Assessment of ZTD Derived from COSMIC Occultation Data with ECWMF, Radiosondes, and GNSS.

Assessment of ZTD Derived from COSMIC Occultation Data with ECWMF, Radiosondes, and GNSS.
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使用 ECWMF、无线电探空仪和 GNSS 评估从 COSMIC 掩星数据得出的 ZTD

DOI:
10.3390/s22145209
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发表时间:
2022-07-12
期刊:
Sensors (Basel, Switzerland)
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全球导航卫星系统(GNSS)信号在通过大气时会产生倾斜的对流层延迟,这是许多空间大地测量应用中公认的主要误差来源。射电掩星数据得到的天顶对流层延迟(ZTD)对大气研究和气象学具有重要意义,需要在精确定位中进行评估。基于星座气象、电离层和气候观测系统(COSMIC)数据分析与存档中心(CDAAC) 2008年1月1日至2012年12月31日的atmPrf、sonPrf和echPrf数据,我们得到了掩星数据(occZTD)和相应的探空数据(sonZTD)和ECWMF数据(echZTD)的ztd。利用气压高度公式(gnsZTD)对国际GNSS服务(IGS)地面全球定位系统(GPS)观测得到的ztd进行校正,得到匹配射电掩星剖面的最低切点高度。统计结果表明,occZTD与echZTD、sonZTD、gnsZTD之间的偏差绝对值小于5 mm,标准差约为20 mm或更小,说明在使用Abel反演算法获取atmPrf折射率剖面时,即使引入局部球对称假设误差,occZTD在GNSS定位模型中仍具有显著的精度。分析了水平/垂直匹配分辨率和站高/纬度变化对occZTD和gnsZTD偏差的影响。研究结果可用于量化掩星数据在动态高精度定位对流层延迟误差校正中的性能。
Global Navigation Satellite System (GNSS) signals generate slant tropospheric delays when they pass through the atmosphere, which is recognized as the main source of error in many spatial geodetic applications. The zenith tropospheric delay (ZTD) derived from radio occultation data is of great significance to atmospheric research and meteorology and needs to be assessed in the use of precision positioning. Based on the atmPrf, sonPrf, and echPrf data from the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) Data Analysis and Archiving Center (CDAAC) from 1 January to 31 December 2008 and 2012, we obtained the ZTDs of the radio occultation data (occZTD) and the corresponding radiosonde (sonZTD) and ECWMF data (echZTD). The ZTDs derived from ground-based global positioning system (GPS) observations from the International GNSS Service (IGS) were corrected to the lowest tangent point height of the matched radio occultation profile by the barometric height formula (gnsZTD). The statistical results show that the absolute values of the bias between occZTD and echZTD, sonZTD, or gnsZTD are less than 5 mm, and the standard deviations are approximately 20 mm or less, indicating that occZTD had significant accuracy in the GNSS positioning model even when the local spherical symmetry assumption error was introduced when the Abel inversion algorithm was used to obtain the refractive index profile of atmPrf. The effects of the horizontal/vertical matching resolution and the variation in the station height/latitude on the biases of occZTD and gnsZTD were analyzed. The results can be used to quantify the performance of radio occultation data for tropospheric delay error correction in dynamic high-precision positioning.
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