大地水准面对双星定位精度影响研究

Study of the influence of geoid on double star positioning accuracy in ocean

讨论了双星定位的4种定位计算方法，研究大地水准面对双星定位精度影响规律，并与采用参考椭球模型得到的定位坐标值进行比较，在北纬20～30°区域，海面高度变化为4m时，北斗定位精度的变化约为8m。证明大地水准面对双星定位精度有较大的影响，考虑潮汐等海面因素能有效提高双星定位精度。

This paper discusses four computation rules of double star positioning system based on its working principle. The influence of geoid on double-star positioning on the sea is studied and compared with the accuracy of positioning without geoid N. In the area of 20°N～30°N, the positioning precision changes eight miles while the sea height changes four miles, which shows that the influence of geoid is larger. Therefore, with the sea tides and other factors taken into account, the positioning precision can be effectively enhanced.