Assessment and reduction of zenith path delay biases due to day boundary effect

IF 2.4 Q2 GEOSCIENCES, MULTIDISCIPLINARY VIETNAM JOURNAL OF EARTH SCIENCES Pub Date : 2021-09-30 DOI:10.15625/2615-9783/16587
Lau Nguyen Ngoc, R. Coleman
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引用次数: 1

Abstract

The troposphere consists of dry air and water vapor, delaying the GNSS signal by about 2.4 m in the zenith direction. The water vapor only causes an error of about 0.2 m in distance measurement, but it is challenging to model and overcome. From 2003 the International GNSS Service (IGS) started to provide the new product of zenith path delay (ZPD) with an accuracy of 1.5-5 mm. However, we found an error in these products up to 30 mm at epochs between 2 days due to the day boundary effect and an average of 16mm RMS for nine days. Our research shows that for reducing the impact, the most critical factor is selecting the initial value for the ZPD, followed by satellite orbit/clock and, finally, the station coordinate values. By choosing an appropriate initial value for ZPD and employing a 3 days orbit/clock, the ZPD error due to the day boundary effect can be reduced to negligible. Meanwhile, the change in the station coordinate value in cm level does not impact the effect.
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天边界效应引起的天顶路径延迟偏差的评估和减少
对流层由干燥空气和水蒸气组成,使GNSS信号在天顶方向延迟约2.4米。在距离测量中,水蒸气只会造成约0.2 m的误差,但建模和克服这一误差具有挑战性。从2003年开始,国际GNSS服务(IGS)开始提供精度为1.5- 5mm的天顶路径延迟(ZPD)新产品。然而,由于日边界效应,我们发现这些产品在2天之间的epoch误差高达30毫米,9天的平均RMS为16毫米。研究表明,为了减小影响,最关键的因素是选择ZPD的初始值,其次是卫星轨道/时钟,最后是站座标值。通过选择合适的ZPD初始值和采用3天轨道/时钟,由于日边界效应引起的ZPD误差可以降低到可以忽略不计。同时,cm级站位坐标值的变化不影响效果。
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来源期刊
VIETNAM JOURNAL OF EARTH SCIENCES
VIETNAM JOURNAL OF EARTH SCIENCES GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
20.00%
发文量
0
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