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Quay Crane
Anti-Collision with Navtech N100-AC Radar
Designed
for the exacting demands of Crane obstacle detection systems
The
Navtech crane anti-collision system uses high-resolution radar to
identify hazardous obstructions in the path of the moving crane
boom. Should the crane approach the ship too closely or the ship
drifts towards the crane the system will generate alarms to the
control systems. Unaffected by heavy rain, fog or dust, it operates
effectively in all weather conditions, twenty-four hours a day.Costly
antenna stacks are the first ship items to be found in the path
of the approaching crane boom. The N100-AC will eliminate costly
insurance claims from crane and ship collision. The system ensures
safe operation of the crane during loading/unloading or working
of the back-reach without affecting the operational efficiency.
The radar provides
complete coverage over 360 degrees, these are no missed segments
between measurements as with competing sensors. Specifically designed
for industrial applications Navtech radar systems are field proven
and are operational in Ports, Airports and Mines. The Navtech N100-AC
is designed to measure, with high sensitivity, the range and bearing
of objects in its line of sight. The radar is mounted on the underside
of the crane boom to detect approaching obstructions. With a powerful
ability to discriminate, the system can detect objects from the
smallest whip antenna to a part of the vessels superstructure.
The Navtech
crane anti collision systems has the following features:
The
system has a high probability of detection.
Detection zones are configurable on both sides of the boom.
The system tracks the movement of the crane trolley through the
detection zones to avoid generating false alarms.
The system measures the speed of the crane during long travel and
automatically measures the time to impact in both directions of
travel. Time to impact and distance are used to generate warning
and stop signals.
The system measures the range to the obstacle and the closing speed.
Separate alarms are generated in both directions for slow down and
stop of the crane.
Field proven, Installed and operational.
Simple dry contact relay interface.
Technical
Description
The
radar sensor acquires measurements through a 360-degree arc from
2m to 100m. Multiple measurements are taken within the radar beamwidth,
There are no missed segments as with competing sensor technologies
where thin whip antenna could go undetected. Several radar measurements
are compared to reduce nuisance alarms and improve detection probability,
this gives a probability of detection for a whip antenna at 50m
0.9995 with higher detection probabilities for larger objects.
As the crane
approaches an obstruction, ranging from a small whip antenna to
a part of the ship structure, a relay contact is thrown to alert
the crane control system to slow down at a pre-determined time to
collision. If the crane continues towards the obstacle the crane
is alerted to stop, short of the obstructing structure. The radar
cancels the stop alarm when it detects that the crane long travels
in the reverse direction. Because of the high range resolution of
the N100-AC the crane is able to approach closely to parts of the
ship superstructure without triggering the stop alarm and so operational
efficiency is not effected. The system also tracks the trolley position
as it moves through the detection zones to avoid generating any
false alarm signalsAll Navtech radar sensors have been rigorously
environmentally tested, they are designed for industrial operation
and include in-system error checking and diagnostics. A radar healthy
signal is generated and feeds directly into to the crane control
system, should a sensor error be generated.
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