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GSD
GSD 1 Graphics system design.
2 Grey- [gray-] scale definition.
3 Ground sample distance.
GSDI Ground speed and drift indicator.
GSE 1 Ground support equipment.
2 Ground swing envelope.
3 Global sensitivity equation[s].
GSF Gross square feet [undesirable].
GSFC Goddard Space Flight Center, Greenbelt, MD
(NASA).
GSFG Group of Soviet Forces in Germany (NATO
name).
GSGA State service of civil aviation (R).
GSGG Gadolinium scandium gallium garnet.
GSI 1 Grand-scale integration (microelec.).
2 Government source inspection.
3 Glideslope indicator.
4 Grid security infrastructure.
GSIF Ground-station information frame.
GSLV Geostationary [or geosynchronous] satellite
launch vehicle (India).
GSM 1 Ground-station module, or mobile.
2 Global-station module.
3 GPS sensor module.
4 Global-systems mobile, or global system for mobile
communications.
GSMC Global system for mobile communications.
GSMS Ground-station management system.
GSN Guidance unit (R).
GSO Geostationary orbit.
GSOC German Space Operations Centre, Oberpfaffenhofen.
GSP 1 Ground service plug ( = socket).
2 Glareshield panel.
GSQA Government source quality assurance (US).
GSR 1 Ground surveillance radar.
2 General Staff requirement (UK, Army).
GSS Ground (or group) support system.
GSSS Gyrostabilized sight system.
GST 1 Greenwich sidereal time.
2 General Staff Target.
3 General skills test (proposed for NPPL).
GSTF Global Strike Task Force (USAF).
GSTP General support technology programme (ESA).
GSTRS Ground safety tracking and reporting system.
GSTS Ground-based surveillance and tracking system
(SDI).
GSU 1 Group Support Unit.
2 Group Standardisation Unit (RAF).
GSV Gray-scale voltage[s].
G-switch Activated by severe acceleration or impact.
GT 1 Group technology.
2 Rate, eg kg/h, of fuel consumption (USSR).
3 Gas temperature.
4 Greater than.
5 Gain/thermal noise ratio, also G/T.
6 Aircraft category, glider torpedo (USAAF 1942–47).
G t Gain of radar aerial (dB).
GTA General terms agreement.
GTACS 1 Ground-target attack control system.
2 Ground-theater air control system (JFACC).
GTAW Gas tungsten-arc welding.
GTC 1 In IFF, group time cycle.
2 Gyro time constant.
guidance radar
3 Ground terminal computer of data-link.
GTDS Ground tracking data station.
GTE Groupo de Transporte Especial [government air
carrier] (Brazil).
GTF 1 Ground test facility.
2 Geared turbofan.
GTL Gas to liquid [fuel].
GTM Ground targeting mode.
GTN Global Transportation Network [web-based
control system, to be upgraded to * 21] (US DoD).
GTO Geosynchronous (or geostationary) transfer
orbit.
GTOW 1 Ground take-off weight.
2 Confusinlgy, gross take-off weight.
GTPE Gun time per engagement.
GTR 1 Gulf Test Range.
2 General technical requirements.
3 Greater.
GTRE Gas Turbine Research Establishment (India).
GTRI Georgia Tech. Research Institute.
GTS 1 Gas-turbine starter.
2 Glider Training School.
GTSIO Geared, turbocharged, direct injection,
opposed.
GTSS Ground-target sensor surveillance.
GTT Ground test time.
GTV 1 Ground-test vehicle (helicopter).
2 Guidance test vehicle (missile).
3 Glide test vehicle.
4 Ground test valve (hydraulic system).
g.u. Gravity unit, standard unit for geophysical and
MAD calculations, = 10 -6 ms -2 .
GUAP, Guap Chief Administration of Aviation
Industry (USSR).
guaranteed rating Minimum power or thrust which
manufacturer guarantees every engine of type will reach.
Guard Category of aircraft of secret type, or containing
secret equipment, requiring armed guard when parked
(UK, WW2).
guard Emergency VHF channel usually monitored as a
secondary frequency by all air and ground stations in
geographical area.
guarded switch One protected against inadvertent operation
by hinged cover or shroud.
guard frequency Guard.
guardroom Police post at entrance to RAF airfield or
other military establishment (UK).
guardship 1 Armed escort helicopter.
2 Planeguard helicopter.
gudgeon pin Links piston to connecting rod (US, wrist
pin).
GUDN Guarnylurea-dinitramide.
GUGVF Chief Administration of Civil Air Fleet, of
which Aeroflot is operating branch (USSR, R).
GUH Get-U-Home.
GUI, G/UI Graphics, or graphic[al], user interface.
guidance Control of vehicle trajectory, esp. that of
unmanned, or of manned but according to external inputs
(see active homing, beam-rider, command *, electrooptical
*, inertial *, IR *, laser *, midcourse *, passive
homing, radar command *, semi-active homing, wire *).
guidance radar One dedicated to providing pencil beam
for beam-rider or radar command guidance or illumination
beam for semi-active homing.
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