Original scientific paper
https://doi.org/10.7305/automatika.53-4.245
Multi-Stage Satellite Phase and Code Bias Estimation
Zhibo Wen
; Institute for Communications and Navigation, Faculty of Electrical Engineering and Information Technology, Technische Universität München, Theresienstrasse 90, DE-80333, Munich, Germany
Patrick Henkel
; Institute for Communications and Navigation, Faculty of Electrical Engineering and Information Technology, Technische Universität München, Theresienstrasse 90, DE-80333, Munich, Germany
Christoph Günther
; Institute for Communications and Navigation, Faculty of Electrical Engineering and Information Technology, Technische Universität München, Theresienstrasse 90, DE-80333, Munich, Germany
Abstract
Precise point positioning with satellite navigation signals requires knowledge of satellite code and phase biases. In this paper, a new multi-stage method is proposed for estimating of these biases using measurements from a geodetic network. Themethod first subtracts all available a priori knowledge on orbits, satellite clocks andmultipath from the measurements to reduce their dynamics. Secondly, satellite phase biases, ionospheric delays, carrier phase integer ambiguities and the geometry combining all non-dispersive parameters are jointly estimated in a Kalman
filter. Finally, the a posteriori geometry estimates are refined in a second Kalman filter for the computation of orbital errors, code biases and tropospheric delays. As the first Kalman filter introduces time correlation, a generalized Kalman filter for colored measurement noise is applied in the second stage. The proposed algorithm is applied to dual frequency GPS measurements from a local geodetic network in Germany. A remarkable bias stability with variations of less than 3 cm over 4 hours is observed.
Keywords
Satellite navigation; Phase biases; Code biases; Ambiguity resolution
Hrčak ID:
94020
URI
Publication date:
5.12.2012.
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