PN码快速捕获中的捕获策略和性能分析

在现有的各种PN码捕获策略的基础上,提出了PN码捕获策略的统一框架,并以该框架为基础研究了捕获过程各个阶段中策略的选择对总体捕获性能的影响.最后研究了各个阶段中可以采用的若干种判决策略和验证策略,并对四种实际可能采用的捕获策略进行了仿真分析.结果表明在捕获过程中引入适当的验证策略可以在平均捕获时间增加不多的情况下大幅改善捕获的性能,而提出的一种无需设定门限的捕获策略与利用门限进行判决的策略性能相当,在实际工程应用中有着重要的意义.

Acquisition strategy and performance analysis for fast PN code acquisition

A general framework of PN code acquisition strategy is introduced,and the impact on total acquisition performance when choosing different strategy in each stage is studied based on that framework.Then several decision and verifying strategies that may be used in each stage are studied and four acquisition strategies are presented.Simulation result shows that acquisition performance can be greatly improved by introducing proper verifying strategy during acquisition,while average acquire time only increases slightly.Finally,the performance of the threshold-free acquisition strategy introduced is close to that of the traditional threshold decision strategy.