Global Navigation Satellite Systems Engineering, Policy, and Design
Chuck Johnson, NASAFew 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).
By Dee Ann Divis
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.
Return to main article: "GNSS Filtering Options"
By Inside GNSS
Return to main article: "GNSS Filtering Options"
By Inside GNSS
TABLE 1: Deployment Status Note: Two types of clocks on board: PHM = Passive Hydrogen Maser, RAFS = Rubidium Atomic Frequency StandardEurope’s new age of satellite navigation has passed a historic milestone — the very first determina-tion of a ground location using the four Galileo satellites currently in orbit together with their ground facilities.
This fundamental step confirms the Galileo system works as planned.
By Inside GNSS
Bayes RuleEngineering specialties
Navigation research and development is truly an interdisciplinary enterprise. I have focused on
By Inside GNSS
One of my fond memories as a boy growing up in rural northeastern Oregon is sitting on an apple box in the basement of our house reading back issues of National Geographic.
All those wonderful color photos. And the maps, with their little illustrated explanations of Roman ruins in England or Babylonian irrigation practices in the Fertile Crescent!
By Inside GNSS
