基于DMF和多码元累加判决的扩频捕获方法

本文提出了基于匹配滤波器PN码捕获、改进的多码元累加门限判决以及多驻留捕获验证的统一框架,运用建模和统计分布的数学方法分析了整个系统的检测概率、虚警概率、平均捕获时间三个最重要系统指标。仿真表明,多码元累加方法有效提高检测概率,通过选择合适的累加次数N,可逼近系统的最优的捕获特性,在工程设计中具有重要意义。

Acquisition Method of Spread Spectrum Code Based on DMF and Multi-symbol Accumulation Cell

This paper proposes a unified framework of PN code acquisition, including acquisition -method based on digital matched filter, threshold detection using the method of multi - symbol accumulation cell, instead of multi-dwell verification model. The three, most important system indexs including detection probability, false alarm probability, average acquisition time, are analysed by the method of mathematical modeling and statistical distribution. And simulation result of the three acquisition system indexs is offerd and discussed. At last the simulation result proves that multi-symbol accumulation can improve detection probability significantly and selecting appropriate parameters can approxi- mate optimal characteristics of the acquisition system.