DEVICE FOR FINDING TYPE OF PHASE-SHIFTED SIGNALS Russian patent published in 1994 - IPC

FIELD: instrumentation engineering. SUBSTANCE: device has aerial 11, local oscillator 22, two mixers 3, 30, two filters 4, 31, three frequency multipliers 5, 7, 9, three band-pass filters 6, 8, 10, laser 11, collimator 12, four modulators 13-16, four lenses 17-20, four photodetectors 25-28, two phase inverters 29, 32, multiplier 34, narrow-band filter 35, amplitude detector 36, key 37, adder 33. EFFECT: enhanced noise immunity thanks to insertion of new symptoms, increased selectivity by suppression of false signals (noises) received over additional channels. 3 dwg