Off-Grid Endoclutter Target Removal for Passive Radar

Direct path interference and clutter suppression removal algorithms are a necessity in the processing chain of a passive radar. Most echoes originating from targets of interests are many orders of magnitude weaker than the clutter. However, targets with a high radar cross-section, or close to a transmitter, or to a receiver, may contribute significant power to the recorded signal. If such a target approaches the zero-Doppler line on a range-Doppler plot, it could affect a clutter cancellation algorithm and produce significant, non-removable sidelobes. In this paper, the effects of such processing are presented for an Extensive Cancellation Algorithm. An off-grid method of estimation and removal of an endoclutter target is presented. The effectiveness of the algorithm is presented on both simulated and measured data sets.