北斗地基增强系统在GNSS三维水深测量中的应用

Application of National BDS Augmentation System in GNSS three-dimensional bathymetric survey

GNSS三维水深测量是长江河道勘测的重要测验要素,其中,三维定位方法更是关键技术。传统的单基站RTK等手段在日常生产中效率不高,在汉江固定断面测量中,对利用千寻北斗地基增强系统获取精确三维定位数据并用于GNSS三维水深测量的方案进行了验证,并对结果进行了分析。分析表明:北斗地基增强系统测得的水面高程稳定性与单基站RTK相近,河底高程可靠性也达到了与传统验潮法相当的水平,可以满足三维水深测绘的相关要求。

GNSS three-dimensional bathymetric survey is an important measurement element of the Yangtze River channel survey,and three-dimensional positioning method is its key technology.The traditional single base station RTK and other means are not efficient in routine work.In this paper,GNSS three-dimensional bathymetric survey scheme of using accurate three-dimensional positioning data obtained by land-based Qianxun Beidou Augment Sys⁃tem is verified,and the results are analyzed.The results show that the stability of water surface elevation is similar to that of single base station RTK,and the reliability of river bottom elevation reaches the same level as that of tradi⁃tional tide measurement method,which meet the relevant requirements of three-dimensional waterway mapping.