GPS and Alaska Rail Safety Mar 1, 2004 By:
Andrew J. Schiestl
This article describes recent implementation of the first phases of a collision avoidance system (CAS), based primarily on real-time GPS positioning and VHF data radio communications.
For applications with a high-reliability requirement, GNSS fails in urban, indoor and other locations lacking a direct line-of-sight to the satellites. A new technique employs hybrid receivers adding the good repeatable accuracy as well as the strong penetration power of low-frequency Loran-C signals and other terrestrial navigation systems. This offers significant advantages to many road and rail applications, especially those with high safety and security requirements. Dec 1, 2001 By:
Durk van Willigen, Jorg Pfister, Dieter Meinhard, Martin Maurer, Klaus Legat, Jurgen Beyer, Gunther Abwerzger
A lack of reliable positioning signals confronts many promising service ideas
