FIELD: measuring equipment.
SUBSTANCE: method for measuring distance comprises sounding signal emission, echo signal reception, discretisation of the received echo signal time realisation, gathering of time realisation of discretised countings with duration T, determination of spectrum of the gathered time realisation, successive gathering of next time realisations with duration T is carried out, shifted by time T/4, the spectrum of the gathered time realisation is determined, the threshold is determiend, successive gatherings are carried out for all the time of emission-reception, correlation coefficient is determined between all successive spectra, and when the coefficient is exceeded more than by 0.5, the successive spectra are memorized with the correlation coefficient of more than 0.5, two successive spectra with maximum correaltion coefficient are chosen, frequencies which exceeded the threshold are determined, frequency value is compared with sounding signal frequency, and if they differ by more than 2/T, the distance is determined by the formula: D=S (t-X)/2, where t is the time counting of the first spectrum, S is the sound speed in the air, and X is determined by the formula 
, where Y1 is the spectral counting amplitude of the first spectrum, Y2 is the spectral counting amplitude of the second spectrum, radial speed of the detected object is determined by the frequency value, if the frequency value and the sounding signal frequency differ by the value of less than 2/T, a number of successive spectra with the correlation coefficient of more than 0.5, and if they are less than 7, the distance is determined by the formula, and if they are more, the distance determination is not carried out.
EFFECT: improved accuracy.
1 dwg
