Patent ID: 8681317
Filing Date: 2014-03-25
Classification: G01S

Abstract:
1. A tracking method, in which a target provided with a reflector is tracked by a measurement beam of a laser tracker, comprising the following steps: in a normal tracking mode, in a tracking unit, the measurement beam reflected by the reflector is detected, and a variable for the control of the alignment of the measurement beam is computed from the detection, additionally in an extraordinary tracking mode, in which, in the tracking unit, the measurement beam reflected by the reflector is not detected, variables for the control of the alignment of the measurement beam are computed from data which is acquired by at least one further apparatus, wherein the laser tracker comprises a capture unit and an overview apparatus, wherein the capture unit as well as the overview apparatus have a known position and orientation relative to the measurement beam, the capture unit comprises a detection region which lies between the detection region of the tracking unit and the detection region of the overview apparatus, and wherein the method in the extraordinary tracking mode comprises the following steps: