Atlas IP+ Terminal User Manual
Page 11 of 106
3 MAIN UNITS
The terminal includes the following main units:
BDU
ADU
3.1 Above Deck Unit (ADU)
The ADU is a maritime-based 3-axis controlled antenna. The antenna is self-tracking
based on patented beam squint technology. The simple and robust electromechanical
system, with one motor per free axis, provides full coverage in azimuth and elevation.
Tracking is accomplished by measuring signals being continuously broadcast from the
satellite.
The radome covers the antenna equipment, which is composed of:
Antenna Unit
RF and GPS circuit
Rotary joint
Antenna pedestal
The antenna unit includes LNA (low noise amplifier), HPA (high power amplifier) and
tracking receiver circuitry to ensure communication even in adverse circumstances.
All signals (and DC power) shall pass through a single coaxial antenna cable, which
connects the ADU to the BDU.