G-2 Saturn B – Chapter 5. Appendices
Geostationary position of satellite approximately 36,000 km above
the surface of the Earth at the equator; satellite rotates with Earth and
therefore appears fixed in space.
Group Calls an EGC service that enables many MESs to receive
same message.
HPA High Power Amplifier
ID Identification Digit(s)
IMN Inmarsat Mobile Number, a unique 9-digit number which identi-
fies each end terminal of Saturn B.
Inmarsat International Maritime Satellite Organisation
IOR Indian Ocean Region.
ISDN Integrated Services Digital Network, digital national and interna-
tional telecommunications network.
ISN Inmarsat Serial Number, individual number assigned to each
Saturn B station.
ITU International Telecommunications Union, international organisa-
tion that oversees and compiles standards for telecommunications.
L Band band of radio frequencies from about 1.5 GHz to 1.6 GHz,
used by the Inmarsat-B links between MES and the satellite.
Latitude distance north or south of the equator, measured in de-
grees.
LED Light-Emitting Diode, semiconductor element that emits light.
LES Land Earth Station, a station that interconnects fixed telecommu-
nications networks with the Inmarsat system; may also be called a
CES (Coast Earth Station) or a GES (Ground Earth Station).
LESA Land Earth Station Assignment Channel
LESI Land Earth Station Interstation Signalling Channel
LHCP Left Hand Circular Polarization
LONG longitude
LNA Low Noise Amplifier
Longitude distance east or west of Greenwich meridian, measured in
degrees.
MCC Mobile Country Code
MCU Main Control Unit, major part of terminal; performs all signal
processing and message handling functions.
MES Mobile Earth Station, a user terminal for an Inmarsat system;
the Saturn M terminal is an MES for the Inmarsat-B system; MES
List of Terms Cont’d
Appendix G – List of Terms Cont’d
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