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ange bar
range bar Bold, usually horizontal, failure warning flag
for panel instruments.
range bin Store location in SSR plot extractor; each
range increment on given azimuth has store location from
range 0 to range limit in which detected targets are stored
until end of scan, when each is extracted and, together
with scan azimuth, passed out as a plot.
range error Distance measured from imaginary line
drawn through desired impact point and one drawn
through actual impact point, both parallel and perpendicular
to axis of attack (USAF); distance means
perpendicular distance.
range error probable Distance between two parallel lines
drawn perpendicular to axis of attack and equidistant
from desired mean point of impact between which fall
50% of impact points of independently aimed weapons.
range gate pull-off Basic ECM jamming technique
usually used to pull hostile radar off target and thus
provide infinite JSR for angle jamming; JSRR depends on
many variables and is seldom effective technique when
radar is manually controlled.
range gating Limiting radar or laser to detect targets
only within upper and lower (often narrow) range limits.
range lights Row of green lights marking each end of
usable runway at simple airfield.
range markers 1 Parallel lines, concentric circles or
other fixed graticule on display giving indication of range.
2 Single synthetic echo(es) injected into radar display
timebase to give sharp blip, circle or other clear indication
at selected range.
3 Two upright markers, illuminated at night, placed so
that, when aligned, they assist piloting or in beaching
amphibious craft.
range mean pairs Continuous analysis of peaks and
troughs of variable function.
range octagon Computer-generated octagon around
HUDS sight target which unwinds at rate of one side lost
for each 100 m closure.
range-only tracking System for accurately measuring
vehicle range by phase-comparison technique; vehicle
transponder is interrogated by transmitter and replies are
recorded by three or more widely separated receivers. In
US operated on 387 and 417 MHz.
Ranger Deep penetration of hostile territory looking for
air or surface targets (RAF, WW2).
range rate Ṙ, rate at which range changes, –––
dR
[range
being to a target, or of radar signal, etc].
dT
range resolution Ability of radar to discriminate
(separate) two targets on same bearing but with small
range separation; determined mainly by pulse length.
range ring Any circle or arc on PPI display indicating
range.
range safety officer Person charged with supervising
safety to personnel on range (4) and ensuring that no
object travels beyond range boundary.
range strobe See range markers (2).
range tracking element Radar subcircuit which monitors
received-echo times and operates range gate immediately
before each return is received.
ranging Process of establishing target distance, by radar,
optics/lasers, echo, intermittent, manual, gunfire,
explosive-echo or navigational means.
ranging time Time taken by EM (e.g., radar) signal to
rapid deployment force
travel to target and return, approximately 6.7 μs per km,
10.7 per mile, 12.4 per n.m. (nautical mile).
RANK Replacement alphanumeric keyboard.
rank Position in airline fleet: e.g. * 7 is seventh of type
to be delivered.
Rankine Absolute Fahrenheit scale of temperature, °R
= °F + 459.67, hence K = 5/9R.
Rankine cycle Thermodynamic cycle forming basis of
modern steam plant, including many vapour-cycle
machines for aerospace, all having closed circuit:
boiler/prime mover/condenser/pump/boiler. In space
power systems working fluid is usually metallic vapour, eg
Hg, Cs.
Rankine-Hugoniot Relationship between pressure and
density on each side of plane shockwave (Rankine 1870),
from which p, V and γ for inclined shocks can be deduced.
Ranntac Reduction of aircraft noise by nacelle treatment
and active control.
Ranrap Random-range program (ECM).
Rans Reynolds-averaged Navier-Stokes.
Ransac Range-surveillance aircraft.
Ransu Regional air-navigation service unit.
RANT, Rant 1 Re-entry antenna test (ABRES).
2 Radio-aids navigation tutor, or trainer.
RAO Régiment Aérienne d’Observation (F).
Raob Radio-sonde observation.
RAOC Regional air operations centre.
RAOD Ram-air overboard dump.
RAP 1 Reliable acoustic path (sonar).
2 Resource allocation plan.
3 Reliability analysis program(me).
4 Rocket-assisted projectile (ECM).
5 Radar-absorbent (or absorbing) paint.
6 Radio, or random, access point.
7 Recognized air picture.
8 Rack and pinion.
9 Replacement acoustic processor.
10 Air reconnaissance regiment (R).
11 Repair assessment program (FAA).
Rapcon, RAPCON Radar approach control (FAA).
RAPD Recognized air picture display.
Rapec Rocket-assisted personnel ejection catapult
(Martin-Baker).
Raphael Radar de photographie aérienne electronique;
-TH adds transmission herzienne (F).
RAPID Met. change [esp. significant] expected within
30 minutes.
Rapid 1 Real-time acquisition program of inflight data
(Sikorsky).
2 Retrorocket-assisted parachute inflight delivery.
3 Rugged[ized] advanced pathogen identification
device.
4 Radar passive identification.
Rapid aerostat initial deployment Use of [usually static]
airship[s] with multiple sensors to warn surface force of
guerilla attack (USA).
rapid area supply support Ability to deliver supply/
transport/packaging teams where needed (USAF AFLC).
rapid-bloom Chaff or other ECM dispensed payload
which quickly (within 0.1 s) assumes dimensions or emission
properties resembling those of actual aircraft.
rapid deployment force Military force, usually trained in
amphibious, urban and peacekeeping operations, ready
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