Correction of Imperfect Alignment of MRU for Multibeam Bathymetry Data
-
摘要: 系统分析多波束勘测时运动传感器偏移造成的姿态误差的特点,以及对波束归位的影响,根据水深误差受横摇误差影响更大、运动传感器偏移带来的横摇误差主要受纵摇决定的规律,借助三维光照水深图、傅立叶或小波分析工具、纵摇与水深误差关系图判断是否存在运动传感器偏移,然后通过消除纵摇与水深误差的线性关系取得运动传感器的偏角,最后对测区所有波束重新归位,完成运动传感器偏移改正,对浅水多波束勘测质量的提高有一定的意义。Abstract: In this paper,we analyzed the characteristics of attitude errors caused by imperfect alignment of the MRU with the reference frame of vessel,and influences on the positions of beams in multibeam survey in detail.In this case,according to the rules that depth error is mainly determined by roll error,and roll error is mainly related with pitch,the 3D sun-illuminated terrain of seafloor,the math tool of Fourier or Wavelet,and the side projection of depth errors are used to confirm whether imperfect alignment of the MRU exists or not.If it exists in multibeam survey,we can obtain the offset angle when the linear relations of pitch and depth errors are disappeared.Finally,all data which are impacted by the imperfect alignment of the MRU will be corrected by the offset angle.It provides a reference for improving multibeam bathymetry,especially in shallow water.
-
Keywords:
- multibeam sonar /
- MRU /
- alignment /
- error
-
计量
- 文章访问数: 1065
- HTML全文浏览量: 80
- PDF下载量: 416
下载:
