July/August 2015

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Earlier this year, India’s regional navigation constellation, IRNSS, demonstrated independent three-dimensional position determination for the first time using a combination of geostationary and geosynchronous satellites now in orbit. The navigation software team from the Indian Space Research Organization describes this achievement.

Thanks to advances in the design and capabilities of graphics processing units, the real-time computational capabilities of the conventional PC are significantly improved. This article describes the development and performance of an SDR simulator that combines the real-time computational capabilities of a GPU with universal software radio peripherals.

Level playing field or national “champions”? This article by two legal scholars examines the legal, economic, and political issues arising from the cross-currents caused by the requirements of international trade agreements and the inclination of nations to favor their own GNSS programs.

Having set what many in the Defense Department call the Gold Standard of PNT, it would be a shame to see a “Defexit” from GPS.

The cornfields of eastern China cemented this engineer's interest in GNSS positioning and navigation.

Recent increases in computational power can be used to build more efficient GNSS software receivers. Experimental benchmarks show how well the currently available technology can be exploited for these purposes. A personal computer (maximum number of channels greater than 1,000) and an embedded board (maximum number of channels less than 100) are tested under various scenarios, with promising results for future applications.

Cuba Libres, Lucky Seven Airmen, GPS Launch Competition and Staying Calm…