Paradigm shift of underwater echo sounding technology III—Evaluation of paradigm shift echo-sounder

Underwater echo sounding technology was developed 65 years ago and has been applied to various systems such as fishfinder, bathymetry, sonar, side scanning sonar, multi beam echo sounding system and synthetic aperture sonar. We have suggested a new concept that may change the history of underwater echo sounding technology, should be called as “Paradigm Shift.” In the conventional system, the transmission intervals are always longer than the time of the round trip distance to the target divided by the underwater sound velocity. By adapting our new “Paradigm Shift Echo-sounder” into the system, the transmission intervals can be decided except for depending on a target and it will be possible to conduct a bathymetry survey that transmits 100 times per second. The system utilized the 7th order Gold code sequence signals. Transmitting signal is the phase modulated and four cycles of carrier signals as one bit of the Gold code sequence. The actual sea trial experiment was done by the proto type of “Paradigm Shift Echo-sounder.” The experimental result was obtained by the transmission of 100 times per second at the depth of 10 to 80 m sea bottom. We also confirmed that this system could reconstruct a high-resolution echogram of the artificial reef.