Hybrid phase/amplitude monopulse direction-finding receiver

Claim 1

A high-speed sequential lobing direction-finding receiver comprising; input means adapted to receive signals corresponding to the Sigma mode and Delta mode from an RF processor and having a frequency Fs; said signals having phase and amplitude content; oscillator means having outputs F1 and F2 separated in frequency from each other and from Fs; mixing means operatively receiving the signals corresponding to Fs, F1 and F2 and outputting signals corresponding to Fs - F1 and Fs - F2; detector means operatively coupled to said mixing means and operative to output a signal corresponding in frequency to the difference Delta F between F1 and F2; other detector means having inputs coupled to the output said detector means and other inputs coupled to the output of said oscillator means; said other detector means comprising a pair of synchronous detectors; and 90* phase shifter means operatively coupled between said oscillator means and one of said pair of synchronous detector means for phase shifting the signal Delta F coupled from said oscillator means to one of said synchronous detector means; said other detector means receiving signals corresponding to Delta F with amplitude and phase information thereon from said detector means and signals corresponding to Delta F only from said oscillator means and outputting signals corresponding to pitch and yaw.