METHOD TO MEASURE DISTANCE TO NOISY OBJECT Russian patent published in 2015 - IPC G01S3/80 

FIELD: measurement equipment.

SUBSTANCE: method includes reception of a hydroacoustic noise signal with a hydroacoustic antenna, target following in the mode of noise direction-finding, spectral analysis of the hydroacoustic noise signal in wide frequency band, detection of distance to the target, the hydroacoustic noise signal is received by halves of the hydroacoustic antenna, they measure mutual spectrum between hydroacoustic noise signals, received by halves of the hydroacoustic antenna; they measure autocorrelation function of this mutual spectrum (ACF); they measure carrier frequency of autocorrelation function F_meas, measure difference between the measured carrier frequency and reference carrier frequency of noise emission signal of the target F_ref, measured at the small distance (F_ref-F_meas), and the distance to the target is detected by the formula D=(F_ref-F_meas)K, where K is coefficient of proportionality, which is calculated as the ratio of measurement of carrier frequency of autocorrelation function by unit of distance in detection of reference frequency.

EFFECT: increased accuracy.

1 dwg