| 摘要 |
FIELD: radio engineering; updating narrow-band communication systems for radio prospecting and electronic blanketing. SUBSTANCE: proposed system has transmitter and receiver. Transmitter functions to generate narrow-band signal, pseudorandom operating-frequency control pulse, complex parallel and complex phase-keyed signals. Communication system is adapted to noise by changing kinds of signals due to their generation from harmonic components in transmitter and extracting harmonic components from reference signal affected by narrow-band noise in receiver. Transmitter has data source 1, modulator 3, subcarrier generator 4, multiplier 5, band filter 6, first mixer 7, power amplifier 8, transmitting antenna 9, first switch 10, first frequency grid 11, reference-frequency unit 12, signal choice unit 13, and carrier generator 14. Receiver has receiving antenna 15, mixers 16, 20, 24, heterodynes 17, 19, intermediate-frequency amplifiers 18, 21, 25, amplitude detector 22, threshold circuit 23, demodulator 26, second switch 27, delay unit 28, reference signal shaper 29, rejection and switching unit 30, second frequency grid generator 31, synchronizing unit 32, and control unit 33. EFFECT: enhanced immunity of communication system to narrowband noise. 1 cl, 11 dwg |
