针对多普勒测风激光雷达系统的应用需求，研制了一套结构紧凑、操作灵活的Pound-Drever-Hall(PDH)激光稳频系统。直接数字频率合成器(DDS)产生激光器高频相位调制信号，模拟混频器解调激光器的频率漂移信息，高集成度的数字信号处理器(DSP)作为稳频控制系统的心脏，负责整个稳频系统的总线控制、信号处理及比例积分微分(PID)伺服等。实验表明，在2.5 h内激光器的相对频率漂移不超过±17 kHz，其均方根(RMS)误差为5 kHz，绝对频率稳定度优于200 kHz。在主动对法布里珀罗干涉仪(FPI)施加6 Hz固定扰动时，系统能够在30 ms内迅速恢复稳定。满足直接探测多普勒测风雷达系统中0.1 m/s测风精度的应用需求。

A laser frequency stabilizing system for Doppler lidar wind measurement is developed, which has the advantages of compact structure and flexible operation. The radio frequency modulating signal is generated by the direct digital frequency synthesizer (DDS), the laser frequency drifts are demodulated by the analog mixer, and the functions of the bus controlling, signal processing and proportional-integral differential (PID) servo controlling are implemented by the high integrate chip of digital signal processor (DSP) as the heart of the frequency stabilizing system. The measured laser frequency drifts are less than ±17 kHz during 2.5 h, and whose root mean square (RMS) error is 5 kHz, and absolute frequency stability is better than 200 kHz. The anti-interference performance is also measured. The system will take 30 ms to get back into stabilization when a regular disturbance with the frequency of 6 Hz is put on the Fabry-Perot interferometer (FPI). The system can be applied to Doppler lidar wind measurement.