March/April 2010

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Researchers at Seoul National University have developed a low-cost automatic flight control system for an unmanned aerial vehicle based on a single-antenna GPS receiver.

This Spanish engineer’s work combines signal design with international diplomacy to make sure the GNSSes all get along.

Real-time corrections at the decimeter level over an entire continent? The challenge lies in minimizing the ranging errors from signals propagating through the Earth’s atmosphere. European researchers describe how it can be done using a Wide Area Real-Time Kinematic concept.

The Volpe report came out on the day before 9/11/01. Now we’ve blown through another nine years without really addressing the issue. And if Volpe repeated its study today, only assessing the effects of the vulnerability of the world’s timing infrastructure as well as transportation . . . well, no one really wants to think about that. And so nothing has really been done about it.

What leads to delays in a receiver’s initial position fix and how do you estimate  the TTFF for different GNSS signals and receiver start conditions? Includes detailed simulation results for GPS and Galileo signals.

GNSS data points and factoids to amuse and inform

Raytheon's investment in its Aurora operation, with its architecture and system-integration engineering focus, has paid off. But coordination of ground control and GPSIII satellite development efforts still has to be refined.

Several aspects of Gruber’s background suggest that a change in perspective and style could accompany his tenure at the key acquisition organization for the U.S. Global Positioning System.