Abstract: Disclosed is a geodetic target object comprising at least one reflector surface, a receive channel with a detector (18) for receiving electromagnetic radiation (ES) transmitted by a measuring unit (2?), and a transmit channel with a radiation source (13?). The associated transmission port and/or reception port is/are integrated into the reflector surface or is/are embodied so as to adjoin the reflector surface such that radiation (RS) that is modulated for transmitting data can be transmitted in the direction of the measuring unit (2?) within the cross section (5?) of the radiation (ES) generated by the measuring unit (2?).

Abstract: Disclosed are a method and a system for determining the position of a receiver unit. According to said method, modulated radiation is generated by at least one radiation projector, and a number of reference points, from among which reference points lying within a detection range of the receiver unit are detected, are projected by means of said modulated radiation. Positional data, particularly location data and/or orientation data, is derived for the receiver unit from the radiation of said reference points.