Collision warning system
First Claim
1. A method of providing a collision warning signal for at least one vehicle, comprising the steps of:
- (a) transmitting from the surface of the earth a radio signal;
(b) receiving at the surface of the earth, a radio signal returned by a vehicle in response to the radio signal transmitted in step (a);
(c) determining an elapsed time between the transmitting of the radio signal and the receiving of the corresponding returned radio signal;
(d) determining the position of the vehicle at least in part in dependence upon the elapsed time determined in step (c);
(e) comparing the position of the vehicle determined in step (d) with terrain data stored in a data base; and
(f) generating a warning signal based on the comparing in step (e) if predetermined parameters are satisfied.
1 Assignment
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Accused Products
Abstract
A collision warning signal for at least one vehicle is provided by transmitting from the surface of the earth a radio signal, receiving at the surface of the earth, a radio signal returned by a vehicle in response to the transmitted radio signal, determining an elapsed time between the transmitting of the radio signal and the receiving of the corresponding returned radio signal, determining the position of the vehicle at least in part in dependence upon the determined elapsed time, comparing the determined position of the vehicle with terrain data stored in a data base, and generating a warning signal based on the comparison if predetermined parameters are satisfied.
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Citations
14 Claims
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1. A method of providing a collision warning signal for at least one vehicle, comprising the steps of:
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(a) transmitting from the surface of the earth a radio signal; (b) receiving at the surface of the earth, a radio signal returned by a vehicle in response to the radio signal transmitted in step (a); (c) determining an elapsed time between the transmitting of the radio signal and the receiving of the corresponding returned radio signal; (d) determining the position of the vehicle at least in part in dependence upon the elapsed time determined in step (c); (e) comparing the position of the vehicle determined in step (d) with terrain data stored in a data base; and (f) generating a warning signal based on the comparing in step (e) if predetermined parameters are satisfied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A collision warning system based on the surface of the earth comprising:
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a terrain data base containing terrain data; a radio signal transmitter for transmitting radio signals; a receiver for receiving radio signals returned by a vehicle in response to the radio signals transmitted by said transmitter; means for determining an elapsed time between transmission of a radio signal by said transmitter and receipt of a corresponding radio signal returned by a vehicle; position determining means for identifying the position of a vehicle at least in part in dependence on said elapsed time; and a comparator for comparing the determined position of the vehicle with the terrain data in the terrain data base and generating a warning signal if predetermined parameters are satisfied. - View Dependent Claims (12, 13, 14)
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Specification