频偏估计与相位处理相融合的新型载波恢复算法

A Novel Carrier Recovery Algorithm Based on the Integration of Frequency Offset Estimation and Phase Processing

针对低轨卫星下行信号存在大多普勒频偏、载波同步难的问题,运用载波频偏开环盲估计算法,并结合一种新的基于相位处理的基带锁相算法,提出一种新颖的MPSK类全数字接收机载波恢复算法。仿真结果表明,该算法能够对大频偏、低信噪比的MPSK类调制信号快速完成载波同步,且具有良好的误码性能,算法易于工程实现,适用于低轨卫星下发的遥感、遥测、移动通信等信号的接收。

A novel carrier recovery algorithm of all digital receiver for MPSK signal is proposed for LEO satellite signals with large Doppler-shift.The proposed algorithm includes the open-loop carrier frequency offset blind estimation and a new baseband phase-locking algorithm based on phase processing.Extensive simulation shows that it realizes fast capture of the carrier frequency, and has a good BER performance for the large frequency offset,low SNR MPSK signals.It is suitable for the reception of remote sensing signal,telemetry signal and mobile communication signal sent by the LEO satellite.