调频连续波SAR方位多波束成像

Imaging of FMCW SAR using multiple azimuth beams

调频连续波合成孔径雷达(FMCW SAR)结合了调频连续波和合成孔径雷达的双重优点,不但体积小、造价低廉,而且还可以高分辨率成像。在无人机和临近空间飞行器的应用方面前景广阔。对于常规SAR,方位分辨率和宽测绘带的矛盾限制了其更广泛的应用,且FMCW载波泄露问题影响其探测距离从而影响测绘带。为此,以距离多普勒成像算法为基础,探索使用多相位中心方位多波束技术实现FMCW SAR的高分辨率宽测绘带成像,最后通过仿真验证了方位多波束成像方法的有效性。

Frequency-modulated continuous-wave synthetic aperture radar （FMCW SAR） combining FMCW technology and SAR techniques together, is a small size, low cost and high resolution imaging system. It can be extensively applied in both unmanned aerial vehicles and near space vehicles. For the conventional FMCW SAR, the contradiction between azimuth resolution and wide swath imposes restrictions on its application. FMCW carrier leakage has an impact on the detection range and swath. In order to overcome these limitations, the paper combines multiple azimuth beams （MAB） with FMCW SAR, and presents a high- resolution wide-swath imaging method using displaced phase centers （DPC） based on range Doppler algorithm. Finally, the simulation test verifies the effectiveness of the high-resolution wide-swath imaging method.