两种水下定位方式的误差对比与分析

THE ERROR ANALYSIS OF TWO UNDER-WATER POSITIONING METHODS

利用在富钴结壳海山实测的2条海底摄像测线资料,通过超短基线水下定位数据和LAYBACK方式定位校正结果的分析与对比,结果表明,通过超短基线定位系统的同步测量,可实现对海底摄像拖体的高精度水下定位,而通过LAYBACK校正方式得到的拖体定位数据误差变化范围很大。LAYBACK校正误差受航速和拖缆长度变化的影响程度较小,而受母船航向变化的影响程度要大得多,因此,当利用LAYBACK方法进行水下定位校正的时候,尤其需要注意船向变化对定位精度的影响。

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.