摘要
北斗星基增强系统(BeiDou Satellite-Based Augmentation System,BDSBAS)通过境内的监测站为中国及周边地区用户提供电离层改正及电离层完好性监测服务,因此其对电离层算法的可用性要求较高.本文采用附加Kriging估计的调整球谐函数建模方法(adjusted spherical harmonics adding Kriging,SHAKING)解算BDSBAS电离层参数信息.通过对现有星基增强系统(Satellite-Based Augmentation System,SBAS)电离层的性能分析可以发现,部分SBAS播发了标记为未监测点的延迟修正信息.通过对中国区域SBAS格网点需求分析可以发现:在卫星截止高度角为15°时,SHAKING方法提供的电离层可用点为189个、不可用点为3个,满足服务需求;结合BDSBAS提供的钟轨改正信息,SHAKING方法较反距离加权插值(inverse distance weighted,IDW)方法的垂直制导进近可用性范围提高约30%.
The BeiDou Satellite-Based Augmentation System(BDSBAS)provides ionospheric correction and integrity monitoring services for users in China and surrounding regions through domestic monitoring stations.Therefore,it demands high availability of ionospheric algorithms.This paper utilizes the adjusted spherical harmonics adding Kriging(SHAKING)method to calculate ionospheric parameter information for BDSBAS.Performance analysis of existing Satellite-Based Augmentation System(SBAS)ionospheric models reveals that some SBAS systems broadcast delay correction information marked as unmonitored points.Demand analysis of regional SBAS grid points in China shows that when the satellite elevation angle is set as 15°,SHAKING provides 189 usable points and 3 unusable points.Combined with clock and orbit correction information provided by BDSBAS,SHAKING improves the availability range of approaches with vertical guidance by approximately 30%compared to the inverse distance weighting(IDW)method.
作者
刘昂
李子申
王宁波
张周宇
汪亮
邵搏
LIU Ang;LI Zishen;WANG Ningbo;ZHANG Zhouyu;WANG Liang;SHAO Bo(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;University of Chinese Academy of Sciences,Beijing 100049,China;The 20th Research Institute of CETC,Xi’an 710068,China)
出处
《全球定位系统》
CSCD
2024年第5期10-18,119,共10页
Gnss World of China
基金
国家自然科学基金(42122026,42074043,42174038,42404013)
北京市科技新星计划(20230484329)。
