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Journal of Applied Geodesy

Editor-in-Chief: Kahmen, Heribert / Rizos, Chris


CiteScore 2018: 1.61

SCImago Journal Rank (SJR) 2018: 0.532
Source Normalized Impact per Paper (SNIP) 2018: 1.064

Online
ISSN
1862-9024
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Volume 5, Issue 3-4

Issues

Multiresolution real-time (MRRT) code-smoothing technique

A. El-Ghazouly
  • Department of Geomatics Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
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/ M. Elhabiby
  • Public Works Depertment, Faculty of Engineering, Ain Shams University, Khalifa El-Maamon st, Abbasiya sq., Cairo., Post Code: 11566
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/ N. El-Sheimy
  • Department of Geomatics Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
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Abstract

Global Navigation Satellite System (GNSS) receivers provide diverse measurements, namely the code and carrier phase measurements. The measurements' rates between successive epochs are similar in both observables, but the change in carrier phase can be determined on one order of magnitude higher than the change in code. This diversity of measurements is used in the measurements domain to improve position accuracy. The code measurements are contaminated with diverse errors that fall in different frequency bands (i.e., multipath error, falls in a high to medium frequency band 0.1 to 0.003 Hz, whereas the ionospheric error is in the lower frequency band 0 to 1.2e4 Hz). As these errors have different frequency components, the methodology is presented whereby the multipath error can be mitigated through frequency domain processing. In this article, an innovative codesmoothing technique is used, namely multiresolution real-time (MRRT) code-smoothing technique. This technique is used in real-time scenarios to mitigate multipath error (medium to high frequency) and noise (high frequency) and to retain the ionospheric error (low frequency) untouched in the mitigation procedure. The proposed MRRT technique is superior to those in the literature in the way that it can effectively remove the multipath and noise in real-time scenario and retain the smoothed code unbiased with low variance.

Keywords.: GNSS; Multipath; Multi-resolution; Code smoothing

About the article

Received: 2011-06-23

Accepted: 2011-11-22

Published in Print: 2011-12-01


Citation Information: Journal of Applied Geodesy, Volume 5, Issue 3-4, Pages 147–154, ISSN (Online) 1862-9024, ISSN (Print) 1862-9016, DOI: https://doi.org/10.1515/JAG.2011.017.

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