GPS World, August 2013
August 2013 VOL 24 NUMBER 8 gpsworld com COVER STORY AUTONOMOUS NAVIGATION Robot Target on Its Back 30 Two Autonomous Vehicles Seek Safe Avoidance in Critical Tests A new state of the art research center runs car makers safety systems through their paces in tandem with a soft target robot that can be crash impacted without adverse effects Precise positioning and exact repeatability of test sequences are key criteria By Paul Perrone Cover and article photos by Brian J Geiger OPINIONS DEPARTMENTS GOVERNMENT Out in Front 6 A Star Is Born By Alan Cameron EXPERT ADVICE The Chip Scale Combinatorial Atomic Navigator 8 By Andrei Shkel THE SYSTEM 12 IRNSS Success GLONASS Bellyflop CNAV Live Broadcast THE BUSINESS 16 Microdrone Navigates over Alps with u blox GPS ESA Selects Averna for Galileo Trimble Expands Spatial Imaging Portfolio Topcon Offers HiPer SR Integrated Receiver for GIS Mapping Two Products Added to NovAtels OEM6 Line Garmin Launches a Portable Head up Display Northrop to Provide Improved GPSChallenged Navigation to Air Force Events PRODUCT SHOWCASE 29 GNSS and Radio Astronomical Observations 34 An alternative tool for detecting underground nuclear explosions Well concealed underground nuclear explosions may go undetected by International Monitoring System sensors An independent technique of detection and verification may be offered by GPS based analysis of local traveling ionospheric disturbances excited by an explosion Most of the work to date has been at the research demonstration stage however operational capability is possible based on the worldwide GPS network of permanently tracking receivers This article discusses a case study of detecting underground nuclear explosions using observations from GPS tracking stations and the Very Large Array radio telescope in New Mexico By Dorota A Grejner Brzezinska Jihye Park Joseph Helmboldt Ralph R B von Frese Thomas Wilson and Jade Morton SECURITY SURVEILLANCE Automatic Threat Assessment 45 Tracking System Tells Friend from Foe By Eric Olson and Steven Pisciotta THE ALMANAC Orbit Data and Resources on Active GNSS Satellites 47 www gpsworld com August 2013 GPS World 3
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