自适应滤波在遥测信号数字化解调中的应用研究  

Researches on the Application of Self-adaptive Filtering to the Digital Demodulation Telemetry Signal

作　　者：刘东华[1] 王元钦[1] 

机构地区：[1]装备指挥技术学院航天测控工程研究中心,北京101416

出　　处：《计算机测量与控制》2005年第5期485-487,共3页Computer Measurement &Control

摘　　要：根据自适应滤波理论, 构建了一个基于最小均方误差(LMS) 算法的单频自适应跟踪器, 论述了该模型在遥测信号数字化处理中实现位同步和解调的基本原理。并以PCM/DPSK信号为例, 分析了多普勒频率对位同步及解调过程的影响。计算机仿真测试结果表明, 此方法位同步精度高, 抗干扰能力强, 解调性能较相干解调优越, 便于软件编程及DSP器件实现, 具有一定的应用价值。According to the theory of self-adaptive filtering,a self-adaptive single frequency tracker based on Least-Mean-Squares algorithm (LMS) is proposed.The basic theory of realizing bit synchronization and demodulation of digital processing telemetry signal by the tracker is discussed. Taking PCM/DPSK for example, the effects by Doppler velocity during the course of bit synchronization and demodulation are analyzed. The computer simulation results show that the method with a bright future for application is good at anti-jamming and better than coherent demodulation and convenient to be realized by software and DSP.

关 键 词：信号数字化 自适应滤波理论 最小均方误差 DPSK信号 数字化处理 多普勒频率 抗干扰能力 DSP器件 基本原理 遥测信号 仿真测试 同步精度 解调性能 软件编程 应用价值 位同步 跟踪器 PCM 计算机 单频 相干 

分 类 号：TN949.27[电子电信—信号与信息处理] TN713.8[电子电信—信息与通信工程]