基于LBL的海底管节施工局域控制网建立

Estimating Submarine Control Network Using LBL

针对现有水下定位方法在精度和效率上的不足,提出了一种基于LBL建立海底局部控制网的方法。首先根据对称原则,给出了海底控制网布设方法;其次,给出了圆走航海底绝对基准传递方法和数据处理方法;最后,建立了海底控制网无约束和约束平差模型,实现了控制点绝对坐标的高精度确定。将控制网布设、测量和数据处理方法应用于实际工程,300m水深情况下,取得了优于5cm的定位精度。

The disadvantage of the existing underwater positioning method on precision and efficiency, a method of establishing seafloor local control network based on LBL is put forward in this paper. Firstly, the layout method of seafloor control network is given out according to the symmetry principle ; secondly, the method for absolute datum transfer based on circle-sailing is proposed along with its data processing method;finally, the unconstrained and constrained adjustment model for seafloor control network is constructed in order to accurately determine the absolute coordinates of seafloor control points. Applying the layout, measurement and data processing method for control network in practical engineering, the positioning accuracy superior to 5cm is achieved in the condition of 300m water depth.