多波束测深系统内部参数的检测与分析

针对多波束测量换能器校准不完善问题，提出了一种基于加权最小二乘的多波束换能器横摇偏差二次校正方法。基于平坦海底的多波束回波数据，采用加权最小二乘法拟合海底地形，进而计算海底倾角，即可得到换能器横摇偏差角度，将得到的角度偏差作为修正值，对测船模型中换能器横摇偏差进行校正。实验结果表明，较之改正前，校正后的水深数据在条带交叉区域具有较小的不符值，证明校正后的多波束水深数据具有更高的精度。

Detecrtion and Analysis of Multibeam Bathymetric Internal System Parameters

In this paper, a method of re-calibration for roll bias of multi-beam sounding system is proposed to solve the faltiness of multi-beam sunding transducer calibration. Based on the sounding data of smooth terrain, the roll bias angle of transducer, the dip of terrain, can be calculated by using the method of weighted least squares. The obtained bias angle can be used for roll bias correction of transducer in vessel model. The conclusion shows that the corrected bathymetry data in the overlapping area of adjacent two swaths is more consistent than before, the accuracy of multi-beam bathymetry data has been significantly improved.