GNSS (all systems)

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January 18, 2016

GNSS Satellite-Based Augmentation Systems

Working Papers explore the technical and scientific themes that underpin GNSS programs and applications. This regular column is coordinated by Prof. Dr.-Ing. Günter Hein, head of Europe’s Galileo Operations and Evolution.

With the support of the European Space Agency (ESA), a European team designed a frequency- and time-transfer process and validated its performance in a complex navigation test bed. This two-way time-transfer technology took advantage of the following:

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By Günter W. Hein
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What is Doppler collision and is it a problem in GNSS?

Q: What is Doppler collision and is it a problem in GNSS?

A: Doppler collision is a physical effect in code-division multiple access (CDMA) systems where code measurement errors are observed due to cross-correlation effects. Doppler collision may occur when the Doppler frequency between signals from two different transmitters is smaller than the code lock loop bandwidth.

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By Inside GNSS
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GAGAN — India’s SBAS

The GPS Aided Geo Augmented Navigation (GAGAN) system was developed by the Indian Space Research Organization (ISRO), together with Airports Authority of India (AAI), to deploy and certify an operational satellite-based augmentation system (SBAS). The system’s service area covers the Indian Flight Information Region (FIR), with the capability of expanding to neighboring FIRs. 

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By Inside GNSS
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Measuring Navigation Payload Absolute Delay

In satellite navigation, the user receiver finds its position by measuring its distance to satellites and knowledge of the satellite position. The distance is measured by ranging, i.e., finding the delay of the signal from the transmitter to the receiver. The delay will comprise of payload hardware delay and the geometric range delay. Hence, the payload delay of the signal from generation to radiation is very important and needs to be transmitted in navigation data. 

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By Inside GNSS
ICG-11: International Committee on GNSS
January 14, 2016

ICG-11: International Committee on GNSS

Russia will host the eleventh meeting of the International Committee on GNSS (ICG) from November 6 to 11, 2016 in Sochi, on the Black Sea near Georgia. This meeting is organized by Roscosmos, the State Space Corporation. It will take place at the Pullman Sochi Center Hotel and Conference Center.

The ICG is a voluntary United Nations–backed association that brings together GNSS and augmentation providers, including the United States, Russia, European Union, China, India, and Japan.

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By Inside GNSS
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ICL-GNSS 2016: Localization and GNSS
January 13, 2016

ICL-GNSS 2016: Localization and GNSS

The sixth international conference on localization and GNSS will take place at the Universitat Autònoma de Barcelona (UAB) – Casa Convalescència, a UNESCO site, on June 28, 29 and 30 in Barcelona, Spain.

ICL-GNSS covers recent research on terrestrial and satellite-based positioning techniques to provide reliable, accurate and low latency position information with the goal of inspiring new design, implementation, test and evaluation methodologies for positioning platforms.

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By Inside GNSS
FIG Working Week 2016
December 29, 2015

FIG Working Week 2016

The topic of the International Federation of Surveyors (FIG) working week 2016 is "Recovery from Disaster." It will take place at the Horncastle arena and Addington Events Centre in Christchurch, New Zealand from May 2 through May 6. Appropriately enough, Christchurch has deep familiarity with recovery from disaster after the 2010-11 earthquake sequence that took place there.

Abstract submissions are now closed.

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By Inside GNSS
InterGEO 2016
December 28, 2015

InterGEO 2016

The 2016 InterGEO Trade Fair and Conference for Geodesy, Geoinformation and Land Management will take place at the fairgrounds —Hamburg Messe und Congress (HMC)—in Hamburg, Germany on October 11, 12 and 13.

Now 22 years old, the fair attracts 16,000 visitors from 92 countries who process, use or analyze geodata online or in the field.

The conference will cover the latest developments in surveying, geoinformation, remote sensing and photogrammetry and allied technologies. Proceedings are conducted in German and English.

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By Inside GNSS
ION Southern California Section December Meeting
December 9, 2015

ION Southern California Section December Meeting

The Southern California Section of the Institute of Navigation’s December meeting will take place at the John Deere facility in Torrance, CA on December 15, 2015.

Dr. Chun Yang will speak at the meeting.  The title of the talk is Sharpening Peak Performance of GPS Signals. In this talk, the variable IF tracking architecture that improves the
peak performance will be presented together with possible implementation
schemes. Simulation results will be used for illustration and analysis.

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By Inside GNSS
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