短周期伪码捕获算法的改进与实现  

Improvement and Realization of Short Period PN Codes Acquisition Algorithm

作　　者：陈忠辉[1] 洪惠群[1] 陈新[1] 

机构地区：[1]福州大学物理与信息工程学院,福建福州350002

出　　处：《现代电子技术》2009年第5期23-27,共5页Modern Electronics Technique

基　　金：福建省教育厅资助项目(JB06062)

摘　　要：针对信号经过恶劣的通信环境和复杂的信道后,其信噪比在一定范围内变化,传统的扩频捕获方法中固定门限不能有效地解决由于接收信号的功率变化而造成的虚警、漏警等捕获问题,提出了一种改进的短周期伪码捕获算法。该算法利用带内外信号功率谱密度在捕获同步前后的变化情况,对捕获算法进行改进。采用基于接收信号功率变化的自适应门限算法,特别适合在通信环境恶劣的信道中使用。仿真结果证明了该算法的效果。After signals went through a bad communication conditions or a complex signal path, their SNR could change within a range. Conventional spread spectrum acquisition methods couldn＇t resolve the acquisition problems which caused by the received signals power change, such as false alarm and false dismissal. A novel method to improve the short period PN codes acquisition algorithm,which utilizes the changes of power spectral density between in - sync and out - of - sync, and an adaptive threshold adjustment technology which based on the average power spectral density of received signals are proposed. The method is suitable for bad communication environment specially. The Simulation results are given.

关 键 词：功率谱 自适应门限 同步 捕获 

分 类 号：TN914.42[电子电信—通信与信息系统]