Results 61 to 70 of about 3,196 (215)
Remote Sensing, 2022 Global navigation satellite system (GNSS) signals are affected by refraction when traveling through the troposphere, which result in tropospheric delay. Generally, the tropospheric delay is estimated as an unknown parameter in GNSS data processing.
Huan Zhang +6 more
doaj +1 more source
Journal of Geophysical Research: Atmospheres, Volume 131, Issue 12, 28 June 2026.Abstract This study examines the large‐scale atmospheric response to reduced evapotranspiration during droughts in the Western U.S., using an observation‐based regression method and numerical experiments with a global climate model. We found that Western U.S.
A. C. T. Sena, I. N. Williams
wiley +1 more source
Propagation Problems in Satellite Navigation [PDF]
, 2007 The presentation provides an overview about the mechanisms of the main propagation phenomena which are relevant for satellite navigation, their magnitude, temporal and regional variation and standard methods to correct and mitigate ...
Hornbostel, Achim
core
A comprehensive comparison of atmospheric mapping functions for GPS measurements in Egypt
Journal of Geodetic Science, 2012 The principal limiting error source in the Global Positioning System (GPS) is the mismodeling of the delay experienced by radio waves in propagating through the atmosphere.
Younes S. A., Elmezayen A. G.
doaj +1 more source
An ERA5 tropospheric parameters-augmented approach for improving GNSS precise point positioning
Geodesy and Geodynamics, 2023 Precise Point Positioning (PPP) technology has developed into a potent instrument for geodetic positioning, ionospheric modeling, tropospheric atmospheric parameter detection, and seismic monitoring.
Liangke Huang +6 more
doaj +1 more source
Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.Abstract Reducing methane emissions is important for restricting surface temperature increases. However, methane also influences stratospheric ozone, and its recovery, via chemical and radiative processes. Using the United Kingdom Earth System Model's state‐of‐the‐art methane emission‐driven capability, we examine the impact of methane emission ...
James Weber +7 more
wiley +1 more source
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 +5 more
core
Green Emissions of Atomic Oxygen at Sprite Tops Explained
Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.Abstract Green emissions from excited Oxygen in Sprite Tops (GhOSTs) are due to the 557 nm photons emitted from atomic oxygen (O) $(\mathrm{O})$ excited to the 1S state. In this work we compare the possible contribution of various mechanisms for excitation of O(S1) $\mathrm{O}({}^{1}S)$ under application of a lightning‐induced electric field to the ...
Brandon Smith +2 more
wiley +1 more source
A Tunable Closed-Form Model for the Structure Function of Tropospheric Delay [PDF]
IEEE Geoscience and Remote Sensing Letters, 2008 Several interferometric synthetic aperture radar applications could benefit from the availability of a closed-form model for the second-order statistics of atmospheric delay. Due to the variability of the latter, it would also be desirable for the model to be tunable to some acquisition-specific information, describing the atmospheric state.
John P. Merryman Boncori, Johan J. Mohr
openaire +1 more source
, 2023 In the GNSS analysis the signal travel time delay induced by the neutral atmosphere is parameterized. The related parameters are derived from a climatology or better yet from a Numerical Weather Model (NWM). Current thinking is that NWMs are not accurate
Zus, Florian +4 more
core +1 more source