GMSK调制技术及其在遥测中的应用分析

GMSK Modulation Technique and Its Application in Telemetry

高斯最小偏移键控(GMSK)调制技术是一种高频谱效率的调制方式。研究了GMSK的基本原理及其调制解调技术。在仿真环境下对GMSK的调制、解调和同步模块建立了仿真模型,分析了其频谱和误码特性,并与脉冲编码调制-调频(PCM-FM)、四相移相键控(QPSK)比较。仿真结果表明GMSK具有更好的频谱特性,通过选择合适的高斯滤波器归一化带宽(BT)指数,可获得解调性能与带宽效率的折中。分析了GMSK调制解调技术在遥测中的应用。

GMSK is a modulation technique with high spectrum - efficiency. The basic principle of its modulation and demodulation is analyzed. A simulation model of modulation, demodulation and synchronization is established. The characteristics of its power spectral density and bit error rate are analyzed, and it is compared with PCM - FM and QPSK. The simulation results show that GMSK has better spectral characteristics. By selecting a proper BT factor, it will achieve a compromise between demodulation performance and bandwidth efficiency. Finally, an analysis on the application of GMSK modulation technique in telemetry is provided.