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airborne radars aircraft altitude return amplitude analog angle azimuth bandwidth beamwidth blind zones boresight carrier Chapter closing rate coefficients cosine cycle decibels detection range detector difference digital signal processor direction distance doppler ambiguities doppler filters doppler frequency doppler profile doppler shift duty factor energy equal fighter Figure filter bank gigahertz ground return hertz high PRF increases increment input integration interpulse period kilohertz length line of sight lobe low PRFs mainlobe clutter maximum measured medium PRF missile modulation noise operation output passband phase phasor positive power ratio processor pulse compression pulse train pulse width quency radar cross section radiation radio frequency radio waves range ambiguities range gate reduced resolution returns received rotation samples sidebands sidelobe clutter signal processing spectral spectrum switching synthetic array target echoes target's doppler frequency threshold tion tracking transmitted pulses true range velocity voltage wavelength zero