摘要
卫星通信系统信号的传输通常会受多普勒变化的影响,而多普勒的变化会影响解调信号的频率跟踪和相位跟踪。针对直升机卫星通信系统,分析了多普勒变化对直升机卫星信号传输的影响,并对一种多普勒信号模型设计了频率跟踪和相位跟踪的方法。通过理论分析和仿真表明,该方法不仅能够正确完成信号的解调,能够对高动态信号完成频率的正确跟踪,而且能够在较短的时间内完成载波的锁定。
The signal transmission in satellite communication system is influenced by the variation of Doppler.And the frequency tracking and the phase tracking of demodulation signal is also influenced by the variation of Doppler. In consideration of the satellite communication system of helicopter,the influence of signal transmission in helicopter satellite communication system is analyzed for the variation of Doppler. And the method of the frequency tracking and the phase tracking is designed for a signal model. A theoretical analysis and simulation indicate that this method can not only accomplish the demodulation of the Doppler signal,but also perform frequency tracking for wide dynamic condition signal exactly.In addition,the locking of carrier can be accomplished in a shorter amount of time.
作者
魏瑞刚
郭燕
WEI Ruigang;GUO Yan(The 54th Research Institute of CETC,Shijiazhuang 050081,China)
出处
《无线电工程》
2018年第7期556-559,共4页
Radio Engineering
基金
国家部委基金资助项目
关键词
卫星通信
多普勒
频率跟踪
相位跟踪
satellite communication
Doppler
frequency Lraeking
phase tracking
