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From: Pascale Defraigne 
Message-Id: <199802201031.KAA11168@helios.oma.be>
Subject: Response to CALL
To: jimr@Maia.usno.navy.mil
Date: Fri, 20 Feb 1998 10:31:32 +0000 (UTC)
Cc: cthomas@bipm.fr
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Status: RO

Response to CALL FOR PARTICIPATION in an

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


Agency or group: Royal Observatory of Belgium (ROB)
                 Av. Circulaire 3
                 B-1180 Brussels
                 Belgium

Contact person(s): Carine BRUYNINX
                   Pascale DEFRAIGNE
                   Rene WARNANT

E-mail address(es): C.Bruyninx@oma.be
		    P.Defraigne@oma.be
		    R.Warnant@oma.be


Areas of participation:
   1) Deployment of GPS receivers:          Yes
   2) GPS data analysis:                    No
   3) Analysis of instrumental delays:      Yes
   4) Time transfer comparisons:            No
   5) Other: clock comparisons by single differences on phases is foreseen


Limitations on participation: (please list any restrictions)

Comments or suggestions:

  The Royal Observatory of Belgium combines two observational
  activities relevant to the IGS/BIPM pilot project :
   - The permanent TurboRogue GPS receiver in Brussels belongs, since
     November 1993, to the IGS network (as a non-global station) and is
     therefore included into the ITRF.
     Precise reference frequency is provided to the  GPS receiver by a
     hydrogen Maser maintained by the ROB time laboratory.
   - The time laboratory of the ROB participates to the realization of
     TAI by sending the measurements of its clocks to the BIPM.
     In 1997, data  from 3 Cesium clocks and one Maser clock were
     submitted to the BIPM. The ROB clocks are located in thermostatised
     basements with limited humidity and temperature variations.
     The time transfer to TAI is presently done using a NBS type receiver.
     From mid-1998 a double frequency GLONASS/GPS (3S-Navigation :
     R-100/40T) will be used for both time transfer and participation
     to the upcoming IGEX-98 GLONASS observation campaign.
     A 8-channel Motorola Oncore receiver is also planned to be put into
     operation during 1998.

  The L1-L2 differential instrumental delays of the GPS receiver in
  Brussels have been determined and are continuously monitored since 1993.
  This work is  done within the  frame of a study of the ionospheric
  disturbance on the GPS signal. This long experience demonstrates the
  relevant contribution of the ROB with respect to the analysis of
  instrumental delays as proposed in the IGS/BIPM pilot project.


 Taking the above mentioned activities into account, the ROB proposes to
 contribute to the IGS/BIPM Pilot Project with :
   - the data from its permanent GPS (TurboRogue) and GLONASS
     (3S-Navigation,R-100/40T) receivers in Brussels
   - a contribution to the analysis of receiver specific instrumental
     delays