一种适用于低轨星载通信侦察系统的解调方法  

A Demodulation Method Based on Third-order PLL for LEO Satellite Reconnaissance System

作　　者：巢捷频[1] 李晟[1] 

机构地区：[1]中国西南电子技术研究所,成都610036

出　　处：《电讯技术》2011年第5期42-45,共4页Telecommunication Engineering

摘　　要：介绍了低轨星载通信侦察的特点,针对侦察中多普勒变化率相对信号带宽较大时传统技术无法跟踪和解调PSK信号的问题,提出一种基于改进的三阶锁相环的解调方法和实现途径,并使用该方法研制了解调软件,在实际工程中进行了成功应用,满足了低轨卫星侦察系统对该类信号解调的需求。The characteristics of satellite-based communication reconnaissance is introduced. An improved demodulation method based on third-order phase-locked loop（PLL） is proposed to solve the problem that conventional technology cannot track and demodulate PSK signal when the Doppler changing rate is large relative to signal bandwidth in reconnaissance. With this method, the demodulation software has been developed and applied in practical engineering. This method meets the needs of LEO（ Low Earth Orbit） satellite reconnaissance system for signal demodulation.

关 键 词：低轨卫星 侦察系统 BPSK QPSK 解调 

分 类 号：TN763[电子电信—电路与系统]