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AIAA-2004-6808-930 - AIAA 2004-6808 USAF Developmental Test...

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American Institute of Aeronautics and Astronautics 1 The Spectrum Encroachment Challenge: Bring It On!!! Saul Ortigoza * and Tim Chalfant Air Force Flight Test Center, Edwards AFB CA 93524 Lane Smail Tybrin Corporation, Fairborn, OH 45324 Abstract This paper addresses the spectrum encroachment challenge and the international outreach efforts for the use of higher frequencies for aeronautical telemetry. Several of the technologies being developed by the Test and Evaluation / Science and Technology Spectrum Efficient Technologies Executing Agent for the Department of Defense are also discussed. Nomenclature dB = Decibel dBm = Decibel-milliwatts Eb/No = Ratio of Energy per bit Eb to the Spectral Noise Density No Hz = Hertz Gbps = Giga bits per second Ghz = Giga Hertz Mbps = Mega bits per second Mhz = MegaHertz us = Microseconds ns = Nanoseconds NM = Nautical Miles ppm = Parts Per Million SER = Symbol Error Rate SNR = Signal to Noise Ratio I. Introduction he Director Operational Test & Evaluation (DOT&E), Department of Defense recognized the need to invest in the Test and Evaluation of future weapon systems and established the Test and Evaluation/Science and Technology (T&E/S&T) Program. This program has several focus areas, one of which is the spectrum efficient technologies. Telemetry allocations to conduct flight testing are strained due to increasing data rate requirements and the loss of spectrum due to reallocation to commercial applications. To address this telemetry challenge, the Spectrum Efficiency Technology Focus Area has been chartered to identify and develop emerging T&E technologies by: 1) Improving the efficiency of aeronautical telemetry systems allocated in the current L, S bands; 2) Researching and developing systems for potential augmentation above 3Ghz (will obtain final approval at the 2007 World Radio Conference); and 3) Implementing “out-of-the box,” innovative approaches to relieve the spectrum encroachment challenge (i.e., optical communication). II. Spectrum Encroachment We won’t belabor the point of the spectrum encroachment challenge. It’s a reality; the aeronautical telemetry community has lost about 30 percent of our spectrum through government auctions. Spectrum is the prime * Executing Agent, 412 TW/ENTI, 307 E. Popson. Chief Instrumentation Division, 412 TW/ENI, 300 E. Yeager Blvd, Building 1600 Module 500. Systems Engineer, Range Operations Group, 2970 Presidential Drive. T USAF Developmental Test and Evaluation Summit 16 - 18 November 2004, Woodland Hills, California AIAA 2004-6808 This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States.
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American Institute of Aeronautics and Astronautics 2 realestate, where billions of dollars are paid for by the commercial sector to provide services like cell phones, satellite radio, television, and so on. The marketplace dictates the value of spectrum. Meanwhile, the information required for Network Centric Warfare is bursting with increased use of spectrum. This, along with the future
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