GPS World, February 2012
February 2012 VOL 23 NUMBER 2 gpsworld com COVER STORY WIRELESS Shadow Matching 14 Improved GNSS Accuracy in Urban Canyons GNSS positioning in dense urban areas is unreliable Shadow matching uses 3D building models to predict which satellites are visible from different locations and compares this with the measured satellite visibility to determine position Presented are test results of a preliminary shadow matching algorithm in a London urban canyon and discussion of practical implementation By Paul D Groves Lei Wang and Marek K Ziebart OPINIONS DEPARTMENTS ONLINE RESOURCES SURVEY SCENE Should GPS Users Accept New Fees By Gavin M Schrock DEFENSE PNT Where Am I By Don Jewell LBS INSIDER CES Turning into Big Tech Auto Show By Kevin Dennehy WIRELESS PULSE Location Technology All in the Cars By Janice Partyka PRECISION OEM Airborne Receivers How Hard Can It Be By Tony Murfin GNSS DESIGN TEST Lets Hear It for the Supremes By Alan Cameron ALL NEWSLETTER COLUMNS AVAILABLE AT www gpsworld com editorials MARCH WEBINAR Out in Front 4 When the Gavel Comes Down By Alan Cameron Expert Advice 6 Location Context Relevance for Revenue By Christopher Peralta Getting to Accurate Everywhere Location By Brock Butler THE SYSTEM 9 THE BUSINESS 12 SPECIAL SECTION GNSS Antenna Survey 31 The only authoritative industry resource for GPS GNSS antenna manufacturing ARTICLES Patch Antennas for the New GNSS 52 Better Reception in a Changing World New receivers track many satellites and constellations How to use a single antenna for all these signals By Gyles Panther INNOVATION GNSS Antennas and Humans 60 A Study of Their Interactions By Jared B Bancroft Valérie Renaudin Aiden Morrison and Gérard Lachapelle SURVEY GIS Everything Else but GPS How GLONASS Galileo and Compass Will Affect High Precision Users Speaker Eric Gakstatter GPS World contributing editor for Survey and GIS March 15 Mark your calendar today Visit gpsworld com webinar to register for upcoming webinars Also download past webinars free www gpsworld com February 2012 GPS World 3
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