一种基于变换域的滑动聚束SAR 调频率估计方法

基金项目:

国家自然科学基金(61101200, 61331017)资助课题

An Improved Doppler Rate Estimation Approach for Sliding Spotlight SAR Data Based on the Transposition Domain

1.
(Key Laboratory of Technology in Geo-spatial Information Processing and Application System, Institute of Electronics, Chinese Academy of Science, Beijing 100190, China)
2.
(Insititute of Electronics, Chinese Academy of Science, Beijing 100190, China)
3.
(University of Chinese Academy of Science, Beijing 100190, China)

摘要: 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。
- 合成孔径雷达(SAR) /
- 滑动聚束 /
- 两步处理 /
- 多普勒调频率估计
Abstract: 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.
- Synthetic Aperture Radar (SAR) /
- Sliding spotlight /
- Two step focusing technique /
- Doppler rate estimation