JP2006284338A - Vehicle travelling verification system, vehicle travelling verification technique, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle travelling verification system, a vehicle travelling verification technique, and a program capable of detecting the fake itself of GPS satellite observation data. <P>SOLUTION: A GPS satellite retrieving section 12 retrieves the GPS satellite number used to compute a travelling trajectory based on the GPS satellite observations acquired by an inputting section 10 from the vehicle. Next, a GPS satellite arithmetic section 14 determines the GPS satellite number, the direct wave of which is usable to acquire the travelling trajectory of the objective vehicle based on the data of travelling trajectory of vehicle acquired by the input section 10. A comparing section 16 compares the GPS satellite number retrieved by the GPS satellite retrieving section 12 with the GPS satellite number acquired by the GPS satellite arithmetic section 14 and, if the both numbers are completely in agreement, discriminates that the GPS satellite observations to track the travelling trajectory of the objective vehicle are faked, and finally outputs the forgery data alarm signal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle travel verification system, a vehicle travel verification method, and a program for verifying vehicle travel data that can determine a travel locus using a GPS signal.

  Conventionally, a system for monitoring a travel route of a waste transport vehicle and detecting or preventing illegal dumping has been proposed.

For example, in Patent Document 1 and Patent Document 2 below, observation data transmitted from a GPS (Global Positioning System) satellite (GPS satellite number, elevation angle, azimuth angle, etc .; hereinafter referred to as GPS satellite observation data) A system for monitoring a travel route of a waste transport vehicle using coordinate information calculated based on the above is disclosed.
JP 11-334806 A JP 2003-44576 A

  However, in the above prior art, if GPS satellite observation data from a GPS satellite used for monitoring the travel route of a waste transport vehicle is forged, the correctness of the travel route of the vehicle cannot be correctly determined. was there.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a vehicle travel verification system, a vehicle travel verification method, and a program capable of detecting the forgery of GPS satellite observation data itself.

  In order to achieve the above object, the present invention is a vehicle travel verification system that verifies travel data of a vehicle including a GPS receiver, and obtains a travel locus of the vehicle and data used to obtain it. A GPS satellite extracting means for extracting a GPS satellite used by the GPS receiver to calculate a travel locus from data used to obtain a travel locus of the vehicle, and based on the travel locus data of the vehicle, In order to obtain the travel locus of the vehicle, a GPS satellite calculation means for reversely calculating which GPS satellite could be used, a GPS satellite number extracted by the GPS satellite extraction means, Comparing means for comparing with a GPS satellite number calculated backward by the GPS satellite computing means.

  Here, the comparison means outputs a data fraud warning signal when the GPS satellite number extracted by the GPS satellite extraction means and the GPS satellite number calculated backward by the GPS satellite calculation means all match. It is characterized by.

  Further, the present invention is a vehicle travel verification system for verifying travel data of a vehicle including a GPS receiver, the data acquisition means for acquiring data for determining the travel locus of the vehicle from the vehicle, and the data received from the vehicle Elevation angle data extraction means for extracting the elevation angle data of GPS satellites from data, and elevation angle data determination means for determining whether or not the elevation angle data includes an elevation angle smaller than a predetermined threshold value. To do.

  Here, the elevation angle data determination means outputs a data fraud warning signal when the elevation angle data does not include an elevation angle smaller than a predetermined threshold value.

  The present invention also relates to a vehicle travel verification method for verifying travel data of a vehicle including a GPS receiver, the step of acquiring a travel locus of the vehicle and data used for obtaining the travel locus, and the travel locus of the vehicle. In order to obtain the travel locus of the vehicle based on the step of extracting the GPS satellite used by the GPS receiver to calculate the travel locus from the data used for obtaining the travel locus and the data of the travel locus of the vehicle, A step of reversely calculating whether it is necessary to use a direct wave from the GPS satellite, and a step of comparing the extracted GPS satellite number with the reversely calculated GPS satellite number. .

  The present invention is also a vehicle travel verification method for verifying travel data of a vehicle including a GPS receiver, the step of acquiring data for determining a travel locus of the vehicle from the vehicle, and the data received from the vehicle Extracting the elevation angle data of the GPS satellite, and determining whether or not the elevation angle data includes an elevation angle smaller than a predetermined threshold value.

  Further, the present invention is a vehicle travel verification program for verifying travel data of a vehicle including a GPS receiver, and obtains a travel locus of the vehicle and data used for obtaining the travel locus to obtain the travel locus of the vehicle. In order to extract the GPS satellite used by the GPS receiver to calculate the travel locus from the data used for the purpose, and to obtain the travel locus of the vehicle based on the travel locus data of the vehicle, from any GPS satellite It is characterized in that a computer is executed to perform a reverse operation of whether or not it is necessary to use the direct wave and compare the extracted GPS satellite number with the reversely calculated GPS satellite number.

  The present invention is also a vehicle travel verification program for verifying travel data of a vehicle including a GPS receiver, wherein data for obtaining a travel locus of the vehicle is acquired from the vehicle, and GPS data is obtained from the data received from the vehicle. The satellite elevation angle data is extracted, and the computer is caused to execute a process of determining whether or not the elevation angle data includes an elevation angle smaller than a predetermined threshold value.

  Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described with reference to the drawings.

  FIG. 1 shows a block diagram of a configuration example of a vehicle travel verification system according to the present invention. 1, the vehicle travel verification system includes an input unit 10, a GPS satellite extraction unit 12, a GPS satellite calculation unit 14, a comparison unit 16, an elevation angle data extraction unit 18, an elevation angle data determination unit 20, an output control unit 22, a display 24, The printer 26 and the storage unit 28 are included.

  The input unit 10 has a function of acquiring GPS satellite observation data for obtaining travel locus data and / or travel locus from a vehicle on which a GPS receiver is mounted and whose travel data is to be verified. The input unit 10 includes an appropriate disk drive, a communication connector, a keyboard, and the like, and is configured to acquire travel locus or GPS satellite observation data via a data storage disk or other storage medium or a keyboard. Moreover, it is good also as a structure which acquires driving | running | working locus | trajectory or GPS satellite observation data with networks, such as the internet and LAN (private communication network), via a communication connector. This input unit 10 functions as data acquisition means of the present invention.

  The GPS satellite extraction unit 12 extracts the number of the GPS satellite used by the GPS receiver to calculate the travel locus of the target vehicle from the GPS satellite observation data for obtaining the travel locus acquired from the target vehicle by the input unit 10. To do. In other words, the GPS receiver receives GPS satellite observation data from GPS satellites capable of receiving radio waves at each point as data for obtaining the traveling locus of the target vehicle. The GPS satellite observation data also includes GPS satellite numbers. include. Therefore, by configuring the GPS satellite extraction unit 12 so as to extract the GPS satellite number included in the GPS satellite observation data, it is possible to extract the GPS satellite number from the GPS satellite observation data used for obtaining the travel locus. it can.

  The GPS satellite calculation unit 14 determines which GPS satellite could be used to obtain the travel locus of the target vehicle based on the travel locus data acquired from the target vehicle by the input unit 10. The number of GPS satellites that could be used is calculated by performing reverse calculation. The travel locus data includes the latitude, longitude, altitude, positioning time, and the like of the route traveled by the target vehicle. Therefore, as the inverse calculation, for example, a high-accuracy three-dimensional digital map and GIS (Geographic Information System) software are used, and the sky view field at the positioning time at each point on the travel locus from the travel locus data of the target vehicle There is a method of acquiring (obstruction information on the sky) and obtaining a GPS satellite located in the sky-visible region at the positioning time from the operation data. The GPS satellites obtained by such inverse calculation are satellites that can be directly received by the GPS receiver, and do not include GPS satellites received by multipath.

  The comparison unit 16 compares the number of the GPS satellite extracted by the GPS satellite extraction unit 12 with the number of the GPS satellite obtained by the GPS satellite calculation unit 14 by the reverse calculation, and when all these GPS satellite numbers match. In addition, a data fraud warning signal indicating that the traveling data of the vehicle may be forged is output. Details of this determination method will be described later.

  The elevation angle data extraction unit 18 extracts the elevation angle data of the GPS satellites that transmitted the GPS satellite observation data from the GPS satellite observation data received from the vehicle that is the target of the travel data verification.

  The elevation angle data determination unit 20 determines whether or not the elevation angle data extracted by the elevation angle data extraction unit 18 includes an elevation angle smaller than a predetermined threshold. If the elevation angle data does not include an elevation angle smaller than the predetermined threshold, A data fraud warning signal indicating that the vehicle travel data may be forged is output. Details of this determination method will be described later.

  The output control unit 22 controls the process of displaying the travel locus data acquired from the target vehicle, GPS satellite observation data, fraud warning, etc. on the display 24 and printing out from the printer 26.

  The storage unit 28 is composed of, for example, a CPU working RAM, a flash memory as a non-volatile memory, a magnetic storage medium, and the like, and data on the trajectory of the target vehicle, GPS satellite observation data, an elevation angle threshold value, fraud warning, etc. Etc. and data and programs are stored.

  Note that the vehicle travel verification system described above may be a computer configured with a CPU at the center. In this case, each function of the vehicle travel verification system is performed by the CPU executing a program stored in a hard disk or other medium. Realized.

  FIG. 2 shows an example of a time schedule table of times at which GPS satellites orbiting around the earth are located in the sky view range at a certain point on the earth. In FIG. 2, the horizontal axis indicates the time, and the vertical axis indicates the GPS satellite number assigned to each GPS satellite. Further, in FIG. 2, the GPS satellite is located in a clear viewable area in the sky means that the elevation angle of the GPS satellite viewed from the point is a predetermined angle, for example, 3 degrees or more. The presence of objects that limit visibility is not considered. However, the value of the elevation angle is not particularly limited. In FIG. 2, it means that the GPS satellite is located in the above-described visible range in the time range indicated by the thick solid line.

  FIG. 3 is an explanatory diagram showing how the GPS receiver mounted on the target vehicle receives GPS satellite observation data from a GPS satellite. As described above, at a certain point on the earth and at a certain time, a part of the GPS satellites 30 orbiting the earth is located in the viewable area in the sky. However, on the ground surface, there are buildings, trees and other objects that obstruct the sky view. For this reason, the number of GPS satellites 30 that can be directly received by the GPS receiver of the target vehicle 32 is smaller than the number of GPS satellites 30 that are located in the sky-visible region.

  That is, in the example shown in FIG. 3, the GPS receiver can directly receive a wave (solid line) from the GPS satellites 30-a, c, e, and f among the GPS satellites 30 located in the sky viewing range. GPS satellites 30-b, d, and g are behind the building and cannot directly receive waves. In addition, the broken line of FIG. 3 has shown the direct wave which the GPS receiver was able to receive if there were no obstructions, such as a building. However, with respect to the GPS satellite 30-d, the radio wave is reflected by the wall of the building and becomes a multipath 34, and can be received as an indirect wave. The multipath 34 is a disturbance factor for the position measurement of the target vehicle 32 by the GPS receiver, but in the position measurement by the GPS system, it is inevitable depending on the existence of the building and other ground surface conditions. This is a disturbance factor (noise) mixed in.

  As described above, in the actual position measurement by the GPS system, it is inevitable that a disturbance factor such as the multipath 34 is mixed. Therefore, the travel locus of the target vehicle extracted by the GPS satellite extraction unit 12 is calculated. When the GPS satellites used in the above include only those that can receive direct waves, there is a high possibility that GPS satellite observation data for determining the traveling locus of the target vehicle has been fabricated. Therefore, in this case, the output control unit 22 outputs a data fraud warning from the display 24 or the printer 26.

  FIG. 4 shows a flowchart of an operation example of the vehicle travel verification system according to the present embodiment. In FIG. 4, when the input unit 10 acquires the vehicle travel locus data and the GPS satellite observation data for obtaining the travel locus from the vehicle to be verified for travel data by a network or other appropriate method (S 1). The GPS satellite extraction unit 12 extracts the number of the GPS satellite used by the GPS receiver to calculate the travel locus of the target vehicle from the GPS satellite observation data (S2).

  Next, the GPS satellite calculation unit 14 reversely calculates which GPS satellites need to use the direct wave in order to obtain the travel trajectory of the target vehicle based on the travel trajectory data of the vehicle, The number of the GPS satellite that had to be used is obtained (S3).

  Next, the comparison unit 16 compares the number of the GPS satellite extracted by the GPS satellite extraction unit 12 with the number of the GPS satellite obtained by the GPS satellite calculation unit 14 by the reverse calculation (S4). As a result, if both the GPS satellite numbers match (S5), it is determined that the GPS satellite observation data for obtaining the travel locus of the target vehicle has been produced, and a data fraud warning signal is output ( S6). This is because the GPS satellites calculated by the GPS satellite calculation unit 14 include only satellites that can receive direct waves and do not include disturbance factors that are inevitably mixed in position measurement by the GPS system.

  The output control unit 22 receives the data fraud warning signal and outputs a data fraud warning from the display 24 or the printer 26 (S7).

  In S5, if all the GPS satellite numbers do not match, the GPS satellite number extracted by the GPS satellite extraction unit 12 includes a satellite number that cannot receive a direct wave, that is, a disturbance factor. Since the determination can be made, the comparison unit 16 does not output a data fraud warning signal (S8).

  With the above operation, it is possible to accurately detect the forgery of GPS satellite observation data. Further, after this, a traveling locus may be obtained again using GPS satellite observation data by removing disturbance factors such as multipath.

  FIG. 5 shows a flowchart of another operation example of the vehicle travel verification system according to the present embodiment. In this operation example, GPS satellite observation data for obtaining a travel locus of a vehicle to be verified is GPS satellite observation data and / or pseudo GPS satellite observation data acquired from an electronic reference point and / or virtual reference station network system. It is an example of the operation | movement which detects this when produced based on this. Here, the electronic reference point is installed at a predetermined point, and is configured to receive radio waves from GPS satellites and transmit GPS satellite observation data. In addition, the virtual reference station network system is configured to receive GPS satellite observation data transmitted from surrounding electronic reference points, create pseudo GPS satellite observation data at a specific point at a specific time, and transmit this. ing.

  When the electronic reference point receives GPS satellite observation data from a GPS satellite, the influence of the surrounding environment of the electronic reference point installation location, such as the presence of buildings and trees, and the increase in the distance passing through the earth's atmosphere Due to the influence, GPS satellite observation data from a GPS satellite with a small elevation angle contains a lot of noise. For this reason, each electronic reference point is configured to transmit only GPS satellite observation data from a GPS satellite having an elevation angle greater than a predetermined elevation angle. For this reason, the GPS satellite observation data fabricated using the electronic reference point and / or the virtual reference station network system includes only GPS satellites whose elevation angle is larger than a predetermined value. Therefore, the elevation angle threshold for determining the elevation angle of the GPS satellite received by the GPS receiver mounted on the vehicle to be verified is transmitted by the electronic reference point and / or the virtual reference station network system based on the elevation angle of the received GPS satellite. If it is set to be smaller than the elevation angle of the GPS satellite observation data, the forgery of the GPS satellite observation data can be detected by examining the elevation angle included in the GPS satellite observation data.

  In FIG. 5, when the input unit 10 acquires data on a vehicle's traveling locus and GPS satellite observation data for determining the traveling locus from a vehicle whose traveling data is to be verified by a network or other appropriate method (S11). The elevation angle data extraction unit 18 extracts elevation angle data from the GPS satellite observation data (S12).

  Next, the elevation angle data determination unit 20 reads the threshold value of the elevation angle from the storage unit 28, and compares the elevation angle data with the elevation angle represented by the elevation angle data extracted by the elevation angle data extraction unit 18 to determine the size (S13). When the elevation angle includes a value smaller than the predetermined threshold (S14), as described above, the GPS receiver mounted on the vehicle is the GPS satellite observation data received from the GPS satellite, so the possibility of forgery is low. The elevation angle data determination unit 20 does not output a data fraud warning signal (S15).

  On the other hand, if the elevation angle does not include a value smaller than the predetermined threshold value in S14, the GPS satellite observation data may be created using the electronic reference point and / or virtual reference station network system as described above. The elevation angle data determination unit 20 outputs a data fraud warning signal (S16).

  The output control unit 22 receives the data fraud warning signal and outputs a data fraud warning from the display 24 or the printer 26 (S17).

  With the above operation, it is possible to accurately detect the forgery of GPS satellite observation data.

It is a block diagram of the structural example of the vehicle travel verification system concerning this invention. It is a figure which shows the example of the time schedule table | surface of the time when the GPS satellite orbiting the circumference | surroundings of the earth is located in an overlookable area | region in the sky in a certain point on the earth. It is explanatory drawing of a mode that the GPS receiver mounted in the target vehicle receives a GPS signal from a GPS satellite. It is a flowchart of the operation example of the vehicle travel verification system concerning this embodiment. It is a flowchart of the other operation example of the vehicle travel verification system concerning this embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Input part, 12 GPS satellite extraction part, 14 GPS satellite calculating part, 16 Comparison part, 18 Elevation angle data extraction part, 20 Elevation angle data determination part, 22 Output control part, 24 Display, 26 Printer, 28 Storage part, 30 GPS satellite , 32 Target vehicle, 34 Multipass.

Claims (8)

A vehicle travel verification device for verifying travel data of a vehicle including a GPS receiver,
A data acquisition means for acquiring a travel locus of the vehicle and data used for obtaining the trajectory;
GPS satellite extraction means for extracting GPS satellites used by the GPS receiver to calculate the travel locus from the data used to determine the travel locus of the vehicle;
GPS satellite calculation means for reversely calculating which GPS satellite could be used to obtain the vehicle travel locus based on the vehicle travel locus data;
Comparing means for comparing the number of GPS satellites extracted by the GPS satellite extracting means with the number of GPS satellites calculated backward by the GPS satellite calculating means;
A vehicle travel verification system comprising:   2. The vehicle travel verification system according to claim 1, wherein the comparison unit is configured such that the GPS satellite number extracted by the GPS satellite extraction unit and the GPS satellite number calculated backward by the GPS satellite calculation unit all match. A vehicle running verification system that outputs a data fraud warning signal. A vehicle travel verification system for verifying travel data of a vehicle including a GPS receiver,
Data acquisition means for acquiring data for obtaining a travel locus of the vehicle from the vehicle;
Elevation angle data extraction means for extracting elevation angle data of GPS satellites from data received from the vehicle;
Elevation angle data determination means for determining whether or not the elevation angle data includes an elevation angle smaller than a predetermined threshold;
A vehicle travel verification system comprising:   4. The vehicle travel verification system according to claim 3, wherein the elevation angle data determination means outputs a data fraud warning signal when the elevation angle data does not include an elevation angle smaller than a predetermined threshold. Driving verification system. A vehicle travel verification method for verifying travel data of a vehicle including a GPS receiver,
Obtaining a vehicle trajectory and the data used to determine it;
Extracting the GPS satellite used by the GPS receiver to calculate the travel locus from the data used to determine the travel locus of the vehicle;
Based on the data of the travel locus of the vehicle, in order to obtain the travel locus of the vehicle, a reverse calculation of which GPS satellite had to use a direct wave;
Comparing the extracted GPS satellite number with the back-calculated GPS satellite number;
A vehicle travel verification method comprising: A vehicle travel verification method for verifying travel data of a vehicle including a GPS receiver,
Obtaining data from the vehicle for determining the vehicle's travel locus;
Extracting elevation data of GPS satellites from data received from the vehicle;
Determining whether the elevation angle data includes an elevation angle smaller than a predetermined threshold;
A vehicle travel verification method comprising: A vehicle travel verification program for verifying travel data of a vehicle including a GPS receiver,
Obtain the vehicle's travel trajectory and the data used to determine it,
From the data used to determine the travel locus of the vehicle, the GPS satellite used by the GPS receiver to calculate the travel locus is extracted,
Based on the data of the vehicle trajectory, in order to determine the vehicle trajectory, the GPS satellite from which the direct wave from which it was necessary to use the reverse operation,
A vehicle travel verification program that causes a computer to execute a process of comparing the extracted GPS satellite number and the reversely calculated GPS satellite number. A vehicle travel verification program for verifying travel data of a vehicle including a GPS receiver,
Obtain data from the vehicle to determine the vehicle's travel trajectory,
From the data received from the vehicle, the GPS satellite elevation angle data is extracted,
A vehicle travel verification program for causing a computer to execute a process of determining whether or not an elevation angle smaller than a predetermined threshold is included in the elevation angle data.

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