Research on Bistatic SAR Motion Compensation

Bistatic SAR imaging of stationary scenes is well studied theoretically, and SAR images show the success of the bistatic flight campaign. Besides of technical problems-like the synchronization of the oscillators and the processing of bistatic raw data imaging-motion compensation including autofocus is not well studied theoretically all the same, which is a major area in bistatic SAR. Motion errors of the platform result in image distortion and the azimuth displacement, then motion compensation must be done. This paper proposes a method of SBMC for the special case of equal velocity vectors and parallel flight paths of transmitter and receiver, which is based on the bistatic-to-monostatic movement errors conversion (BMMEC). In the end, the phase gradient auto-focus (PGA) for bistatic SAR motion compensation is also studied, which is a validity SBMC approach