Availability analysis for ionospheric gird model in China areas under multi-GNSS observations
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摘要: 多系统全球卫星导航系统(GNSS)的出现为天基增强系统(SBAS)电离层格网模型的性能提升提供了可能，但多系统GNSS测量对电离层格网模型性能提升是有条件的. 为此，利用中国区域GPS观测模拟分析了多系统GNSS测量对中国区域电离层格网模型可用性的影响. 结果表明：多系统GNSS测量可有效提高电离层格网模型的覆盖范围. 中国南方地区存在低纬赤道电离异常(EIA)现象，严重影响SBAS电离层格网模型实现性能，单纯增加GNSS测量不能有效应对低纬电离异常现象影响. 中国北方地区电离层延迟变化平缓，在多系统GNSS测量情况下可以考虑减少地面监测站数量，仍能保持系统原有性能.
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关键词:
- 电离层 /
- 赤道电离异常 /
- 天基增强系统(SBAS) /
- 格网模型
Abstract: While multi-Global Navigation Satellite System (GNSS) observation make it possible for a better performance of ionospheric model for Space Based Augmentation System (SBAS), the potential improvement depends on various factors. The paper analyzes the availability of ionospheric grid model for SBAS covering China and around areas under multi-GNSS scenarios. The results show that the covering area of grid model could be extended with multi-GNSS measurements. But for southern China, where equatorial ionolization anomaly (EIA) exists, the performance improves marginally as the increased observations cannot counter effectively the EIA’s serious impacts on grid model. In northern China, the ionosphere varies smoothly and multi-GNSS observations are helpful to reduce the number of sites while maintains the system performance. -
图 2 单系统GNSS观测下中国区域电离层格网模型覆盖范围及格网点可用性结果
注：图(a)中电离层格网点满足95%可用性，图(b)中电离层格网点满足100%可用性. 红色格网点表明可满足相应的可用性指标(95%或100%)，绿色格网点表明不能满足相应的可用性指标.
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[1] 郭树人, 刘成, 高为广, 等. 卫星导航增强系统建设与发展[J]. 全球定位系统, 2019, 44(2): 1-12. [2] CHAO YC. Real time implementation of the wide area augmentation system for the Global Positioning System with an emphasis on ionospheric modeling[D]. Department of Aeronautics and Astronautics: Stanford University, 1997. [3] BLANCH J. Using Kriging to bound satellite ranging errors due to the ionosphere[D]. Department of Aeronautics and Astronautics: Stanford University, 2003. [4] SPARKS L, BLANCH J, PANDYA N. Estimating ionospheric delay using kriging: 2. Impact on satellite-based augmentation system availability[J]. Radio science, 2011, 46(6): RS0D22. DOI: 10.1029/2011RS004781 [5] LIU D, FENG J, CHEN L, et al. A study on construction of ionospheric spatial threat model over China area[C]// China Satellite Navigation Conference, 2017: 195-208. DOI: 10.1007/978-981-10-4591-2_16 [6] SPARKS L, BLANCH J, PANDYA N. Estimating ionospheric delay using kriging: 1. Methodology[J]. Radio science, 2011, 46(6): RS0D21. DOI: 10.1029/2011RS004667 [7] 熊年禄, 唐存琛, 李行健. 电离层物理概论[M]. 武汉: 武汉大学出版社, 1999. [8] 刘钝, 甄卫民. 中国区域电离层特性对卫星导航系统的影响[J]. 电波科学学报, 2012, 27(1): 95-101. [9] 刘钝, 於晓, 陈丽, 等. 赤道电离异常对电离层网格模型实现的影响[C]//中国卫星导航年会(CSNC) , 北京, 2020. [10] LIU D, YU X, CHEN L, et al. Analysis of ionospheric grid model performance for China area [C]//China Satellite Navigation Conference (CSNC), 2020: 598-610. DOI: 10.1007/978-981-15-3711-0_53 -
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