Extraction of acoustic signal at high-intensity noise

Application of absolute (amplitude) measurement method in hydroacoustics leads to distortion and to loss of information in the infrasonic range, measurement errors as a result of high-intensity noise. The problem of measurement quality in hydroacoustics can be solved using a relative (phase) method of signal transformation. A phase gradient sensor allows to extract a small acoustic signal in presence of high-intensity noise. Other advantages are the following: (1) compensation of dynamic noise, (2) infrasonic signals recept, (3) determining the direction of signal arrival. The paper is devoted to development and application of a phase gradient sensor.