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移动式多普勒激光雷达在外场实验过程中,考虑到工作平台的随机性,测量坐标系很可能不再是地面参考坐标系,这为三维矢量风场的反演带来困难。提出采用三维空间坐标旋转变换的方法建立了测量坐标系与地面参考坐标系的一般关系式,并进一步导出了反演三维风场的普遍公式。此外,在光束扫描过程中,由于二维扫描仪加工精度等的限制,光束存在一定的定向误差。采用Monte-Carlo模拟方法定量研究了光束指向偏差引起的风场测量误差,结果表明,当水平风速为100m/s时,1°的光束定向误差引起的水平风速大小误差为0.712m/s,方向误差为0.704°,与理论计算结果一致。理论分析结果还表明:当水平风速为100m/s时,1°的光束最大定向偏差引起的水平风速大小的最大偏差为1.16m/s,方向最大偏差为1°。
In the field experiment of mobile Doppler lidar, taking into account the randomness of the working platform, the measurement coordinate system is probably no longer the ground reference frame, which makes it difficult to retrieve the 3D vector wind field. In this paper, the general relationship between the coordinate system of measurement and the reference frame of the ground is established by the method of three-dimensional coordinate rotation transformation, and the general formula of three-dimensional wind field inversion is further derived. In addition, during the beam scanning process, due to the limitation of the processing accuracy of the two-dimensional scanner, the beam has a certain orientation error. The Monte-Carlo simulation method was used to quantitatively study the measurement error of the wind field caused by the deviation of the beam pointing error. The results show that when the horizontal wind speed is 100m / s, the error of horizontal wind speed caused by 1 ° beam orientation error is 0.712m / s, The error is 0.704 °, which is consistent with the theoretical calculation. The theoretical analysis also shows that when the horizontal wind speed is 100m / s, the maximum deviation of the horizontal wind speed caused by the maximum directional deviation of 1 ° beam is 1.16m / s and the maximum deviation of the direction is 1 °.