HELICOPTER RADIOTECHNICAL COMPLEX FOR DETECTING "BLACK BOX" WITH ALARM OF CRASHED AIRPLANE Russian patent published in 2017 - IPC H04K3/00 G01S3/34 

FIELD: radio engineering, communication.

SUBSTANCE: helicopter radiotechnical complex comprises onboard equipment and the "black box" with the alarm, and the onboard equipment comprises an antenna device, a receiver, a bearing device, an analyzer of received signal parameters, a device of memorizing and processing the received information, a telemetry device, receiving devices, adjustment units, local oscillators, mixers, the first intermediate frequency amplifiers, an engine, a reference generator, a detector, a delay line, the second intermediate frequency amplifier, multipliers, narrowband filters, delay lines, phase detectors, lowpass filters, phase shifters at 90°, squarers, an adder, a threshold unit, phase meters, wherein the "black box" contains a GPS-signal receiver, a receiving antenna, a duplexer, a local oscillator, a mixer, an intermediate frequency amplifier, a demodulator, multipliers, a narrowband filter, a lowpass filter, a computing unit, a modulating code shaper, a delay line, a pseudorandom sequence generator, an adder, a phase manipulator and a power amplifier at 65. The listed means are implemented in a certain way and connected to each other.

EFFECT: increasing the efficiency and reliability of detecting an aircraft that has suffered a catastrophe, by using two additional direction-finding channels and a "black box" with alarm.

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