关键词：通信；卫星通信；近地轨道；多普勒频移；多普勒补偿
摘 要：In the low earth orbit (LEO) satellite communication systems,in which receiver and transmitter are not fixed and have significant relative velocity,the fast time-varying Doppler frequency shift is high,which degrades the performance of acquisition and tracking.Doppler frequency shift and Doppler frequency rate can be calculated by the terrestrial system based on the satellite orbit and the relative velocity.In this paper,we introduce the Doppler compensation principle and the realization of Doppler shift estimation and compensation on an universal wireless signal processing platform.The experimental results showed that the Doppler compensation model have high accuracy,which is positively correlated with the Doppler frequency rate.