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May 20, 2013

GPS Civil Funding Request Slashed

With just more than four months to go in the 2013 fiscal year, sequestration and furloughs are taking a bite out of key research and the work of the National Coordination Office (NCO) for Space-Based Positioning, Navigation, and Timing (PNT) — the government nexus for GPS-related policy matters.

The NCO is an interagency organization, explained its director, Jan Brecht-Clark in an emailed response; so, “each individual staff member is subject to furloughs implemented by their home agency as a result of sequestration.”

September 19, 2013 - September 20, 2013
Geneva, Switzerland
May 20, 2013

ESA Adds System Time Offset to Galileo Navigation Message

The four Galileo in-orbit validation (IOV) satellites now on orbit have begun broadcasting the “offset” between the GPS and Galileo system time, accurate to a few billionths of a second, according to the European Space Agency.

With satellite navigation based around the highly accurate measurement of signal travel times, both Galileo and GPS have their own internal reference time systems used to synchronize all system clocks, including those in the ground segment, on satellites, and in receivers. Galileo System Time is about 50 nanoseconds or less apart from GPS time.

June 10, 2013 - June 13, 2013
Springfield, Virginia (Washington D.C.)
September 16, 2013 - September 17, 2013
Nashville, Tennessee USA
May 15, 2013

Fourth GPS IIF Satellite Launched

The fourth GPS Block IIF satellite, space vehicle number (SVN) 66, was launched successfully today (May 15, 2013) on board a United Launch Alliance Atlas V rocket at 5:38 p.m. EDT from Cape Canaveral Air Force Station, Florida.

It was the first time that an Atlas V had been used to launch a GPS spacecraft.

May 13, 2013

White House Moves to Harden Infrastructure against GPS Disruption

System engineers across the country may soon be planning, in some cases perhaps for the first time, what they would do if they could not use the GPS service.

The effort is part of an expanded White House initiative to protect the nation’s critical infrastructure. Alhough infrastructure protection programs have been under way for some time, they did not necessarily address GPS vulnerabilities explicitly.

Working Papers • May/June 2013

In-Car GNSS Jammer Localization Using Vehicular Ad-Hoc Networks

Working Papers explore the technical and scientific themes that underpin GNSS programs and applications. This regular column is coordinated by Prof. Dr.-Ing. Günter Hein, head of Europe's Galileo Operations and Evolution.

For the complete story, including figures, graphs, and images, please download the PDF of the article, above.

Inside GNSS • May/June 2013

MUSTER

Existing methods for improving the GNSS performance commonly attempt to enhance the signal processing and navigation estimation parts of a single receiver. Such approaches, however, leave unexplored the potential benefits inherent to the integration of data from multiple receivers.

April 30, 2013

Air Force Examining Broader Options for Next GPS III Satellite Buy

The Air Force will decide this fall whether to build more GPS III satellites or move to a new generation of spacecraft, the leader of Air Force Space Command told Congress last week.

“We’re on contract right now . . . through (GPS III) satellite vehicle number eight. Satellite vehicles nine and beyond – the acquisition strategy for that – will be debated in the fall,” General William Shelton, commander of Air Force Space Command (AFSPC), told the House Armed Services Committee on April 25.

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