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Inside GNSS • September/October 2007

What’s Going On? RFI Situational Awareness in GNSS Receivers

In-band radio frequency interference (RFI) is a serious threat to the reliable operation of GNSS receivers. When the RFI power level is high enough to render the GNSS receiver inoperable, usually no visible external signs appear indicating that anything is out of order; so, the user initially assumes the receiver has experienced an internal failure.

Working Papers • September/October 2007

Authenticating GNSS: Proofs against Spoofs, Part 2

The emergence of a multi-GNSS world will inevitably require the civil GNSS user community to address the issue of signal authentication: confirming that a pretended identity of a user or transmitted information is, in fact, real and correct.

This two-part column focuses on the concepts and methods for achieving authentication in GNSS operations. In the July/August issue, the column began by introducing some of the cryptographic concepts, terminology, and techniques used to develop and implement authentication methods in navigation systems in general.

Inside GNSS • July/August 2007

GPS + GLONASS for Precision

The SC Geodetic Survey (SCGS) has combined the technologies of the GPS, GLONASS, cellular communications and high-speed server networks to provide centimeter-level accuracy in real-time for surveying, mapping, and engineering applications.

Working Papers • July/August 2007

Authenticating GNSS: Proofs against Spoofs, Part 1

Authentication is an essential problem in the field of communication: confirming that a pretended identity of a user or transmitted information does, in fact, really correspond to the true identity or source.

Inside GNSS • May/June 2007

Opening the GATE

Nestled amid the slopes and valleys of southeastern Germany’s precipitous Alps, a novel installation has taken form over the past three years that will allow receiver designers and application developers to have real-world experience with Galileo signals years before Europe’s GNSS becomes operational.

Human Engineering • May/June 2007

Ruth Neilan: The Global Grid Master

When Ruth Neilan was named director of what is now known as the Central Bureau of the International GNSS Service (IGS), she had an immense undertaking before her.

A voluntary civilian federation, the IGS compiles and analyzes GPS (and more recently, GLONASS) satellite data. From these, the IGS creates highly accurate products —such as precise satellite orbit and clock files — and makes them freely available to engineers, scientists, and researchers all over the world.

Inside GNSS • March/April 2007

More Perils for Galileo . . . and Other GNSS Dramas

A convergence of developments over the past few months has brought Europe’s Galileo program to the most critical passage of its history — at least, since final approval of the GNSS initiative by the European Space Agency (ESA) and the European Union (EU) in 2003 and 2004, respectively.

Inside GNSS • March/April 2007

Replenishment of the GLONASS Constellation

In 2006, the 10-year Russian Federal program to replenish and modernize the navigation system GLONASS was updated with the aim to quickly complete the satellite constellation and make it available to domestic and foreign users.

On December 25, 2006, from the Baikonour launch site, three modernized satellites, GLONASS-M, were placed into orbit by a single launch vehicle.

Ventures • January 31, 2007

NordNav, CPS Purchase to Support Mobile Phone Effort

BlueTooth technology provider CSR, of Cambridge, United Kingdom, has acquired NordNav Technologies AB, of Sweden, and Cambridge Positioning Systems Ltd. (CPS) of also of Cambridge, UK. Taken together, the acquisitions will allow the company to provide software-based low-cost GPS suitable for mass-market mobile phones and Personal Navigation Devices (PNDs).

New Builds • January 31, 2007

RTK Precise Positioning

Calgary, Alberta, Canada’s NovAtel Inc. offers a new real-time kinematic (RTK) positioning solution, known as AdVance RTK, designed to enhance the precision and performance of the company’s OEMV family of GNSS receiver boards.

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Trimble
Jammer Dectector
Sensonor
Spectracom
CAST
NovAtel
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