摘要
合成孔径(SAR)技术能有效提高雷达的方位分辨率,但当雷达航迹与波束重合时方位分辨率会迅速下降,形成盲区。为解决前视成像问题,本文引入了多通道解卷积技术,以单脉冲雷达为背景,研究了解卷积后的成像信噪比和方位分辨率,认为对天线方向图截断后的形状也是影响信噪比的主要原因之一。在此基础上进行的前视成像仿真结果表明:这种方法相对实孔径成像可有效改善方位分辨率一个数量级以上,同时信噪比损失相对不考虑天线方向图截断形状明显减小。
Synthetic aperture technique can improve the cross range resolution of image greatly. But it has a ＂blind region＂ near the direction of platform motion. Multi-channel deconvolution are proposed to compensate this limitation. In this paper we examine a for- word-looking imaging method by employing multi channel deconvolution in monopulse radar. The performance including SNR and angle resolution of optimal deconvovlers are discussed. It is concluded that the form of the truncated antenna pattern is also one of the main factors which influence SNR. Simulation results are presented showing that an order of improvement in angle resolution over real aperture imaging can be achieved with less SNR loss compare to without consideration of the truncation effect.
出处
《信号处理》
CSCD
北大核心
2007年第5期699-703,共5页
Journal of Signal Processing
基金
2005航天支撑技术基金资助
关键词
前视成像
多通道解卷积
解卷积算子
单脉冲雷达
forword-looking imaging
multi-channel deconvolution
deconvolver
monopulse radar
