Results 151 to 160 of about 763,719 (165)

A New Grid Model for the Vertical Correction of Zenith Hydrostatic Delay for China

Lecture Notes in Electrical Engineering, 2021
Tropospheric delay is an important error source in GNSS (Global Navigation Satellite System) navigation and positioning, and its variation in the vertical direction is much greater than that in the horizontal direction. Some shortages still exist in current zenith hydrostatic delay (ZHD) vertical stratification models for China, such as only single ...
Lilong Liu, Junyu Li, Si Xiong
exaly   +2 more sources

Quantitative Assessment of Meteorological and Tropospheric Zenith Hydrostatic Delay Models

Advances in Space Research, 2016
Abstract Tropospheric delay has always been an important issue in GNSS/DORIS/VLBI/InSAR processing. Most commonly used empirical models for the determination of tropospheric Zenith Hydrostatic Delay (ZHD), including three meteorological models and two empirical ZHD models, are carefully analyzed in this paper.
Jiming Guo, Di Zhang, Junbo Shi
exaly   +2 more sources

A Precise Zenith Hydrostatic Delay Calibration Model in China Based on the Nonlinear Least Square Method

Journal of Atmospheric and Oceanic Technology, 2023
Abstract Zenith hydrostatic delay (ZHD) is a crucial parameter in Global Navigation Satellite System (GNSS) navigation and positioning and GNSS meteorology. Since the Saastamoinen ZHD model has a larger error in China, it is significant to improve the Saastamoinen ZHD model.
Xia Pengfei, Xiaoxing He, Zhiping Chen
exaly   +2 more sources

Calibration of Zenith Hydrostatic Delay Model for Local GPS Applications

Radio Science, 2000
Determination of dry zenith delay, DZD, is important for separating wet zenith delay with high accuracy from Global Positioning System (GPS) measurements. The existing models are usually for the calculation of the zenith hydrostatic delay, ZHD. Because the zenith hydrostatic delay includes the contribution of water vapor and is also not accurate enough,
Liu, Y, Iz, HB, Chen, YQ
exaly   +3 more sources

A Discussion of Height Reductions for Zenith Hydrostatic Delays Derived From Weather Models

Journal of Applied Geodesy, 2011
L Morel
exaly   +2 more sources

GPS Zenith Delay Sensitivity Evaluated From High-Resolution Numerical Weather Prediction Simulations of the 8–9 September 2002 Flash Flood Over Southeastern France

Journal of Geophysical Research D: Atmospheres, 2006
International audienceEstimations of zenith total delays (ZTD) were obtained during postprocessing of a high-resolution (2.4 km) nonhydrostatic atmospheric model (Méso-NH).
Cédric Champollion, Hugues Brenot, Olivier Caumont   +2 more
exaly   +2 more sources

Global, Spatially Explicit Modelling of Zenith Wet Delay With XGBoost

Journal of Geodesy
Radio signals transmitted by Global Navigation Satellite System (GNSS) satellites experience tropospheric delays. While the hydrostatic part, referred to as zenith hydrostatic delay (ZHD) when mapped to the zenith direction, can be analytically modelled ...
Matthias Schartner, Florian Zus, Linda See   +2 more
exaly   +3 more sources

An Improved Mean-Gravity Model for GPS Hydrostatic Delay Calibration

IEEE Geoscience and Remote Sensing Letters, 2007
The determination of global positioning system (GPS) heights with submillimeter accuracy needs proper correction of tropospheric delay. In this letter, the modeling of zenith hydrostatic delay (ZHD) was addressed, considering that wet delay must be ...
Pierre Bosser, Olivier Böck
exaly   +2 more sources

Assessment of Saastamoinen Zenith Hydrostatic Tropospheric Delay Accuracy in Different Latitudes

Proceedings (EAGE)
B. Kladochnyi, F. Zablotskyi
exaly   +2 more sources

Case Study on Zenith Hydrostatic Delay Calibration Models for Forecast Vienna Mapping Function 3 and Their Impact on GNSS Precipitable Water Vapor Retrieval

IEEE Transactions on Geoscience and Remote Sensing
Lilong Liu, Junyu Li, Yibin Yao
exaly   +2 more sources