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Inside GNSS magazine • Volume 6 Number 1

January/February 2011

Online News, Articles, and Features

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GNSS World

GNSS Interoperability

Not So Easy, After All

Interoperability. How do we turn fiercely independent GNSSes into a system of systems that is more than the sum of its parts? Unilateral? Bilateral? Multilateral? And where do we make it happen — out in space, on the ground, in the receiver?

Articles
Technical Article

A Model-Based Approach

To Signal-in-Space Specifications for Designing GNSS Receivers

The authors present a preliminary study on the possible application of Interface Communication Modelling Language (ICML) to the Galileo Open Service signal-in-space interface specification.

Technical Article

Indian Regional Navigation Satellite System

Correction Parameters for Timing Group Delays

India is developing a regional navigation satellite system that will broadcast GNSS signals, with the first satellite scheduled for launch next year. The IRNSS signals will contain data to account for several sources of error, including a lesser-known one deriving from within a spacecraft itself: the hardware delay of the signal from its generation to radiation from the satellite antenna.

Technical Article

Spectrum-Compact Signals

A Suitable Option for Future GNSS

With the growing number of GNSS satellites on orbit, out-of-band emissions and in-band RF noise also increase, raising issues of signal compatibility. One solution might be to use more spectrum-efficient signal structures. In this article, the authors explore the use of minimum shift keying as an alternative to current GNSS signal designs.

Columns & Editorials
Working Papers

Wavelets and Notch Filtering

Innovative Digital Processing Techniques for Mitigating RF Interference

As interest in GNSS for safety critical applications gains momentum, interference concerns abound. Pulsed interference and continuous wave signals can degrade signal reception. The authors present emerging concepts for detecting and mitigating interference by means of digital processing techniques applied in the receiver.

Thinking Aloud

Your Signal Is My Noise

Raising questions of GNSS compatibility and interoperability

In the absence of solid agreements on how to achieve compatible, interoperable services, the addition of signals becomes a bane, not a boon, to users of any and all GNSS systems.

GNSS Solutions

Differences between Signal Acquisition and Tracking

Why is acquisition of GNSS signals generally more difficult than tracking and what are the limiting factors?

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