A Barrage Jamming Suppression Scheme for DBF-SAR System Based on Elevation Multichannel Cancellation
Shuohan Cheng, Huifang Zheng, Weidong Yu, Zongsen Lv, Zhen Chen, Tianyu Qiu
Abstract
Elevation multichannel synthetic aperture radar (SAR) utilizes digital beamforming (DBF) technology to achieve high-resolution and wide-swath (HRWS) imaging. However, electromagnetic jamming sometimes occurs in SAR images, resulting in the loss of scene information. A DBF-SAR system is weak in resisting jamming signals, and the barrage jamming signals within an imaging swath are not easy to remove using traditional suppression methods for DBF-SAR. Thus, an advanced barrage jamming suppression scheme based on elevation multichannel cancellation is proposed. First, the jamming signals in the echoes are removed using a well-designed channel cancellation filter to obtain the jamming-free signals. In accordance with the characteristics of jamming-free signals, the weighting coefficients are rededuced, and a modified DBF method is presented to achieve HRWS imaging and improve the DBF-SAR signal-to-noise ratio (SNR). In this way, the proposed scheme can effectively eliminate barrage jamming signals. In addition, some simulations and a 16-channel airborne DBF-SAR experiment were executed to demonstrate the proposed scheme.