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Sat, 7 Mar 1998 10:34:31 +0300 (MSK)
Date: Sat, 7 Mar 1998 10:34:31 +0300 (MSK)
From: "Kaufman M.B."
Message-Id: <199803070734.KAA03370@mx.iki.rssi.ru>
To: cthomas@bipm.fr, jimr@Maia.usno.navy.mil
Status: RO
E-mail: cthomas@bipm.fr
jimr@maia.usno.navy.mil
Dear Dr. Claudine Thomas
Dear Dr. Jim Ray
This is to inform you that the National Service for Time,
Frequency and Earth Orientation Parameter (EOP) determination
will take part in the IGS/BIPM Pilot project to study accurate
time and frequency comparisons using GPS phase and code
measurements. The stations in Mendeleevo (MDVO) and Irkoutsk
(IRKT) are to participate.
Below you will find a form duly filled by us for getting
answers:
Agency or group: The Institute of Metrology for Time and Space
(IMVP GP VNIIFTRI) - a center of the National
Service for Time, Frequency and EOP determina-
tion of Russia.
Contact persons: Sergey Poushkin
Leonid Sinenko
Nikoly Koshelyaevsky
E-mail address: imvp@mx.iki.rssi.ru
Areas of participation:
1.Deployment of GPS receivers Y
2.GPS data analysis Y
3.Analysis of instrumental delays Y
4.Time transfer comparisons Y
5.Other: we propose to start simultanously a compain for
GLONASS observations in the same areas.
Best regards
Victor Tatarenkov
Director, IMVP
From imvp@mx.iki.rssi.ru Thu Jun 18 06:45:14 EDT 1998
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Thu, 18 Jun 1998 14:44:19 +0400 (MSD)
Date: Thu, 18 Jun 1998 14:44:19 +0400 (MSD)
From: "Kaufman M.B."
Message-Id: <199806181044.OAA06522@mx.iki.rssi.ru>
To: cthomas@bipm.fr, jimr@maia.usno.navy.mil
Status: RO
Dear colleagues,
We confirm our participation in the IGS/BIPM pilot project
to study accurate time and frequency comparisons using GPS
phase and code GPS measurements.
The following sites of the reference facilities of the State
Time and Frequency Service of Russia will take part in the
experiment:
- IMVP (Mendeleevo)
- East-Siberian NIIFTRI (Irkoutsk)
- VNIIFTRI(Khabarovsk)
The equipment in all these sites contains Hydrogen standards
with frequency instability less than 1*10E-14 and are furnished
with GPS, GLONASS receivers or GPS/GLONASS receivers.
We have made the required preparatory arrangements:
- signal delays in antenna-feeder channels and in cables for
feeding second pulses from the hydrogen standards to the
receivers and time intervals meters are defined;
- f=5MHz signals from the hydrogen standards to the receivers
are fed;
- communication links for transmitting measuring data from
the sites to the Center for data processing are tested. Experi-
mental processing of GPS measurements are performed ( the
measurements are made at the IGS stations) with the purpose of
time scale comparisons. By preliminary evaluation the accuracy
of comparisons was less than 0,1ns.
- a schedule of the site operation (around-the-clock with a
technological interruption for not more than 1 hour per day)
and a schedule of data transmission to the center for data
processing (not less than once per day) is determined;
-preliminary measurements with the GPS/GLONASS and GLONASS
receivers are made on small baselines at the basic station (Men-
deleevo) during May-June;
- the coordinates of the phase antenna centers are defined at
Mendeleevo and Irkoutsk sites with a centimeter accuracy;
Our sites are equipped with the following devices:
Mendeleevo - GPS receiver Trimble 4000SSE(two-frequency);
GPS/GLONASS receiver Ashtech Z-18 (two-frequency); GLONASS
receiver Trimble 4000SGL (two-frequency).
Irkoutsk - GPS receiver Turbo Rogue (two-frequency); GLONASS
receiver Trimble 4000SGL (one-frequency).
Khabarovsk - GPS/GLONASS receiver Ashtech Z-18
(two-frequency).
The Mendeleevo and Irkoutsk stations have been operating in the
IGS network since 1994 and 1995 correspondingly.
Regular comparisons of the standards between each other
and with the BIPM using GPS/GLONASS signals are being made at
three above stations.
Because of the planned work we couldn't arrive for the meeting
of the Working Group held in June. It would be of interst for
us to get a short information on the presentations and
decisions as made.
Looking forward to your proposals for programmes of joint
measurements,
Sincerely yours,
S.B.Poushkin
Vice-director, IMVP