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2.5.5
Description
Tracking
Field of view
2.5.6
Description
Field of View
2.5.7
Description
Description of the System
Automatic Target Recognition
The Automatic Target Recognition (ATR) is a sensor which recognises the
position of a reflector by means of a CMOS image sensor. The light beam of
the ATR represents the collimation axis of the Laser Tracker, the reflected
beam is received by the CMOS image sensor. The position of the reflected
spot in relation to the centre of the CMOS image sensor is computed. These
ATR offsets are used to correct the horizontal and vertical angles. The ATR
offsets are also used to control the motors which turn the instrument to
centre the reflected spot closely to the centre of the CMOS image sensor.
a
y
b
x
004680_001
The Automatic Target Recognition (ATR) is capable of tracking a moving
reflector. When a target is within the field of view, the ATR will constantly
measure and apply the offsets to the angular measurements and provide
them to the motors of the Absolute Tracker to track the movements of the
reflector.
The field of view of the Automatic Target Recognition (ATR) is 0.6°, which
corresponds to a spot size of 105 x 105 mm at a distance of 10 meters.
PowerLock
To determine the location of a target, the Absolute Tracker uses an addi-
tional off-axis vision system, which is built into the sensor. As soon as the
target is in the field of view of the sensor, the Absolute Tracker locks on to
the target and steers the laser beam back onto the ATR without operator
intervention.
This revolutionary vision system works with all standard reflectors.
The field of view of the PowerLock vision system is 10°, which corresponds
to a covered area of 1.75 m × 1.75 m at a distance of 10 meters.
Overview Camera
The Overview Camera enables the visualisation of reflectors. This camera
is at the front of the telescope below the aperture of the measurement
a) Centre of reflected spot
b) Zero pixel of the ATR
x, y) ATR offsets
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