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GEOSS
phere plus hydrosphere. Above * lies atmosphere, and at
interface is found almost all biosphere zone of life.
GEOSS Global Earth Observation System of Systems
[2005–] (U.N., int.).
geostationary altitude That at which body is in geostationary
orbit. Accepted value is c35,880 km, 22,300
miles.
geostationary orbit Orbit in which satellite remains over
same point on surface of Earth. Thus, period = 24 h; V is
3.07 kms -1 , 1.91 miles/s.
geostationary satellite Satellite in geostationary orbit;
also called synchronous satellite.
geostrophic wind Wind the direction of which is determined
by deflective force due to Earth’s rotation.
geostrophic wind speed Calculated from pressure
gradient, air density, rotational velocity of Earth and latitude,
but neglecting curvature of wind’s path.
geosynchronous Revolving at same angular speed as
Earth, generally synonymous with geostationary.
GEP 1 Glassfibre/epoxy/PVC foam sandwich.
2 Geographical envelope protection.
GEPA, Gepa Groupement d’Etudes de Phénomenes
Aériens (N adds ‘Non-identifies’) (F).
Gepna, GEPNA Groupe Européen de Planification de
la Navigation Aérienne (Int.).
Gepta, GEPTA Group of experts on air-transport
policy (Int.).
GERB Geostat Earth radiation budget.
germanium Silver-white, hard, brittle element
possessing properties of both metals and non-metals; used
in transistors, LEDs and IR windows (8–14 microns), but
being superseded. Symbol Ge.
gerotor Generator-rotor.
gerotor pump Gear pump in which spur gear having n
teeth rotates inside internal ring gear having n + 1 teeth.
GES 1 Ground Earth station.
2 Ground exploitation station [S adds subsystem].
3 Global exploration strategy [2007-] (Int.).
Geschwader Luftwaffe formation equivalent to RAF
group or US wing; also naval squadron (G).
GET 1 Ground elapsed time.
2 Ground entry terminal [Elint].
get To remove gas from vacuum system by sorption.
GETA Graphite-epoxy/titanium/aluminium.
get-away speed Airspeed at which seaplane or flying
boat becomes entirely airborne.
GETI Ground elapsed time of ignition.
Gets GPS-enhanced theater support (US).
getter Material or device for removing gas by sorption.
GEU Guidance electronics unit.
GEV Ground-effect vehicle (usually = ACV).
GEW Ground-effect wing.
GEWP Generic electronic-warfare platform [pilotless
aircraft for testing missile countermeasures].
GF 1 Gold film.
2 Ground fog.
3 Geospacial Force (US).
G F In flight control, noise filtering.
gf Gram[me] force, = 9.80665 × 10 -3 N.
GFA Gliding Federation of Australia [Essendon, Vic.].
GFAC 1 Ground forward air controller, ie not airborne.
2 Government furnished active countermeasures.
GFAE Government-furnished avionic (or aeronautical
or aerospace) equipment (US).
GIB
GFDEP, GFDep Depth [thickness] of fog, estimated in
feet.
GFE Government-furnished equipment; supplied by
DoD to industrial contractor for incorporation in aircraft
or other large product.
GFET, G-fet G-force environmental training.
GFH Groupement Française de l’Hélicoptère [office, F-
75016 Paris] (F).
GFI 1 Government-furnished information (US).
2 Ground fault interrupter.
3 General format identifier.
GFK, GfK Glass-reinforced plastics (G).
GFL 1 Gesellschaft zur Förderung der Luftschiffahrt
(G).
2 Gravity feed line.
G-Flops Billions of Flops.
GFM Government-furnished materiel (US).
GFMC Global Fire Monitoring Centre, an agency of
ISDR [Freiburg, Germany] (Int.).
GFP Ground fine pitch.
GFPT Geospacial Force planning tool (US).
GFRP Glass-fibre reinforced plastic[s].
GFS 1 Gesellschaft zur Förderung der Segelflugforschung
(G).
2 Global fire-support system (Litton).
GFSK Gaussian frequency-shift keying.
GFT 1 General flight (or flying) test.
2 Generalized fast transform.
GfW Gesellschaft für Weltraumforschung (German
national space society).
GF-X Global Freight Exchange (London office).
GG 1 Gravity gradient.
2 Gas generator.
3 Gyro-angling gain.
4 Graphics generator.
5 Ground-to-ground [usually between controllers].
GGG Gadolinium gallium garnet.
GGP GPS guidance pack [age].
GGR Ground-to-ground router.
GGS 1 Gyro gunsight.
2 Gravity-gradient satellite.
3 GPS ground station.
GGTFM Ground/ground traffic-flow management.
G/GV Glove and glove vane.
GH General [or ground] handling.
GH 2 Gaseous hydrogen.
GHA Greenwich hour-angle, difference in longitude
between heavenly body and 0° meridian. D adds difference,
read off Godsave tables.
GhAF Ghanaian Air Force.
ghost Extra images or blips on radar, TV or other
display caused by signal reflection from hills, buildings or
other objects; usually to right of primary image at distance
proportional to reflected and direct path lengths.
GHQ General headquarters.
GHW Ground-handling wheels.
GHz Gigahertz, billions of cycles per second.
GI 1 Gum inhibitor.
2 Government issue (US).
3 Group identifier.
GIA 1 Glideslope intercept altitude.
2 Ground instructional airframe.
GIB 1 Guy in back, ie navigator or other back-seater in
tandem two-seat military aircraft.
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