July/August 2008 Editorial Preview

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COVER STORY
Getting On The Same Page
AGNSS Standardization for Location-Based Services
Michel Monnerat, Thales Alenia Space
Technology, standards, and business models are the three-legged stool of GNSS market development. In the case of consumer LBS, technology development has to include compatible, interoperable GNSS systems, telecom-network–based assistance capability, and evolving mobile-device functionality. This means that more signal resources must be incorporated into common data formats and message protocols — in a word: standardization. The author is the leader for assisted GNSS (AGNSS) developments at TAS in Toulouse, France.

TECHNICAL ARTICLES
Jammin'
Field-Testing Ways to Avoid GPS Vulnerability
Paul Benshoof, 746th Test Squadron with the JAMFEST team
Find out how JAMFEST exercise organizers create realistic jamming environments in multiple configurations to test and train participants in handling a GPS-challenged environment. The latest in this series of Department of Defense exercises will take place at White Sands Missile Range next fall.

Not by GNSS Alone
An FPGA-Based GPS/INS Integrated System
Yong Li, Peter Mumford, and Chris Rizos; University of New South Wales
Like the legendary cities of Shangri-la and Cibola, seamless navigation remains elusive. Land applications — which must navigate urban canyons, highway tunnels, and forests — are most likely to suffer from GPS outages. But system developers continue to explore a potential solution in GNSS integration with inertial sensors. This article describes development of a low-cost GPS/INS integrated system based on a field programmable gate array (FPGA) platform.

COLUMNS

WORKING PAPERS
Fighting the Fading, Part III
Günter Hein, Andreas Teuber; University FAF Munich
Hans-Jörg Thierfelder, Anne Wolfe; Dresden University of Technology
In this third and final part of a series, the authors describe a new approach to model the behavior of signals propagating indoors. The results and analysis of field experiments using actual transmitted Galileo L1 and L5 signals are presented.
Part I
Part II

GNSS SOLUTIONS
You ask - they answer. Mark Petovello of the University of Calgary finds the experts who can solve your GNSS mysteries, questions, and conundrums. GNSS Solutions home page: http://www.insidegnss.com/solutions

What is the second order ionosphere error and what are its characteristics? Answer by Jade Morton, Miami University
What are the key issues associated with multiple reference station GNSS networks? Answer by Paul Alves, Leica Geosystems

HUMAN ENGINEERING

The Timekeeper
Ron Beard, master of the U. S. Naval Research Lab's GPS clock development, is the subject of this issue's engineering profile.
Human Engineering home page: http://www.insidegnss.com/humanengineering

REVIEW
Inside GNSS will feature reviews of new GNSS books in the summer and fall issues, including:
Spread Spectrum Systems for GNSS and Wireless Communications, by Jack K. Holmes
Reviewed by Phil Ward
Principles of GNSS, Inertial, and Multisensor Integrated Navigation Systems, by Paul D. Groves
Reviewed by Demoz Gebre-Egziabher
Wireless Positioning: Technologies and Applications, by Alan Bensky
Reviewed by Kyle O’Keefe