一种PN码快速捕获的方法  

A New Method of PN Code Rapid Acquisition

作　　者：张起晶[1] 孙桂芝[1] 

机构地区：[1]黑龙江科技学院,黑龙江哈尔滨150027

出　　处：《现代科学仪器》2011年第6期104-106,共3页Modern Scientific Instruments

摘　　要：该文研究低信噪比情况下DS/SS系统中的序列捕获问题,提出来一种快速捕获的方法。该方法是在普通的非相干带通相关检测器基础上,增加了一个重复累加装置,相关峰值周期后,若未捕获信号,重新相关捕获,且相关值与上次相关值累加。研究表明,此方法可以提高信噪比,因此减少了捕获时间.在给定的仿真条件下,运行了仿真程序,得到了预期的结果。The theroy of DS/SS code acquisition in the case of low signal to noise ratio（SNR） was presented in this study.We proposed a rapid acquisition method.a repeat-accumulate unit was added based on general non-coherent band-pass correlation detector.After Correlation peak,if the signal was not captured,the re-capture was started,then the correlation value added the previous cumulative value.The study showed that it can improve the signal to noise ratio and reduce the capture time.The simulation program was run,it has gotten the desired results.

关 键 词：捕获时间 信噪比 累加 

分 类 号：TN914.3[电子电信—通信与信息系统]