单站直达波欺骗干扰检测与抑制的DPCA方法

针对合成孔径雷达(synthetic aperture radar, SAR)单干扰机直达波欺骗干扰的检测和抑制问题, 提出一种基于双通道分置相位中心天线(displace phase-center antenna, DPCA)方法的欺骗干扰检测方法。在DPCA条件下建立了图像域干扰信号模型，分析表明干扰信号在主辅图像中近似仅存在空变的相位偏置和位置偏移。基于该特征引入图像退化模型, 在DPCA检测基础上完成主图像内欺骗干扰的估计与抑制。点阵和面目标仿真结果验证了本文信号模型的正确性和欺骗干扰抑制算法的有效性。所提算法几乎不损失被欺骗干扰遮盖区域的场景信息, 能够有效抑制经由天线主瓣或副瓣进入的单站理想直达波欺骗干扰。

DPCA method for detection and suppression of monostatic direct-wave deceptive jamming

Aiming at the issue of detection and suppression of monostatic direct-wave deceptive jamming for synthetic aperture radar (SAR), a detection and suppression approach based on displace phase center antenna (DPCA) is proposed. A model of jamming signal in image domain is established under DPCA condition. The analysis shows that there is only space-variant phase offset and position offset in the master and slave images. Furthermore, image degradation model is also introduced to estimate and suppress deceptive jamming in master image based on DPCA detection. Simulations on point array and extended target verify both the model derived and the proposed deceptive jamming estimation and suppression algorithm. The proposed algorithm causes little information loss of scene covered by decoy target. It works for both main-lobe and side-lobe monostatic ideal direct-wave deceptive jamming.