User's Manual

SBS-900 Shore Based Radar Systems
Chapter 7: Remote operation instructions
KH-1602-2 issue 1: Standard SBS900 Systems Operator & Maintenance Handbook
Page 71 of 240
Transceiver operating states
The following table shows the various operation states of the SharpEye
TM
transceiver.
The antenna will rotate regardless of the transceiver state.
Operation state Description
OFF Power is not applied to the transceiver which is switched OFF.
Initialise
On completion of initialisation the transceiver switches to standby or, if any of
the self-test checks fail, to fault state.
The system initialisation typically takes 30 to 40 seconds after which time the
system becomes available for operation.
Standby
In standby the transceiver establishes communication with the Radar
Distribution Unit and reports its status.
The transceiver receives and acts on commands from the RDU.
In Standby the antenna rotates but the system does not transmit.
Transmit
When a RUN command is received from the Radar Distribution Unit and
ACP/ARP signals are present, the SharpEye
TM
transmits.
The transceiver initially outputs at low power. The radar returns are then
processed enabling the VSWR to be checked without the risk of damage to the
transceiver.
If the VSWR is within limits then the transceiver automatically switches to full
power.
If the VSWR is high, indicating an antenna fault, a warning message is sent to
the Radar Distribution Unit and the transceiver enters the degraded Low
Power state.
Degraded
(Low power)
The transceiver continuously runs background performance checks on forward
power, reverse power, receiver sensitivity and temperature. If any of these
parameters falls outside predetermined levels a warning message is sent to
the Radar Distribution Unit indicating the nature of the fault.
The transceiver continues to operate, but with reduced performance and
functionality.
Fault
If the performance or functionality is degraded such that the transceiver cannot
operate it enters the fault state and a fault message is sent to the display
equipment.
The transceiver stops radiating RF and there is no video output to the Radar
Distribution Unit.
A spurious fault may be cleared by re-powering the equipment.
Communication
error
If communication is lost between the Radar Distribution Unit and the
SharpEye
TM
, the RDU reboots the SharpEyex leading to a potential 20
second gap in coverage.