Modeling and Analysis of RFI Impacts on Imaging between Geosynchronous SAR and Low Earth Orbit SAR

Due to the short revisit time and large coverage of Geosynchronous synthetic aperture radars (GEO SARs) increasing number low earth orbit radar (LEO SAR) constellations, radio frequency interference (RFI) between GEO SARs LEO may occur, deteriorating quality SAR images. Traditional methods only simplify RFI noise-like without considering signal characteristics. In this paper, accurately evaluate impacts GEO-to-LEO LEO-to-GEO on imaging quantitatively, an RFI-impact quantitative analysis model is established. Taking account chirp form systems, power image Signal-to-Interference-plus-Noise Ratio (SINR) are theoretically deduced validated by numerical experiments. Based proposed method, under different system parameters bistatic configurations estimated, probability also given. The results show that specular scattering has serious effects imaging, can approach 2% for certain orbital will become higher as constellations increase in future, implying necessity suppress system.