基于DDS的宽带雷达回波信号模拟技术研究  

Research on the simulation of the characteristic signal of the wide band radar target based on DDS

作　　者：刘朝军[1] 王伟[1] 邱兆坤[1] 陈曾平[1] 

机构地区：[1]国防科技大学ATR国防科技重点实验室,湖南长沙410073

出　　处：《系统工程与电子技术》2005年第9期1497-1499,1538,共4页Systems Engineering and Electronics

基　　金：国家"863"高技术计划基金资助课题(2002AA731130)

摘　　要：针对宽带线性调频体制雷达,提出了一种目标中频回波信号的模拟方法。通过分析雷达回波的去斜率解调原理,得到目标中频回波信号的特征表达式。然后利用直接数字合成(direct digital synthesize,DDS)技术生成数字载频,用数字信号处理器(digital signal processor,DSP)计算目标的基带特征数据,采用正交数字上变频的方法,产生目标的中频回波信号。文中对相关技术作了比较详细的介绍,给出了模拟系统的结构框图。经过高性能示波器和目标特征提取软件对信号的分析,证明了该方法模拟目标中频回波的有效性。Aimed at wide-band LFM（linear frequency modulation） radar, a method to simulate the target＇s IF （intermediate frequency） echo signal is brought forward. Via the analysis of the demodulation of radar echo, the expressions of the target＇s IF echo is got, Then, the digital carrier frequency is genearted by DDS, the based-band charaeteristie data is calculated by DSP, and through quadrature DUC （digital up frequency conversion）, the IF echo signal is produced. In this article, the related techs is introduced in detail, and the frame map is presented. Through the analysis by high performance oscillograph and character distilling softwares, the validity of this merthod to simulate radar IF echo is proved.

关 键 词：雷达 模拟器 直接数字合成 正交数字上变频 

分 类 号：TN957.51[电子电信—信号与信息处理]