Global Navigation Satellite Systems Engineering, Policy, and Design
Global Navigation Satellite Systems Engineering, Policy, and Design
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. HURRICANE NEXT
Baton Rouge, Louisiana USA
√ Will Gulf of Mexico tropical storms become new Katrinas or nothing much? Moisture fuels hurricanes; so, NOAA and Louisiana State University researchers installed two new GPS-Meteorology packages on offshore oil platforms to gather the first Gulf ionospheric water vapor readings using dual-frequency techniques. The hope: better prediction of storm intensity and sea surge potential.
Back to "GPS: The Present Imperfect"
Let’s take a look at that great work of contemporary English literature,
Dan Brown’s 2003 mystery, The Da Vinci Code.
We thrill as the evil Captain Fache uses a tiny GPS to track our unknowing
Hero and his Lady Friend as they explore an underground crypt far
beneath the Louvre in Paris.
That GPS is accurate to two feet. Now, this scene manages to combine in a
single paragraph four great myths concerning GPS:
Back to "GPS: The Present Imperfect"
What happens when GPS or GNSS has a bad-hair day due to jamming or
interference?
Radiating very high-powered signals at low frequency, the land-based
transmissions of an enhanced Loran (eLoran) system offer an excellent
complement to GPS with their low-powered, microwave frequency signals,
eliminating common modes of failure.
Return to main article: "GPS: The Present Imperfect"
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I am as guilty as any journalist of using my editorial pulpit to air grievances and issue snarky asides, to browbeat and reprove.
So, I will take this opportunity to redeem not only myself but also, in a modest way, my profession, by coming today not to complain but to celebrate.
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Sponsors of NAVITEC 2010, the fifth European Space Agency (ESA) Workshop on Satellite Navigation Technologies, have issued a call for papers for the event scheduled December 8-10 at the ESA/ESTEC facility in Noordwijk, The Netherlands
Papers submitted to the workshopPapers should describe original contributions in this field and will be selected on the basis of abstracts of 600-800 words in length, which must be submitted by May 21. Authors will be notified of the decision of the program committee by 9 July 2010.
By Inside GNSS
With a given GPS receiver you get a certain positioning accuracy. So, the first question you may ask is: can I do anything to improve it?
The answer most often is: yes, go and buy a better receiver! Most ranging errors are determined by physics and you can do little to improve the situation.
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Multi-purpose jammer blocks GPS signals as well as DCS, 3G and GSM mobilephones
SIDEBAR: Four Popular Myths about GNSS
SIDEBAR: To the Rescue: eLoran?
Quietly but surely, positioning, navigation and timing are being taken for granted.
The location information that GPS gives us is now at the heart of our transportation capabilities, distribution industries, just-in-time manufacturing, emergency service operations, not to mention mining, road-building, and farming.
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