JP5070726B2 - System and method for locating moving object at construction site - Google Patents

Description

  The present invention relates to a system and a method for specifying a position of a moving object at a construction site.

The position of a person in an office space or the like is specified using an IC tag. For example, Patent Document 1 uses a IC tag and a plurality of readers to specify a portion (common range) where communication ranges of a plurality of readers that have received response signals from the IC tag overlap as a position of the IC tag. It is disclosed.
JP 2003-296667 A

  In the mechanism described in Patent Document 1, the position of the IC tag is specified on the assumption that the communication range of the reader is known. However, at a construction site, for example, a new boundary wall is provided according to the progress of work, or noise is generated from work equipment, and the propagation state of radio waves is likely to change. In such a situation where the communication range of the reader changes due to the change in the propagation state of the radio wave, the mechanism described in Patent Document 1 cannot accurately identify the position of the IC tag.

  This point will be described with reference to FIG. In FIG. 17A, it is assumed that first to third readers are installed and can communicate with the IC tag 95 in predetermined communication ranges 91 to 93, respectively. Under such circumstances, the mechanism described in Patent Document 1 determines that the IC tag 95 is located in the common range 94 where the communication ranges 91 to 93 overlap. However, due to environmental changes, as shown in FIG. 17 (b), the first reader can communicate with the IC tag in the communication range 91 ', and the third reader can communicate with the IC tag. If the communication range of the second reader remains 92, the mechanism described in Patent Document 1 is within the communication range 92 and overlaps with the communication ranges 91 and 93. It will be determined that the IC tag is located within the range 96 which is a portion that does not become necessary.

  The present invention has been made in view of such a background, and provides a position specifying method and a position specifying system capable of accurately specifying the position of an IC tag attached to a moving body at a construction site. Objective.

The invention according to claim 1 of the present invention for solving the above problems is a system for specifying a position of a moving object at a construction site,
A plurality of IC tags in which unique tag IDs are stored are arranged at fixed positions on the construction site, and are also attached to the moving body,
For each of the IC tags, tag information indicating whether the IC tag is a fixed tag that is the IC tag arranged at a fixed position or a moving tag that is the IC tag attached to the moving body is used as the tag ID. A tag management database to store in association;
For each of the fixed tags, a position information database that stores position information indicating the fixed position in association with the tag ID, and a plurality of tag IDs read from the IC tag when approaching the IC tag A reader device and a computer that is communicably connected to the reader device, wherein the reader device transmits an inquiry radio wave to the IC tag by changing a transmitted radio wave intensity; A tag ID reading unit that reads the tag ID that is answered as a reflected wave of the inquiry radio wave from at least one of the fixed tags, and a tag ID transmission unit that transmits the read tag ID to the computer for each transmitted radio wave intensity When, wherein the computer, the data of the outgoing wave intensity each from each of the plurality of reader devices A tag ID receiving unit that receives the ID, for each of the reader device, for each of the outgoing radio wave intensity, of the tag ID corresponding to the received the outgoing radio wave intensity, corresponding to the tag information indicating the fixed tag The tag ID is specified from the tag management database, the position information corresponding to the specified tag ID is read from the position information database, and a first area at the construction site is specified based on the read position information. The transmission in the case where the tag ID corresponding to the tag information indicating the moving tag is included in the tag ID received from the reader device in the first area for each of the transmitted radio wave intensities. From the first region regarding the radio wave intensity, the tag ID corresponding to the tag information indicating the moving tag is the Lee. A second area obtained by deleting the first area for the transmitted radio wave intensity when not included in the tag ID received from the apparatus is specified, and the second area specified for each reader apparatus is the overlapping region, be provided with a mobile position identification unit that identifies a region where the moving object may be located at the construction site, but according to the position location system of the mobile body in the construction site, characterized in.

According to the position specifying system of the present invention, based on the fixed tag, the reader device at the construction site specifies the radio wave reception area from which the tag ID can be read from the IC tag, and the position of the moving tag is determined based on the specified reception area. Can be determined. Therefore, even when the propagation status of radio waves changes due to noise from work equipment, newly installed walls, etc., as in the construction site, and the radio signal reception area of the reader device changes, the changing reception area I can grasp it. Therefore, the position of the moving tag can be specified more accurately.
Moreover, since the area | region which has a moving tag in the part which the receiving area of the radio wave of a reader apparatus overlaps can be limited using a some reader apparatus, the position of a moving tag can be pinpointed more accurately.
In this case, since the reader device inquires of the IC tag about the tag ID by changing the intensity of the radio wave, the reader apparatus obtains the tag ID from the reception areas having different sizes according to the radio wave intensity, and the computer The position of the moving tag can be limited to an area in which there is a response from the moving tag. Thereby, the position of the moving tag can be specified with higher accuracy.

The invention according to claim 2 of the present invention is a system for specifying a position of a moving body at a construction site , and a plurality of IC tags storing unique tag IDs are arranged at fixed positions at the construction site. The IC tag is also a fixed tag that is the IC tag arranged at a fixed position or the IC tag that is attached to the moving body. A tag management database that stores tag information indicating whether it is a moving tag in association with the tag ID, and a position information database that stores position information indicating the fixed position in association with the tag ID for each of the fixed tags A plurality of reader devices that read the tag ID from the IC tag when approaching the IC tag, and a communication device that can communicate with the reader device. The reader device receives the notification radio wave of the tag ID transmitted from at least one of the moving tag and the fixed tag, reads the tag ID, and transmits the notification radio wave A tag ID reading unit for measuring the received radio wave intensity, a computer connected to the reader device so as to be communicable, a tag ID transmission unit for transmitting the read tag ID to the computer for each received radio wave intensity, The computer includes a tag ID receiving unit that receives the tag ID for each received radio wave intensity from each of the plurality of reader devices, and the received radio wave for each of the received radio wave strengths for each reader device. Among the tag IDs corresponding to the strength, the tag ID corresponding to the tag information indicating the fixed tag is set as the tag. The location information identified from the management database, the location information corresponding to the identified tag ID is read from the location information database, the first region at the construction site is identified based on the read location information, and the received radio wave intensity The received radio wave intensity when the tag ID corresponding to the tag information indicating the moving tag is included in the tag ID received from the reader device in the first region for each of the From the first area, the first area for the received radio wave intensity when the tag ID corresponding to the tag information indicating the moving tag is not included in the tag ID received from the reader device. The deleted second area is specified, and the area where the second area specified for each reader device overlaps the previous area at the construction site. A moving body position specifying unit that specifies a region where the moving body can be located is provided.

Moreover, invention of Claim 4 among this invention is a position specifying system of the mobile body in the construction site of Claim 2 , Comprising: The said mobile body position specific part is the said tag information which shows the said fixed tag among the tag ID corresponding to, select what difference between the received signal strength corresponding to the tag ID corresponding to the tag information indicating the moving tag corresponding to the received signal strength within a predetermined value, based on the positional information corresponding to the selected tag ID, and the identifying a region where the moving object may be located.
In this case, an area where the mobile tag can be located can be specified based on the fixed tag that responds with the same radio field intensity as the response from the mobile tag. Therefore, the position of the moving tag is specified using a narrower region, and the accuracy of specifying the position can be further improved.

Moreover, the invention according to claim 6 of the present invention is the system for specifying the position of the mobile object at the construction site according to claim 2 , wherein the tag ID reading unit changes the reception directing direction of the radio wave. The tag ID is read from at least one of the mobile tag and the fixed tag, and the tag ID transmission unit transmits the tag ID to the computer for each of the received radio wave intensity and the reception directivity direction, and the mobile body The position specifying unit specifies the third region where the second region overlaps for each reception directing direction, and the region where the specified third region overlaps for each specified reception directing direction at the construction site moving body and be determined as the area that can be located.
In this case, the reader device has radio wave reception directivity, and the reception area can be specified on the basis of the fixed tag for each directivity direction. Therefore, the position of the moving tag can be set within a narrower range with one reader device. Can be identified. Therefore, the position of the moving tag can be specified with higher accuracy.

The invention according to claim 7 of the present invention is the system for specifying a position of a moving object at a construction site according to any one of claims 1 to 6 , wherein the moving object enters at the construction site. The prohibited area database for storing prohibited area information for specifying the prohibited area, and the prohibited area information for specifying the prohibited area that overlaps at least a part of the area where the mobile body can be located are registered in the prohibited area database. An entry determination unit that determines whether the moving body has entered the entry prohibition area, and a warning message output unit that outputs a warning message when it is determined that the mobile body has entered the entry prohibition area. I will prepare. Accordingly, it is possible to detect that a moving body has entered the entry prohibited place without installing a human sensor or the like in the entry prohibited place. The user can easily grasp that a worker or the like has entered the restricted entry area at the construction site, and can be used for risk management at the construction site.

The invention according to claim 8 of the present invention is the system for specifying a position of a moving object at a construction site according to claim 7 , wherein the prohibited area database includes attribute information indicating an attribute of the moving object. And the computer is connected to an attribute management database that stores the attribute information in association with the tag ID of the moving tag, and Among the tag IDs received from the reader device, the tag ID corresponding to the tag information indicating the moving tag is identified from the tag management database, and the attribute information corresponding to the identified tag ID is identified in the attribute management database. And the entry determining unit includes the prohibited area information registered in the prohibited area database. Depending on whether there is to identify at least a part overlaps the restricted area of the area corresponding to the acquired attribute information, the movable body is to be determined whether the entered the restricted area.

In addition, the invention according to claim 9 of the present invention is the system for specifying the position of the mobile object at the construction site according to any one of claims 1 to 8 , wherein the mobile object enters the construction site. The prohibited tag database that stores the tag ID of the fixed tag adjacent to the prohibited area, and the movement depending on whether the tag ID of the fixed tag specified from the tag management database is stored in the prohibited tag database. An approach determination unit that determines whether or not a body has approached the entry prohibition area and a warning message output unit that outputs a warning message when it is determined that the mobile body has approached the entry prohibition area.

The invention according to claim 10 of the present invention is a method for specifying a position of a moving body at a construction site, wherein a plurality of IC tags storing unique tag IDs are fixed positions at the construction site. A plurality of reader devices that read the tag ID from the IC tag when they approach the IC tag and change the transmitted radio wave intensity and inquire the IC tag. and transmitting a radio wave, is the response as a reflected wave of the query radio wave from at least one of the plurality of fixed tags and mobile tag the is the IC tag attached to the moving body which is the IC tag is placed in a fixed position the The tag ID is read, and the read tag ID is transmitted to the computer connected to be able to communicate with the reader device for each outgoing radio wave intensity. For each of the IC tags, a tag management database that stores tag information indicating whether the IC tag is the fixed tag or the moving tag in association with the tag ID, and each of the fixed tag, The tag is associated with a tag ID and is connected to a location information database that stores location information indicating the fixed location, and the computer receives the tag for each of the transmitted radio wave intensities from each of the plurality of reader devices. For each of the transmission radio field strengths, the tag ID corresponding to the tag information indicating the fixed tag among the received tag IDs corresponding to the transmission radio field intensity is received for each reader device. The position information identified from the tag management database and the position information corresponding to the identified tag ID The first area in the construction site is identified based on the read position information and corresponds to the tag information indicating the moving tag in the first area for each of the transmitted radio wave intensities. The tag ID corresponding to the tag information indicating the moving tag from the first area regarding the transmitted radio wave intensity when the tag ID is included in the tag ID received from the reader device is The second area specified for each reader apparatus is specified by identifying the second area from which the first area for the transmitted radio wave intensity is not included in the tag ID received from the reader apparatus. The region where the moving bodies can be located at the construction site is specified as the region where the two overlap.

  Other problems and solutions to be disclosed by the present application will be made clear by the embodiments of the invention and the drawings.

  ADVANTAGE OF THE INVENTION According to this invention, the position of the IC tag attached to the mobile body in the construction site can be specified with high accuracy.

== System configuration ==
Hereinafter, the worker management system according to the present embodiment will be described. The worker management system of this embodiment is for managing where a worker is located on a construction site.

  FIG. 1 is a diagram showing an overall configuration of a worker management system according to the present embodiment. The worker management system of the present embodiment includes a management device 10, an IC tag 21 (hereinafter also referred to as a fixed tag) fixed at a specific position on the construction site 1, and a worker (moving body) working on the construction site 1. First to third reader devices 30 having an attached IC tag 22 (hereinafter also referred to as a moving tag), a function of reading data from the IC tag 21 or 22, and a function of performing communication between the management device 10 It has.

  Each of the IC tags 21 and 22 stores a unique tag ID. The reader device 30 is a device that reads the tag ID wirelessly from the adjacent IC tags 21 and 22. The reader device 30 can use a general IC tag reader / writer or the like. In this embodiment, it is assumed that the IC tags 21 and 22 are active type IC tags that regularly receive power from a power source such as a battery or a power generation mechanism and transmit radio waves. The IC tags 21 and 22 have the same hardware configuration, and the reader device 30 receives radio waves of the same intensity from the IC tags 21 and 22 at the same distance if the conditions are the same.

== Management device 10 ==
FIG. 2 is a diagram illustrating a hardware configuration of the management apparatus 10. In the present embodiment, the management apparatus 10 is assumed to be a general computer such as a personal computer or a workstation. As shown in FIG. 2, the management device 10 includes a CPU 11, a memory 12, a storage device 13, a reader interface 14, an input device 15, and an output device 16.

  The storage device 13 stores programs and data, for example, a hard disk drive, a CD-ROM drive, a flash disk, or the like. The CPU 11 implements various functions by reading the program stored in the storage device 13 into the memory 12 and executing it. The reader interface 14 is an interface for acquiring information including a tag ID read by the reader device 30 from the IC tags 21 and 22 (hereinafter referred to as measurement tag information) from the reader device 30. As the reader interface 14, for example, a wireless communication interface that performs wireless communication with the reader device 30 can be employed. Note that the management device 10 and the reader device 30 may be connected by wire. In this case, the reader interface 14 may be a serial interface that complies with standards such as RS232C, RS485, and USB. The input device 15 is, for example, a keyboard or a mouse that accepts data input from a user. The output device 16 is, for example, a display, a printer, or a speaker that outputs data to the user.

  FIG. 3 is a functional block diagram of the management apparatus 10. As shown in the figure, the management device 10 includes a measurement tag information acquisition unit 111, a movement tag position calculation unit 112, a movement tag position output unit 113, a warning message output unit 114, a man-hour counting unit 115, a movement tag information database 151, A fixed tag information database 152, a movement history database 153, a prohibited area database 154, and a work area database 155 are provided.

  The measurement tag information acquisition unit 111 receives measurement tag information transmitted from the reader device 30. FIG. 4 shows a configuration example of measurement tag information transmitted from the reader device 30. As shown in the figure, the measurement tag information includes a reader ID that identifies the reader device 30 and a list of tag IDs read by the reader device 30 (hereinafter referred to as a measurement tag list).

  The movement tag information database 151 (corresponding to the attribute management database of the present invention) stores information on the movement tag and the attribute of the worker attaching the movement tag (hereinafter referred to as movement tag information). FIG. 5 shows a configuration example of the moving tag information stored in the moving tag information database 151. As shown in the figure, in the movement tag information, the name of the worker (information for identifying the worker) to which the movement tag is attached in association with the tag ID for identifying the movement tag, and the function classification to which the worker belongs (Hereinafter simply referred to as affiliation). In the present embodiment, the name and the function classification to which the worker belongs are managed as the attributes of the worker. However, the present invention is not limited to this. For example, the qualification or license of the worker is managed. It may be.

  The fixed tag information database 152 stores information including the position of the fixed tag (hereinafter referred to as fixed tag information). FIG. 6 shows a configuration example of fixed tag information stored in the fixed tag information database 152. As shown in the figure, the fixed tag information is associated with the tag ID and position information indicating the position where the fixed tag is installed at the construction site 1. In the present embodiment, the position of the construction site 1 is specified by one cell of a grid obtained by dividing the construction site 1 into 10 parts vertically and horizontally, and is expressed in the form of (X, Y).

  The movement history database 153 stores the history (hereinafter referred to as movement history information) of the position of the movement tag (hereinafter referred to as movement tag position) on the construction site 1. In the present embodiment, the moving tag position is expressed as a list of position information expressed in the above-described (X, Y) format as an area where the moving tag can exist in the construction site 1. The moving tag position is determined from a range in which the reader device 30 can acquire the tag ID, as will be described later. FIG. 7 shows a configuration example of the movement history information stored in the movement history database 153. As shown in the figure, the movement history information includes a tag ID for specifying a movement tag and a movement tag position in association with the date and time. The date and time of the movement history information is the date and time when the position of the movement tag is calculated by a process described later.

  The prohibited area database 154 records information (hereinafter referred to as “prohibited area information”) including an area (hereinafter referred to as “prohibited area”) that is prohibited from entering in the construction site 1. FIG. 8 shows a configuration example of prohibited area information stored in the prohibited area database 154. As shown in the figure, the prohibited area information includes a prohibited area and information indicating the affiliation of a worker permitted to enter the prohibited area. As will be described later, a warning message is output when there is a possibility that a movement tag is located in the prohibited area, but the affiliation of the worker corresponding to the movement tag is included in the permitted area of the prohibited area information. If it is, no warning message is output.

  The work area database 155 stores information (hereinafter referred to as work area information) including a work area (hereinafter referred to as a work area) in the construction site 1. FIG. 9 shows a configuration example of the work area information stored in the work area database 155. As shown in the figure, the work area information includes a work area and a name.

  The moving tag position calculation unit 112 calculates the moving tag position based on the measurement tag information received from the reader device 30. Details of the process of calculating the moving tag position will be described later.

  The moving tag position output unit 113 outputs the moving tag position calculated by the moving tag position calculation unit 112 to the output device 16. FIG. 10 shows an example of the screen 40 output by the moving tag position output unit 113. On the screen 40, an icon 211 indicating the position where the fixed tag is arranged on the construction site 1 is displayed, and the fixed tag corresponding to the moving position is displayed as the icon 212. The areas 41 to 43 display areas where the first to third reader devices 30 can read the tag IDs from the IC tags 21 and 22 (hereinafter referred to as reception areas), respectively. As will be described later, the portion where the reception areas of the reader device 30 that can read the tag ID from the moving tag overlap is the moving tag position.

  The warning message output unit 114 displays a warning message indicating that when the moving tag position calculated by the moving tag position calculation unit 112 overlaps a part of the prohibited area of the prohibited area information registered in the prohibited area database 154. Is output. The warning message output unit 114 notifies the warning message to the worker at the construction site 1 by displaying a warning message on the output device 16 such as a display or outputting a warning sound from a speaker, for example.

  Based on the movement history database 153, the man-hour totaling unit 115 totals and outputs the time worked by the worker at the construction site 1 by affiliation. Details of the processing of the man-hour counting unit 115 will be described later.

== Processing ==
Hereinafter, processing in the worker management system of the present embodiment will be described. FIG. 11 is a flowchart showing the flow of processing for calculating the moving tag position in the management apparatus 10.

  The management device 10 performs the following processing for each of the first to third reader devices 30. The measurement tag information acquisition unit 111 receives the measurement tag information from the reader device 30 (S501), and the movement tag position calculation unit 112 reads out the movement tag information registered in the movement tag information database 151 and reads out the read movement tag. It is determined whether the tag ID of the moving tag has been acquired based on whether the tag ID included in the information is included in the measurement tag list of the measurement tag information received from the reader device 30 (S502).

  When the tag ID of the moving tag has been acquired (S502: YES), the moving tag position calculation unit 112 includes a tag ID other than the tag ID of the moving tag included in the measurement tag list of the measurement tag information ( That is, the tag ID of the fixed tag is extracted (S503), and the position information corresponding to the extracted tag ID of the fixed tag is acquired from the fixed tag information database 152 (S504). The movement tag position calculation unit 112 creates a list of acquired position information as a reception area of the reader device 30 (S505).

  The management device 10 performs the above processing for each reader device 30, and the moving tag position calculation unit 112 creates one or more reception areas for any one of the first to third reader devices 30 (S506). : YES), the moving tag position calculation unit 112 sets a list of position information overlapping between the created reception areas as the moving tag position (S507). On the other hand, if the reception area cannot be created for any of the first to third reader devices 30 (S506: NO), the moving tag position is set to an empty list (S508).

  As described above, the management apparatus 10 according to the present embodiment can specify the moving tag position at the construction site 1. The moving tag position specified as described above is output to the screen 40 shown in FIG. 10 by the moving tag position output unit 113. On the screen 40, the reception areas 41 to 43 of the first to third reader devices 30 are displayed. The fixed tag 11 included in the area 44 where the reception areas 41 to 43 overlap is “(6,3) (5,4) (6,4) (5,5) (6,5) (5,6)”. Is installed. In the example of FIG. 10, the fixed tag 11 included in the area 44 is displayed as an icon 212. The user can grasp from the screen 40 that the moving tag 22 is located in the area 44 including the icon 212.

  According to the worker position management system of the present embodiment, the reader device 30 reads the tag ID from the moving tag and also reads the tag ID from the fixed tag, and the management device 10 obtains based on the position information of the fixed tag. The moving tag position can be determined using the reception area of the reader device 30. Therefore, in general, the propagation situation of radio waves always changes according to the progress of construction work, such as construction of a new boundary wall or slab at the construction site, or generation of noise from the work equipment. Although the 30 reception areas may change, the management apparatus 10 of the present embodiment obtains the reception area of the reader device 30 every time it is processed, and thus can accurately identify the position of the moving tag. . Therefore, the position of the moving tag can be accurately calculated without performing the calibration work that has been conventionally performed to identify the reception area of the reader device 30.

== Warning message output processing ==
FIG. 12 is a flowchart showing the flow of warning message output processing.

  When the moving tag position calculated by the moving tag position calculating unit 112 is not empty (S521: YES), the warning message output unit 114 is included in the moving tag position among the prohibited area information registered in the prohibited area database 154. The location information that is included in the prohibited area is acquired (S522).

  When one or more of the prohibited area information can be acquired (S523), the warning message output unit 114 acquires the movement tag information corresponding to the tag ID of the movement tag from the movement tag information database 151 (S524), and Among the prohibited area information, the information to which the acquired movement tag information does not belong is extracted (S525).

  The warning message output unit 114 displays the prohibited area for each of the extracted prohibited area information (S526), outputs a message that a worker has entered the prohibited area (S527), and the worker name of the movement tag information And affiliation are output (S528).

  FIG. 13 is a diagram illustrating an example of a screen 50 that the warning message output unit 114 outputs to a display or the like. In the example of FIG. 13, a restricted entry area 51 is displayed on the screen 50, and a message 52 indicating that a worker has entered the restricted entry area including the worker name and affiliation is displayed.

  As described above, when the position of the moving tag attached to the worker overlaps with the area set as the prohibited area in the prohibited area database 154, the warning message output unit 114 notifies the site supervisor to that effect. The user can be notified.

== Man-hour totaling process ==
FIG. 14 is a flowchart showing a flow of work time totaling processing by the man-hour totaling unit 115.
The man-hour counting unit 115 reads the work area information from the work area database 155 (S541), and performs the following processing for each of the read work area information.

The man-hour counting unit 115 reads the movement history information corresponding to the movement tag position including the position information included in the work area of the work area information from the movement history database 153 (S542), and for each tag ID of the read movement history information. The latest date and the oldest date and time corresponding to the tag ID are acquired from the read movement history information, and the oldest date and time is subtracted from the acquired newest date and time to calculate the work time corresponding to the tag ID (S543). ). The man-hour counting unit 115 acquires the affiliation corresponding to the tag ID from the moving tag information database 151 (S544), and compiles the work time for each tag ID for each affiliation (S545). Here, the aggregation is, for example, a total or an average.
The man-hour totaling unit 115 outputs the total value of the totaled work time for each affiliation together with the name of the work area in the work area information (S546).

  As described above, the man-hour counting unit 115 can identify the work area of the construction site 1 where the worker is located based on the moving tag position, and can total the work time for each affiliation of the worker. Thereby, it is possible to easily grasp the work time of the worker.

  In the present embodiment, the position of the worker on the construction site 1 is managed. However, by attaching a moving tag to a thing that moves on the construction site 1, for example, a material transported in the construction site 1 It is possible to manage the position of an arbitrary moving body such as a work tool, a work vehicle, or construction equipment.

  In the present embodiment, the construction site 1 is managed by a grid that is divided into 10 equal parts vertically and horizontally. However, a fixed tag may be arranged and managed in each of the more divided areas. Further, the fixed tags are not necessarily arranged at equal intervals. For example, when the position specifying accuracy varies depending on the location, more fixed tags can be arranged at a location where the moving tag position is desired to be specified with higher accuracy.

  In the present embodiment, the IC tags 21 and 22 are active type IC tags that periodically receive power from a power source such as a battery or a power generation mechanism and transmit radio waves. However, the present invention is not limited to this. For example, a passive type IC tag that responds with a tag ID as a reflected wave with respect to the inquiry radio wave from the reader device 30 or a power supply from a power source such as a battery according to the inquiry radio wave from the reader device 30 transmits the radio wave. A semi-passive type IC tag may be adopted.

  In the present embodiment, three reader devices 30 are installed. However, the present invention is not limited to this, and an arbitrary number of reader devices 30 may be installed. Further, the radio wave reception sensitivity of the reader device 30 installed at the construction site 1 may be different.

  In this embodiment, it is determined that the workers belonging to the affiliation registered in the prohibited area database 154 are permitted to enter the prohibited area. For example, the movement tag information database 151 The condition of the attribute corresponding to the movement tag is managed in the prohibited area database 154 by managing the attributes of the worker such as qualifications and licenses, and managing the conditions for the attribute in the prohibited area database 154. It may be determined whether or not entry into the prohibited area is permitted depending on whether or not the condition is satisfied.

  Moreover, in this embodiment, although the working time in a worker's work area was calculated, the time when the worker was located in various places besides this can be calculated. Thus, for example, when a morning meeting is held at a construction site, it is determined whether the worker was attending the morning meeting depending on whether the moving tag was located in the area where the morning meeting was held during the morning meeting. You can also In this case, when the management device 10 detects the tag ID of a worker who does not attend the morning meeting, the management device 10 outputs a message instructing a user such as a foreman to perform safety guidance. You can also.

  In addition, the management apparatus 10 includes a database of construction processes and work schedules, and the management apparatus 10 manages work schedules in association with work schedules and affiliations. Depending on whether the work time of the worker has exceeded the scheduled time, it may be determined whether the work schedule has ended. Thereby, the management apparatus 10 can output the progress of construction work.

  Further, the management device 10 may output a warning message when approaching a dangerous place. In this case, the management apparatus 10 is provided with a dangerous place management database that stores the tag ID of the fixed tag arranged near the dangerous place, and the tag ID stored in the dangerous place management database at the moving tag position. Can be output, a warning message indicating that the worker is approaching the hazardous area can be output. Accordingly, it is possible to detect that the worker has approached the dangerous place without arranging a human sensor or the like.

== Variation 1: Utilization of received radio wave intensity ==
In the worker management system of the present embodiment described above, the reader device 30 calculates the area where the moving tag can exist in the construction site 1 from the position of the fixed tag from which the tag ID could be read. The accuracy can be further improved by using the intensity of the radio wave received by the device 30 from the fixed tag. In this case, the reader device 30 measures the received radio wave intensity from the fixed tag when reading the tag ID from the fixed tag, and transmits the measurement tag information to the management apparatus 10 for each received radio wave intensity. In the movement tag position calculation process shown in FIG. 11, the management device 10 receives measurement tag information for each received radio wave intensity from the same reader device 30, and moves the measurement tag information for which the same reader ID is set. The position information of the measurement tag list not including the tag ID of the moving tag is deleted from the measurement tag list including the tag ID of the tag. As a result, the moving tag position is calculated from the position of the fixed tag having a reception radio wave intensity comparable to the reception radio wave intensity from the mobile tag.

  FIG. 15 is a diagram illustrating an example of the reception area 33 of the first reader device 30 when the received radio wave intensity is used. In the example of FIG. 15, when the first reader device 30 receives a radio wave having a first received radio wave intensity (a receivable range of a radio wave having the first received radio wave intensity or more is indicated by a circle 31), the moving tag 22. Radio waves can be received from the mobile tag 22 and when the radio wave having the second received radio wave intensity is received (a receivable range of the radio wave having the second received radio wave intensity or more is indicated by a circle 32), Cannot receive. In the above-described embodiment, the list of information of the fixed tag located in the circle 31 capable of receiving a radio wave having a strength equal to or higher than the first reception radio wave intensity is the reception area of the first reader device 30. The fixed tag in the circle 32 that can receive the radio wave with the second received radio wave intensity or higher that cannot receive the radio wave from the moving tag 22 is excluded from the fixed tag that is located in the circle 31 that can receive the radio wave with the radio wave intensity higher than the received radio wave. The area 33 is a reception area of the first reader device 30.

  As a result, it is possible to calculate the moving tag position by narrowing the receiving area for each reader device 30, so that the accuracy of the moving tag position can be further increased.

== Modification 2: Change of directivity direction ==
Further, the reader device 30 includes an antenna having radio wave reception directivity and a mechanism for changing the directivity direction, and manages measurement tag information for each of a plurality of predetermined directivity directions and received radio wave intensities from the IC tag. You may make it transmit to the apparatus 10. FIG. In this case, the management device 10 receives a plurality of measurement tag information from the same reader device 30 and moves the measurement tag information for which the same reader ID is set in the calculation processing of the movement tag position shown in FIG. The position information of the measurement tag list not including the tag ID of the moving tag is deleted from the measurement tag list including the tag ID of the tag.

  FIG. 16 is a diagram illustrating an example of a reception area of the first reader device 30 when the received radio wave intensity and the reception directivity direction are used. In the example of FIG. 16, the first reader device 30 receives a radio wave having the first received radio wave intensity from the first directivity direction (can receive a radio wave having the first receive radio wave intensity or higher from the first directivity direction). The range is indicated by a circle 31 ′.) When radio waves can be received from the mobile tag 22 and radio waves having the second received radio wave intensity are received from the first directivity direction (second reception from the first directivity direction). In a circle 32 ′, the radio wave receivable range of the radio wave intensity or higher is not received from the mobile tag 22. Further, when the first reader device 30 receives a radio wave having the first received radio wave intensity in the second directivity direction (a receivable range of the radio wave having the first receive radio wave intensity or higher from the second directivity direction). Is indicated by a circle 34.) When a radio wave can be received from the moving tag 22 and a radio wave having the second received radio wave intensity is received from the second directivity direction (the second receive radio wave intensity from the second directivity direction). The above radio wave receivable range is indicated by a circle 35.) The radio wave cannot be received from the moving tag 22. Here, the region 33 ′ in which the position of the fixed tag in the circle 32 ′ is removed from the position of the fixed tag in the circle 31 ′, and the position of the fixed tag in the circle 35 is removed from the position of the fixed tag in the circle 34. A region intersecting with the region 36 is a reception region of the first reader device 30.

  Thereby, since the moving tag position can be calculated by further narrowing the reception area for each reader device 30, the accuracy of the moving tag position can be further increased. In addition, since it is possible to investigate whether or not a moving tag is located in a plurality of areas using one reader device 30, the number of reader devices 30 to be installed can be reduced.

  In addition to the above-described modifications, for example, the reader device 30 is attached to an overhead crane or a worker, and the reader device 30 moves from the IC tags 21 and 22 at a plurality of locations as the overhead crane or the worker moves. The ID may be read. In this case, since the position of the moving tag can be investigated in a plurality of reception areas by one reader device 30, the moving tag position can be obtained with high accuracy by a small number of reader devices 30.

  Also in the above-described modifications, passive IC tags and semi-passive IC tags may be used as the IC tag 21 and the IC tag 22. In this case, the radio wave intensity transmitted from the reader device 30 is changed, and the measurement tag information is transmitted to the management device 10 for each radio wave intensity transmitted from the reader device 30, as in the above-described modification. The accuracy of the position of the moving tag to be calculated can be improved.

  Although the present embodiment has been described above, the above embodiment is intended to facilitate understanding of the present invention and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

  For example, it is possible to specify a moving tag at various places other than the construction site.

It is a figure which shows the structural example of the worker management system which concerns on this embodiment. 2 is a diagram illustrating a hardware configuration of a management device 10. FIG. 2 is a functional block diagram of a management device 10. FIG. 4 is a diagram illustrating a configuration example of measurement tag information transmitted from a reader device 30. FIG. It is a figure which shows the structural example of the movement tag information memorize | stored in the movement tag information database 151. It is a figure which shows the structural example of the fixed tag information memorize | stored in the fixed tag information database 152. FIG. It is a figure which shows the structural example of the movement history information memorize | stored in the movement history database. It is a figure which shows the structural example of the prohibited area information memorize | stored in the prohibited area database. It is a figure which shows the structural example of the work area information memorize | stored in the work area database. It is a figure which shows an example of the screen 40 which the movement tag position output part 113 outputs. It is a flowchart which shows the flow of a process which calculates a movement tag position in the management apparatus. It is a flowchart which shows the flow of the output process of a warning message. It is a figure which shows an example of the screen 50 which the warning message output part 114 outputs to a display etc. FIG. It is a flowchart which shows the flow of the total process of work time. It is a figure which shows an example of the receiving area 33 of the 1st reader apparatus 30 at the time of changing a field intensity. It is a figure which shows an example of the receiving area of the 1st reader apparatus 30 at the time of changing a field intensity and a receiving directivity direction. It is a figure explaining the method of detecting the position of the conventional IC tag.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Construction site 10 Management apparatus 11 CPU 12 Memory 13 Storage apparatus 14 Reader interface 15 Input apparatus 16 Output apparatus 21 IC tag, fixed tag 22 IC tag, moving tag 30 Reader apparatus 111 Measurement tag information acquisition part 112 Moving tag position calculation part 113 Movement tag position output unit 114 Warning message output unit 115 Man-hour counting unit 151 Movement tag information database 152 Fixed tag information database 153 Movement history database 154 Prohibited area database

Claims (11)

A system for positioning a moving object at a construction site,
A plurality of IC tags in which unique tag IDs are stored are arranged at fixed positions on the construction site, and are also attached to the moving body,
For each of the IC tags, tag information indicating whether the IC tag is a fixed tag that is the IC tag arranged at a fixed position or a moving tag that is the IC tag attached to the moving body is used as the tag ID. A tag management database to store in association;
For each of the fixed tags, a position information database that stores position information indicating the fixed position in association with the tag ID;
A plurality of reader devices that read the tag ID from the IC tag when approaching the IC tag;
A computer that is communicably connected to the reader device,
The reader device is
A tag ID reading unit that changes a transmitted radio wave intensity, transmits an inquiry radio wave to the IC tag, and reads the tag ID responding as a reflected wave of the inquiry radio wave from at least one of the moving tag and the fixed tag ; ,
A tag ID transmission unit that transmits the read tag ID to the computer for each outgoing radio wave intensity ;
The computer
A tag ID receiving unit that receives the tag ID for each of the transmitted radio wave intensities from each of the plurality of reader devices;
For each reader device, the tag ID corresponding to the tag information indicating the fixed tag is identified from the tag management database among the tag IDs corresponding to the transmitted signal strength received for each reader device. Then, the position information corresponding to the identified tag ID is read from the position information database, the first area in the construction site is specified based on the read position information, and the transmission radio field intensity is From the first region regarding the transmitted radio wave intensity when the tag ID corresponding to the tag information indicating the moving tag is included in the tag ID received from the reader device. The tag ID corresponding to the tag information indicating the moving tag is included in the tag ID received from the reader device. Identifying a second region obtained by deleting the first region of the outgoing electric wave intensity when not been, the second region overlap region identified for each of the reader device, said at the construction site further comprising a mobile position identification unit moving body is identified as a region that can be located, and
A system for identifying the location of a moving object at a construction site.   A system for positioning a moving object at a construction site,
  A plurality of IC tags in which unique tag IDs are stored are arranged at fixed positions on the construction site, and are also attached to the moving body,
  For each of the IC tags, tag information indicating whether the IC tag is a fixed tag that is the IC tag arranged at a fixed position or a moving tag that is the IC tag attached to the moving body is used as the tag ID. A tag management database to store in association;
  For each of the fixed tags, a position information database that stores position information indicating the fixed position in association with the tag ID;
  A plurality of reader devices that read the tag ID from the IC tag when approaching the IC tag;
  A computer that is communicably connected to the reader device,
  The reader device is
    A tag ID reading unit that receives a notification radio wave of the tag ID transmitted from at least one of the moving tag and the fixed tag, reads the tag ID, and measures a received radio wave intensity of the notification radio wave;
    A computer connected to the reader device in a communicable manner, and a tag ID transmitter for transmitting the read tag ID to the computer for each received radio wave intensity;
  The computer
    A tag ID receiving unit that receives the tag ID for each received radio wave intensity from each of the plurality of reader devices;
    For each of the received radio field strengths, for each of the reader devices, the tag ID corresponding to the tag information indicating the fixed tag among the tag IDs corresponding to the received radio field intensity is specified from the tag management database, The position information corresponding to the identified tag ID is read from the position information database, and based on the read position information, a first area in the construction site is specified, and the received radio field intensity for each of the received radio field strengths From the first area of the received radio wave intensity when the tag ID corresponding to the tag information indicating the moving tag is included in the tag ID received from the reader device, among the areas of 1. The tag ID corresponding to the tag information indicating the moving tag is included in the tag ID received from the reader device. The second area in which the first area with respect to the received radio wave intensity when there is not is identified, and the area where the second area identified for each reader device overlaps the mobile body at the construction site A moving body position specifying unit that specifies a region where the can be located,
  A system for identifying the location of a moving object at a construction site. A system for specifying a position of a moving object at a construction site according to claim 1,
  The mobile body position specifying unit is configured such that a difference between the tag ID corresponding to the tag information indicating the mobile tag among the tag IDs corresponding to the tag information indicating the fixed tag is different from the transmitted radio wave intensity corresponding to the tag ID. Selecting an area corresponding to the transmitted radio wave intensity within a predetermined value, and identifying a region where the mobile body can be located based on the position information corresponding to the selected tag ID;
  Positioning system characterized by. A system for specifying a position of a moving object at a construction site according to claim 2 ,
The mobile body position specifying unit is configured such that, of the tag IDs corresponding to the tag information indicating the fixed tag , a difference between the received radio wave intensity corresponding to the tag ID corresponding to the tag information indicating the mobile tag is determined. select the one corresponding to the received signal strength within a predetermined value, based on the positional information corresponding to the selected tag ID, the specific area where the mobile may be located that,
Positioning system characterized by. A system for specifying a position of a moving object at a construction site according to claim 1,
  The tag ID reading unit reads the tag ID from at least one of the moving tag and the fixed tag by changing a reception directing direction of radio waves.
  The tag ID transmission unit transmits the tag ID to the computer for each of the transmission radio wave intensity and the reception directing direction,
  The mobile body position specifying unit specifies a third area where the second area overlaps for each reception directing direction, and constructs an area where the specified third area overlaps for each specified reception directing direction. Determining as a region where the mobile body can be located in the field;
  Positioning system characterized by. A system for specifying a position of a moving object at a construction site according to claim 2 ,
The tag ID reading unit reads the tag ID from at least one of the moving tag and the fixed tag by changing a reception directing direction of radio waves.
The tag ID transmission unit transmits the tag ID to the computer for each of the received radio wave intensity and the reception directing direction,
The mobile body position specifying unit specifies a third area where the second area overlaps for each reception directing direction, and constructs an area where the specified third area overlaps for each specified reception directing direction. the moving body may be determined as the area that can be located in the field,
Positioning system characterized by. A position identifying system for a moving body at a construction site according to any one of claims 1 to 6 ,
A prohibited area database for storing prohibited area information for specifying a prohibited area of entry of the moving object at the construction site;
It is determined whether or not the mobile object has entered the restricted area depending on whether or not the prohibited area information that identifies the restricted area that overlaps at least a part of an area where the movable object can be located is registered in the prohibited area database. An entry determination unit for determining;
A warning message output unit for outputting a warning message when it is determined that the mobile object has entered the restricted entry area;
A position specifying system comprising: A system for specifying a position of a moving object at a construction site according to claim 7 ,
In the prohibited area database, the prohibited area information is stored in association with attribute information indicating the attribute of the mobile object,
The computer is connected to an attribute management database that stores the attribute information in association with the tag ID of the mobile tag,
Among the tag IDs received from the reader device, the tag ID corresponding to the tag information indicating the moving tag is identified from the tag management database, and the attribute information corresponding to the identified tag ID is the attribute management. It has an attribute acquisition unit that acquires from the database,
Whether the entry determining unit specifies the entry prohibited area that overlaps at least a part of the area corresponding to the acquired attribute information among the prohibited area information registered in the prohibited area database. Determining whether the moving body has entered the restricted entry area,
Positioning system characterized by. A system for specifying a position of a moving body at a construction site according to any one of claims 1 to 8 ,
A prohibition tag database for storing the tag ID of the fixed tag close to the entry prohibition area of the mobile body at the construction site;
An approach determination unit that determines whether the moving object has approached the entry-inhibited area, based on whether the tag ID of the fixed tag identified from the tag management database is stored in the prohibition tag database;
A warning message output unit that outputs a warning message when it is determined that the moving object has approached the restricted entry area;
A position specifying system comprising: A method for identifying the position of a moving object at a construction site,
A plurality of IC tags in which unique tag IDs are stored are arranged at fixed positions on the construction site and attached to the moving body,
A plurality of reader devices that read the tag ID from the IC tag when approaching the IC tag,
At least one of a plurality of fixed tags, which are the IC tags arranged at fixed positions, and a mobile tag, which is the IC tag attached to the mobile body, transmits an inquiry radio wave to the IC tag by changing the transmitted radio wave intensity. reads the tag ID that is responsive as a reflected wave of the query radio wave from,
Sending the read tag ID for each of the outgoing radio field strengths to a computer that is communicably connected to the reader device,
The computer is associated with the tag ID for each of the IC tags, a tag management database that stores tag information indicating whether the IC tag is the fixed tag or the moving tag, and each of the fixed tags, Corresponding to the tag ID, is connected to a location information database that stores location information indicating the fixed location,
The computer is
Receiving the tag ID for each of the transmitted radio wave intensities from each of the plurality of reader devices;
For each reader device, the tag ID corresponding to the tag information indicating the fixed tag is identified from the tag management database among the received tag IDs corresponding to the transmitted signal strength for each of the transmitted signal strengths. Then, the position information corresponding to the identified tag ID is read from the position information database, the first area in the construction site is identified based on the read position information, and the transmission radio field intensity is From the first region regarding the transmitted radio wave intensity when the tag ID corresponding to the tag information indicating the moving tag is included in the tag ID received from the reader device. The tag ID corresponding to the tag information indicating the moving tag is included in the tag ID received from the reader device. Wherein identifying the outgoing wave strength second region deleting the first region of the case which has not been,
Specifying an area where the second area specified for each reader device overlaps, an area where the moving body can be located at the construction site;
A position specifying method characterized by. A method for identifying the position of a moving object at a construction site,
A plurality of IC tags in which unique tag IDs are stored are arranged at fixed positions on the construction site and attached to the moving body,
A plurality of reader devices that read the tag ID from the IC tag when approaching the IC tag,
The tag ID is received by receiving a notification radio wave of the tag ID transmitted from at least one of the plurality of fixed tags that are the IC tags arranged at a fixed position and the moving tag that is the IC tag attached to the moving body. And measure the received radio wave intensity of the notification radio wave,
For each received radio wave intensity, the read tag ID is transmitted to a computer communicably connected to the reader device,
The computer is associated with the tag ID for each of the IC tags, a tag management database that stores tag information indicating whether the IC tag is the fixed tag or the moving tag, and each of the fixed tags, Corresponding to the tag ID, is connected to a location information database that stores location information indicating the fixed location,
The computer is
Receiving the tag ID for each received radio wave intensity from each of the plurality of reader devices;
For each of the received radio field strengths, for each of the reader devices, the tag ID corresponding to the tag information indicating the fixed tag among the tag IDs corresponding to the received radio field intensity is specified from the tag management database, The position information corresponding to the identified tag ID is read from the position information database, and a first region in the construction site is specified based on the read position information,
The received radio wave when the tag ID corresponding to the tag information indicating the moving tag is included in the tag ID received from the reader device in the first area for each of the received radio wave intensities. From the first region regarding the strength, the first about the received radio wave strength when the tag ID corresponding to the tag information indicating the moving tag is not included in the tag ID received from the reader device. Identify the second region from which one region was deleted,
Specifying an area where the second area specified for each reader device overlaps, an area where the moving body can be located at the construction site;
A position specifying method characterized by.

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