JPH09171070A - Position measuring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To get the absolute coordinate position of moving station itself based on the information signal transmitted from base station by detecting the existing region of the moving station from a combination of base stations capable of actually communicating with a plurality of base stations. SOLUTION: Base stations 1 transmit information signal, for example, position information with a specific electric field magnitude at every base station 1. A receiver part 2, in the case a moving station exists in a partition, can receive base stations A, B, D and E. A judgment part 3, based on the combination of base stations 1 capable of receiving at present, judges the existing region of the moving station. In the case base stations A, B, D and E are capable of receiving, the relation table of the combination of the base stations 1 and existing region is read out of a memory part 6, and by referring to the relation table, it is judged that the moving station exists in the partition. A control part 7 displays 5 the judged result by overlapping, for example, a specific mark on the coordinates of map data in the specific region stored in the memory part 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning system in which a mobile station detects its own position by using a mobile communication system.

[0002]

2. Description of the Related Art In recent years, a GP has been used as a positioning system for outdoor use to detect the current position of an artificial satellite.
A positioning system called S (Global Positioning System) has been put into practical use.

For example, a navigation device used in a car or the like is a typical application example of the GPS positioning system. The basic operation of this navigation device is to convert information signals transmitted from a plurality of (at least three) artificial satellites (hereinafter referred to as GPS satellites) in an orbit around the earth into a GP.
The control unit of the navigation device receives the S receiver to detect its own coordinate position by a predetermined calculation, and displays it on the display device based on the map data stored in an external storage device such as a CD-ROM. , Generates and displays a required map on which the coordinate position of the user is superimposed.

By the way, since such a navigation device performs the position detecting operation by the information signal transmitted from the GPS satellite as described above, it cannot detect its own absolute position in the situation where the radio wave from the GPS satellite does not reach. For example, an underground passage, an underground mall, a high-rise building street, a tunnel, or the like cannot operate because a radio wave from a GPS satellite does not reach. Therefore, in order to obtain one's own coordinate position, the current coordinate position is obtained by a method of detecting the relative position using various sensors such as a vibration gyro and an optical fiber gyro.

However, the method for detecting the relative position is
Since this is a method of accumulating errors in principle, a large deviation of the coordinate position occurs depending on the usage situation. Therefore, there has been a demand for a method of simply detecting an absolute position other than GPS satellites.

[0006]

The present invention has been made in view of the above problems, and a mobile station obtains its absolute coordinate position based on an information signal transmitted from a base station using a mobile communication system. The purpose is to provide a positioning system.

[0007]

To achieve the above object, in a mobile communication system composed of a plurality of base stations and a mobile station, the mobile station actually communicates among the plurality of base stations. The existing area of the mobile station is detected based on the combination of possible base stations.

In another configuration, in a mobile communication system composed of a plurality of base stations and mobile stations, the mobile station detects the AGC amount when communicating with the base station, and at least three locations To communicate with at least three AGs
The amount of C is obtained, the distance to the base station is obtained from the amount of AGC, and the distance is calculated to detect the position of the mobile station.

[0009]

With the above-mentioned structure, it will be described with reference to FIG. For example, the positions of the base stations are A, B, D, E, ... On a square lattice point, and the communication range of each base station is adjacent to the bases in the upper, lower, left and right directions of FIG. If the distance a to the station is a circle with a radius, the mobile station (self)
Is located at the center of E and passes through points B and D.
If it is in a half area, the zone (a) can receive base stations (A, B, D, E), and the zone (b) can receive base stations (A, B, E), Zone (c)
Is a base station that can receive (A, D, E), zone (d) is a base station that can receive (D, E), and zone (e) is a base station that can receive (B, D, E). ), And the base stations that can receive the zone (f) are (B, E). Therefore, by knowing the currently receivable base station, it is possible to determine in which zone the position of the mobile station (self) is located. For example, if the currently receivable combination of base stations is (B, D, E), it can be determined that the position of the mobile station (self) is the zone (e). Also, the mobile station (yourself)
When the position of is in the other three quarters of the circle passing through the points B and D with the center at E, the zone of any of the above zones can be obtained by knowing the currently receivable base station in the same manner as above. You can determine if you are in Also, in the case of a circle other than the circle centered on E, the zone can be determined by the same algorithm.

Another configuration will be described with reference to FIGS. 4 and 5. First, in FIG. 5, when the base stations A and B can communicate with the mobile station X, the AGC amount when the mobile station X receives the base station A is a, and the AGC amount when the base station B is received is AGC.
Let the quantity be b. A curve K shown in FIG. 5 is a locus in which the value of the ratio of the AGC amounts related to the two base stations is constant a / b. Next, in FIG. 4, the mobile station X is the base station A,
If B and D can be received, the three base stations A, B and D
AG when selecting two from each and receiving each base
Detecting the amount of C, the locus where the value of the same ratio becomes constant is K1, K
2, K3. At least two loci can be determined from K1 and K2, and the position of the intersection can be determined as the existing position of the mobile station X.

[0011]

EXAMPLES Hereinafter, a positioning system according to the present invention will be described.
This will be described in detail with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a positioning system according to the present invention. 1 is multiple PHS
(Personal Handy-phon System) One of the base stations. 2 is a PHS receiver of the mobile station. 3 is
It is a determination unit that determines the existing area of the mobile station based on the combination of the base stations 1 that can be currently received. Reference numeral 5 denotes a display unit that displays the obtained own position on a map, for example. A storage unit 6 stores map information in which the position of the base station 1 is described and a relation table of combinations of the base stations 1 and existing areas. Reference numeral 7 is a control unit for controlling each unit of the mobile station consisting of 2 to 6 above.

FIG. 2 is an explanatory view of the relationship between the combination of the base stations 1 and the existing area which are received in the positioning system according to the present invention. For example, a case where a base station is installed for each block in an underground mall will be described. Base stations A, B, C, D, E, F, G, H, I, on a square grid with one side a.
Are arranged and the communication range of each base station is inside a circle whose radius is a distance a to adjacent base stations in the upper, lower, left and right directions in FIG. It becomes point symmetric at the station. For example, consider the position of the mobile station (self) in the upper left quadrant of a circle passing through points B and D centering on E. Base stations that can be received in zone (a) are (A, B,
D, E), the base stations that can be received in zone (b) are (A, B, E), and the base stations that can be received in zone (c) are (A, D, E) and zone (d). ) Is a base station that can be received in (D, E), a zone (e) can be received in (B, D, E), and a zone (f) can be received in (B, E). Is. Therefore, when the combination of base stations that can be actually received is (B, D, E),
The position where the mobile station (self) exists can be determined to be the zone (e). Also, when the position of the mobile station (self) is in the area of the other three quarters of the circle passing through the points B and D with the center at E, the figure is point symmetric, By knowing the currently receivable base station, it is possible to determine in which of the above zones it is located. Also, in the case of a circle other than the circle centered on E, the zone can be determined by the same algorithm. Particularly, in the PHS base station, the distance a of the lattice points is 10
Since it is about 0 m, each of the above zones is a narrow region within several tens of m, and it can be determined that the position where the mobile station exists is within the narrow region.

The operation of the positioning system according to the present invention is shown in FIG.
It will be described with reference to FIG. The base station 1 transmits an information signal, for example, position information in the PHS system, with a required electric field strength for each base station 1. As described above with reference to FIG. 2, the receiver 2 can receive the base station A, the base station B, the base station D, and the base station E, for example, when the mobile station exists in the section a. The determination unit 3 is based on the combination of the base stations 1 that can be currently received,
The presence area of the mobile station is determined. For example, if the base station A, the base station B, the base station D, and the base station E described above can be received, the relation table of the combination of the base stations 1 and the existing area is read from the storage unit 6, and the relation table is referred to. As a result, it is determined that the mobile station exists in the section a. The control unit 7 displays the determination result on the display unit 5, for example, by superimposing a required mark on the coordinates of the map data of the required area stored in the storage unit 6.

FIG. 3 is a block diagram of a second embodiment of the positioning system according to the present invention. The same parts as those in the embodiment of FIG. 1 are designated by the same reference numerals, and the duplicated description will be omitted. Reference numeral 8 is an AGC detector that detects the AGC amount of the received signal. Reference numeral 4 is a ratio calculation unit that calculates the ratio of the two AGC amounts, and reference numeral 9 is a position detection unit that detects the position of the mobile station from at least two of the ratios. A storage unit 6 stores map information in which the position of the base station is described.

The position detecting operation of the second embodiment of the positioning system according to the present invention will be described with reference to FIGS. 3, 4 and 5. 4 is a diagram for explaining the position detecting operation of the second embodiment of the positioning system according to the present invention, and FIG. 5 is a diagram showing a constant AGC amount ratio of the second embodiment of the positioning system according to the present invention. It is a figure which shows the locus | trajectory which becomes. Further, the same operation as that of the embodiment of FIG. The AGC detection unit 8 detects the AGC amount at the time of receiving the control information transmitted from the base station 1 for each base station 1 that can be received by the reception unit 2. For example, the amount of AGC referred to here is small when the electric field strength is large, and is large when the electric field strength is small, and is an amount that is almost inversely proportional to the electric field strength at the receiving point. Therefore, this AGC
The quantity is substantially proportional to the distance from the base station 1.

As shown in FIG. 5, when the mobile station X receives the base stations A and B, the ratio calculation unit 4 determines that the AGC amount at the time of reception by the base station A is a and that the base station B The amount of AGC at the time of reception is b, and the curve K is the AG related to the two base stations.
The ratio a / b of the C amount is calculated and the locus where the ratio value is constant is calculated. Further, in FIG. 4, when the mobile station X can receive the base stations A, B and D, the position detection unit 9 has at least two loci K calculated by the ratio calculation unit 4 as described above.
The intersection is calculated based on 1 and K2. The control unit 7
The intersection position is determined as the existing position of the mobile station X. At least three base stations 1 are received, and the intersection points of the loci can be obtained from at least three base stations 1 as described above. Further, when three or more loci are used to improve the accuracy of the intersection point position, and when a plurality of intersection points are obtained due to an error in the AGC amount, the position detection unit 9 causes the position detection unit 9 to
For example, the control unit 7 can determine the average position as the true position of the mobile station (self) by calculating the average position by the arithmetic mean of the XY coordinates.

[0017]

As described above, the present invention provides a positioning system in which a mobile station obtains its own absolute coordinate position based on an information signal transmitted from a base station using a mobile communication system. Therefore, there is an advantage that radio waves from GPS satellites do not reach, for example, it is possible to use an underground passage, an underground mall, a high-rise building street, a tunnel, or the like. Further, since it is a method of detecting the absolute position, there is an advantage that the error can be set to a required value or less.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a positioning system according to the present invention.

FIG. 2 is an explanatory diagram of a relationship between a combination of base stations 1 and an existing area, which is received in the positioning system according to the present invention.

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

FIG. 4 is a diagram illustrating a position detecting operation of the second embodiment of the positioning system according to the present invention.

FIG. 5A of the second embodiment of the positioning system according to the present invention
It is a figure which shows the locus | trajectory where the value of the ratio of GC amount becomes constant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base station 2 Reception part 3 Judgment part 4 Ratio calculation part 5 Display part 6 Storage part 7 Control part 8 AGC detection part 9 Position detection part

Claims (9)

[Claims] 1. A mobile communication system comprising a plurality of base stations and a mobile station, wherein the mobile station is present based on a combination of base stations that can actually communicate among the plurality of base stations. A positioning system characterized by detecting an area. 2. A receiving unit that receives a signal transmitted from a base station of the mobile station, a determining unit that determines an existing region of the mobile station based on a combination of receivable base stations, and an existing region of the mobile station. The positioning system according to claim 1, comprising a display unit for displaying, a storage unit for storing required data, and a control unit for controlling each unit. 3. The determination unit determines the presence region of a mobile station based on a relation table of combinations of base stations stored in the storage unit and the presence region.
The described positioning system. 4. The positioning system according to claim 2, wherein the control unit displays the map information read from the storage unit by adding the detected existence area. 5. The positioning system according to claim 1, wherein the base stations are arranged on square lattice points. 6. A mobile communication system including a plurality of base stations and a mobile station, wherein the mobile station detects an AGC amount during communication with the base station and communicates with at least three base stations. And at least three AGC amounts are obtained to obtain the distance from the AGC amount to the base station, and the distance is calculated to detect the position of the mobile station. . 7. The mobile station comprises a receiving unit for receiving a signal transmitted by a base station, and an AG for detecting an AGC amount of the received signal.
A C detection unit, a ratio calculation unit that calculates a ratio of the two AGC amounts, a position detection unit that detects the position of the mobile station from at least two ratios, and a display unit that displays the position of the mobile station. The positioning system according to claim 6, comprising a storage unit that stores map information and a control unit that controls each unit. 8. A curve having a constant ratio of the AGC amount at the time of reception is obtained for every two base stations selected from at least three base stations that can be received by the mobile station, and at least two same base stations are obtained. The positioning system according to claim 7, wherein the position of substantially the intersection of the curves is detected as the position of the user. 9. The positioning system according to claim 8, wherein an average of at least three intersection positions formed by the curves is detected as the own position.