Results 181 to 190 of about 3,196 (215)

Improved Mapping of Tropospheric Delays

Journal of Atmospheric and Oceanic Technology, 2001
Abstract The authors compare several methods to map the a priori tropospheric delay of global positioning system (GPS) signals from the zenith direction to lower elevations. This is commonly achieved with so-called mapping functions. Dry mapping functions are applied to the hydrostatic delay; wet mapping functions are used to map the zenith wet delay ...
Christian Rocken, Sergey Sokolovskiy, James M. Johnson, Doug Hunt   +3 more
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Strategies for estimating tropospheric delays with GPS

2002 IEEE Position Location and Navigation Symposium (IEEE Cat. No.02CH37284), 2003
Until recently, the tropospheric zenith delay (TZD) was considered a nuisance parameter of the GPS observation model. However, as the requirements of the weather forecasting community have become better understood, the possible use of TZDs in weather forecasting has been recognized.
P. Collins, Y. Mireault, P. Heroux
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Tropospheric delay models for GNSS in Indonesia

2021
Tropospheric delay is one of the major error sources in space geodetic observations, including GNSS. It is important to treat these delays accordingly to improve the accuracy of the observations. The tropospheric delay models VMF1 and GMF are widely used in GNSS data analysis. Recently, a new and refined version of VMF1, VMF3 was released.
openaire   +1 more source

An analysis of multisource tropospheric hydrostatic delays and their implications for GPS/GLONASS PPP-based zenith tropospheric delay and height estimations

Journal of Geodesy, 2021
To obtain better zenith hydrostatic delay (ZHD) corrections for global navigation satellite system (GNSS) applications, seven types of Vienna mapping function 1 (VMF1) and VMF3-like ZHD models provided by the Vienna University of Technology (TU Wien, TUW), University of New Brunswick (UNB) and GeoForschungsZentrum Potsdam (GFZ) are evaluated.
Hongxing Zhang, Yunbin Yuan, Wei Li
openaire   +1 more source

Robust Modeling of Tropospheric Delay Dynamics for Sequential Positioning

2020 IEEE/ION Position, Location and Navigation Symposium (PLANS), 2020
In this paper, we develop robust stochastic models of tropospheric delay accounting for uncertainty in residual tropospheric error time-correlation. This work is intended for time-sequential positioning and fault detection algorithms including, for example, integrated inertial navigation systems and dual-frequency, multi-constellation Advanced Receiver
Elisa Gallon, Mathieu Joerger, Boris Pervan   +2 more
openaire   +1 more source

Modelling of tropospheric delays in geosynchronous synthetic aperture radar

Science China Information Sciences, 2017
As a direct consequence of the orbital height, the integration time in geosynchronous synthetic aperture radar (GEO SAR) with metric or decimetric azimuth resolutions is in the order of several hundreds or even thousands of seconds. With such long integration time, the compensation of residual tropospheric propagation terms poses one of the fundamental
Li, Dexin, Rodriguez-Cassola, Marc, Prats, Pau, Dong, Zhen, Wu, Manqing, Moreira, Alberto   +5 more
openaire   +2 more sources

Comparison of retrieval algorithms for the wet tropospheric path delay

2014 13th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad), 2014
This paper provides a comparative analysis of statistical algorithms for the retrieval of the wet tropospheric correction from microwave radiometers in the context of altimetry missions. The algorithms are based on the algorithms used in Envisat and Jason-1 missions.
Thao, Soulivanh, Obligis, Estelle, Picard, Bruno, Frery, Marie-Laure, Eymard, Laurence   +4 more
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Refined Tropospheric Delay Models for CONT11

2015
For the period of CONT11, a continuous VLBI campaign which lasted from September 15 through September 29, 2011, new a coefficients for the Vienna Mapping Functions 1 (VMF1; Bohm et al., J Geophys Res 111:B02406, 2006) and an extended calculation strategy for horizontal gradients were applied.
D. Landskron, A. Hofmeister, J. Böhm
openaire   +1 more source

Comparison of Ray-Tracing Packages for Troposphere Delays

IEEE Transactions on Geoscience and Remote Sensing, 2012
A comparison campaign to evaluate and compare troposphere delays from different ray-tracing software was carried out under the umbrella of the International Association of Geodesy Working Group 4.3.3 in the first half of 2010 with five institutions participating: the GFZ German Research Centre for Geosciences (GFZ), the Groupe de Recherche de Geodesie ...
Vahab Nafisi, Landon Urquhart, Marcelo C. Santos, Felipe G. Nievinski, Johannes Böhm, Dudy D. Wijaya, Harald Schuh, Alireza Azmoudeh Ardalan, Thomas Hobiger, Ryuichi Ichikawa, Florian Zus, Jens Wickert, Pascal Gegout   +12 more
openaire   +3 more sources

Evaluation of Different Tropospheric Delay Models

2008
Tropospheric delay can be a signifi cant source of error in satellite-based positioning systems. Two basic types of delay prediction models exist, the first using surface meteorological parameters to estimate the magnitude of the tropospheric delay, and the other global models using average and seasonal variation data.
Kos, Tomislav, Markežić, Ivan, Botinčan, Maja   +2 more
openaire   +2 more sources