Developing an IGS time scale

Author

Senior, K. ; Matsakis, Demetrios

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

211

Lastpage

218

Abstract

Currently, the International GPS Service (IGS) provides a set of clock products for both satellites and tracking receivers, tabulated at 5-minute intervals. These products provide users with sufficient information to determine consistent coordinates and clock values for an isolated GPS receiver with a precision at roughly the 5-cm level. However, because the underlying time scale for the IGS combined clocks is based on a linear alignment to broadcast GPS time for each day separately, the day-to-day stability of this reference is poor. We show the results of a new filter package written to automate the production of an integrated IGS frequency scale loosely steered to GPS time and to which the IGS clock products will soon be referenced

Keywords

Global Positioning System; Kalman filters; atomic clocks; frequency stability; frequency standards; measurement uncertainty; time series; white noise; IGS time scale; International GPS Service; Kalman filter implementation; carrier-phase time transfer; clock products; combined clocks; consistent coordinates; covariance; day-to-day stability; filter package; frequency stability; integrated IGS frequency scale; isolated GPS receiver; linear alignment; near-real time system; satellites; tracking receivers; weighted ensemble; white noise; Clocks; Filters; Frequency estimation; Frequency measurement; Global Positioning System; Masers; Phase estimation; Production; Satellite broadcasting; Stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium and PDA Exhibition, 2001. Proceedings of the 2001 IEEE International

Conference_Location

Seattle, WA

ISSN

1075-6787

Print_ISBN

0-7803-7028-7

Type

conf

DOI

10.1109/FREQ.2001.956188

Filename

956188