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Main Title: The Impact of Estimating High-Resolution Tropospheric Gradients on Multi-GNSS Precise Positioning
Author(s): Zhou, Feng
Li, Xingxing
Li, Weiwei
Chen, Wen
Dong, Danan
Wickert, Jens
Schuh, Harald
Type: Article
Language Code: en
Abstract: Benefits from the modernized US Global Positioning System (GPS), the revitalized Russian GLObal NAvigation Satellite System (GLONASS), and the newly-developed Chinese BeiDou Navigation Satellite System (BDS) and European Galileo, multi-constellation Global Navigation Satellite System (GNSS) has emerged as a powerful tool not only in positioning, navigation, and timing (PNT), but also in remote sensing of the atmosphere and ionosphere. Both precise positioning and the derivation of atmospheric parameters can benefit from multi-GNSS observations. In this contribution, extensive evaluations are conducted with multi-GNSS datasets collected from 134 globally-distributed ground stations of the International GNSS Service (IGS) Multi-GNSS Experiment (MGEX) network in July 2016. The datasets are processed in six different constellation combinations, i.e., GPS-, GLONASS-, BDS-only, GPS + GLONASS, GPS + BDS, and GPS + GLONASS + BDS + Galileo precise point positioning (PPP). Tropospheric gradients are estimated with eight different temporal resolutions, from 1 h to 24 h, to investigate the impact of estimating high-resolution gradients on position estimates. The standard deviation (STD) is used as an indicator of positioning repeatability. The results show that estimating tropospheric gradients with high temporal resolution can achieve better positioning performance than the traditional strategy in which tropospheric gradients are estimated on a daily basis. Moreover, the impact of estimating tropospheric gradients with different temporal resolutions at various elevation cutoff angles (from 3° to 20°) is investigated. It can be observed that with increasing elevation cutoff angles, the improvement in positioning repeatability is decreased.
Issue Date: 3-Apr-2017
Date Available: 7-Aug-2019
DDC Class: 550 Geowissenschaften
Subject(s): GNSS
tropospheric gradients
precise point positioning
temporal resolution
elevation cutoff angle
Journal Title: Sensors
Publisher: MDPI
Publisher Place: Basel
Volume: 17
Issue: 4
Article Number: 756
Publisher DOI: 10.3390/s17040756
EISSN: 1424-8220
Appears in Collections:FG GNSS-Fernerkundung, Navigation und Positionierung » Publications

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