Hydrophone calibration in the presence of reflecting elements with the use of matched spatial filtering

A method of determining the parameters of sources of reflected waves is considered. The method is used for precise free-field hydrophone calibration. It is based on expanding the dependence of the transfer impedance of the projector and the hydrophone on the distance between them in the spatial functions of sources of spherical waves. The expansion of the dependence of the transfer impedance is performed with the use of the matched filtering. It is shown that the method makes it possible to determine not only the parameters of a remote source, which is related to the underwater structure of the standard, but also the parameters of a closely located source formed by the hydrophone itself. The location of the source formed by the hydrophone determines the possibility of a precise calibration of the hydrophone in a standard calibration tank with specified dimensions of the working zone.