双基地多载频MIMO雷达的直达波时间同步方法研究  

Study on Time Synchronization Methods Using Direct-Path Wave of Bistatic Multi-Carrier-Frequency MIMO Radar

作　　者：杨明磊[1] 陈伯孝[1] 强勇[2] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,西安710071 [2]西安电子工程研究所,西安710100

出　　处：《航空兵器》2011年第5期7-12,共6页Aero Weaponry

基　　金：国家自然科学基金(61001209);中央高校基本科研业务费专项资金(JY10000902010);航空科学基金(20100181010);长江学者和创新团队发展计划(IRT0954)资助项目

摘　　要：建立了双基地多载频MIMO雷达的直达波信号模型并分析其特点,参考AM电路解调中常用的峰值包络检波电路,提出了一种新的二值包络检波法,该方法根据适当的门限和充放电时间将信号包络归一化为0,1两个值,以此来检测脉冲信号的上升沿和包络;对滑窗积累法进行循环扩展使其适用于脉宽较宽的准FMCW情况;针对信噪比很低的情况,提出了采用相关检测法来提取时间同步信号;最后对三种方法的运算量和性能进行了比较分析。The direct-path wave signal model of bistatic multi-carrier-frequency （MCF） MIMO radar is constructed and its characteristics are analyzed. A novel binary envelope detection method is proposed using the envelope detection circuit in AM demodulation as reference. This method normalizes the signal envelope to two value, 0 or 1, to detect the rising edge and envelope. The slipping window accumulation method is circularly extended to be suit for the FMCW pulse signal with wide pulse-width. The correlative detection method is proposed to obtain the time synchronization in case of low signal to noise ratio （SNR）. Finally the computational complexity and performance of the three methods are analyzed and compared.

关 键 词：多载频MIMO雷达 双基地 直达波 时间同步 二值包络检波 相关检测法 

分 类 号：TN958.5[电子电信—信号与信息处理]