| 摘要 |
PURPOSE:To enable easy and accurate detection of positional relation between a ship and coastlines and dangerous obstacles in a very clear manner, by displaying a video diagonally below the water surface and a submarine topographic map in superimposition one upon another on the same screen. CONSTITUTION:A side looking sonar SLS has ultrasonic transmitter/receivers 1 and 2 for right and left sides on the right and left of the bottom of the hull F to allow the searching of underwater videos in a wide range below both sides of the hull F. An image signal giving a video from the SLS and an image signal from a topograph memory indicating a sea bottom topographic map are shown on the same screen of a raster-scan type display unit. The display screen is set in the direction Y (time) and in the direction X (distance) and has N<2> pixels as a whole to display videos on the right and left sides separately in the rage of 0-(N/2-1) and in the area N/2-(N-1) in the direction X. Fixed markers M1 of 0, 150 and 300 (m unit) and a variable marker M<2> for varying display distance are provided on right and left sides respectively from the center. This enables easy and accurate determination of positional relation between the ship, coast lines and dangerous obstacles.
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