THE ERROR ANALYSIS OF TWO UNDER-WATER POSITIONING METHODS

Two kinds of positioning data, which form two deep-sea video recording profiles, on a guyot are analyzed. The results show that high accuracy positioning data could be acquired by the ultra-short baseline system, but the errors of positioning data by LAYBACK correcting method are deeply uncertain. The accuracy of positioning data by LAYBACK correcting method are affected by the variation in vessel course more than by the variation in speed of the vessel and length of the towrope, so, a special attention should be paid to the changes in moving course of the vessel when LAYBACK correcting is carried out.