利用 RTK 进行多波束水深测量时,GPS 高程在提供瞬时垂直基准方面起着重要的作用。海上实际作业过程中,GPS 信号经常会发生失锁现象,造成部分历元高程数据突变,导致海底地形失真。该文以茂名某项目为例,首先介绍了根据 EGM2008大地水准面模型,利用高程拟合法将多波束水深测量时 GPS 椭球高转换为正常高的方法；然后针对 GPS 信号失锁现象,提出了利用 RTK 高程中的固定解来求算海水潮位面的方法,同时阐述了该方法的优势。%In the period of measuring multi-beam by using RTK technology,GPS elevation plays an im-portant role in providing instantaneous vertical datum.During the actual operation process in the sea,GPS signals often happen the problem of out of lock.It will cause mutations of some epoch elevation data,and distortion of submarine topography.In this paper,setting Maoming project as an example,according to EGM2008 geoid model,by using elevation fitting method,in the process of measuring multibeam bathy-metric,GPS ellipsoidal height will convert to normal height.Then pointing to the phenomenon of losing and locking GPS signals,the method of using elevation fixed solution to calculate sea tide surface by using RTK technology has been put forward.The advantages of this method have been explained as well.
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