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风场数据是平流层飞艇实现长时驻空和飞行控制的重要参数。针对平流层空气稀薄、传统机载压力式测风速方法测量精度低等问题,提出一种利用激光雷达直接探测技术的平流层飞艇机载风速测量方法。设计了基于直接探测原理的多普勒激光雷达测风速系统,构建了分别以FP(IFabry-Perot干涉仪)和MZ(IMach-Zehnder干涉仪)为鉴频器的条纹成像技术的风速反演数学模型,并进行了数值仿真分析。结果显示,在355 nm波长出射激光和20 m/s径向风速条件下,FPI-条纹成像技术与MZI-条纹成像技术的径向风速测量误差分别为11.0%和6.5%,测量分辨率分别为1.90 m/s和1.62 m/s,表明该方法能够满足平流层飞艇机载风速测量要求。
Wind field data is an important parameter for stratospheric airships to achieve long-term airspeed and flight control. Aiming at the problems of stratospheric air thinning and traditional airborne pressure wind velocity measurement method with low accuracy, a method of airborne wind speed measurement of stratospheric airship using laser direct detection technology is proposed. The wind velocity system of Doppler Lidar based on direct detection principle is designed and the wind speed inversion maths of fringe imaging technique using IF (IFabry-Perot interferometer) and MZ (IMach-Zehnder interferometer) Model, and carried out numerical simulation analysis. The results show that the radial error of FPI-stripe imaging and MZI-stripe imaging are 11.0% and 6.5%, respectively, at 355 nm laser beam and 20 m / s radial wind speed. The measurement resolution is 1.90 m / s and 1.62 m / s, respectively, indicating that this method can meet the requirements of airborne wind speed measurement of the stratospheric airship.