JP2005337872A - Position detection device and position detection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform the estimation of a present position when positioning by GPS is incapable with high precision. <P>SOLUTION: A security terminal 10 carried by a user receives signals from GPS satellites S1 to S3 on a predetermined cycle to measure a present position and transmits the positioning result to a host apparatus 3 through a telecommunications line 2. The security terminal 10 is provided with height measuring means which is calibrated by the positioning result of the GPS and measures height h from a change in atmospheric pressure, a movement distance measuring section which detects vibrations of the user in the vertical direction and determines a movement distance r with its vibration pulse multiplied by the number of steps, and a direction measuring section such as a gyro. A calculation section performs GPS positioning at positions P-2, P-1, P0. When the GPS positioning becomes inoperable thereafter, since there is a strong possibility that the user has entered a building or the underground, the last measured position P0 is set to be a reference point, and thereafter, a height h, a movement range r, and movement directions θ1, θ2 which are autonomously measured at positions P1, P2, and P3 are added. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a position detection device and a position detection system that are carried by a user and determine a current position at predetermined intervals using positioning means such as a GPS receiver, and preferably a mobile body such as a mobile phone network. The present invention relates to a device that notifies a positioning result of the positioning means through a communication network.

  Conventionally, a position detection device that receives signals from a plurality of GPS (Global Positioning System) satellites and signals from a plurality of mobile phone base stations and measures the current position at predetermined intervals by triangulation or the like. Has been put to practical use. Then, the user carries this position detection device, and the obtained positioning result is sent to a host device such as a personal computer at a monitoring center or a family home via a mobile communication network such as a mobile phone network at every predetermined period. A position detection system is also put to practical use that is useful for searching for elderly people and children by providing information about the current position of the user by transmitting and synthesizing it on a map screen. Also, in the position detection system, a button for reporting (calling) is provided on a position detection device carried by the user, and a button operation is performed when a crime is encountered or when a person feels sick. Then, the location information of the user (location reporting device) is automatically issued (called) and notified to a pre-registered reporting destination such as a close relative or a hospital via the mobile communication network. Things are also done.

  In such a position detection device and position detection system, depending on the radio wave condition, specifically, the relationship between the orbital position of the GPS satellite and the sky's outlook at the current position, and from the mobile phone base station to the current position Depending on the condition of the obstacles, positioning may become impossible. On the other hand, in the positioning by GPS, for example, the current position is determined based on satellite orbit information obtained by decoding a navigation message from a satellite and the pseudo distance between the GPS satellite and the GPS receiver. High-sensitivity GPS technology that performs periodic addition operation signal processing and satellite orbit information are stored in a database in advance and transmitted to the GPS receiver via the mobile communication network so that decoding is possible only under relatively good reception conditions. Even if the satellite orbit information that cannot be received cannot be received, network-assisted high-sensitivity GPS technology that enables positioning has been put into practical use. By using these techniques, positioning time can be shortened, and positioning is possible indoors, even in weak radio wave environments such as wooden houses and windows.

  However, there is a problem that even if such high-sensitivity technology is used, positioning cannot be performed inside a concrete building or underground. Therefore, various techniques for predicting the current position when positioning by the GPS or the like becomes impossible have been proposed. For example, in Patent Document 1, the current position is predicted based on the error, speed, and traveling direction of past positioning results.

Moreover, in patent document 2, the said position detection apparatus by the side of a user is isolate | separated into a GPS position notification terminal and a portable notification terminal, leaving the GPS position notification terminal in the position which can receive GPS, and performing an emergency call etc. Therefore, when the user holds the mobile notification terminal and receives a report from the mobile notification terminal by weak wireless, the GPS position notification terminal performs positioning and notifies the monitoring center, so that the user cannot receive GPS. Even if it is in any place, the monitoring center can grasp the position of the user. At the time of the notification, the count data of the step count counting means is also notified to the monitoring center side through the GPS position notification terminal, so that the range where the user is present is predicted.
JP 2003-215228 A JP 2001-209890 A

  In the prior art of Patent Document 1, even if positioning cannot be performed, the current position can be predicted with relatively high accuracy if the same situation as the situation in which positioning has been possible in the past continues. However, if the user changes into the building or basement and the situation changes greatly, for example, if the direction of travel is changed or the floor is moved, the prediction result is not reliable, especially in high-rise buildings, etc. From the final positioning result, only the extent of entering the building is known. In this case, even if the planar range is narrowed to some extent, if the floors are different, it becomes difficult for the relatives, doctors, and the like to search for children and victims.

  Similarly, even in the prior art of Patent Document 2, it is only possible to know how far the mobile notification terminal carried by the user is from the GPS position notification terminal, and the user enters the building or the basement. Especially, if the floor is moved, it is difficult to accurately predict the current position.

  An object of the present invention is to provide a position detection device and a position detection system capable of accurately predicting a current position when positioning is impossible.

  The position detection apparatus of the present invention is a position detection apparatus that is carried by a user and measures the current position by positioning means at predetermined intervals, and is calibrated by the positioning result by the positioning means and measures altitude from changes in atmospheric pressure. Altitude measuring means, and a current position predicting means for adding the altitude detected by the altitude measuring means to data in the vicinity of the final positioning position and predicting it as a current position when positioning by the positioning means is impossible. Features.

  According to the above configuration, the positioning means receives, for example, signals from a plurality of GPS satellites or signals from a plurality of mobile phone base stations, and positions the current position at predetermined intervals by triangulation or the like. In the position detection device, when positioning becomes impossible due to the relationship between the orbital position of the GPS satellite and the sky view at the current position, or due to the status of obstacles from the mobile phone base station to the current position, etc. In addition, altitude measuring means and current position predicting means are used for predicting the current position. The altitude measuring means measures the altitude from a change in atmospheric pressure using a barometer or the like. In that case, the altitude is affected by the change in atmospheric pressure, and the absolute altitude cannot be measured. Is detected relatively. Therefore, the absolute altitude can be measured by calibrating the positioning result obtained by the positioning means.

  And if the positioning by the positioning means becomes impossible, the current position predicting means has a high possibility that the user has entered the building or the basement, so the positioning near the final positioning position, that is, the positioning before entering the building or the basement. Based on the positioning result of the means (specifically, for example, the final positioning result may be used as it is, or an average value from the final positioning result to the previous positioning result for several samples may be obtained. ), The altitude detected by the altitude measuring means is added and predicted as the current position. Positioning results and prediction results are transmitted to the monitoring center or family home display means using display means mounted on the position detection device or using mobile communication means such as a cellular phone network, and displayed on the map screen. You may make it do.

  Therefore, when the user enters the building or the basement as described above, in the present invention, it is only known from the final positioning result that the user has entered the building or the basement. The current position can be predicted with high accuracy when positioning is impossible.

  In addition, the position detection device of the present invention moves by multiplying the vibration frequency detected by the vibration detection means by a vibration detection means for detecting vertical vibrations of a portable user and the user's preset stride. A distance calculation means for obtaining a distance, wherein the current position prediction means is a range of a moving distance from the final positioning position by the distance calculation means, centered on the final positioning position when positioning by the positioning means is impossible The interior is predicted as the current position.

  According to the above configuration, when the positioning by the positioning unit becomes impossible, the current position prediction unit further uses the vibration detection unit and the distance calculation unit to predict the current position. The vibration detection means includes an acceleration sensor, a vibrator, and the like, and detects vibration in the vertical direction of the user who carries the apparatus. The distance calculation means obtains a moving distance by multiplying the frequency detected by the vibration detection means by a preset step length of the user. That is, normally, the acceleration sensor used for a vehicle or the like for autonomous positioning is not used for detecting acceleration in a horizontal plane, but is used for counting the number of steps of the user in the present invention. And when the positioning by the positioning means becomes impossible, the current position predicting means obtains the height from the final positioning position using the altitude measuring means, and uses the vibration detecting means and the distance calculating means, Centering on the final positioning position, the current position is predicted within the range of the moving distance from the final positioning position by the distance calculating means.

  Therefore, the current position can be predicted with higher accuracy when positioning is impossible.

  Furthermore, in the position detecting device of the present invention, the current position predicting means prohibits the accumulation of the moving distance by the distance calculating means while an altitude change is detected by the altitude measuring means. .

  According to the above configuration, when the current position predicting unit obtains the moving distance using the vibration detecting unit and the distance calculating unit, while the altitude change is detected by the altitude measuring unit, for example, from the vibration detecting unit The accumulation of the movement distance is prohibited, for example, by stopping the output of the vibration pulse or prohibiting the distance calculation means from integrating the vibration pulse.

  Therefore, even if the number of steps is counted by the user going up and down the stairs, the movement is detected as a change in height by the altitude measuring means. Therefore, the plane movement of the vibration pulse by the vibration detecting means is detected. It is possible to extract only the components related to and predict the current position when positioning is impossible.

  The position detection apparatus of the present invention further includes an azimuth detection unit, and the current position prediction unit is a detection direction by the azimuth detection unit with the final positioning position in the positioning unit as a center, and the distance calculation. The present invention is characterized in that the current position is predicted within the range of the movement distance obtained by the means.

  According to the above configuration, when the range of the current position is predicted with the final positioning position as the center, the prediction range is further narrowed down to the moving direction by using the direction detecting means such as a gyro.

  Therefore, the prediction accuracy of the current position when the positioning is impossible can be further increased.

  Furthermore, in the position detection system of the present invention, the positioning means of the terminal device carried by the user performs positioning, and the host device detects the current position of the terminal device from the positioning result notified through the communication line. In the position detection system, the terminal device is provided with an atmospheric pressure measuring unit that measures an atmospheric pressure change and transmits the measured atmospheric pressure change to the host device, and the host device receives a measurement result of the atmospheric pressure measuring unit, and the positioning device By calibrating the measurement result with the positioning result by the means, the altitude is obtained from the detected atmospheric pressure, and when positioning by the positioning means is impossible, the data near the final positioning position is obtained from the atmospheric pressure detected by the atmospheric pressure measuring means. A current position predicting means for adding the obtained altitude and predicting the current position is provided.

  According to the above configuration, the user can check the whereabouts of a child or an elderly person on the host device side by notifying the host device of the positioning result of the positioning means through a communication line such as a mobile phone network. In the position detection system used for, for example, the positioning means receives, for example, signals from a plurality of GPS satellites or signals from a plurality of mobile phone base stations, and performs positioning of the current position by triangulation or the like. If the positioning becomes impossible due to the relationship between the orbital position of the GPS satellite and the sky's outlook at the current position, or due to the condition of the obstacle from the mobile phone base station to the current position, the user Since there is a high possibility of having entered the basement, it is based on the positioning result of the positioning means in the vicinity of the final positioning position, that is, before entering the building or basement (specifically, for example, May be used for positioning result directly from the final positioning results may be such as obtaining an average value of only up to the previous positioning result several samples), predicts the current position.

  For the prediction, the terminal device is provided with an atmospheric pressure measuring means, and the host device side is provided with a current position predicting means for obtaining an altitude from the atmospheric pressure detected by the atmospheric pressure measuring means. In that case, the atmospheric pressure measuring means is affected by the change in atmospheric pressure, and the current position predicting means cannot measure the absolute altitude, and therefore the current position predicting means determines the measurement result by the positioning result by the positioning means. It is calibrated so that altitude can be obtained from atmospheric pressure. When positioning becomes impossible, the altitude obtained from the measured atmospheric pressure is added to the positioning result in the vicinity of the final positioning position to predict the current position. The positioning result and the prediction result may be synthesized and displayed on a map screen in the host device such as a monitoring center or a family home personal computer.

  Therefore, when the user enters the building or the basement as described above, in the present invention, it is only known from the final positioning result that the user has entered the building or the basement. The current position can be predicted with high accuracy when positioning is impossible.

  In the position detection device of the present invention, as described above, the positioning means receives signals from a plurality of GPS satellites or signals from a plurality of mobile phone base stations, for example, and presents at a predetermined period by triangulation or the like. In a position detecting device that measures the position, when the current position is predicted when positioning becomes impossible, the current position predicting means is detected by the altitude measuring means on the basis of the positioning result in the vicinity of the final positioning position. The calculated altitude is added to predict the current position.

  Therefore, when a user enters a building or basement, according to the present invention, it is determined from the final positioning result that only the user has entered the building or basement. Thus, the current position can be predicted accurately when positioning is impossible.

  Furthermore, in the position detection system of the present invention, as described above, the user carries the terminal device, and notifies the host device of the positioning result of the positioning means through a communication line such as a cellular phone network. In the position detection system used for confirming whereabouts of children and the elderly on the device side, the positioning means receives signals from a plurality of GPS satellites and signals from a plurality of mobile phone base stations, for example. When the current position is measured by triangulation or the like, and the positioning becomes impossible, when the host device predicts the current position, the current position predicting means is detected from the atmospheric pressure detected by the atmospheric pressure measuring means provided in the terminal device. Obtains the altitude, and the current position prediction means adds the altitude obtained from the measured atmospheric pressure to the positioning result in the vicinity of the final positioning position and predicts it as the current position.

  Therefore, when a user enters a building or basement, according to the present invention, it is determined from the final positioning result that only the user has entered the building or basement. Thus, the current position can be predicted accurately when positioning is impossible.

[Embodiment 1]
FIG. 1 is a diagram showing a system configuration of a position detection system according to an embodiment of the present invention. In this position detection system, the security terminal 1, which is a position detection device carried by the user, generally receives signals from three or more GPS satellites S1, S2, S3 every predetermined period, for example, every second. Then, positioning is performed by decoding the navigation message, and the positioning result is sent to a host such as a personal computer installed in a monitoring center or family home via the communication network 2 such as a cellular phone network every minute. The information is transmitted to the device 3, and the current position of the security terminal 1 is grasped at the monitoring center or family home. As a result, the current location of valuables can be confirmed, it can be used for searching for children and elderly people, or the surveillance center can notify the medical institution or police in response to an emergency call from the security terminal 1. As a result, it is useful for transporting users during sudden illnesses and searching for valuable items that have been stolen.

  It should be noted that in the position detection system of the present invention, when the signals from the GPS satellites S1, S2 and S3 cannot be received, the security terminal 1 is switched to autonomous positioning from that point, and the altitude is detected from the change in atmospheric pressure. It is to detect and notify the host device 3. The monitor 31 of the host device 3 plots the current position that can be measured on the map screen while the positioning from the signals from the GPS satellites S1, S2, and S3 is possible. On the other hand, if positioning becomes impossible, as shown in FIG. 1, the position P0 (final positioning position) where the user seems to have entered the building or underpass that is supposed to have entered, as shown in FIG. ) As a reference, the position of the measured altitude h (shown by hatching) is displayed as the current position.

  FIG. 2 is a block diagram showing an electrical configuration of the security terminal 1. The security terminal 1 includes a GPS reception unit 11, a calculation unit 12, an altitude measurement unit 13, a transmission / reception unit 14, a storage unit 15, and a control unit 16.

  The GPS receiving unit 11 starts tracking positioning in response to a positioning instruction from the control unit 16 and, for example, receives signals from three or more GPS satellites S1, S2, S3 as described above every second. The received navigation message is decoded by the arithmetic unit 12 to determine the current position. The positioning results are sequentially stored in the storage unit 15. On the other hand, when the transmission / reception unit 14 receives a search request from the host device 3, the control unit 16 gives a read instruction to the storage unit 15, and in response thereto, a positioning result is read from the storage unit 15, for example, every minute. The packet is transmitted from the transmission / reception unit 14 to the communication network 2.

  The search request is transmitted only at the start and end of the transmission of the positioning result, and may be omitted at every one minute transmission, and the security terminal 1 is turned on or the power switch is not operated. As long as the remaining battery level remains, positioning and transmission of positioning results may be performed. Furthermore, the positioning and positioning result transmission intervals are not limited to the above, and packet communication costs are required. Therefore, when the positioning results are not transmitted every time as described above, a plurality of positioning results are transmitted as they are. In addition, the representative value and the average value may be obtained before transmission.

  The altitude measuring unit 13 includes a barometer or the like, and measures altitude from the atmospheric pressure in the same cycle as the GPS receiving unit 11 in response to a measurement instruction from the control unit 16. The measurement result is stored in the storage unit 15 together with the positioning result. However, when the barometer is composed of the barometer, the altitude measuring unit 13 is affected by a change in atmospheric pressure, cannot measure an absolute altitude, and can detect only a relative change in altitude from a change in atmospheric pressure. Therefore, the altitude measurement unit 13 is given a positioning result from the calculation unit 12, calibrates the given positioning result as a reference altitude, and changes the atmospheric pressure due to the subsequent measurement result from the reference altitude. As a change in altitude, the absolute altitude can be measured. In the altitude measuring unit 13 using such a barometer, an altitude change of about 3 to 4 m, for example, a difference in floors can be detected.

  The communication network 2 is configured by using a mobile phone base station 21 that directly communicates with the security terminal 1 using, for example, a relay station 22, a mobile phone company switching center 23, and a fixed telephone line 24, and the measurement results. Such data is packet-communicated to the host device 3.

  In the position detection system configured as described above, in response to a search request from the host device 3, in the security terminal 1, the GPS receiving unit 11 and the calculation unit 12 which are positioning means are GPS satellites S1, S2, S3. Positioning is performed by receiving a signal from, and the positioning result is transmitted to the host device 3. At the same time, the measurement result of the altitude measuring unit 15 is calibrated by the altitude data based on the positioning result.

  If positioning by the GPS becomes impossible, the user is likely to have entered the building or the basement. Therefore, the calculation unit 12 that is also a current position predicting unit is near the final positioning position, that is, to the building or the basement. Based on the GPS positioning results before entering (the final positioning results may be used as they are, or the average value from the final positioning results to the previous positioning results for several samples may be obtained) The altitude h detected by the altitude measuring unit 13 as a measuring means is added to predict the current position. The prediction result is stored in the storage unit 15 and transmitted from the transmission / reception unit 14 to the host device 3 at a prescribed transmission timing.

  Therefore, when a user enters a building or basement as described above, in the present invention, in the present invention, only the extent of entering the building or basement was known from the final positioning result. The current position can be predicted with high accuracy when positioning is impossible. As a result, for example, when a guardman or a guardian searches for a criminal or a child, it is only necessary to search for a specific floor, and it is not necessary to search for all the floors of a high-rise building.

[Embodiment 2]
FIG. 3 is a diagram showing a system configuration of a position detection system according to another embodiment of the present invention. This position detection system is similar to the position detection system shown in FIG. 1 described above, and corresponding portions are denoted by the same reference numerals, and description thereof is omitted. It should be noted that in this position detection system, the security terminal 10 carried by the user is provided with a configuration for autonomously measuring the moving distance and the traveling direction in addition to the configuration for autonomously measuring the altitude of the security terminal 1 described above. It is that.

  Specifically, as shown in the block diagram of FIG. 4, the security terminal 10 is provided with the GPS receiving unit 11, the altitude measuring unit 13, the transmitting / receiving unit 14 and the storage unit 15 in the security terminal 1 described above, A moving distance measuring unit 17 that autonomously measures the moving distance and a traveling direction measuring unit 18 that autonomously measures the traveling direction are newly added, and the processing of the calculation unit 12a and the control unit 16a includes the above-described processing. Processing for autonomous positioning of the moving distance and the traveling direction is added to the processing of the calculation unit 12 and the control unit 16.

  The moving distance measuring unit 17 that is a distance calculating unit is composed of an acceleration sensor, a vibrator, and the like, and is set in advance to vibration detection means that detects vibration in the vertical direction of a user who carries the device, and the frequency detected by the vibration detection means. And a distance calculating means for multiplying the user's step length to obtain a moving distance. That is, normally, the acceleration sensor used for a vehicle or the like for autonomous positioning is not used for detecting acceleration in a horizontal plane, but is used for counting the number of steps of the user in the present invention. Specifically, one cycle of vibration pulses appearing as shown in FIG. 5 is counted as one step, and the moving distance is obtained by multiplying it by the step length.

  When positioning by GPS becomes impossible, the calculation unit 12a serving as the current position predicting unit sequentially determines the actual position at the specified prediction timing with the final positioning position P0 as the center, as shown in FIG. When P1 and P2 are set, the moving distance measuring unit 17 predicts the range indicated by hatching the moving distance r considering the error range to the number of steps × step length as the range of the current position by autonomous positioning.

  However, the arithmetic unit 12a responds to the output from the altitude measuring unit 13, and prohibits the accumulation of the moving distance by the moving distance measuring unit 17 while an altitude change is detected. Specifically, for example, the output of the vibration pulse from the vibration detection unit is stopped, or the distance calculation unit is prohibited from integrating the vibration pulse.

  Therefore, even if the user counts the number of steps by moving up and down the stairs and the like, the resulting movement is detected as a change in height by the altitude measuring unit 13, so that the plane of the vibration pulse in the vibration detecting means is flat. By extracting only the components related to movement, the current position can be predicted more accurately when positioning is impossible.

  The traveling direction measuring unit 18 that is an azimuth detecting unit is configured by, for example, a magnetic sensor, a gyro sensor, or a combination thereof, and when the positioning by the GPS becomes impossible, the arithmetic unit 12a that is the current position predicting unit As shown in FIG. 7, in predicting the range of the current position by autonomous positioning with the final positioning position P0 as the center, as shown in FIG. 7, the range of the prediction is set in the movement direction measured by the traveling direction measuring unit 18, as shown in FIG. squeeze. The traveling direction measuring unit 18 may be calibrated based on the positioning result by the GPS. Therefore, the range of the current position predicted by the calculation unit 12a is a range indicated by hatching in FIG. 8 with respect to the outputs from the movement distance measurement unit 17 and the traveling direction measurement unit 18.

  By further adding the output from the altitude measuring unit 13, the prediction result in the present embodiment is as shown in FIG. That is, if positioning by GPS is possible at positions P-2, P-1, and P0, and the user enters the building after passing position P0 and positioning becomes impossible, the subsequent positions P1, P2, In P3, the current position is predicted by the above-described autonomous positioning. In the example of FIG. 3, first, only the height h changes at the position P1, and during this time, even if the number of steps is counted, the moving distance r is not integrated. Similarly, only the height h changes at the position P2, and the moving distance r is not integrated. Thus, when the user moves on the floor and movement within the floor is detected at the next position P3, + θ1 and −θ2 from the center direction in the range of the movement distance r centering on the position P2 on the final positioning position P0. A fan-shaped range indicated by hatching, which is a range, is predicted as the range of the current position by autonomous positioning. The actual position is P3.

  In this way, the current position can be predicted in three dimensions with higher accuracy when GPS positioning is impossible.

  In the configuration for predicting the current position as described above, the security terminal side is provided only with a configuration for GPS reception, a sensor such as a barometer, an acceleration sensor, and an orientation sensor, and the detection results thereof are displayed. All of the data may be transmitted to the host device side, and the current position prediction calculation may be performed on the host device side. Further, the positioning method of the current position is not limited to the one using the GPS, but receives signals from a plurality of mobile phone base stations such as a CDMA mobile phone terminal device, and performs triangulation, etc. The current position may be determined by.

It is a figure which shows the system configuration | structure of the position detection system which concerns on one Embodiment of this invention. It is a block diagram which shows the electric constitution of the security terminal shown in FIG. It is a figure which shows the system configuration | structure of the position detection system which concerns on other forms of implementation of this invention. FIG. 4 is a block diagram showing an electrical configuration of the security terminal shown in FIG. 3. It is a wave form diagram which shows the output of the acceleration sensor which comprises a movement distance measurement part. It is a figure for demonstrating the prediction method of a movement distance. It is a figure for demonstrating the prediction method of a moving direction. It is a figure for demonstrating the prediction method which match | combined the said movement distance and a movement direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 10 Security terminal 2 Communication network 3 Host apparatus 11 GPS receiving part 12, 12a Arithmetic part 13 Altitude measuring part 14 Transmission / reception part 15 Storage part 16, 16a Control part 17 Traveling distance measuring part 18 Traveling direction measuring part 21 Base station 22 Relay Station 23 Exchange 24 Fixed telephone line 31 Monitor S1, S2, S3 GPS satellite

Claims (5)

In the position detection device that is carried by the user and measures the current position by positioning means for each predetermined period,
Altitude measuring means that is calibrated with the positioning results by the positioning means and measures altitude from changes in atmospheric pressure;
And a current position predicting means for adding the altitude detected by the altitude measuring means to the data in the vicinity of the final positioning position and predicting the current position when the positioning means cannot determine the position. . Vibration detection means for detecting vertical vibrations of a portable user;
A distance calculating means for obtaining a moving distance by multiplying a frequency detected by the vibration detecting means by a preset step of the user;
The current position predicting means predicts, as a current position, within a range of a moving distance from the final positioning position by the distance calculating means, centering on a final positioning position when positioning by the positioning means is impossible. The position detection device according to claim 1.   3. The position detecting device according to claim 2, wherein the current position predicting unit prohibits integration of the moving distance by the distance calculating unit while an altitude change is detected by the altitude measuring unit. It further comprises an orientation detection means,
The current position predicting means predicts, as a current position, a detection direction by the azimuth detecting means with a final positioning position in the positioning means as a center and a moving distance obtained by the distance calculating means. The position detecting device according to claim 2 or 3, characterized in that: In the position detection system in which the positioning means of the terminal device carried by the user performs positioning, and from the positioning result notified through the communication line, the host device detects the current position of the terminal device.
The terminal device is provided with atmospheric pressure measuring means for measuring a change in atmospheric pressure and transmitting it to the host device,
The host device receives the measurement result of the atmospheric pressure measurement means, calibrates the measurement result with the positioning result of the positioning means, obtains the altitude from the detected atmospheric pressure, and cannot be determined by the positioning means. A position detection system comprising: a current position prediction means for predicting the current position by adding the altitude obtained from the pressure detected by the pressure measurement means to data near the final positioning position.

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