Acta Geodaetica et Cartographica Sinica ›› 2019, Vol. 48 ›› Issue (3): 276-285.doi: 10.11947/j.AGCS.2019.20180160

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Applicability of Bevis formula at different height level and global weighted mean temperature model based on near-earth atmospheric temperature

YAO Yibin, SUN Zhangyu, XU Chaoqian   

  1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
  • Received:2018-04-08 Revised:2018-11-06 Online:2019-03-20 Published:2019-04-10
  • Supported by:

    The National Natural Science Foundation of China (No. 41574028)

Abstract:

Weighted mean temperature is a critical parameter in GNSS technology to retrieve precipitable water vapor (PWV). It is convenient to obtain high-accuracy Tm estimation near surface utilizing Bevis formula and surface temperature. However, some researches pointed out that the Bevis formula has large uncertainties in high-altitude regions. This paper researches the applicability of Bevis formula at different height levels and finds that the Bevis formula has relatively high precision when the altitude is low, while with altitude increasing, the precision decreases gradually. To solve the problem, this paper studies the relationship between Tm and atmospheric temperature of the near-earth space range (the height range between 0~10 km) and finds that they have high correlation on a global scale. Accordingly, this paper builds a global weighted mean temperature model based on near-earth atmospheric temperature. Validation results of the model show that this model can provide high-accuracy Tm estimation at any height level in the near-earth space range.

Key words: weighted mean temperature, Bevis formula, near-earth atmospheric temperature, global model

CLC Number: