频偏条件下基于DMF伪码捕获性能分析

Analysis on Acquisition Performance of PN Code Based on DMF Under the Condition of Frequency Offset

基于数字匹配滤波器(DMF)的PN码捕获电路具有较快的捕获速度,但其输出主相关峰值对频偏较为敏感,在频偏条件下,通过推导PN码同步时的检测概率和虚警概率,进而计算出平均捕获时间,并且作出了仿真和分析,为改善频偏条件下捕获性能提供了解决思路和理论依据。

The PN Code acquisition circuit based on DMF can accelerate the process of PN code acquisition.But the maximum correlation value is sensitive to frequency offset. The detection probability and false alarm probability are derived at first, and then obtain the mean acquisition time under the condition of frequency offset. Finally the result of simulation and analysis are given. Therefore the research of this paper provide the solution and theory basis for the better acquisition performance under the condition of frequency offset.