遥测扩频接收机中的检测后积分技术研究  

Research on Post Detection Integration Methods for the Telemetry Spread Spectrum Receiver

作　　者：刘晓明[1] 刘沙[1] 吴皓威[1] 

机构地区：[1]重庆大学通信工程学院,重庆400030

出　　处：《计算机技术与发展》2009年第10期226-229,共4页Computer Technology and Development

基　　金：与某公司合作项目"机载扩频系统"(JW20*2007052)

摘　　要：针对遥测扩频系统要适应各种多普勒频移和动态容忍度的问题,研究了存在频率误差情况下的检测后积分(PDI)伪码捕获技术,提出了一种采用部分匹配滤波器与PDI技术结合的实现方案。在进行详细理论分析的基础上,将该技术与传统的非相关检测后积分(NCPDI)进行对比仿真。结果表明该方法可以明显降低系统误码率,有效地提高扩频通信系统性能,同时这种性能的提高在实际实现时所带来硬件开销也比较小,从而具有很好的实用性。Aeeording to the fact that the telemetry spread spectrum receiver need meet Doppler frequency offset and dynamic tolerate degrec, it is studied that the post detection integration for code acquisition in the presence of phase and frequency uncertainty. A code acquisition architecture by using partial - matched filter with post detection integration is presented. Then the theoretical analysis is given and simulation tests of proposed acquisition algorithm are carried out. Performance is also contrasted to the conventional noncoherent PDI techniques,to reveal significant gains in favor of the proposed methods.

关 键 词：检测后积分 伪码捕获 似然比校验 

分 类 号：TN914.42[电子电信—通信与信息系统]