METHOD OF CLASSIFYING SONAR ECHO SIGNAL Russian patent published in 2012 - IPC G01S3/80 

FIELD: physics.

SUBSTANCE: in the method of detecting a sonar echo signal, obtained sets of discretised readings undergo spectral analysis; the energy spectrum is determined from each set of discretised electrical signal readings; the average of all spectral readings is determined on each set; the spectral reading with the highest amplitude is calculated on each set; in each set the amplitude of the reading is compared with a threshold, which is selected from the average value; if the amplitude of the reading is greater, the spectral width of the echo signal is determined as the number of readings exceeding the threshold; the highest amplitude of the reading, the value of the spectral reading and the spectral width are stored; the value of spectral readings is compared in the next time sets; the amplitude values of spectral readings are compared in the next time sets; the set with the maximum amplitude is determined; the spectral width of the echo signal is determined for the set with the maximum amplitude; a decision is made in favour of an echo signal from a target if the maximum amplitude values of spectral readings match in neighbouring time sets in the range of ±2 readings, spectral width less than 2/T and the maximum amplitude values of spectral readings in neighbouring sets less than the maximum amplitude of the selected set, and the spectral width of neighbouring sets greater than 2/T; otherwise a decision is made in favour of interference.

EFFECT: possibility of distinguishing an echo signal from a target from reverberation and noise interference.

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