目标抽取算法对线性调频步进信号距离像栅瓣的影响分析  

Analysis of Effect of Target Extraction Algorithms on Grating Lobes in Stepped-frequency Chirp Signal Imaging

作　　者：夏荣青[1] 张群[1] 宋元鹤[1] 

机构地区：[1]空军工程大学电讯工程学院,西安710077

出　　处：《弹箭与制导学报》2008年第3期220-222,226,共4页Journal of Projectiles,Rockets,Missiles and Guidance

基　　金：国家自然科学基金(60672032);陕西省自然科学基础研究项目(2007F28)资助

摘　　要：首先介绍了线性调频步进信号合成高分辨距离像的基本原理,从自相关函数的角度分析利用参数设定抑制栅瓣的方法,重点讨论了不同目标抽取算法对距离像栅瓣的影响。对舍弃法进行了改进,改进后的舍弃法对自相关函数栅瓣较小的线性调频步进信号在采样率足够高的情况下,可以达到最优的处理结果,仿真结果证明了理论分析的正确性。The principles of synthesizing high-resolution range profile by stepped-frequency chirp signal were analyzed firstly. Methods of selecting this waveform with low autocorrelation function （ACF） grating lobes were presented. Then the effect of different target extraction algorithms on grating lobes was discussed in detail, a modified method based on ＇ abnegation method＇ was developed, which can achieve the optimal result in case of high sampling , simulation results prove that it is feasible.

关 键 词：线性调频步进信号 栅瓣抑制 目标抽取 

分 类 号：TN957[电子电信—信号与信息处理]