About HIRAYAMA KEIICHI
About 日本無線
About Navigation (Tokyo)
About oceanographic observation
About Radar
About ocean wave spectrum
About sea clutter
About container ship
About wave height
About fast Fourier transformation
About wave observation
About X-band radar
About ocean wave spectrum
About Nautical instruments,navigation systems,electric installation
About Radar
About Ocean waves,tidal current
About 船舶
About レーダー
About 波浪観測