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Date: Thu, 26 Feb 98 17:45:49 +0100
Subject: IGS/BIPM pilot project 
To: cthomas@si.bipm.fr, jimr@Maia.usno.navy.mil
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Status: RO

   IGS/BIPM PILOT PROJECT TO STUDY ACCURATE TIME AND FREQUENCY  
        COMPARISONS USING GPS PHASE AND CODE MEASUREMENTS


Agency or group:
Time section, Bureau international des poids et mesures
92312 Sevres Cedex, France

Contact person(s): Gerard Petit

E-mail address(es): gpetit@bipm.fr

Areas of participation:
   1) Deployment of GPS receivers:          Yes
   2) GPS data analysis:                    Yes
   3) Analysis of instrumental delays:      Yes
   4) Time transfer comparisons:            Yes
   6) Other:                                
(please list)

Limitations on participation: (please list any restrictions)
None

Comments or suggestions:

Our participation is threefold:
*We provide data from an Ashtech Z12-T receiver.
*We try to calibrate and assess the stability of receiver hardware.
*We develop a competence in the analysis of data from a network of GPS receivers
for time and frequency comparisons.

The main objectives are:
1)Accurate frequency transfer: by monitoring the time variation of calibration delays,
using temperature controlled antennas.
The goal is two compare primary frequency standards to 1.d-15 in one day or less.
This will allow a better comparison and a more accurate use of their data
in the elaboration of TAI and TT(BIPM).

2)Accurate time transfer: by absolute calibration of instrumental delays.
The goal is to obtain a reference station with a calibration uncertainty of 1 ns.
This will allow to obtain a similar reading accuracy in TAI.