Patent ID: 6278397
Filing Date: 2001-08-21
Classification: G01S

Abstract:
A radar apparatus comprising: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 connected to the echo signal receiving means and responsive to the modulated echo component and the modulated leakage component of the signals therefrom for providing a second modulated signal;d) return signal means including a receiving mixer connected to the second modulated signal means and responsive to the signal therefrom for providing a return signal corresponding to the modulation of the modulated component;e) time delay means for providing a time delayed signal representative of the transmitted signal and delayed by a variable amount of time wherein the time delay means delays the signal representation of the transmitted signal prior to being provided to the receiving mixer; andf) 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.