A study on performance of ionospheric grid information of BDS
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摘要: 电离层延迟是造成卫星导航系统误差的重要来源之一,因此，电离层延迟的修正精度直接影响用户定位精度．随着北斗卫星导航系统（BDS）全面服务亚太地区,用户对BDS高精度定位导航服务的需求日益迫切．同时BDS将基本导航服务和广域差分服务进行了一体化设计,为用户发布了高更新频率的格网点电离层信息,有效提升了用户的定位精度．本文利用2017年1月—2018年10月的数据对BDS格网点电离层信息的服务范围和服务精度进行评估,结果表明:格网点电离层信息有效覆盖区域基本覆盖中国区域,修正偏差约1.62 TECU,修正率约为86.7％;格网点电离层信息修正精度具有季节变化,冬季修正精度较低且波动较大,修正率约为82％,其他季节修正率均优于87％;修正偏差、修正率白天均高于夜间;格网点电离层信息具有较强的抗拢动能力．Abstract: Ionospheric delay is one of the main error sources in satellite navigation system, whose correction accuracy directly affects the users’ positioning accuracy. With the BDS navigation satellite system (BDS) fully serving the Asia-Pacific region,there is an increasingly urgent need for BDS to provide users with highprecision positioning and navigation services. At same time, BDS integrates the basic navigation service and Wide Area Difference Service (WADS), releases ionospheric grid information with high update frequency , which can effectively improve the positioning performance. This paper evaluates the service range and service performance of ionospheric grid information service of BDS using data from January 2017 to October 2018. The results indicate that the effective coverage area of ionospheric grid information basically covers China, with a correction deviation of 1.62 TECU and a correction rate of 86.7%. The correction accuracy of ionospheric grid information is lower and more fluctuating in winter with a correction rate of 82%, but higer 87% in other seasons. Both the correction deviation and correction rate are higer during the day than at night. In addition, ionospheric grid information shows strong ability to resist disturbance.
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Key words:
- BDS /
- ionospheric grid information /
- performance evaluation /
- service precision /
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