星载单光子激光雷达海洋噪声模型

Noise model of oceanic spaceborne photon counting Lidar

星载单光子激光雷达以超高灵敏度和超高重频的优势,在海洋探测领域展现了广泛的应用前景。雷达系统中的单光子探测器件具有极高的灵敏度,可以探测光子量级的回波信号,同时也极易受太阳背景光噪声影响。由于背景噪声直接影响激光雷达的工作性能,还会对星上原始的数据量产生影响,在卫星系统设计阶段,对噪声强度的准确估计至关重要。本文综合考虑大气后向散射、水面反射及水体后向散射的贡献,建立了一个星载单光子激光雷达海洋噪声的估计模型。以全球首个对地观测星载激光雷达ATLAS为例,在输入系统参数和环境参数后,模型估计的噪声与ATLAS实测噪声误差在15%以内,证实了该噪声模型的正确性。

With the advantage of high sensitivity and high repetition rate,spaceborne photon counting Lidar has shown great application in ocean areas.The photon counting detector can not only respond to the weak echo signal,but is also susceptible to solar radiation.Due to the great impact of background noise on the performance of Lidar systems,as well as the impact on the data volume,accurate estimation of noise level is crucial in the design of satellite Lidar systems.A noise model of oceanic spaceborne photon counting Lidar was proposed that considers the contribution of the atmosphere,water surface,and water column.By inputting the system parameters of the new generation photon counting Lidar ATLAS and the environmental parameters,the MAPEs(mean absolute percentage errors)between estimated noise and the ATLAS measured noise are within 15%,which confirms the effectiveness of the noise model.