Aerospace and Defense

January 25, 2011

Lockheed Martin to Test GPS III in Virtual World

Collaborative Human Immersive Laboratory (CHIL) illustration (Lockheed Martin)

GPS III contractor Lockheed Martin has integrated several virtual reality technologies in a new Collaborative Human Immersive Laboratory (CHIL) in Littleton, Colorado, which will be used to validate and test next-generation GPS and other space programs.

With CHIL, Engineers and technicians can explore satellite designs and functions, troubleshoot and fine-tune them in a virtual world before building them in physical space.

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By Inside GNSS
January 18, 2011

Symmetricom Launches CSAC Product for Precise Timing and Synchronization

After eight years of successful participation in the Defense Advanced Research Projects Agency (DARPA) chip scale atomic clock (CSAC) initiative, Symmetricom, Inc., announced today (January 18, 2011) the general availability of what it says is the world’s smallest, lowest power atomic oscillator: a 16 cubic-centimeter unit weighing less than 35 grams (about 1.25 ounces) and operating on only 115 milliwatts of 3.3 VDC power.

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By Inside GNSS
January 9, 2011

Indian Regional Navigation Satellite System

FIGURES 1, 2 & 3

For the complete story, including figures, graphs, and images, please download the PDF of the article, above.

In satellite navigation, a GNSS receiver must account for several sources of error such as relativistic effects, atmospheric propagation delay, offset of satellite clocks from system time and satellite ephemeris. In order to accurately compute user position, velocity, and time (PVT), these errors need to be predicted/estimated precisely.

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By Inside GNSS
January 4, 2011

GPS Programs Push Ahead

The GPS program continues progress on several fronts — in space and on the ground.

During fall 2010, the U.S. Air Force and the Raytheon Company team developing the GPS Advanced Control Segment (OCX) successfully carried out an integrated baseline review (IBR) for the next-generation system on schedule.

When completed in 2015 under the current schedule, GPS OCX will deliver control segment enhancements designed to provide secure, accurate and reliable navigation and timing information to military, commercial and civil users.

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By Inside GNSS
December 31, 2010

Handicapping the GNSS Horse Race

Horses racing by Margret Hofheinz-Doering 1956

Return to "GNSS Year in Review"

We’ve come a long ways from the attitudes of the Cold War environment in which the Global Positioning System and GLONASS programs arose.

But that doesn’t mean that GNSS competition is a thing of the past. Indeed, the second most-read item on the Inside GNSS website during this year was a March 2009 article entired “GPS, GLONASS, Galileo, Compass: What GNSS Race? What Competition?”

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By Inside GNSS
December 30, 2010

GPS Directorate Completes Annual AGER Review

Col. Bernard Gruber

The GPS Directorate completed its second Annual GPS Enterprise Review (AGER) on December 17, concluding that the program has achieved major milestones in developing and deploying modernized GPS capabilities.

Col. Bernard Gruber, GPS program director at the Space and Missile Systems Center, Los Angeles Air Force Base, led his team through a Defense Acquisition Board (DAB) review chaired by Frank Kendall, deputy undersecretary of defense for acquisition, technology and logistics, and attended by other senior Department of Defense (DoD) officials.

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By Inside GNSS
November 5, 2010

LMCO Ships GPS III Simulator to Aerospace Corporation, Maintains Program Schedule Lead

Artist’s illustration of GPS III. Lockheed Martin image

The Aerospace Corporation has completed acceptance testing on the GPS III Bus Real Time Simulator (BRTS) from the Lockheed Martin–led team developing the next-generation satellite program, keeping the initiative ahead of schedule.

The BRTS is a specialized piece of test equipment designed to reduce risk and ensure overall mission success for the lifecycle of the GPS III program. The simulator will enable Aerospace Corporation to independently validate GPS III bus flight software for the U.S. Air Force.

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By Inside GNSS
October 25, 2010

Military PNT — The Way Ahead

FIGURE 1: The three foundations of C2 and how they are “changing the game” in an electronic battlespace: spectrum (communications media), yellow; computers (digital data), green; PNT (precise position and timing), blue.

With thanks to Yogi Berra, it’s “déjà vu all over again” for the Global Positioning System, but this time with a twist.

Twenty-five years ago, the question asked by U.S. military commanders and combat personnel in the field was, “Why should I go to the trouble to use this space-based system called GPS?” Today, the question being asked is, “GPS is vital to the success of my mission; so, why are you asking me to consider using something else?”

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By Inside GNSS
October 1, 2010

Launch Fever

It is not all about the satellites, of course.

And, despite the thrill of launches — the Fourth of July and every other national holiday celebration all grown up — it’s not about the rockets.

When evaluating the progress of GNSS programs, however, satellites and launches are a way to keep count — in fact, it is the way most of us do keep count.

By that measure, then, the numbers are adding up quickly.

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By Inside GNSS