可编程扩频信号发生器的设计与实现

Design and realization of programmable spreading spectrum signal generator

扩频信号以其特有的优点,在导航系统中,得到了广泛的应用。本文设计了一种基于AD9854和CPLD的扩频信号发生器,它能够产生高稳定性的BPSK调制信号,并具有可编程调频、调相、调幅的功能。文中详细分析了该信号发生器的系统结构、软硬件设计和具体实现电路。实验结果表明,产生的扩频信号具有调制时间短、精度高、频带宽、数字可调等特点,可以满足一般导航系统的要求。

Spreading spectrum signals were widely applied in the navigation systems, with their special features. In this paper, a kind of spreading spectrum signal generator was established mainly based on AD9854 and CPLD. This signal generator could generate highly stable BPSK-modulated signals, whose frequency, phase and amplitude could all be programmed. The system structure, software-hardware design and circuitry for the generator were analyzed in detail. Experiment results demonstrated that the signals, enjoying short modulation time, high precision, wide bandwidth and digital adjustment, could meet the requirements of common navigation systems.