Testing device for testing a distance sensor operating with electromagnetic waves

A testing device for testing a distance sensor operating with electromagnetic waves, comprising:

• a receiving element for receiving an electromagnetic free-space wave as a receive signal;
• and
• a radiating element for radiating a simulated electromagnetic reflection signal;
• wherein the receive signal or a signal derived from the receive signal is routed via a time delay circuit with a predeterminable time delay, and is thus time-delayed to a time-delayed signal;
• wherein the time-delayed signal or a signal derived from the time-delayed signal is radiated as the simulated reflection signaler via the radiating element;
• wherein the time delay circuit has an analog delay path with a predeterminable time delay and a digital delay path with a likewise predeterminable time delay;
• wherein the analog delay path implements shorter time delays than the digital delay path apart from a possible overlap region;
• and
• wherein an input switch is used to switch the receive signal or the signal derived from the receive signaler either to the input of the analog delay path or to the input of the digital delay path and the signal becomes the time-delayed signal after passing through the connected delay path.