Computer aided hydrographic survey and processing system of the survey vessel Shoyo.

A computer aided hydrographic survey system of the survey vessel “SYOYO”has been completed. Positioning, data acquisition, data processing are done by using a computer PANA FACOM U-1200. The computer provides accurate positioning from the integration of the NNSS (Navy Navigation Satellite System), the Loran C, and the other associated navigation sensors In this system, Loran C position is calculated by multi-LOP (Line Of Position）fixing up to 14 LOP’s of 6 hyperbolic LOP’s and 8 range LOP's, and corrected by a unique calibration method. The computer calculates differences between NNSS fixes and Loran C fixes to minimize variance of NNSS fixing, and decides reliable calibration values by a weighted mean method. The data processing programs included in the system produces a bathymetric contour chart, a sounding chart, a track chart and other charts. These charts are very available on conducting survey. As far sounding, the automatic echo sounder occasionally provides erroneous depth data Therefore, we have developed a sub- system to replace erroneous data with interactively re-digitized depth values from analog graphic records of the echo sounder.

Bibliographic Details

Main Authors:	Asada, Akira, Kondo, Tadashi
Format:	Journal Contribution biblioteca
Language:	Japanese
Published:	1987
Online Access:	http://hdl.handle.net/1834/16148
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