Digital acoustic communication in shallow-water sea for oceanological applications

Results of experiments on slow transmission of digital information using acoustic signals in complex oceanological conditions, i.e., in the presence of multiray propagation and motion of a sound source, are given. Coding with the help of pseudorandom sequences and coherent summation of the signals transmitted along a multiplicity of different rays with different Doppler frequencies and received by different elements of an extended receiving array are performed. The used method provided an opportunity to attain errorless transmission of codes at distances larger than 5 km. A theoretical estimate is given for the probability of an erroneous decision on the value of transmitted codes.