一种基于合成带宽技术提高SAR分辨率的新方法  

A New Method for Improving SAR Resolution Based on Synthesized Bandwidth Technique

作　　者：彭岁阳[1] 胡卫东[1] 杜小勇[1] 

机构地区：[1]国防科技大学电子科学与工程学院ATR实验室,湖南长沙410073

出　　处：《信号处理》2010年第1期12-16,共5页Journal of Signal Processing

摘　　要：近年来,一种多chirp脉冲合成大带宽的技术受到雷达界的关注,该方法可以在降低系统瞬时带宽和采样率的情况下提高距离分辨率。针对子脉冲信号的参数如采样率、带宽和频段问隔等可能各不相同的问题,本文提出了采用SINC插值进行信号均匀化重建的方法,并通过前处理方式来实现合成带宽技术在SAR中的应用。最后的仿真实验验证了本文方法适应于参数各不相同的多频段子脉冲信号,能有效提高距离分辨率。Recently, a synthesized high-bandwidth technique about multi chirp pulse signal is concerned by the radar field. This technique can increase the range resolution ,while reduce the instantaneous bandwidth and sample rate requirements of radar systems. Against the problem that parameters of the child pulse signal such as data sampling rate, bandwidth, and band-step may be different, we provide the method of SINC interpolation to reconstruct the uniform sampling signal in this paper, and fulfill the application of synthesized bandwidth technique in SAR by means of fore treatment. At last, the simulation shows that the method is applicable to the multi band child pulse signals with different parameters, and improves the range resolution effectually.

关 键 词：合成带宽 距离分辨率 非均匀采样 SINC插值 前处理 

分 类 号：TN957.52[电子电信—信号与信息处理]