GPS高程拟合方法精度分析

近年来人们往往利用GPS数据来确定大地高,但大地高不同于正常高,为此,利用多项式拟合与地球重力场模型相结合的数学方法,使GPS所测大地高通过这些数学模型直接转换为具有厘米精度的正常高,将该方法得到的正常高与单独利用多项式拟合和地球重力场模型得到的结果进行了比较,其差值的标准差为±38 cm。

Precision research on the data fitting method of GPS RTK height

Recently using GPS to determine the geodetic height,but geodetic height is different from normal height represented the height,for this reason we used mathematic model that combine polynomial fitting with gravity field model to determine geodetic height by the GPS,through these mathematic models,that can be transformed into a normal height with cm-level precision.Furthermore,the factors affecting height transformation and error sources by GPS single point positioning are analyzed by certain tests.The modeled geoid heights were compared with the observer ones derived from normal height and other results data that applied to the construction of Hulin are geoid.The test results show that the standard deviation of the difference is 3.8 cm.