| 摘要 |
FIELD: radiolocation, possible use in intruder alarm systems as sensor. ^ SUBSTANCE: device contains supporting frequency generator, phase detector, balance mixer, set-point generator, low frequency filter, two antennas, two Doppler mixers, two intermediate frequency amplifiers, phase shifter for 90° , heterodyne, low-noise amplifier, rejecter filter, low frequency amplifier, limiter, two integrators, amplitude detector, comparator, supporting voltage block, alarm signal generator, two multiplexers and two narrowband filters. ^ EFFECT: possible determining of small values of Doppler frequency and its sign and, due to that, increased sensitivity and possible determining of movement direction of object. ^ 1 dwg |
