Results 131 to 140 of about 1,078 (176)

Robust Modeling of GNSS Tropospheric Delay Dynamics

IEEE Transactions on Aerospace and Electronic Systems, 2021
In this article, we develop new stochastic tropospheric error models for positioning, fault detection, and integrity monitoring over time. We first perform time-domain and frequency-domain analyses of residual tropospheric delays observed over 12 months at multiple globally distributed locations. We then derive bounding error models for time-sequential
Elisa Gallon, Mathieu Joerger, Boris Pervan   +2 more
openaire   +1 more source

Computation of Troposphere Slant Delays on a GPU

IEEE Transactions on Geoscience and Remote Sensing, 2009
The computation of ray-traced troposphere delays which can be utilized for space geodetic applications is a time-consuming effort when a large number of rays has to be calculated. On the other hand, computation time can be tremendously reduced when algorithms are capable of supporting parallel processing architectures.
Thomas Hobiger, Ryuichi Ichikawa, Yasuhiro Koyama, Tetsuro Kondo   +3 more
openaire   +2 more sources

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
openaire   +1 more source

Ray‐traced tropospheric delays in VLBI analysis

Radio Science, 2012
We develop a ray‐tracing package for the calculation of path delays of microwave signals in the troposphere based on numerical weather models which we use for the determination of the delays of geodetic Very Long Baseline Interferometry (VLBI) observations.
Nafisi, V., Madzak, M., J. Böhm, J., Ardalan, A., Schuh, H.   +4 more
openaire   +3 more sources

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
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 ...
Alireza A Ardalan, Vahab Nafisi, Marcelo Santos   +2 more
exaly   +4 more sources

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

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

Enhanced troposphere delay model for SLR [PDF]

Geophysical Research Abstracts, 2019
The currently recommended troposphere delay model for Satellite laser ranging (SLR) assumes a full symmetry of the atmosphere above stations. The microwave-based techniques of space geodesy contributing to the realizations of the international reference frames, i.e.
Drożdżewski, M., Sośnica, K., Zus, F., Balidakis, K.   +3 more
openaire   +1 more source