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152
TPS-System 1000-2.3.1en
© Leica
Automatic Target
Recognition ATR1
resolution modes
The accuracy with which the position of a prism can be
determined with Automatic Target Recognition ATR1 is
dependent on the internal accuracy of the ATR1 itself,
and on the external accuracy, which is affected in
particular by the type of prism and by the ambient
brightness. The external accuracy is attained if the
measurement is repeated at intervals.
The internal accuracy of the ATR1 depends on the
resolution of the CCD camera, on the time for the
measurement, on the condition and position of the
prism, and on other factors; it is the accuracy
obtainable under optimum conditions at one particular
time.
Generally, the accuracy of the ATR and of the angle
measurement are the same. Under a certain distance,
however, ATR accuracy predominates. That distance is
determined by the angle accuracy of the instrument.
The external accuracy of a prism-position determination
is important to the user and is +/-2mm in the standard
EDM measuring mode for Leica circular prisms or +/-
1mm in the precision EDM measuring mode. For the
360° reflector it is +/-5mm each for the transverse and
vertical component.