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Service and Security

I have had many occasions to reflect on the unfortunate timing of the release of the Volpe Transportation Center report, “Vulnerability Assessment of the Transportation Infrastructure Relying on the Global Positioning System.”

Just to refresh our memories, the Volpe report came out on Monday, September 10, 2001.

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February 16, 2010

GNSS Hotspots | February 2010

1. CHECK THE “ON” SWITCH
Grand Portage Reservation, Minnesota USA
Grand Portage reservation biologists collared eight moose with $5,000 GPS trackers that noted location, air temperature, and movement. A glitch turned the devices off. Helicopters found the herd via radio telemetry, netted and hobbled them so that researchers could flip the switch. Biologists, the GPS manufacturer, and the moose all survived the ordeal.

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By Inside GNSS

How Is Solar Activity Predicted and How Can Predictions Be Used With GNSS?

Q: How is solar activity predicted and how can predictions be used with GNSS?

A: Irregularities and turbulence in the ionosphere cause the largest errors imposed on GNSS applications. The ionosphere is created by the constant electromagnetic emissions from the Sun, and the largest disturbances in the ionosphere follow solar eruptions — flares and coronal mass ejections (CMEs).

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