Acoustic remote sensing of currents at the shelf of the Sea of Japan

Acoustic-hydrophysical testing of a shallow site in coastal waters of the Korean Strait

“…Their goal was to study specific features of the forma tion and interaction of hydroacoustic and hydro physical fields using broadband pseudorandom sig nals. Sensing the marine environment with such sig nals makes it possible to obtain a pulse response of the propagation channel with exact time reference of individual pulses and to use it for measuring and monitoring the fields of currents and temperature [1,2]. The same signals can be used in navigation and communication systems on autonomous underwater vehicles (AUVs) of various purpose.…”

“…The possibilities of using complex signals for acoustic thermometry of the bottom layer of an aquatic area under tidal forcing were investigated for the case of deployment of emit ting and receiving systems at depths from 3 to 8 m. The time resolution of the pulse response structure makes it possible to evaluate the method's sensitivity to variations in temperature of less than one degree and, in the future, to successfully use for measuring the velocity of sea currents based on a counter prob ing technique [2]. We have shown experimentally that an AUV can be positioned in a given aquatic area accurate within 1 m when operating in the bot tom layer.…”