New IGS Station and Satellite Clock Combination |
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| Authors: | Jan Kouba Tim Springer |
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| Institution: | (1) Geodetic Survey Division, NRCAn, Ottawa, Canada, K1A 0E9, CA;(2) Astronomical Institute, University of Berne, Switzerland, CH |
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| Abstract: | Following the principles set forth in the Position Paper #3 at the 1998 Darmstadt Analysis Center (AC) Workshop on the new
International GPS Service (IGS) International Terrestrial Reference Frame (ITRF) realization and discussions at the 1999 La
Jolla AC workshop, a new clock combination program was developed. The program allows for the input of both SP3 and the new
clock (RINEX) format (ftp://igsch.jpl.nasa.gov//igscb/data/format/rinex_clock.txt). The main motivation for this new development
is the realization of the goals of the IGS/BIPM timing project. Besides this there is a genuine interest in station clocks
and a need for a higher sampling rate of the IGS clocks (currently limited to 15 min due to the SP3 format). The inclusion
of station clocks should also allow for a better alignment of the individual AC solutions and should enable the realization
of a stable GPS time-scale.
For each input AC clock solution the new clock combination solves and corrects for reference clock errors/instabilities as
well as satellite/station biases, geocenter and station/satellite orbit errors. External station clock calibrations and/or
constraints, such as those resulting from the IGS/BIPM timing pilot project, can be introduced via a subset of the fiducial
timing station set, to facilitate a precise and consistent IGS UTC realization for both station and satellite combined clock
solutions. Furthermore, the new clock combination process enforces strict strict conformity and consistency with the current
and future IGS standards.
The new clock combination maintains orbit/clock consistency at millimeter level, which is comparable to the best AC orbit/clock
solutions. This is demonstrated by static GIPSY precise point positioning tests using GPS week 0995 data for stations in both
Northern and Southern Hemispheres and similar tests with the Bernese software using more recent data from GPS week 1081. ?
2001 John Wiley & Sons, Inc. |
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