Results 51 to 60 of about 3,334 (205)
NavigationPlans to establish a satellite network around the Moon to support communication, position, navigation, and timing services are rapidly evolving. Satellites that are part of this system broadcast their ephemeris as finite parameters to lunar users for ...
Marta Cortinovis +2 more
doaj +1 more source
Implementation and performance analysis of real time PPP software based on GAMP
Dianzi Jishu Yingyong, 2022 Aiming at the problem that GAMP software lacks the function of real-time precise point positioning at this stage, this paper analyzes and studies the principle and process of the post precise point positioning algorithm in the software, compares the ...
Liu Ya, He Wentao, Zhang Jie
doaj +1 more source
Long term frequency stability analysis of the GPS NAVSTAR 6 Cesium clock [PDF]
, 1982 Time domain measurements, taken between the NAVSTAR 6 Spacecraft Vehicle (SV) and the Vandenberg Global Positioning System (GPS) Monitor Site, by a pseudo random noise receiver, were collected over an extended period of time and analyzed to estimate the ...
Buisson, J. +3 more
core +1 more source
The Benefit of Space Clocks for the Deep Space Network
Radio Science, Volume 60, Issue 8, August 2025.Abstract Ground‐based atomic clocks have been the foundation of the Deep Space Network's (DSN's) ability to provide high‐precision tracking to deep space users for navigation and radio science since its inception in the mid‐1960s. This paper describes the development of space clocks that could aid the DSN and the solar system exploration enterprise ...
T. Ely, E. Burt, K. Cheung, R. Tjoelker
wiley +1 more source
A Flexible Ephemeris Representation for GNSS and Alternative PNT Signal Sources Using B-Splines
Navigation, 2023 Most global navigation satellite systems (GNSSs) ephemeris representations require straightforward, albeit specialized algorithms to compute the transmitter position at a time of interest.
Mikaela Dobbin, Penina Axelrad
doaj +1 more source
Method and apparatus for autonomous, in-receiver prediction of GNSS ephemerides [PDF]
, 2012 Methods and apparatus for autonomous in-receiver prediction of orbit and clock states of Global Navigation Satellite Systems (GNSS) are described. Only the GNSS broadcast message is used, without need for periodic externally-communicated information ...
Bar-Sever, Yoaz E., Bertiger, William I.
core +1 more source
Engineering Reports, Volume 7, Issue 7, July 2025.Some stations have slightly larger errors in mid low latitude regions, while others have slightly smaller errors in high latitude regions. By comparing the B1C/B2a and B2b/B3I IFC SPP results of all 84 stations, it was found that the RMSE of all stations with B2b/B3I IFC was greater than that of B1C/B2a. ABSTRACT This article analyzes the BDS Phase III
Xingli Sun, Jinjie Yao
wiley +1 more source
Impacts of Satellite Orbit and Clock on Real-Time GPS Point and Relative Positioning
Sensors, 2017 Satellite orbit and clock corrections are always treated as known quantities in GPS positioning models. Therefore, any error in the satellite orbit and clock products will probably cause significant consequences for GPS positioning, especially for real ...
Junbo Shi +3 more
doaj +1 more source
Galileo and EGNOS as an asset for UTM safety and security [PDF]
, 2019 GAUSS (Galileo-EGNOS as an Asset for UTM Safety and Security) is a H2020 project1 that aims at designing and developing high performance positioning systems for drones within the U-Space framework focusing on UAS (Unmanned Aircraft System) VLL (Very Low ...
Andrade-Cetto, Juan +7 more
core
Ionospheric Delays Compensation for On-The-Fly Integer Ambiguity Resolution in Long Baseline LEO Formations [PDF]
, 2014 This paper deals with the real-time onboard accurate relative positioning by Carrier-phase Differential GPS (CDGPS) of LEO formations with baselines of hundreds of kilometers.
Tancredi, Urbano
core +1 more source