高动态环境中伪码锁相环设计

Design of Pseudo-noise Code PLL in High Dynamic Condition

伪码相位的精确稳定跟踪是扩频通信系统的关键问题.在高动态、低信噪比环境下,伪码锁相环的设计更为困难.在介绍数字化伪码锁相环的组成和工作原理基础上,对高动态环境应用要求下环路滤波器的特性进行了详细分析;并在一种数字化扩谱接收机中,完成了伪码的精确跟踪.

In spread spectrum communication system, tracking the phase of the pseudo-noise code accurately and steadily is the essential part. It is more difficult to design the pseudo-noise code PLL(phase-locked-loop) in high dynamic condition. On the basis of introducing the composition and the theory of digital pseudo-noise code PLL, the paper analyzes the characteristics of the PLL filter in high dynamic condition in detail. At the same time, the paper designed and accomplished the pseudo-noise code PLL in a kind of digital spread spectrum receiver.