Monitoring Zenithal Total Delays over the three different climatic zones from IGS GPS fina

Monitoring Zenithal Total Delays over the three different climatic zones from IGS GPS final products: A comparison between the use of the

VMF1 and GMF mapping functions

Benachour Labib;Jianguo Yan;Jean-Pierre Barriot;Fangzhao Zhang;Peng Feng

【期刊名称】《大地测量与地球动力学（英文版）》 【年(卷),期】2019(010)002

【摘要】The International GNSS Service (IGS) final products (ephemeris and clocks-correction) have made the GNSS an indispensable low-cost tool for scientific research, for example sub-daily atmospheric water vapor monitoring. In this study, we investigate if there is a systematic difference coming from the choice between the Vienna Mapping Function 1 (VMF1) and the Global Mapping Function (GMF) for the modeling of Zenith Total Delay (ZTD) estimates, as well as the Integrated Precipitable Water Vapor (IPWV) estimates that are deduced from them. As ZTD estimates cannot be fully separated from coor-dinate estimates, we also investigated the coordinate repeatability between subsequent measurements. For this purpose, we monitored twelve GNSS stations on a global scale, for each of the three climatic zones (polar, mid-latitudes and tropical), with four stations on each zone. We used an automated pro-cessing based on the Bernese GNSS Software Version 5.2 by applying the Precise Point Positioning (PPP)