平面拟合法校正多波束换能器横向安装偏差

Roll offset calibration of multibeam transducer by plane fitting method

针对多波束测深系统换能器横向安装偏差校正不完善的问题,提出了一种以近似平面估算换能器横向安装偏差的方法。分析了横向安装偏差对海底地形测量的影响,采用选权迭代的方式对子区平坦海底进行平面拟合,以平面拟合系数求解模型作为计算平面方程的推值模型,利用两近似平面夹角确定换能器横向安装偏差,将计算结果带入CARIS软件船配置文件中,完成对换能器横向安装偏差的二次校正。实验结果表明,该法能有效探测换能器横向安装偏差,且经二次校正后的主检测线交叉区域水深值具有较好一致性,满足海道测量规范要求。

For the incomplete calibration of roll offset in multibeam echosounder system transducer, a method with approximate plane to estimate the roll offset of transducer is presented. In the paper, the effect of roll offset on seafloor morphology is analyzed, and the weighted iteration method is used to smooth bottom plane fitting. Regarding the plane fitting coefficient solving model as the plane fitting iteration extrapolated model, the transducer roll offset is determined with approximate plane included angle, and the result is put into CARIS vessel file for the secondary correction of the transducer roll offset. The result shows that the method can detect the transducer roll offset effectively, and depths with secondary correction at main check line crossing area are more consistent, which meet the specifications for hydrographic survey.