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EnglishIn the rubidium atomic frequency standard (RAFS), an rf-discharge lamp produces the device's atomic signal. As a consequence of the light-shift effect, variations in the lamplight's intensity result in variations in the RAFS' output frequency. While the basic physics of the light-shift is reasonably well understood, its operational implications for GNSS performance are only beginning to be fully appreciated. Here, we summarize results examining decade-long histories of on-orbit GPS RAFS lamplight variations. In addition to a deterministic variation that is well modeled by the sum of an exponential and linear trend, the stochastic variations appear to be of three types: lamplight jumps, repeating lamplight ramps, and non-stationary lamplight noise. Employing an estimated GPS RAFS light-shift coefficient, these variations can be used to infer lamplight-induced RAFS frequency variations.
Characterization & consequences of GPS Rb clock lamplight variations / Camparo, J.; FORMICHELLA, VALERIO; SESIA, ILARIA; SIGNORILE, GIOVANNA; GALLEANI, Lorenzo; TAVELLA, PATRIZIA. - ELETTRONICO. - (2016), pp. 1-4. ((Intervento presentato al convegno 70th IEEE International Frequency Control Symposium, IFCS 2016 tenutosi a New Orleans, Louisiana, USA nel 2016.
| Titolo: | Characterization & consequences of GPS Rb clock lamplight variations |
| Autori: | |
| Data di pubblicazione: | 2016 |
| Abstract: | In the rubidium atomic frequency standard (RAFS), an rf-discharge lamp produces the device's atom...ic signal. As a consequence of the light-shift effect, variations in the lamplight's intensity result in variations in the RAFS' output frequency. While the basic physics of the light-shift is reasonably well understood, its operational implications for GNSS performance are only beginning to be fully appreciated. Here, we summarize results examining decade-long histories of on-orbit GPS RAFS lamplight variations. In addition to a deterministic variation that is well modeled by the sum of an exponential and linear trend, the stochastic variations appear to be of three types: lamplight jumps, repeating lamplight ramps, and non-stationary lamplight noise. Employing an estimated GPS RAFS light-shift coefficient, these variations can be used to infer lamplight-induced RAFS frequency variations. |
| ISBN: | 9781509020911 |
| Appare nelle tipologie: | 4.1 Contributo in Atti di convegno |
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| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| Characterization & Consequences of GPS Rb Clock Lamplight Variations.pdf | Articolo principale | 2a Post-print versione editoriale / Version of Record | Non Pubblico - Accesso privato/ristretto | Administrator Richiedi una copia |
http://hdl.handle.net/11583/2658467
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