GPS

January 1, 2018

What is navigation message authentication?

Q: What is navigation message authentication?  

A: As of today, all open civil GNSS signals are transmitted in the clear, conforming to interface specifications that are fully available in the public domain. Receivers will accept any input that conforms to the specifications and treat it as if it came from a GNSS satellite. Combined with the extremely low power levels of GNSS signals this makes it almost trivially simple to spoof a GNSS receiver.

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By Inside GNSS
December 21, 2017

Once again, GPS to Help NORAD Track Santa Claus’ Journey

This is a very exciting and anxious time of year for boys and girls as they await the arrival of Santa Claus and his bag of toys. Fortunately, for those who need to know exactly when to expect this wonderful arrival, the North American Aerospace Defense Command (NORAD) tracks Santa each year during the holiday season, using satellite systems and high-powered radars to deliver the Santa Tracker.

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By Inside GNSS
December 18, 2017

GPS III RFP Delayed Again as GAO Underscores GPS Schedule Challenges

An additional delay in release of the GPS III RFP emerged just as federal watchdogs released a new report detailing the challenges Air Fore managers will face in keeping all the components of the modernization program on track.

The long-expected report from the Government Accountability Office looks at the overall effort to update GPS including developing a new ground system, more capable receiver cards for military equipment and new satellites to sustain and improve the constellation.

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By Inside GNSS
November 27, 2017

Ligado: Business and Network Plan Remain Unclear

A highly anticipated presentation by Ligado Networks to the nation’s leading satellite navigation experts took an unexpected turn when the company said it could not provide essential network information because it was looking to the government for technical direction and its business plans were still in flux.

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By Dee Ann Divis