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Title: Accurate on-line frequency calibration of a rubidium standard using INSAT STFS broadcast in differential mode
Authors: Gupta, A Sen
Das, S
Mathur, B S
Issue Date: Aug-1997
Publisher: NISCAIR-CSIR, India
Abstract: The Standard Time and Frequency Signal (STFS) broadcast via INSAT has been used to provide online frequency calibration traceable to the National Physical Laboratory (NPL, New Delhi. The method consists of tracking the phase of the received STFS relative to the local frequency standard. The slope of this phase variation gives the frequency offset. The actual experimental data used in this study consist of those collected simultaneously at the ERTL (East), Calcutta and at NPL. Although, individual data have sinusoidal diurnal residual errors due to satellite position prediction inaccuracy, these are mostly common mode errors that cancel in the differential mode, leading to the present high accuracy of frequency calibration of the order of a few parts in 1012 over a measurement period of few days.
Page(s): 228-236
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.26(4) [August 1997]

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