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Magazine Department

June 22, 2010

Generating Carrier Phase Measurements

Q: What is the carrier phase measurement? How is it generated in GNSS receivers?

A: Simply put, the carrier phase measurement is a measure of the range between a satellite and receiver expressed in units of cycles of the carrier frequency. This measurement can be made with very high precision (of the order of millimeters), but the whole number of cycles between satellite and receiver is not measurable.

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By Inside GNSS

Testing Multi-GNSS Equipment

FIGURE 1: Single- and multi-channel simulators, GPS/Galileo (on top) and GPS/GLONASS software receiver USB front end with controlled power source

For the complete story, including figures, graphs, and images, please download the PDF of the article, above.

Testing procedures comprise an important element in the development, manufacturing, and integration of GNSS devices. Essentially, everybody involved in GNSS will be involved in or affected by testing at one time or another.

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By Inside GNSS

GLONASS CDMA

For the complete story, including figures, graphs, and images, please download the PDF of the article, above.

The decades of successful exploitation of satellite navigation systems GPS and GLONASS have confirmed their unique status as a basic resource for reliable worldwide, all-weather, all-season, round-the-clock positioning and timing. Nevertheless, the permanently widening sphere of their practical applications — as well as challenging requirements emerging from potential new users — give these systems a momentum for further evolution and progress.

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By Inside GNSS
May 31, 2010

Deselecting Unavailability

Only a decade ago, but a world away: 2000.

The last year of the old century that everyone thought was the first of the new.

When flying was still a delight, rather than a worrisome bother.

When the expected — a global Y2K bug–bitten IT meltdown — didn’t happen, and the much-anticipated but still-unexpected did: the United States turned off GPS selective availability.

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By Inside GNSS
October 16, 2007

Human Engineering

Human Engineering is an occasional feature that profiles GNSS engineers in industry, academia, the military and government.

Want to know someone’s favorite equation? Or how they discovered satellite navigation in their own careers? The popular notions about GNSS that annoy them most?

This is the place to look.

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By Inside GNSS
October 7, 2007

GNSS Solutions

“GNSS Solutions” is a regular column featuring questions and answers about technical aspects of GNSS.

Readers are invited to send their questions to columnist Mark Petovello, Department of Geomatics Engineering, University of Calgary in Alberta, Canada. He will find experts to answer those questions, which will be published in Inside GNSS.

Dr. Petovello is a professor at the university. He has been actively involved in many aspects of positioning and navigation since 1997.

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By Inside GNSS

Working Papers

This regular Inside GNSS column explores the technical and scientific themes that underpin Global Navigation Satellite System programs and applications.

It features analyses and discussions by engineers and researchers on topics ranging from GNSS interoperability to preferred technologies for GNSS receivers to antispoofing tools for GNSS signals.

The column is coordinated by Prof. Dr.-Ing Günter Hein, head of Galileo Operations and Evolution Department of the European Space Agency.

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By Inside GNSS
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