Navigation Satellite Passive Radar Moving Target Detection and SAR Imaging Based on FRFT

Conventional radars have less invisibility, but the passive radars based on TV, FM signals also have some restrictions in SAR imaging by a range of issues such as ground electromagnetic environment and signal silence. This paper presents a new method of passive SAR imaging based on navigation satellite signal with single/multiple receive-only mode in FRFT domain. The received reflection of single multiple GPS signals from target is approximately linear FM signals which can be transformed by FRFT for signal frequency and Doppler frequency detection and estimation, especially for the target SAR imaging. Simulation results shown the effectiveness of the algorithm, and help to avoid the multi-target SAR imaging interference.