On the algorithm of processing observation datum of GPS common-view in near real-time

Details On the algorithm of processing observation datum of GPS common-view in near real-time On the algorithm of processing observation datum of GPS common-view in near real-time

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003acasn..44..204y&link_type=abstract

Acta Astronomica Sinica, vol. 44, no. 2, p. 204-214

Astronomy and Astrophysics

Astronomy

Astronometry: Time, Gps Common-View, Methods: Miscellaneous

Scientific paper

GPS common-view time transfer in near real-time may be implemented by processing observation data with high speed and high precision, but normal smoothing and filtering method is not satisfied with near real-time case. Based on the datum from GPS common-view, a Kalman filtering algorithm is presented, in which the clock difference at remote different places can be obtained. The reductions of the common-view data from National Time Service Center(NTSC) and Communications Research Laboratory(CRL) which locate at a distance of about 2000,km, and that from CRL and the Korea Research Institute of Standards and Science(KRIS) which locate at a distance of about 1000,km show that the root mean square of time differences obtained by Kalman filter, and from Circular T are better than 2.9,ns and 2.6,ns respectively. Furthermore, when GPS CV in near real-time is applied in multi-sites, in order to improve precision, a technique of indirect observation adjustment after Kalman filtering algorithm is presented, in which the observation weight is set according to the distance between two sites. With reference to the clock difference from Circular T of BIPM, a comparison between data before and after adjustment shows that common-view after adjustment in near real-time is more accurate.

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