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52
2
Chapter 2
Product Presentation
The ACM is comprised of:
•
Inertial Navigation Unit circuit
The Inertial Navigation Unit senses the position and motions
of the vessel and calculates the azimuth and elevation angles
(in the antenna coordinate system) necessary to point the
antenna towards the satellite.
It is made as a “strap down” type placed inside the radome
on the base.
The sensors is solid state (MEMS) accelerometers and rate
gyros.
The sensor inputs to the ACM are:
•
3 axis Rate Gyro (for roll, pitch and yaw)
•
3 axis Accelerometer (for roll, pitch and yaw)
•
GPS
•
Stepper Motor Control circuit
A pointing routine is calculating the pointing direction and
controls the stepper motor drivers.
A special care has be taken when the antenna pointing is
close to gimbal lock, where the wide antenna beam width is
used to reduce fast azimuth motions.
•
Zero reference circuit
The zero reference circuit senses when the antenna element
is in its “zero” position, meaning heading and 0º elevation.
•
Power Supply circuit
Is receiving several power supplies from the HPA, in the
antenna, and is distributing internally in the ACM and to the
MDM, GPS Module and the Zero Reference Board.
Figure 2-51: TT-3050C ADU, Antenna Control Module
• Motor Drive Module (MDM)
also located on the bottom side of
the Top Housing Cover, and contains the Stepper Motor Driver
circuits, which is receiving the step- and direction commands
from the ACM and drive the two (2) Stepper Motors accordingly.
•
The MDM also contains the identity of the antenna in a E
2
PROM
circuit, meaning that it stores the information regarding the type
of Antenna of the SAILOR 150 FleetBroadband.
Содержание Sailor 250 FleetBroadband
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