基于改进CMA+MMA的直达波脉冲复包络估计技术  

Complex Envelope Estimation Techniques of Direct-path Pulse Signals Using Modified CMA+MMA

作　　者：葛先军[1] 何友[2] 宋杰[2] 

机构地区：[1]海军航空工程学院科研部,山东烟台264001 [2]海军航空工程学院信息融合技术研究所,山东烟台264001

出　　处：《现代雷达》2010年第12期54-59,共6页Modern Radar

基　　金：国家自然科学基金资助项目(61002045)

摘　　要：直达波参考信号在传输过程中经常会受到噪声、地杂波和多路径干扰的影响,造成信号失真,从而对非合作双基地雷达的性能产生影响。为了恢复脉冲制非合作双基地雷达中的直达波参考信号,考虑采用盲均衡技术重构直达波参考信号。针对直达波信号脉冲持续期间模值恒定、脉冲间歇期内模值为零的包络特性,讨论了盲均衡算法中的恒模算法(CMA)和多模算法(MMA)的特点及其应用条件,在此基础上提出了改进的CMA+MMA算法,仿真结果表明改进的CMA+MMA算法比CMA算法均衡后的互相关函数尖峰更窄,能进一步提高CMA算法对直达波脉冲的均衡性能。The direct-path reference signal is affected by noise and multi-path interference signals,which could cause signal distortion and further influence the performance of non-cooperative bistatic radars.In order to restore the direct-path reference signal of non-cooperative bistatic pulse radar,the techniques of blind equalization are researched.Because the modulus of the direct-path signal is constant when the direct wave pulse is sustained,and is zero when the direct wave pulse is broken,the CMA and MMA algorithm in blind equalization algorithms are chosen as the proper algorithm.On the basis of the two algorithms,a modified CMA＋MMA algorithm is proposed.The simulation results show that the spikes of cross-correlation function of the improved CMA＋MMA algorithm is narrower than CMA algorithm after equalization,and the modified algorithm could further enhance the equalization property of direct wave pluse.

关 键 词：非合作 双基地雷达 直达波 盲均衡 

分 类 号：TN953[电子电信—信号与信息处理]