| 摘要 |
A continuous wave radar system includes a transmitter circuit for generating radar transmitting signals, a transmit/receive antenna, coupled to the transmitter circuit by way of a circulator, and a receiver circuit, which is coupled to the transmit/receive antenna by way of the circulator and which is intended to condition radar echo signals of a target object. The radar echo signals are received at the transmit/receive antenna, wherein the circulator serves to pass the transmitting signals, generated by the transmitter circuit, to the transmit/receive antenna and to divert the target object's echo signals, which are received by the transmit/receive antenna, to the input of the receiver circuit. The system further includes an RPC circuit for suppressing parts of the transmitting signals, diverted from the transmitter circuit and/or by means of reflection from the transmit/receive antenna directly into the receiver circuit, in response to a control signal, which is derived from the receiver circuit and which contains a reflection-modulator circuit, connected into the signal path between the circulator and the transmit/receive antenna, for the purpose of generating a correction signal, compensating for the directly diverted parts of the transmitting signal. The invention provides that the reflection modulator circuit contains a directional coupler arrangement for uncoupling a part of the signal, traversing the signal path between the circulator and the transmit/receive antenna, and a controllable line termination arrangement, attached to the directional coupler arrangement, for the purpose of setting the reflection and/or the absorption of the uncoupled signal in the sense of generating the correction signal in response to the control signal, derived from the receiver circuit.
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