近海海域垂线偏差的测量试验及精度分析

Surveying Experiment by Using Digital Zenith Camera and Analysis Between Different Methods in Coastal Aera

为深入研究垂线偏差在海域的精度水平,在我国渤海近海区域利用数字天顶仪及精密单点定位技术测量获得了若干高精度垂线偏差测量值,利用测量值对EGM2008模型、Jason-1卫星数据、DTU10海面高模型及点质量模型计算得到的垂线偏差进行了比对分析。以测量结果为基准,比较结果表明,EGM2008模型的计算结果相对较好,Jason-1卫星数据和点质量模型次之,DTU10海面高计算结果较差。以长岛观测点为代表,EGM2008模型、Jason-1卫星数据、点质量模型计算的垂线偏差与数字天顶仪测量获得的垂线偏差的差异(子午和卯酉两个方向)在1. 5″以内。

In order to study the accuracy of vertical deflection,the surveying experiment is made in Bohal area by using digital zenith camera and precise point positioning technique. The high accuracy surveying values of vertical deflection are used to validate the other values derived from EGM2008 model, Jason-1 satellite data, DTU10 sea surface height model and point-mass model. The comparison results show that EGM2008 model has the better accuracy and DTU10 sea surface height model has the worse accuracy when comparing the surveying values. In coastal area, as a representative of Changdao , the EGM2008, Jason-1 satellite data and point-mass model have the big difference about 1.5＂ when comparing the surveying values.