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Related Experiment Video

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Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

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Published on: June 25, 2021

Improved GPS-based time link calibration involving ROA and PTB.

Héctor Esteban¹, Juan Palacio, Francisco Javier Galindo

¹Real Instituto y Observatorio de la Armada, San Fernando, Spain. hesteban@roa.es

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|March 10, 2010

Summary

This study calibrates the Global Positioning System (GPS) time transfer link between ROA and PTB. Results show GPS can calibrate two-way satellite time and frequency transfer (TWSTFT) links with sub-nanosecond uncertainty.

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Area of Science:

Metrology
Geodesy
Timekeeping

Background:

Accurate time transfer is crucial for realizing International Atomic Time (TAI).
Existing calibration methods for time transfer links can be resource-intensive.

Purpose of the Study:

To calibrate the GPS time transfer link between ROA and PTB.
To evaluate the feasibility of using GPS for calibrating two-way satellite time and frequency transfer (TWSTFT) links.

Main Methods:

Utilized a traveling geodetic-type GPS receiver for time transfer.
Employed carrier phase Precise Point Positioning (PPP) comparison techniques.
Re-calibrated a TWSTFT link using one month of GPS data.

Main Results:

Achieved calibration of the GPS time transfer link with evaluated type A and B uncertainties.
Demonstrated that GPS time comparisons can calibrate TWSTFT links with uncertainty below 2 ns.
Indicated potential for achieving sub-nanosecond uncertainty in TWSTFT calibration via GPS.

Conclusions:

GPS time transfer provides a novel and cost-effective method for calibrating TWSTFT links.
This approach offers a viable alternative to traditional traveling TWSTFT station calibrations.
Sub-nanosecond accuracy in TWSTFT calibration is achievable using GPS.