Patent ID: 6639547
Filing Date: 2003-10-28
Classification: G01S

Abstract:
A system for functional testing in a continuous-wave radar, comprising:a transmitter circuit for generating radar transmit signals; a transmit/receive antenna coupled by way of a circulator with the transmitter circuit; a receiver circuit having an input that is coupled to the transmit/receive antenna by way of the circulator, for processing radar echo signals of a target object received at the transmit/receive antenna, the circulator relaying the transmit signals generated by the transmitter circuit to the transmit/receive antenna and splitting off echo signals of the target object received from the transmit/receive antenna, providing them to the input of the receiver circuit; an RPC circuit coupled between the output and the input of the receiver circuit for suppressing portions of the transmit signals split off from the transmitter circuit and/or reflected from the transmit/receive antenna directly into the receiver circuit; a modulator that is contained in the receiver circuit, and connected into the signal path of the control signal, for generating a correction signal compensating the directly split-off portions of the transmit signals; wherein 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 an external source.