SYSTEM FOR DETECTING AND LOCATING HUMAN SUFFERING DISTRESS IN WATER Russian patent published in 2014 - IPC B63C9/20 

FIELD: rescue operations.

SUBSTANCE: system comprises a lifejacket on human and equipment placed on board of the helicopter. The lifejacket comprises light sources (1) and (2), a source (3) of energy, the membranes (8) and (9), the levers (10) and (11) with contacts (12), (13), the air cavities (15), (16), transmitters (19), (20), the transmitting antennas (21) and (22). The equipment placed on the board of the helicopter, comprises the receiving antennas (23), (24) and (25), mixers (26), (27) (29) (40) (61), oscillators (26) and (39), amplifiers (30), (31), (34), (62) of the first intermediate frequency, multipliers (32), (33), (37), (65), the narrowband filters (35), (36) (44), (51), (66), (72), (73), the delay line (38), the amplifier (41) of the second intermediate frequency, the amplitude detectors (42), (67), (74), (75), the unit (43) of registration, the phase detectors (45), (79), the phase meters (46), (47), the engine (48), the reference generator (49), the arithmetic unit (50), the phase inverters (52), (55), (58), the adders (53), (56), (59), (64), (81), the phase shifters (60), (63) for 90°, the key (68), the calibrator (69), the adjustable phase shifters (70), (71), subtractors (76), (82), the filters (77), (80) of low frequencies, the unit (83) of dividing, the threshold unit (84), the trigger (85), the generator (86) of counting pulses, the AND gate (87), and the counter (88) of pulses.

EFFECT: increased accuracy of determining the distance from the helicopter to the person suffering distress in water.

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