Patent ID: 8179305

Claim:
A method of measuring an impulse response of a pulsed frequency or phase modulated radar signal, the radar signal including a secondary signal and a main signal, the secondary signal being a copy of the main signal, being lower in amplitude than the main signal, and being delayed relative to the main signal, the method comprising the steps of: sampling the pulsed frequency or phase modulated radar signal to produce a time-domain sample record; windowing the sample record to produce a windowed sample record; transforming the windowed sample record into a frequency-domain spectrum; multiplying the spectrum with a complex conjugate of a frequency-domain estimate of a transmitted pulsed frequency or phase modulated radar signal to produce a de-spreaded pulse; transforming the de-spreaded pulse into a time-domain measurement of the impulse response; and correcting an amplitude of the measurement of the impulse response using a correction factor that is a function of the delay of the secondary signal relative to the main signal.