一种基于APES的回波域强杂波旁瓣抑制方法

An Approach for Suppressing Sidelobes of Strong Clutters in Echo Domain Based on APES

针对合成孔径雷达(SAR)观测区外的强目标将其旁瓣混叠至观测区内影响微弱目标的检测,基于正弦信号幅度相位估计(APES)提出一种新的旁瓣抑制方法。该方法将抑制对象确定为观测区外的强杂波,则混叠至观测区内微弱目标处的旁瓣为强杂波旁瓣。首先根据回波域双曲线形状确定强杂波所在位置,其次利用APES对其散射系数在回波域进行估计并抑制,抑制后的SAR图像中强杂波旁瓣对微弱目标的不利影响得到了有效消除,且对微弱目标几乎不造成任何影响。实测数据处理证明了此方法的有效性。

This paper proposes a new approach of suppressing sidelobes based on APES in the case that sidelobes of strong targets alias into outside SAR viewing area and adverse impact on weak targets detection can be made. Strong clutters outside viewing area need to be suppressed. The locations of strong clutters are determined based on the shape of their hyperbolic curves in echo domain. The scattering coefficients of strong clutters are estimated by APES and then suppressed in echo domain. SAR images generated from suppressed echoes can avoid the adverse impact of strong clutters on weak targets detection effectively. Experimental re suits show the effectiveness of the approach.