points where the wireless LAN terminal device 2 must actually be taken to the location can be reduced before the system is operated, so that the work load can be reduced.

  Further, in the present embodiment, when the position calculation device 4 tries to store the new location and the reception status information in the registration location reception status information storage unit 43 in association with each other, the location calculation device 4 stores the registered reception status information already stored. If the degree of divergence between any of the new reception status information is smaller than a predetermined value and the distance between the point corresponding to the registered reception status information and the new location is larger than the predetermined distance, registration warning information is created .

  As a result, it becomes clear at an early stage before the system operation that the reception status information is similar to each other and is confusing, so that measures such as addition of the repeater 3 or layout change can be quickly examined.

  In the present embodiment, the position calculation device 4 estimates or confirms that the wireless LAN terminal device 2 is located at the point stored in the registered point reception state information storage unit 43 by a method other than the selection estimation process. In such a case, the reception status information created by the repeater 3 based on the radio frame transmitted by the wireless LAN terminal device 2 and the registered reception status corresponding to the location in the content of the registration location reception status information storage unit 43 Update information.

  As a result, the registered reception status information can be appropriately updated as necessary. For example, it is possible to cope with a temporal change in transmission output of the wireless LAN terminal device 2, a temporal change in reception sensitivity of the repeater 3, and the like. . As a result, position estimation can be performed with good accuracy over a long period of time.

  In the present embodiment, the position calculation device 4 evaluates the degree of approximation between the reception state information received from the repeater 3 and the registered reception state information determined to be closest to the reception state information. Create information.

  Thereby, since the position estimation situation of the wireless LAN terminal device 2 can be properly grasped using the position accuracy information, the user can make an accurate determination according to the situation.

  In the present embodiment, when receiving the reception state information from the repeater 3, the position calculation device 4 calculates an average value for a plurality of reception state information received at present and in the past for at least the reception intensity. The number of reception status information used for calculating the average value of the reception intensity varies based on the position accuracy information.

  As a result, when the position accuracy is not good, stable position estimation accuracy can be realized by increasing the number of reception state information to be averaged. On the other hand, when the position accuracy is good, it is possible to perform position display with an emphasis on real-time characteristics by reducing the number of reception state information to be subjected to average value calculation.

  In the present embodiment, the display device 5 displays the position estimated by the position calculation device 4 and also displays a circle 113 whose size changes according to the position accuracy information.

  Thereby, since the accuracy of the current position estimation can be easily confirmed by looking at the display device 5, the situation can be grasped more comprehensively.

  In the present embodiment, the display device 5 displays the position estimated by the position calculation device 4 so as to overlap the map 111 in the ship.

  As a result, the position of the detection target person 100 in the ship can be understood more quickly and accurately.

  Moreover, in the terminal position detection system 1 of this embodiment, when the fire detection sensor 9 detects a fire, the position of the fire detection sensor 9 is displayed on the display device 5 so as to overlap the map 111.

  Thereby, since the fire occurrence position can be grasped instantaneously in relation to the detection target person 100, a quick emergency response becomes possible. In addition, since the fire occurrence position, the map 111, and the position of the person to be detected 100 can be displayed on one display device 5, the information can be easily grasped and the display device 5 can be made compact.

  Further, in the present embodiment, the repeater 3 receives a radio frame transmitted by another repeater 3, and receives the MAC address of the repeater 3 that is the transmission source of the radio frame, information on the reception strength of the radio frame, and The inter-relay reception state information including can be created.

  Thus, by transmitting and receiving between the repeaters 3 and acquiring the reception state thereof, it becomes a reference when managing the position estimation accuracy of the position calculation device 4 and maintenance work such as a change in reception sensitivity of the repeater 3 over time. Useful information can be obtained.

  Further, in the present embodiment, the position calculation device 4 is configured to repeatedly acquire the reception status information between the relay devices from each relay device 3. If the current inter-relay reception state information changes from the latest inter-relay reception state information and the amount of change is greater than a predetermined value, the position calculation device 4 indicates that an abnormality has occurred in the repeater 3. Create information.

  Thereby, since the abnormality of the repeater 3 can be detected early by self-diagnosis, the position estimation accuracy by the position calculation device 4 can be favorably maintained over a long period of time.

  Further, in the present embodiment, the matching distance calculation unit 46a of the position calculation device 4 relates to the other repeaters 3 rather than the difference between the reception state information related to the repeater 3 in which the occurrence of the abnormality is detected and the registered reception state information. A matching distance is calculated in consideration of the difference between the reception status information and the registered reception status information. Then, the location selection unit 46b determines the location corresponding to the registered reception status information determined to be closest to the reception status information acquired from the repeater 3 based on the matching distance at the current location of the wireless LAN terminal device 2. Presume that there is.

  As a result, it is possible to flexibly cope with a case where an abnormality occurs in a specific relay 3 and the reliability is lowered, and an accurate position estimation can be realized.

  Further, in the terminal position detection system 1 of the present embodiment, when the repeater 3 detects that the radio field intensity of the wireless frame from the wireless LAN terminal device 2 has dropped below a predetermined value within a predetermined time, Radio wave intensity reduction information including the MAC address of the wireless LAN terminal device 2 is created and transmitted to the position calculation device 4. Then, the position calculation device 4 creates drop detection information when receiving the radio field strength reduction information when the estimated position of the wireless LAN terminal device 2 is in a predetermined drop risk area (for example, a deck). Further, the display device 5 displays an abnormality occurrence based on the fall detection information.

  Thereby, since the water fall from the ship of the detection subject person 100 can be quickly detected and displayed on the display device 5, it is possible to promptly perform a treatment such as instructing a nearby person to rush to the site. In addition, when the wireless LAN terminal device 2 is in an area where there is no risk of water falling, even if a sharp decrease in radio field intensity is detected, no abnormality occurrence display is performed, so that frequent false alarms can be prevented.

  In addition, instead of the relay unit 3 detecting the decrease in the radio field intensity and transmitting the radio field intensity decrease information as described above, the following configuration may be employed. That is, when the acceleration sensor 27 of the wireless LAN terminal device 2 detects the fall of the own device, the fall detection signal is transmitted to the relay device 3, and the relay device 3 transmits the received fall detection signal to the position calculation device 4. To do. At this time, the repeater 3 transmits the MAC address of the wireless LAN terminal device 2 that transmitted the fall detection signal together with the position calculation device 4. When the position calculation device 4 receives a drop detection signal when the estimated position of the wireless LAN terminal device 2 is in a predetermined drop risk area (for example, a deck), the position calculation device 4 creates drop detection information.

  Thereby, the falling water from the ship of the detection subject person 100 can be quickly detected and displayed on the display device 5. Moreover, since the fall of the own apparatus is directly detected by the acceleration sensor 27, the falling water can be accurately detected. Furthermore, when there is a wireless LAN terminal device 2 in an area where there is no danger of falling from such a high place (an area other than the deck), even if a fall detection signal is received, an abnormality occurrence display is not performed. The occurrence of false alarms can be prevented.

  Further, in this embodiment, when the wireless LAN terminal device 2 detects a long-time fall of its own device (specifically, the acceleration sensor 27 continuously detects a state close to weightlessness for a predetermined time or more, and immediately after that, When a large acceleration is detected), a fall detection signal is transmitted to the repeater 3. The display device 5 performs an abnormality occurrence display based on the fall detection signal.

  Thereby, since it is possible to quickly detect and display on the display device 5 a long-time fall (including water falling from the ship) of the detection target person 100, it is possible to promptly take measures such as instructing a nearby person to rush to the site. It can be carried out.

  In the present embodiment, the wireless LAN terminal device 2 is configured to transmit a submergence signal to the relay unit 3 when the water detection sensor 26 detects submergence of the own device. The display device 5 performs an abnormality occurrence display based on the submergence signal.

  Thereby, since the submergence of the wireless LAN terminal device 2 (including water falling from the ship) can be quickly detected and displayed on the display device 5, it is possible to promptly take measures such as instructing a nearby person to rush to the site. Can do.

  In addition, the terminal position detection system 1 of the present embodiment includes a GPS device 7 and an ocean current information acquisition device 8. The GPS device 7 acquires the position of the ship 201. The ocean current information acquisition device 8 acquires ocean current information around the ship 201. When the abnormality occurrence display is performed, the display device 5 also displays information on the position of the ship 201 and the surrounding ocean current when the abnormality occurs.

  Thereby, when the detection target person 100 (for example, a crew member) falls from the ship 201, the occurrence of an abnormality is notified and useful information for rescue is automatically displayed on the display device 5. Can be done quickly.

  The terminal position detection system 1 according to the present embodiment includes a gate passage detection device 11 that can detect a human body. This gate passage detection device 11 is arranged in a gate 202 which is a boundary portion of a predetermined management region (a region where the position calculation device 4 is set within a region where the position of the wireless LAN terminal device 2 can be estimated). The position calculation device 4 creates terminal non-carried person detection information when the gate passage detection device 11 detects a human body even though the wireless LAN terminal device 2 does not exist in the vicinity of the gate passage detection device 11. The display device 5 performs abnormality occurrence display based on the terminal non-carried person detection information.

  Thereby, a suspicious person's boarding etc. can be detected quickly and an appropriate response | compatibility can be performed.

  In the terminal position detection system 1 according to the present embodiment, the position calculation device 4 is configured such that the wireless LAN terminal device 2 does not exist in the vicinity of the gate passage detection device 11 or exists in the vicinity of the gate passage detection device 11. Even when all of the terminal devices 2 are stationary for a certain period of time or more, when the gate passage detection device 11 detects a human body, it may be configured to create terminal non-carried person detection information.

  That is, when all the wireless LAN terminal devices 2 detected in the vicinity of the gate passage detection device 11 are stationary when the gate passage detection device 11 detects a human body, the sailor who is going to pass through the gate 202 is It is thought that there is not. Therefore, at this time, by generating the terminal non-portable person detection information, it is possible to accurately detect and display abnormally the terminal non-portable person passing through the gate.

  In the terminal position detection system 1 of the present embodiment, the position calculation device 4 is not detected by the wireless LAN terminal device 2 that passes through the boundary of the management area at the location where the gate passage detection device 11 is arranged. When the gate passage detection device 11 detects a human body, it can be configured to create terminal non-carried person detection information.

  Thereby, when the gate passage detection device 11 detects a human body, the terminal non-portable person except when the wireless LAN terminal device 2 passing through the boundary of the management area is detected at the arrangement location of the gate passage detection device 11 Is determined to have passed through the gate 202. Therefore, it is possible to accurately detect the passage of the terminal non-carried person through the gate and display the abnormality.

  Further, in the terminal position detection system 1 of the present embodiment, when one of the plurality of repeaters 3 is arranged in the vicinity of the gate passage detection device 11, the following can be performed. That is, even though the reception state information acquired from the repeater 3 arranged in the vicinity of the gate passage detection device 11 does not satisfy a predetermined condition (specifically, the reception state is almost the best level). When the gate passage detection device 11 detects a human body, the position calculation device 4 creates terminal non-carried person detection information.

  Thereby, when the gate passage detection device 11 detects a human body, the terminal 3 is not portable unless the repeater 3 in the vicinity of the gate passage detection device 11 receives the wireless frame from the wireless LAN terminal device 2 very well. It is determined that the person has passed through the gate 202. Therefore, through simple control, it is possible to accurately detect and display abnormally the passage of the terminal non-portable person through the gate.

  Moreover, the terminal position detection system 1 of this embodiment can also be comprised as follows, when the said gate 202 (gate passage detection apparatus 11) is multiply arranged. That is, the position calculation device 4 satisfies the passage permission condition in which the identification information of the wireless LAN terminal device 2 detected in the vicinity of the gate passage detection device 11 is determined according to each gate 202 (gate passage detection device 11). If it does not satisfy the condition, pass-permitted person detection information is created. The display device 5 performs abnormality occurrence display based on the passage-permitted person detection information.

  Thereby, the person who can pass the gate 202 and the person who cannot pass can be managed for each gate 202 (for each gate passage detection device 11). When a person who cannot pass through the gate 202, an abnormality can be appropriately displayed.

  In addition, the terminal position detection system 1 of the present embodiment includes a camera 13 that can photograph the human body in conjunction with the gate passage detection device 11 detecting the human body. The terminal position detection system 1 can distribute an image captured by the camera 13 to the wireless LAN terminal device 2 when an abnormality occurs.

  Thereby, it is possible to prompt the crew member as the detection subject 100 to take a more appropriate response by quickly disseminating the information of the suspicious person.

  In the present embodiment, the position calculation device 4 creates prohibited area entry detection information when the estimated position of the wireless LAN terminal device 2 is within a predetermined prohibited area (for example, the restricted entry area). The display device 5 displays an abnormality occurrence based on the prohibited area entry detection information.

  As a result, it is possible to quickly detect the entry of a crew member or the like into the prohibited area and take an appropriate action.

  In the present embodiment, the wireless LAN terminal device 2 includes a display 23. Then, when an abnormality occurs, the terminal position detection system 1 distributes information on the content of the abnormality to the wireless LAN terminal device 2 and causes the display 23 to display the information.

  Thereby, by distributing the content of the abnormality that has occurred to the detection target person 100, a large number of persons in the ship can quickly start appropriate actions such as rescue and evacuation.

  Further, the terminal position detection system 1 of the present embodiment is configured such that, when an abnormality occurs, the wireless LAN terminal device 2 whose position estimated by the position calculation device 4 is close to the abnormality occurrence point, and the wireless LAN terminal device 2 that is not so, Are configured to be able to distribute different information.

  In this way, for example, in the event of a fire, the crew nearest to the fire source is instructed to take emergency measures such as removing flammable substances near the fire source, and In preparation for extinguishing the carbon dioxide gas, it is possible to take appropriate measures according to the positional relationship with respect to the location where the abnormality has occurred, such as instructing that the area should be evacuated immediately.

  Moreover, in the terminal position detection system 1 of this embodiment, the relay machine 3 is installed in both the floors adjacent to an up-down direction in the building of several floors. The upper floor repeater 3 is arranged so as not to correspond to the lower floor repeater 3 in the vertical direction.

  Thereby, for example, when the wireless LAN terminal device 2 is located on the upper floor, the position of the wireless LAN terminal device 2 can be efficiently utilized by utilizing not only the upper floor but also the lower floor repeater 3. Can be estimated. In particular, since the lower floor repeater 3 is in a position that does not correspond to the upper floor repeater 3 in the vertical direction, the reception status of the lower floor repeater 3 is set to the upper side of the wireless LAN terminal device 2. It can be used as a powerful basis for estimating the position on the floor (position in the plane direction). Therefore, even when the number of relay units 3 is smaller (for example, two per floor), the position of the wireless LAN terminal device 2 can be estimated with almost no problem. Therefore, the installation cost of the system can be reduced and the wiring is simplified.

  Moreover, in this embodiment, while installing the terminal position detection system 1 in a ship, a crew member position management system is constructed | assembled by making a crew member carry the wireless LAN terminal device 2. FIG.

  Accordingly, it is possible to provide a sailor position management system that can accurately estimate the position of a sailor via the wireless LAN terminal device 2.

  Although the preferred embodiment of the present invention has been described above, the above-described configuration can be changed as follows, for example.

  In the above embodiment, the reception state information is configured to include the modulation method, communication speed, radio wave intensity, and error level, but any one to three of them can be omitted. The calculation of the error level is not limited to the above method, and can be determined as appropriate.

  The shape of the allowable region Q used in the error determination unit 46c is not limited to a circle, but can be changed to any other shape.

  In the above embodiment, the gate passage detection device 11 is configured to detect the human body with the infrared sensor 12, but can be changed to detect the human body with the motion sensor of the camera 13 instead.

  As the wireless LAN terminal device 2, a general-purpose mobile phone with a wireless LAN function can be used.

  The terminal position detection system of the present invention is not limited to use on a ship, and is applied to detect or manage the position of a person as a moving body in various facilities such as hospitals, schools, nursing homes, etc. Can do.

DESCRIPTION OF SYMBOLS 1 Terminal position detection system 2 Wireless LAN terminal device 3 Relay machine 4 Position calculation apparatus 5 Display apparatus 46b Point selection part (position estimation part)
46c Error determination unit 100 Person to be detected (moving object)

Claims (32)

  1. A plurality of relays for receiving a wireless frame transmitted including identification information of the wireless LAN terminal device from the wireless LAN terminal device moving together with the mobile body, and creating reception state information regarding the reception state;
    Based on the reception status information acquired from the relay, a position calculation device that estimates the position of each wireless LAN terminal device by calculation;
    A display device for displaying the position estimated by the position calculation device;
    With
    The position calculation device includes:
    A position estimation unit that estimates the position of the wireless LAN terminal device based on the reception state information;
    When the current position of the wireless LAN terminal device estimated by the position estimation unit satisfies a predetermined relationship with the past position of the wireless LAN terminal device, the estimated position is determined as an error. An error determination unit;
    With
    The repeater is
    While detecting the reception strength at the time of reception of the wireless frame from the wireless LAN terminal device, the identification information of the wireless LAN terminal device is acquired from the wireless frame,
    Including the reception strength and the identification information, and further creating the reception state information so as to include at least one of a communication speed, a modulation method, and a communication error evaluation value at the time of reception of the radio frame,
    The position calculation device includes a registration point reception state information storage unit,
    In the registration point reception state information storage unit,
    The location of multiple points,
    When the wireless LAN terminal device arranged at the point transmits the wireless frame, reception status information created by each of the relays that has received the wireless frame;
    Can be stored in advance,
    When the position calculation device receives reception state information from the repeater, the position calculation device compares the reception state information with registered reception state information that is reception state information stored in the registration point reception state information storage unit. Then, in addition to the difference in reception strength, by calculating the degree of divergence including the evaluation of at least one of the communication speed, modulation method and communication error evaluation value at the time of reception of the radio frame, A selection estimation process is performed to estimate a point corresponding to the determined registered reception state information as the current position of the wireless LAN terminal device,
    The terminal position detection system characterized in that the display device can display the position estimated by the position calculation device, except for the position determined to be an error by the error determination unit.
  2. The terminal position detection system according to claim 1,
    The error determination unit determines an error when the current position of the wireless LAN terminal device obtained by the position estimation unit is outside a predetermined area including a position nearest to the wireless LAN terminal device. A terminal position detection system characterized by.
  3. The terminal position detection system according to claim 2,
    The terminal determination system according to claim 1, wherein the error determination unit determines the predetermined area in consideration of a position change up to the nearest point of the wireless LAN terminal device.
  4. The terminal position detection system according to any one of claims 1 to 3,
    When the wireless frame is received from the wireless LAN terminal device, the repeater detects the reception strength, creates reception state information including the reception strength, and transmits the reception state information to the position calculation device. Has been
    The position calculation device, when receiving the reception status information from the repeater, at least for the reception intensity, calculates an average value for a plurality of reception status information received at present and in the past,
    The terminal position detection system characterized by using the average value as the reception strength in the reception status information when comparing the reception strengths between the reception status information and the registered reception status information.
  5. The terminal position detection system according to claim 4,
    When calculating the average value of the reception strength from a plurality of reception status information, the position calculation device excludes reception status information having a reception strength outside a predetermined range from the target for calculating the average value. A terminal position detection system characterized by.
  6. The terminal position detection system according to any one of claims 1 to 5,
    The position calculation device performs a calculation for interpolating between a plurality of registered reception status information stored in the registered location reception status information storage unit, so that the location calculation device at a location not stored in the registration location reception status information storage unit. A terminal position detection system capable of estimating reception state information and additionally storing it in the registration point reception state information storage unit.
  7. The terminal position detection system according to any one of claims 1 to 6,
    In the case of trying to store the new location and the reception status information in the registered location reception status information storage unit, the position calculation device,
    The degree of divergence between any of the registered reception status information already stored and the new reception status information is smaller than a predetermined value, and the distance between the point corresponding to the registered reception status information and the new location is a predetermined distance. When it is larger, a terminal position detection system that creates registration warning information.
  8. The terminal position detection system according to any one of claims 1 to 7,
    When the position calculation device estimates or confirms that the wireless LAN terminal device is located at a point stored in the registration point reception state information storage unit by a method other than the selection estimation process, The registration reception status information corresponding to the point is updated in the contents of the registration point reception state information storage unit with the reception state information created by the repeater based on the radio frame transmitted by the wireless LAN terminal device. A terminal position detection system.
  9. The terminal position detection system according to any one of claims 1 to 8,
    The position calculation device creates position accuracy information that evaluates a degree of approximation between the reception state information received from the repeater and the registered reception state information determined to be closest to the reception state information. A terminal position detection system that is characterized.
  10. The terminal position detection system according to claim 9,
    When the wireless frame is received from the wireless LAN terminal device, the repeater detects the reception strength, creates reception state information including the reception strength, and transmits the reception state information to the position calculation device. Has been
    The position calculation device, when receiving the reception status information from the repeater, at least for the reception intensity, calculates an average value for a plurality of reception status information received at present and in the past,
    The number of reception state information used for calculating the average value of the reception intensity varies based on the position accuracy information.
  11. The terminal position detection system according to claim 9 or 10,
    The display device displays a position estimated by the position calculation device and performs a visual display that changes in accordance with the position accuracy information.
  12. The terminal position detection system according to any one of claims 1 to 11,
    The terminal position detection system, wherein the display device displays the position estimated by the position calculation device so as to be superimposed on a map indicating a region where position management of the wireless LAN terminal device is performed.
  13. The terminal position detection system according to claim 12,
    Equipped with a fire detection sensor,
    When the fire detection sensor detects a fire, the terminal position detection system displays the position of the fire detection sensor on the display device so as to overlap the map.
  14. The terminal position detection system according to any one of claims 1 to 13,
    The repeater receives a radio frame transmitted from another repeater, and receives inter-relay reception including identification information of a repeater that is a transmission source of the radio frame and information on the reception strength of the radio frame. A terminal position detection system configured to be able to create state information.
  15. The terminal position detection system according to claim 14,
    The position calculation device is configured to repeatedly acquire the inter-relay reception state information from each of the repeaters,
    If the current inter-repeater reception status information changes from the latest inter-repeater reception status information, and the amount of change is greater than a predetermined value, abnormal information indicating that an error has occurred in the repeater is created. Terminal position detection system.
  16. The terminal position detection system according to claim 15,
    In determining the registered reception status information closest to the reception status information, the reception status information and registration related to the other relay devices are registered rather than the difference between the reception status information related to the relay device in which the occurrence of the abnormality is detected and the registered reception status information. A terminal position detection system characterized by focusing on a difference in reception status information.
  17. The terminal position detection system according to any one of claims 1 to 16,
    If the relay station detects that the radio field intensity of the radio frame from the wireless LAN terminal apparatus has dropped below a predetermined value within a predetermined time, the radio field intensity decrease including the identification information of the wireless LAN terminal apparatus It is configured to create and send information to the position calculation device,
    When the position calculation device receives the radio field strength reduction information when the estimated position of the wireless LAN terminal device is in a predetermined drop risk area, it creates fall detection information,
    The terminal position detection system, wherein the display device displays an abnormality occurrence based on the fall detection information.
  18. The terminal position detection system according to any one of claims 1 to 17,
    The wireless LAN terminal device includes an acceleration sensor capable of detecting the fall of the own device, and is configured to transmit a fall detection signal to the relay device when the acceleration sensor detects the fall of the own device.
    When the position calculation device receives the fall detection signal when the estimated position of the wireless LAN terminal device is in a predetermined fall risk area, it creates fall detection information,
    The terminal position detection system, wherein the display device displays an abnormality occurrence based on the fall detection information.
  19. The terminal position detection system according to any one of claims 1 to 17,
    The wireless LAN terminal device is configured to transmit a fall detection signal to the repeater when detecting a long fall of the own device,
    The terminal position detection system, wherein the display device displays an abnormality occurrence based on the fall detection signal.
  20. The terminal position detection system according to any one of claims 1 to 17,
    The wireless LAN terminal device is configured to transmit a submergence signal to the repeater when detecting the submergence of its own device,
    The terminal position detection system, wherein the display device displays an abnormality occurrence based on the submergence signal.
  21. The terminal position detection system according to any one of claims 17 to 20,
    A ship position acquisition device for acquiring the position of the ship in which the terminal position detection system is installed;
    An ocean current information acquisition device for acquiring ocean current information around the ship;
    With
    The said display apparatus displays the information of the position of the said ship at the time of abnormality occurrence, and the surrounding ocean current together, when performing the said abnormality occurrence display.
  22. The terminal position detection system according to any one of claims 1 to 21,
    A human body detection device capable of detecting a human body,
    The human body detection device is arranged at a boundary portion of a predetermined management area set in an area where the position calculation device can estimate the position of the wireless LAN terminal device,
    If the human body detection device detects a human body even though the wireless LAN terminal device does not exist in the vicinity of the human body detection device, the position calculation device creates terminal non-carried person detection information,
    The terminal position detection system, wherein the display device displays an abnormality occurrence based on the terminal non-carried person detection information.
  23. The terminal position detection system according to any one of claims 1 to 21,
    A human body detection device capable of detecting a human body,
    The human body detection device is arranged at a boundary portion of a predetermined management area set in an area where the position calculation device can estimate the position of the wireless LAN terminal device,
    The position calculation device has the wireless LAN terminal device in the vicinity of the human body detecting device or the wireless LAN terminal device in the vicinity of the human body detecting device is stationary for a certain time or more. First, when the human body detection device detects a human body, it creates terminal non-carried person detection information,
    The terminal position detection system, wherein the display device displays an abnormality occurrence based on the terminal non-carried person detection information.
  24. The terminal position detection system according to any one of claims 1 to 21,
    A human body detection device capable of detecting a human body,
    The human body detection device is arranged at a boundary portion of a predetermined management area set in an area where the position calculation device can estimate the position of the wireless LAN terminal device,
    When the human body detection device detects a human body even though the wireless LAN terminal device passing through the boundary of the management area is not detected at the location of the human body detection device, the position calculation device Person detection information
    The terminal position detection system, wherein the display device displays an abnormality occurrence based on the terminal non-carried person detection information.
  25. The terminal position detection system according to any one of claims 1 to 21,
    A human body detection device capable of detecting a human body,
    The human body detection device is arranged at a boundary portion of a predetermined management area set in an area where the position calculation device can estimate the position of the wireless LAN terminal device,
    At least one of the repeaters is disposed in the vicinity of a human body detection region by the human body detection device,
    The position calculation device is a terminal when the human body detection device detects a human body even though the reception state information acquired from a repeater arranged in the vicinity of the human body detection region does not satisfy a predetermined condition. Create non-portable person detection information,
    The terminal position detection system, wherein the display device displays an abnormality occurrence based on the terminal non-carried person detection information.
  26. The terminal position detection system according to any one of claims 22 to 25, wherein:
    A plurality of the human body detection devices are provided,
    The position calculation device determines whether or not the identification information of the wireless LAN terminal device detected in the vicinity of the human body detection device satisfies a passage permission condition determined according to each of the human body detection devices. In this case, create detection information for unauthorized persons
    The terminal position detection system, wherein the display device displays an abnormality occurrence based on the passage-permitted person detection information.
  27. The terminal position detection system according to claim 26, wherein
    A camera capable of photographing the human body in conjunction with the human body detecting device detecting the human body,
    A terminal position detection system configured to be able to deliver an image taken by the camera to the wireless LAN terminal device when an abnormality occurs.
  28. The terminal position detection system according to any one of claims 1 to 27,
    When the position of the wireless LAN terminal device estimated by the position calculation device is within a predetermined prohibited area, forbidden area entry detection information is created,
    The terminal position detection system, wherein the display device displays an abnormality occurrence based on the prohibited area entry detection information.
  29. The terminal position detection system according to any one of claims 1 to 28, wherein:
    The wireless LAN terminal device includes an information display unit,
    When an abnormality occurs, information indicating the content of the abnormality is distributed to the wireless LAN terminal device and displayed on the information display unit.
  30. The terminal position detection system according to claim 29, wherein
    When an abnormality occurs, it is configured that different information can be distributed between a wireless LAN terminal device whose position estimated by the position calculation device is close to the abnormality occurrence point and a wireless LAN terminal device that is not so. A terminal position detection system that is characterized.
  31. The terminal position detection system according to any one of claims 1 to 30,
    The repeater is installed on both floors adjacent in the vertical direction in a multi-floor building, and the relay on the upper floor is disposed so as not to correspond to the relay on the lower floor in the vertical direction. A terminal position detection system.
  32.   32. A sailor position management system, wherein the terminal position detection system according to any one of claims 1 to 31 is installed on a ship, and a sailor is carried by the wireless LAN terminal device.
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