Results 151 to 160 of about 1,062 (188)

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
openaire   +2 more sources

An impact of estimating tropospheric delay gradients on tropospheric delay estimations in the summer using the Japanese nationwide GPS array

Journal of Geophysical Research: Atmospheres, 2003
We used various analysis strategies to evaluate zenith tropospheric delays (ZTDs) retrieved from the Japanese nationwide Global Positioning System (GPS) array in the summer of 1996. We compared results from the network solution obtained by daily routine data analyses and two‐point positioning analyses with and without a tropospheric delay gradient ...
Tetsuya Iwabuchi, Shin'ichi Miyazaki, Kosuke Heki, Isao Naito, Yuki Hatanaka   +4 more
openaire   +1 more source

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

Improved parameterization of the tropospheric delay based on NWM

2023
The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
Dogan, Ali Hasan, Zus, Florian
openaire   +3 more sources

Estimation of tropospheric time delay for Indian LAAS

2013 International Conference on Emerging Trends in VLSI, Embedded System, Nano Electronics and Telecommunication System (ICEVENT), 2013
In LAAS with airport pseudolites (APLs), error introduced in the signals due to tropospheric time delay proves to be the largest in pseudolite error budget. In this paper, tropospheric delay (TD) is estimated using Hopfield model and RTCA model for a typical LAAS scenario. Hopfield model is used to estimate delay in GPS signal and RTCA model is used to
Q. Sultana, A. D. Sarma, M. Q. Javeed
openaire   +1 more source

Analysis of Regional Distribution and Change of Tropospheric Delay

Applied Mechanics and Materials, 2014
In this article, data of stations distributed over China was used to calculate tropospheric delay. The result was compared with the tropospheric zenith delay calculated from model. The rules and Characteristic of tropospheric delay over China was analyzed from the aspect of altitude, climate, and change.
Hai Shen Wang, Chuang Shi, Yun Chang Cao
openaire   +1 more source