Patent ID: 6211812
Filing Date: 2001-04-03
Classification: G01S

Abstract:
Radar apparatus characterized by:a) means for providing a first modulated signal and for transmitting said signal;b) means for receiving an echo signal corresponding to the transmitted modulated signal, and responsive to said echo signal for providing a signal which includes a modulated echo component and a modulated leakage component;c) means for providing a signal corresponding to an anticipated modulation of the leakage component;d) time delay means for providing a time delayed signal representative of the transmitted signal and delayed by a variable amount of time;e) second modulated signal means including a first receiving mixer and connected to the echo signal receiving means and to the anticipated modulation means and responsive to the modulated echo component and the modulated leakage component of the signals from the echo signal receiving means for providing a second modulated signal;f) return signal means including a second receiving mixer connected to the second modulated signal means and to the time delay means and responsive to the signal therefrom for providing a return signal corresponding to the modulation of the modulated echo component, wherein the time delay means delays the signal representation of the transmitted signal prior to being provided to the second receiving mixer;g) the time delay means providing a signal representative of the modulation of the transmitted signal which thereby corresponds to the first modulated signal which is delayed by a variable interval; andh) means connected to the time delay means and to the return signal means for varying the interval of the delay of the signal representative of the modulation of the transmitted signal to provide a time delayed signal to match the return signal with the time delayed signal.