JP2001245335A - Positioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a positioning on system that can inform a mobile station user or a 3rd party of accurate position information. SOLUTION: The positioning system is characterized in the provision of positioning that stores a positioned result obtained by calculating the position of a mobile station and detected results obtained before another position detected result above and that compares the positioning result with each of the detected results obtained before that to calculate a moving direction of the mobile station and further compares the detected result with a traveling direction of the mobile station obtained by estimating the traveling direction of the mobile station on the basis of the calculation result of the moving directions of the mobile station in order to detect an abnormal detection result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a position detecting system used for detecting the position of a mobile station carried by a person.

[0002]

2. Description of the Related Art A plurality of radio base stations are installed in an urban area, a mobile station receives a radio signal including an identification code transmitted from the radio base station, and based on the identification code and the reception level, a mobile station receives a radio signal. A position detecting device for detecting a current position is known. In general, in such a position detecting device, the mobile station to be detected transmits to the position registration database installed on the network of the mobile communication system that the mobile station to be detected is under the control of the wireless zone of the nearest wireless base station. Then, it is registered in the database as the location information of the mobile station.

The user of the mobile station to be detected or a third party can directly or indirectly inquire the database of the location information of the mobile station to be detected.

Further, as disclosed in Japanese Patent Application Laid-Open No. H11-178041, a radio base station having the next highest reception level in a zone of a radio base station having the highest reception level is utilized by using a plurality of radio base stations. Assuming that the mobile station exists in the direction in which the station is installed, the area is made smaller than the wireless zone of the wireless base station, and the mobile station uses the direction in which the wireless base station with the third or higher reception level is installed. There has been proposed a position detection device that limits the area where the user exists.

Further, as disclosed in Japanese Patent Application No. 10-192102 (not disclosed at the time of filing of the present application), a radio signal is obtained from reception levels of radio signals from a plurality of radio base stations and positional information of the radio base stations contained in the radio signals. The signal propagation distance is calculated, the position of the mobile station is calculated from the derived distances from the plurality of radio base stations, and the calculation result is used as the position where the mobile station exists, and the position between the plurality of radio base stations is calculated. A position detection system using a weight calculation method for performing detection has been proposed.

Further, as in Japanese Patent Application No. 11-225505 (not disclosed at the time of filing of the present application), the maximum moving speed is stored in advance, and the position detection result is estimated from the maximum moving speed and observed last time. A position detection device has been proposed in which, when the distance from the position detection result is equal to or longer than a movable distance, the position detection result is determined to be an abnormal detection result, and the detection result is corrected.

[0007] These conventional position detecting devices will be described with reference to FIGS. 9 to 17. In the drawings, the same portions are denoted by the same reference numerals and description thereof will be omitted.

FIG. 9 is a conceptual diagram of the first prior art. Reference numerals 13 and 14 are radio base stations, and reference numeral 17 is a reference numeral 18.
The user carries the mobile station.

In particular, reference numeral 13 denotes a radio base station near the user indicated by reference numeral 17, and reference numerals 15 and 16 denote respective radio zones of the radio base stations denoted by reference numerals 13 and 14. Reference numeral 19 denotes a communication network, and reference numeral 20 denotes a location registration database. In mobile communication, the position of a wireless base station near a mobile station is registered as a mobile station position in a database in a network in order to efficiently perform communication processing such as calling. Position detection is performed by extracting the registration data. Therefore, the unit of the position accuracy of the mobile station is the wireless zone.

FIG. 10 is a conceptual diagram of a second prior art,
It is the figure which looked down on the radio system from the top. Symbols 21 to
Reference numeral 23 denotes a wireless base station, and reference numeral 24 denotes a wireless zone of the wireless base station 21. The radio base station having the highest reception level in the mobile station is the radio base station 21, the radio base station having the second highest reception level is the radio base station 22, and the radio base station having the third highest reception level is the radio base station. 23.
At this time, it is expected that the mobile station exists in the wireless zone 24 where the maximum reception level is obtained. Further, since the wireless base station having the second highest reception level is the wireless base station 22, the mobile station is expected to be in the area 25.
Further, since the wireless base station having the third highest reception level is the wireless base station 23, the mobile station is considered to be in the area 26. Thus, position detection is performed by dividing the inside of the wireless zone.

FIG. 11 is a conceptual diagram of a third prior art.
FIG. 3 is a diagram illustrating propagation characteristics of a wireless signal as viewed from a side. Code 27
And 28 are radio base stations, and 31 is a mobile station. Reference numeral 29 denotes radio signal propagation data from the radio base station 27, and reference numeral 30 denotes radio signal propagation data from the radio base station 28.

A reception level from the radio base station 27 received by the mobile station 31 is A, and a reception level received from the radio base station 28 is B. The reception level ratio is obtained as F (A) and F (B) by the function F () of the propagation loss equation. The position of the mobile station 31 is detected using the ratio and the positions of the wireless base stations 27 and 28.

In the third prior art, the radio base stations 27 and 28 are buried and installed in the ground, so that the reception level near the radio base stations 27 and 28 and the position slightly away from the radio base stations 27 and 28 are improved. , The level difference from the reception level can be increased. Therefore, the ratio between F (A) and F (B) can be increased, and highly accurate position detection can be performed.

FIG. 12 is a block diagram of a third prior art apparatus, and FIG. 13 is a flowchart showing the operation of the third prior art. A wireless signal is input from the input (INPUT) shown in FIG. The reception level and the modulation signal received by the wireless signal reception / demodulation unit 32 are obtained. Based on the result, the position is calculated by the function F () of the propagation loss equation shown in FIG. Fig. 1 up to here
3 is “position detection calculation” in the flowchart shown in FIG. The detection result is processed into a request medium by the external interface 34 and output to an output (OUTPUT). This is the “position detection result” in the flowchart shown in FIG.

FIG. 14 is a conceptual diagram of a state in which the radio base station and the mobile station of the fourth prior art are viewed from above. The conceptual diagram of the fourth prior art wireless base station and the mobile station when viewed from the side is the same as the conceptual diagram of the third prior art shown in FIG. FIG. 15 is a block diagram of a fourth prior art device.

In the fourth prior art, as shown in FIGS. 14 and 15, a plurality of radio base stations 35 and 36 for transmitting a radio signal including an identification code and a plurality of radio base stations 3 and 36 are provided.
The mobile station 38 includes a mobile station 38 including a mobile station 38 that calculates a mobile station position in accordance with the reception level of the radio signal transmitted by each of the mobile stations 5 and 36 and the position information.

Here, in the fourth prior art, the maximum moving speed storage unit 42 that stores the maximum moving speed information of the mobile station 38 in advance, and the position calculated by the position detection result acquisition unit 33 is stored in the maximum moving speed storage unit. Mobile station 38 stored in 42
And an erroneous detection judgment correction unit 43 that judges that the position based on the calculation result is erroneous when the distance is more than the distance that can be moved from the previously observed position estimated from the maximum moving speed information. The erroneous detection determination correction unit 43
The position based on the calculation result is corrected based on the reference position estimated from the maximum movement speed information No. 8 and the maximum movable distance from the reference time. In the figure, 40 is a radio base station 3
A circle centered on the position 5 and having a maximum moving distance as a radius, 37 is a detection device of the mobile station 38, and 39 is an erroneously detected correction distance.

FIG. 16 is a flowchart of the fourth prior art. A wireless signal is input from the input (INPUT) of FIG. The wireless signal reception demodulation unit 32 acquires a reception level of the received wireless signal and position information included in the wireless signal. The position detection result acquisition unit 33 calculates the position using the function F () of the propagation loss equation shown in FIG. This is the “position detection calculation” in the flowchart of FIG.

The reference time / reference position obtaining section 41 obtains a reference time and a reference position based on the characteristics of the reception level of the radio signal and the position detection result. The maximum movement distance at an arbitrary time is calculated from the reference time and reference position and the maximum movement speed stored in the maximum movement speed storage unit 42. This is the “maximum movement distance calculation” in the flowchart of FIG. As described in the conceptual diagram of FIG. 14, the erroneous detection determination correction unit 43 makes the position detection result farther than the maximum movement distance (distance from the reference position to the position detection result> maximum movement distance from the reference position). ) Is corrected to the maximum movement distance (distance from the reference position to the position detection result = maximum movement distance from the reference position). Up to this point, "judgment" in the flowchart of FIG.
And "Modify". The detection result is processed into a request medium by the external interface 34 and output (OUTPU
T). This is the “position detection result” in the flowchart.

FIG. 17 shows the effect of reducing the detection error of the fourth conventional technique as compared with the third conventional technique. The horizontal axis represents the moving distance, and the vertical axis represents the position detection error. As a result, the fourth prior art (the result when applying the prior art 4) is
It can be seen that the position detection error is reduced with respect to the position detection result traveling in the forward direction as compared with the third related art (the result when the related art 3 is applied). In addition, it can be seen that the effect of reducing the position detection error appears in the left half of FIG. 17, that is, in the first half between the wireless base stations in the traveling direction.

[0021]

In the position detecting device shown in the first prior art, the detection accuracy is the size of the wireless zone of the wireless base station, so that the detection accuracy is several hundred meters and high-accuracy position detection is possible. Impossible.

Further, the position detecting device shown in the second prior art, which selects areas in the order of the strongest reception level, cannot achieve high accuracy unless the zones are sufficiently overlapped, and requires a large number of radio base stations. May cause problems such as radio signal interference. On the other hand, when trying to solve those problems, high-precision position detection becomes impossible.

As a position detecting device for realizing highly accurate position detection, a position detecting device using a weighting calculation method for calculating a propagation distance based on reception levels of radio signals from a plurality of radio base stations shown in the third prior art. However, there is a possibility that the detection result may be detected at a position that cannot be realistically due to the fluctuation of the reception level of the radio signal. In particular, when a wireless base station is embedded in the ground and installed, for example, when a person or a vehicle passes over the wireless base station, the reception level of the wireless signal fluctuates, and erroneous position detection occurs. . In order to reduce such erroneous detection, it is necessary to increase the number of wireless base stations, but it is difficult from the viewpoint of securing an installation place and the cost.

In the position detecting device shown in the fourth prior art,
Although it is possible to detect and correct excessive advance in the forward direction, it is impossible to detect and correct excessive return in the reverse direction as a result of the detection. Further, in order to detect excessive advance in the forward direction, the calculation is performed based on the distance from the preceding wireless base station, so that the effect is exhibited only in the first half between the wireless base stations.

The present invention has been made in view of the above circumstances, and detects an abnormal value of a position detection result such as moving at a walking speed higher than that of a general pedestrian or repeating forward and backward movement in a short time. By detecting and correcting, it is possible to reduce the number of forward / backward direction changes based on the position detection result, eliminate abnormal detection results between wireless base stations as a whole, and achieve high-accuracy position detection with a small number of wireless base stations It is an object of the present invention to provide a position detecting system capable of notifying a user of a mobile station or a third party of accurate position information.

[0026]

In order to achieve the above object, the present invention provides a network connecting a plurality of radio base stations and the plurality of radio base stations, a location registration database connected to the network, and a location detecting device. The radio base station comprises means for transmitting a radio signal including its own identification code, and means for connecting the mobile station to the network, wherein the location registration database,
Means for associating the identification code with the position at which the wireless base station is installed; means for registering a position detection result of the mobile station; wherein the position detecting device is connected to the position registration database; and And a position detection system comprising means for calculating the position of the mobile station, and a position detection result obtained by the means for calculating the position of the mobile station, and a plurality of positions obtained before the position detection result. Means for storing a position detection result, means for calculating the moving direction of the mobile station by comparing the position detection result and the plurality of previously obtained position detection results, and a plurality of moving directions for the mobile station. Means for storing the calculation result of the mobile station, means for estimating the traveling direction of the mobile station from the calculation results of the plurality of movement directions of the mobile station, and the progress obtained by the estimation means. Means for performing a comparison of the position detection result and direction, by the comparison, is characterized in that provided in the position detecting device and means for detecting an abnormal position detection result.

According to the present invention, in the position detecting system, the position detecting device is provided with means for correcting the abnormal position detecting result and outputting the corrected position detecting result as the position detecting result. It is assumed that.

According to the present invention, in the position detecting system, the position detecting result other than the abnormal position detecting result is stored as the valid position detecting result, and the valid position detecting result is stored. Means for discarding an abnormal position detection result and outputting the valid position detection result as the position detection result in the position detection device.

Further, in the position detecting system, the position detecting result other than the abnormal position detecting result is regarded as a valid position detecting result, and a difference between the abnormal position detecting result and the valid position detecting result is obtained. The position detecting device is characterized in that the position detecting device is provided with means for taking a product of a coefficient which can be given in advance or sequentially and the difference, and adding a result of addition to the latest valid position detecting result.

The present invention also provides the position detecting system, wherein the position detecting device includes means for setting the number of samples of a plurality of moving direction calculation results based on the moving direction calculation results used in the means for estimating the moving direction. It is characterized by having.

In this way, by discarding or correcting the abnormal detection result, it is possible to reduce the frequent change in the moving direction of the position detection result, and to realize a highly accurate position detection.

The present invention uses a weight calculation method for calculating a propagation distance based on reception levels of radio signals from a plurality of radio base stations described in the third prior art as a system for realizing highly accurate position detection. The present invention is characterized in that erroneous detection of a position in a position detecting device which has been detected is avoided.

Further, as compared with the fourth conventional technique, the number of forward / reverse direction conversions based on the position detection result can be reduced, and an abnormal detection result can be eliminated as a whole between the radio base stations.

For example, since the reception level used for position detection fluctuates irregularly, the movement direction indicated by the detection results of the position detection over a plurality of times may frequently change from forward to backward. It is conceivable that the position detection result at that time or before that is an abnormal detection result. In this case, the direction of travel is estimated from the results of position detections performed a plurality of times in the past, and the estimated direction of travel is compared with the result of position detection. If the result of the detection is abnormal, the position detection result is discarded or corrected. . As a result, it is possible to eliminate an abnormal value of the position detection result, and it is possible to improve the accuracy of the position detection result and reduce a change in the moving direction.

[0035]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings, the same portions are denoted by the same reference numerals and description thereof will be omitted.

FIGS. 1, 11 and 1 show an embodiment of the present invention.
8 will be described. FIG. 1A is a diagram showing the transition of the position detection result of a mobile station when the third conventional technique is used, with the horizontal axis representing distance and the vertical axis representing time, and FIG. FIG. 7 is a diagram illustrating a temporal transition of a mobile station position detection result according to the embodiment of the present invention, with a horizontal axis representing distance and a vertical axis representing time. In the figure, reference numerals 9 and 10 denote actual trajectories (moving at a constant speed), reference numerals 11 and 12 denote displayed position detection results, reference numeral 11 denotes a position detection result after correction, and reference numeral 12 denotes a position detection result before correction. 1A and 1B, the distance (x-axis) and the time (t-axis) are used for explanation, but they are actually three-dimensional, for example, absolute position such as latitude, longitude, altitude, or X , Y, Z
It is represented by the relative position represented by. Note that the conceptual diagram of the wireless base station and the mobile station according to the embodiment of the present invention when viewed from the side is the same as the conceptual diagram of the third related art shown in FIG. FIG. 18 is a configuration diagram showing the entire system of the present invention. According to the present invention, as shown in FIG. 11, a plurality of radio base stations 27 transmitting a radio signal including an identification code,
The mobile station 31 receives a wireless signal containing the identification code transmitted by the wireless base station 27 and the wireless base station 27. Further, as shown in FIG. 18, in order to transfer the reception level and the identification code received by the mobile station 18 from the radio base stations 13 and 14 to the position detecting device 51 via the communication network 19, the communication of the mobile communication system is performed. It can connect to the network 19, and the position detecting device 51
Is a position detection system including means for calculating the position of the mobile station 18 using information registered in the mobile station 18.

The feature of the present invention is shown in FIG.
As shown in FIG. 1, by storing a position detection result obtained by calculating the position of the mobile station 31 and a plurality of position detection results obtained before the position detection result, and comparing the position detection results, The moving direction of the mobile station 31 is calculated, the plurality of calculated results are stored, the traveling direction of the mobile station 31 is estimated from the calculated results of the plurality of moving directions, and the obtained traveling direction is compared with the position detection result. By performing the comparison, an abnormal position detection result is detected. Whether the position detection result is abnormal is determined by comparing the estimated value of the traveling direction with the position detection result and determining whether the position detection result is extremely different from the estimated value of the traveling direction.

An embodiment of the present invention according to claims 1 and 2 will be described with reference to FIGS. For example, FIG.
Is a position detecting device 51 shown in FIG.
Has been implemented as That is, as shown in FIGS. 2 and 3, the position detection result (acquisition of the position detection result) obtained from the position detection result obtaining unit 33 is stored in the position detection result storage unit 45. The difference between the stored position detection result and the past position detection result for one detection is calculated by the movement direction calculation unit 44 to obtain the moving direction of the mobile station (by comparing the position detection results, Direction) and stored in the moving direction storage unit 46. Obtain the position detection results so far,
A series of flows for acquiring the moving direction from the past position detection results for one detection is repeated for several past detections, and the results are also stored in the moving direction storage unit 46 in the same manner. The traveling direction is estimated by performing a majority decision on the stored plural moving directions by the traveling direction calculation unit and the traveling direction estimation unit 47 (estimation of the traveling direction).
The traveling direction estimation result acquired here and the position detection result acquired first are compared by the position detection result comparison unit 48 to determine whether the position detection result is normal (comparison: is the position detection result normal? ). When the position detection result obtained first is a normal value, the position detection result obtained first is output (output of the position detection result). When the position detection result is an abnormal value, the position detection result acquired first by the position detection result correction unit 43 is corrected (correction of the position detection result), and the corrected position detection result is output (the position detection result is corrected). output). As a result, the number of forward / reverse direction conversions based on the position detection results can be reduced, and at the same time, abnormal detection results can be eliminated in the entire radio base stations.

Next, a third embodiment of the present invention will be described with reference to FIGS. For example, the position detecting device shown in FIG. 5 is mounted on the mobile station 31 shown in FIG. That is, as shown in FIGS. 4 and 5, the position detection result (acquisition of the position detection result) obtained by the position detection result obtaining unit 33 is stored in the position detection result storage unit 45. The difference between the stored position detection result and the latest valid result described later (the latest valid position detection result among the valid position detection results) is calculated by the moving direction calculation unit 44, and the moving direction of the mobile station 31 is calculated. It is acquired and stored in the movement direction storage unit 46. The latest valid result is stored in the latest valid result storage unit of the reference numeral 49. A plurality of moving directions are stored in the moving direction storage unit 46 by repeating the above-described series of flows. As in the first and second embodiments, the traveling direction is estimated by performing a majority decision by the traveling direction calculating unit and the traveling direction estimating unit 47 from a plurality of moving directions. The traveling direction estimation result acquired here and the position detection result acquired first are compared with the position detection result comparing unit 48.
Then, it is determined whether or not the position detection result is normal (comparison: is the position detection result normal?). When the position detection result obtained first is a normal value, the position detection result obtained first (the obtained position detection result is the latest valid position detection result) is output from the external interface 34 (the latest valid position detection). Result output),
At the same time, the position detection result acquired first is stored in the latest valid result storage unit 49 as the latest valid position detection result. That is, the latest valid position detection result is reused in the above-described process of acquiring the moving direction. When the position detection result is an abnormal value, the position detection result acquired first by the position detection result correction unit 43 is discarded (position detection result is discarded), and the latest valid result stored in the latest valid result storage unit 49 is discarded. The position detection result is output from the external interface 34 (output of the latest valid position detection result). As a result, the number of forward / reverse direction conversions based on the position detection results can be further reduced, and abnormal detection results can be eliminated as a whole between the wireless base stations.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. For example, the position detecting device shown in FIG. 7 is mounted as the position detecting device 51 shown in FIG. 18 as in the first and second embodiments. The present embodiment differs from the embodiment of the third aspect in that the internal processing of the position detection result correction unit 43 and the addition of a coefficient storage unit 50 as a device block. IN in the position detection result correction unit 43 in FIG.
The PUT is an input from the comparison unit of the position detection result indicated by reference numeral 48 shown in FIG. 7, and is input only when the position detection result is considered to be normal. The input of the coefficient shown in FIG. 6 is an input from the coefficient storage unit denoted by reference numeral 50 shown in FIG. The OUTPUT shown in FIG. 6 is connected to the external interface 34 shown in FIG. The calculation unit 51 acquires a difference between the position detection result regarded as normal input from the INPUT and the latest valid position detection result stored in the latest valid result storage unit 49. The operation unit 52 acquires the product of the difference of the operation unit 51 and the coefficient stored in the coefficient storage unit 50. The arithmetic unit 53 adds the integration result obtained by the arithmetic unit 52 to the latest effective position detection result, and outputs the result of the arithmetic unit 53 as the latest effective position detection result thereafter via the OUTPUT shown in FIG. Output from the interface 34. Note that the latest valid position detection result is stored in the latest valid result storage unit 49. Further, the coefficient storage unit 50
Is not constant and can be changed and set successively. As a result, it is determined that the traveling direction is valid in the estimation of the traveling direction, but it is possible to limit the result of the abnormally large movement from the previous position detection result toward the traveling direction considered to be correct. As a result, it is possible to further reduce the number of forward / reverse direction change based on the position detection result.

Finally, an embodiment according to claim 5 of the present invention will be described with reference to FIG. For example, in the first and second embodiments, it is possible to set the number of samples (the number of samples) of the results of the past movement directions stored used for estimating the traveling direction. That is, a plurality of position detection results from the present to the past are acquired, and the moving direction is acquired by comparing the plurality of position detection results. The number of samples in the moving direction used for estimating the traveling direction is set, and the traveling direction is estimated. Similarly, the present invention can be realized in the embodiment according to the third aspect. This makes it possible to control the influence from the past position detection results.

[0042]

As described above, according to the present invention, by detecting and correcting an abnormal value of a position detection result, it is possible to reduce the number of forward / backward direction changes based on the position detection result.
At the same time, it is possible to provide a position detection system capable of eliminating abnormal detection results in the entire radio base stations and realizing high-accuracy position detection with a small number of radio base stations. The present invention can provide an excellent effect of providing a position detection system capable of notifying a user of a mobile station or a third party of accurate position information.

[Brief description of the drawings]

FIG. 1A is a conceptual diagram showing a temporal transition of a conventional position detection result, and FIG. 1B is a conceptual diagram showing a temporal transition of a position detection result according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the position detecting device according to the first and second embodiments of the present invention.

FIG. 3 is a main block configuration diagram of a position detecting device according to an embodiment of claims 1 and 2 of the present invention.

FIG. 4 is a flowchart showing an operation of the position detecting device according to the embodiment of the third aspect of the present invention.

FIG. 5 is a main block configuration diagram of a position detection device according to an embodiment of the present invention;

FIG. 6 is a block diagram showing the operation of a position detecting device according to an embodiment of the present invention.

FIG. 7 is a main block diagram showing a position detecting device according to an embodiment of the present invention.

FIG. 8 is a conceptual diagram showing an operation according to an embodiment of claim 5 of the present invention.

FIG. 9 is a conceptual diagram showing a first conventional technique.

FIG. 10 is a conceptual diagram showing a second conventional technique.

FIG. 11 is a conceptual configuration diagram viewed from an aspect of a third conventional technique.

FIG. 12 is a block diagram of a main part showing a position detecting device according to a third conventional technique.

FIG. 13 is a flowchart showing the operation of the position detecting device according to the third conventional technique.

FIG. 14 is a conceptual diagram of a fourth conventional technique viewed from above.

FIG. 15 is a block diagram of a main part showing a position detecting device according to a fourth conventional technique.

FIG. 16 is a flowchart showing the operation of the position detecting device according to the fourth conventional technique.

FIG. 17 is a characteristic diagram showing the effect of the fourth conventional technique in comparison with the third conventional technique.

FIG. 18 is a conceptual configuration diagram showing a position detection system according to an embodiment of the present invention.

[Explanation of symbols]

1,2,3,4,13,14,21,22,23,2
7, 28, 35, 36 wireless base station 5, 6, 7, 8, 29, 30 wireless signal reception level 9, 10 actual movement locus (constant speed movement) 11, 12 displayed position detection result 15, 16, 24 wireless zone 17 user 18, 31, 38 mobile station 19 communication network 20 location registration database 25, 26 area 32 wireless signal reception / demodulation unit 33 position detection result acquisition unit 34 external interface 37 detection position 39 erroneous detection correction distance 40 wireless base A circle centered on the position of the station 35 and having a radius equal to the maximum movement distance 41 Reference time / reference position acquisition unit 42 Maximum movement speed storage unit 43 Erroneous detection judgment correction unit 44 Moving direction calculation unit 45 Position detection result storage unit 46 Moving direction storage Unit 47 heading direction calculation unit and heading direction estimation unit 48 position detection result comparison unit 49 storage of the latest valid result 50 coefficient storage unit 51 the position detecting device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shuji Kubota 2-3-1 Otemachi, Chiyoda-ku, Tokyo F-term within Nippon Telegraph and Telephone Corporation (reference) 5J062 AA08 AA09 AA11 BB05 EE00 FF01 5K067 AA21 BB04 EE02 EE10 EE16 FF03 JJ53 JJ63

Claims (5)

[Claims] 1. A wireless communication system comprising: a plurality of wireless base stations; a network connecting the plurality of wireless base stations; a position registration database connected to the network; and a position detecting device, wherein the wireless base station identifies its own identification code. Means for transmitting a radio signal including, comprising means for connecting the mobile station to the network, wherein the location registration database,
Means for associating the identification code with the position at which the wireless base station is installed; means for registering a position detection result of the mobile station; wherein the position detecting device is connected to the position registration database; and And a position detection system comprising means for calculating the position of the mobile station, a position detection result obtained by the means for calculating the position of the mobile station, and a plurality of positions obtained before the position detection result Means for storing a position detection result; means for calculating the moving direction of the mobile station by comparing the position detection result with the plurality of previously obtained position detection results; and a plurality of moving directions for the mobile station. Means for storing the calculation result of the above, means for estimating the traveling direction of the mobile station from the calculation results of the plurality of movement directions of the mobile station, and Position detection system for a means for performing a comparison between the row direction the position detection result by said comparison, characterized in that it comprises a position detecting device and means for detecting an abnormal position detection result. 2. The position detection device according to claim 1, wherein the position detection device includes means for correcting the abnormal position detection result and outputting the corrected position detection result as the position detection result. system. 3. A means for storing the valid position detection result as a valid position detection result other than the abnormal position detection result as a valid position detection result; and discarding the abnormal position detection result as a position detection result;
The position detection system according to claim 1, further comprising means for outputting the valid position detection result as the position detection result. 4. A coefficient capable of determining a difference between the abnormal position detection result and the valid position detection result by using a position detection result other than the abnormal position detection result as a valid position detection result and providing the difference in advance or sequentially. 2. The position detecting system according to claim 1, further comprising means for obtaining a product of the difference and the difference and adding a result of addition to the latest valid position detecting result in the position detecting device. 5. The position detecting device according to claim 1, further comprising means for setting the number of samples of a plurality of moving direction calculation results based on the moving direction calculation result used for the means for estimating the moving direction. The position detection system as described.