Recommendation 2 of the 15th CCTF (2001)

Time and frequency comparisons using Global Positioning System (GPS) phase and code measurements

The Consultative Committee for Time and Frequency,

considering that

• the International GPS Service (IGS) has established an infrastructure of a global observing network, a data distribution system, a robust analysis methodology and high-quality products,
• a joint IGS/BIPM Pilot Project has been established to study time and frequency comparisons using GPS phase and code measurements,
• calibration methods are being developed to exploit fully the capabilities of these techniques for time comparisons;

fully supports the joint IGS/BIPM Pilot Project;

and recommends that

• timing laboratories participate in the IGS by installing appropriate GPS receivers and by following the IGS standards and procedures to the greatest extent possible,
• appropriate methods be exploited to calibrate the instrumental delays relating the receiver internal reference to the external clock,
• the IGS reference for clock products be aligned as much as possible with Coordinated Universal Time (UTC),
• the timing laboratories and the BIPM take the necessary steps to allow the IGS to achieve this goal.

DOI : 10.59161/CCTF2001REC2E