直序扩频系统一种新的PN码快速捕获算法  

New Fast-acquisition Algorithm of PN code in Direct Sequence Spread-spectrum Systems

作　　者：王妙[1] 左继章 

机构地区：[1]空军工程大学工程学院,西安710038 [2]空军第一试验训练基地,酒泉735018

出　　处：《系统仿真学报》2009年第22期7310-7312,共3页Journal of System Simulation

摘　　要：针对基于辅助序列快捕算法在初始相位偏差较大情况下降导致捕获速度变慢的缺陷,在相位预估器的相干PN序列快捕算法基础上,将最优化搜索引入PN码快捕算法中,提出了一种基于相位预估和最优搜索的相干PN序列快捕算法,通过建立马尔可夫链模型,推导出平均捕获时间及其方差的解析式。仿真结果表明,该算法能有效提高捕获性能,实用性强。The acquisition algorithm presented in [3] degressed when intial phase is inaccurate.We propose a optimum searching method with a Pre-loop Phase Estimator for the fast-acquisition of PN code, the analytic formulation of mean acquisition time and variance is derived by Marokv Model. And the performance of acquisition is simulated in AWGN channel. The result of computer simulation indicates that the algorithm can improve the performance and be more practical.

关 键 词：直序扩频系统 相位预估 最优搜索 快速捕获 

分 类 号：TN914.4[电子电信—通信与信息系统]