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介绍了一套自行研制的双视场激光雷达系统的原理、结构、关键技术及其性能。该激光雷达系统采用两个独立的接收视场,一个采用离轴收发光学系统探测高空大气,另一个采用同轴收发光学系统探测低空尤其是大气边界层大气。激光雷达系统的数据采集单元对高空大气同时进行模拟数字信号探测和光子计数信号探测,有效地改善了激光雷达系统因回波信号的动态范围过大而无法兼顾高低空同时探测的缺点。对本系统接收的大气回波信号进行拼接和反演,结果表明,该系统能够有效获取大气气溶胶光学特性。通过与本地区另一台激光雷达信号进行对比验证了该系统探测信号的可靠性。
This paper introduces the principle, structure, key technology and performance of a self-developed dual-field laser radar system. The LIDAR system uses two independent receiving fields of view, one using the off-axis optical system to detect the upper atmosphere, and the other using the coaxial optical system to detect the atmosphere at low altitude, especially the atmospheric boundary layer. The data acquisition unit of LIDAR system simulates the digital signal and the photon counting signal in the upper atmosphere at the same time, which effectively improves the shortcomings of Lidar system because the dynamic range of the echo signal is too large to detect at the same time. The atmospheric echo signals received by the system were spliced and inverted. The results show that the system can effectively obtain aerosol optical properties. The reliability of the system detection signal is verified by comparing with another laser radar signal in this area.