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Based on analyzing the situation of current underwater navigation, this paper presents an independent underwater navigation method, namely the terrain matching algorithm based on contour image. Firstly, according to multibeam bathymetric system data, the topographic contours are extracted out from the data and then form contour image. Secondly, the contour used for image matching is coded. The coding...
Seabed topographic match is a very important work for fulfilling the blend of different-source sounding data and the underwater positioning and navigation. Contour match is a classic method for the seabed topographic match. However, the traditional contour match algorithm will lead to obvious time consuming and mismatch, especially in the longer contour match. Thus, a kind of contour match algorithm...
Establishment local marine geomagnetic field model with marine geomagnetic observation is very important for marine research and exploration. Four methods, which are Taylor polynomial, Legendre polynomial, spline surface function and multi-surface function, are introduced into the work. Some key problems in the establishment of the model by the four methods are studied and discussed in the paper....
Tide-independent precise underwater topographic surveying technique is widely used in inshore hydrographic measurement. GPS RTK provides an accurate instantaneous height to transducer in the technique. However the instantaneous height easily suffers the influences of satellite status, vessel attitude and radio transmission and so on and becomes weak in quality. The low-quality instantaneous height...
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