周波数偏移型レーダトランスポンダの提案-II

概要

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The purpose of this transponder with frequency shift is to detect and identify a small target at close area in bad condition. When we observe the sea using a marine radar, it is sometimes difficult to find weak signal from small target, because the signal is covered with sea clutter. This transponder send modulated radio wave of frequency F+fi after receiving transmitted wave of frequency F from a marine radar. Therefore the signal is distinguished from sea clutter. If the fi is allocated to specific group of vessel, the quantity of fi means the group. Because a normal marine radar can adjust the receiving frequency between about ±30MHz, it is possible to receive the signal from this transponder without change of hardware. This paper describes the effect of this transponder against sea clutter.
社団法人日本航海学会の論文
2000-03-25