201303 March/April 2013

Letters: Get a Start on GNSS Interoperability Now

“The GNSS Quartet” (January-February 2013, Inside GNSS, aptly named and coauthored by Glen Gibbons, Dee Ann Divis, and Peter Gutierrez) is reminiscent of Dr. Brad Parkinson’s observation about “interchangeability” at his ION GNSS 2011 plenary session. With interoperability taken to its logical level of completion, a position solution should be readily obtainable from four satellites, each belonging to a different constellation.

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By Inside GNSS

Civil Use of UAS

Chuck Johnson, NASA

Few domestic issues have evoked such excitement — and controversy — in recent years as a 2012 congressional mandate to the Federal Aviation Administration (FAA) to expand civil use of unmanned aerial systems in the National Airspace System (NAS).

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By Dee Ann Divis

GNSS Hotspots

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. LATE LAUNCHES
Cape Canaveral and Plesetsk
√ [updated April 1] After three delays, a single GLONASS-M satellite will go up from Plesetsk space center on April 26. The United States will send up SVN66, the fourth GPSIIF satellite— on an Atlas V launcher for the first time—during the early evening of May 15. It had been delayed from March.

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By Inside GNSS
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