SATSIMSatellite Simulator
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By deploying a Satsim system on an aircraft, remote-piloted vehicle (RPV), or tethered balloon, it may also be utilized for establishing temporary short-range battlefield communications, or installed on a tower or pole at a seaport to provide a convenient way of checking shipboard satcom equipment on departure and arrival.
A Satsim system consists of a main unit (containing frequency translators, attenuators, antennas, control circuits and peripheral hardware) and a control unit (wired or wireless) that serves as the operator's interface.
Waveguide antennas with low gain (about 6 dBi) are employed to provide wide beam-widths, so that multiple terminals in a nominal 90[degrees] quadrant can simultaneously access the Satsim system.
In a simple representation, a Satsim can best be described as a local oscillator (LO), mixer and antennas for the appropriate uplink and downlink frequencies (see Figure 1).
In order to simultaneously operate on all four satcom bands, the Satsim incorporates considerable isolation in its design, including filtering of the input and output frequency bands in addition to orthogonal waveguide feeds.
A standard Satsim unit includes manual variable attenuators that can be adjusted to control the output level based on a chart supplied with the unit.
from the main Satsim unit via an integral transceiver operating at 900 MHz.
IcVSIM and SATSIM are both based on interval-class vectors, but IcVSIM is sensitive to the "bumpiness" of the vectors and SATSIM alms to flatten them out.