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In this paper, we present the acoustic transceiver developed for thepositioning system in underwater neutrino telescopes. These infrastructures arenot completely rigid and need a positioning system in order to monitor theposition of the optical sensors of the telescope which have some degree ofmotion due to sea currents. To have a highly reliable and versatile system inthe infrastructure, the transceiver has the requirements of reduced cost, lowpower consumption, high intensity for emission, low intrinsic noise, arbitrarysignals for emission and the capacity of acquiring and processing the receivedsignal on the board. The solution proposed and presented here consists of anacoustic transducer that works in the 20-40 kHz region and withstands highpressures (up to 500 bars). The electronic-board can be configured from shoreand is able to feed the transducer with arbitrary signals and to control thetransmitted and received signals with very good timing precision. The resultsof the different tests done on the transceiver in the laboratory are describedhere, as well as the change implemented for its integration in theInstrumentation Line of ANTARES for the in situ tests. We consider thetransceiver design is so versatile that it may be used in other kinds of marinepositioning systems, alone or combined with other marine systems, or integratedin different Earth-Sea Observatories, where the localization of the sensors isan issue.

Development of an acoustic transceiver for positioning systems in Underwater Neutrino Telescopes