提高GPS高程拟合模型精度的有效方法

An Effective Method for Improving the Accuracy of GPS Elevation Fitting Model

在调兵山地区,选择76大地高和正常高都已知的点作为原始数据,采用多项式拟合加权平均法建立该地区大地水准面,包括泰勒二次多项式加权平均法和双二次多项式加权平均法。通过实例发现,泰勒二多项式曲面加权平均法和双二次多项式加权平均法对高程异常的短波项有很好的改进效果,拟合残差值比较大的点采用泰勒二次多项式曲面加权平均法和双二次多项式加权平均法残差值变小,大大提高了拟合模型的精度,改善了拟合模型。

In Diaobingshan area, by using 76 point which acquires geodetic height by GPS positioning technology known as the raw da- ta, we create a mathematical geoid model by polynomial fitting weighted average method, including Taylor polynomial weighted average method and double secondary polynomial weighted average method. The result of examples illustrates that this two methods have good improved effect in elevation abnormal shortwave term. The residuals which are relatively large of points become small by the two meth- ods, greatly improve the accuracy of the fitting model and make the fitting model better.