Abstract: The invention relates to systems for the detection and identification (and/or differentiation) of objects for use in vehicles (stationary usage is also conceivable, e.g. to combat crime, building protection), wherein objects are detected and identified via ultrasound signals. In particular, the differentiation of pedestrians and cyclists from cars and fixed obstacles such as walls is of key focus. Ultrasound sensors are hereby used. By processing the signals and comparing them with reference signals, a differentiation between living and non-living objects is possible.