Results 11 to 20 of about 1,106,314 (231)

Real-Time Precise Point Positioning Method Considering Broadcast Ephemeris Discontinuities [PDF]

Navigation
With advancements in the broadcast ephemeris accuracy of global navigation satellite systems (GNSSs), precise point positioning based on broadcast ephemeris (BE-PPP) is gradually showing promising prospects.
Quanrun Cheng, Junping Chen, Yize Zhang, Chao Yu   +3 more
doaj   +4 more sources

A new interpolation method based on satellite physical character in using IGS precise ephemeris

Geodesy and Geodynamics, 2014
Due to the deficiency of sliding Lagrange polynomial interpolation, the author proposes a new interpolation method, which considers the physical character of satellite movement in coordinate transformation and reasonable selection of interpolation ...
Liu Weiping, Hao Jinming
doaj   +4 more sources

Impact of the precise ephemeris on accuracy of GNSS baseline in relative positioning technique [PDF]

VIETNAM JOURNAL OF EARTH SCIENCES, 2020
For advanced geodesy tasks that require high-accuracy, such as tectonics, surveying services usually use not only long-baselines but also the duration of tracking GNSS satellites in a long (e.g., 24/7). The accuracy of these baselines in baseline analysis is dominated by inaccuracy satellite positioning and orbit, leading to specified accuracy may not ...
Dinh Trong Tran, Dinh Huy Nguyen, Ngoc Dung Luong, Duy Toan Dao   +3 more
semanticscholar   +3 more sources

The orbit of Triton with new precise observations and the INPOP19a ephemeris [PDF]

Astronomy & Astrophysics, 2020
Aims. The Gaia catalogue brings new opportunities and challenges to high-precision astronomy and astrometry. The precision of data reduction is therefore improved by a large number of reference stars with high-precision positions and proper motions. Numerous precise positions for Triton are obtained from the latest observations using the Gaia catalogue.
K. Tang, Y. Z. Song, K. X. Shen, R. C. Qiao, Z. H. Tang, Y. Yu, H. Y. Zhang, D. Yan   +7 more
semanticscholar   +3 more sources

Thermospheric mass density measurement from precise orbit ephemeris

Geodesy and Geodynamics, 2016
Atmospheric drag, which can be inferred from orbit information of low-Earth orbiting (LEO) satellites, provides a direct means of measuring mass density.
Junyu Chen, Jizhang Sang
doaj   +3 more sources

The retrieval of atmosphereric water vapor based on Beidou Ultra-rapid precise ephemeris using different mapping functions

IOP Conference Series: Materials Science and Engineering, 2020
Abstract The atmospheric mapping function is an important model to convert the total tropospheric delay on the slant path of satellite signal into the zenith tropospheric delay. It is important to choose the appropriate mapping function to improve the accuracy of water vapor estimation. Beidou observation data in different seasons from 6
Qiuying Guo, Jianhui Hou, Xuxiang Wu
semanticscholar   +3 more sources

A Three-Step Method for Determining Unhealthy Time Period of GPS Satellite Orbit in Broadcast Ephemeris and Its Preliminary Applications for Precise Orbit Determination [PDF]

Remote Sensing, 2019
Abnormal information of satellite orbits inevitably appears in the broadcast ephemeris. Failure to obtain unhealthy information on GPS satellite orbits in precise orbit determination (POD) degrades GPS service performance.
Fei Ye, Yunbin Yuan, Baocheng Zhang, Bingfeng Tan, Jikun Ou   +4 more
doaj   +3 more sources

Precise Orbit Determination for Cislunar Space Satellites: Planetary Ephemeris Simplification Effects [PDF]

Aerospace
The cislunar space navigation satellite system is essential infrastructure for lunar exploration in the next phase. It relies on high-precision orbit determination to provide the reference of time and space.
Hejin Lv, Nan Xing, Yong Huang, Peijia Li   +3 more
doaj   +3 more sources

Analysis of Accuracy Positioning Performance of Low-Cost and Geodetic GNSS Using Precise and Broadcast Ephemeris

IOP Conference Series: Earth and Environmental Science
The accuracy of GNSS positioning is largely determined by the type of ephemeris data applied. These include broadcast ephemeris, which is accessible in real time, and precise ephemeris, which is released after post-processing by institutions like the International GNSS Service (IGS).
Septya Zahrina Azatil Ismah, Putra Maulida   +1 more
semanticscholar   +3 more sources

Izračun položaja GPS-satelita iz podatkov preciznih efimerid : GPS-orbit computation from precise ephemeris data [PDF]

Geodetski Vestnik, 2005
The article describes the theoretical point of view of the GPS precise ephemerides application that should be used in most precise GPS processing. Regarding broadcast, precise ephemerides allow us to achieve a much better accuracy of the final GPS ...
Bojan Stopar, Polona Pavlovčič Prešeren   +1 more
doaj   +3 more sources