JPH10260241A - System and method for detecting position of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To specify a floor where a vehicle is present at a parking lot having a plurality of floors and correctly detect a position, by receiving information of electric field intensities from at least three or more PHS(personal handy phone system) base stations and analyzing the information. SOLUTION: When a vehicle 100 passes a parking lot gate, a vehicle tug 114 is read. A port terminal 211 transfers a bar code information of the vehicle 100 to a vehicle management center 300. The vehicle management center 300 selects three PHS base stations near the parking lot which receive an ID information emitted from a PHS device 111. A transmitting receiving part B413 receives IDs of base stations and an electric field intensity information of the received information from the PHS device 111 and sends to a position-detecting means 412. In order to detect a position of the vehicle, for instance, a distance from one of the PHS base stations is determined by the electric field intensity of the received information from the PHS device 111 and a spherical surface with a radius of the distance from the PHS base station is plotted. An intersection of a plurality of spherical surfaces is obtained, which is decided as the position of the vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for displaying position information of a vehicle on an on-vehicle display device, and more particularly, to a vehicle equipped with a navigation system and a PHS terminal, transmitting information from the PHS terminal mounted on the vehicle. A plurality of PHS base stations, and a system and method for detecting the position of a vehicle equipped with a PHS terminal by measuring the received electric field strength.

[0002]

2. Description of the Related Art Conventionally, there is a car navigation system using a GPS (Global Positioning System) as a system for detecting a traveling position of an automobile.
In this method, a vehicle receives a radio wave from a satellite and obtains the current position of the vehicle. The vehicle receives radio waves from multiple satellites, measures the time lag of radio waves from each satellite,
The current position information of the vehicle is obtained based on this deviation. The position information to be obtained is latitude and longitude information indicating the vehicle position. The measured latitude and longitude information of the vehicle is displayed on a monitor in association with the currently running road and the like on map data obtained from a CD-ROM mounted on the vehicle.

[0003]

The above-described conventional vehicle position detection system using GPS uses radio waves from a plurality of satellites launched on the earth, and basically obtains position information by: It is limited to latitude and longitude information, that is, planar two-dimensional information. This is to develop the difference in propagation time of radio waves from multiple satellites on a two-dimensional plane,
This is because the position is detected by analysis.
Therefore, it is difficult to detect three-dimensional information, for example, the floor position of a building, using GPS. Further, even when the vehicle rotates in a predetermined narrow range, the GPS
In such a case, when measuring the propagation time of the radio wave from the satellite, a fixed directionality is not detected, and it may be difficult to detect the position. Further, it is also difficult to perform navigation using GPS in places where the reception intensity of radio waves from satellites is low, such as inside buildings and underground shopping malls.

An object of the present invention is to provide a system capable of accurately detecting a vehicle position even in a place where position detection by GPS is difficult, such as inside a vehicle building.

Further, by detecting a three-dimensional position in consideration of a height direction, for example, in a parking lot inside a building, the number of floors of the building where the vehicle is located or position information in an underground mall is accurately transmitted to the vehicle. Make it possible,
It is an object of the present invention to provide a vehicle position detection system and a vehicle position detection method for displaying this on a display device provided in the vehicle.

[0006]

In order to achieve the above object, a vehicle position detecting system according to the present invention comprises a navigation system and a PHS (Personal Handy Phone).
A plurality of PHS base stations for receiving information transmitted by the PHS terminal, a vehicle equipped with the terminal, measuring the electric field strength of transmission information from the PHS terminal, and transmitting the measured electric field strength data to each PHS base station. The position of the base station is specified based on a plurality of PHS base stations transmitted to the position detection center together with the identification data (ID) of the PHS base station and the PHS base station IDs transmitted from the plurality of PHS base stations. Multiple P
Detecting the position of the vehicle equipped with the PHS terminal based on the electric field strength data of the PHS terminal transmitted from the HS base station,
The vehicle has position detecting means for transmitting position data to the vehicle, and a display device mounted on the vehicle for displaying the vehicle position together with map information based on the vehicle position information transmitted from the position detecting means.

Further, the position detecting means in the vehicle position detecting system according to the present invention comprises at least three or more PHSs.
The position of the PHS terminal is detected by receiving the field strength information from the base station and analyzing three or more field strength information.

Further, the position detecting means in the vehicle position detecting system of the present invention uses the information received electric field strength information from the PHS terminals received by the PHS base stations at three or more different positions to determine the distance from each PHS station. Is calculated,
Using the calculated distance as a radius, three or more spheres centered on each PHS base station position are drawn, and a PHS terminal position is detected by obtaining an intersection of the plurality of spheres.

A vehicle in the vehicle position detection system according to one embodiment of the present invention is equipped with a navigation system based on a GPS (global positioning system), and provided that the frequency of signal reception by the GPS decreases.
It has a switching device for performing system switching from GPS to PHS terminal.

Further, the vehicle in the vehicle position detecting system according to one embodiment of the present invention has a switch means of the PHS terminal and a gate detecting means for detecting the entry of the vehicle into the parking gate, and the vehicle enters the parking gate of the vehicle. The switch is turned on on condition of detection.

Further, the vehicle in the vehicle position detecting system according to one embodiment of the present invention has a switch means of a PHS terminal.
A signal is transmitted from the vehicle management center to the vehicle, and the switch is turned on by the transmitted signal.

Further, the vehicle in the vehicle position detection system according to one embodiment of the present invention is equipped with a GPS navigation system, and the vehicle transmits a signal from the vehicle management center to the vehicle by identifying the vehicle identification tag at the parking gate. Then, by turning on the switch means of the PHS terminal by the transmission signal and turning off the GPS device,
It has a switching device for switching the system.

In the vehicle position detecting system according to one embodiment of the present invention, a bar code for identifying a vehicle number is recorded on the body of the vehicle, and a bar code reading sensor is installed at the parking lot gate. The bar code is read by a reading sensor.

Further, the vehicle in the vehicle position detecting system according to one embodiment of the present invention has a wireless tag for identifying a vehicle number, and a tag identifying means for identifying the wireless tag is installed at a parking lot gate, and a wireless tag is provided. Vehicle identification is performed by the tag.

In the vehicle position detecting system according to one embodiment of the present invention, an identification code for identifying a vehicle number is recorded on a body of the vehicle, and an image identification means is provided at a parking lot gate, and an image of the identification code is provided. Vehicle identification is executed by reading by the identification means.

Further, the PHS terminal in the vehicle position detecting system according to one embodiment of the present invention is characterized in that it is turned on and automatically transmits a position detecting request signal.

A vehicle position detecting method according to the present invention is a vehicle position detecting method for detecting a vehicle position in a parking lot of a vehicle equipped with a navigation system and a PHS terminal, wherein the plurality of PHS base stations installed near the vehicle include: Receiving information transmitted by the PHS terminal;
Measuring a field strength of transmission information from the PHS terminal in the plurality of PHS base stations, and transmitting the measured field strength data to the position detection center together with identification data (ID) of each PHS base station; A PHS terminal based on the PHS base station ID transmitted from the PHS base station, and based on the PHS terminal field strength data transmitted from the plurality of PHS base stations whose positions have been specified. Detecting the position of the vehicle equipped with the vehicle by the position detecting means, transmitting the detected position data to the vehicle from the position detecting means, and the vehicle position based on the vehicle position information transmitted from the position detecting means On the display device mounted on the vehicle together with the map information.

Further, the vehicle position detecting step in the vehicle position detecting method according to the present invention includes receiving the electric field intensity information from at least three PHS base stations and analyzing the three or more electric field intensity information to determine the position of the PHS terminal. Is detected.

In the vehicle position detecting method according to the present invention, the distance from each PHS station is determined based on information received electric field strength information from the PHS terminals received by PHS base stations at three or more different positions. Is calculated,
Using the calculated distance as a radius, three or more spheres centered on each PHS base station position are drawn, and a PHS terminal position is detected by obtaining an intersection of the plurality of spheres.

Further, the vehicle in the vehicle position detecting method according to one embodiment of the present invention is equipped with a GPS navigation system, and executes a system switch from GPS to a PHS terminal on condition that the frequency of receiving GPS signals decreases. I do.

In the vehicle position detecting method according to one embodiment of the present invention, the vehicle has a switch means of the PHS terminal and a gate detecting means for detecting the entry of the parking gate to the vehicle. The switch is turned on on condition of detection.

Further, in the vehicle position detecting method according to one embodiment of the present invention, the vehicle has a PHS terminal switch means,
A signal is transmitted from the vehicle management center to the vehicle based on the identification of the vehicle identification tag at the parking lot gate, and the switch is turned on by the transmitted signal.

In a vehicle position detecting method according to an embodiment of the present invention, a vehicle is equipped with a GPS navigation system, and a signal is transmitted from a vehicle management center to a vehicle by identifying a vehicle identification tag at a parking lot gate. The method further comprises a step of switching the system by turning on the switch means of the PHS terminal and turning off the GPS device by the transmission signal.

The PHS terminal in the vehicle position detecting method according to one embodiment of the present invention is characterized in that the PHS terminal is turned on and automatically transmits a position detection request signal.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is a vehicle position detecting system using a PHS (Personal Handy Phone System). Currently, the density of PHS base stations installed in urban areas is very high, and one PHS base station covers an area with a radius of about 100 m, and a cover area that partially overlaps this cover area. Are formed so that adjacent PHS base stations are formed. Therefore, in an urban area, a communicable area is set almost all over by a large number of PHS base stations. Also, many PHS base station antennas have been installed in underground shopping malls, inside buildings, and the like, and the communicable area of PHS is rapidly expanding.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining the general outline of this system. The vehicle 100 enters the parking lot 200 to the parking lot 200
After passing through 10, the vehicle is parked in a predetermined space in the parking lot. The parking lot 200 is a parking lot building having a whole number of floors (four floors in FIG. 1) as a parking space. In the vicinity of the parking lot, a plurality of PHS base stations 401, 402, 4
03,404 are installed. In the following description, a parking lot will be described as an area where vehicle position detection by PHS is performed. However, the present invention can be executed in a place where vehicle position detection by a general navigation system such as GPS is difficult. However, the present invention is not limited to application in a parking lot.

FIG. 2 shows a diagram of the vehicle 100 and the parking gate 210 of the present invention. The vehicle 100 has a tag including a barcode 114 on the vehicle body. The bar code 11 of the vehicle 100 is provided at the entrance gate 210 of the parking lot.
4 is installed. When the vehicle 100 passes through the parking gate 210, the sensor 2
12 reads the bar code 114 of the vehicle body. The bar code 114 is a vehicle No. which is an identification number of the vehicle. And the read information is transmitted to the vehicle management center via the parking lot port terminal.

Although the vehicle identification tag uses a bar code in this embodiment, another method, for example, a card in which a predetermined vehicle identification ID is registered, for example, a magnetic card or an IC card is inserted at the entrance of the parking lot. Vehicle identification may be performed by inserting the card and reading the card with a card reader installed at the parking lot gate. Alternatively, a configuration may be employed in which a wireless tag is provided in a vehicle and the wireless tag is read at a gate. Further, a configuration may be adopted in which an image identification device is installed at the gate and the vehicle is identified by image recognition of the vehicle. Further, it is also possible to adopt a configuration in which information including vehicle identification data is transmitted from the vehicle and received by the port terminal.

FIG. 3 is a block diagram showing one embodiment of the present invention. The vehicle 100 has a PHS device 111 and a display device 112 mounted thereon, and further has a GPS device 113 for receiving GPS navigation on a general road or the like. When the vehicle 100 passes through the parking gate 210 as shown in FIG. 2, the tag of the vehicle is read at the parking gate, and the vehicle is identified. Here, a case where a barcode is used will be described as an example. Vehicle 1
00 read from the bar code 114 of the vehicle No. 00. Is sent to the port terminal 211 of the parking lot 200. The port terminal 211 transfers the barcode information of the vehicle to the transmission / reception unit 311 of the vehicle management center 300.

In the vehicle management center 300, the data analysis unit 312 uses the vehicle information in the vehicle table 313 to determine the vehicle number. Is analyzed to confirm that the vehicle is a vehicle registered in the vehicle management center. When it is confirmed that the vehicle is a vehicle registered in the vehicle management center, the vehicle position is detected, and a vehicle position detecting step for transmitting the detected position to the vehicle is started. Vehicle management center 300
First, in order to manage the PHS base station near the parking lot 200 and request the position detection center 400 that detects the vehicle position to provide the position information of the vehicle 100,
Of the PHS device 111 is transmitted. In the position detection center 400, the PHS device 111 mounted on the vehicle 100
3 near the parking lot receiving the ID information transmitted from
A PHS base station at each location, for example, the PHS base stations 401, 402, and 403 shown in FIG. 1 is selected, and base station IDs from the PHS base stations 401, 402, and 403 and reception from the PHS terminal device 111 of the vehicle are selected. The transmission / reception unit B413 receives the electric field strength information of the information from each PHS base station, and sends the received information to the position detection unit 412.

The position detecting means 412 detects the position of the PHS terminal based on the position information of each PHS base station and the electric field strength information. For position detection, for example, a distance from one PHS station is determined based on the electric field strength of information received from the PHS terminal, and based on the distance information, a spherical surface whose radius is the distance from the PHS base station is drawn. . As a result, a plurality of Ps based on distance information from a plurality of PHS stations are obtained.
A sphere centering on the HS base station is formed, and the intersection of these spheres is determined as the position of the vehicle on which the PHS terminal is mounted. The vehicle position information thus obtained is sent to the transmission / reception unit 311 of the vehicle management center 300 via the transmission / reception unit A411 of the position detection center 400, and further transmitted to the parking lot 2
It is sent to the PHS device 111 mounted on the vehicle 100 via the port terminal 211 of 00. PHS device 1 mounted on vehicle
11 displays the vehicle position information on the display device 112, for example, the blinking spot.

The vehicle position information may be transmitted from the position detection center 400 to the vehicle management center 300 together with the map information. Alternatively, the information transmitted from the position detection center 400 to the vehicle management center 300 is only position information as XYZ coordinates corresponding to longitude, latitude, and height, and this information is stored in the parking lot table 314 of the vehicle management center 300. May be transmitted to the vehicle as data processed into more detailed information in association with the parking lot position and each floor height information stored in the vehicle. Further, as in the embodiment shown in FIG. 4 described later, the vehicle position information detected by the position detection center 400 is directly transmitted from the PHS base station to the vehicle P / P without passing through the vehicle management center 300 and the port terminal.
It is also possible to transmit to the HS device.

The vehicle 100 having received the vehicle position information is stored in a ROM 116 such as a CD-ROM mounted on the vehicle.
A detailed view of the parking lot is taken out from the vehicle, and the vehicle position is displayed in the detailed view of the parking lot by, for example, blinking.

The position of the vehicle 100 is calculated as not only two-dimensional information but also three-dimensional information. Each PHS
The position information where the base station is installed is generated as information including not only two-dimensional information of longitude and latitude but also the height direction. Therefore, as described above, the received field strength information from the PHS terminal received by each PHS base station can be expressed as a sphere instead of a plane circle centered on the base station. The distance information between the PHS base station and the PHS terminal represented by the sphere is collected from a plurality of PHS base stations, and the PHS terminal position can be obtained as information including the height direction by superimposing the information. .

The three-dimensional position information thus obtained is transmitted to the vehicle, and the correct vehicle position is displayed on the display. For example, when a vehicle is parked in a four-floor parking lot building as shown in FIG. , By obtaining the height data of each floor of the parking lot recorded in the parking lot table, the floor where the vehicle is currently located is specified, and this is transmitted to the PHS device 111 of the vehicle via the port terminal 211. Send. The PHS device 111 takes out the parking lot floor map from the ROM 116 based on the obtained parking lot floor information and displays it on the display device. At this time, for example, “1st Floor”, “2nd Floor”
Alternatively, the parking lot floor map may be displayed together with characters such as "or".

When the vehicle 100 enters the parking lot, the vehicle 100
It is necessary to turn on the switch of the S device. However, when the vehicle is equipped with a navigation system based on GPS (Global Positioning System), the switching device 115 reduces the frequency of receiving GPS signals. And automatically switches the system from the GPS to the PHS terminal.

Alternatively, the vehicle may be provided with means for detecting the passage of the parking lot gate, and the PHS mounted on the vehicle may be turned on when entering the parking lot on condition that the passage of the gate is detected. The detection of the passage through the gate is achieved by transmitting and receiving a predetermined signal between the gate and the vehicle.

Further, by reading the bar code when the vehicle enters the parking lot gate, the switch of the PHS device 111 mounted on the vehicle is turned on by the signal transmitted from the port terminal.
You may comprise so that it may be. When the vehicle uses the GPS device 113 outside the parking lot, the signal is transmitted from the port terminal 211 so that the vehicle switching device 11 is used.
5 from the GPS device 113 to the PHS device 111
A switching operation may be performed. In such a setting, when the vehicle leaves the parking lot, the tag of the vehicle is read at the parking lot exit gate as well as the entrance, and the PH is read.
A signal is transmitted from the port terminal to the vehicle so that the S device 111 is turned off or the GPS device 113 is switched from the PHS device 111.

FIG. 4 shows another embodiment of the present invention. FIG.
Is composed of a vehicle 100, a position detection center 400, and a plurality of PHS base stations 401, 402, and 403. In this embodiment, the PHS device 11 of the vehicle is used.
1 directly transmits information to the position detection center 400 via the PHS base station, and makes a request for position detection. PHS terminal 11
The position detection center 400 receiving the position detection request from
Identify three or more PHS base stations 401, 402, 403 that have received the PHS terminal transmission information,
From the position of each PHS base station and the field strength information measured at each PHS base station as described in the embodiment of FIG.
The position of the vehicle 100 on which the HS terminal 111 is mounted is detected by the position detecting means 412. The detected vehicle position information is transmitted to the vehicle via the transmission / reception unit C415 and the PHS base station, and is displayed on the display device of the vehicle.

In this embodiment, in the case of a vehicle using another navigation system such as the GPS device 113, for example, the PHS is transmitted from the GPS by passing through a parking gate.
The PHS device may be configured to simultaneously transmit a position detection request signal to the position detection center when switching to PHS is performed when switching to PHS is performed or when switching to PHS is performed due to a decrease in GPS signal reception frequency. By executing the position detection request at the same time when the PHS device is turned on in this way, it is possible to enter the area where the position detection by the GPS function is difficult and to receive the position detection service by the PHS at the same time.

As described above, the present invention provides the GP
It can be executed in places where it is difficult to detect a vehicle position by a general navigation system such as S, and is not limited to application in a parking lot.

[0042]

As described above, according to the present invention, the position of a vehicle in a parking lot building or the like can be detected by using the PHS, and the position information including the height direction can be generated. Therefore, for example, in a parking lot having a plurality of floors such as a parking lot building, it is possible to accurately specify the floor where the vehicle is located, and it is possible to accurately detect the position of the vehicle.

[Brief description of the drawings]

FIG. 1 is a diagram showing a system concept of an embodiment of the present invention.

FIG. 2 is a diagram showing a vehicle and a parking lot gate according to the embodiment of the present invention.

FIG. 3 is a block diagram of a system according to an embodiment of the present invention.

FIG. 4 is a block diagram of a system according to another embodiment of the present invention.

[Explanation of symbols]

 100 vehicle 111 PHS device 112 display device 114 barcode tag 210 parking lot gate 211 port terminal 212 sensor 300 vehicle management center 311 transmission / reception unit 312 data analysis unit 313 vehicle table 314 parking lot table 400 position detection center 411 transmission / reception unit A 412 position Detecting means 413 Transmission / reception unit B 415 Transmission / reception unit C 401, 402, 403, 404 PHS base station

Claims (19)

[Claims] 1. Navigation system and PHS
(Personal handy phone) A vehicle equipped with a terminal, and a plurality of PHSs for receiving information transmitted from the PHS terminal
A base station that measures the electric field strength of the transmission information from the PHS terminal, and stores the measured electric field strength data in each PHS
A plurality of PHS base stations transmitting to the location center together with base station identification data (ID); and a PHS base station I transmitted from the plurality of PHS base stations.
D, the position of the PHS base station is specified, and the PH transmitted from the plurality of PHS base stations whose positions are specified is determined.
Position detecting means for detecting a position of a vehicle equipped with the PHS terminal based on electric field intensity data of the S terminal, and transmitting the detected position data of the vehicle to the vehicle; and a vehicle transmitted from the position detecting means. And a display device mounted on the vehicle for displaying the vehicle position together with the map information based on the position information. 2. The method according to claim 1, wherein the position detecting means receives the electric field strength information from at least three or more PHS base stations and detects the position of the PHS terminal by analyzing the three or more electric field strength information. The vehicle position detection system according to claim 1, wherein 3. The position detecting means calculates a distance from each PHS station based on information received electric field strength information from the PHS terminal received by PHS base stations at three or more different positions, and the calculated distance is calculated. 3. The vehicle position according to claim 2, wherein three or more spherical surfaces centered on each PHS base station position are drawn with the distance as a radius, and a PHS terminal position is detected by obtaining an intersection of the plurality of spherical surfaces. Detection system. 4. The navigation system according to claim 1, wherein the navigation system is a GPS.
2. The navigation system according to claim 1, wherein the navigation system is a navigation system based on (Global Positioning System), and further includes a switching device that executes system switching from GPS to a PHS terminal on condition that the frequency of signal reception by the GPS decreases. Vehicle position detection system. 5. The vehicle according to claim 1, wherein the vehicle is a PHS terminal switch means,
2. A vehicle position according to claim 1, further comprising a gate detecting means for detecting a vehicle entering the parking gate, wherein the switch is turned on on condition that the vehicle enters the parking gate. Detection system. 6. The vehicle has a switch means of a PHS terminal, a signal is transmitted from the vehicle management center to the vehicle by the identification of the vehicle identification tag at the parking lot gate, and the switch is turned on by the transmission signal. The vehicle position detection system according to claim 1, wherein the system has a configuration. 7. The vehicle is equipped with a GPS navigation system, and transmits a signal from the vehicle management center to the vehicle according to the identification of the vehicle identification tag at the parking lot gate, and switches the PHS terminal based on the transmission signal. The vehicle position detection system according to claim 1, further comprising a switching device that switches a system by turning on the GPS device and turning off the GPS device. 8. A bar code for identifying a vehicle number is recorded on the body of the vehicle, a bar code reading sensor is installed at a parking lot gate, and vehicle identification is executed by reading the bar code by the reading sensor. The vehicle position detection system according to claim 1, wherein 9. The vehicle has a wireless tag for identifying a vehicle number, a tag identifying means for identifying the wireless tag is installed at a parking lot gate, and the vehicle identification is performed by the wireless tag. The vehicle position detection system according to claim 1, wherein 10. An identification code for identifying a vehicle number is recorded on a body of the vehicle, an image identification means is installed at a parking lot gate, and vehicle identification is executed by reading the identification code by the image identification means. The vehicle position detecting system according to claim 1, wherein 11. The vehicle position detection system according to claim 1, wherein the PHS terminal is turned on and automatically transmits a position detection request signal. 12. Navigation system and PHS
In a vehicle position detection method for detecting a vehicle position in a parking lot of a vehicle on which a terminal is mounted, a plurality of PHS base stations installed near a position where the vehicle is located, receiving information transmitted by the PHS terminal, Measuring a field strength of transmission information from the PHS terminal at a plurality of PHS base stations, and transmitting the measured field strength data together with identification data (ID) of each PHS base station to a position detection center; PHS base station I transmitted from the plurality of PHS base stations
D, the position of the base station is specified, and the position of the vehicle equipped with the PHS terminal is detected based on the electric field intensity data of the PHS terminal transmitted from the plurality of PHS base stations whose positions are specified. Means for detecting a vehicle position detected by the means; transmitting the detected vehicle position data to the vehicle from the position detecting means; and a vehicle position based on the vehicle position information transmitted from the position detecting means together with map information. Displaying the information on a display device mounted on the vehicle. 13. The method according to claim 13, wherein the vehicle position detecting step includes at least three steps.
13. The vehicle position detecting method according to claim 12, wherein the position of the PHS terminal is detected by receiving electric field intensity information from a PHS base station at a location and analyzing three or more electric field intensity information. 14. The vehicle position detecting step according to claim 1, wherein said PHS base stations at three or more different positions receive said PHS base stations.
According to the information reception electric field strength information from the HS terminal, each PHS
Calculating a distance from the station, and using the calculated distance as a radius,
Draw three or more spheres centered on each PHS base station position,
13. The vehicle position detecting method according to claim 12, wherein a PHS terminal position is detected by obtaining an intersection of the plurality of spherical surfaces. 15. The vehicle according to claim 1, further comprising a step of performing a system switch from a GPS to a PHS terminal on condition that the GPS signal reception frequency decreases. A vehicle position detection method according to claim 12. 16. The vehicle has a switch means of a PHS terminal and a gate detection means for detecting a vehicle entering a parking gate, and turns on the switch on condition that the vehicle enters a parking gate. Claim 1 characterized by the following:
2. The vehicle position detection method according to 2. 17. The vehicle has a switch means of a PHS terminal, a signal is transmitted from the vehicle management center to the vehicle by the identification of the vehicle identification tag at the parking lot gate, and the switch means is turned on by the transmission signal. 13. The method according to claim 12, further comprising the steps of: 18. The vehicle is equipped with a GPS navigation system, and transmits a signal from the vehicle management center to the vehicle based on the identification of the vehicle identification tag at the parking lot gate, and switches the PHS terminal based on the transmission signal. The vehicle position detecting method according to claim 12, further comprising a step of switching a system by turning on the GPS device and turning off the GPS device. 19. The vehicle position detecting method according to claim 12, further comprising the step of automatically transmitting a position detection request signal on condition that the switch is turned on.