Parameter Estimation Method for LFM Direct Wave Signals Under Multi-Domain Aliasing Condition with Passive Radar

Accurate parameter estimation of direct wave signal is the premise for passive radar detection. However, due to the increasingly complex electromagnetic environment, the multi-domain aliasing situation may appear for the received LFM direct wave signals, making the parameter estimation performance degradation. This paper proposes an aliasing removal algorithm based on analytic signal construction-blind source separation (ASC-BSS). Firstly, the two-channel signal is constructed analytically, and then the aliasing removal is realized by blind source separation. Finally, the parameters of the de-aliasing signal are estimated. Simulation experiments show that the validity of the proposed method.