Retroreflector with sensor

A reflector arrangement for position determination or marking target points, the reflector arrangement comprising:

• at least one retroreflector, which
• provides position determination for the reflector arrangement by means of parallel measurement beam reflection, and
• provides a passage surface for at least a part of measurement radiation entering the retroreflector, and
• at least one sensor arrangement, arranged downstream of the retroreflector in relation to a measurement beam incidence direction, the sensor arrangement having a sensor for recording measurement radiation passing through the passage surface, the sensor defining an optical axis oriented orthogonally with respect to its detection surface,
• wherein:
• the sensor arrangement includes a code element having a code pattern, and
• the retroreflector, the code element, and the sensor being arranged such that:
• the code element is arranged between the retroreflector and the sensor, and
• an angle-dependent position with respect to the optical axis of a projection of the code pattern onto the detection surface can be determined by means of the sensor.