不同活跃状态下香港区域电离层建模分析  

Analysis of ionospheric modeling in the Hong Kong region under different active states

作　　者：赵奕源 吴文坛 赵春梅[1,2] 秘金钟 莫雁寒[3] 田时雨 李得海 ZHAO Yiyuan;WU Wentan;ZHAO Chunmei;BEI Jinzhong;MO Yanhan;TIAN Shiyu;LI Dehai(Chinese Academy of Surveying and Mapping,Beijing 100036,China;Beijing Fangshan Satellite Laser Ranging National Observation and Research Station,Beijing 102406,China;Hebei Natural Resources Archives,Shijiazhuang 071299,China;Hebei Second Institute of Surveying and Mapping,Shijiazhuang 071299,China)

机构地区：[1]中国测绘科学研究院,北京100036 [2]北京房山人卫激光国家野外科学观测研究站,北京102406 [3]河北省自然资源档案馆,石家庄071299 [4]河北省第二测绘院,石家庄071299

出　　处：《测绘科学》2023年第8期72-80,共9页Science of Surveying and Mapping

基　　金：国家重点研发计划课题项目(2021YFB3900803);基本科研业务费项目(AR2102);河北省自然资源厅科技项目(13000023P00EEC410189U,13000022P00EEC410090F);河北省技术创新引导计划项目科技冬奥专项(21477603D)。

摘　　要：针对如何选取合适的区域电离层模型阶数的问题,该文研究了不同活跃状态下中国香港区域电离层模型的精度,提供了电离层平静期、活跃期、异常期区域电离层球谐函数建模的最佳阶数。利用低纬度中国香港CORS网数据,建立区域电离层模型,通过对比欧洲定轨中心(CODE)电离层产品验证了区域电离层模型最佳阶数的建模精度。在约110km区域范围内,研究结果表明:①电离层平静期,1~5阶球谐模型垂直电子总含量(VTEC)建模效果相当,相对于CODE产品VTEC偏差的均值为2.286~3.300TECU;②电离层活跃期和异常期,2阶模型VTEC建模精度最高,相对于CODE产品VTEC偏差的均值分别为4.121、4.546TECU;③随着球谐模型阶数增加,2阶以上球谐模型电离层拟合精度无显著提升;④随着电离层活跃更加剧烈,球谐模型拟合残差逐渐增大,拟合效果和建模精度出现下降。In view of the problems that how to select the appropriate order of the regional ionospheric model,the accuracy of the Hong Kong regional ionospheric model under different active states was studied in this paper,and the best order of the regional ionospheric spherical harmonic function modeling in the calm,active and abnormal periods of the ionosphere was provided.Using the data of CORS network in Hong Kong at middle and low latitudes,a regional ionospheric model was established.The modeling accuracy of the best order of the regional ionospheric model was verified by comparing the CODE ionospheric products.In the area of about llo km,the research results showed that:During the ionospheric quiet period,the modeling accuracy of the 1~5 order spherical harmonic model VTEC was equivalent,and the mean values of the VTEC deviation relative to the CODE product were 2.286~3.300 TECU;@During the active and abnormal periods of the ionosphere,the second order model VTEC had the highest modeling accuracy,and the mean values of the deviation from the CODE product VTEC were 4.121and4.546TECUrespectively;③As the order of the spherical harmonic model increased,the ionospheric fitting accuracy of the spherical harmonic model above the second order was not significantly improved;@As the ionosphere became more active,the fitting residual of spherical harmonic model gradually increased,and the fitting effect and modeling accuracy decreased.

关 键 词：电离层 区域电离层模型 球谐函数 电离层异常 

分 类 号：P228.4[天文地球—大地测量学与测量工程]