From jimr@maia.usno.navy.mil Fri Apr  9 08:29:24 EDT 1999
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From: Jim Ray (USNO 202-762-1444) 
Message-Id: <199904091227.IAA28175@maia.usno.navy.mil>
Subject: IGS/BIPM report to CCTF
To: gpst@maia.usno.navy.mil
Date: Fri, 09 Apr 1999 8:27:09 EDT
X-Mailer: Elm [revision: 212.4]
Status: RO

Gerard Petit and I have prepared an interim report for the 14th meeting
of the Consultative Committee for Time and Frequency (CCTF), 20-22 April.
A copy of the report is available at
http://maia.usno.navy.mil/gpst/refs/cctf.ps [122.6 kB]
in postscript format.

We will submit the following recommendation for consideration:

                         PROPOSED RECOMMENDATION

     Time and frequency comparisons using GPS phase and code measurements

The CCTF,

considering

- that the IGS has established an infrastructure of global GPS observing
  network, data distribution system, robust analysis methodology, and
  high-quality products,
- that a joint IGS/BIPM Pilot Project has been established to study time
  and frequency comparisons using GPS phase and code measurements,
- that calibration methods are still lacking to fully exploit 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 following the IGS standards and
  procedures to the greatest extent possible,
- that appropriate methods be developed to calibrate the instrumental
  delays relating the receiver internal reference to the external clock,
- that the IGS reference for clock products be aligned as much as
  possible to UTC,
- that the timing laboratories and the BIPM take the necessary steps
  to allow the IGS to realize this goal.


Best regards,
--Jim