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Based on the FMCW radar principle a mobile measuring unit simultaneously measures the distance to all modulated active reflector units that are within the range of the base station. This work elaborates on a specific implementation of such a remote positioning system, whose transponder units (tags) are simply attached to various measured objects. The main advantages are the low costs of the mobile units, the high update rate, which is possible in this kind of system, and low power consumption. In contrast to the conventional self-positioning LPR-system it is now possible to measure many mobile tags at the same time in real-time and to build up cell structures in widely ramified buildings.
Wiebking et al. (Tue,) studied this question.