JP2000346925A - Position control system and mobile station apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a position control system that can report the precise position of a vehicle to a control center without laying a burden on the user of the vehicle and can suppress the cost to be low, and to obtain a mobile station apparatus. SOLUTION: This position control system is composed of a reference-station apparatus 1 which generates correction information so as to be transmitted, a mobile-station apparatus 2 which corrects a measuring position by a GPS on the basis of correction information D received from the reference-station apparatus 1 and which transmits correction position information E obtained as a result, and a control-station apparatus 3 which detects the position of the mobile-station apparatus 2 on the basis of the correction position information E received from the mobile-station apparatus 2. In the mobile station apparatus 2, a communication operation which receives the correction information D from the reference-station apparatus 1 and a communication operation which transmits the correction position information E to the control-station apparatus 3 are repeated alternately.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a position management system for managing the position of a mobile station device and a mobile station device used in the position management system.

[0002]

2. Description of the Related Art Conventionally, a GPS (Global Positioning System) has been used as a car navigation system, and the current position of a vehicle can be detected by receiving radio waves from a plurality of GPS satellites. However, this GPS
Since the position of the vehicle detected by the method includes an error of about 100 to 300 m, there is a problem that it is not practical especially in a densely populated area such as an urban area.

As a technique for solving such a problem and detecting the position of the vehicle with high accuracy, a so-called DGPS is used.
(Differential GPS) has been developed. here,
The DGPS measures the position of the vehicle using the GPS, receives correction information transmitted from a reference station using a mobile phone or the like connected to a car navigation system, and corrects the measurement position based on the received correction information. It is supposed to. According to this DGPS, error 5
The current position of the vehicle can be detected with high accuracy of about 10 m.

[0004]

By the way, for example, in a bus company that owns a plurality of buses, there is a demand that the management center knows the current position of each bus in operation and manages the operation status. Here, a car navigation system that can use the DGPS is mounted on a bus,
If the location of the detected bus is notified to the management center, the management center can grasp the detailed location of the bus, and thus can meet the above demand. However, for this purpose, it is necessary for the bus driver to verbally explain the current bus position to the management center by using a mobile phone, a wireless device, or the like. Therefore, there is a problem that not only the burden on the driver becomes heavy, but also the position is often unclear in the verbal explanation from the driver. Furthermore, since each bus needs to include a mobile phone for receiving correction information from the reference station and a mobile phone for notifying the management center of the corrected location information, the cost cannot be reduced. There is also.

[0005] The present invention has been made in view of the above-described circumstances, and can notify an accurate position of a vehicle to a management center without imposing a burden on a user of the vehicle. It is an object of the present invention to provide a position management system and a mobile station device that can keep costs low.

[0006]

According to a first aspect of the present invention, there is provided a position management system, comprising:
(Global Positioning System), a reference station device that generates and transmits correction information for correcting the measurement position,
A mobile station device that receives the correction information transmitted from the reference station device, and that transmits corrected position information obtained by correcting a GPS measurement position based on the correction information; and the correction position transmitted from the mobile station device. Receiving the information, comprising a management station device for detecting the position of the mobile station device based on the corrected position information, the mobile station device, a communication operation for receiving the correction information from the reference station device, And a communication operation for transmitting the corrected position information to the management station device is alternately repeated. Further, the mobile station apparatus according to claim 2 receives the correction information transmitted from the reference station apparatus, and transmits, to the management station apparatus, corrected position information obtained by correcting the GPS measured position based on the correction information. A station device,
Based on signals received from a plurality of GPS satellites, position information generating means for generating position information representing the position of the mobile station device, and position information generated by the position information generating means, received from the reference station device. A position correcting unit that generates and outputs corrected position information by performing correction based on the correction information, a communication operation for receiving the correction information transmitted from the reference station device, and a position output unit that is output by the position correcting unit. Communication means for alternately repeating a communication operation for transmitting corrected position information to the management station device.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In the following, a description will be given of an example in which the position of the vehicle is grasped at the management center using the position management system according to the present invention. Such an embodiment shows one aspect of the present invention, and does not limit the present invention, and can be arbitrarily changed within the scope of the present invention.

A: Configuration of Embodiment FIG. 1 is a block diagram showing the overall configuration of a location management system according to an embodiment of the present invention. As shown in FIG.
This position management system includes a reference station device 1 provided at a reference station, a mobile station device 2 mounted on a vehicle, and a management station device 3 provided at a management center for managing the position of the vehicle.
And a wireless packet network 4 according to the TCP / IP protocol
a, PDC (Personal Digital Cellular) mobile communication network 4b and CDMA (Code Division Multiple Acces)
s) The mobile communication network 4 including the communication network 4c, and the gateway server 5 connected to the mobile communication network 4 via the ISDN line.
It is composed of

The reference station apparatus 1 includes a communication terminal 11, a data terminal 12 connected to the communication terminal 11, and a GPS receiver 13 connected to the data terminal 12. G
The PS receiver 13 includes a GPS antenna 13a capable of receiving radio waves from a plurality of GPS satellites 6, 6,.
The reference position information P0 is obtained at regular time intervals based on the received radio waves. Here, the reference position information P0 is a GPS
This is data representing the position (latitude / longitude, etc.) of the receiver 13. Normally, the received radio waves used when obtaining the reference position information P0 are four or more radio waves extracted in descending order of signal level.

Further, the GPS receiver 13 has a built-in storage device such as a ROM, and stores the position of the GPS receiver 13 (more precisely, the position of the GPS antenna 13a) determined in advance by fixed point surveying. ) Is stored. And the GPS receiver 13
Calculates the correction information D by subtracting the latitude / longitude component of the reference fixed point position E0 from the latitude / longitude component of the reference position information P0 obtained as described above, and sequentially outputs the correction information D to the data terminal 12.

The data terminal 12 is a portable personal computer or the like capable of performing data communication via the mobile communication network 4, and has an address IP01. The data terminal 12 includes a storage device, and the GPS receiver 1
3, the correction information D supplied at regular time intervals is sequentially written into the storage device. The latest correction information D among the correction information stored in the storage device is read out in response to the correction information request transmitted from the mobile station device 2 and packetized and transmitted to the mobile communication network 4. (Details will be described later).

The communication terminal 11 is a terminal device capable of receiving a data communication service and a mobile telephone service via the mobile communication network 4, and is specifically a portable telephone, a simple portable telephone (PHS), a car telephone, or the like. is there. The communication terminal 11 includes a voice input / output unit for a user to make a voice call, a wireless unit for performing wireless communication with the mobile communication network 4, an information display unit including a liquid crystal panel, a numeric input,
In addition to an operation unit for performing information input operations such as character input, a microcomputer for controlling these units is built in. In the present embodiment, the communication terminal 11
It is connected to the data terminal 12 and communicates with the data terminal 12 such as transmitting information supplied from the data terminal 12 to the mobile communication network 4 or outputting information transmitted from the mobile communication network 4 to the data terminal 12. It plays a role in mediating the exchange of various information with the communication network 4. As described above, since the reference station apparatus 1 can perform wireless communication via the mobile communication network 4 using the communication terminal 11, it can be installed even in a place separated from the public telephone network. Therefore, for example, regardless of the distance from the public telephone network, there is an advantage that the reference station device 1 can be installed in a place such as a mountaintop where radio waves from the GPS satellites 6, 6, ... can be easily received.

The mobile station device 2 mounted on the vehicle has a GPS
It comprises a receiver (position information generating means) 21, a data terminal (position correcting means) 22, and a communication terminal (communication means) 23. The GPS receiver 21 has a GPS antenna 2 similar to the GPS receiver 13 in the above-described reference station device 1.
1a receive radio waves from a plurality of GPS satellites 6, 6,... And generate position information P at regular time intervals based on the received radio waves. Here, the position information P is
This is data representing the position of the GPS receiver 21. The position information P generated by the GPS receiver 21 is output to the data terminal 22 and sequentially written to an internal storage device.

The data terminal 22 is a portable personal computer or the like having an address IP02, and can perform data communication via the mobile communication network 4 using the connected communication terminal 23. The data terminal 22 stores an application program for alternately performing data communication with the reference station device 1 and the management station device 3 in an internal storage device. The data terminal 22 executes the application program to execute a communication operation for requesting the reference station device 1 for the correction information D,
The communication operation for transmitting the corrected position information E to the management station device 3 is alternately repeated. Here, the corrected position information E is obtained by correcting the position information P stored in the storage device in the data terminal 22 on the basis of the correction information D transmitted from the reference station device 1, and provides a more accurate mobile station. Indicates the position of the device 2. The communication terminal 23 has the same configuration as the communication terminal 11 in the reference station device 1 described above,
It plays a role in mediating the exchange of various data between the data terminal 22 and the mobile communication network 4.

The management station device 3 includes a communication terminal 31 and a data terminal 32. The communication terminal 31 has the same configuration as the above communication terminals 11 and 23, and receives the corrected position information E transmitted from the data terminal 22 in the mobile station device 2 from the mobile communication network 4 and outputs it to the data terminal 32. I do.

The data terminal 32 includes a storage device in which map information is stored, a display device such as a liquid crystal display, and a control device for controlling the operation of the data terminal 32. Then, the control device reads the map information stored in the storage device, displays the map image on the display device, and displays the position (mobile station device 2) designated by the corrected position information E on the displayed map image. (Current position of (vehicle)). The staff of the management center visually recognizes the map image and the arrow,
The position of the vehicle can be ascertained.

The gateway server 5 includes the reference station device 1,
This is a computer system for managing data communication between the mobile station device 2 and the management station device 3.
Data communication between the reference station device 1 and the mobile station device 2 and data communication between the mobile station device 2 and the management station device 3 to be described later are performed via the gateway server 5.
The gateway server 5 also has a function for interconnecting the mobile communication network 4 with another network such as the Internet.

B: Operation of Embodiment Next, the operation of this embodiment will be described. G of the reference station device 1
The PS receiver 13 uses the GPS antenna 13a to
Receive the radio waves from the S satellites 6, 6,... And generate the reference position information P0 based on the received radio waves. Further, the GPS receiver 13 reads the reference fixed point information E0 indicating the accurate position of the GPS receiver 13 from the storage device, and calculates the latitude and longitude components included in the reference fixed point information E0 from the latitude and longitude components included in the reference position information P0. Correction information D is generated by subtracting the longitude component and output to the data terminal 12. These processes are
It is performed at regular time intervals, for example, every second. The data terminal 12 sequentially writes the correction information D into an internal storage device.

On the other hand, the GPS receiver 21 in the mobile station device 2
Also, the GPS satellites 6, 6,
., Position information P is obtained based on the received radio waves, and output to the data terminal 22. This behavior is
It is performed at regular time intervals, for example, every second. The data terminal 22 sequentially writes the position information P received from the GPS receiver 21 to an internal storage device.

The data terminal 22 in the mobile station device 2
Executes the above-described application program in parallel with the above-described operation, whereby a. An operation for receiving the correction information D from the reference station device 1; b. The operation for transmitting the correction position information E to the management station device 3 is sequentially and alternately performed. Hereinafter, each of these operations will be described in detail.

A. The data terminal 22 in the mobile station device 2
Operation for Receiving Correction Information D from Reference Station Device 1 The data terminal 22 in the mobile station device 2 performs an operation for receiving the correction information D from the reference station device 1 at regular time intervals (for example, every 5 seconds). Do. Steps Sa1 to S in FIG.
a4 is an operation sequence representing the operations of the data terminal 22 and the data terminal 22 in the reference station device 1 when the data terminal 22 acquires the correction information.

When the timing for acquiring the correction information D arrives, the data terminal 22 transmits the packet specifying the address IP01 to the mobile communication network 4 via the communication terminal 23, and thereby the data terminal 12 in the reference station device 1 (Step Sa1). This line connection request is sent to the gateway server 5 via the mobile communication network 4.
And transmitted from the gateway server 5 to the reference station device 1 via the mobile communication network 4.

The reference station device 1 that has received this line connection request
When the line connection is possible, the data terminal 12 transmits a packet specifying the address IP02.
A line connection response is made to the data terminal 22 in the server (step Sa2). This line connection response is transmitted to the mobile station device 2 via the gateway server 5 and the mobile communication network 4. This enables packet exchange between the data terminal 22 in the mobile station device 2 and the data terminal 12 in the reference station device 1.

The data terminal 22 in the mobile station device 2 that has received the line connection response transmits a correction information request via the communication terminal 23 (step Sa3). In response to the correction information request received via the gateway server 5 and the mobile communication network 4, the data terminal 12 in the reference station device 1 reads out the latest correction information D stored in the storage device and transmits it to the mobile communication network 4. (Step Sa4).

The communication terminal 23 in the mobile station device 2 receives the correction information D from the mobile communication network 4 and outputs it to the data terminal 22. Upon receiving the correction information D, the data terminal 22 updates the latest position information P stored in the storage device with the correction information D.
And writes the resulting corrected position information E into the storage device (step Sa5). By correcting the position information P with the correction information D in this manner, 5 to 5
An accurate position of the mobile station device 2 can be obtained with an error of about 10 m. Typical vehicle length is 5m (private car) ~
Since it is about 10 m (bus, truck, etc.), an error of the measurement position of 5 m to 10 m is considered to be sufficiently practical.

B. The data terminal 22 in the mobile station device 2
Operation for transmitting the corrected position information E to the management station device 3 The data terminal 22 in the mobile station device 2 manages the corrected position information E generated in the above a at every fixed time interval (for example, every 5 seconds). It transmits to the station device 3. Steps Sb1 to Sb3 in FIG. 2 are performed when the data terminal 22 in the mobile station device 2 transmits the corrected position information E to the management station device 3.
Data terminal 22 and data terminal 32 in management station device 3
Is an operation sequence representing the operation of (1).

As shown in the figure, when the timing of the transmission of the corrected position information E arrives, the data terminal 22 in the mobile station device 2 transmits the packet specifying the address IP03 to the mobile communication network 4 and manages the packet. A line connection request is made to the station device 3 (step Sb1). This line connection request is transmitted to the management station device 3 via the gateway server 5 and the mobile communication network 4.

The management station 3 which has received this line connection request
When the line connection is possible, the data terminal 32 within the mobile station transmits a packet specifying the address IP02,
A line connection response is made to the data terminal 22 in the network (step Sb2). This line connection response is transmitted to the mobile station device 2 via the gateway server 5 and the mobile communication network 4. Thereby, the data terminal 22 in the mobile station device 2
Then, packet exchange with the data terminal 32 in the management station device 3 becomes possible.

When the data terminal 22 receives the line connection response transmitted from the data terminal 32 in the management station device 3,
The latest correction position information E stored in the storage device is read and transmitted to the management station device 3 (step Sb).
3). These pieces of information are received by the communication terminal 31 in the management station device 3 via the mobile communication network 4 and supplied to the data terminal 32.

The control device in the data terminal 32 writes the corrected position information E supplied from the communication terminal 31 into the internal storage device, reads out the map information stored in the storage device in advance, and reads the map information represented by the map information. Display the image on a display device. Then, on the displayed map image,
An arrow indicating the current position of the mobile station device 2 is displayed at the position specified by the latitude / longitude component of the corrected position information E (step Sb4).

The operation shown in a (steps Sa1 to Sa5) and the operation shown in b (steps Sb1 to Sb4) are alternately repeated in sequence, so that the display of the data terminal 32 in the management station 3 is repeated. The detailed position of the mobile station device 2 is sequentially displayed on the device. The staff in the management center can grasp the detailed position of the vehicle from the map and the arrow displayed in this manner.

On the other hand, when a predetermined operation is performed on the data terminal 32 in the management station device 3, the control device in the data terminal 32 transmits a plurality of pieces of correction position information E written to the storage device up to that point. All or a part of the information (that is, information indicating a position where the mobile station device 2 has passed in the past) is read.
Then, the control device displays, for example, a dot (“「 ”) at each position on the map image specified by the latitude / longitude components of the read correction position information E. That is, each position that the mobile station device 2 has passed in the past is indicated by a circle.
The staff of the management center can see this display,
It is possible to grasp the route that the vehicle has passed in the past, the operation status of the vehicle, and the like.

As described above, according to the present embodiment, the operation for receiving the correction information D from the reference station apparatus 1 and the corrected position information E obtained by correcting the position information P with the correction information D are transmitted to the management station apparatus 3. Since the operation for transmitting is performed alternately and sequentially, the driver of the vehicle can notify the management center of the detailed current position of the vehicle without performing complicated procedures. In addition, since each vehicle does not need to include a plurality of communication terminals, costs can be reduced.

The data terminal 32 of the management station device 3 may be a portable personal computer. In this way, the staff of the management center can move while carrying the data terminal 32 and the communication terminal 31, and can grasp the position of the vehicle even while moving.

In the above embodiment, the mobile station device 2 is constituted by the GPS receiver 21, the data terminal 22, and the communication terminal 23.
The S receiver may be built in and the communication terminal may execute the function of the data terminal described above. By doing so, the mobile station device 2 mounted on the vehicle can be
It can be smaller and lighter. In addition, since a cable for connecting the GPS receiver 21, the data terminal 22, and the communication terminal 23 in the above embodiment is not required, the trouble of handling such a cable can be eliminated.

In the above embodiment, the data terminal 32 in the management station device 3 holds the map information, and displays the current position of the vehicle together with the map image represented by the map information. Instead, for example, the latitude and longitude included in the corrected position information E received by the data terminal 32 may be displayed on the display device by numerical values. This eliminates the need for the data terminal 32 in the management station device 3 to hold the map information. In addition, the latitude and longitude of the position of the vehicle are stored in the data terminal 32.
Of the communication terminal 3
1 may be displayed on the information display device included in the information display device 1.

Note that the position management system according to the present invention
It can be used in various fields. Hereinafter, examples of use of the position management system according to the present invention will be listed. (1) Bus Operation Status Management In the above embodiment, the mobile station device 2 provided in the vehicle may be mounted on a route bus or the like, and the position of each bus may be grasped at the management center. The map information stored in the data terminal 32 in the management station device 3 also includes the position information of the bus stop, and the displayed map image indicates the position of the bus stop of the route bus. With such a configuration, the current bus position and the bus stop position can be grasped by the management center.
By measuring the distance to the position of the bus stop where the bus stops next, the time until the bus stops at the next bus stop can be estimated.

(2) Train Operation Management The mobile station device 2 provided in the vehicle in the above embodiment.
And a sensor capable of detecting a shock or a failure generated in the train, mounted on the train, and when the sensor detects a shock or a failure generated in the train, information indicating the fact is provided together with the corrected position information E. It is transmitted to the management station device 3. By doing so, it is possible to grasp that some kind of impact or failure has occurred in the train at the management center, and to know in detail the position of the train when the impact or failure has occurred. Can be quickly responded to.

(3) Position Management of Emergency Vehicle The mobile station device 2 provided in the vehicle in the above embodiment
Is mounted on a fire engine, a police car, an ambulance, or the like, and the management center determines the positions thereof. Then, by grasping the positions of these vehicles heading to the fire site, the accident site, and the like, the detailed position of the fire site or the accident site can be specified on the management center side.

[0040]

As described above, according to the present invention,
Since the operation for receiving the correction information from the reference station device and the operation for notifying the management station device of the corrected position information obtained by correcting the position information by the correction information are sequentially and alternately repeated, the use of the mobile station device is The user can notify the management center of the detailed position of the mobile station device without performing complicated processing. Further, since it is not necessary to mount a plurality of communication terminals on each mobile station device, the cost can be reduced.

[Brief description of the drawings]

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

FIG. 2 is an operation sequence showing an operation performed in the embodiment.

[Explanation of symbols]

1 ... reference station apparatus, 2 ... mobile station apparatus, 3 ... management station apparatus, 4 ... mobile communication network, 5 ... gateway server, 6
…… GPS satellites, 12, 21 …… GPS receivers, 12
a, 21a ... GPS antenna, 11, 22, 32 ...
Data terminals, 23, 31 ... Communication terminals.

Continued on the front page (72) Inventor Kazuyasu Yoshida 3-1-1 Kita 3-Jo Nishi, Chuo-ku, Sapporo, Hokkaido 5 NTT NTT Mobile Communication Network Company Limited (72) Inventor Kunio Sugawara Chuo, Sapporo, Hokkaido 3-1-1, Kita-ku 3-Jowest 5 NTT Hokkaido Mobile Communication Network Co., Ltd. F-term (reference) 2F029 AA02 AA03 AB07 AC02 AC14 AC18 AD03 5H180 AA01 AA12 AA16 AA20 AA30 BB04 BB05 BB15 EE15 FF05 FF13 FF22 FF24 FF25 FF27 FF33 5J062 AA01 CC07 EE04 GG02

Claims (2)

[Claims] 1. GPS (Global Positioning System)
A base station apparatus for generating and transmitting correction information for correcting the measurement position according to the above, and a correction position for receiving the correction information transmitted from the reference station apparatus and correcting the measurement position by GPS based on the correction information. A mobile station device that transmits information, and a management station device that receives the corrected position information transmitted from the mobile station device and detects a position of the mobile station device based on the corrected position information, A position management system, wherein the mobile station device alternately repeats a communication operation for receiving the correction information from the reference station device and a communication operation for transmitting the corrected position information to the management station device. . 2. A mobile station apparatus for receiving correction information transmitted from a reference station apparatus, and transmitting corrected position information obtained by correcting a GPS measurement position based on the correction information to a management station apparatus, the mobile station apparatus comprising: Position information generating means for generating position information indicating the position of the mobile station device based on a signal received from a GPS satellite; and position information generated by the position information generating means.
A position correcting unit that generates and outputs corrected position information by performing correction based on the correction information received from the reference station device; a communication operation for receiving the correction information transmitted from the reference station device; A mobile station device comprising: a communication unit that alternately repeats a communication operation for transmitting the corrected position information output by the position correction unit to the management station device.