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From: =?iso-8859-1?Q?G=E9rard_Petit?=
To: "Jim Ray \(USNO 202-762-1444\)"
References: <200107061448.KAA22409@maia.usno.navy.mil>
Subject: [GPST] BIPM Ashtech Z12T calibration trip
Date: Mon, 9 Jul 2001 13:30:40 +0200
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Status: RO
An International Campaign to Calibrate Geodetic-type GPS Receivers
for Time Transfer
An international campaign has been initiated by the BIPM to calibrate
geodetic-type GPS receivers of the model Ashtech Z12-T, which are used for
time transfer. An absolutely calibrated Z12-T owned by the BIPM visits the
participating laboratories to perform the differential calibration of
local receivers. The first trip started in January 2001 and is under way.
Involved laboratories are the METAS (Bern, Switzerland), the BNM-LPTF
(Paris, France), the USNO (Washington DC, USA), the NPL (Teddington, UK),
the ORB (Brussels, Belgium), the CNES (Toulouse, France), the CRL (Koganei,
Japan). Results of the absolute calibration of the BIPM Z12-T have been
published in (White et al. 2001 and Petit et al. 2001a). A general
description of the differential calibration method as well as preliminary
results from the first two stages, conducted in February 2001 at METAS and
in March 2001 at the BNM-LPTF are presented in (Petit et al, 2001b).
Laboratories owning Z12-T receivers and interested in time transfer are
welcome to participate. Please contact Gérard Petit (gpetit@bipm.org). It
is anticipated that the calibration of other types of receivers, such as
the Javad Legacy, will be also addressed in the future.
J. White, R. Beard, G. Landis, G. Petit, E. Powers, 2001, Dual frequency
absolute calibration of a geodetic GPS receiver for time transfer, Proc.
15th EFTF, in press.
G. Petit, Z. Jiang, J. White, R. Beard, E. Powers, 2001a, Absolute
calibration of an Ashtech Z12-T GPS receiver, GPS Solutions 4, 4, p. 41. *
G. Petit, Z. Jiang, P. Moussay, J. White, E. Powers, G. Dudle, P. Uhrich,
2001b, Progresses in the calibration of "geodetic like" GPS receivers for
accurate time comparisons, Proc. 15th EFTF, in press. *
* preprint MS/Word files available at
http://maia.usno.navy.mil/gpst/refs.html
----------------------------------------------------------
Gerard Petit
Time section, BIPM
Address: Pavillon de Breteuil
92312 Sevres FRANCE
Phone: (33)1-45077067
FAX: (33)1-45077059
E-mail: gpetit@bipm.org (Gerard Petit)