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Inside GNSS magazine • Volume 4, Number 1

January/February 2009

Online News, Articles, and Features

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GPS & Regime Change, Part 2

What Lies Ahead

The massive turnover that occcurs when the United States executive branch moves from the hands one political party to another will see the departure of many officials with GPS expertise. Who will fill the gap and what will that mean for the nation’s premier space-based positioning, navigation, and timing program?

GNSS World

ICG-3: Friendly Persuasion

Clashing trajectories pressure GNSS providers - but growing commercial markets inspire a search for compatibility at the third plenary meeting of the International Committee on GNSS.

Technical Article

Autonomous Integrity

An Error Isotropy–Based Approach for Multiple Fault Conditions

A new technique for computing protection levels in “liability critical” applications — those in which large undetected GNSS position errors can have severe legal or economic consequences.

Technical Article

QZSS's Indoor Messaging System

GNSS Friend or Foe?

The IMES positioning and communications system developed as part of Japan’s Quasi-Zenith Satellite System may be the perfect answer for “seamless” ubiquitous positioning — or perhaps a jamming threat to the integrity of GPS.

Columns & Editorials
Thinking Aloud

Critical Infrastructure: The United States and GPS

So, President Obama wants to spend some money on infrastructure, eh? Well, here’s an idea: send some of it GPS’s way.

Working Papers

GNSS in Space, Part 2: Formation Flying Radio Frequency Techniques and Technology

The idea of flying two or more satellites in controlled formations with
complementary sensors on board to execute scientific research missions
will receive a lot of practical attention in the near future. In some cases, GNSS signals will be used to meet the
high-precision positioning and orientation requirements for this
application. Other, higher-orbit missions will employ RF-based
techniques similar to those used to make GNSS carrier phase
measurements. The second and final part of the series describes the technologies and techniques used in this scientific

GNSS Solutions

What about GPS jamming and maritime safety, and linear carrier phase combinations?

GNSS Hotspots

GNSS Hotspots

GNSS data points and factoids to amuse and inform

Sibling Rivalry at ICG, Gas Tax Wars in Oregon, What Next in Washington D.C., and The Gift of the Magi

360 Degrees
Industry View
New Products
122 • GNSS Receivers

u-blox 1.8-Volt GPS Module

123 • GNSS Receivers

Dual-Frequency RTK GPS Receiver

124 • GNSS-Related Hardware

RF Noise Canceller for GPS

125 • Antennas

GPS Quadrifilar Antenna

Jammer Dectector
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