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Aerospace and Defense

New Fiscal Year Begins with Unfinished GPS Business

New Fiscal Year Begins with Unfinished GPS Business

Most folks look to a new year as an opportunity for fresh starts and new projects. For the GPS community, however, the October 1 start of the 2016 federal fiscal year (FY16) will likely be more about the hangover — that is, the issues that are hanging over into the next 12 months, unresolved.

At the top of that list of unfinished business are two system decisions: a go/no-go determination on whether the United States will build eLoran as the U.S. backup to GPS and deciding whether or not to choose a new contractor for the GPS III program.

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By Dee Ann Divis
LightSquared Launches New GPS Receiver Tests
August 31, 2015

LightSquared Launches New GPS Receiver Tests

LightSquared’s proposed GPS receiver tests are relying on an outdated standard of GPS accuracy, a choice some experts suggest is a maneuver aimed at dramatically lowering the bar the would-be wireless broadband company has to meet for showing noninterference to GPS signals.

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By Inside GNSS
PTTI 2016: Precise Time and Time Interval Meeting
August 19, 2015

PTTI 2016: Precise Time and Time Interval Meeting

The Precise Time and Time Interval Systems and Applications meeting is technical conference held each year for PTTI managers, system engineers and program planners. It will be held at the Hyatt Regency in Monterey, California on January 25 through 28. It is sponsored by the Institute of Navigation (ION).

In 2016, for the first time, PTTI will be co-located with the ION International Technical Meeting. Registration for one event entitles attendees to attend all sessions of both events.

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By Inside GNSS
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Appropriations Impasse Could Stall U.S. GPS Programs
August 17, 2015

Appropriations Impasse Could Stall U.S. GPS Programs

The federal government is once again approaching the end of its fiscal year without the appropriations necessary to keep the doors open come October 1 — a reality that could undermine GPS modernization and related programs.

Congress, now in the midst of its August recess, will have just 12 days to sort things out when members return after Labor Day. Under the best of circumstances, lawmakers would almost certainly need to pass a continuing resolution (CR) to extend current spending levels and buy themselves time to hammer out budgetary deals.

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By Inside GNSS
Officials Delay First GNSS Authorization Request; Light-Squared Tries to Leverage Issue

Officials Delay First GNSS Authorization Request; Light-Squared Tries to Leverage Issue

The U.S. stance on satellite navigation has long supported international cooperation and a degree of interoperability. In 2010 the Obama administration even adopted a space policy that said foreign satnav services could be used “to augment and strengthen the resiliency of GPS.”

That was easier in the abstract, however, when the only fully functional GNSS was GPS. Now, with other GNSS services coming online, American officials want to think things through again.

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By Dee Ann Divis
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10th GPS IIF Satellite on Its Way to Orbit
July 15, 2015

10th GPS IIF Satellite on Its Way to Orbit

The U.S. Air Force and its mission partners successfully launched the 10th Boeing-built GPS IIF satellite aboard a United Launch Alliance Atlas V from Cape Canaveral Air Force Stations today (July 15, 2015).

The spacecraft is destined for plane C/slot 3 of the GPS constellation

The launch almost coincided with Friday’s 20th anniversary of the declaration of full operational capability (FOC) for the GPS constellation, which occurred on July 17, 1995.

Just two GPS IIF satellites remain to be launched — Atlas V rockets will be used to launch both.

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By Inside GNSS
GPS Directorate Gains New Leader
July 10, 2015

GPS Directorate Gains New Leader

Col. Steve Whitney now heads GPS Directorate

Colonel Steve Whitney was sworn in Wednesday (July 8, 2015) as the director of the Global Positioning Systems (GPS) Directorate, Space and Missile Systems Center, Air Force Space Command, Los Angeles Air Force Base, California.

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By Inside GNSS
Software-Defined GNSS Simulator: A Step Forward

Software-Defined GNSS Simulator: A Step Forward

A few studies (by universities and industry) have shown the feasibility of simulation of real-time digital intermediate frequency (IF) signals based on a graphics processor unit (GPU). And a couple of articles have also demonstrated use of a universal software radio peripheral (USRP)–based software-defined radio (SDR) as a simulator (in playback mode) in real test environments.

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By Inside GNSS
First Position Fix with IRNSS

First Position Fix with IRNSS

Figure 1

The Indian Regional Navigation Satellite System (IRNSS) is an Indian Space Research Organisation (ISRO) initiative to build an independent satellite navigation system that provides precise position, velocity, and time (PVT) to users across the Indian region.

The primary objective of IRNSS is to achieve position accuracy of 20 meters (2σ) for dual-frequency users over India and the primary service area (a region extending to about 1,500 kilometers or 930 miles).

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By Inside GNSS
upadhyay-500px.jpg
May 20, 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.

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By Inside GNSS
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