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 multidomain 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.