Patent ID: 7277052
Filing Date: 2007-10-02
Classification: G01S

Abstract:
1. A method of detecting a mobile craft in a reception system making use of transmitters of opportunity whose signal comprises elements enabling the synchronization of the receiver, wherein the method comprises the following steps: a) detecting certain discriminating sequences of a signal, b) separating each transmission present on the carrier frequencies examined by the receiver by the space/time filtering of the signals in each carrier frequency, c) identifying the transmitters Ei corresponding to the signals received, d) determining the pulse response of the propagation channel for each transmitter Ei and for each detection made on the transmitter Ei, g) measuring the instant of arrival of the signal reflected on the path by the mobile craft and then its delay relative to the instant of transmission from the transmitter, h) deducing the position of the mobile craft at the intersection of the ellipsoids defined by the foci constituted by the transmitters Ei from which signals are received and the receiver or receivers Rj.