VALIDITY CHECK OF VEHICLE POSITION INFORMATION TRANSMITTED OVER A TIME-SYNCHRONIZED DATA LINK
First Claim
1. A method for validating positional data in vehicle surveillance applications wherein vehicles transmit positional data indicating their own position to surrounding vehicles, said method comprising:
- receiving, at a receiving unit, a first signal carrying positional data indicating an alleged position (PADS-B(5);
PADS-B(5′
), PADS-B(15″
)) of a vehicle, transmitted from a radio source over a data link;
estimating the distance (dEST(5), dEST(5′
), dEST(15″
)) between the receiving unit and the radio source based on the time of flight and the propagation velocity of the received signal; and
determining a deviation value indicating the difference between a distance to the position (PADS-B(5);
PADS-B(5′
), PADS-B(15″
)), of a vehicle according to the received positional data and the estimated distance (dEST(5), dEST(5′
), dEST(15″
)) to the radio source,wherein said data link is a data link over which transmissions of signals carrying positional data indicating alleged positions of vehicles are initiated at given transmission points in time that are known by all users of said data link, and wherein said time of flight being determined based on the time elapsed from the transmission point in time of said first signal to the time of reception of at least a first part of said first signal.
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Accused Products
Abstract
A method for validating positional data in vehicle surveillance applications wherein vehicles transmit positional data indicating their own position to surrounding vehicles using a data link over which a transmission is initiated at a given transmission point in time that is known by all users of the data link. A signal transmitted from a radio source over the data link is received at a receiving unit. The signal carries positional data indicating an alleged position of a vehicle. The distance between the receiving unit and the radio source is estimated based on the time of flight and the propagation velocity of the received signal. The time of flight is determined based on the time elapsed from the transmission point in time of the signal to the time of reception of at least a first part of the signal. A deviation value is determined. The deviation value indicates the difference between the distance to the position of a vehicle according to the received positional data and the estimated distance to the radio source.
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Citations
17 Claims
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1. A method for validating positional data in vehicle surveillance applications wherein vehicles transmit positional data indicating their own position to surrounding vehicles, said method comprising:
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receiving, at a receiving unit, a first signal carrying positional data indicating an alleged position (PADS-B(5);
PADS-B(5′
), PADS-B(15″
)) of a vehicle, transmitted from a radio source over a data link;estimating the distance (dEST(5), dEST(5′
), dEST(15″
)) between the receiving unit and the radio source based on the time of flight and the propagation velocity of the received signal; anddetermining a deviation value indicating the difference between a distance to the position (PADS-B(5);
PADS-B(5′
), PADS-B(15″
)), of a vehicle according to the received positional data and the estimated distance (dEST(5), dEST(5′
), dEST(15″
)) to the radio source,wherein said data link is a data link over which transmissions of signals carrying positional data indicating alleged positions of vehicles are initiated at given transmission points in time that are known by all users of said data link, and wherein said time of flight being determined based on the time elapsed from the transmission point in time of said first signal to the time of reception of at least a first part of said first signal. - View Dependent Claims (2, 3, 4, 5, 17)
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6. 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 receiver adapted to receive a first signal carrying positional data indicating an alleged position of a vehicle, transmitted from a radio source over a data link; a distance estimator adapted to estimate the distance to the radio source based on the time of flight and the propagation velocity of the received signal; and a comparison unit adapted to determine a deviation value indicating the difference between a distance to the position of a vehicle according to the received positional data and the estimated distance to the radio source, wherein said data link is a data link over which transmissions of signals carrying positional data indicating alleged positions of vehicles are initiated at given transmission points in time that are known by all users of said data link, and wherein said distance estimator is adapted to determine said time of flight based on the time elapsed from the transmission point in time of said first signal to the time of reception of at least a first part of said first signal. - View Dependent Claims (7, 8, 9, 16)
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10. 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 receiver adapted to receive a first signal carrying positional data indicating an alleged position of a vehicle, transmitted from a radio source over a data link; a distance estimator adapted to estimate the distance to the radio source based on the time of flight and the propagation velocity of the received signal; and a comparison unit adapted to determine a deviation value indicating the difference between a distance to the position of a vehicle according to the received positional data and the estimated distance to the radio source, wherein said data link is a data link over which transmissions of signals carrying positional data indicating alleged positions of vehicles are initiated at given transmission points in time that are known by all users of said data link, and wherein said distance estimator is adapted to determine said time of flight based on the time elapsed from the transmission point in time of said first signal to the time of reception of at least a first part of said first signal. - View Dependent Claims (11, 12, 13)
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14. A ground-based air traffic control station for air traffic surveillance, 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 receiver adapted to receive a first signal carrying positional data indicating an alleged position of a vehicle, transmitted from a radio source over a data link; a distance estimator adapted to estimate the distance to the radio source based on the time of flight and the propagation velocity of the received signal; and a comparison unit adapted to determine a deviation value indicating the difference between a distance to the position of a vehicle according to the received positional data and the estimated distance to the radio source, wherein said data link is a data link over which transmissions of signals carrying positional data indicating alleged positions of vehicles are initiated at given transmission points in time that are known by all users of said data link, and wherein said distance estimator is adapted to determine said time of flight based on the time elapsed from the transmission point in time of said first signal to the time of reception of at least a first part of said first signal.
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15. A land-based Vessel Traffic Service station for maritime traffic surveillance, 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 receiver adapted to receive a first signal carrying positional data indicating an alleged position of a vehicle, transmitted from a radio source over a data link; a distance estimator adapted to estimate the distance to the radio source based on the time of flight and the propagation velocity of the received signal; and a comparison unit adapted to determine a deviation value indicating the difference between a distance to the position of a vehicle according to the received positional data and the estimated distance to the radio source, wherein said data link is a data link over which transmissions of signals carrying positional data indicating alleged positions of vehicles are initiated at given transmission points in time that are known by all users of said data link, and wherein said distance estimator is adapted to determine said time of flight based on the time elapsed from the transmission point in time of said first signal to the time of reception of at least a first part of said first signal.
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Specification