Global Navigation Satellite Systems Engineering, Policy, and Design
In the world of GNSS we usually think of more as better. More systems, more satellites, more signals — all contribute to greater availability of robust positioning, navigation, and timing.
Certainly that was the mood at the June meeting of the Asia-Pacific Economic Cooperation — GNSS Implementation Team (APEC-GIT) in Seattle, Washington.
By Inside GNSS
Q: What is the carrier phase measurement? How is it generated in GNSS receivers?
A: Simply put, the carrier phase measurement is a measure of the range between a satellite and receiver expressed in units of cycles of the carrier frequency. This measurement can be made with very high precision (of the order of millimeters), but the whole number of cycles between satellite and receiver is not measurable.
By Inside GNSS
For the complete story, including figures, graphs, and images, please download the PDF of the article, above.
Evolution of GNSS into a global system of multiple systems opens up a new world of aviation applications, improving such factors as integrity, accuracy, and availability of positioning.
By Inside GNSS
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. HERE KITTY, KITTY
Nassau County,New York USA
√ IEEE Spectrum blogger Mark Spezio attached a GPS logger to his wandering cat, whose complex journeys centered on a mouse-hunting paradise: Nassau County Storm Water Basin Storage Area. The cat was amazed to see Mark show up at his secret hideaway.
See cat and maps here
By Inside GNSS
Only a decade ago, but a world away: 2000.
The last year of the old century that everyone thought was the first of the new.
When flying was still a delight, rather than a worrisome bother.
When the expected — a global Y2K bug–bitten IT meltdown — didn’t happen, and the much-anticipated but still-unexpected did: the United States turned off GPS selective availability.
By Inside GNSS
Human Engineering is an occasional feature that profiles GNSS engineers in industry, academia, the military and government.
Want to know someone’s favorite equation? Or how they discovered satellite navigation in their own careers? The popular notions about GNSS that annoy them most?
This is the place to look.
By Inside GNSS
Editorial from the first issue of Inside GNSS, January 2006:
By Inside GNSS
“GNSS Solutions” is a regular column featuring questions and answers about technical aspects of GNSS.
Readers are invited to send their questions to columnist Mark Petovello, Department of Geomatics Engineering, University of Calgary in Alberta, Canada. He will find experts to answer those questions, which will be published in Inside GNSS.
Dr. Petovello is a professor at the university. He has been actively involved in many aspects of positioning and navigation since 1997.
By Inside GNSS
This regular Inside GNSS column explores the technical and scientific themes that underpin Global Navigation Satellite System programs and applications.
It features analyses and discussions by engineers and researchers on topics ranging from GNSS interoperability to preferred technologies for GNSS receivers to antispoofing tools for GNSS signals.
The column is coordinated by Prof. Dr.-Ing Günter Hein, head of Galileo Operations and Evolution Department of the European Space Agency.
By Inside GNSS
