沿岸多模式GNSS三维水深测量方法研究

在沿岸水下地形测量中,高程控制是难点,在远离岸边的区域,不仅布设潮位站困难,而且潮位站水位改正的精度也难以保证,为提高沿岸水域测量的可靠性和灵活性,在河口区域的水深测量项目中进行了RTK、PPK、PPP3种模式的同步作业方式研究。结果表明,基于GNSS多模式三维水深测量的方法能有效提高水位改正的精度和可靠性。无论测区离岸距离多远,可以同步采用RTK、PPK和PPP的方式进行高程控制,这3种模式的高程测量差值均方差接近0.10m,精度能满足沿岸水域一般比例尺地形测量的高程精度要求。

Research on Three-dimensional Bathymetry Method of Coastal Based on Multi-mode GNSS

In the work of coastal underwater topographic survey,elevation control is difficult.In areas far from the shore,it is difficult to lay tidal stations and to guarantee the accuracy of the water level correction.In order to improve the reliability and flexibility of coastal underwater topographic survey,research on synchronous operation of RTK,PPK and PPP in the bathymetry project in estuary area is carried out.The results show that the method based on GNSS multi-mode three-dimensional bathymetry can effectively improve the flexibility and reliability of water level correction.No matter how far the survey area is from the shore,the methods of RTK,PPK and PPP can be used simultaneously for elevation control.The mean square deviation of elevation measurement among the three methods is close to 0.10m,and the accuracy can meet the elevation accuracy requirements of coastal general scale topographic survey.