Results 21 to 30 of about 8,397 (209)

Real-Time Precise Point Positioning Method Considering Broadcast Ephemeris Discontinuities

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   +2 more sources

Investigation on Reference Frames and Time Systems in Multi-GNSS [PDF]

Remote Sensing, 2018
Receivers able to track satellites belonging to different GNSSs (Global Navigation Satellite Systems) are available on the market. To compute coordinates and velocities it is necessary to identify all the elements that contribute to interoperability of ...
Luca Nicolini, Alessandro Caporali
doaj   +4 more sources

Space State Representation Corrections as an Aid in Pseudolite Positioning. [PDF]

Sensors (Basel), 2019
In the presented study, the authors deal with the problem of transmission of pseudolite coordinates to the receiver. Nowadays, there is no uniquely specified method that would provide data about the position of the pseudolite to the GNSS receiver.
Rapiński J, Tomaszewski D.
europepmc   +2 more sources

A Method to Determine BeiDou GEO/IGSO Orbital Maneuver Time Periods. [PDF]

Sensors (Basel), 2019
Because there are different types of BeiDou constellations with participating geostationary orbit (GEO) and inclined geosynchronous orbit (IGSO) satellites, the maneuvering frequency of BeiDou satellites is higher than that of other navigation systems ...
Qin Z, Huang G, Zhang Q, Wang L, Yan X, Kang Y, Wang X, Xie S.   +7 more
europepmc   +2 more sources

Initial Results of Modeling and Improvement of BDS-2/GPS Broadcast Ephemeris Satellite Orbit Based on BP and PSO-BP Neural Networks

Remote Sensing, 2021
With the rapid development and gradual perfection of GNSS in recent years, improving the real-time service performance of GNSS has become a research hotspot. In GNSS single-point positioning, broadcast ephemeris is used to provide a space–time reference.
Hanlin Chen, Fei Niu, Xing Su, Tao Geng, Zhimin Liu, Qiang Li   +5 more
doaj   +1 more source

Distribution of clock correction and ephemeris parameters in broadcast navigation messages [PDF]

GPS Solutions, 2021
AbstractThe distribution of clock correction and ephemeris (CCE) parameters in navigation messages broadcast by operational satellite vehicles (SVs) of the Global Navigation Satellite System (GNSS) is studied. For this purpose, two evaluation metrics are proposed, namely atypical navigation message structures and time to complete CCE sets (TTCS).
Ivan Lapin, Jaron Samson, Stefan Wallner, Carlos Lopez, Mikael Mabilleau   +4 more
openaire   +1 more source

Performance of Multi-GNSS in the Asia-Pacific Region: Signal Quality, Broadcast Ephemeris and Precise Point Positioning (PPP)

Remote Sensing, 2022
Since BeiDou Navigation Satellite System (BDS) and Japan’s Quasi-Zenith Satellite System (QZSS) have more visible satellites in the Asia-Pacific region, and navigation satellites of Global Positioning System (GPS), Galileo satellite navigation system ...
Mengyuan Li, Guanwen Huang, Le Wang, Wei Xie, Fan Yue   +4 more
doaj   +1 more source

Accuracy Evaluation of Broadcast Ephemeris for BDS-2 and BDS-3 [PDF]

, 2021
Abstract The BDS-3 system was completed in July 2020 and began to provide services to users around the world. The inspection of its operation, especially the detailed evaluation of the orbit, clock error, TGD and other indicators, plays an important role in the subsequent positioning.
Hao Jun Jian, Yishi Wang, Shoujian Zhang
openaire   +2 more sources

A long‐term broadcast ephemeris model for extended operation of GNSS satellites [PDF]

NAVIGATION, 2020
GNSS positioning relies on orbit and clock information, which is predicted on ground and transmitted by the individual satellites as part of their broadcast navigation message. The predictions are typically refreshed at least once per day and partitioned into short-arc ephemeris data sets covering a representative validity period of 0.5-4 h.
Montenbruck, Oliver, Steigenberger, Peter, Aicher, Moritz   +2 more
openaire   +3 more sources

Multiple satellite and ground clock sources‐based high‐precision time synchronization and lossless switching for distribution power system

IET Communications, Volume 17, Issue 18, Page 2041-2052, November 2023., 2023
In this paper, we construct a multi‐clock source time synchronization model and formulate a problem to minimize the synchronization error and delay through jointly optimizing large‐timescale clock source selection and small‐timescale weight selection. A reinforcement learning‐based multi‐timescale multi‐clock source time synchronization algorithm named
Pengju Liu, Sunxun Zhang, Zhenyu Zhou, Lei Lv, Lin Huang, Jiayu Liu   +5 more
wiley   +1 more source