子孔径NCS算法中虚假目标产生的机理与消除方法研究

李建阳; 常文革; 李悦丽

doi:10.3724/SP.J.1146.2009.00565

子孔径NCS算法中虚假目标产生的机理与消除方法研究

doi: 10.3724/SP.J.1146.2009.00565

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出版历程
- 收稿日期: 2009-04-19
- 修回日期: 2009-12-22
- 刊出日期: 2010-05-19

The Theory Analysis of False Target in Sub-aperture Algorithm

摘要

摘要: 子孔径结构的引入是实现Ultra Wide Band SAR(UWB SAR)实时信号处理的关键。将子孔径结构与Nonlinear Chirp Scaling(NCS)算法相结合的子孔径NCS算法可以较好的实现UWB SAR实时信号处理，但子孔径结构的引入使得成像结果中存在虚假目标的影响。针对子孔径NCS算法中存在虚假目标的现象，该文从理论上分析了虚假目标产生的机理，并提出了对距离弯曲校正前的子孔径回波两端补零的改进子孔径NCS算法消除虚假目标，最后通过仿真和实测的UWB SAR回波数据验证了该文理论分析以及所提方法的正确性。
- 实时信号处理; UWB SAR; 子孔径NCS算法; 虚假目标
Abstract: The sub-aperture algorithm has great important role in SAR real-time processing. The algorithm combined the sub-aperture and Nonlinear Chirp Scaling (NCS) algorithm has good performance in real-time processing of UWB SAR. However the ghost or false targets exist in the algorithm based on sub-aperture. In this paper, the reason for ghost or false target existing is theoretically analyzed, furthermore, the method of eliminating the ghost is proposed using zero-padding with sub-aperture data. Finally, the validity is verified with simulation and real UWB SAR data.

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