Phase and Envelope of Linear FM Pulsecompression Signals from High-Velocity Targets

摘要

Equations for the phase and envelope of the output signal from a linear filter, matched to the transmitted signal, were derived. The transmitted signal is assumed to have a flat band-limited amplitude spectrum and a linear group delay. The input to the 'matched filter' is the radar echo returned from a moving target whose velocity is essentially constant during the illumination time. It was shown that the returned signal is related to the transmitted signal by a time dilation. The resulting expressions for the phase and envelope are functions which involve Fresnel integrals. Approximations for these expressions were worked out. They were shown to be similar in form to those which are obtained when the returned signal is assumed to be related to the transmitted signal by a Doppler shift. (Author)