摘要
残余载波调制是卫星测控中的常用调制体制。文章从理论上给出了该体制下信号的功率谱密度表达式,得到奇次谐波谱线展宽等结论,并通过仿真和实验进行了验证。利用所得结论讨论了遥测调制度测量方法,提出通过功率谱的2阶边带进行测量可以使结果得到改善。
Residual carrier modulation is commonly used in satellite TT＆C system. In this paper, the expression of power spectrum of modulated signal is derived theoretically,and conclusions including spectrum spread of odd order harmonics are demonstrated by simulations and experiments. The measurement of telemetry modulation index is discussed, and a new method using 2^nd order sideband is proposed to improve measurement results.
出处
《航天器工程》
2008年第3期71-77,共7页
Spacecraft Engineering
关键词
残余载波调制体制
功率谱
基带信号
遥测调制度
residual carrier modulation
power spectrum
baseband signal
telemetry modulation index
