CAJ | 학술논문

结合数字波束形成技术,多通道SAR可以有效克服天线最小面积的限制,从而实现高分辨率宽测绘带的合成孔径成像.然而通道之间的幅相误差以及基线误差等因素严重影响数字波束形成解模糊操作.该文提出了一种针对高分辨宽测绘带(HRWS)的多通道SAR通道间误差校正方法.该方法考虑了通道误差的多普勒空变性,利用信号子空间和噪声空间的正交性实现对包括基线误差,阵元误差等综合通道间幅相误差的快速优化估计.实测数据验证了方法的有效性.
결합수자파속형성기술,다통도SAR가이유효극복천선최소면적적한제,종이실현고분변솔관측회대적합성공경성상.연이통도지간적폭상오차이급기선오차등인소엄중영향수자파속형성해모호조작.해문제출료일충침대고분변관측회대(HRWS)적다통도SAR통도간오차교정방법.해방법고필료통도오차적다보륵공변성,이용신호자공간화조성공간적정교성실현대포괄기선오차,진원오차등종합통도간폭상오차적쾌속우화고계.실측수거험증료방법적유효성.
This paper focuses on the channel calibration for multi-channel Synthetic Aperture Radar (SAR) imagery. Incorporated with DBF processing, multi-channel SAR is promising in High-Resolution and Wide-Swath (HRWS) imaging. It coherently combines recorded multi-channel signals to overcome the spectrum ambiguity. However, the mismatch between channels and baseline errors should be compensated before the processing. In this paper, a novel calibration is proposed for multi-channel SAR HRWS imagery by making use of the orthogonality between signal subspace and noise subspace. The calibration is incorporated with the post-Doppler beam forming processing, which estimates the synthetic element error caused by nonideal factors. The real data experiment demonstrates the good performance of Doppler ambiguity suppression after our calibration. The results confirm the validity of the approach.