基于“匹配滤波+序列估计”模式的新型长周期伪随机码快速捕获方案

A novel long-period PN-code fast acquisition scheme based on digital matched filter plus sequential estimation mode

在扩频通信测距复合系统中,伪随机码捕获速度对系统整体的性能(尤其在测距的实时性和测距精度方面)有着至关重要的影响.本文提出了一种改进的长周期伪随机码快速捕获方案———一种基于"匹配滤波器+序列估计"模式的双级捕获方案,该方案通过利用匹配滤波器对复合序列内码的高效捕获,明显提高复合系统在低信噪比的信道环境下对长周期伪随机码的捕获速度.通过对该捕获方式的系统性能仿真,证明了该捕获方式对复合系统捕获实时性、捕获准确性等技术特性的提升.

In spread spectrum communication and distance estimation multiplex system, the speed of PN-code acquisition influences the performance of system significantly, especially in the real time and precision of the distance estimation. This paper presents a novel long-period PN-code fast acquisition scheme which is based on 'match filter + sequence estimation'approach. Using the efficient acquisition of multiplex sequence at match filter, this scheme improves the acquisition speed of long-period PN-code for the multiplex system in low SNR environment significantly. The simulation result of the system performance proves the improvement of the acquisition real time and acquisition precision.