Frequency Syntonization Using GPS Carrier Phase Measurements
Resource
IEEE Transactions on Instrumentation and Measurement 50 (3): 833-838
Journal
IEEE Transactions on Instrumentation and Measurement
Journal Volume
50
Journal Issue
3
Pages
833-838
Date Issued
2001
Date
2001
Author(s)
Abstract
A new methodology of frequency syntonization using GPS carrier phase double differences is presented. The proposed scheme can achieve the traceability of frequency dissemination and obtain the very high frequency stability in the short term, as well as in the long term. The GPS receivers used in our system were elaborately modified in order to estimate the frequency offset of the remote low-cost oven-controlled crystal oscillator clock with respect to the primary cesium atomic clock in real time by performing the double differences on the GPS carrier phase observables. The fuzzy controller and the proportional-derivative controller were employed to implement the controllers of our system, respectively. Through the D/A converter, the remote clock was then steered to synchronize with the primary clock. For averaging times of one day under the configuration of about a 30-m baseline, our experimental results show that the accuracy of the remote clock can be improved from about 3/spl times/10/sup -9/ to about 3/spl times/10/sup -14/, and the stability of the remote clock can be improved from about 3/spl times/10/sup -10/ to about 2/spl times/10/sup -14/. Moreover, the 30-m baseline tests with the common high-performance cesium clock revealed that our system has a frequency stability of about 2/spl times/10/sup -16/ for averaging times of one day.
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Type
journal article
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