中国激光, 2019, 46 (9): 0910001, 网络出版: 2019-09-10
地表反射率及气溶胶光学厚度对星载路径积分差分吸收激光雷达性能的影响 下载: 1016次
Influence of Surface Reflectance and Aerosol Optical Depth on Performance of Spaceborne Integral Path Differential Absorption Lidar
遥感 路径积分差分吸收激光雷达 地表反射率 气溶胶光学厚度 信噪比 相对随机误差 remote sensing integral path differential absorption lidar surface reflectance aerosol optical depth signal-to-noise ratio relative random error
摘要
利用中分辨率成像光谱仪地表反射率产品和欧洲中期天气预报中心的气溶胶光学厚度产品,分析了全球地表反射率及气溶胶光学厚度的分布特征,分析了地表反射率及气溶胶光学厚度对星载路径积分差分吸收激光雷达系统回波功率、探测器输出信噪比、相对随机误差的影响。结果表明:在给定的系统参数下,得到的单脉冲回波功率范围为0.299~321 nW,对探测器动态范围的要求较高;单脉冲回波探测器输出信噪比在13.6 dB以上,累计148次(陆地)/296次(海洋)脉冲的探测器输出信噪比在26 dB以上;相对随机误差高值区出现在撒哈拉沙漠及阿拉伯半岛附近海域,最大相对随机误差达到了0.22%(0.88×10 -6)。
Abstract
The distribution characteristics of global surface reflectance and aerosol optical depth are analyzed using a surface-reflectance product of moderate-resolution imaging spectroradiometer and an aerosol-optical-depth product of European centre for medium-range weather forecasts. The effects of surface reflectance and aerosol optical depth on the echo power, detector output signal-to-noise ratio, and relative random error of spaceborne integral path differential absorption lidar systems are analyzed. Results show that with the given system parameters, the single-pulse echo power range is approximately 0.299-321 nW, which requires the detector to have a high dynamic range. The output signal-to-noise ratio of single-pulse echo detector is greater than 13.6 dB, and the output signal-to-noise ratio of detector with an accumulative 148 times (land)/296 times (ocean) pulse is greater than 26 dB. The high values of relative random error appear in the sea near the Sahara Desert and Arabian Peninsula, and the maximum relative random error is 0.22% (0.88×10 -6).
杨巨鑫, 朱亚丹, 王勤, 卜令兵, 刘继桥, 陈卫标. 地表反射率及气溶胶光学厚度对星载路径积分差分吸收激光雷达性能的影响[J]. 中国激光, 2019, 46(9): 0910001. Yang Juxin, Zhu Yadan, Wang Qin, Bu Lingbing, Liu Jiqiao, Chen Weibiao. Influence of Surface Reflectance and Aerosol Optical Depth on Performance of Spaceborne Integral Path Differential Absorption Lidar[J]. Chinese Journal of Lasers, 2019, 46(9): 0910001.