Inside GNSS: Engineering Solutions from the Global Navigation Satellite System Community
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GNSS Solutions • September/October 2012

Vector Delay Lock Loops

GNSS receivers determine their position and clock bias by measuring the arrival times of satellite signals. Delay lock loops (DLLs) are used in traditional receivers to measure the arrival times of the signals.

Inside GNSS • September/October 2012

GPS Civil Funding

The Federal Aviation Administration (FAA) has told those awaiting their slice of the GPS civil program budget that the funds are on the way.

The money, which is supposed to support that portion of the GPS program springing from the needs of civilian users, has been held up for months. In fact, as of late August — with less than 40 days left to go in the fiscal year — the money had not been transferred to either the military’s GPS Directorate or the National Coordination Office (NCO) for Space-Based Positioning, Navigation, and Timing (PNT).

Human Engineering • September/October 2012

Genene Fisher: Bringing Space Science Down to Earth

SIDEBAR: Genene Fisher's Compass Points

As Solar Cycle 24 rolls around toward its maximum peak next May, when a hundred or more sunspots may appear during the course of a single day, no single navigator stands at the helm to guide the hundreds of companies, research groups, users, and policy workers through the uncharted realm of spiking solar activity and its inevitable effects on GNSS.

Inside GNSS • September/October 2012

Improving GNSS Attitude Determination

This article describes an integration of a single-frequency GNSS, two-antenna heading system with low-cost inertial and magnetic field sensors in order to improve the availability and reliability of pure GNSS attitude determination. This method calculates a redundant attitude solution in an error-state Kalman filter using different sensor setups. As a result, the process of carrier phase ambiguity resolution accelerates.

Inside GNSS • September/October 2012

Spoofs, Proofs & Jamming

“Here is Edward Bear, coming downstairs now, bump, bump, bump, on the back of his head, behind Christopher Robin. It is, as far as he knows, the only way of coming downstairs, but sometimes he feels that there really is another way, if only he could stop bumping for a moment and think of it. And then he feels that perhaps there isn’t.”
- A.A. Milne, Winnie-the-Pooh

Is our faith in the integrity and infallibility of the Global Positioning System misplaced or, perhaps, insufficiently grounded?

October 15, 2012 - October 17, 2012
Madrid, Spain
November 26, 2012 - November 29, 2012
Reston, Virginia USA
Events • August 31, 2012

ION's Big Year! GNSS 2012 Plus a New Pacific Rim Conference

It's a big year for the Institute of Navigation, with the venerable ION GNSS 2012 happening this September in Nashville and the new and highly anticipated Pacific PNT conference opening for the first time next April in Honolulu.

ION GNSS 2012, the granddaddy of all GNSS events, begins shortly in Music City, USA: Nashville, Tennessee.

It's scheduled during the third week of September at the downtown Nashville Convention Center, a five minute walk to the Country Music Hall of Fame and other attractions.

August 31, 2012

U.S. Officials Explore Use of the EU's Galileo Secure Civil Signal

The United States and the European Union are talking about how U.S. agencies might use the secure signal planned for Galileo to better fulfill their various responsibilities.

September 20, 2012
Nashville, Tennessee
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