NARROW MULTI-BEAM DEPTH MEASURING SYSTEM

PROBLEM TO BE SOLVED: To highly precisely capture sea bottom information, by correcting a depth measuring position and water depth by a depth measuring sonar on the basis of a ship position, a ship main azimuth, an inclination angle, ship rolling and pitching, a sonic velocity and a sea level. SOLUTION: A real time kinematic(RTK) GPS position measuring device 3 highly precisely measures a ship position from a direction and a distance of a ground base station measured by a radio wave from an artificial satellite, and a ship azimuth is mesured by an azimuth compass 5. A multi-beam depth measuring sonar 6 measures water depth in width of double the water depth by 60 pieces of sound wave transmitters and receivers disposed in fan-shape, a chip motion correction device 8 measures heaving, pitching and rolling, and a sonic velocity sensor 9 measures sonic velocity at arbitrary water depth respectively. In addition, with regard to an inclination sensor, the inclination sensor measuring an inclination angle is arranged on two axes, and the inclination of the transmitter and receiver of a multi-beam depth sonar 6 is mesured. Measured data of each measuring device in which a data recorded file 2 is recorded are processed by a recording data processor 15, a depth measuring position and water depth are corrected and a water depth map, a contour map and the like are prepared and inputted.