GNSS (all systems)

Does the Caged Bird Still Sing? or, GPS and the Bluebird of Happiness
March 2, 2011

Does the Caged Bird Still Sing? or, GPS and the Bluebird of Happiness

Listening to today’s panel discussion on GNSS spectrum issues — with the hopeful subtitle, “A Place Where Competitors Become Colleagues?” — brought to mind a metaphorical description of the GPS signal environment that I heard recently.

The Munich Satnav Summit discussion revolved around the growing pressure on GNSS from other RF users, such as LightSquared, desiring to set up in radionavigation satellite system (RNSS bands).

Somewhat embellished, the description was this:

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By Inside GNSS
Willkommen zum GNSS-Fest
March 1, 2011

Willkommen zum GNSS-Fest

Perhaps it was Bavaria’s famous, free-floating Gemütlichkeit or just the excellent jazz ensemble from a nearby town, but the opening plenary at the Munich Satellite Navigation Summit this evening (March 1) was awash in benign goodwill but little new insight into the condition of the world’s GNSS systems.

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By Inside GNSS
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Webinar: Use GNSS Record and Replay to Make Testing More Effective
February 26, 2011

Webinar: Use GNSS Record and Replay to Make Testing More Effective

The makers of LabSat GNSS simulators, in cooperation with NavTech GPS, will host an interactive webinar in March on "How to use GNSS Record and Replay to make your testing faster and more effective." Two sessions will be held.

The US session takes place at 12:30 p.m. EST (9:30 a.m. PST, 17:30 GMT) on Wednesday, March 2 2011.

The UK/European session takes place at 14:00 GMT on Thursday, March 3 2011.

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By Inside GNSS
GPS/ GNSS Community Feels New Telecom Interference Threat from LightSquared
January 30, 2011

GPS/ GNSS Community Feels New Telecom Interference Threat from LightSquared

In his State of the Union address on January 25, President Obama held up the Global Positioning System as a prime example of government providing “cutting-edge scientists and inventors with the support that they need” to create world-leading, job-creating innovation.

The following day, the Federal Communications Commission (FCC) International Bureau approved a conditional waiver allowing LightSquared Subsidiary LLC to build tens of thousands of terrestrial transmitters for wireless communications in frequencies on either side of the GPS L1 band.

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By Inside GNSS
Your Signal Is My Noise
January 21, 2011

Your Signal Is My Noise

Most people probably don’t associate engineers and linguistic virtuosity.

The attitude is unfair, of course, as with so many stereotypes.

And also untrue.

For example, as the number of existing or planned GNSS systems grew during the past few years, the expression “Your signal is my noise” has recurred in the engineering community with increasing frequency.

I consider that an elegant, if ominous, turn of phrase. A simple declarative sentence, pithy, with an ironic edge, yet almost lyrical.

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By Inside GNSS
Spectrum-Compact Signals

Spectrum-Compact Signals

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

In the early stages of developing space-based radionavigation, the spectrum compactness of ranging signals was not proclaimed among the material priorities. Conventional bi-phase shift keying (BPSK) modulations, although they consume a rather large amount of spectrum, were adopted as the basis for both GPS and GLONASS signals.

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By Inside GNSS
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2011 Space Weather Workshop
January 17, 2011

2011 Space Weather Workshop

The annual Space Weather Workshop will take place on April 26-29 2011 in Boulder, Colorado.

Program organizers call it the "meeting of science, research, applications, operations and users." The program highlights space weather impacts in several areas, including
communications, navigation, spacecraft operations, aviation, and
electric power. 

Recent progress in large-scale modeling efforts will
be featured; while new developments in Sun-to-Earth coupled modeling systems
will also be a highlight.

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By Inside GNSS
InterGEO 2011

InterGEO 2011

The 2011 InterGeo conference and trade fair for geodesy, geoinformation and land managment will take place at the CNN CongressCenter Nürnberg in Nuremberg, Germany from September 27 to 29, 2011.

It is organized by DVW e.V. – German Society for Geodesy, Geoinformation and Land Management.

The conference language is German.

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By Inside GNSS
Topcon and DICKEY-john Form Alliance Around Ag System Development
January 11, 2011

Topcon and DICKEY-john Form Alliance Around Ag System Development

Topcon Positioning Systems (TPS) and DICKEY-john Corporation, an agricultural systems and machine control manufacturer based in Auburn, Illinois, have formed a strategic relationship in the agriculture industry.

Headquartered in Livermore, California, TPS recently unveiled its System 350 machine control system, which employs the company’s new X30 control console and its AGI-3 receiver for autosteering.

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By Inside GNSS
Differences between Signal Acquisition and Tracking
January 9, 2011

Differences between Signal Acquisition and Tracking

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

A: A fairly good analogy of the difference between GNSS signal acquisition and tracking can be found in the rescue of victims of a sunken ship whose location is not accurately known. The first stage of the rescue attempt typically involves an aircraft flying a search pattern, which hopefully encompasses the location where the ship went down.

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By Inside GNSS
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