Appendix A - List of Abbreviations
15Oct99
Page -71
unwrapping but can track the satellite in any position above the horizon. The antenna is
connected to the transceiver through a single coaxial cable to ensure simple installation. The
antenna connector type is TNC Jack 50 Ohm.
The sensors in the antenna are:
•
3-D compass (magnetometer) which measures the earth magnetic field vector
•
2-D inclinometer which measures the vessel roll and pitch angles
•
Gyro which measures the vessel yaw, pitch and roll rates.
The sensor stabilisation of the antenna pointing compensates for the fast movements of the
vessel. In case of a no signal situation the sensors are able to point the antenna
independently, but in all other situations a step-tracking algorithm maximises the strength of
the received signal.
The antenna has two modes of normal operation:
•
Step-tracking mode. During the step-tracking mode the platform tracks the satellite using
the sensors and the step-tracking algorithm. If synchronism with the satellite is lost for
more than 130 seconds the sky-scan mode is entered for re-acquiring synchronism with
the satellite.
•
Sky-scan mode. The sky-scan mode is automatically entered during initial acquisition of a
satellite after power-up, when a different satellite is selected by the user or the signal has
been lost for more than 130 seconds. During a sky-scan the antenna pointing is moved
over the sky from horizon to zenith in a smooth spiral movement, stabilised by the
sensors, searching for a particular satellite. When the satellite is found the antenna exits
the sky-scan mode and enters step-tracking mode.
H
H
ANDSET AND
ANDSET AND
C
C
RADLE
RADLE
The handset is standard equipment in the TT-3064A Capsat Marine Telephone. A 2.5 m
coiled cable connects the handset to the cradle unit.
The cradle unit connects to the electronic unit with a screened multiple-core cable of 2
meters. Two-wire phone/fax socket and data interface are located in the cradle unit, allowing
the electronic unit to be stowed away.
The layout of the handset is shown to the right.
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Страница 151: ...Appendix L Spot Beam Coverage 15Oct99 Page L 21 Figure Figure 6 6 8 8 Indian Ocean Region Indian Ocean Region ...