TOPSAR beam position design method based on linear flow

Tackling the complexity and inefficiency in the system design of spaceborne terrain observation by progressive scans (TOPSAR) mode, this paper analyses some beam position design problems unattended before, including the variation of azimuth resolution with slant-range, the effects on azimuth ambiguity to the signal ratio (AASR) of antenna pattern grating lobes introduced by beam steering, and the relationship between timeline and observation efficiency. Then a novel system beamposition design method is presented based on the linear flow, in which the selection of pulse repetition frequency is optimized according to the required AASR. The proposed method adds freedom and avoids iteration, thus improving the efficiency of system design. Finally, the validity of the method is justified by simulation results.