半导体激光云高仪 APD探测器获取的大气气溶胶后向散射信号信噪比较低, 难以直接用于反演云高、垂直能见度等大气参数。针对后向散射信号的这种特点, 提出了一种半导体激光云高仪时序控制和信号处理实现方案, 在完成后向散射信号的高速采集、分段累积平均的同时实现整个系统发射、接收、维护、数据存储和上传等复杂时序控制。经对比实验验证, 该方案工作情况良好, 能够明显提高后向散射信号信噪比、帮助大气参数的反演。

Aerosol backscatter signal of laser diode ceilometer, acquired by using APD detectors, has relative low SNR, which can not be directly used for inversion of atmospheric parameters such as cloud height, vertical visibility. A timing control and signal processing scheme of laser diode ceilometer is presented, aiming at the characteristics of backscatter signal. AD converter performs high speed data acquisition, and then DSP finishes cumulative average. Meanwhile, the complex timing control of the whole system’s transmitting receiving, maintenance, data saving, and uploading is performed. The comparison experiments show that the scheme works well, and can significantly improve the backscatter signal’s SNR to help the inversion of atmospheric parameters.