摘要
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.
In a laser target positioning system, to correct the location error is essential for improving the measurement precision. In this paper, a novel method of correcting the tropospheric target location error in utilizing pure rotation lidar is presented. The vertical profiles of atmospheric refractive index are deduced by the pure rotation return signals of N2 and O2, which are detected by the pure Raman lidar. Then, the refraction angle and elevation orientation errors at different altitude are corrected based on error correcting theory. The results indicate that the target location error are well corrected by making use of the atmospheric refractive index which is detected by pure rotation lidar. At the same altitude, the target refraction angle and elevation orientation errors decrease as the visual angle increases. When the visual angle is 10~, the refraction angle of the target at 8 km reaches 3.15＇ and the elevation orientation error is 14.55 m. When it is 300167, the refraction angle of the target at the same altitude is only 0.98＇ and the elevation orientation error is 1.19 m.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2009年第7期5091-5097,共7页
Acta Physica Sinica
基金
科技部科技基础性工作专项基金(2007FY110700)资助的课题~~
关键词
激光雷达
定位误差
大气折射指数
大气温度
lidar, location error, atmosphere refractivity, atmosphere temperature
