SYSTEM FOR DETECTING AND LOCATING PERSON IN DISTRESS Russian patent published in 2012 - IPC B63C9/20 

FIELD: transport.

SUBSTANCE: invention relates to rescue equipment. Proposed system comprises life vest with light sources (1) and (2), power supply (3), cables (4) and (5), cartridges (6) and (7), membranes (8) and (9), levers (10) and (11), contacts (12) and (13), tight air line (14), air chambers (15) and (16), seal rings (17) and (18), transmitters (19) and (20) with transmitting antennas (21) and (22), receiving antennas (23), (24) and (25), mixers (26), (27), (29), (40), (61), (74), (76), (88), (93) and (95), first intermediate frequency amplifiers (30), (31), (34), (62), (75) and (94), multipliers (32), (33), (37), (65), (70), (72), (79), (84), (90), (92) and (100), narrow-band filters (35), (36), (44), (51), (66), (71), (77), (80), (85), (91), (97) and (101), delay line (38), phase detector (45), phase meters (46) and (47), motor (48), reference generator (49), frequency meters (50), (78), (81), (98) and (102), phase inverters (52), (55) and (58), adders (53), (56), (59), (64), (83), local oscillators (28) and (39), +90°-phasers (60) and (63), -90°-phaser (82), band filters (54) and (57), switchers (68) and (87), second intermediate frequency amplifiers(41) and (89), low-frequency filters (42) and (99), registrator (43) and (103), reference frequency units (73) and (96), and logical element OR (104). Proposed system differs from known designs in that it features twofold increase in operating frequency range and limit-type search range without expanding local oscillator frequency tuning range. This results from use of complex frequency-modulated signals received in image channel at w₃ frequency. Note here that said signals are converted at conversion factor used in primary reception channel.

EFFECT: higher efficiency and reliability.

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