Global Navigation Satellite Systems Engineering, Policy, and Design
Once the next-generation GPS III satellites begin launching later this year, a series of updates to the current ground control system from Lockheed Martin will help the U.S. Air Force gain early command and control of the new satellites for testing and operations.
By Inside GNSS
An open source implementation of a Global Navigation Satellite System (GNSS) software receiver targeting the Globalnaya Navigatsionnaya Sputnikovaya Sistema (GLONASS) L1 C/A signal addition is presented.
By Günter W. Hein
One of the more popular sessions in recent years at the annual ION GNSS+ technical meeting is the panel discussion on a variety of satellite-based navigation systems, and it appears as if Chinese officials will have plenty of updates on its BeiDou navigation and positioning system to share.
By Stan Goff
With Europe’s Galileo constellation in space now expanded to 26 navigation satellites – and Galileo Initial Services available to users worldwide – the infrastructure on the ground that controls them is undergoing a corresponding expansion.
By Inside GNSS
Precision agriculture is just one of many sectors taking advantage of advancements in GNSS technology in recent years, but few have the potential to make such a big impact.
By Stan Goff
Though the Senate approved next year’s funding for the Department of Defense (DOD) just before its Labor Day break there are still hurdles to overcome before the fiscal year runs out on September 30. For the most part further delay should not greatly impact GPS efforts — as long as stopgap funding is secured to keep DOD’s doors open — but extending the deadline will likely put the GPS IIIF program on hold.
By Dee Ann Divis
The first of the U.S. Air Force’s advanced new, higher-power, harder-to-jam GPS III satellites is making its way to the launch pad.
By Inside GNSS
There was a flurry of filings July 9 just as the window closed for public comment on Ligado Networks’ proposal to repurpose satellite frequencies for a terrestrial network — a plan with the potential to interfere with GPS receivers.
The comments emerged as speculation swirled around a July 3 bid by EchoStar for Ligado spectrum supplier INMARSAT. The bid was rejected and, as of press time, EchoStar will have to wait six months before trying again.
By Dee Ann Divis
CAPE CANAVERAL AIR FORCE STATION, Fla.– The U.S. Air Force’s Space and Missile Systems Center (SMC) Global Positioning Systems (GPS) Directorate achieved a major program milestone Aug. 21, successfully delivering the first GPS III satellite to Cape Canaveral Air Force Station, Florida to begin launch processing.
By Inside GNSS
As the first Lockheed Martin-built GPS III satellite prepares to ship to the launch pad, the U.S. Air Force has declared that the second GPS III satellite is complete, fully tested and ready to launch.
By Inside GNSS
The deck of a tall ship rolled heavily beneath me as a freshening wind whistled through the rigging. A sextant in one hand and a stop watch in the other, I carefully listened. “Tock, Tock, Tock, Tock… the time is now fourteen hours, fifty-eight minutes, Coordinated Universal Time… Dong.” I clicked the stop watch in preparation for checking and winding the ship’s chronometers and measuring the height of the sun at local apparent noon.
By Inside GNSS
The newly signed Defense Authorization Act incorporates a number of GPS-related provisions though a measure ordering the creation of a GPS timing back-up was pulled by conferees as they hammered out their final deal.
By Dee Ann Divis
With plenty of promise, the third launch of Europe’s Galileo constellation took place four years ago. What followed was not at all what was expected, as problems turned much of the promise into gloom.
By Inside GNSS
