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Inside GNSS magazine • Volume 4, Number 6

November/December 2009

Online News, Articles, and Features

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Cover Story

GNSS Milestones

GNSS Leaders Review 2009 and Predict 2010

A new system of systems is arising out of GPS, GLONASS, Galileo, Compass (Beidou-2), QZSS, GAGAN, IRNSS, EGNOS, WAAS, MSAS and undoubtedly other acronyms yet to be born.  As 2009 turns into 2010, we asked a select group of GNSS leaders to comment on the progress of the systems and their augmentations over the past year as well as the prospects for the year ahead.

Feature

The Top Ten in PNT

National Space Competitiveness

Not all space-based PNT providers can
count on supportive government policies,
generous funding, abundant skilled technicians, or a strong national economy to advance their GNSS system. So who is in the top 10? Analysts from a noted market intelligence firm rank the current and projected capabilities of the world’s GNSS system operators.

Article
Technical Article

Timing on the Fly

Synchronization for Direct Georeferencing on Small UAVs

Meet the Burredo — an inexpensive,
lightweight sub-microsecond timing system
for synchronizing the position and attitude
of an unmanned aerial vehicle’s camera at the moment of exposure.

Columns & Editorials
Thinking Aloud

The Golden Age of GNSS

Will the coming year mark the beginning of the Golden Age of GNSS? At first glance, such a notion might seem not just optimistic, but noticeably ill timed. Read further, however, and you’ll see a broad-spectrum list of events likely to occur in 2010 that could prove the best is still to come.

Working Papers

Coherent Integration Time

The Longer, the Better

Data bit transitions, oscillator jitter, and user dynamics prevent coherent integration time in a GNSS receiver for more than a few dozen milliseconds. But increasing this to several seconds would help solve three problems in a degraded signal environment: multipath, cross-correlation false locks, and the squaring loss. The authors introduce a highly-sensitive prototype that may solve these issues.

GNSS Solutions

Why is it so difficult to launch a spaceborne GNSS receiver?

GNSS Hotspots

GNSS Hotspots

GNSS data points and factoids to amuse and inform.

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