Nov 17 2008

Modernization of GPS with new civil signals, and new GNSS constellations that will offer a much larger number of satellite navigation signals, bring new capabilities for navigating airplanes.

The Federal Aviation Administration (FAA) initiated the GPS Evolutionary Architectural Study (GEAS) in late 2006 to plan future navigation architectures, with the goal of creating an architecture capable of providing a service to bring airplanes within 200 feet of the ground anywhere on the globe. The architecture of choice will have implications for near-term planning for the Wide Area Augmentation System (WAAS) and the Local Area Augmentation System (LAAS) and their potential incorporation of the new signals.
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Nov 17 2008

Destruction or degradation of the GPS constellation or its integrity would be catastrophic, and means must be provided for the ever-increasing sets of equipments and ammunition systems that depend on GPS for their functionality. Pseudolites produce GPS-like signals and have been under consideration for various situations. A major difficulty with pseudolites is the near-far problem, where the coverage range is generally limited due to the dynamic range limitations of commercial GPS receivers. We have considered several other issues in designing our software-radio based pseudolite, including the coexistence of the pseudolite (PL) signal alongside GPS with use of a pulse-blanked participative receiver.
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