动态环境下数字化DS/BPSK接收机捕获电路

Acquisition Circuit of Digital DS/BPSK Receiver Operating in Dynamic Situation

提出了一种全数字化扩频序列捕获电路 ,建立了接收机动态环境下捕获电路的数学模型 ,分析了多普勒频移、伪码相位差和信号载噪比对电路捕获性能的影响 .提出了一种提高电路捕获性能的改进方案 .分析表明改进后的捕获电路具有检测概率高和虚警概率低的特点 。

A digital DS/BPSK code acquisition circuit is proposed, and the mathematics model is derived when the receiver operates in high dynamic situation. The effect of Doppler frequency shift and PN phase error on the acquisition performance is analyzed. A scheme used to improve the probability of detection, and decrease the probability of false alarm is introduced. According to the analysis, the improved digital code acquisition circuit has higher probability of detection and lower probability of false alarm, and can be adopted for shortening the acquisition time effectively.