To decrease collision disaster, authors examined early detecting of small boats with the enhancement of an Electrical Visualization. Most small boats are made by FRP, but there is few observation on its radar cross section. The authors measured Radar Cross Section (RCS) of small boats. As results, RCS of boats of less than 5 G/T was 6m^2 and RCS of bigger boats was 15m^2. The RCS is not so small, however in actually, it is difficult to detect these small boats by radar. The authors thought that it was difficult to detect small boats even if small radar reflector was installed for them, because big radar reflector is not suitable for them. So the authors make a proposal of a radar transponder operating at out-band of radar frequency band with small output power using solar power cell, communication system and network.
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