A multi-frequency method to improve the long-term estimation of GNSS clock corrections and phase biases
The space segment of the Global Navigation Satellite System (GNSS) is equipped with highly stable atomic clocks. In order to use these clocks as references, their time offsets must be estimated from ground measurements as accurately as possible. This work presents a multi-frequency and multi-constel...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/358993 |
| Acceso en línea: | https://hdl.handle.net/2117/358993 https://dx.doi.org/10.1002/navi.453 |
| Access Level: | acceso abierto |
| Palabra clave: | Artificial satellites in navigation Data transmission systems Global Positioning System Clock stability Day boundary discontinuity (DBD) Global Navigation Satellite Systems (GNSS) Integer ambiguity resolution (IAR) International GNSS Service (IGS) Phase biases Satèl·lits artificials en navegació Dades--Transmissió Sistema de posicionament global Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Satèl·lits i ràdioenllaços Àrees temàtiques de la UPC::Física::Astronomia i astrofísica |
| Sumario: | The space segment of the Global Navigation Satellite System (GNSS) is equipped with highly stable atomic clocks. In order to use these clocks as references, their time offsets must be estimated from ground measurements as accurately as possible. This work presents a multi-frequency and multi-constellation method for estimating satellite and receiver clock corrections, starting from unambiguous, uncombined, and undifferenced carrier-phase measurements. A byproduct of the estimation process is phase biases (i.e., the hardware delays of the carrier-phase measurements occurring at receivers and satellites). The stability and predictability of our clock estimates for receivers and satellites (GPS and Galileo) are compared with those obtained by the International GNSS Service (IGS), whereas the phase biases are assessed against two independent determinations involving combinations of carrier-phase measurements. We conclude that the method reduces day boundary discontinuities in the clock corrections, and that the estimated phase biases reproduce variabilities already observed by other authors. |
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