基于随机步进频信号的MIMO波形设计和成像方法  

MIMO Radar Waveform Design and Imaging Based on Random Stepped Frequency Signal

作　　者：张旭峰 黎湘[1] 朱玉鹏[1] 

机构地区：[1]国防科技大学电子科学与工程学院

出　　处：《现代雷达》2011年第10期28-32,共5页Modern Radar

摘　　要：基于MIMO雷达系统的宽带雷达成像是空间感知领域一个很有前景的研究方向。波形设计是宽带MIMO雷达系统需要解决的首要问题。对于MIMO宽带信号一般要求各雷达发射信号相互正交且自相关函数具有窄的主瓣和低旁瓣特性。文中详细分析了随机步进频信号自相关函数的统计特性,证明大的步进频数利于MIMO雷达成像,进而提出了一种基于遗传算法的MIMO波形设计方法,该算法中利用随机频率编码矩阵生成遗传算法的初始种群。最后将所设计的波形用于MIMO雷达成像的仿真实验,其结果证明了文中的波形设计方法可以有效降低MIMO雷达系统中不同通道之间的相互干扰,利于雷达成像。MIMO radar imaging which integrates wideband signal processing with MIMO radar system is a potential technology for remote sensing. Waveform design is a principal important issue before radar imaging successfully in MIMO. There are two main requirements for the waveform used in MIMO radar imaging： the signals should be orthogonal and its auto-correlation function should have low side lobe noise and narrow main lobe. In this paper, statistical characteristics of random stepped frequency （RSF） signal＇s auto-correlation is detailed analyzed, and the suitability of large stepped frequency number for MIMO imaging radar is proved. Then a method for designing random stepped frequency-ceding waveforms by genetic algorithm is presented here, where a random matrix is used for initializing the genetic algorithm. In the end, the emulator result of applying the waveforms designed above in MIMO radar imaging proves that it is suitable for overcoming interfere among channels and imaging target.

关 键 词：MIMO雷达 雷达成像 波形设计 遗传算法 

分 类 号：TN958[电子电信—信号与信息处理]