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介绍了直接探测瑞利测风激光雷达工作及风速反演的原理,说明了激光雷达接收机的内部结构及工作情况。为修正雷达接收机中分光片分束比、单光子计数器探测率等参数与设计值的偏差所导致的风速测量误差,提出了随光强变化比较两信号通道的计数值的接收机校准方案。实验测得了校准系数随信号通道信号强度的变化关系。在弱光下该系统两信号通道性能差异小于25%。在当前系统的标准具透过率条件和对称的风场扫描合成方式下,接收机校准只对系统透过率曲线和径向风速的测量有较大影响,对合成风场没有影响。
The principle of directly detecting Rayleigh wind lidar and wind speed inversion is introduced, and the internal structure and working conditions of the laser radar receiver are described. In order to correct the measurement error of wind speed caused by the deviation between the design parameters and the parameters such as beam splitting ratio, single-photon detection rate and so on, a receiver calibration scheme was proposed to compare the count value of two signal channels with the light intensity. Experimentally measured the calibration coefficient with the signal channel signal strength changes. Under low light, the performance of the two signal channels is less than 25%. In the current system of standard transmittance conditions and symmetric wind field scanning synthesis, receiver calibration has only a greater impact on the measurement of the system transmission rate and radial wind speed and has no effect on the resultant wind field.