基于斜程传输模型的卫星激光测距在气溶胶中探测性能的研究  

Research on the Detection Performance of Satellite Laser Ranging in Atmospheric Aerosol Based on the Slanting Transmission Model

作　　者：陈煜丰 安宁[1] 韩兴伟[1] 刘承志[1] 范存波[1] 温冠宇[1] 宋清丽[1] 董雪[1] 

机构地区：[1]中国科学院国家天文台长春人造卫星观测站,长春130117 [2]中国科学院大学,北京100049

出　　处：《光子学报》2017年第11期198-204,共7页Acta Photonica Sinica

基　　金：国家自然科学基金青年科学基金(No.61605220);吉林省科技厅基金(No.20170520155JH)资助~~

摘　　要：基于大气气溶胶在空间的不均匀分布,提出并利用激光在大气气溶胶中的斜程传输模型开展卫星激光测距在气溶胶中探测性能的研究,即将气溶胶的分布分为水平及垂直方向,在垂直方向将其分为无穷多层,令每层气溶胶的水平方向浓度分布均匀,结合气溶胶粒子的散射截面、尺度分布函数,计算激光在每层气溶胶中的透过率,最后进行积分得到激光的大气传输透过率.结果表明,与Kim经验公式及Mie理论模型相比,由斜程传输模型计算得到的激光气溶胶透过率更接近实验值,其平均相对误差降低了一个数量级,仅为3.5%,表明该模型可准确地计算激光在气溶胶中的传输特性.结合激光雷达公式,利用该模型对气溶胶中不同轨道高度卫星探测成功率进行数值模拟仿真,发现在轻霾环境中低轨卫星的探测成功率可达40%以上,高轨卫星的探测成功率仅为15%,可利用高效率探测器与高能量激光器实现轻霾环境下的卫星激光测距.研究结果能合理解释已有的实验报道并有效地预估卫星激光测距系统探测性能,为系统的升级改造提供可靠的理论依据和技术保障.Due to the uneven distribution of atmospheric aerosol, the detection performance of Satellite Laser Ranging in atmospheric aerosol is researched based on the Slanting Transmission Model of the laser transmitted in atmospheric aerosol. The distribution of aerosol is divided into horizontal and vertical directions. The vertical direction is divided into infinite layers and the horizontal direction of each layer is regarded as the uniform distribution. Combining the scattering cross section and the scale distribution function of the aerosol particles, calculates the transmittance of the laser in each layer of aerosol, and integrals the atmospheric transmission of the laser finally. Compared with the empirical formula and Mie theory model, the transmittance value of laser in atmospheric aerosol calculated by Slanting Transmission Model is closer to the experimental value and the average of relative errors is only 3.5%, reducing by an order of magnitude, which indicates that the Slanting Transmission Model is suitable for calculating the relationship between the laser transmittance in aerosol, aerosol visibility, and telescope elevation. Combined with the lidar formula, the Slanting Transmission Model is used to simulate the satellite detection probability of different orbital in aerosol, the results demonstrate that the detection probability of MEO and LEO satellites are more than 40%, but the GEO satellites is only 15%. And the Satellite Laser Ranging in light haze can be realized by the detector with high detection efficiency and the laser with high power. The results can give a reasonable interpretation for the previous experiment reports and show a certain reference value to the upgrading of SLR system in the future.

关 键 词：卫星激光测距 探测成功率 斜程传输模型 气溶胶 透过率 

分 类 号：TN247[电子电信—物理电子学]