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Inside GNSS magazine • Volume 7 Number 5

September/October 2012

Online News, Articles, and Features

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Cover Story

Spoofs, Proofs & Jamming

Towards a Sound National Policy for Civil Location and Time Assurance

Incidents of GNSS interference and jamming are increasing in the United States. Successful spoofing of civil GPS signals has been demonstrated.
What risks do these pose for companies and individuals using or relying on space-based positioning, navigation, and timing? A signals and waveform expert sizes up the problem and proposes some solutions.

Article
Technical Article

Improving GNSS Attitude Determination

Using Inertial and Magnetic Field Sensors

Determination of horizontal attitude poses a general problem for navigation applications, especially those using small aerial platforms and requiring low-cost solutions. A team of German engineers are exploring a method that combines accelerometers, gyroscopes, and a magnetic field sensor with a GNSS compass to provide a multi-sensor attitude system for portable, small-sized launcher applications. Promising results include bridging GNSS dropouts as well as enhanced integrity monitoring.

Columns & Editorials
Thinking Aloud

Fractured GNSS Fairy Tales

What’s not to like about GPS?

It’s free, it’s worked great — without
failure, really — for nearly 20 years, and it has delivered to the
world’s citizens an affordable, accurate, and widely available
capability for precise location and timing unprecedented in human
history.

Washington View

GPS Civil Funding

The Check is in the Mail

Not only have the GPS civil program funds been held up for months, but
when the promised amount finally arrives, it will —again— be far short
of what was budgeted.

Human Engineering

Genene Fisher's Compass Points

Human Engineering

Genene Fisher: Bringing Space Science Down to Earth

If we were to think of the GNSS enterprise as a ship sailing the
high seas of space, then space weather expert Genene Fisher would be up in the
crow’s nest, on the lookout for asteroids instead of icebergs.

Working Papers

Exploiting the Galileo E5 Wideband Signal

for Improved Single-Frequency Precise Positioning

Single-frequency positioning can undoubtedly be improved with the deployment of new GNSS systems and the accompanying availability of new signals. Among various innovations, the Galileo E5 broadband signal deserves special attention. This article demonstrates the expected performance of E5 for selected land applications and precise orbit determination of low Earth orbiting satellites.

GNSS Solutions

Vector Delay Lock Loops

How do vector delay lock loops predict the satellite signals?
GNSS Hotspots

GNSS Hotspots

GNSS Data Points and Factoids to Amuse and Inform

In this issue: Third GPS IIF, Galileo on a roll, how to get away in the UK, Scottish toilets and property lines in India.

Thought Leadership Series

GNSS Augmentations

When a Signal in Space Isn’t Enough

Five to ten meters might seem like pretty good real-time accuracy. But not when you’re landing an airplane or guiding a farm vehicle through a field.

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