FIELD: physics.
SUBSTANCE: lock has a locking device, a key, contact, thermal radiator, heater, photodetector, signal analyser, key hole, electronic switch and transmitter. The transmitter has a master oscillator, modulation code generator, phase manipulator, power amplifier and transmitting antenna. The control point has a receiving antenna, high-frequency amplifier, reference voltage generating device, phase doubler, first and second narrow-band filter, phase doubler, phase detector, recording unit, frequency detector, trigger and a balance switch.
EFFECT: invention increases accuracy of synchronous detection of a received phase-shift keyed signal through detection and elimination of sign ambiguity.
2 cl, 3 dwg
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