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在外场用已知半球反射率的靶板作为标准靶板,反演测定目标靶板激光雷达散射截面和半球反射率。由于受到随机变化的大气衰减和激光器输出能量等因素的影响,靶板角分布曲线与朗伯余弦曲线会有一定偏差,因此,采用双光路测量法来确定各个测量时刻的大气衰减系数和激光器输出能量,然后,再与半球反射率已知的标准靶板比较,计算得到目标靶板的激光雷达散射截面。实验测得的目标靶板反射率为24.9%,与实际标定值25.3%的相对误差为1.6%,满足10%的外场精度要求。通过实验测量的结果分析表明利用双光路方法对目标靶板与标准靶板进行测量,较好地消除了各个时刻的大气衰减和激光器照射能量对测量结果的影响。
In the field with the known hemisphere reflectivity of the target as a standard target plate, the target inversion lidar scattering cross section and the hemispherical reflectivity. Due to the random variation of atmospheric attenuation and laser output energy and other factors, there is a certain deviation between the angular distribution curve of the target plate and the Lambertian cosine curve. Therefore, the dual optical path measurement method is used to determine the atmospheric attenuation coefficient and laser output at each measurement time Energy, and then, compared with the standard hemisphere reflectivity target has been compared to calculate the target target of the laser radar cross section. The measured target target reflectance was 24.9%. The relative error from the actual calibrated value of 25.3% was 1.6%, meeting the requirement of 10% field precision. The results of the experimental measurements show that using the dual optical path method to measure the target plate and the standard target plate can well eliminate the influence of atmospheric attenuation and laser irradiation energy on the measurement results at each moment.