高精度折光修正系统射线描迹快速算法  

High-precision fast ray-tracing algorithm used in optical wave refraction error correction system

作　　者：刘玉梅[1] 陈祥明[1] 赵振维[1] 孙方[1] 

机构地区：[1]中国电波传播研究所,山东青岛266107

出　　处：《电波科学学报》2015年第4期749-753,共5页Chinese Journal of Radio Science

基　　金：国家自然科学基金(No.41305024;No.41205024)

摘　　要：大气折射误差是影响外弹道测量数据的主要误差源之一.受技术条件所限,大气折射误差修正在线算法常采用简化模型,而高精度的大气折射误差修正往往置于事后数据处理工作中.为适应新形势下折光修正系统数据处理的需求,基于大气折射率随高度的分布特征,引入"虚高"概念,并给出了高度迭代步长选取的新方法.通过与传统方法的比较可知:改进方法在保证大气折射误差修正精度的同时,大大提高了射线描迹算法的运算速度;另外,该仿真结果也可为电波大气折射误差修正的工程应用提供参考.The atmospheric refraction error is a main error source among the factors affecting the flight data processing of trajectory measurement.With the restriction of technical condition,the on-line atmospheric refraction correction always uses simplified model.Usually,the high-precision atmospheric refraction correction depends on the post-data processing due to its lower real-time capability.In order to adapt the higherprecision requirements of data processing in optical wave refraction error correction system,virtual height is used and height iteration step is amended according to the distribution change of atmosphere with altitude.The comparison with the general method shows that the improved method has the same accuracy,but the speed of the ray-tracing algorithm is greatly improved.Besides,the simulation may provide valuable reference for the projects of radio wave atmospheric refraction correction.

关 键 词：折光修正 射线描迹 简化模型 虚高 迭代步长 

分 类 号：TN011[电子电信—物理电子学]