Selective Availability definition of Selective Availability in the Free Online Encyclopedia.

Selective Availability

A function in the GPS navigation system that deliberately introduced random errors for civilian GPS receivers. It was implemented to prevent enemy troops on foreign soil from using the GPS system to their advantage, while allowing friendly troops to obtain the true signals in GPS receivers that supported military encryption. Selective Availability (SA) was temporarily disabled in the Gulf War, because so many U.S. troops were using consumer-grade GPS receivers, and SA was disabled permanently in 2000.

Because of the lack of accuracy for the consumer market, ground-based augmentation systems were created to correct the discrepancies. See GPS augmentation system.

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No references found			This capability, known as Selective Availability (SA), will no longer be present in the next generation of GPS satellites. Department of Defense News Release (Sept, 18, 2007): DoD permanently ... by Defense AT & L Second, secure GPS devices have a selective availability anti-spoofing module (SAASM). The key's the key! by PS, the Preventive Maintenance Monthly Experts attribute the high cost of military receivers to the anti-tamper chip, called the GPS selective availability anti-spoofing module. Defense Dept. studying options to lower cost of GPS receivers by Erwin, Sandra I. / National Defense			selected bidder Selected Council selected list of bidders selected mine selected tenderers selected time selectin selecting circuit Selection Selection and Genetics, Institute of Selection and Seed Production of Vegetable Crops, Institute of selection bias selection check selection coefficient Selection Landscape selection log Selection of Pulse Signals selection pressure Selection Rules selection sort Selection Station selective selective absorption selective acidizing selective adsorbent Selective Availability selective bidding Selective Breeding selective calling selective calling system selective circuit Selective Coating selective cracking Selective Dissemination of Information selective dump selective fading selective filling selective flotation selective forgetting selective fracturing selective fusion selective heating selective identification feature selective inhibition selective interference selective jamming selective laser sintering selective loading selective medium Selective Mining selective permeability			Selective Acknowledgment Selective AD Indicator Selective Address selective adsorbent Selective Aldosterone Receptor Antagonist Selective Alpha Air Monitor selective amnesia selective amnesia selective amnesia Selective Amyloid Lowering Agent Selective Androgen Receptor Modulator selective angiography selective angiography selective angiography Selective Aortic Arch Perfusion Selective Apoptotic Anti-Neoplastic Drug Selective Area Coating Selective Area Laser Deposition Selective Armament Subsystem selective arteriography selective arteriography selective arteriography Selective attention Selective attention Selective attention Selective attention Selective Attention Deficit Disorder Selective Attention for Identification Model Selective Attention Semantic Content Analyzer Selective Auditory Attention Test Selective Availability Selective Availability / Anti-Spoofing Selective Availability Anti-Spoofing Module Selective B-Mode Receiving Station selective bidding Selective Bile Acid Receptor Modulator Selective Bile Duct Ligation Selective Bile Duct Obstruction selective blood agar selective blood agar selective blood agar selective blood agar Selective breeding Selective Broadcast Signaling Virtual Channel Selective Call Acceptance Selective Call Fowarding Selective Call Rejection Selective calling Selective calling Selective Calling System Selective Calling System Selective Catalytic Oxidation of Hydrogen Sulfide Selective catalytic reduction Selective Cell Discard Selective Chopper Radiometer selective circuit Selective Class of Call Screening Supplement Selective Coating Selective Colour to Grey Selective Communication Equipment