CAJ | 학술논문

高分辨率滑动聚束 SAR 成像处理对多普勒调频率精度具有非常高的要求，而由于滑动聚束 SAR 回波信号往往存在多普勒频谱混叠的问题，传统的调频率估计方法通常无法直接应用。该文针对这一问题提出基于方位频谱去混叠的变换域调频率估计方法，并嵌入两步算法实现了滑动聚束模式的聚焦成像。仿真结果验证了该方法的有效性。
고분변솔활동취속 SAR 성상처리대다보륵조빈솔정도구유비상고적요구，이유우활동취속 SAR 회파신호왕왕존재다보륵빈보혼첩적문제，전통적조빈솔고계방법통상무법직접응용。해문침대저일문제제출기우방위빈보거혼첩적변환역조빈솔고계방법，병감입량보산법실현료활동취속모식적취초성상。방진결과험증료해방법적유효성。
In image processing of high-resolution sliding spotlight SAR, it is important to know the Doppler rate with accuracy;however, traditional Doppler rate estimation algorithms are not very helpful because of the azimuth spectrum folding phenomenon. In this study, an algorithm that works on the transposition domain is proposed to solve this problem. Furthermore, the algorithm is also helpful in obtaining excellent focused images by embedding it in the two-step technique. Finally, the proposed algorithm is verified using computer simulations.