卫星移动通信系统中大频率变化率校正方法研究

Research on the Correct Algorithm of Large Frequency Rate in Satellite Mobile Communication System

本文针对卫星移动通信系统中高速移动终端带来的大多普勒频差和大多普勒频率变化率这一固有难题,提出了采用发送正弦波导频信号实时快速的纠正大的多普勒频率变化率,同时通过系统校频来校正多普勒频差,来克服高速移动终端带来的这两个难题。在校正大的多普勒频率变化率中采用修正Rife算法,把每次的计算出的修正值去快速实时调整收发频率综合器来消除多接收到的大普勒频率变化率,达到频率校正目的。

Aiming at the problem of large Doppler frequency difference and large Doppler frequency rate caused by high speed mobile terminal in satellite mobile communication system, this paper puts forward a solution： sending a sine-wave pilot signal to correct the large Doppler frequency rate, while correcting the Doppler frequency rate via system frequency correc- tion. The modified Rife algorithm is used in correcting high Doppler frequency rate. The modified value calculated each time is used to real time adjust the frequency synthesizer so as to eliminate the excess large Doppler frequency rate and to correct the frequency.