| 摘要 |
A system for functional testing in a continuous-wave radar having a transmitter circuit for generating radar transmit signals, a transmit/receive antenna coupled by way of a circulator with the transmitter circuit, and a receiver circuit whose input is coupled with the transmit/receiver antenna by way of the circulator, for processing radar echo signals of a target object received at the transmit/receive antenna. The circulator relays the transmit signals generated by the transmitter circuit to the transmit/receive antenna, and splits off echo signals of the target object received from the transmit/receive antenna to the input of the receiver circuit. An RPC circuit coupled between the output and the input of the receiver circuit suppresses those portions of the transmit signals that are split off from the transmitter circuit and/or reflected from the transmit/receive antenna directly into the receiver circuit. The receiver circuit includes a modulator connected into the signal path of the control signal, for generating a correction signal compensating the directly branched-off portions of the transmit signals. According to the invention, the modulator generates a test signal equal to a radar echo signal suitable for the functional testing in response to a control signal fed from the outside.
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