AN ACCURATE RANGE MODEL FOR GEO SPACEBORNE-AIRBORNE BISTATIC SAR

GEO spaceborne-airborne bistatic SAR (GEO SA-BiSAR) has flexible configuration and the ability of multi-looking imaging, so it has a good application prospect. The transmitting propagation delay is about 0.1s due to the 36500Km high altitude transmitter, so the motion of ground target and receiver in the propagation delay can't be ignored. This paper presents a range model under the 'non-stop-and-go' assumption, which analyzes the transmitting and receiving process respectively, and we consider the movement of the target and receiving platform under long transmitting delay, and obtains a succinct and accurate range model. For the delay of each process, we establish the accurate numerical solution, the approximate solution and expanded of the time delay under the 'non-stop-and-go' assumption separately. Simulation results show that our method can estimate the real propagation delay accurately for both stationary and moving targets.