Results 141 to 150 of about 1,078 (176)

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   +3 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

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

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

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

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

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

Fast tropospheric delay predictions for antenna height diversity

IEEE Transactions on Communications, 1997
Terrestrial microwave links sometimes suffer from signal fading which may be relieved with antenna diversity or frequency diversity. Vertical spacing of the antennas has been known empirically to offer performance gains for many links. A fast new method for tropospheric delay predictions is discussed. It uses Mathematica for critical functional fits to
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Estimation of Tropospheric Delay Models Compliance

2008
Tropospheric delay can be a significant source of error for satellite-based positioning systems, if it is not properly estimated. Two basic types of delay prediction models exist. The first use surface meteorological parameters to estimate the magnitude of the tropospheric delay, and the other global models use average and seasonal variation data.
Kos, Tomislav, Markežić, Ivan
openaire   +2 more sources

Assessment of BeiDou’s Tropospheric Model (IGGtrop) for tropospheric delay correction in northern hemisphere

Journal of Applied Geodesy, 2019
Abstract Satellite navigation systems face different types of errors that affect the positioning accuracy. The tropospheric delay considers one of the major sources of error for the transmitted signal that could face a tropospheric delay of over 2 m at zenith and 20 m at lower satellite elevation angles. A positioning error of 10 m could
openaire   +1 more source