Wavefront Curvature Compensation In Bistatic Polar Format Algorithm Under Arbitrary Flight Path And Its Realization On GPU

Synthetic aperture radar (SAR) is a high resolution microwave imaging system with all weather,day and night capability. The polar format algorithm (PFA) is a spotlight SAR imaging algorithmwhich is suitable for high-resolution and small scene. With the development of SAR, theconfiguration of SAR becomes diversified and the bistatic SAR occurs. In bistatic SAR, thetransmitter and receiver of radar are separate. Its mode of operation is more flexible, and the operatingdistance is farther. At the same time the returned signal is more abundant. The separation oftransmitter and receiver results in a complicate form of the doppler phase term of the received signaland the derivation of bistatic algorithm with high precision is complex. In order to cope with thesituation under arbitrary flight path and expand the scope of bistatic SAR scene, the bistatic polarformat algorithm and its wavefront curvature error compensation under arbitrary flight path areproposed.With the application fields of SAR broadened, the requirement of SAR imaging for human isincreasing. Faced with these challenges, it’s necessary to increase the accuracy of imaging algorithmand reduce the running time of imaging algorithm. The high-speed developing Graphics ProcessingUnit (GPU) offers a new promising type platform for efficient SAR imaging algorithm.Comparedwith CPU, GPU is lowcost and high-performance. The algorithm efficiency realized on ComputeUnified Device Architecture (CUDA) can be enhanced greatly. This offers a promising researchdirection for new challenges in SAR imaging fields.