uhf tacsat /dama multi-service tactics, techniques ... - UHF-Satcom.com

data stream into burst-formatted data blocks.
frequency code An 8-bit code that defines the uplink and downlink
frequency pair of a satellite transponder.
frequency-shift
keying
frequency
switched
connection
frequency
switching
frequency
uncertainty
Glossary-16
A form of frequency modulation. In FSK modulation, the
frequency of the carrier is discretely controlled by the
transmitted information bits. In binary FSK, the
instantaneous frequency of a signal is shifted between two
discrete values called the mark and space frequencies.
A time-slot connection on a channel other than the one
where the terminal receives CCOW.
The ability of a terminal to transmit and receive in multiple
channels within the same frame.
The difference between a received signal's expected
frequency and its actual frequency. Frequency uncertainty
results when (1) a difference in frequency between reference
oscillators exists, (2) Doppler effects cause frequency shifts,
or (3) frequency-setting inaccuracies occur.
full-duplex (1) Communications that occur in both directions (transmit
and receive) within one frame. (2) A terminal characteristic
that signifies the capability to simultaneously receive and
transmit rf signals.
gain A measure of amplification. It is the ratio of output,
current, voltage or power to input current, voltage or power,
respectively. Gain is usually expressed in decibels. If the
ratio is less than unity, the gain expressed in dB, is
negative, in which case there is a loss between input and
output.
geosynchronous Refers to an orbit with a period equal to one day. A satellite
in geosynchronous orbit above Earth’s equator stays over
the same point on Earth at all times. Communications
satellites are often put in geosynchronous orbits so that
satellite dishes on earth can remain pointed at the same
point in the sky at all times.
global A network configuration in which relays are present and
data may be routed to a network on another satellite
channel.
ground segment A term that describes that portion of the total
communications satellite system that is situated on the
Earth such as the transmitting and receiving antennas,
signal generating facilities, repeaters, RF receivers and
digital encoding equipment and decoders.
guard group A group of terminals that have a common guard address.
guard list A set of addresses for which a terminal receives services.
guard time Unused time interval within a frame that prevents overlap
of transmissions that could occur due to timing differences