摘要
在复合系统通信中,飞行器的高动态使扩频信号存在多普勒频移。对于存在较大多普勒频移的扩频信号,采用传统的捕获方法,整个捕获过程非常困难。由信号产生原理可知,直扩信号同时隐含了符号与码元的周期性,具有二阶循环平稳性。利用循环谱理论对接收端扩频信号的载频进行实时估计,然后将载频估计值传于锁相环,再用锁相环完成载频的锁定和跟踪,可以解决在高动态环境下锁相环载频跟踪的问题。
In the communication of multiplex system, the DS signal exists Doppler frequency shift for the high dynamic situation of aerocraft.And the DS signal of larger Doppler frequency shift is also captured difficultly,using the traditional method.For the making principle of signal,the DS signal contains the periodicity of symbol and code.And it is a second order cyclostationary signal. In the paper,the real-time carrier of DS signal is estimated by cyclic spectrum theory.Then the estimated carrier is sent to the ...
出处
《舰船电子工程》
2007年第1期8-9,99+195,共4页
Ship Electronic Engineering
基金
舰舶行业基金资助项目(编号:05J3.7.2)
关键词
复合系统
循环平稳
锁相环
多普勒效应
multiplex system
cyclostationary
phase-locked loop
Doppler
