Abstract
The new high accuracy multisensor hydroacoustic system for models of trawl geometry measurements was designed for developing the construction of cod trawl net for the Baltic fishery. The system consist of 20 miniature hydrophones attached by the light-gauge cables to the measuring microprocessor device and notebook computer. The pulse excitation at high frequency and correlation digital signal processing make it possible to obtain high resolution of measurements. Additionally each of hydrophones is equipped with the thermistor which is used to calculate the local sound velocity and enable precision calibration of obtained measururing data. This method of calibration is particularly important for measurements investigated in the surface water layer with the high temperature gradient. The construction details, the measuring signal processing algorithms as well as examples of obtained data and the accuracy verification will be presented in the paper.
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