太阳高度角对大气偏振模式航向解算误差影响分析  

Course Calculating Error Impact Analysis with Different Solar Elevation Angle Based on Atmospheric Polarization Pattern

作　　者：李大林[1] 唐军[1] 刘丽双[1] 

机构地区：[1]中北大学电子测试技术重点实验室,太原030051

出　　处：《科学技术与工程》2016年第9期15-20,共6页Science Technology and Engineering

基　　金：国家重点基础研究发展计划(2012CB723404);国家杰出青年科学基金(51225504);国家自然科学基金培养项目;面上项目;青年基金(91123016;61171056;51105345;61503347);山西省高等学校优秀青年学术带头人支持计划资助

摘　　要：太阳子午线是大气偏振模式中重要的特征,可以将其作为导航的参考基准,从而获取其中所蕴含的重要导航信息;因此通过检测大气偏振模式中太阳子午线的位置,可以得到运动载体的二维航向信息。仿真实验结果表明,在不同太阳高度角时,太阳子午线的提取精度和航向解算精度都会受到影响。太阳高度角小于30°时,航向角误差维持在0.02°以内,在解算时可忽略;当太阳高度角在30°～60°时,航向角误差从0.02°开始缓慢增大为0.05°;当太阳高度角大于60°时,航向角误差急剧增大,最大可达0.1°以上;而当太阳高度角达到90°时,则完全不能进行航向测量。经过理论分析得出,当太阳高度角增大时,太阳子午线附近特征点分布区域会发散,在利用最小二乘法进行拟合时造成了误差。依据该分析可以在今后的航向解算时进行相应的误差补偿、优化算法以提高航向解算精度。The solar meridian is the significant feature of the atmospheric polarization pattern. It can be used as an important reference benchmark to obtain the important of navigation information. Therefore,by detecting the position of the solar meridian in the atmospheric polarization pattern,a two-dimensional heading information of moving object can be got. However,the simulation results show that at different angle of the sun,the extraction accuracy of sun＇s meridian and heading calculating precision will be affected. When the solar elevation angle is less than 30 °,heading angle error is maintained at less than 0. 02 °,which can be ignored; when the solar elevation angle changed from 30 ° to 60 °,heading error is increased slowly from 0. 02 ° to 0. 05 °; When the solar elevation angle greater than 60 °,heading angle error increases sharply,up to 0. 1 ° or more; and when the solar elevation angle reaches 90 °,heading measurement can not be done completely. Through theoretical analysising,the distribution of the feature points near the solar meridian would diverge as the solar elevation angle becoming large. So there will be some errors when fitting using least square method. And based on this analysis a appropriate error compensation during calculating the heading angle in the future can be made. And more optimization algorithm will be proposed to improve the calculating precision in the future.

关 键 词：大气光学 大气偏振模式 太阳高度角 航向解算误差 

分 类 号：P415.3[天文地球—大气科学及气象学]