JPH10213644A - Man location system and current position estimating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a man location system wherein an existing PHS(simple/portable telephone system) base station can be utilized as it is and position can be detected even where GPS(global positioning system) radio wave can not be received. SOLUTION: A mobile terminal device 1 comprising a GPS reception part 5A which detects a self-position with GPS radio wave and a PHS reception part 6A which communicates with a PHS base station 4B, a tracking terminal device 2 comprising a GPS reception part 5B, a PHS reception part 6B, a map data base 16, and a display part 18 which displays a position on the map, and a DGPS (differential GPS) base station device 3 which, correcting the position information from the terminal devices 1 and 2, returns a corrected position information are provided, further, a current position estimating means 11A wherein, when no GPS radio wave is received, and if a base station estimated position based on a correction position information for three or more PHS base stations currently receiving is accumulated in a PHS base station estimation position memory 10A in advance, a current position is estimated by 3-point measurement calculation with each PHS base station's base station estimation position and pseudo distance based on electric field intensity is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a man location system (or a current position estimating system) and a current position estimating method capable of ascertaining the position of a moving object using wireless communication means, and more particularly to a GPS radio wave from a GPS satellite. TECHNICAL FIELD The present invention relates to a man location system and a current position estimating method capable of detecting and specifying the position of a moving object even in a place where reception of a moving object is impossible.

[0002]

2. Description of the Related Art Conventionally, navigation systems mounted on automobiles have become widespread, and automobile location systems have been put into practical use. These navigation systems are
A global positioning system using satellites operated by the U.S. Department of Defense (usually GPS (Global POS)
This system detects the position using an artificial satellite (referred to as a GPS satellite). The U.S. Department of Defense intentionally degrades position accuracy (SA: Selective Availability).
y) has been implemented.

[0003] At present, when the SA is implemented, it is considered that the positioning accuracy by the GPS alone is within about 100 m. In order to reduce the error, the navigation system uses information on the traveling speed obtained from the rotation speed of the wheels. The position information is corrected using a geomagnetic sensor, a gas rate sensor, an optical gyro device, a map matching technology, and the like.

[0004] As a measure against SA, in order to increase the accuracy of a positioning method using GPS, DGP is used.
An S (Differential-GPS, high-accuracy global positioning system) positioning method has been proposed. That is,
In the DGPS positioning method, a GPS receiver is installed at a fixed base station whose position is known, and the difference between the measurement error between the GPS satellite and the fixed base station, the orbit information of the GPS satellite, and the true distance between the fixed base station is determined. Utilizing the information as information, the positioning error is corrected by canceling the distance error component of the propagation distance to the GPS satellite measured by the mobile station, and the positioning calculation is performed to obtain highly accurate position information (hereinafter, the position corrected by the DGPS positioning method). Information is referred to as corrected position information). The positioning accuracy according to a general DGPS positioning method is within 10 m.

On the other hand, PHS (simplified portable telephone system)
As a position detection method using the electric field intensity of the above, there are various methods described below. That is, an electric field distribution map of the PHS base station is created in advance by actual measurement, and the mobile station (slave unit) is created.
The electric field strengths of multiple base stations measured in the above are mapped on the electric field distribution map, and the position of the mobile station (child unit) is detected as the area where the corresponding isoelectric curves intersect, or the electric field strength distribution of the base station is modeled Thus, there is a method of creating an electric field distribution map without performing actual measurement and detecting the position of the mobile station (slave unit) in the same manner as described above.

As a position detection method using the electric field intensity of the PHS, the electric field intensity of each base station at the measurement point and its position information are stored in a corresponding data table, and a plurality of positions measured by the mobile station (child unit) are stored. There is a method of searching the data table for the closest combination of the electric field strength of the base station and detecting the position of the mobile station (slave) as a position corresponding to the search.

Further, a method of detecting the position of a mobile station (slave) by creating an electric field strength distribution using a neural network and learning the electric field strengths of a plurality of base stations measured by the mobile station (slave). Or, the location confirmation data of the mobile communication network is used by receiving the location data provided by the PHS operator, and the electric field strength of the mobile station (slave unit) with respect to the three base stations is measured, and the three-point survey method is used. There are methods for detecting the position of a mobile station (slave).

[0008] Various conventional mobile station position detection methods have been described above, and one of them is shown in FIG. FIG. 3 is a block diagram showing one conventional position detection method of the prior art. The self-position detection method shown in FIG. 3 is a method in which a mobile unit detects its own position by receiving radio waves from a base station. It is intended to realize a method that can detect its own position with high accuracy even in a complicated place.

Next, referring to FIG. 3, a description will be given of the above-mentioned conventional self-position detecting method. In FIG. 3, a plurality of radio base stations 31A and 31B for transmitting radio waves modulated with signals capable of identifying the respective radio base stations are installed, and the mobile station 32 receives radio waves from the radio base stations and sets a reception level. Means 34 for identifying a wireless base station, a base station information memory 35 storing the latest estimated reception level for each wireless base station, a map database 36 of road and building information, and information of a map database having a gyro. Means 37 for estimating which point on the map the maximum reception level point is from the reception level and the reception level. If it is determined that the vehicle has passed the position nearest to the base station, the current traveling position is stored in the base station information memory. Corrected by the information of the base station position, and when it is determined that the vehicle has passed the position closest to the base station, the distance from the point of the maximum reception level to the base station is estimated to determine the current position. It is provided with a positive to means 38.

[0010]

However, in the above-described various position detection methods, as a whole, it is difficult to apply the method as a man-location system instead of a vehicle-mounted system.
In position detection by PS positioning, there is a problem in position accuracy.
Even if the GPS positioning is used, when the mobile station cannot receive the GPS radio wave, there is a problem that the effect cannot be exhibited.

In the above conventional position detecting method,
The method of using the traveling speed information obtained from the rotation speed of the wheels and the geomagnetic sensor, gas rate sensor, optical gyro device, etc. is effective in mounting on a car, but is difficult to apply as a device possessed by humans. Also, the map matching technology can be applied because the vehicle is premised on traveling on a road, but there is a problem that it is difficult to apply it to humans.

Also, in the conventional position detection method using the electric field strength of the PHS, it is necessary to know the position of the PHS base station in advance, so it is difficult to apply it outdoors. Even if the method is used, there is a problem that the location data must be provided from the PHS carrier and the mobile station (slave unit) needs to be remodeled.

The present invention has been made in order to solve the above-mentioned conventional problems, and it is possible to use an existing PHS base station as it is and to detect a position even in a place where GPS radio waves cannot be received. It is an object to provide a man location system and a current position estimation method.

[0014]

SUMMARY OF THE INVENTION A man location system according to the present invention has a GPS system for achieving the above object.
GPS that detects its position by receiving radio waves from satellites
A mobile terminal device having a receiving unit and a PHS receiving unit connected to a PHS public telephone communication line, a map database including a GPS receiving unit and a PHS receiving unit, and a display unit displaying a position on the map A man location system comprising: a tracking terminal device; and a DGPS (High Accuracy Global Positioning System) base station device that corrects position information from the mobile terminal device or the tracking terminal device and returns corrected position information. The mobile terminal device and the tracking terminal device receive PHS radio waves from a plurality of PHS base stations and measure an electric field intensity;
A base station identification number acquiring means for demodulating a radio wave to acquire an identification number of the PHS base station, and transmitting the position information acquired by the GPS receiver to the DGPS base station device via the PHS public telephone communication line, returning the corrected position information. The corrected position information with high precision (hereinafter, the position information corrected by the DGPS positioning method is referred to as corrected position information) and the electric field intensity for the base station identification number obtained by the electric field intensity measuring means and the base station identification number obtaining means. The stored position information measurement memory is converted from the corrected position information and the electric field strength stored in the position information measurement memory when the position information measurement points for one PHS base station (base station identification number) become three or more. PHS base station position estimating means for performing a three-point survey operation based on the pseudo distance and estimating the position of the PHS base station, and storing the estimated position of the PHS base station. HS and the base station estimated position memory, G
If radio waves from the PS satellite cannot be received, the base station estimated positions for the three or more currently-received PHS base stations are stored in the PHS base station estimated position memory in advance. Search by station identification number,
The present invention further comprises a current position estimating means for estimating the current position by a three-point surveying operation of a pseudorange for each PHS base station converted based on the searched base station estimated position and the currently received electric field strength corresponding thereto.

[0015] The manlocation system according to the present invention can be used in an existing PHS without measuring the position of the PHS base station and obtaining the position data from the PHS operator.
By using a base station as it is and comprising a GPS receiving unit and a PHS receiving unit, there is a man-location system that provides a small device that can be carried by humans and enables location detection even in places where GPS radio waves cannot be received. can get.

BEST MODE FOR CARRYING OUT THE INVENTION

According to a first aspect of the present invention, a GPS
GPS that detects its position by receiving radio waves from satellites
A mobile terminal device having a receiving unit and a PHS receiving unit connected to a PHS public telephone communication line, a map database including a GPS receiving unit and a PHS receiving unit, and a display unit displaying a position on the map A manlocation system including a tracking terminal device and a DGPS base station device that corrects position information from the mobile terminal device or the tracking terminal device and uses the corrected position information as a corrected position information, and cannot receive radio waves from GPS satellites. In the case, when base station estimated positions based on the corrected position information for three or more PHS base stations that are currently received are stored in the PHS base station estimated position memory in advance, the base station estimated position is identified by a base station identification number. , And the pseudo distance for each PHS base station converted by the searched base station estimated position and the currently received electric field strength corresponding thereto. It is provided with a current position estimating means for estimating a current position by a three-point surveying operation, wherein the tracking terminal device displays the corrected position information of the mobile terminal device on a map. It is not necessary to measure the position of the PHS base station in advance and to provide the position data from the PHS carrier, and to provide a compact device that can be carried by humans by comprising the GPS receiver and the PHS receiver. This has the effect that the position can be detected even in places where GPS radio waves cannot be received.

According to a second aspect of the present invention, the mobile terminal device and the tracking terminal device further include an electric field intensity measuring means for receiving PHS radio waves from a plurality of PHS base stations and measuring an electric field intensity; Base station identification number acquiring means for demodulating the acquired PHS radio wave and acquiring the identification number of the PHS base station;
The electric field intensity obtained by the electric field intensity measuring means corresponding to the corrected position information obtained by correcting the position information obtained by the PS receiving section in the DGPS base station apparatus and the base station identification number obtained by the base station identification number obtaining means And the corrected position information stored in the position information measurement memory when the number of position information measurement points for one PHS base station becomes three or more, and the pseudo distance converted from the electric field strength. It includes a PHS base station position estimating means for performing a three-point survey operation to estimate the position of the PHS base station, and a PHS base station estimated position memory for storing the estimated position of the PHS base station. Even when radio waves cannot be received, when applied to a wandering elderly, a caregiver can take out the tracking terminal device to track and secure the wandering elderly. It has the effect of say.

The invention according to claim 3 of the present invention is characterized in that the D
A mobile terminal device in which a GPS base station device receives and corrects position information detected by a GPS receiver of the mobile terminal device or the tracking terminal device via a PHS public telephone communication line, and transmits the corrected position information as highly accurate corrected position information. It is returned to the tracking terminal device, and has an effect that it is possible to detect a position with high accuracy in a place where GPS radio waves can be received.

According to a fourth aspect of the present invention, the mobile terminal transmits current position information to the tracking terminal at predetermined time intervals or by a call from the tracking terminal. The tracking terminal device and the current position information of the mobile terminal device are displayed so as to be superimposed on a map, and when applied to a wandering elderly person, the caregiver takes out the tracking terminal device and positions the wandering elderly person on the map. Has the effect that it is possible to track and secure while checking.

According to a fifth aspect of the present invention, a GPS
GPS that detects its position by receiving radio waves from satellites
A mobile terminal device having a receiving unit and a PHS receiving unit connected to a PHS public telephone communication line, a map database including a GPS receiving unit and a PHS receiving unit, and a display unit displaying a position on the map A tracking terminal device, and a DGPS for correcting position information from the mobile terminal device or the tracking terminal device and returning the corrected position information as highly accurate corrected position information
In a man location system including a base station device, PHS radio waves from a plurality of PHS base stations are received, the electric field strength is measured, the received PHS radio waves are demodulated, and the PHS base station that has transmitted the PHS radio waves is transmitted. Obtain an identification number and obtain G from the mobile terminal or the tracking terminal.
The measured electric field corresponding to the corrected position information returned from the DGPS base station apparatus and the identification number of the PHS base station that transmitted the received PHS radio wave as the corrected position information with high accuracy after correcting the PS position information. Memorize the strength and 1
When the number of measurement points of the corrected position information stored for one PHS base station becomes three or more, a three-point surveying operation is performed using the corrected position information and the pseudo distance converted from the electric field intensity, whereby the PHS base station The position of the PHS base station is estimated without using the existing PHS base station as it is and measuring the position of the PHS base station in advance and receiving the position data from the PHS operator. It has the effect that it can be estimated.

According to a sixth aspect of the present invention, a GPS
GPS that detects its position by receiving radio waves from satellites
A mobile terminal device having a receiving unit and a PHS receiving unit connected to a PHS public telephone communication line, a map database including a GPS receiving unit and a PHS receiving unit, and a display unit displaying a position on the map A tracking terminal device, and D for correcting GPS position information from the mobile terminal device or the tracking terminal device and returning the corrected position information as highly accurate corrected position information.
In a man location system including a GPS base station apparatus, when the number of measurement points of the correction position information for one PHS base station becomes three or more, a three-point survey operation is performed by using the correction position information and the pseudo distance converted from the electric field intensity. , The position of the PHS base station is estimated and stored in the PHS base station estimated position memory, and when the radio wave from the GPS satellite cannot be received, the estimated base station positions for the three or more currently received PHS base stations Is stored in the PHS base station estimated position memory in advance, the base station estimated position is searched by the base station identification number, and each PHS converted by the searched base station estimated position and the currently received electric field strength corresponding thereto. The present position is estimated by a three-point survey calculation of a pseudo distance to a base station, and radio waves from GPS satellites are received. Can not urban, it has an effect that it is possible to detect the position in the valley of the city skyscrapers.

[Embodiment 1] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings, FIG. 1 and FIG. FIG. 1 is a block diagram showing a configuration of a man location system according to an embodiment of the present invention, and FIG. 2 is a flowchart showing an operation sequence (current position estimation method) of the man location system shown in FIG.

First, a configuration of a man location system according to an embodiment of the present invention will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes a mobile terminal device which detects the position of the own station and transmits the corrected position information to the tracking terminal device 2 via the PHS base stations 4A and 4B. This is a tracking terminal device that receives the position information from the terminal device 1 and displays the position of its own station and the position of the mobile terminal device 1 on a map.

Reference numeral 3 also receives the radio wave of the GPS satellite and detects its position, and corrects the position in response to a position correction request from the mobile terminal device 1 and the tracking terminal device 2. The DGPS base station apparatus, which outputs high-precision position information by canceling the distance error component of the propagation distance to the GPS satellite measured by the tracking terminal apparatus 2 and performing positioning calculation, moves with the DGPS base station apparatus 3. In order to communicate with the terminal device 1 and the tracking terminal device 2, the mobile terminal device 1 and the tracking terminal device 2 wirelessly communicate with each other, and the mobile terminal device 1 and the tracking terminal device 2 P used for positioning
HS base station.

Further, the mobile terminal device 1 includes a GPS receiver 5A for receiving radio waves of a GPS satellite, a PHS receiver 6A for transmitting and receiving data via a PHS base station, and reception of GPS radio waves in the GPS receiver 5A. PHS receiver 6A
And the transmission and reception of PHS signals performed through
Temporary storage for transmitting the position information detected by the GPS radio wave received from the GPS satellite by the GPS receiving unit 5A via the S antenna 14A and the own estimated position information estimated by the own current position estimating means 11A to the tracking terminal device 2 And a control unit 7A for controlling other units.

The mobile terminal 1 also has an electric field strength acquisition means 8A for acquiring the electric field strength from PHS radio waves received from a plurality of PHS base stations (4A, 4B,...).
And base station identification number acquiring means 9A for acquiring base station identification numbers of a plurality of PHS base stations.

The mobile terminal device 1 also stores the acquired electric field strength and base station identification number and the corrected position information corrected by the DGPS base station device 3 in a position information measurement memory 10A and a position information measurement memory 10A. PHS base station position estimating means 12A for estimating the position of the PHS base station using the obtained electric field strength and base station identification number and the corrected position information corrected in DGPS base station device 3, and a PHS base for storing the result. Station estimation position memory 13A
It is composed of

If the mobile terminal device 1 cannot receive radio waves from GPS satellites, the base station estimated positions of the three or more PHS base stations that are currently being received are determined in advance by the PHS base station.
When stored in the base station estimated position memory 13A,
The estimated position of the base station is searched by the base station identification number, and the current position is estimated by a three-point survey operation of the pseudo distance for each PHS base station converted by the searched estimated position of the base station and the currently received electric field strength corresponding thereto. Current position estimating means 11A and a GPS antenna 1 for receiving GPS radio waves
4A and a PHS antenna 15A for transmitting and receiving a PHS line.

Next, the tracking terminal device 2 performs the function of detecting the position of its own station and displaying the positions of its own station and the mobile terminal device on a map.
Receiving section 5B, PHS receiving section 6B for transmitting and receiving data via PHS base station, and GP in GPS receiving section 5B
Reception of S radio wave and PH performed via PHS receiver 6B
The transmission and reception of the S signal is controlled, the position information detected by the GPS radio wave received from the GPS satellite by the GPS receiving unit 5B via the GPS antenna 14B and the current position estimating means 1 of the self
A control unit 7 which is provided with a memory (not shown) for temporarily storing the estimated position information of its own estimated by 1B on a map and for controlling other means
B.

The tracking terminal device 2 further includes an electric field intensity acquiring means 8B for acquiring the electric field intensity from PHS radio waves received from a plurality of PHS base stations (4A, 4B,...).
And base station identification number acquiring means 9B for acquiring base station identification numbers of a plurality of PHS base stations.

The tracking terminal device 2 also stores the acquired electric field strength and base station identification number and the corrected position information corrected by the DGPS base station device 3 in the position information measurement memory 10B and the position information measurement memory 10B. PHS base station position estimating means 12B for estimating the position of a PHS base station using the obtained electric field strength and base station identification number and the corrected position information corrected in DGPS base station device 3, and a PHS base for storing the result. Station estimation position memory 13B
It is composed of

If the tracking terminal device 2 cannot receive radio waves from the GPS satellites, the base station estimated positions for the three or more PHS base stations that are currently being received are determined in advance by the PHS base station.
When stored in the base station estimated position memory 13B,
The estimated position of the base station is searched by the base station identification number, and the current position is estimated by a three-point survey operation of the pseudo distance for each PHS base station converted by the searched estimated position of the base station and the currently received electric field strength corresponding thereto. Current position estimating means 11B and a GPS antenna 1 for receiving GPS radio waves
4B and a PHS antenna 15B for transmitting and receiving a PHS line.

Further, the tracking terminal device 2 includes a map database 16 including a map to be displayed, a display unit 18 for displaying the map and the positions of the mobile terminal device 1 and the tracking terminal device 2 on the map, a map and a mobile terminal. And location means 17 for controlling to display the position of the device 1 and the position of the tracking terminal device 2 in a superimposed manner.

The DGPS base station 3 receives a GPS receiver 5C for receiving radio waves from GPS satellites, a satellite information storage memory 20 for storing GPS information, and receives position information from the mobile terminal 1 and the tracking terminal 2. Position correcting means 21 for performing position correction in response to a position correction request, mobile terminal device 1 and tracking terminal device 2 via a PHS public telephone communication line
A communication unit 19 for transmitting / receiving data to / from the
And a GPS antenna 14C for receiving radio waves.

Next, with reference to FIGS. 1 and 2, the operation of the manlocation system according to the present embodiment configured as described above will be described. First, an operation of the mobile terminal device 1 will be described with reference to FIG. Mobile terminal device 1
After being activated (step S1), the PHS receiver 6A periodically receives PHS radio waves from a plurality of PHS base stations (step S2). Base station identification number acquisition means 9
A obtains the base station identification number contained therein from the received PHS radio wave and records the obtained base station identification number in the multiple location information measurement memory 10A (step S3).

The electric field strength acquiring means 8A receives the received P
The electric field strength of the PHS base station is acquired from the HS radio wave, and the acquired electric field strengths of the plurality of PHS base stations are recorded in the position information measurement memory 10A (step S4). In the position information measurement memory 10A, the base station identification number and the electric field strength are recorded in correspondence. Thereafter, the GPS receiver 5A receives a GPS radio wave from a GPS satellite (step S5).

The process proceeds to step S6, and if the condition that positioning by the GPS radio wave is possible by receiving the GPS radio wave is satisfied, the process proceeds to step S7. The position information detected by the GPS radio wave is transmitted to the DGPS base station device 3 via the PHS base stations 4A and 4B and the PHS public telephone line,
The position information (hereinafter, referred to as corrected position information) corrected and corrected by the DGPS base station device 3 is received again, and the corrected position information is associated with the base station identification number and the electric field intensity, and the position information measurement memory is used. 10A is recorded (step S7). As described above, when GPS radio waves can be received, as described above, this corrected position information
It is possible to obtain fairly accurate current position information.

In step S8, the position information is detected by receiving the GPS radio wave, and the corrected position information whose accuracy has been improved by the correction of the position information in the DGPS base station apparatus 3 is added to one point, for example, in the PHS base station 4B. Step S
Go to 9. Therefore, the PHS base station position estimating means 12A performs a three-point survey calculation using the corrected position information stored in the position information measurement memory 10A and the pseudo distance to the PHS base station 4B converted based on the electric field strength, For example, P
The base station estimated position of the HS base station 4B is obtained and stored in the PHS base station estimated position memory 13A (step S9).
In this way, each PHS base station (4A, 4B,...)
・) The estimated position is stored.

However, in step S8, the corrected high-accuracy corrected position information is stored in one PHS base station 4A,
If the condition that three or more points are obtained for 4B is not satisfied, the process returns to step S1, and one PHS base station 4
The above series of operations is repeated until three or more correction position information with high accuracy is obtained for A and 4B.

On the other hand, if it is determined in step S6 that the GPS radio wave cannot be received and the condition that positioning can be performed by receiving the GPS radio wave is not satisfied, at least three PHS radio waves are received by the currently received or immediately preceding PHS radio wave.
It is checked whether or not the estimated base station position for the base station (4A, 4B,...) Is stored in the PHS estimated base station position memory 13A (step S10). If the condition is satisfied, the process proceeds to step S11. .

In step S11, the current position estimating means 11A uses the base station identification numbers of the PHS base stations 4A and 4B to store the base station estimated positions of the PHS base stations 4A and 4B stored in the PHS base station estimated position memory 13A. And a pseudo-range to the PHS base station 4B calculated from the electric field strength of the currently received PHS base station (for example, the PHS base station 4B) based on the estimated position of the base station by a three-point survey calculation. Estimate the position (step S1
1) Yes. The corrected position information of the current position of the mobile terminal device 1 estimated by the current position estimating means 11A is
A is temporarily stored in a memory (not shown) provided in A.

Thus, the corrected position information obtained by the mobile terminal device 1, that is, the current position information, is stored in the PHS receiving section 6A, the PHS antenna 15A and the PHS base station 4.
It is transmitted to the tracking terminal device 2 via B and 4A periodically or by a call from the tracking terminal device 2. In the tracking terminal device 2, a map database desired to be displayed is extracted from the map database 16 under the control of the control unit 7 </ b> B, and is extracted by the operation of the location unit 17.
8 is displayed.

Now, the correcting unit 7B of the tracking terminal device 2 transmits the PHS antenna 15A and the PHS receiving unit 6 from the mobile terminal device 1.
When the corrected position information of the mobile terminal 1 is received via A, the tracking terminal 2 is controlled by the location unit 17.
The position of the received mobile terminal device 1 is displayed on the map already displayed on the display unit 18 of the above, and the location of the mobile terminal device 1 is confirmed. Note that the position estimation operation of the tracking terminal device 2 itself is the same as the position estimation operation of the mobile terminal device 1 described above, and thus the description thereof will not be repeated. Also, this embodiment is not limited to hardware,
It can be realized by software.

[0044]

The man location system and the current position estimating method according to the present invention do not need to measure the position of the PHS base station in advance and receive the position data from the PHS operator, and are high in places where GPS radio waves can be received. The current position information can be detected with high accuracy, and G
The existing PHS base stations are used as they are even in the valleys of high-rise buildings in urban areas and urban areas where radio waves from PS satellites cannot be received, and the position information of at least three PHS base stations and their electric field strengths are used. High-accuracy current position information can be detected.

Also, in the man location system according to the present invention, when the man location system is applied to a wandering elderly person, the caregiver carries the tracking terminal device and positions the wandering elderly person on a map displayed on the tracking terminal device. Can be tracked and secured while confirming, and can be configured with a GPS receiving unit and a PHS receiving unit. Therefore, a small device that can be carried by a human can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a man location system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation sequence (current position estimation method) of the man location system shown in FIG.

FIG. 3 is a block diagram showing one self-position detection method of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 mobile terminal device 2 tracking terminal device 3 DGPS base station device 4A, 4B PHS base station 5A, 5B, 5C GPS receiving unit 6A, 6B PHS receiving unit 7A, 7B control unit 8A, 8B electric field strength obtaining means 9A, 9B base station Identification number acquisition means 10A, 10B Position information measurement memory 11A, 11B Current position estimation means 12A, 12B PHS base station position estimation means 13A, 13B PHS base station estimated position memory 14A, 14B, 14C GPS antenna 15A, 15B PHS antenna 16 Map Database 17 Location unit 18 Display unit 19 Communication unit 20 GPS satellite information storage memory 21 Position correction unit 22A, 22B PHS base station antenna 31A, 31B Base station 32 Moving object position detector 33 Receiver 34 Level measuring device 35 Base station information memory6 map database 37 the relative position detector 38 position correction unit 39 display unit 42A, 42B, 42C antenna

Claims (6)

[Claims] 1. A mobile terminal device comprising: a GPS receiving unit for receiving a radio wave from a GPS satellite to detect its own position; and a PHS receiving unit for connecting to a PHS public telephone communication line;
A tracking terminal device having a map database including a map to be displayed as an S receiving unit and a PHS receiving unit and a display unit for displaying a position on the map; and correcting position information from the mobile terminal device or the tracking terminal device. DGPS as correction position information
In the case of a man location system including a base station device and when radio waves from GPS satellites cannot be received, the base station estimated position based on the corrected position information for three or more PHS base stations that are currently being received is determined in advance by the PHS. When stored in the base station estimated position memory, the base station estimated position is searched by the base station identification number, and for each PHS base station converted by the searched base station estimated position and the currently received electric field strength corresponding thereto. A man location characterized by comprising a current position estimating means for estimating a current position by a three-point survey calculation of a pseudo distance, wherein the tracking terminal device displays corrected position information of the mobile terminal device on a map. system. 2. The mobile terminal device and the tracking terminal device further comprise: an electric field intensity measuring means for receiving PHS radio waves from a plurality of PHS base stations and measuring an electric field intensity; Base station identification number acquiring means for acquiring an identification number, corrected position information obtained by correcting the position information acquired by a GPS receiver in a DGPS base station apparatus, and base station identification numbers obtained by the base station identification number acquiring means A position information measurement memory for storing the electric field intensity obtained by the electric field intensity measurement means;
When the number of position information measurement points for the S base station becomes three or more, the PHS base station performs a three-point survey operation using the corrected position information stored in the position information measurement memory and the pseudo distance converted from the electric field intensity. PHS base station position estimating means for estimating the position, and PH storing the estimated position of the PHS base station
The man location system according to claim 1, further comprising an S base station estimated position memory. 3. The DGPS base station device receives and corrects position information detected by a GPS receiver of the mobile terminal device or the tracking terminal device via a PHS public telephone communication line, and obtains highly accurate corrected position information. The man location system according to claim 1 or 2, wherein the man terminal is returned to the mobile terminal device or the tracking terminal device that transmitted the data. 4. The mobile terminal device transmits current position information to the tracking terminal device at predetermined time intervals or by a call from the tracking terminal device, and the tracking terminal device transmits the current position information to the tracking terminal device and the mobile terminal device. A man location system characterized by displaying current position information superimposed on a map. 5. A mobile terminal device having a GPS receiving unit for detecting its own position by receiving a radio wave from a GPS satellite and a PHS receiving unit for connecting to a PHS public telephone communication line;
A tracking terminal device having a map database including a map to be displayed as an S receiving unit and a PHS receiving unit and a display unit for displaying a position on the map; and correcting position information from the mobile terminal device or the tracking terminal device. In a man location system including a DGPS base station device that returns highly accurate corrected position information, a plurality of PHS base station
Receiving the S radio wave, measuring the electric field strength thereof, demodulating the received PHS radio wave to obtain the identification number of the PHS base station that transmitted the PHS radio wave, and obtaining the GPS number from the mobile terminal device or the tracking terminal device. The measured electric field intensity corresponding to the corrected position information returned from the DGPS base station device as the corrected position information with high accuracy by correcting the position information and the identification number of the PHS base station that transmitted the received PHS radio wave. When the number of measurement points of the corrected position information stored for one PHS base station becomes three or more, 3 is calculated from the corrected position information and the pseudo distance converted from the electric field intensity.
A PHS base station position estimating method comprising the steps of estimating the position of a PHS base station by performing a point survey operation. 6. A mobile terminal device having a GPS receiving unit for detecting its position by receiving a radio wave from a GPS satellite and a PHS receiving unit connected to a PHS public telephone communication line;
A tracking terminal device having a map database including a map to be displayed as an S receiving unit and a PHS receiving unit, and a display unit for displaying a position on the map; and correcting GPS position information from the mobile terminal device or the tracking terminal device. And a DGPS base station apparatus that returns the corrected position information as highly accurate corrected position information, when the number of measurement points of the corrected position information for one PHS base station becomes three or more, the correction position information and the electric field strength are used. The position of the PHS base station is estimated by performing a three-point survey operation using the converted pseudo distance and stored in the PHS base station estimated position memory, and the GPS
When the radio wave from the satellite cannot be received, the base station estimated positions for the three or more currently received PHS base stations are stored in the PHS base station estimated position memory in advance.
The estimated position of the base station is searched by the base station identification number, and the current position is estimated by a three-point survey operation of the pseudo distance for each PHS base station converted by the searched estimated position of the base station and the currently received electric field strength corresponding thereto. A current position estimating method comprising the steps of: