Geometry and System Aspects of Spaceborne/Airborne Hybrid Bistatic SAR

Spaceborne/airborne hybrid bi-static SAR is a new kind of remote sensor raised in recent years, whose development is still at an early stage for its great difficulty. Due to the high differences between satellites´ and aircrafts´ velocities and altitudes, there are remarkable differences between the hybrid system and systems which have the symmetrical structure, such as spaceborne bi-static SAR and airborne bi-static SAR. Three basic and critical issues in the hybrid system are discussed, including geometry, Doppler properties and signal model. On the basis of the research work done in this paper, imaging algorithm of the hybrid system can be further designed in the next step.