Abstract
A concept of space-surface bistatic synthetic aperture radar (SS-BSAR) passive imaging system is proposed, which is parasitic on the signal of COMPASS Navigation Satellite System (CNSS). The feasibility is demonstrated by analyzing the signal ambiguity function and the range resolution as well as the system topology. Due to the multiple peaks of signal in the auto-correlation function, a new correlation is used to remove the side-peaks. A double-channel receiver is employed to receive the direct satellite signal and the ground reflected signal. The direct signal is a reference signal in range compression, and may also be used for transmitter-receiver signal synchronization. The reflected signal is raw data collected for imaging. Then, a modified range-Doppler imaging algorithm is derived based on the system geometric models and BSAR imaging principle. The proposed algorithm is verified via signal simulation. The work in this paper is of great value to the further use of COMPASS signal, as well as other global navigation satellite signals in passive imaging.
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