Received-signal processing apparatus of a detection device for monitoring at least one monitoring region, detection device and method for operating a detection device

A detection device for monitoring at least one monitoring region for objects by electromagnetic scanning signals, the detection device comprising:

• at least one transmitting device, by which electromagnetic scanning signals generated from electrical transmitted signals, wherein said scanning signals are transmitted into at least one monitoring region;
• at least one receiving device by which electrical received signals are determined from echo signals of at least one scanning signal reflected in at least one monitoring region;
• and
• at least one control and evaluation device, which comprises at least one frequency analyzer for the frequency analysis of the electrical received signals,
• wherein at least one received-signal processing apparatus has a plurality of functionally parallel frequency filters with at least partially different frequency passbands and at least one frequency filter (FFi) has at least one frequency labeling means, by which the passed received signal that is passed through said at least one frequency filter is labeled with a frequency feature that characterizes the frequency passband of the at least one frequency filter that passes it.