Patent ID: 7518543
Filing Date: 2009-04-14
Classification: G01S

Abstract:
1. A method for determining positions of targets in a position space using signals scattered by the targets, comprising: using a plurality of transmitters and a plurality of receivers of electromagnetic or acoustic signals, spread as a plurality of bistatic pairs in known points in the position space, each bistatic pair of a transmitter and a receiver being referred to as a measuring facility, the transmitter and the receiver of each bistatic pair being respectively placed at two different ones of said known points, the positions of the transmitters and receivers and the range of the transmitters being selected so that a target at an arbitrary point within the position space is measured by scattering in the target by at least four cooperating measuring facilities; analyzing received signals, which includes determining moments of transmission and reception and parameterization of received signals as a function of the path of propagation between transmission point and reception point; selecting an even number of at least four cooperating measuring facilities for the target position determination; associating targets by calculating, in two independent ways, two sets of sums of distances between transmission points and targets and, respectively, targets and reception points, based on bistatic distances, measured via the targets, for selected measuring facilities; sorting said two sums with respect to the distance; and comparing and establishing that the sums, calculated in the two different ways, which correspond with each other within a predetermined margin of error, are stated to correspond to conceivable targets; completing and improving said target association by performing calculations for bistatically measured Doppler velocities, corresponding to calculations for distances, and establishing that the sums, calculated in the two different ways, which correspond with each other within a predetermined margin of error, are stated to correspond to targets; and calculating the positions of the targets from a system of equations for the bistatically measured distances.