Target detection method in passive bistatic radar

Owing to the advantages in detecting the low altitude and stealth target, passive bistatic radar (PBR) has received much attention in surveillance purposes. Due to the uncontrollable characteristic of the transmitted signal, a high level range or Doppler sidelobes may exist in the ambiguity function which will degrade the target detection performance. Mismatched filtering is a common method to deal with the ambiguity sidelobe problem. However, when mismatched filtering is applied, sidelobes cannot be eliminated completely. The residual sidelobes will cause false-alarm when the constant false alarm ratio (CFAR) is applied. To deal with this problem, a new target detection method based on preprocessing is proposed. In this new method, the ambiguity range and Doppler sidelobes are recognized and eliminated by the preprocessing method according to the prior information. CFAR is also employed to obtain the information of the target echo. Simulation results and results on real data illustrate the effectiveness of the proposed method.