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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.

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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. 

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By Inside GNSS
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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. 

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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.

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By Inside GNSS
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.

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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:

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By Inside GNSS
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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

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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.

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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.

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By Inside GNSS
December 30, 2008

GNSS and ICG in the News

Inside GNSS Editor Glen Gibbons talked about GNSS coverage and how journalists see the technology in a presentation to the delegates of the third meeting of the International Committee on GNSS (ICG-3) in December 2008 in Pasadena, California.

Thank you for the invitation to speak today. I’ve been writing about GNSS for more than 19 years, but here I’ve been asked to make a few comments about how journalists cover the subject of GNSS and an organization like the ICG.

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By Inside GNSS
November 25, 2008

GNSS Hotspots | November 2008

One of 12 magnetograms recorded at Greenwich Observatory during the Great Geomagnetic Storm of 1859
1996 soccer game in the Midwest, (Rick Dikeman image)
Nouméa ground station after the flood
A pencil and a coffee cup show the size of NASA’s teeny tiny PhoneSat
Bonus Hotspot: Naro Tartaruga AUV
Pacific lamprey spawning (photo by Jeremy Monroe, Fresh Waters Illustrated)
“Return of the Bucentaurn to the Molo on Ascension Day”, by (Giovanni Antonio Canal) Canaletto
The U.S. Naval Observatory Alternate Master Clock at 2nd Space Operations Squadron, Schriever AFB in Colorado. This photo was taken in January, 2006 during the addition of a leap second. The USNO master clocks control GPS timing. They are accurate to within one second every 20 million years (Satellites are so picky! Humans, on the other hand, just want to know if we’re too late for lunch) USAF photo by A1C Jason Ridder.
Detail of Compass/ BeiDou2 system diagram
Hotspot 6: Beluga A300 600ST

1. Alaska to New Zealand
EXTREME FLIGHT

Meet the world’s endurance champions— bar-tailed godwits. One of these migrating shorebirds, “E7,” made an unprecedented nonstop Pacific Ocean flight from Alaska to New Zealand. USGS researchers tracked her using a battery-powered transmitter and satellite telemetry. She flew 7,200 miles in eight days without rest or food, using energy at 8 times her Basal Metabolic Rate. Read the story in October’s Proceedings of the Royal Society: B.

1. Alaska to New Zealand
EXTREME FLIGHT

Meet the world’s endurance champions— bar-tailed godwits. One of these migrating shorebirds, “E7,” made an unprecedented nonstop Pacific Ocean flight from Alaska to New Zealand. USGS researchers tracked her using a battery-powered transmitter and satellite telemetry. She flew 7,200 miles in eight days without rest or food, using energy at 8 times her Basal Metabolic Rate. Read the story in October’s Proceedings of the Royal Society: B.

2. Tampa, Florida USA
HIT AND MISS

Tampa Tribune reporters decided to find out why police couldn’t locate a kidnapped woman after she called 9-1-1: Her cell phone was too old. Most new phones have GPS. But some use triangulation – which requires several well-positioned towers. Plus, getting a fix takes time. And about half of U.S. 911 call centers haven’t upgraded their computer systems yet, says CTIA, the wireless industry group.

3. Essex, England
MAN OVERBOARD!

An Essex, UK start-up, Sci-Tech Systems Ltd., run by East Anglian sailing enthusiasts, won the top Galileo Masters Award and two other prizes at the 2008 European Satellite Navigation Competition on October 21 in Munich. They designed a tracking system that quickly locates someone who has fallen overboard a ship. It works with existing maritime navigation systems.

4. Baikonur, Kazakhstan
CHRISTMAS PRESENT

Three more GLONASS satellites will launch from Baikonur space center on December 25, says Russian state news agency RIA Novosti. Seventeen are now “set healthy.” The system requires 18 satellites to cover the Federation, and 24 satellites for global coverage. Roscosmos chief Anatoly Perminov said in September that GLONASS would have 30 satellites by 2011.

5. Krasnoyarsk, Russia
BUILDING BRIDGES

Russian Prime Minister Putin announced the “first project of practical application of GLONASS in the national economy” during an October visit to Krasnoyarsk, reported news agency Itar-Tass. GLONASS will be used to monitor construction, operations, and weather conditions on a new bridge over the Yenisei, the world’s fifth largest river. Data gathered from sensors on the bridge will be accurate to one or two millmeters.

6. Beijing, China
BEIDOU’S SECOND WIND

China plans to launch 10 Compass satellites during the next two years — starting as early as December 2008 — in order to create a regional PNT capability in the Asia-Pacific region by 2010. China’s GNSS plans have been out of public view for a while — this announcement was quietly revealed on November 5 at Stanford University’s “PNT Challenges and Opportunities Symposium.”

By Alan Cameron
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