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adar range
intensity, persistence and shape of cultural and natural
features of specific area (USAF).
radar range Commonly means distance at which particular
object can be detected with (1) 100% reliability or
(2, more usual definition) 50% reliability.
radar ranging Use of radar to obtain continuous input
of target range.
radar receiver Ambiguous term when used alone; can
mean receiver of radar that also transmits, or passive
equipment used in ESM, ECM or radar warning.
radar reconnaissance Reconnaissance using radar(s) to
determine nature of terrain and enemy activity.
radar reflectivity As in optics, fraction of incident
radiation reflected by target, normally measured on unit
area perpendicular to radiation. Modified by radar
camouflage and RAM (2).
radar response Visual indication on radar display of
signal transmitted by target following radar interrogation.
radar return See radar echo.
radar scan See scan.
radar scanner Radar aerial (antenna) able to scan.
radarscope Radar display in which information is
presented visually for human assessment.
radarscope overlay Transparent overlay for comparison
and identification of radar returns.
radarscope photography Film record of radar display
[cassette giving way to CD].
radar screen Radar display.
radar separation Radar service in which air traffic is
spaced in accord with established minima.
radar service Monitoring, navigation guidance or separation.
radar signal film Film on which are recorded all signals
acquired by a coherent radar and viewed or processed
through optical correlator to permit interpretation.
radar signature See signature.
radar silence Imposed discipline prohibiting transmission
by radar on some or all frequencies.
radarsonde, radar-sonde Meteorological facility in
which balloon carries instrumentation recording
temperature, pressure and other atmospheric data which
are transmitted when triggered by secondary radar whose
observation of balloon position when related to time and
known rate of ascent gives wind velocities at different
heights.
radar surveillance Radar observation of given
geographical area or airspace for purpose of performing
radar function, eg traffic control or defence.
radar target designator control Automatically moves
acquisition symbology to bracket target prior to lock-on.
radar tracking station Radar facility with capability of
tracking moving targets.
radar track position Extrapolation of aircraft future
position by computer based upon radar information and
used by computer for tracking.
radar vector Heading (course to steer) issued as part of
radar navigation guidance.
radar weather echo intensity Scale of six levels of intensity
giving rough idea of likely turbulence (NWS).
Radat Freezing-level data.
RAD/BAR Radio/pressure altimeter, or selector switch
between both.
radial staging
RADC Rome Air Development Center, New York state
(USAF).
Radcon Rapid detection of concealed time-critical
targets.
RADE Receive antenna distribution equipment.
Radel Trade name for resins and thermosetting plastics
(Amoco).
Radex 1 Rapid-deployment exercise.
2 Ground-based calibrated transmitter/receiver for
testing navaids.
rad-hard Hardened against radiation, especially from
NW.
Radhaz Radiation hazard.
radiac Adjective meaning radioactivity detection, indication
and computation; applied to radiological
instruments and equipment.
radiac dosimeter Measures aggregate ionising radiation
received by that instrument.
radial 1 Piston engine whose cylinders are arranged
radially, like spokes of wheel; unlike rotary, cylinders
fixed, propeller driven from crankshaft.
2 Magnetic bearing extending from point-source
navaid, eg VOR, Tacan, Vortac; usually QDR.
3 Tyre [tire] construction in which rubber casing is
coated with ply cords arranged transversely and extending
to but not under the bead, stabilized by stiff circumferential
belt.
radial cancellation Methods of reducing propeller or
propfan noise by sweeping [usually back] the blades.
radial compressor Centrifugal compressor.
radial displacement Distortion of tall buildings in lowlevel
reconnaissance photos.
radial drill Machine tool having drill chuck carried on
pivoted radial arm of variable length.
radial driveshaft In a gas-turbine engine, this transmits
the drive fromn the mainshaft or internal gearbox to the
external accessory gearbox; it also transmits cranking
torque during starting.
radial engine See Radial (1).
radial error Distance between desired point of impact of
munitions and actual point, both points projected and
measured on imaginary plane perpendicular to munition
flightpath.
radial error probable That circle drawn on radial error
plane through which 50% of actual munitions pass, with
centre at projected target position.
radial flow Fluid flow inwards or outwards along
substantially radial path, usually outwards in supercharger
or centrifugal compressor and inwards in *
turbine.
radial flyability Unquantifiable measure of ease with
which pilot can accurately hold radial (2), esp. when near
station; varies with terrain-induced errors and other
factors which distort or otherwise influence signals.
radial GSI, RGSI Replaced DME in many aircraft;
essentially DME panel instrument with inbuilt wind
correction facilitating choice of FL giving best ground
speed.
radial staging 1 Gas-turbine or reheat combustor with
fuel fed selectively to two or more rings of burners at
different radii from engine axis.
2 Rocket vehicle able to shed stages at different radii
from major axis.
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