A global grid model for the vertical correction of zenith wet delay based on the sliding window algorithm

被引：0
|
作者：
Huang L. [1 ,2 ]
Zhu G. [1 ,2 ]
Peng H. [1 ,2 ]
Chen H. [3 ]
Liu L. [1 ,2 ]
Jiang W. [4 ]
机构：
[1] College of Geomatics and Geoinformation, Guilin University of Technology, Guilin
[2] Guangxi Key Laboratory of Spatial Information and Geomatics, Guilin
[3] School of Geodesy and Geomatics, Wuhan University, Wuhan
[4] GNSS Research Center, Wuhan University, Wuhan
来源：
Cehui Xuebao/Acta Geodaetica et Cartographica Sinica | 2021年 / 50卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Sliding window algorithm; Tropospheric delay model; Vertical stratification; Zenith wet delay;
D O I：
10.11947/j.AGCS.2021.20200515
中图分类号：
学科分类号：
摘要：
Tropospheric delay is an important error source in Global Navigation Satellite System (GNSS) positioning. Some shortages still exist in current global zenith wet delay (ZWD) vertical stratification models, such as only single gridded data as well as monthly profiles is used for modeling. To address those of drawbacks, a new approach, the sliding window algorithm, is proposed to develop the ZWD vertical stratification model. In this work, the ZWD vertical stratification model that considering seasonal variations of ZWD height scale factor is developed, named as GZWD-H model. The ZWD layered profiles from 321 radiosonde sites in 2017 are treated as reference values, to evaluate the performance of GZWD-H model in layered vertical interpolation and its application in spatial interpolation for GGOS (global geodetic observing system) atmosphere gridded ZWD. Besides, the performance of GZWD-H model is compared to the GPT2w model. The results show that GZWD-H model shows the best performance in the ZWD layered vertical interpolation against the ZWD layered profiles from globally distributed radiosonde sites. In terms of RMS, the GZWD-H model has improved by 4% and 7% compared to the GPT2w-1 and GPT2w-5 models, respectively. Compared to GPT2w-1 and GPT2w-5 models, GZWD-H model has improved by 17% and 35% in spatial interpolation for GGOS Atmosphere gridded ZWD against surface ZWD calculated from radiosonde profiles over globe, respectively. In terms of model parameters, GZWD-H model has been significantly reduced and optimized against GPT2w-1 model, thus, the applicability of this model could be enhanced in GNSS atmospheric sounding and GNSS precise position. © 2021, Surveying and Mapping Press. All right reserved.
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页码：685 / 694
页数：9
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