星载SAR在轨成像实时处理算法研究

星载合成孔径雷达(SAR)分辨率和幅宽的不断提高,其产生的原始数据率越来越大,采用在轨实时成像处理形成图像,在图像域再进行传统的图像数据处理和传输,有助于降低星-地数据传输速率,为了提高星载SAR在轨成像处理的实时性,文章分析了星上特殊条件对星载SAR处理算法实时性所提出的约束,对RD、波束域、CS等经典的星载SAR成像处理算法的运算量进行了比较,以CS算法为例,研究了相位补偿因子对CS成像处理算法的实时性影响,提出了一种补偿因子区域不变的CS成像算法,它极大地减少了成像处理算法的运算量,并通过仿真实验结果验证了该算法的有效性。

Research of On-board Real-time Imaging Processing Algorithm of Space-borne Synthetic Aperture Radar

With the in creasing of Space-borne SAR resolution and swath, On-board real-time ima- ging processing is adopted to decrease the data-rate of transmission between satellite and earth station. In order to improve the real-time signal processing capability of on-board Space-borne SAR imaging, in this paper, the signal processing constraints proposed by the special conditions of satellite are analyzed, and the comparison of three classic space-borne SAR imaging processing algorithms namely RD.WK.CS is briefly presented. A demonstration of CS algorithm , the im- pact on CS imaging processing produced by the phase compensation factor （PCF） is studied, and a novel CS imaging algorithm named constant-in-region of PCF is put forward, which greatly im- proves the calculation efficiency of imaging processing algorithm. The experimental result of sim- ulation validate the up-dated algorithm.