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UT Universal Time.
UTC Unit Type Code.
MDA GLOSSARY, VER. 4.0 U
315
UTM Universal Transverse Mercator.
UTTMDS Upper Tier Theater Missile Defense System. See THAAD System.
UUT Unit Under Test (ILS term).
UV Ultraviolet.
UV Electro-
Optics
Technologies/techniques employed by optical sensors in the wavelength
spectrum shorter than visible (e.g., less than 4,000 A).
UVPI Ultraviolet Plume Instrument.
UW Unconventional Warfare.
MDA GLOSSARY, VER. 4.0 V
316
V Volt.
V&H Vulnerability and Hardening.
V&V Verification and Validation. (See Verification, Validation, and IV&V.)
V/STOL Vertical Short Takeoff and Landing [aircraft].
VAFB Vandenberg Air Force Base, CA.
Validation Confirmation that the processes and outputs from a test resource parallel real
world processes and are realistically sensitive to change in the environment,
tactical situation, system design, tactics, and threat.
VAMOSC Visibility and Management of O&S Costs.
VAR Visitor Access Request.
Variability The manner in which the probability of damage to a specific target decreases
with the distance from ground zero; or, in damage assessment, a mathematical
factor introduced to average the effects of orientation, minor shielding, and
uncertainty of target response to the effects considered.
VBO Vertical Burn-Out (velocity).
VCC Voice Communications Circuit.
VCRM Verification Cross Reference Matrix.
VCS Voice Communications System.
VDC Volts Direct Current.
VDD Version Description Document.
VDU Visual Display Unit.
VE Value Engineering.
VECP Value Engineering Change Proposal.
Verification (1) Confirmation that all data inputs, logic, calculations and engineering
representations of a T&E resource accurately portray the characteristics,
calculations, logic, and interactions of the system under evaluation.
(2) The process of evaluating a system or component during or at the end
of the development process to determine whether it satisfies specified
requirements.
VESA Video Electronics Standards Association.
VFR Visual Flight Rules.
VGA Video Graphics Array (Telecomm/Computer term).
VHF Very High Frequency.
VHSIC Very High Speed Integrated Circuit.
MDA GLOSSARY, VER. 4.0 V
317
VIDS Vehicle Integrated Defense Software (USA term).
VIGILANTE Viewing Image/Gimbaled Instrumentation Lab-Analog Neural Three-D
Experiment. VIGILANTE involves building a small computer (ANTE) offering 1/12
Operation Per Second (OPS), using a mixture of experimental three-dimensional
circuitry and commercial components. Project also demonstrates VIRGIL, a
gimbaled airborne sensor with visible, experimental UV and quantum-well IR
cameras capable of tracking targets that can be detected, identified, and
precision-tracked with the ANTE processor.
VIM Vibration Isolation Module.
VINSON Encrypted Ultra High Frequency Communications System.
VIS Visible.
VIS/UV Visible/Ultraviolet.
Visibility Range
(or Visibility)
The horizontal distance (in kilometers or miles) at which a large dark object can
just be seen against the horizon’s sky in daylight. The visibility is related to the
clarity of the atmosphere ranging from 170 miles (280 kilometers) for an
exceptionally clear atmosphere to 0.6 mile (1.0 kilometer) or less for dense haze
or fog. The visibility on an average clear day is taken to be 12 miles (19
kilometers).
Visible Electro-
Optics
Technologies/techniques employed by optical sensors in the visible portion of
the wavelength spectrum.
VLAR Vertical Launch and Recovery (UAV JPO term).
VLF Very Low Frequency.
VLOS Vertical Line of Sight.
VLS Vertical Launch System.
VLSI Very Large Scale Integration.
VLSIC VLSI Circuits.
VLWIR Very Long Wavelength Infrared.
VME Versa Modular European [standards].
VMF Variable Message Format (Telecomm term).
VOX Voice Actuation.
VRI Vanguard Research, Inc., Fairfax, VA.
VTC Video Teleconference.
VTOL Vertical Takeoff and Landing [aircraft].
VTOL-UAV Vertical Takeoff and Landing Unmanned Aerial Vehicle.
VUE Visible Light/Ultraviolet Experiment.
MDA GLOSSARY, VER. 4.0 V
318
Vulcan UK bomber.
VV&A Verification, Validation, and Accreditation.
VVER Pressurized water type nuclear power reactor.
VVIRF Verification and Validation Information Request Form.
MDA GLOSSARY, VER. 4.0 W
319
W/ With.
w/o Without.
W/TD Warning/Threat Detection.
WAA Wide Aperture Array.
WALEX Warfare Analysis Laboratory Exercise.
WAM (1) Worldwide Military Command and Control System (WWMCCS). (2) Wide Area
　
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