Results 141 to 150 of about 2,145,064 (260)

Kinematic Zenith Tropospheric Delay Estimation with GNSS PPP in Mountainous Areas. [PDF]

Sensors (Basel), 2021
Gratton P, Banville S, Lachapelle G, O'Keefe K.   +3 more
europepmc   +1 more source

GSI‐UNet: Extracting Geomagnetic and Solar Indices Features for Real‐Time Global Ionospheric Map Enhancement

Space Weather, Volume 24, Issue 4, April 2026.
Abstract Real‐time Global Ionospheric Map (RT‐GIM) products, provided by the International GNSS Service (IGS), are designed to support time‐sensitive applications by offering ionospheric information with only a few minutes of latency. However, their accuracy falls far short of the high‐precision Final GIM, particularly during periods of intense solar ...
Yonggai Zhuang, Meiling Wang, Haixin Wu
wiley   +1 more source

Improving GNSS precise point positioning with tropospheric constraints from data-driven numerical weather prediction model

Geo-spatial Information Science
Accurate priori tropospheric knowledge is advantageous for Global Navigation Satellite System (GNSS) precise point positioning (PPP), which significantly influences both convergence time and the accuracy of tropospheric delay estimations.
Yuanfan Deng, Wu Chen, Junsheng Ding, Ahmed El-Mowafy, Duojie Weng, Long Tang, Lei Bai, Xiaolong Mi   +7 more
doaj   +1 more source

Detection Threshold Estimates for InSAR Time Series: A Simulation of Tropospheric Delay Approach. [PDF]

Sensors (Basel), 2021
Havazli E, Wdowinski S.
europepmc   +1 more source

The Evolution of the Ionospheric Irregularities and Their Effects on GNSS Over China During the Geomagnetic Storm on 1 December 2023

Space Weather, Volume 24, Issue 4, April 2026.
Abstract This study investigated a large‐scale ionospheric irregularities event over low‐ to mid‐latitude China during the 1 December 2023 geomagnetic storm using ROTI data, loss‐of‐lock (LoL) in L2 from 250 GNSS receivers, and S4 data from 16 ISMs.
Yi Zeng, Donghe Zhang, Ke Li, Yaoyu Tian, Guanglin Yang   +4 more
wiley   +1 more source

The Eddy Experiment: accurate GNSS-R ocean altimetry from low altitude aircraft

, 2004
During the Eddy Experiment, two synchronous GPS receivers were flown at 1 km altitude to collect L1 signals and their reflections from the sea surface for assessment of altimetric precision and accuracy.
Elfouhaily, F. Soulat, G. Ruffini, Lowe, Lowe, M. Caparrini, M. Martín-Neira, Martín-Neira, O. Germain, Picardi, Rius, Ruffini, Zavorotny   +12 more
core   +1 more source

Tropospheric monitoring technology for gravity wave experiments [PDF]

Tropospheric refractivity fluctuations are an important error source for gravity wave detection by Doppler tracking in that they alter the phase and phase rate of electromagnetic signals. Estimates are presented of the effect of tropospheric fluctuations
Resch, G. M., Treuhaft, R. N.
core   +1 more source

Deep space tracking in local reference frames [PDF]

A self-calibrating deep space tracking technique is described which can potentially produce two nanoradian angular spacecraft determinations. The technique uses very long base interferometric observations of a spacecraft and several radio sources.
Treuhaft, R. N.
core   +1 more source

Atmospheric dispersion and the implications for phase calibration [PDF]

, 2009
The success of any ALMA phase-calibration strategy, which incorporates phase transfer, depends on a good understanding of how the atmospheric path delay changes with frequency (e.g. Holdaway & Pardo 2001).
Curtis, Emily I., Nikolic, Bojan, Pardo, Juan R., Richer, John S.   +3 more
core  

Optimized GNSS tropospheric delay model for high-precision dam deformation monitoring in large height difference environments

Array
Tropospheric delay is a critical error in Global Navigation Satellite System (GNSS) high-precision positioning, particularly in dam deformation monitoring requiring millimeter-level accuracy.
Yan Chen, Xingyu Zhou, Xiaowu Hu, Xuexi Liu, Zhuoni Jin, Jiayan Shen, Mingyuan Zhang, Jie Wang   +7 more
doaj   +1 more source