聚束式合成孔径雷达的条带式处理方法  

Spotlight Mode SAR Signal Process Using Stripmap Technology

作　　者：孔德亮[1] 宋红军[1] 

机构地区：[1]中国科学院电子学研究所,北京100080

出　　处：《测试技术学报》2004年第3期223-227,共5页Journal of Test and Measurement Technology

摘　　要：　聚束式合成孔径雷达是一种高性能遥感工具,它可以获得一块区域内高分辨率的微波遥感图像.但是如何处理它的数据却是一大难题,原因在于它总的方位向带宽通常远远大于方位向采样率(PRF),这样会产生严重的方位向频谱混叠效应.所以我们无法直接应用传统的条带式处理技术来对聚束式数据进行处理.本文讨论了一种将条带式数据处理的聚焦成像技术应用到处理聚束式数据中的算法.它的核心步骤是预滤波,可以实现方位向数据和一个参数可调的线性调频信号的卷积.经过这个滤波器后,方位向数据的频谱混叠得到了补偿,再应用稍加修改的传统条带式处理算法就可以获得良好的聚焦图像.The spotlight mode SAR is a very useful remote sensing equipment. It can acquire an image of small area with high resolution, but how to process its data is a difficult problem. Because usually its azimuth's bandwidth is much larger than the pulse repetition frequency (PRF), these will cause serious azimuth spectral aliasing phenomenon. So we can't use the conventional processing method. What discussed in this article is a kind of method that can use the stripmap technology in spotlight signal processing. The key of this method is the pre-filter, which convolutes the raw data with a selected azimuth LFM. After this filter, the azimuth spectral aliasing phenomenon is overcomed, so that we can use the conventional technology to gain a full focused image.

关 键 词：方位向 合成孔径雷达 频谱混叠 线性调频信号 聚焦 PRF 预滤波 数据 算法 图像 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TN958[自动化与计算机技术—计算机科学与技术]