论文部分内容阅读
大斜视SAR成像时,距离向和方位向严重耦合,距离走动现象明显,传统的SAR成像算法面临严重挑战。论文针对大斜视SAR的成像特点,提出了一种分段处理的大斜视SAR成像算法。该算法根据等效聚束条件进行方位分块,在每个子块内通过距离压缩、相位补偿、距离校正和方位傅里叶变换等步骤实现子图聚焦,最后通过几何校正和子图拼接得到条带SAR图像。仿真结果表明,该算法能适应大斜视SAR成像条件,获得较好的聚焦效果。
In strabismus SAR imaging, the distance and azimuth are seriously coupled and the distance is very obvious. The traditional SAR imaging algorithms are facing serious challenges. Aiming at the imaging features of large strabismus SAR, this paper proposes a staged SAR imaging algorithm. The algorithm divides azimuths according to the equivalent beamforming conditions, and achieves the sub-image focusing in each sub-block through the steps of distance compression, phase compensation, distance correction and azimuth Fourier transform. Finally, the strip is obtained by geometric correction and subgraph splicing SAR image. The simulation results show that the algorithm can adapt to SAR imaging conditions and obtain better focusing effect.