Global Navigation Satellite Systems Engineering, Policy, and Design
Equation 1Working Papers explore the technical and scientific themes that underpin GNSS programs and applications. This regular column is coordinated by Prof. Dr.-Ing. Günter Hein, head of Europe’s Galileo Operations and Evolution.
By Inside GNSS
Weiss at the helm during sailboat outing to San Juan Islands (top), Marc Weiss and wife, Pam (bottom)SIDEBAR: Marc Weiss’ Compass Points
In a career spanning nearly the entire history of GNSS-enhanced metrology, Marc Weiss has been a key participant in projects that laid the foundation for accurate synchronization of atomic clocks around the world.
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. PAPER, PLEASE.
Silver Spring, Maryland USA
√ The USA will stop printing nautical charts next April, the end of a 150 year tradition. Why? “Declining demand, electronic and digital charts and federal budget realities,” said NOAA’s Office of Coast Survey. They will maintain and update PDFs of more than a thousand coastal charts and refer those who admire traditional lithography to private printers who can do the job.
Return to main article: "Finding the Right Algorithm"
By Inside GNSS
Return to main article: "Finding the Right Algorithm"
By Inside GNSS
Return to main article: "Finding the Right Algorithm"
By Inside GNSS
Return to main article: "Finding the Right Algorithm"
By Inside GNSS
Elizabeth Rooney at home with Hana and JosephGNSS event that most signified to you that GNSS had “arrived”
Two events stand out:
By Inside GNSS
Editor’s Note: On November 19, Senator Roger Wicker (R-Mississippi), a member of the Senate Armed Services Committee, filed an amendment (No. 2185) to the FY 2014 National Defense Authorization Act (S. 1197),
Section 1082, that would limit the construction of satellite
positioning ground monitoring stations controlled by any foreign
government on U.S. soil. Such construction would require certification
Receiver (on the right) and antenna (on the left) comprised the on-board unit used in both data collectionsWorking Papers explore the technical and scientific themes that underpin GNSS programs and applications. This regular column is coordinated by Prof. Dr.-Ing. Günter Hein, head of Europe’s Galileo Operations and Evolution.
By Inside GNSS
Q: How Does Non-Line-of-Sight Reception Differ From Multipath Interference?
A: It is well known that GNSS signals may be reflected by buildings, walls, vehicles, and the ground. Glass, metal, and wet surfaces are particularly strong reflectors.
By Inside GNSS
Main antenna on FOC Galileo satelliteSIDEBAR: Elizabeth Rooney’s Compass Points
Going for her first big job interview after college, Elizabeth Rooney admits she didn’t know what GPS was.
“It was 1995,” she says, “and I was going in to see about this job. I had been looking at some literature from the company I was interviewing with, and there it was, ‘GPS.’ I wondered what the letters meant when I saw them.”
By Inside GNSS
Some of the specific technical issues behind the latest delay for Galileo’s first full operational capability (FOC) satellites have already been reported. The story, as it is told, generally starts with a late navigation payload delivery by British firm Surrey Satellite Technology to the German prime contractor, OHB. Next, OHB ran into issues with the payload and the platform, further stretching out the timeline.
By Peter Gutierrez
