Field Testing of a Pedestrian Alert System
May 1, 2008
By:
Charles Rodgers, Richard Blomberg
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A pedestrian alert system can help reduce deaths and injuries caused by vehicle collisions with pedestrians, and could be adapted for bicycle safety, airport-ramp and construction-site pedestrian safety.
How Far Have We Come?
Apr 1, 2008
By:
Andreas Wieser
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To reduce road-maintenance costs, some administrations are charging per kilometer of travel with data coming from an odometer recording. To fairly implement such schemes, accurate odometers are critical. Could an odometer based on GNSS be a solution?
Real-time Mapping in Autonomous Vehicles
Oct 1, 2007
By:
Umit Ozguner, Keith A. Redmill, Charles Toth, Dorota A. Grejner-Brzezinska
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DARPA's upcoming Urban Challenge will showcase capabilities for effective real-time mapping by robotic vehicles requiring sophisticated sensing capabilities to cope with the object-rich urban setting, where moving objects will also be present.
Jun 1, 2007
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Chet Huber, president of OnStar, a wholly owned subsidiary of General Motors that provides in-vehicle telematics to five million subscribers, spoke with GPS World on May 7.
Dynamic Road Prediction for Safe Overtaking
Apr 1, 2007
By:
Jan Loewenau
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A new driver assistance system indicates road sections that are unsafe for passing. The advanced navigation system extends the visual horizon to an electronic horizon with a much larger range.
GPS Drives Vehicle Infrastructure Integration
Oct 1, 2006
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Integration of GPS and wireless high-speed communications in vehicle-to-vehicle and vehicle-to-roadside links can reduce accident rates and injuries. A sophisticated processor, GPS receiver, and dedicated short-range communications (DSRC) transceiver tap into available sensors that already help to control and maintain vehicle operations.
Position and Orientation Data for Autonomous Navigation
Sep 1, 2006
By:
William "Red" Whittaker, Louis Nastro
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Preplanning information about terrain is as important as real-time navigation for achieving peak performance in autonomous driving. Both preplanning and navigation — and key technologies to support them — helped the Carnegie Mellon Red Team successfully guide the robot vehicles Sandstorm and H1ghlander through the 2005 DARPA Grand Challenge course.
Emerging applications in the U.S. Department of Transportation's (DOT's) ambitious Vehicle Infrastructure Integration (VII) initiative include integrations of GPS with Dedicated Short Range Communications (DSRC) and other sensor technologies to improve highway safety and efficiency.
Aug 1, 2006
By:
Mario Proietti, Justin McNew
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Emerging applications in the U.S. Department of Transportation's (DOT's) ambitious Vehicle Infrastructure Integration (VII) initiative include integrations of GPS with Dedicated Short Range Communications (DSRC) and other sensor technologies to improve highway safety and efficiency.
Performance Analysis of an Integrated Tracking System
Jul 1, 2006
By:
James Carroll
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Before GPS, even before satellites, there was LOng RAnge Navigation, or LORAN. Using terrestrial radio transmitters, it was developed during World War II for aircraft navigation. The wartime system evolved by the mid-1950s into the present day 100 kHz LORAN-C system. LORAN's standard principle of operation is hyperbolic positioning. A receiver measures the difference in times of arrival of pulses transmitted by a chain of three to six synchronized stations separated by hundreds of kilometers. The time-difference measurement derived from the signals of two stations, when multiplied by the speed of propagation of the signals, forms a line of position (LOP); the receiver could be anywhere on this line and give the same measurement. The geometrical form of this LOP is a hyperbola. Measurements using a third station provide another hyperbola, which intersects the first at the position of the receiver. There are many LORAN chains around the globe.
