Patent ID: 6680692
Filing Date: 2004-01-20
Classification: G01S

Abstract:
A continuous wave radar system, comprising:a transmitter circuit for generating radar transmitting signals; a transmit/receive antenna, coupled to the transmitter circuit by way of a circulator; a receiver circuit, which is coupled to the transmit/receive antenna by way of the circulator and which is intended to process radar echo signals of a target object, said radar echo signals being received at the transmit/receive antenna, wherein the circulator passes the transmitting signals, generated by the transmitter circuit, to the transmit/receive antenna and diverts the target object's echo signals, which are received by the transmit/receive antenna, to an input of the receiver circuit; and an RPC (reflected power canceller) 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, wherein said RPC circuit comprises a reflection-modulator circuit, wherein said RPC circuit is connected into a signal path between the circulator and the transmit/receive antenna, for the purpose of generating a correction signal, wherein said correction signal compensates for directly diverted parts of the transmitting signal, and wherein the reflection modulator circuit comprises a directional coupler arrangement for coupling out a part of the signal, traversing a 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 coupled signal in the sense of generating the correction signal in response to the control signal, derived from the receiver circuit.