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GNSS (all systems)

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

FIGURE 1 (a, b, c) & FIGURE 2

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
2011 Space Weather Workshop
January 17, 2011

2011 Space Weather Workshop

Forecasters at NOAA’s Space Weather Prediction Center (NOAA photo)

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
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InterGEO 2011

InterGEO 2011

Nuremberg Pilatushaus and castle

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
United Arab Emirates GNSS Applications Workshop

United Arab Emirates GNSS Applications Workshop

Higher Colleges of Technology (HCT), Dubai

The United Nations International Committee on GNSS (ICG) and the U.S. State Department has organized a workshop on GNSS applications from Sunday, January 16 to Thursday, January 20, 2011, at the campus of the Higher Colleges of Technology in Dubai Academic City.

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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 X30 controller

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
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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
Wavelets and Notch Filtering

Wavelets and Notch Filtering

FIGURE 1: Touching wavelet spectra

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

The use of GNSS for safety critical applications is gaining interest, particularly amongst aviation users, who probably have the most demanding requirements. The GNSS frequency band containing the Galileo E5 and GPS L5 signals is designated as an aeronautical radio navigation service (ARNS) band, which enjoys legal protection from other services not allocated to this frequency on a primary basis.

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By Inside GNSS
Gianni-500px.jpg

A Model-Based Approach

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

Galileo receiver designers require formal interface specifications for the Galileo signal-in-space (SIS) in order to write unambiguous and accurate specifications for Galileo receivers. To compute their positions, Galileo receivers must be able to retrieve timing and orbital information from the data stream conveyed in Galileo analog signals.

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By Inside GNSS
Indian Regional Navigation Satellite System

Indian Regional Navigation Satellite System

FIGURES 1, 2 & 3

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

In satellite navigation, a GNSS receiver must account for several sources of error such as relativistic effects, atmospheric propagation delay, offset of satellite clocks from system time and satellite ephemeris. In order to accurately compute user position, velocity, and time (PVT), these errors need to be predicted/estimated precisely.

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By Inside GNSS
GNSS Interference, Detection and Mitigation

GNSS Interference, Detection and Mitigation

Bushy House

Britain’s Position, Navigation and Timing Network of the Digital Systems
KTN (Knowledge Transfer Network) presents a one-day workshop on
"GNSS Interference, Detection and Mitigation."

Professor Martyn Thomas will present the
conclusions of the Royal Academy of Engineering report on GNSS vulnerability, which was released on March 8.  

The workshop will take place at Bushy House, National Physical Laboratory, Teddington, Middlesex on Thursday, March 10 2011 from 10 a.m. to 4 p.m.

Topics include:

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By Inside GNSS
Natural Threats to GNSS Positioning
January 8, 2011

Natural Threats to GNSS Positioning

Bushy House

Britain’s Position, Navigation and Timing Network of the Digital Systems KTN (Knowledge Transfer Network) presents a one-day workshop on "Natural Threats to GNSS Positioning."

It will take place at Bushy House, National Physical Laboratory, Teddington, Middlesex on Wednesday, January 19 2011 from 10:00 a.m. to 3:30 p.m.

A number of natural phenomenon affect GNSS reliability and accuracy. These include:

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By Inside GNSS
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