Computation and quality control of differential GPS corrections

Conference paper (1995)

Authors

Xin Xiang Jin External organisation
H. van der Marel Mathematical Geodesy and Positioning - CEG
Cees de Jong External organisation
Research Group
Mathematical Geodesy and Positioning (CEG) (TU Delft)
More Info
expand_more

Published Date

1995

Language

English

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Faculty

Civil Engineering & Geosciences

Department

Geoscience and Remote Sensing

Research Group

Mathematical Geodesy and Positioning

Abstract

The DGPS technique can considerably improve the accuracy of stand-alone GPS positioning, but the improvement depends on the distance between the user and the reference station (spatial correlation), the latency of differential corrections (temporal correlation), and the quality of differential corrections. Therefore, how to correctly generate differential corrections as well as their precision is one of the keys to the DGPS positioning technique. This paper presents a new algorithm for generating differential GPS corrections. This algorithm directly uses code and carrier observations in the measurement model of a Kalman filter, so that it is possible to use a simple stochastic observation model and to use the standard algorithm of the Kalman filter. The algorithm accounts for biases like multipath errors and instrumental delays in code observations and it clearly shows how differential corrections are differently affected by code biases when dual or single frequency data are used. In addition, the algorithm can be integrated with a recursive quality control procedure. As a consequence, the quality of differential corrections can be guaranteed with certain probability.