Evolution of orbit and clock quality for real-time multi-GNSS solutions
Kamil Kaźmierski , Radosław Zajdel , Krzysztof Sośnica
AbstractHigh-quality satellite orbits and clocks are necessary for multi-GNSS precise point positioning and timing. In undiferenced GNSS solutions, the quality of orbit and clock products signifcantly infuences the resulting position accuracy; therefore, for precise positioning in real time, the corrections for orbits and clocks are generated and distributed to users. In this research, we assess the quality and the availability of real-time CNES orbits and clocks for GPS, GLONASS, Galileo, and BeiDou-2 separated by satellite blocks and types, as well as the product quality changes over time. We calculate the signal-in-space ranging error (SISRE) as the main orbit and clock quality indicator. Moreover, we employ independent orbit validation based on satellite laser ranging. We found that the most accurate orbits are currently available for GPS. However, Galileo utmost stable atomic clocks compensate for systematic errors in Galileo orbits. As a result, the SISRE for Galileo is lower than that for GPS, equaling 1.6 and 2.3 cm for Galileo and GPS, respectively. The GLONASS satellites, despite the high quality of their orbits, are characterized by poor quality of clocks, and together with BeiDou-2 in medium and geosynchronous inclined orbits, are characterized by SISRE of 4–6 cm. BeiDou-2 in geostationary orbits is characterized by large orbital errors and the lowest availability of real-time orbit and clock corrections due to a large number of satellite maneuvers. The quality of GNSS orbit and clock corrections changes over time and depends on satellite type, block, orbit characteristics, onboard atomic clock, and the sun elevation above the orbital plane.
|Journal series||GPS Solutions, ISSN 1080-5370, e-ISSN 1521-1886, (N/A 140 pkt)|
|Publication size in sheets||0.55|
|Keywords in English||Signal-in-space range error, GNSS orbits and clocks, Real-time positioning, Multi-GNSS, PPP|
|License||Journal (articles only); published final; ; with publication|
|Score||= 140.0, 20-04-2021, ArticleFromJournal|
|Publication indicators||= 0; = 3; : 2018 = 2.561; : 2019 = 3.61 (2) - 2019=4.397 (5)|
|Citation count*||5 (2021-05-16)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.