A Refined Spatiotemporal ZTD Model of the Chinese Region Based on ERA and GNSS Data [PDF]
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 +4 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 +4 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 +4 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
Chaoqian Xu, Qingzhi Zhao, Yibin Yao
exaly +4 more sources
A New Global ZTD Forecast Model Based on Improved LSTM Neural Network [PDF]
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
Regional zenith tropospheric delay prediction using DBO-optimized CNN-LSTM with multihead attention [PDF]
Scientific ReportsZenith Total Delay (ZTD) is integral to applications such as atmospheric water vapor inversion and precise positioning in the Global Navigation Satellite System (GNSS).
Ruixue Yang +3 more
doaj +2 more sources
TransXLT: A novel ZTD prediction method with SASR-based data reconstruction. [PDF]
iScienceTraditional Zenith Tropospheric Delay (ZTD) models often face difficulties in maintaining prediction accuracy under complex meteorological conditions and data loss. To address this, we propose the transformer-xLSTM (TransXLT) model, which integrates spatial-temporal information from global navigation satellite system (GNSS) stations, ERA5 (global ...
Shicheng Xie +7 more
europepmc +4 more sources
Assessment of ZTD Derived from COSMIC Occultation Data with ECWMF, Radiosondes, and GNSS. [PDF]
Sensors (Basel), 2022 Global Navigation Satellite System (GNSS) signals generate slant tropospheric delays when they pass through the atmosphere, which is recognized as the main source of error in many spatial geodetic applications. The zenith tropospheric delay (ZTD) derived from radio occultation data is of great significance to atmospheric research and meteorology and ...
Fu N +8 more
europepmc +4 more sources
High Conversion Efficiency in Intrinsic High Power-Density Mg<sub>2</sub>Sn-GeTe Thermoelectric Generator. [PDF]
Adv Sci (Weinh)First Mg2Sn–GeTe thermoelectric generator achieves 9% efficiency by strategically modulating power factor–thermal conductivity interplay in intrinsically high‐power‐density system. Abstract Thermoelectric generators (TEGs) offer a sustainable solution for thermal energy harvesting, where maximizing energy output necessitates achieving both high power ...
Wu X +6 more
europepmc +2 more sources