一种CCD PN码快速捕获方法

A RAPID ACQUISITION SCHEME FOR PN CODE BY CCD

本文提出了一种以微处理机为控制器的电荷耦合器件(CCD)正交双通道PN码快速捕获方法,该方法能对不同码型、码长、码速率的PN码所调制的二相PSK直扩信号进行解扩,且具有体积小、重量轻、易于集成化、功耗低的特点。用国产 BAD-32作出了硬件电路,并将统计信号处理理论应用于PN码的同步自相关峰的检测中,分析了 CCD正交双通道PN码快速捕获方法的快捕特性,给出了计算机模拟结果。结果表明,该方法对于码长为127的PN码,在信噪比为-8dB的情况下,其捕获概率在高的门限值上可达90％以上。

This paper presents a rapid acquisition scheme for PN code with double-channel by microprocessor controlled In-phase and Quad-phase CCD. A hardware circuit is made by means of domestic BAD-32. Statistical signal processing theory is applied to analyze autocorrelation peak timing detection of PN code. The rapid acquisition characteristics of this scheme are analyzed theoretically, and computer simulation is given. The results show that with input SNRi = - 8dB, the detection probability of the scheme is more than 90% for a PN code with a code-length of 127.