Hydroakustyczny system transmisji danych w wodach płytkich z zastosowaniem modulacji MFSK

The paper presents a hydroacoustic system for the transmission of digital data in shallow coastal waters of which multi-path propagation and intense reverberations are characteristic. To ensure a small error probability of moderate speed transmission, the system uses Corrective Hamming's codes and a technique of incoherent modulation MFSK (Multi Frequency Shift Keying). To synthesise the transmission signal, estimate the spectrum of the signal received and code and decode the channels, a DSP processors are used. The paper includes the results of a simulation in which the system was put to work in the presence of Gaussian noise. The system was tested in shallow lake waters and the first results are discussed in the paper.