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Andria Bilich

ANDRIA BILICH is a geodesist with the National Geodetic Survey’s Geosciences Research Division in Boulder, Colorado. Her research interests include GPS multipath characterization, antenna calibration, and precision improvements to high-rate positioning for geoscience applications. She received her B.S. in geophysics in 1999 from the University of Texas and a Ph.D. in aerospace engineering in 2006 from the University of Colorado. Dr. Bilich was the recipient of the 2007 Parkinson Award from The Institute of Navigation for her dissertation titled Improving the Precision and Accuracy of Geodetic GPS: Applications to Multipath and Seismology.
 

Article
Innovation: It's Not All Bad   October 1, 2009
By: Andria Bilich,Kristine M. Larson

Telltale signs of multipath are the fluctuations in the signal-to-noise ratios (SNRs) reported by some GNSS receivers. In this month’s column, the authors look at how an analysis of SNR values can be used to map the multipath environment surrounding an antenna so that models of multipath can be...more >>

Blog
Geometry of Multipath Errors   April 11, 2008
By: Andria Bilich

As discussed in a previous posting, multipath remains as a largely unmitigated source of GNSS positioning error — it is a site-specific error that is difficult to model and therefore difficult to remove from multipath-corrupted GNSS range observables. This article discusses one way to at least...more >>

Blog
Introduction to Multipath: Why is multipath such a problem for GNSS?   January 19, 2008
By: Andria Bilich

Multipath is exactly what it sounds like — a signal that travels more than one path. When GNSS radio waves propagate from the GNSS satellite toward the receiving antenna, it is possible for the incoming radio signal to travel more than one path via either reflection, diffraction, or scattering.




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