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An Evaluation of Spire Radio Occultation Data in Assimilative Ionospheric Model GPSII and Validation by Ionosonde Measurements
Radio Science ( IF 1.6 ) Pub Date : 2021-04-12 , DOI: 10.1029/2020rs007139
Kelsey K. Kramer 1 , Sergey V. Fridman 1 , L. J. Nickisch 1
Affiliation  

This paper presents a comprehensive analysis of results obtained using NWRA’s assimilative ionospheric model GPSII when it is driven by Spire Global, Inc.’s global navigation satellite system ‐ radio occultation (GNSS‐RO) measurements. Results of the assimilative model are validated using the database of Digisonde and Dynasonde ionograms. A week’s worth of dual‐frequency phase data was collected from Spire’s constellation of low‐Earth orbiting micro‐satellites carrying GNSS receivers and assimilated into GPSII. A validation study of GNSS‐RO measurements was performed in four geographical regions. GPSII operation with the data was evaluated and the results were validated against independent ionospheric measurements. Ground‐based ionosondes were employed in diagnosing the accuracy of the derived models; we studied the differences between the F2 peak parameters (the F2 layer critical frequency, urn:x-wiley:00486604:media:rds21008:rds21008-math-0001, and the peak height of the F2 layer, urn:x-wiley:00486604:media:rds21008:rds21008-math-0002) derived from ionograms and those computed with GPSII. For the 1,491 validation events used in this study, the magnitude of the deviation of the GPSII‐predicted urn:x-wiley:00486604:media:rds21008:rds21008-math-0003 at an ionosonde location from the corresponding ionosonde‐observed value was found on average to be 0.608 MHz (with a median of 0.461 MHz) and the magnitude of the deviation of the GPSII‐predicted urn:x-wiley:00486604:media:rds21008:rds21008-math-0004at an ionosonde location from the corresponding ionosonde‐observed value was found to be on average 22.9 km (with a median value of 18.0 km). Median GPSII validation errors for urn:x-wiley:00486604:media:rds21008:rds21008-math-0005 are a factor of four smaller than corresponding errors for IRI, while GPSII urn:x-wiley:00486604:media:rds21008:rds21008-math-0006 errors are a factors of two smaller than those for IRI. The analysis showed that Spire’s TEC data was both compatible for ingestion into GPSII and that the assimilation of the data improved the comparison to ground‐based ionosondes.

中文翻译:

相似电离层GPSGPS模型中尖锐无线电掩星数据的评估和离子探空仪测量的验证

本文对NWRA的同化电离层模型GPSII由Spire Global,Inc.的全球导航卫星系统-无线电掩星(GNSS-RO)测量驱动时获得的结果进行了全面分析。使用Digisonde和Dynasonde离子图数据库验证同化模型的结果。从斯皮尔(Spire)携带GNSS接收器的低地球轨道微卫星星座中收集了一周的双频相位数据,并将其吸收到GPSII中。在四个地理区域进行了GNSS-RO测量的验证研究。利用数据评估了GPSII的运行情况,并针对独立的电离层测量结果对结果进行了验证。基于地面的离子探空仪被用于诊断衍生模型的准确性。缸:x-wiley:00486604:media:rds21008:rds21008-math-0001,以及F2层的峰高,缸:x-wiley:00486604:media:rds21008:rds21008-math-0002),由电离图和GPSII计算得出。对于本研究中使用的1,491个验证事件,骨灰盒:x-wiley:00486604:media:rds21008:rds21008-math-0003发现在离子探空仪位置预测的GPSII与相应的离子探空仪观测值的偏差的大小平均为0.608 MHz(中值为0.461 MHz),并且该大小发现在离子探空缸:x-wiley:00486604:media:rds21008:rds21008-math-0004仪位置预测的GPSII与相应的离子探空仪观测值的偏差平均为22.9 km(中值为18.0 km)。GPSII验证错误的中位数骨灰盒:x-wiley:00486604:media:rds21008:rds21008-math-0005比IRI的相应错误小四倍,而GPSII骨灰盒:x-wiley:00486604:media:rds21008:rds21008-math-0006误差是IRI的两倍。分析表明,Spire的TEC数据可兼容GPSII,并且数据的同化可改善与地面离子探空仪的比较。
更新日期:2021-04-22
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