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Inside GNSS • April 2006

ICG Working Group Takes On Issues

An ad hoc working group has begun sorting through issues surrounding the recent formation of the International Committee on GNSS (ICG).

Inside GNSS • April 2006

GLONASS: Picking Up the Pace

Russian officials are working to develop a plan that will meet Russian President Vladimir Putin’s directive to have the full GLONASS constellation in place by 2009 instead of 2011.

Inside GNSS • April 2006

Galileo: the Concession Merry-Go-Round

Risk allocation, avoidance, and management are the watchwords of the day as the contract negotiation for the Galileo concession moves into its endgame.

GNSS Solutions • April 2006

Adaptive Antenna Arrays, Multi-GNSS Tropospheric Monitoring, and High-Dynamic Receivers

Q: What is adaptive nulling vs. adaptive beamforming? What are the advantages and disadvantages?

A: Adaptive arrays are perhaps the single most powerful antijamming tool in the GNSS systems engineer’s toolkit. They can provide anywhere from 15 to 90 dB of jamming rejection depending on the specific architecture used. Their main disadvantage is that they require an array of antenna elements, each spaced about four inches apart (center to center), and thus are physically large.

GNSS Solutions • March 2006

Carrier Phase Ambiguity Resolution, GNSS Use In Cellular Telephone Systems, and New Antennas?

Q: Will I need a new antenna for the new GPS and Galileo signals? Will one antenna work for both systems?

A: To answer these questions, information will be presented on the GPS and Galileo signal formats, some antenna basic fundamentals with various user applications in mind, followed by some predicted performance assessment.

Inside GNSS • January/February 2006

New EC DG-TREN Director-General

Matthias Ruete has been named as director-general of the European Commission’s Directorate- General for Energy and Transport (EC DG-TREN), which has overall responsibility for implementation of the Galileo program on behalf of the European Union (EU). He replaces François Lamoreaux.

Inside GNSS • January/February 2006

GPS L2C is on the air

Civil GPS users now have a second full signal available to them — albeit on only one satellite and “at the user’s own risk” — courtesy of the first modernized Block IIR (IIR- 14M) spacecraft launched last September. And the world’s geodetic community is already moving to take advantage of it with announcement of an addendum to the receiver autonomous exchange (RINEX) format used to combine high-precision position data from different types of GPS receivers.

Inside GNSS • January/February 2006

First Galileo Satellite Begins Broadcasts

European Space Agency (ESA) and Surrey Satellite Technology Ltd.(SSTL) operators have completed the on-orbit preparations and activated the navigation payload for GIOVE-A, the first Galileo satellite launched December 28.

GNSS Solutions • January/February 2006

Reference Systems, UTC Leap Second, and L2C Receivers?

Q: Will the new L2C signals be able to be tracked by existing L2-capable (civilian) receivers?

Inside GNSS • January/February 2006

GNSS Trilogy 2006

Oops! Wait a minute! Hold your horses there, Homer; it’s not that Odyssey. We’re talking about the GNSS odyssey.

More than 30 years in the making, not a mere decade. And its heroes didn’t simply drift idly about the wine-dark Mediterranean enjoying the rosy-fingered dawn like Odysseus and his buddies. The GNSS crew — GPS, GLONASS, and now Galileo — has traveled from California to Colorado to Brussels, Moscow, India, Kazakhstan, Beijing, Tokyo, and beyond!

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