An IAA-based DOA Estimation Method for PBR in Coherent Environment

We propose a new method to estimate the directions-of-arrival (DOA) of target for passive bistatic radar (PBR) system in coherent environment. Since the illuminators of PBR is non-cooperative, the performance of the DOA estimation suffers from limited snapshots and low signal-to-noise ratio (SNR) In addition, the interferences of strong direct wave and multipath signals are also intractable to deal with. In this method a sparse representation of the signals is firstly established, and the iterative adaptive approach (IAA) is applied to spatial spectrum estimation. Then we can eliminate the direct wave in the airspace and obtain the DOA estimation of the scattered signal of target by searching for peaks. Compared with the previous works, the proposed method achieves improved DOA estimation accuracy. Simulation results validate the better performance of the proposed method.