Results 81 to 90 of about 266,964 (192)

AVALIAÇÃO PRELIMINAR DA TÉCNICA DE PPP EM TEMPO REAL USANDO EFEMÉRIDES IG

Revista Brasileira de Cartografia, 2017
A técnica de Posicionamento por Ponto Preciso (PPP) em modo pós-processado tem sido largamente utilizada como alternativa ao posicionamento relativo.
Renan Rodrigues da Motta, Luiz Paulo Souto Fortes   +1 more
doaj  

Multi‐Instrument Investigation of the Pre‐Seismic Ionospheric Response to 2021 Haiti Earthquake

Earth and Space Science, Volume 12, Issue 10, October 2025.
Abstract The study of pre‐seismic variations in the ionosphere due to 2021 Haiti earthquake (Mw = 7.2) is carried out using ground and space‐based instruments. The day time ionospheric response is analyzed using Vertical Total Electron Content (VTEC) from IGS stations and electron density from Swarm satellite data.
Sreeba Sreekumar, G. Manju, Tarun K. Pant   +2 more
wiley   +1 more source

Accuracy Assessment and Rainfall Intensity Response Mechanisms in GNSS Real‐Time PPP Water Vapor Retrieval: Coupling Effects of Multi‐Source Real‐Time Products and Meteorological Conditions

Earth and Space Science, Volume 12, Issue 9, September 2025.
Abstract The Global Navigation Satellite System (GNSS) real‐time Precise Point Positioning (PPP) technology offers a highly efficient approach for atmospheric Precipitable Water Vapor (PWV) monitoring and extreme weather warning. However, its retrieval accuracy is limited by the performance of orbit and clock products, as well as the coupling effects ...
Wenliang Gao, Guigen Nie, Yu Guo, Jiaqi Shi, Shuguang Wu   +4 more
wiley   +1 more source

Cálculo dos vetores de posição e velocidade dos satélites GLONASS a partir das efemérides transmitidas e aspectos relacionados à sua integração com o GPS [PDF]

, 2013
This paper presents details on the estimation of position and velocity vectors for GLONASS satellites from their broadcasted ephemeris using forth-order Runge-Kutta integration method and deals with the compatibility between GLONASS ephemeris and GPS ...
STATELLA, Thiago, MONICO, João F. G., NOGUEIRA, José R., AGUIAR, Claudinei R.   +3 more
core   +2 more sources

Behaviour of large scale structures of the electron content as a key parameterfor range errors in GNSS applications

Annals of Geophysics, 2004
The Total Electron Content (TEC) of the ionosphere is a key parameter for describing the ionospheric state. This paper deals with the large scale behaviour of TEC under low and high solar activity conditions.
L. Ciraolo, R. Leitinger, N. Jakowski
doaj   +1 more source

Statistical Approach to Research on the Relationship Between Kp/Dst Geomagnetic Indices and Total GPS Position Error

Remote Sensing
This study examines the impact of geomagnetic disturbances quantified by the Kp and Dst indices on the accuracy of single-frequency GPS positioning across mid-latitudes and the equatorial zone, with a focus on temporal and spatial positioning errors ...
Mario Bakota, Igor Jelaska, Serdjo Kos, David Brčić   +3 more
doaj   +1 more source

An evaluation of potential solar radio emission power threat on GPS and GLONASS performance

, 2012
The L-band solar radio emission has recently been regarded as a potential threat to stable GPS and GLONASS performance. However, the threat has not been completely investigated or assessed so far.
Afraimovich, Edward L., Jin, Shuanggen, Demyanov, Vladislav V.   +2 more
core  

RAIM Algorithms Analysis for a Combined GPS/GALILEO Constellation [PDF]

, 2005
How far a user can rely on his navigation system is a central question for safety of life applications like air navigation especially in approach phases. For Oceanic, En route or Non Precision Approach phases, the integrity requirements as defined by
Gass, Frédéric, Belabbas, Boubeker
core  

Satellite laser ranging to GPS and GLONASS [PDF]

, 2015
Satellite laser ranging (SLR) to the satellites of the global navigation satellite systems (GNSS) provides substantial and valuable information about the accuracy and quality of GNSS orbits and allows for the SLR-GNSS colocation in space.
Dach, Rolf, Daniel Arnold, Beutler, Gerhard, Steigenberger, Peter, Rolf Dach, Daniela Thaller, Gerhard Beutler, Sosnica, Krzysztof Jakub, Arnold, Daniel, Thaller, Daniela, Krzysztof Sośnica, Adrian Jäggi, Peter Steigenberger, Sosnica, Krzysztof, Jäggi, Adrian   +14 more
core   +2 more sources

Modernizing GNSS data acquisition, pre-processing, and distribution at volcanological observatories [PDF]

Geoscientific Instrumentation, Methods and Data Systems
In recent years, the field of geodetic monitoring is undergoing a profound transformation driven by the transition from GPS-only positioning to a fully multi-GNSS environment.
P. Sakic, P. Boissier, P. Boissier, J.-M. Saurel, S. Deroussi, S. Deroussi, A. Andrieu, A. Andrieu, C. Griot, C. Griot, A. Bosson, A. Bosson, C. Vidal, C. Vidal, C. Pardo, J.-B. de Chabalier   +15 more
doaj   +1 more source