Uncategorized Archives - Page 78 of 82 - Inside GNSS - Global Navigation Satellite Systems Engineering, Policy, and Design

July 4, 2009

Architecture for a Future C-Band/L-band GNSS Mission, Part 2

The downloadable PDF (above) contains bonus material not available in the print edition.

This column continues an exploration of possible use of the C-band radio frequency for GNSS navigation. Part 2 focuses on C-band signal design in the context of non-interference with other services in nearby RF bands, as well as user equipment design and performance.

What is GNSS repeater-based positioning and how is it different from using pseudolites?

Figure 1: Indoor positioning configuration with switching repeater with multiple re-radiation antennas.

Q: What is GNSS repeater-based positioning and how is it different from using pseudolites?

A: A GNSS repeater is just like a cellular phone repeater that is used to boost the cell phone reception by using a reception antenna, a signal amplifier and an internal rebroadcast antenna. In contrast to cellular broadcast stations, GNSS repeaters are much smaller and often installed inside buildings with an external reception antenna collecting the satellite signals.

Making Sense of GPS Inter-Signal Corrections

Figure 1

The downloadable PDF (above) contains bonus material not available in the print edition. Appendices and other information on this subject is available at the bottom of the page.

The current version of the master GPS Interface Specification document (IS-GPS-200 Rev D March 2006) contains a new dual-frequency ionosphere correction algorithm that is to be used with the modernized GPS space vehicles (SVs) and their next-generation modernized GPS signals.

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May 15, 2009

16th International Flight Inspection Symposium

IFIS 2010 will be held in Beijing from June 21-25.

The theme is “Improving Flight Inspection for NextGen Technology.” Flight inspection is presented with a host of opportunities and challenges as Satellite-based Navigation and Performance Based Navigation open the way to even more advanced methods of airspace navigation.

By Inside GNSS

May 5, 2009

European Navigation Conference – ENC-GNSS 2009

The European Navigation Conference 2009 is now underway at Parthenope University in Naples, Italy.

In the opening session on Monday, May 4, the chief engineer for the GPS Wing told the audience that the new L5 demonstration signal transmitted by GPS IIR-20(M) had been experiencing problems and apparently interfering with L1 and L2 legacy signals. Lt. Col. David Goldstein said the Air Force will not launch any more satellites until the cause has been discovered and fixed.

By Inside GNSS

April 28, 2009

About BeiDou

China intends to finish their Beidou Navigation Satellite System (BDS, formerly known in English as "Compass") by 2020. When complete, the constellation will will consist of 35
satellites: 5 geostationary orbit (GEO) satellites, 27 in Medium Earth Orbit (MEO) and 3 in Inclined
Geosynchronous Orbit (IGSO).

BDS began providing services to civilian users in China and surrounding areas in the Asia-Pacific in December 2012.

By Inside GNSS

April 27, 2009

TRANSNAV Symposium 2009

The 8th navigational symposium on marine navigation and safety of sea transportation will be held at Gdynia Maritime University in June.

Scientists and navigation professionals from a number of countries will share their knowledge, experience and research results in all aspects of navigation, safety of navigation, and sea transportation.

By Inside GNSS

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April 15, 2009

Ka and Broadband Communications, Navigation and Earth Observation Conference

The 15th Ka and Broadband Communications, Navigation and Earth Observation Conference will be held in September at the "T" Hotel in Cagliaria, the capital of Sardinia.

The Italian Space Agency (ASI) conference originally covered satellite communications at 20-30 GHz and higher frequencies. In recent years, it has been expanded to include satellite
broadband communications at all frequencies and satellite-aided navigation.

The event includes the 7th Broadsky Workshop, which will focus on the escalating problems of space debris.

By Inside GNSS

March 15, 2009

2009 International ESRI User Conference (ESRI UC)

ESRI UC, the largest conference for GIS users, developers, integrators and suppliers will take place at the San Diego Convention Center in San Diego, California USA from July 13 to July 17 2009.

The conference registration deadline is May 22, 2009.

The educational side of the event includes breakout conferences on GIS and
remote sensing, homeland security, survey and engineering, and
education.

For a complete list of session tracks go to:

By Inside GNSS

January 10, 2009

GSMA Mobile World Congress

The mobile industry’s largest exhibition will be held at Fira Montjuïc in the center of Barcelona, Spain February 16-19 2009. The event features 50,000 attendees, presentations and networking events, awards for best technology, keynotes by noted corporate leaders, an associated film festival, and more.

The 2009 keynoters are:
Cesar Alierta Chair and CEO, Telefonica
Jon Fredrik Baksaas, President and CEO,Telenor
Steve Ballmer, CEO Microsoft

By Inside GNSS

European Geosciences Union General Assembly 2009

The EGU General Assembly 2009 will be held at the Austria Center Vienna from April 19 to April 24. The official language is English and scientists from all countries are welcome.

Live press conferences are available here Monday through Thursday: http://www.webstream.at/egu
Please check the Press Conference Program for further details.

By Inside GNSS

January 6, 2009

ION GNSS 2009

The 2009 Institute of Navigation GNSS conference will take place again this year at the Savannah International Conference Center in Savannah, Georgia USA.

This will be the 22nd international technical meeting of the Satellite Division of ION. It is the world’s largest and oldest GNSS conference, founded in 1987 as the ION GPS conference.

By Inside GNSS