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

equesting party The address of the I/O port initiating a call.
return channel
control orderwire
A TDMA slot used by the terminals to (1) request, from the
channel controller, access to the waveform; (2) respond to
channel controller requests with information such as status
and configuration; and (3) transfer computer data to other
terminals.
return orderwire The OW used to transmit control and status information
from network terminals to the channel controller and
perform system support functions, including ranging.
satellite A body that revolves around a larger body.
satellite footprint The area of the earth's surface from which terminals are
able to access a particular satellite.
segment A portion of a frame allocated to users for communicating.
The segment is further divided into time periods called timeslots.
service A specified set of information-transfer capabilities provided
to a group of users by the DAMA system.
shaped binary
phase-shift keying
shaped offset
quadrature phaseshift
keying
A form of BPSK modified to produce the phase-shift over a
period of time. For example, in 50 percent shaped binary
phase-shift keying, the phase-shift occurs over a period of
time equal to one-half a bit period.
A form of offset quadrature phase-shift keying modified to
produce phase-shift over a period of time. For example, in
50-percent shaped offset quadrature phase-shift keying, the
phase-shift occurs over a period of time equal to one-half a
bit period.
slant range The one-way distance between a satellite and a terminal
within the satellite's footprint. (Because signal propagation
velocity is constant, terminals measure range in units of
time.)
slave channel A DAMA channel (5- or 25-kHz) used only for user
communications and not for reception or transmission of OW
or system support messages. Channel timing is derived
from synchronization with the CCOW on the control
channel.
slot connect A connection between a terminal's I/O port(s) and a
communications slot in a TDMA frame.
slot number A 5-bit code that identifies a time-slot when operating in the
AC mode.
solar flare An explosive release, marked by a sudden brightening near
a sunspot or prominence, of electromagnetic radiation and
huge quantities of charged particles from a small area of the
solar surface.
solar wind A stream of particles accelerated by the heat of the solar
corona (outer region of the sun) to velocities great enough to
Glossary-21