Results 141 to 150 of about 653 (164)

Tropospheric zenith delay monitoring in GPS precise point positioning

SPIE Proceedings, 2009
Precise point positioning (PPP) has been demonstrated to be a powerful sensor to monitor tropospheric zenith delay (TZD). In the PPP, some unmodelled biases still remain in the GPS observables and will inevitably degrade the precision of tropospheric zenith delay estimation.
Qing-lin Zhu, Zhen-sen Wu, Zhen-wei Zhao
openaire   +1 more source

Comparison of Tropospheric Zenith Wet Delay from VLBI and GNSS Estimations

2021
<p>Tropospheric delay is one of the major error sources for space geodetic techniques such as Very Long Baseline Interferometry (VLBI) and Global Navigation Satellite System (GNSS). In this study, we compared the agreement of tropospheric zenith wet delay (ZWD) seasonal variations derived from VLBI and GNSS observations at 8 stations that
Vicky Jia Liu, Maaria Nordman, Nataliya Zubko   +2 more
openaire   +1 more source

Prediction of Zenith Tropospheric Delay Based on BP Neural Network

2012
This paper used improved Levenberg-Marquart BP neural network technology to predict GPS tropospheric delay with the data of Beijing GPS data and meteorological data, which the input parameters are either space position (longitude, latitude, elevation) or space position, temperature, pressure.
Yong Wang, Lihui Zhang, Jing Yang
openaire   +1 more source

A Zenith Tropospheric Delay Interpolation Method Considering Elevation

2023 3rd International Conference on Electrical Engineering and Control Science (IC2ECS), 2023
Zhuoya Liu, Shuzhou Xiao, Xin Luo, Kang Yan, Youzhuo Zheng   +4 more
openaire   +1 more source

Combination of long time-series of troposphere zenith delays observed by VLBI

Journal of Geodesy, 2007
Within the International Very Long Baseline Interferometry (VLBI) Service for Geodesy and Astrometry (IVS), long time-series of zenith wet and total troposphere delays have been combined at the level of parameter estimates. The data sets were submitted by eight IVS Analysis Centers (ACs) and cover January 1984 to December 2004.
Heinkelmann, R., Böhm, J., Schuh, H., Bolotin, S., Engelhardt, G., MacMillan, D., Negusini, M., Skurikhina, E., Tesmer, V., Titov, O.   +9 more
openaire   +4 more sources

Influence of tropospheric zenith delays obtained by GPS and VLBI on station heights

2002
The least-squares fit of VLBI data analysis reveals a high correlation between station height parameters and tropospheric zenith path delay parameters. Thus, the station heights estimated by a VLBI least-squares solution are severely affected if tropospheric refraction is modeled insufficiently or if there is a lack of observations at low elevations ...
J. Böhm, H. Schuh, R. Weber
openaire   +1 more source

A machine learning model for the vertical correction of tropospheric zenith delays

Tropospheric delay is one of the most important error sources for space geodetic techniques, such as the Global Navigation Satellite Systems (GNSS). A priori tropospheric Zenith Hydrostatic and Wet Delays (ZHD and ZWD) should be obtained properly in advance to the GNSS data processing.
Peng Yuan, Kyriakos Balidakis, Jungang Wang, Zhiguo Deng   +3 more
openaire   +1 more source

Analysis and Estimation of Zenith Wet Delay and Zenith Tropospheric Total Delay at Earth’s different Geographical Areas

2021 Seventh International Conference on Aerospace Science and Engineering (ICASE), 2021
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EFFECTS OF TROPOSPHERIC ZENITH DELAY IN SINGLE BASELINE DETERMINATION

2004
Mohd Zahlan Mohd Zaki, Md Nor Kamaruddin
openaire   +1 more source

A Refined Zenith Tropospheric Delay Model Based on a Generalized Regression Neural Network and the GPT3 Model in Europe

Atmosphere, 2023
Ke Fuyang
exaly