SYSTEM FOR DETECTION AND DETERMINATION OF POSITION OF MAN IN DISTRESS Russian patent published in 2004 - IPC

FIELD: life-saving systems. SUBSTANCE: proposed system includes life jacket with light source and transmitters provided with transmitting antennae and on-board apparatus consisting of one measuring channel and two direction finding channels. Measuring channel includes receiving antenna 23, heterodynes 28 and 39, mixers 29, 40 and 61, first intermediate frequency amplifiers 34 and 62, second intermediate frequency amplifier 41, amplitude detectors 42 and 67, recording unit 43, narrow-band filters 51 and 66, phase inverters 52,55 and 58, adders 53,56, 59 and 64, band-pass filters 54 and 57, 90-deg. phase shifters 60 and 63 and switch 68. Direction finding channels include receiving antennae 24 and 25, mixers 26 and 27, first intermediate frequency amplifiers 30 and 31, multipliers 32, 33 and 37, narrow-band filters 35, 36 and 44, delay line 39, phase detector 45, phase meters 46 and 47, frequency meter 50 and arithmetical unit 69. EFFECT: enhanced selectivity and noise immunity of on-board receiving direction finder; facilitated procedure of determination of position of person in distress. 7 dwg