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提出了一种利用纯转动拉曼激光雷达修正对流层目标定位误差的方法,其基本思想是通过接收氮气和氧气的纯转动拉曼回波信号反演大气折射率垂直廓线,根据目标定位误差理论修正不同高度处目标物的总折射角和高度定位修正值.结果表明:通过纯转动拉曼激光雷达反演大气折射率廓线,可较好修正目标定位误差.计算定位误差时得出相同高度处目标物的总折射角和高度定位修正值随视仰角的增加而减小.当视仰角为10°时,位于8 km高度处的目标物总偏折角可达3.15′,高度定位修正值为14.55 m.当视仰角为30°时,相同高度处目标物总偏折角仅为0.98′,高度定位修正值为1.19 m.
A method to correct tropospheric target localization error using purely rotating Raman lidar is proposed. The basic idea is to invert the vertical profile of atmospheric refractive index by receiving purely rotating Raman echo signals of nitrogen and oxygen. According to the theory of target localization error The correction of the total refraction angle and the height positioning correction value of the target at different heights.The results show that the target positioning error can be corrected well by the purely rotating Raman lidar inversion of the atmospheric refractive index profile.The same height When the apparent elevation is 10 °, the total deflection angle of target at 8 km height is up to 3.15 ’, and the correction value of height orientation is 14.55 m. When the apparent elevation is 30 °, the total deflection angle of the target at the same height is only 0.98 ’, and the height correction is 1.19 m.