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Inside GNSS magazine • Volume 1, Number 7

October 2006

Online News, Articles, and Features

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Cover Story

Setting a New Standard: Assisting GNSS Receivers That Use Wireless Networks

Receiver manufacturers and mobile phone designers face a plethora of wireless and GNSS standards in their efforts to build user equipment that employs telecommunciations networks to improve positioning accuracy and speed. As a result, telecom engineers are proposing a single, common standard for A-GNSS.

Feature

GNSS Forum: This is Not a Test - Future of the Emergency Alert System

Born in the era of fallout shelters and school air-raid drills, the U.S. Emergency Broadcast System punctuated the anxieties of a Cold War. This commentary explores how that system lives on today and how a growing need for location information during emergencies  might be met by combining GNSS with mobile communications.

Articles
Technical Article

Correlators for L2C

Some Considerations

With the launch of the first modernized GPS Block IIR satellite in September 2006, GNSS product designers have an additional, fully open signal to use in their work: L2C. But the new signal also has different parameters than the L1 C/A-code signal available for the last 30 years. What does that mean to the people who are designing the correlators for new generations of GNSS receivers?

Technical Article

Making the Case for GBAS: Experimental Aircraft Approaches in Germany

Several satellite-based augmentation systems for improving GNSS accuracy and integrity to assist aircraft approach and landings are well under way around the world. Their ground-based counterparts (GBAS) are also being developed. As this article reveals, Braunschweig, Germany, is becoming one of the focal points for GBAS activities in Europe.

Columns & Editorials
GNSS Solutions

A New Version of the RTCM SC-106 Standard, the Probability of Solving Integer Ambiguities

Thinking Aloud

A System of Systems

Hope on the horizon for GNSS interoperability

Robustness, redundancy, availability, interoperability. Like FM radio, these are the qualities that make a GNSS system of systems such a desirable goal — for GNSS product manufacturers and location services providers, for end users, and for the nations building critical infrastructures and national security policies on space-based positioning, navigation, and time.

Working Papers

Interpolating Reference Data: Kinematic Positioning Using Public GNSS Networks

High-accuracy users of public GNSS reference archives don’t always have access to data that matches the high sampling frequencies needed for real-time kinematic techniques. This column proposes a method for interpolating GNSS observation residuals so as to produce data that can be used in kinematic applications.

360 Degrees
New Products
53 • GNSS Simulators

Spirent GSS7700 GPS simulator

54 • GNSS Simulators

CAST Navigation CAST-4000

Signals
Trimble
Trimble
Jammer Dectector
Sensonor
Spectracom
CAST
NovAtel
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