Figure 1-25.—AN/SMQ-11 dual frequency array antenna.
subsystems, the main subsystem, the communications
module subsystem (COMM MOD), and the satellite
module subsystem (SAT MOD). Each subsystem
consists primarily of a laptop computer that can be
used as a stand-alone system, depending upon mission
requirements. The main subsytem contains a multiple
application software library dedicated to many aspects
of METOC support. The IMOSS comes equipped with
a printer.
The SAT MOD consists of a laptop computer that
contains a built-in satellite receiver and processor. It
also includes a VHF receiver/demodulator and two
antennas. One antenna is an omnidirectional antenna
used to copy APT signals and the other is used to copy
signals from the WEFAX broadcast. The SAT MOD is
equipped with special software modifications that can
be used independently from the main IMOSS
computer. Satellite imagery received via the satellite
module may be transferred to the main IMOSS
computer by using a 1.44MB data disk. All com-
ponents are equipped with protective cases (fig. 1-26).
Because the APT antenna is omnidirectional, no
antenna aiming is required to track polar-orbiting
satellites or geostationary satellites. When the system
is powered up, the receiver will automatically scan
satellite frequencies, detect imagery signals, and
acquire the imagery. The WEFAX antenna must be
manually oriented toward the geostationary satellite
during initial setup of the system. For planning, the
system contains software that displays orbital
predictions and line-of-sight receiver ranges for the
polar-orbiting APT and geostationary satellite
WEFAX transmissions. Menu options on the liquid
crystal display (LCD) screen guide the operator
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