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Inside GNSS magazine • Volume 3, Number 6
September/October 2008
Online News, Articles, and Features
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Cover Story
Dan Brown
TechniComm
In July, a solar car racing team from the University of Michigan won
the North American Solar Challenge (NASC) with Continuum, a sun-powered
vehicle that averaged 46 miles per hour over the 2,400 miles from
Plano, Texas, to Calgary, Alberta. It wasn't easy - GPS support
vehicles used real-time simulations from a GNSS survey of the entire
course to give the high-maintenance Continuum good advice - such as
when to get out from under the clouds and back into the
energy-producing sun.
Features
Technical Article
First of three stories about Galileo's new signals in space
Giulano Gatti, Marco Falcone, Valter Alpe, Maktar Malik, Thomas Burger, Manuela Rapisarda
European Space Agency, ESTEC
Elizabeth Rooney
Surrey Satellite Technology Limited
Earlier this year, Galileo’s second experimental satellite reached
orbit and began broadcasting a wide range of signals, including the
first transmissions of the new composite BOC signal on the L1
frequency.
In the first of three stories about Galileo's new signals in space, this article provides an initial report of GIOVE-B
observations performed at the Chilbolton Observatory in the United
Kingdom during May and June 2008.
Technical Article
Second of three stories about Galileo's new signals in space
Andrew Simsky, David Mertens, Jean-Marie Sleewaegen, Wim De Wilde,
Septentrio Satellite Navigation, Belgium
Martin Hollreiser, Massimo Crisci,
ESA/ESTEC, Netherlands
The multiplex binary offset carrier (MBOC) was chosen as the optimal
common open civil signal waveform at the L1 frequency for both GPS and
Galileo, in large part because of its anticipated advantage in
mitigating the effects of multipath (reflected signals). Turns out
those expectations were correct, according to observations made by this
team of researchers.
Technical Article
Third of three stories about Galileo's new signals in space
Christian Tiberius, Hans van der Marel,
Delft University of Technology, The Netherlands
Jean-Marie Sleewaegen, Frank Boon,
Septentrio Satellite Navigation
The prospects are good for carrier phase integer ambiguity resolution
through double differencing signals from the first two Galileo
experimental satellites (GIOVE-A and GIOVE-B), with accuracies at the
millimeter level.
Columns & Editorials
Thinking Aloud
Glen Gibbons
Once again the world is becoming a cauldron of grievances involving its
most powerful nations, including the four primary members of the ICG
Providers Forum.
Human Engineering
Melody Ward Leslie
GNSS Solutions
Mark Petovello with Sam Pullen, Jari Syrjärinne and Lauri Wirola
Experts answer your technical questions about GNSS in this column coordinated by Mark Petovello, University of Calgary.
Working Papers
Opportunities for Using Optical Clocks in GNSS Systems
Alexandre Moudrak, DLR Oberpfaffenhofen, Hugh Klein, UK National Physical Laboratory, and Bernd Eissfeller, University FAF Munich
At its core, the performance of a modern GNSS system depends on the quality of its timing. Galileo’s GIOVE-B satellite is flying the first space-qualified passive hydrogen maser, and active hydrogen masers are part of the ground control segment that will generate Galileo system time. This column discusses the overall timing operation of the current Galileo architecture and points to the possibility of an even more accurate time source for GNSS systems in the future: optical frequency standards.
Reviews
A review of Dr. Paul Groves' new book.
Demoz Gebre-Egziabher
Demoz Gebre-Egziabher reviews Paul D. Groves' new book
A review of Jack K. Holmes' new book
Phillip W. Ward, P.E.
Phillip W. Ward reviews Jack K. Holmes' new book
A review of Alan Bensky's new book
Kyle O’Keefe
Kyle O’Keefe reviews Alan Bensky's new book
News Updates
360 Degrees
Industry View
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