The present invention relates to a method and apparatus for effectively attenuating and removing various vibration noises introduced from the outside while obtaining a biological signal of a human body using a microwave Doppler radar, (a) IF signal generator The voltage-controlled oscillator (VCO) generates an oscillation frequency of a predetermined period with the voltage ((T(t))) applied from the outside and transmits it to the main part of the dynamic target through a single transmission antenna, and the signal reflected from the dynamic target And receiving various signals generated in the vicinity of the dynamic target in n reception antennas； (b) the IF signal generator generating Doppler IF signals from the received n signals, respectively； (c) an analog/digital converter converting a plurality of Doppler IF signals inputted from the IF signal generator into respective digital data； (d) The digital signal collected for a unit time in the analog/digital converter 20 is composed of a data sequence having symbols at sampling time intervals in a fast Fourier transformer, and the data sequence is a symbol of frequency components of a plurality of indexes. Switching to a symbol set； (e) summing the index symbols converted to the frequency component symbol column in each of the index columns by the operation unit of the signal operator and calculating the value divided by the number of n reception antennas； (f) filtering only periodic signals by classifying the deviation of the spectral components of the aperiodic signals that are common and the aperiodic signals that are not common to the values calculated by the operation unit into threshold values of a certain reference. It is made including. The present invention improves the accuracy of sensing a biosignal in a non-contact method by effectively removing random noise included in the biosignal region by using a Doppler radar for biosignal measurement consisting of a single transmitter and a plurality of receiver
