Results 31 to 40 of about 137,331 (82)
Journal of Geophysical Research: Space Physics, Volume 126, Issue 12, December 2021., 2021 Abstract A major problem in the precise orbit determination (POD) of satellites at altitudes below 1,000 km is the modeling of the aerodynamic drag which mainly depends on the thermospheric density and causes the largest non‐gravitational acceleration. Typically, empirical thermosphere models are used to calculate density values at satellite positions ...
Lea Zeitler +7 more
wiley +1 more source
Geodetic Datum Realization Using SLR‐GNSS Co‐Location Onboard Galileo and GLONASS
Journal of Geophysical Research: Solid Earth, Volume 126, Issue 10, October 2021., 2021 Abstract Modern satellites of Global Navigation Satellite Systems (GNSS) are equipped with laser retroreflector arrays for Satellite Laser Ranging (SLR). Laser range observations to GNSS satellites allow for the co‐location of two space geodetic techniques onboard navigation satellites.
G. Bury +4 more
wiley +1 more source
Precise real‐time navigation of LEO satellites using GNSS broadcast ephemerides
NAVIGATION, Volume 68, Issue 2, Page 419-432, Summer 2021., 2021 Abstract The availability of orbit information with high precision and low latency is a key requirement for many Earth‐observation missions, predominantly in the field of radio occultation. Traditionally, precise orbit determination solutions of low‐Earth orbit (LEO) satellites are obtained offline on ground after downloading GNSS measurements and ...
André Hauschild, Oliver Montenbruck
wiley +1 more source
Intraseasonal Variations in Atmospheric and Oceanic Excitation of Length‐of‐Day
Earth and Space Science, Volume 8, Issue 3, March 2021., 2021 Abstract Like the seasonal and interannual variations in length‐of‐day (LOD), variations on intraseasonal timescales (periods shorter than 183 days) are also predominantly caused by changes in the angular momentum of the zonal winds. But the smaller intraseasonal LOD excitations from atmospheric surface pressure, oceanic currents, and the ocean bottom ...
Nan Yu +5 more
wiley +1 more source
The impact of erroneous a priori information on the estimation of UT1-UTC in VLBI Intensive sessions
, 2022 With the help of VLBI 24-hour sessions it is possible to determine a large number of parameters, including station and source coordinates, the Earth orientation parameters and parameters modelling the atmospheric delays.
Böhm, Johannes; orcid: +5 more
core +4 more sources
Journal of Geophysical Research: Solid Earth, Volume 125, Issue 9, September 2020., 2020 Abstract Different Earth orientation parameter (EOP) time series are publicly available that typically arise from the combination of individual space geodetic technique solutions. The applied processing strategies and choices lead to systematically differing signal and noise characteristics particularly at the shortest periods between 2 and 8 days.
R. Dill +9 more
wiley +1 more source
Combined SAI-SHAO prediction of Earth Orientation Parameters since 2012 till 2017
Geodesy and Geodynamics, 2018 As the participants of Earth Orientation Parameters Combination of Prediction Pilot Project (EOPC PPP), Sternberg Astronomical Institute of Moscow State University (SAI) and Shanghai Astronomical Observatory (SHAO) have accumulated ∼1800 days of Earth ...
Leonid Zotov +3 more
doaj +1 more source
Earth and Space Science, Volume 13, Issue 5, May 2026.Abstract Polar motion prediction is an important means to study the dynamics of Earth's rotation and detect the internal structure of the Earth. This paper proposes an LS + iTransformer method that combines the least squares (LS) method with the iTransformer deep learning model. Using IERS EOP 20 C04 data from 2000 to 2022, Fast Fourier Transform (FFT)
Huizhong Zhu +5 more
wiley +1 more source
Remote Sensing, 2019 Sentinel-3A/3B (S3A/B) satellites are equipped with a number of precise instruments dedicated to the measurement of surface topography, sea and land surface temperatures and ocean and land surface color.
Dariusz Strugarek +6 more
doaj +1 more source
Research on Polar Motion Prediction Accuracy Based on ETH and GFZ Angular Momentum Forecast Products
Earth and Space Science, Volume 13, Issue 5, May 2026.Abstract Polar motion (PM), a critical element of Earth Orientation Parameters (EOP), is essential for high‐precision applications such as deep space exploration and satellite navigation. Recent advances in prediction methods utilizing Effective Angular Momentum (EAM) data have become a key pathway for enhancing PM forecast accuracy.
Xishun Li +10 more
wiley +1 more source