SeaModem: A low-cost underwater acoustic modem for shallow water communication

SeaModem is a low-cost underwater acoustic modem developed by AppliCon, a spin-off of the University of Calabria, for shallow water communications. In its default configuration, it operates in the 25-35 KHz frequency range and offers a wide range of selectable features including selectable 2-4-8 FSK modulation tones, error detection and correction algorithms via CRC and Viterbi, selectable power transmission up to 40 W, one-way and two-way range calculation capabilities, network capabilities allowing communications among a maximum of 15 modems in the same area and a host interface via a configurable UART. The paper contains a detailed description of the system and the results of several tests are also provided.