VALIDITY CHECK OF VEHICLE POSITION INFORMATION
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Accused Products
Abstract
A method for validating received positional data in vehicle surveillance applications wherein vehicles transmit positional data indicating their own position to surrounding vehicles. A a radio direction finding antenna arrangement of a receiving unit receives a signal carrying positional data indicating an alleged position of a vehicle, transmitted from a radio source. The bearing from the receiving unit to the radio source is estimated utilizing the radio direction finding antenna arrangement and the received signal. The distance between the receiving unit and the radio source is estimated based on the time of flight for a signal travelling there between at known speed. An estimated position of the radio source is calculated based on the estimated bearing and the estimated distance. A deviation value indicating the deviation/coincidence between the alleged position of a vehicle is determined according to the received positional data and the estimated position of the radio source.
58 Citations
27 Claims
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1-15. -15. (canceled)
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16. A method for validating received positional data in vehicle surveillance applications, wherein vehicles transmit positional data indicating their own position to surrounding vehicles, the method comprising:
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receiving, with a radio direction finding antenna arrangement of a receiving unit, a signal carrying positional data indicating an alleged position of a vehicle, transmitted from a radio source; estimating a bearing from the receiving unit to said radio source utilizing said radio direction finding antenna arrangement and a received signal; estimating a distance between the receiving unit and the radio source based on a time of flight for a signal travelling between the radio source and the receiving unit at a known speed; calculating an estimated position of the radio source based on the estimated bearing and the estimated distance, and determining a deviation value indicating the deviation/coincidence between the alleged position of the vehicle according to the received positional data and the estimated position of the radio source, wherein the signal carrying the positional data further comprises transmission time information indicating a point in time at which the signal was transmitted, and wherein estimating the time of flight comprises establishing the point in time at which the signal was transmitted based on the transmission time information, and determining a time elapsed between transmission and reception of the signal. - View Dependent Claims (17, 18, 19, 20)
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21. A vehicle surveillance system for vehicle surveillance applications, wherein vehicles transmit positional data indicating their own position to surrounding vehicles, the vehicle surveillance system comprising:
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a bearing-estimator adapted to receive a signal carrying positional data indicating an alleged position of a vehicle, transmitted from a radio source, said bearing-estimator further being adapted to estimate a bearing to said radio source using said received signal; a distance-estimator adapted to estimate a distance to the radio source based on a time of flight for a signal received therefrom, which signal travels at known speed; a calculating unit adapted to calculate an estimated position of the radio source based on the estimated bearing and the estimated distance; and a comparing unit adapted to determine a deviation value indicating the deviation/coincidence between the alleged position of a vehicle according to the received positional data and the estimated position of the radio source, wherein the signal carrying the positional data further comprises transmission time information indicating a point in time at which the signal was transmitted, and wherein the distance-estimator is adapted to estimate the time of flight by establishing the point in time at which the signal was transmitted based on the transmission time information, and determining an time elapsed between transmission and reception of the signal. - View Dependent Claims (22, 23, 24, 25)
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26. A vehicle, comprising:
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a vehicle surveillance system for vehicle surveillance applications, wherein vehicles transmit positional data indicating their own position to surrounding vehicles, the vehicle surveillance system comprising; a bearing-estimator adapted to receive a signal carrying positional data indicating an alleged position of a vehicle, transmitted from a radio source, said bearing-estimator further being adapted to estimate a bearing to said radio source using said received signal; a distance-estimator adapted to estimate a distance to the radio source based on a time of flight for a signal received therefrom, which signal travels at known speed; a calculating unit adapted to calculate an estimated position of the radio source based on the estimated bearing and the estimated distance; and a comparing unit adapted to determine a deviation value indicating the deviation/coincidence between the alleged position of a vehicle according to the received positional data and the estimated position of the radio source, wherein the signal carrying the positional data further comprises transmission time information indicating a point in time at which the signal was transmitted, and wherein the distance-estimator is adapted to estimate the time of flight by establishing the point in time at which the signal was transmitted based on the transmission time information, and determining an time elapsed between transmission and reception of the signal.
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27. A ground-based air traffic control station for air traffic surveillance, the air traffic control station comprising:
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a vehicle surveillance system for vehicle surveillance applications, wherein vehicles transmit positional data indicating their own position to surrounding vehicles, the vehicle surveillance system comprising; a bearing-estimator adapted to receive a signal carrying positional data indicating an alleged position of a vehicle, transmitted from a radio source, said bearing-estimator further being adapted to estimate a bearing to said radio source using said received signal; a distance-estimator adapted to estimate a distance to the radio source based on a time of flight for a signal received therefrom, which signal travels at known speed; a calculating unit adapted to calculate an estimated position of the radio source based on the estimated bearing and the estimated distance; and a comparing unit adapted to determine a deviation value indicating the deviation/coincidence between the alleged position of a vehicle according to the received positional data and the estimated position of the radio source, wherein the signal carrying the positional data further comprises transmission time information indicating a point in time at which the signal was transmitted, and wherein the distance-estimator is adapted to estimate the time of flight by establishing the point in time at which the signal was transmitted based on the transmission time information, and determining an time elapsed between transmission and reception of the signal.
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Specification