论文以低轨卫星信道为例，给出一种适用于大频偏条件下突发通信系统直接扩频序列混合并行捕获结构，分析了预检测积分时间和判决门限对平均捕获时间的影响，提出了在门限信噪比下以平均捕获时间最小为原则的预检测积分时间和判决门限参数最优设置方案。

A hybrid Parallel PN code acquisition scheme is investigated for burst mode spread spectrum communication with high doppler frequency offset. Based on LEO satellite channel, analysis of post detection integration and detection threshold to average acquisition time are given. Aimed at minimum acquisition time, an optimal threshold and post detection integration are put forward in this paper.