基于格点化大气参数廓线模式的低仰角大气折射修正方法

Low Elevation Atmospheric Refraction Correction Method Based on Gridding Atmospheric Parameter Profile Mode

高精度低仰角大气折射修正方法是提高海陆域光电测控系统全方位测控能力的重要保证。利用光线追迹方法,建立了一种考虑大气空间不均匀性的低仰角大气折射修正方法;对修正方法的影响因素及误差进行了深入分析,包括大气空间不均匀性和湍流对低仰角大气折射修正的影响;给出了不同折射修正精度对应的大气折射率高度分布所要满足的最大误差,修正方法的数据基础为自主建立的基于实测廓线数据的三维空间格点化大气参数高度分布模式。利用建立的修正模型和格点化大气参数廓线模式对典型大气状况下的折射修正结果进行了分析。

High precision and low elevation atmospheric refraction correction method is an important assurance for improving omnibearing measurement ability of optic-electronic measuring and control system both in sea and land.According to the light tracing method,a low elevation atmospheric refraction correction method considering inhomogeneous of atmospheric space is proposed.The error and the effect factors of the correction method are analyzed thoroughly,including the effects of atmospheric space inhomogeneous and turbulence on low elevation atmospheric refraction correction,and the maximum error of atmospheric refractivity height distribution under different refraction correction precisions is provided.The data base of the correction method is the autonomously established three-dimensional space gridding atmospheric parameter height distribution mode based on measured profile data.The refraction correction results under typical atmospheric condition are analyzed by the proposed correction method and the gridding atmospheric parameter profile mode.