Signal Analysis of Forward Looking SAR System

摘要

Based on the difference between the forward-looking mode and the side-looking mode of spaceborne SAR system, this paper carefully analysis the Doppler properties of the forward-looking SAR (FSAR) mode: Doppler frequency and Doppler bandwidth etc; And point out the relation of the azimuth resolution of FSAR with carrier frequency , platform altitude and azimuth range in the surface of the Earth etc. and the azimuth resolution of FSAR isn't relate with antenna aperture length; And carefully discuss that these factors affect the azimuth resolution and that FSAR constrain to pulse repetition frequency (PRF) and elevation angle; And explain the area of high resolution imaging and the request of the FSAR for the radar platform altitude.