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Inside GNSS: Engineering Solutions from the Global Navigation Satellite System Community
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May 22, 2015

Contract Supports New Tests of eLORAN as GPS, PNT Backup

Exelis, UrsaNav, Inc., the Department of Homeland Security’s Science and Technology Directorate (DHS S&T), and the U.S. Coast Guard (USCG) have entered into a cooperative research and development agreement (CRADA) to test and demonstrate enhanced Loran (e-LORAN) service from former LORAN-C sites.

These sites are the legacy ground-based radio navigation infrastructure of the decommissioned LORAN-C service that could be retained and upgraded to provide eLORAN low frequency service.

Inside GNSS • May/June 2015

Estimating the Short-Term Stability of In-Orbit GNSS Clocks

Global navigation satellite systems provide position, velocity, and time (PVT) solutions to users whose receivers calculate position based on one-way ranging from satellites. As is well-understood, a key step in the positioning process involves a determination of the difference between the time of signal transmission identified in the satellite’s broadcast navigation message and the time of its reception by user equipment.

Inside GNSS • May/June 2015

Thinking Small

Unmanned aerial vehicles (UAV) are finding increased application in both domestic and governmental applications. Small UAVs (maximum take off weight less than 20 kilograms) comprise the category of the smallest and lightest platforms that also fly at lower altitudes (under less than 150 meters).

Designs for this class of device have focused on creating UAVs that can operate in urban canyons or even inside buildings, fly along hallways, and carry listening and recording devices, transmitters, or miniature TV cameras.

Inside GNSS • May/June 2015

Same Issues, Fierce Debate as LightSquared Bankruptcy Ends; GPS Spectrum Battle Reappears

After three years in Chapter 11, the company whose planned wireless broadband system threatened to overload GPS receivers across the United States is preparing to emerge from bankruptcy.

May 18, 2015

CSNC 2015 Raises BeiDou, GNSS Profile in China

More than 3,000 delegates converged on China’s ancient capital of Xi’an last week to infuse the sixth China Satellite Navigation Conference (CSNC) with an energy reflecting the nation’s robust GNSS program.

May 18, 2015

Riding High with EGNOS

Judging from the variety of questions being asked at a recent EGNOS flight demonstration, the European Geostationary Navigation Overlay Service (EGNOS) remains something of a mystery for many of Europe’s leading aviation writers.

EGNOS, you say? What’s EGNOS?

May 18, 2015

House Lawmakers Cut Civil GPS Funding across the Board

The House Appropriations Committee voted May 13 to cut the White House request for civil GPS funding and a number of other GPS-related program at the Dept. of Transportation.

May 18, 2015

GAO Report, Senate Subcommittee Hearing Confront USAF on GPS III Programs

GPS III satellites and their new ground system, both years behind schedule and hundreds of millions of dollars over budget, still may not be on track despite corrective actions, Air Force Secretary Deborah L. James told a U.S. Senate hearing recently.

May 26, 2015

USAF Draft RFP Would Re-Open Competition for GPS Satellite Launch Services

[Updated May 26, 2015] The U.S. Air Force released a draft request for proposal (RFP) yesterday (May 13, 2015) for GPS III Launch Services, including launch vehicle production, mission integration, and launch operations. The Space Exploration Technologies Corporation — better known as SpaceX and headed by Elon Musk — may well enter the competition.

May 7, 2015

International Working Group Agrees on Common GNSS SBAS Message Design

The next decade’s aircraft pilots will be able to rely on enhanced, reliable GNSS satellite navigation signals on a seamless basis across much of the world, thanks to decisions made at the latest gathering of worldwide GNSS augmentation system providers and experts.

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