| 摘要 |
FIELD: physics, computer engineering.SUBSTANCE: signal demodulation system relates to demodulation of a phase- or frequency-modulated signal and can be used to detect a moving object. The signal demodulation system comprises: a complex demodulator (110) having a first input (111) for receiving a phase-modulated input signal (Si) and designed to perform complex multiplication of said signal with approximation of the inverse of the phase modulation value; a spectrum analyser (130) which receives the demodulated multiplied signal, generated by the complex demodulator (110), and capable of analysing the frequency spectrum of the demodulated multiplied signal, and a modulation controller (140).EFFECT: determining the exact frequency of a specific signal component in a received signal with multiple components.15 cl, 14 dwg |
