去斜率线性调频合成孔径雷达成像研究  

SAR Imaging Based on Dechirp Processing

作　　者：李海英[1] 杨汝良[1] 

机构地区：[1]中国科学院电子学研究所,北京100080

出　　处：《现代雷达》2003年第3期8-10,39,共4页Modern Radar

摘　　要：为获得高距离分辨率 ,雷达一般发射宽带或超宽带信号 ,这给数据采集带来了很大的困难。A/ D采样是数据采集的瓶颈 ,所以必须降低大时间带宽积信号的采样频率。当雷达发射线性调频信号时 ,去斜率方法能有效降低接收机中频带宽 ,从而减小数据采集难度和数据量。本文将去斜率原理用于高分辨率合成孔径雷达 ,通过原理分析和仿真实验证明了该方法的正确性和有效性 。In order to obtain high range resolution, wideband or ultra wideband waveform are used to radar system, which makes great trouble for data collection. Since the limitation of A/D technology is a bottleneck in the implementation, A/D sampling rate must be lowered. For Chirp waveform, dechirp provides the ability to alleviate the A/D problem by easing the requirement on the sampling rate and reduce the quantity of data. In this paper, dechirp is applied to Synthetic Aperture Radar, and furthermore, both the imaging steps and simulation results, which validate the method, are presented.

关 键 词：线性高频 成像 合成孔径雷达 去斜率 高距离分辨率 距离像 

分 类 号：TN959[电子电信—信号与信息处理]