JPH0629915A - Zone recognition system for mobile station - Google Patents

Abstract

PURPOSE:To grasp accurately a current zone in which a mobile station is located at present. CONSTITUTION:The system consists of a current position calculation means 11, a recognition means 12 and a transmission means 13, and the recognition means 12 consists of a storage means 12a and a zone discrimination means 12b. The current position calculation means 11 calculates a current position of a mobile station 10. The storage means 12a stores zone index data representing division of a zone covered by the mobile station 10 into plural areas. The zone discrimination means 12b discriminates a zone where the mobile station 10 is resident at present, that is, the current zone based on the current position and the zone index data. The transmission means 13 sends the current zone discriminated by the zone discrimination means 12b to the base station 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile station area recognition method, and more particularly to a mobile station area recognition method for notifying a base station of the current area where the mobile station is currently located.

In recent years, mobile communication for moving bodies such as automobiles, ships, trains and airplanes has been rapidly put into practical use. Generally, a mobile unit provided with communication equipment is called a "mobile station". These mobile stations include public mobile stations such as police, fire and emergency, and private mobile stations such as trains and taxis. Further, a centralized control station for controlling the current positions of a plurality of mobile stations to be managed, such as the National Police Agency and a vehicle management center, is called a "base station".

By the way, in order for the base station to make an emergency or normal call or command to the mobile station, the base station is always required to keep track of the current position of the mobile station to be managed. For example, in the event of a criminal case, it is necessary to grasp the current positions of all mobile stations in the jurisdiction in order to issue a command to the mobile stations such as police cars nearby from the place where the crime occurred.

In response to such a request, the mobile station area recognition method is a method for recognizing the current position of the mobile station for each area obtained by dividing the base station management area into predetermined areas. Conventionally, as the area recognition method of the mobile station, the area recognition method of the mobile station by a sign post and the GPS (Global Positio
ning system) is known as a mobile station district recognition method.

[0005]

2. Description of the Related Art FIG. 7 is a diagram showing an example of an area recognition system of a mobile station using a sign post. In the figure, a plurality of sign posts SP1 to SP5 are dispersedly installed at appropriate positions in an area where the mobile station M71 or the like operates.

The sign posts SP1 to SP5 are one of wireless transmitters, and constantly emit position signal radio waves. This position signal radio wave reaches a predetermined range, for example, within a radius of 400 [m] from the sign post, and such a range is generally called a "zone". For example, in FIG. 7, the zone Z1 shows the inside of a predetermined circle from the sign post SP1.

The mobile station such as the mobile station M71 receives the position signal radio wave within the zone and automatically transmits the received position signal to a base station (not shown). Base station is mobile station M7
The position signal from 1 can grasp the position and dynamics of the mobile station such as the mobile station M71.

As described above, a system in which the position signal of the mobile station such as the mobile station M71 is automatically transmitted to the base station so that the base station always keeps track of the position and movement of the mobile station is an AVM system (Automatic Vehicle Monitoring System). ) Has been put into practical use.

FIG. 8 is a diagram showing an example of a mobile station area recognition system using GPS. First, the area in which the mobile station M8 or the like operates is divided for each predetermined distance, that is, for each longitude and latitude. In the figure, the area is represented by longitudes X1 to X3 and latitude Y.
Divide by 1 to Y4. As the predetermined distances, the longitudes X1 to X3 are the distances x and the latitudes Y1 to Y4 are the distances y.
It is set for each. In this way, the area where the mobile station M8 or the like operates can be divided into six areas A1 to A6.

A GPS is mounted on each mobile station such as the mobile station M8. This GPS is a system that measures the distance from an artificial satellite to a mobile station (by measuring the propagation time using an accurate clock) using a plurality of artificial satellites whose orbital positions are known in advance, and obtains the current position. is there. At least four satellites are required to determine the three-dimensional position of the mobile station. That is, the navigation data sent from the four artificial satellites are received, and the distances from the four artificial satellites to the mobile station are calculated. This navigation data includes correction values for the satellite clock, orbit data, and the like. Then, an intersection point of spherical surfaces centered on the positions of the four artificial satellites and each having a radius of each of the above distances is obtained as the current position of the mobile station, and its accuracy is accurate within 100 [m]. Note that three artificial satellites are sufficient to obtain the two-dimensional position of the mobile station.

Thus, from the current position obtained by GPS, the above-mentioned districts A1, A2, A3, A4, A5, A6
Etc. are determined and transmitted as a position signal to a base station (not shown). The position signal is transmitted every time the mobile station M8 or the like moves by the distance x or the distance y, or at predetermined time intervals. Therefore, the base station could grasp the position and dynamics of the mobile station such as the mobile station M8 by the position signal from the mobile station M8 or the like.

[0012]

However, in the conventional area recognition system for a mobile station using a sign post, the mobile station M71 is included in the zone Z1 or the zone Z2 as shown in FIG. 7, so that the current position can be detected. Yes, but mobile station M7
There is a problem in that the mobile station located outside the zone like 2 cannot detect the current position.

Further, in the conventional area recognition system for a mobile station by GPS, in the method of transmitting a position signal according to a moving distance, as shown in FIG.
When moving from the area A2 to the area A2, a position signal is transmitted when moving a distance Δx larger than the distance x, but for example, when moving from the area A1 to the area A3, when moving a distance Δy smaller than the distance y. Since it does not transmit a position signal, the base station still knows that mobile station M8 is located in area A1. Therefore, there is a problem that the base station cannot grasp the accurate current position of the mobile station.

Further, in the conventional area recognition system for mobile stations by GPS, the method of transmitting a position signal at a predetermined time interval has a problem that the processing of the base station becomes complicated as the number of mobile stations increases. there were.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a district recognition system for a mobile station which can accurately grasp the current district where the mobile station is currently located.

[0016]

FIG. 1 is a diagram for explaining the principle of the present invention for achieving the above object. The mobile station district recognition method of the present invention comprises a current position calculation means 11, a recognition means 12 and a transmission means 13. Further, the recognition means 12 is composed of a storage means 12a and a district discrimination means 12b.

The current position calculating means 11 calculates the current position of the mobile station 10. The storage unit 12a stores the district division data obtained by dividing the area in which the mobile station 10 operates into a plurality of districts. The district discriminating means 12b discriminates the current district of the mobile station 10 from the current position of the mobile station 10 and district division data. The transmitting unit 13 transmits the current area to the base station 30.

[0018]

Based on the current position of the mobile station 10 calculated by the current position calculating means 11 and the district division data stored in the storage means 12a, the district discriminating means 12b determines the current mobile station 1
The area where 0 is located, that is, the current area is determined. When the determined current area is changed from the previously determined area, the transmitting unit 13 transmits the current area to the base station 30 as a position signal.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating the principle of the present invention and is a diagram showing an embodiment. The mobile station area recognition method of the present invention includes a mobile station 10, an artificial satellite 20, and a base station 30.
The mobile station 10 is a moving body such as an automobile, a ship, a train, and an airplane, and is provided with communication equipment. The artificial satellite 20 travels in a predetermined orbit in outer space and constantly transmits navigation data as radio waves. Although only one artificial satellite 20 is shown in the figure, at least four artificial satellites are required to accurately calculate the three-dimensional current position of the mobile station 10. The base station 30 centrally manages the plurality of mobile stations 10 for each area, and issues a command or the like to the mobile station 10 as necessary.

Further, the mobile station 10 has the present position calculating means 1
1, an antenna 11a, a recognition means 12 and a transmission means 13. The current position calculating means 11 is composed of GPS, receives navigation data transmitted from a plurality of artificial satellites 20 with an antenna 11a, and calculates the current position of the mobile station 10. The current position calculating means 11 can also calculate the moving speed and moving direction of the mobile station 10 by calculating the current position of the mobile station 10 at predetermined time intervals. The recognition means 12 is mainly composed of a processor, and the mobile station 1 calculated by the current position calculation means 11
Recognize 0 current districts. The transmission means 13 is the recognition means 1
The current area recognized in 2 is transmitted to the base station 30 as a position signal.

Further, the recognition means 12 comprises a storage means 12a and an area discrimination means 12b. Storage means 12a
Is a storage medium such as a ROM, a RAM, or a magnetic disk, and stores area division data obtained by dividing the area in which the mobile station 10 operates into a plurality of areas in advance. District discrimination means 1
2b is mainly composed of a processor, and discriminates the current area of the mobile station 10 from the current position of the mobile station 10 and the area division data.

Next, the area allocation data stored in the area allocation and storage means 12a will be described. Figure 2
It is a figure which shows an example of division into districts. First, the area in which the mobile station 10 operates is divided for each predetermined distance, that is, for each longitude and latitude. In the figure, the positions P1 to P20 are obtained by dividing by the longitudes X21 to X25 and the latitudes Y21 to Y24.
Is set. Then, among these positions P1 to P20, two or more positions are divided into a plurality of districts (blocks). In this way, the area where the mobile station 10 behaves
It can be divided into two districts B1 to B6.

In the figure, a plurality of divided districts B1
~ B6, for example, the district B1 has four positions P1 and P1.
It is an area surrounded by 2, P6 and P7. Here, when converting to data, the district B1 is set at four positions P1, P2,
It may be represented by P6 and P7, but the positions P1 and P2 are latitude Y.
21, the positions P6 and P7 are on the latitude Y22, and the position P is
1, P6 is on longitude X21, positions P2 and P7 are longitude X2
Since it is on position 2, it can be represented by two points P1 and P7 on the diagonal line. Similarly, the district B2 can be represented by diagonal positions P6 and P12.

FIG. 3 is a diagram showing the areas in a diagonal position for the plurality of areas B1 to B6.
FIG. 3 is a diagram showing an example of the district division data, and is a list of the district division data of FIG. 2 which is converted into data for storage in the storage means 12a of FIG.

In the figure, the 32nd column shows the upper left position on the diagonal line, and the 33rd column shows the lower right position on the diagonal line. Each position is composed of longitude and latitude information. Also, 31
The column is a district number, and is information transmitted as a position signal to the base station when the mobile station 10 is located within the diagonally-divided area indicated by columns 32 and 33.

FIG. 4 is a flow chart showing the processing procedure of the present invention. In the figure, the number following S indicates a step number. [S1] The position data is updated. That is, it waits until the current position of the mobile station 10 calculated by the current position calculation means 11 of FIG. 1 is updated based on the navigation data transmitted from the plurality of artificial satellites 20. [S2] It is determined whether the position data has been updated. If the position data has been updated (YES), the process proceeds to step S3, and if not updated (NO), the step S3.
Return to 1. [S3] A comparison with the district allocation data is performed. That is, the district discriminating means 12b discriminates the current district of the mobile station 10 from the current position of the mobile station 10 and the district division data calculated in step S1. [S4] Determine the district. That is, when the current position of the mobile station 10 calculated in step S1 is within the area of the area allocation data, the area is determined as the current area. [S5] It is determined whether the district has been changed. Specifically, it is determined whether or not the current area determined in step S4 has been changed from the previously determined area. If the district is changed (YES), the process proceeds to step S6, and if not changed (NO), the process returns to step S1. [S6] The district data is transmitted. That is, the transmitting means 13 in FIG. 1 transmits the current area determined in step S4 to the base station 30 as a position signal.

Therefore, the district discriminating means 12b discriminates the present district, and when the district discriminated last time is changed, the transmitting means 13 transmits the present district to the base station 30, so that the base station 30 is a mobile station. The current position of 10 can be grasped accurately. Further, since the current area is transmitted only when the previously determined area is changed, the processing of the base station 30 does not become complicated even if the number of mobile stations 10 and the like increases.

An example of the display process of the base station 30 which has received the current area or current position will be described. 5 and 6 are views showing an example of a screen display of district data,
6 is an example of a screen displayed on a display device provided in the base station 30.

FIG. 5 shows a list of taxi vehicle numbers as the numbers of the mobile stations 10 and the like located in each district based on the current districts transmitted from the mobile stations 10 and the like. Further, FIG. 6 shows a taxi vehicle as the number of the mobile station 10 or the like located on the schematic map in one of the districts displayed in FIG. 5 based on the current position transmitted from the mobile station 10 or the like. The number and moving direction are displayed.

In this way, the base station 30 can always grasp the current position, moving speed, moving direction, etc. of all mobile stations such as the mobile station 10 to be managed, so that the base station 30 can manage the mobile station 10 etc. Emergency or normal calls and orders can be made.

In the above description, the current position calculating means 11 is composed of GPS, but other navigation data such as a DECCA navigater system, an omega system and a loran (long range navigation) system. It may be configured by a system that calculates the current position based on the.

Further, the district division data stored in the storage means 12a is not limited to the use of the division division data by one kind of division as shown in FIG. It may be configured to be used sequentially for each period.

Further, the division data stored in the storage means 12a is composed of diagonally upper and lower right positions as shown in FIG. 3, but the diagonally upper right and lower left positions are used. The division data may be configured by combinations of other positions.

[0034]

As described above, in the present invention, the district discriminating means discriminates the current district from the present position of the mobile station calculated by the present position calculating means and the district division data stored in the storing means. Since the transmitting unit is configured to transmit the current area to the base station when the previously determined area is changed, the base station can accurately grasp the current position of the mobile station.

Further, since the current area is transmitted only when the previously determined area is changed, the processing of the base station does not become complicated even if the number of mobile stations increases.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a diagram showing an example of district allocation.

FIG. 3 is a diagram showing an example of district allocation data.

FIG. 4 is a flowchart showing a processing procedure of the present invention.

FIG. 5 is a diagram showing an example of a screen display of district data.

FIG. 6 is a diagram showing an example of a screen display of district data.

FIG. 7 is a diagram showing an example of an area recognition system of a mobile station using a sign post.

FIG. 8 is a diagram showing an example of an area recognition system of a mobile station by GPS.

[Explanation of symbols]

 10 mobile station 11 present position calculation means 11a antenna 12 recognition means 12a storage means 12b district discrimination means 13 transmission means 20 artificial satellite 30 base station

Claims (7)

[Claims] 1. A current position calculating means (11) for calculating a current position of a mobile station in a mobile station area recognition method for notifying a base station of the current area where the current mobile station is located.
And a storage unit (12a) for storing district division data obtained by dividing an area in which the mobile station operates into a plurality of districts, and a current district of the mobile station is determined from the current position of the mobile station and the district division data. And a recognition means (12) having a district discrimination means (12b) for outputting and a transmission means (1) for transmitting the current district to the base station (30).
3) A mobile station district recognition method characterized by having: 2. The current position calculating means (11) is configured to calculate the current position of the mobile station based on radio wave information from an artificial satellite (20). Mobile station district recognition method. 3. The area of the mobile station according to claim 1, wherein the storage means (12a) is configured to store the plurality of areas divided from the longitude and latitude information on a diagonal line. Recognition method. 4. The transmitting means (13) is configured to transmit the current area to the base station (30) when moving from another area to the current area. The mobile station district recognition method described. 5. The base station (30) is configured to display a screen of the numbers of the mobile stations for each of the current areas based on the current areas received from the mobile stations. The mobile station district recognition method according to claim 4. 6. The area recognition method for a mobile station according to claim 1, wherein the area discrimination means (12b) is configured to output the current position of the mobile station in addition to the current area. 7. The base station (30) is configured to display the current position of the mobile station on a screen based on the current position received from the mobile station. Mobile station district recognition method described in 6.