基于二相编码信号的SAR成像  

SAR imaging based on binary-phase codes signal

作　　者：蔡永俊 牛诚翔 Cai Yongjun;Niu Chengxiang(AVIC Leihua Electronic Technology Research Institute,Wuxi 214063,China)

机构地区：[1]中国航空工业集团公司雷华电子技术研究所,江苏无锡214063

出　　处：《电子技术应用》2022年第3期123-128,共6页Application of Electronic Technique

摘　　要：二相编码信号是一种具有扩谱特性的雷达信号,无论是在雷达的探测能力、低截获能力,还是在距离分辨力以及速度分辨力方面,都十分出色。首先介绍常用的二相编码信号形式,然后基于非“停走停”假设推导回波信号的准确表达式,从本质上阐述二相编码信号的脉内多普勒偏移产生的原因,基于此分析相位编码信号的多普勒敏感性,并将其应用于合成孔径雷达(SAR)成像,可以提高其抗干扰能力。通过点目标仿真,验证了本文分析的有效性。Binary-phase codes signal is a kind of spectrum spread signals,which works very well not only in terms of detection capability and low-intercept capability but also the range and velocity resolution.This article firstly introduces common binary-phase codes signals,then deduces the accurate echo representation based on non“stop-go-stop”assumption,expounds the cause of Doppler shift during the pulse in essence,and analyses the Doppler sensitivity of phase-code signal.Finally,it is applied to SAR imaging,which can improve its ability of anti-interference.The validity of the analysis in this paper is verified by point target simulation.

关 键 词：二相编码 多普勒偏移 SAR成像 抗干扰 

分 类 号：P412.25[天文地球—大气科学及气象学]