Results 81 to 90 of about 732,269 (162)

The Numerical Simulation of the Atmosphere Delays Impact on Radar Measurement in Aviation

Communications, 2019
The article presents numerical simulations with regard to determining the impact of the ionospheric and tropospheric delays on a radar-aircraft slant distance measurement.
Kamil Krasuski, Artur Gos
doaj   +1 more source

A New Global ZTD Forecast Model Based on Improved LSTM Neural Network

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Zenith 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, Yibin Yao, Chaoqian Xu, Zhang Huan, Feifei Tang, Changquan Ji, Zhuoya Liu, Wentan Wu   +7 more
doaj   +1 more source

Penentuan Zenith Tropospheric Delay Dan Precipitable Water Vapor Menggunakan Perangkat Lunak Gamit [PDF]

, 2015
The signals from each Global Positioning System (GPS) satellites that orbiting above the earth's surface will be received by a receiver through the layers of atmosphere.
Susilo, S. (Susilo), Gusfarienza, H. (Heri), Yuwono, B. D. (Bambang), Awaluddin, M. (Moehammad)   +3 more
core  

Analysis of the Accuracy of GMF, NMF, and VMF1 Mapping Functions with GPT 50 a Priori Zenith Constraint in Tropospheric Delay Modelling [PDF]

, 2015
This paper compares the accuracy of the different mapping. Global Mapping Function (GMF), Niell Mapping Function (NMF) and Updated Vienna Mapping Function (VMF1), the update of Vienna Mapping Function (VMF) are the mapping functions studied.When ...
Hunegnaw, Addisu, Makabayi, Brian
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Quantitative analysis of the tropospheric delay difference using empirical mapping functions on VLBI stations

Frontiers in Astronomy and Space Sciences
Tropospheric delay is a major error source for the high-accuracy Very Long Baseline Interferometry (VLBI) technique due to rapid water vapor variations. The Niell mapping function (NMF) and Global Mapping Function (GMF) are extensively applied to convert
W. L. Zhou, W. L. Zhou, W. L. Zhou, W. L. Zhou, S. L. Song, S. L. Song, J. Jiang, J. Jiang, X. Hu, P. J. Li, P. J. Li, Z. B. Zhang, Z. B. Zhang, Z. B. Zhang   +13 more
doaj   +1 more source

Deep Neural Networks for Refining Vertical Modeling of Global Tropospheric Delay

Geophysical Research Letters
Kinematic airborne platforms are becoming increasingly vital for Earth observation. They highlight the critical need for accurate tropospheric delay corrections across varying altitudes, especially as most existing models are limited to Earth's surface ...
Peng Yuan, Kyriakos Balidakis, Jungang Wang, Pengfei Xia, Jian Wang, Mingyuan Zhang, Weiping Jiang, Harald Schuh, Jens Wickert, Zhiguo Deng   +9 more
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Grid Residual Tropospheric Corrections for Improved Differential GPS Positioning Over the Victoria GPS Network (GPSnet)

, 2004
. Tropospheric delay is one of the major error sources in GPS positioning. The delay of radio signals caused by the troposphere can range from 2 m at the zenith to 20 m at lower elevation angles.
Yanming Feng, Yi Zheng, Zheng, Yi, Zhengdong Bai, Feng, Yanming, Bai, Zhengdong   +5 more
core   +1 more source

GFZTD: A Multimodal Fusion-Driven 3-D Tropospheric Delay Prediction Model Coupling Self-Attention and ConvLSTM

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Tropospheric delay, for which water vapor is a major cause, is a significant source of error in the global navigation satellite system. This article presents the gray figure-based zenith tropospheric delay prediction (GFZTD) model, which is built on ...
Yixin Zhu, Zhimin Sha, Pengzhi Wei, Shirong Ye, Pengfei Xia, Fangxin Hu   +5 more
doaj   +1 more source

Precise estimation of tropospheric path delays with GPS techniques [PDF]

, 1990
Tropospheric path delays are a major source of error in deep space tracking. However, the tropospheric-induced delay at tracking sites can be calibrated using measurements of Global Positioning System (GPS) satellites.
Lichten, S. M.
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Effect of GPS tropospheric delay Neill mapping function simplification [PDF]

, 2009
The mathematical modeling on the mapping function models should be revised and also simplified to improve the calculation of the GPS tropospheric delay.
Sakidin, Hamzah, Matori, Abd. Nasir, Mohamed Shariff, Abdul Rashid, Md Noorani, Mohd Salmi, Mohamed, Azhari, Abu Bakar, Mohd Rizam   +5 more
core   +1 more source