PHASE DISTORTION DETECTOR FOR DETECTING PHASE DISTORTION ON A LINEARLY FREQUENCY MODULATED WAVEFORM

摘要

A phase distortion detector is used to detect phase distortion on a pulsed linearly frequency modulated waveform, commonly known as a chirp radar pulse. The detector mixes two differently delayed components of the chirp pulse to produce a constant difference frequency component, from which the phase modulation envelope is recovered to generate an error signal proportional to the phase distortion on the chirp pulse. The detector is utilized with a phase modulator in a feedback arrangement to compensate a chirp pulse dynamically for undesirable phase distortion. The detector is also used in another combination with a phase modulator and an amplitude equalizer to compensate a chirp pulse dynamically for both undesirable amplitude distortion and phase distortion.