In 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) [10.1109/FCS.2016.7546751].

Characterization & consequences of GPS Rb clock lamplight variations

FORMICHELLA, VALERIO;SESIA, ILARIA;SIGNORILE, GIOVANNA;GALLEANI, Lorenzo;TAVELLA, PATRIZIA
2016

Abstract

In 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.
2016
9781509020911
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2658467
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