影响载体搭载多波束测深系统数据精度的误差分析

Error Analysis of Data Accuracy of Vehicle-Mounted Mutli-Beam Echo Sounder

相对于船载多波束系统而言,载体搭载多波束系统的精度受更多因素的影响。主要包括水下导航定位误差和压力传感器误差,这些误差会影响载体搭载多波束所获取的数据质量,降低所获取的水深精度,不利于进一步的分析和解释。本文分析了几类拖体调查水深的影响因素,并结合近期综合深水调查项目中现场所获取的资料,分析载体搭载多波束数据精度的实际误差,为现场作业和综合分析提供参考和依据。结果表明,作业前的校准工作对载体搭载多波束的数据精度影响较大,而在水深较浅的区域,采用船载多波束的所获取的水深精度较高。

The data accuracy of the mutli-beam echo sounder （MBES） carried on vehicles can be influenced by much more factors than that of the MBES mounted on vessels, which includes mainly the underwater navigation and positioning error and the pressure sensor error. These errors could impact on the quality of the data acquired by the vehi- cle-carried MBES and then reduce the accuracy of the obtained water depth data, which is not conducive to the further analysis and interpretation. Based on the analysis of the factors influencing the water depth data obtained in several types of deep-tow surveys and combining with the field data obtained in a comprehensive deep water survey execu- ted recently, the actual error of the data accuracy of the vehicle-carried MBES is ana- lyzed. The results show that the calibration work prior to the survey has much effect on the data accuracy of the vehicle-carried MBES, whereas in the shallower waters the ac- curacy of water depth data obtained by using a vessel-mounted MBES is relatively high- er. These provide a reference and basis for field operations and comprehensive analyses.