Patent ID: 9674423
Date: 2017-06-06
CPC Classifications: G01C,G02B,G06T,H04N

Claim:
1. A surveying apparatus, comprising a base, a support pivotable about a first axis relative to the base, a targeting unit pivotable about a second axis relative to the support and comprising a telescope optical unit—defining an optical beam path—comprising at least one objective and a motorized-adjustable focusing optical unit and also an eyepiece and/or a camera chip for recording an image through the objective, goniometers for measuring pivoting positions of the support and the targeting unit, an electro-optical distance measuring device, an evaluation and control unit, which provides a calibrated autofocusing functionality for automatically setting the focusing optical unit in a manner dependent on a target distance measured by the distance measuring device and contains for this stored calibration coefficients with regard to focusing optical unit positions to be set in a target-distance-dependent manner, and at least one second focusing means for focusing—independently of a distance measurable by the distance measuring device—a sighted target by adjusting the focusing optical unit, wherein: a recalibration functionality for the target-distance-dependent autofocusing functionality, said recalibration functionality proceeding at least partly automatically and being provided for implementation in the field, wherein for the recalibration functionality a sequence of N, where N is greater than or equal to two, targetings—to be carried out progressively—of a respective i-th target, where i runs consecutively from one to N, with respective focusing performed via the second focusing means and distance measurement is defined and for this corresponding sequence information is stored in the evaluation and control unit, and wherein in the context of the recalibration functionality in a manner automatically controlled or carried out by the evaluation and control unit for every i-th of the N targetings in response to a respective i-th trigger, after targeting has been performed and focusing of the i-th target has been performed via the second focusing means, automatically an i-th distance is measured by the distance measuring device and an i-th actual position of the focusing optical unit is detected and, respectively assigned to one another, they are added to a measurement data set, and automatically on the basis of an evaluation of the measurement data set with regard to coherence of the i-th distances and i-th actual positions of the focusing optical unit that are respectively assigned to one another with the focusing optical unit positions to be set in a target-distance-dependent manner in the context of the autofocusing functionality, the stored calibration coefficients are checked.