The Business and Technology of Global Positioning, Navigation, and Timing

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Read the Digital Issue: GPS World, April 2009

THE SYSTEM 10
Big Four Race Called from Munich; DAGR Extended; Jamming Trial Confirms Vulnerabilities; Briefly Noted

THE BUSINESS 14
Security Paramount, Strengthened by Location; Broadcom, SiRF Top ABI’s GPS Chip Vendor Ranking; ITT Awards Symmetricom Timing Contract for GPS III; more

BUSINESS
OUTLOOK 27
How the Stimulus Plan Benefits Our Industry How will the American Recovery and Reinvestment Act of 2009 affect our industry?
By Stephen Colwell

SBAS Interference 37
Worst-Case Scenario
Some applications using data collected by fixed- or low-dynamic WAAS or other SBAS receivers may encounter a tracking error due to C/A code cross-correlation.
By L. Lestarquit, J-L. Issler, O. Nouvel, M. Sihrener, G. Lamontagne, J.C. Guay, R. Landry, O. Julien, C. Macabiau, and M. Nouvel-Malicorne

Precise Point Positioning 43
A Powerful Technique with a Promising Future
Is there a viable alternative to real-time kinematic (RTK) positioning? In this month’s column, we take a look at the technique of precise point positioning (PPP). How close is PPP to prime time?
By Sunil Bisnath and Yang Gao

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COVER STORY
Positioning for Driver Assistance
Communication on the Road
A low-cost GPS-based positioning architecture for V2V and V2I systems uses a scalable, flexible system with over-the-air messaging and an onboard design to enable a range of in-vehicle safety features.

Vehicle-to-vehicle (V2V) communication-based advanced driver assistance systems (ADAS) enable or enhance a suite of safety features by combining GPS and short-range wireless communication. The allocation of the 5.9 MHz radio spectrum for highway safety and traffic efficiency applications using Dedicated Short Range Communications (DSRC) has given automotive manufacturers the ability to go beyond traditional sensor-based safety features to provide drivers with another sense. DSRC enables vehicles to talk to surrounding vehicles and maintain a comprehensive situational awareness of roadway traffic. ...

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