基于循环前缀的相位编码OFDM雷达多普勒频移估计和补偿

Cyclic Prefix Based Phase-coded OFDM Radar Doppler Offset Estimation and Compensation

相位编码正交频分复用(PC-OFDM)雷达是近年来新体制雷达研究热点之一。该雷达信号对正交多载频进行相位调制,同时具有距离、多普勒高分辨。然而,PC-OFDM雷达对多普勒频偏较为敏感,该文研究了PC-OFDM雷达基于循环前缀(CP)对多普勒频偏进行估计,并基于估计值对频偏进行补偿,再进行脉冲压缩。仿真实验证明,该文方法能有效改善多普勒频偏所带来的1维距离像结构破坏和旁瓣抬升。

Phase-Coded Orthogonal Frequency Division Multiplexing （PC-OFDM） radar has drawn wide attention in high resolution radar application. This kind of radar signM transmits orthogonal sub-carriers phase-modulated by specific sequences and has range and Doppler high resolution at the same time. Considering its sensitivity to Doppler offset, this paper derives the pulse compression method of PC-OFDM radar, and based on Cyclic Prefix （CP）, a Doppler offset estimation and compensation algorithm is proposed. Several simulations verify the effectiveness of the method in improving High Resolution Range Profile （HRRP） with Doppler offset.