Results 11 to 20 of about 1,220 (193)
A Refined Spatiotemporal ZTD Model of the Chinese Region Based on ERA and GNSS Data
Remote SensingEmpirical tropospheric models can improve the performance of GNSS precise point positioning (PPP) by providing a priori zenith tropospheric delay (ZTD) information.
Yongzhao Fan, Zhimin Sha
exaly +5 more sources
A Regional Zenith Tropospheric Delay (ZTD) Model Based on GPT3 and ANN [PDF]
Remote Sensing, 2021 The delays of radio signals transmitted by global navigation satellite system (GNSS) satellites and induced by neutral atmosphere, which are usually represented by zenith tropospheric delay (ZTD), are required as critical information both for GNSS ...
Fei Yang +4 more
doaj +3 more sources
SHAtropE—A Regional Gridded ZTD Model for China and the Surrounding Areas [PDF]
Remote Sensing, 2020 A regional zenith tropospheric delay (ZTD) empirical model, referred to as SHAtropE (SHanghai Astronomical observatory tropospheric delay model—Extended), is developed and provides tropospheric propagation delay corrections for users in China and ...
Junping Chen +4 more
doaj +3 more sources
Evaluation of the ZWD/ZTD Values Derived from MERRA-2 Global Reanalysis Products Using GNSS Observations and Radiosonde Data [PDF]
Sensors, 2020 Tropospheric delay is one of the main errors affecting high-precision positioning and navigation and is a key parameter of water vapor detection in the Global Navigation Satellite System (GNSS).
Liangke Huang +5 more
doaj +3 more sources
High-Precision ZTD Model of Altitude-Related Correction
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023 Zenith tropospheric delay (ZTD) is one of the main error sources in space geodesy. The existing regional or global models, such as Global Pressure and Temperature 3 (GPT3), Global Tropospheric model, Global Hopfield, and Shanghai Astronomical observatory
Qingzhi Zhao, , Chaoqian Xu
exaly +4 more sources
MSE-impact of PPP-RTK ZTD estimation strategies [PDF]
Advances in Space Research, 2018 In PPP-RTK network processing, the wet component of the zenith tropospheric delay (ZTD) cannot be precisely modelled and thus remains unknown in the observation equations. For small networks, the tropospheric mapping functions of different stations to a given satellite are almost equal to each other, thereby causing a near rank-deficiency between the ...
Kan Wang +2 more
exaly +7 more sources
A New Global ZTD Forecast Model Based on Improved LSTM Neural Network
IEEE Journal of Selected Topics in Applied Earth Observations and Remote SensingZenith tropospheric delay (ZTD), consisting of zenith hydrostatic delay (ZHD) and zenith wet delay (ZWD), is a significant contributor to errors in precise positioning using the global navigation satellite system (GNSS) precise point positioning (PPP ...
Lin He +7 more
doaj +3 more sources
Preliminary Results on Tropospheric ZTD Estimation by Smartphone [PDF]
Remote Sensing, 2021 The Global Navigation Satellite System (GNSS) receiver is one of the many sensors embedded in smartphones. The early versions of the Android operating system could only access limited information from the GNSS, allowing the related Application Program Interface (API) to obtain only the location.
Lorenzo Benvenuto +3 more
core +5 more sources
Quality control of SIRGAS ZTD products [PDF]
Journal of Geodetic Science, 2022 AbstractThe SIRGAS-CON network currently has more than 450 continuous GNSS stations, and it is used for geodetic purposes. In atmospheric studies, it is used for ionospheric monitoring and for the estimation of zenith tropospheric delays (ZTDs). From the Neutral Atmosphere Analysis Center of SIRGAS, Centro de Ingeniería Mendoza Argentina, the final ...
María Virginia Mackern +3 more
openaire +4 more sources
Impacts of Stochastic Modeling on GPS-derived ZTD Estimations
, 2004 GPS-derived ZTD (Zenith Tropospheric Delay) plays a key role in near real-time weather forecasting, especially in improving the precision of Numerical Weather Prediction (NWP) models. The ZTD is usually estimated using the first-order Gauss-Markov process with a fairly large correlation, and under the assumption that all the GPS measurements, carrier ...
Jin, S, Wang, J
openaire +5 more sources