Moving Target Parameter Estimation and SFN Ghost Rejection in Multistatic Passive Radar

In this paper, we consider the motion parameter estimation of ground moving targets in a multistatic passive airborne radar that utilizes broadcast signals as a source of opportunity. It is shown, by focusing on the target position or within its close vicinity, that the narrow signal bandwidth permits the use of a moderate coherent integration time without range migration compensation. The multistatic nature, achieved through the use of multiple illumination sources, enables velocity and acceleration estimation in two-dimensional horizontal directions on the ground. A cost function is developed based on the estimated motion parameters which, when three or more illuminators are available, allows rejection of ghost targets in a single-frequency network (SFN) and proper parameter association in the presence of multiple closely spaced moving targets.