Results 131 to 140 of about 653 (164)

Application of ANFIS model for prediction of zenith tropospheric delay

2013 3rd International Conference on Instrumentation, Communications, Information Technology and Biomedical Engineering (ICICI-BME), 2013
Tropospheric delay plays a crucial role in meteorological studies and weather forecasts as well as positioning accuracy. GPS derived zenith tropospheric delay (ZTD) has been established two decades ago. However, the main problem that still present is not all strategic points around the world will have a GPS receiver. To solve this shortcoming, a neural
Wayan Suparta, Kemal Maulana Alhasa
openaire   +1 more source

GPS zenith tropospheric delay (ZTD) variability in the Mediterranean

Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy, 2001
Abstract In the context of the MAGIC project (Meteorological Applications of GPS Integrated Column Water Vapor Measurements in the Western Mediterranean), zenith tropospheric delays (ZTD) are computed from Global Positioning System (GPS) signals at permanent sites in the western Mediterranean area continuously since November 1998.
Haase, J., Vedel, H., Ge, M., Calais, E.
openaire   +3 more sources

Model of mapping function for the calculation of zenith tropospheric delay

2013 International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves, 2013
Today the global navigation satellite system (GNSS) are widely used in various fields related to the precise locations of consumers. High demand for these systems and the diversity of their use is a prerequisite for a detailed consideration of issues to increase their accuracy.
V.I. Lutsenko, I.V. Lutsenko, D.O. Popov, A.G. Laush, V.N. Gudkov   +4 more
openaire   +1 more source

A new method for vertical stratification of zenith tropospheric delay

Advances in Space Research, 2019
Abstract Tropospheric delay is an important error source in space geodetic techniques. It varies significantly with height and the height dependent tropospheric error remains one of the major limitations in Global Navigation Satellite System (GNSS) techniques especially in Network Real-Time Kinematic (RTK) with significant topography variations ...
Yufeng Hu, Yibin Yao
openaire   +1 more source

Study on Tropospheric Zenith Delay Solved by GPS Data

2009 First International Conference on Information Science and Engineering, 2009
The tropospheric zenith delay of Great Wall station in Antarctic grouped with surrounding IGS stations is solved by GAMIT/GLOBK software using GPS observational data. In the process of solving, IGS final ephemeris and precision forecast ephemeris are used to solve the zenith delay in the software.
Yingchun Yue, Xiong Pan, Miao He
openaire   +1 more source

GPS-derived zenith tropospheric delay assimilation into numeric atmosphere model

SPIE Proceedings, 2014
© 2014 SPIE. The total zenith tropospheric delay (ZTD) is an important parameter of the atmosphere and directly or indirectly reflects the weather processes and variations. This paper presents a hardware and software complex for continuous measurements and prediction of atmospheric thermodynamics and radiowaves refraction index.
Khutorova O., Krasnov V., Jouravlev A., Khutorov V.   +3 more
openaire   +3 more sources

Quantifying the impact of environmental loading on Zenith Tropospheric Delays in Europe

2022
<p>We assess the impact of the environmental loading on the Zenith Total Delay (ZTD) time series estimated within the second re-processing campaign of the EUREF Permanent GNSS Network (EPN). In particular, we used one solution provided by the ASI (Agenzia Spaziale Italiana Centro di Geodesia Spaziale, Italy), and two solutions provided by
Anna Klos, Janusz Bogusz, Rosa Pacione, Vincent Humphrey, Henryk Dobslaw   +4 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

Evaluation of zenith tropospheric delays estimated by different regression models

2022
Yapay zekâ ve makine öğrenimi alanındaki gelişmeler, GNSS uygulamalarındaki sorunlara alternatif çözümler sunmakta veya mevcut çözümlerin verimliliğini artırmaya imkân sağlamaktadır. GNSS’de karşılaşılan birçok hata vardır ve bu hatalar kullanıcılar için problem oluşturmaktadır. Troposferik gecikme bunlardan birisidir.
AKAR, Ali Utku, İNAL, Cevat
openaire   +2 more sources

New versions of the BDS/GNSS zenith tropospheric delay model IGGtrop

Journal of Geodesy, 2014
The initial IGGtrop model proposed for Chinese BDS (BeiDou System) is not very suitable for BDS/GNSS research and application due to its large data volume while it shows a global mean accuracy of 4 cm. New versions of the global zenith tropospheric delay (ZTD) model IGGtrop are developed through further investigation on the spatial and temporal ...
Yunbin Yuan, Zishen Li, Yuei-An Liou
exaly   +2 more sources