基于附加参数的跨海高程传递研究

Study on Transoceanic Elevation Transmission Based on Additional Parameters

本文研究了一种基于附加参数的GPS水准测量和重力大地水准拟合测量方法,实现跨越海域的长距离高程基准传递。该方法结合EGM2008地球重力模型和GPS椭球高,确定陆地与岛屿之间的高程基准差异,拟合函数为多项式曲面。在常规方程中采用不同正则化参数的迭代算法,求解病态矩阵,并估计附加参数的精度。通过两桥之间的实际数据验证了该方法的可行性,并获得高程基准参数和似大地水准面模型,实现了长距离高程基准的传递。将计算值与已知值进行比较,结果表明,高差值的不一致性较小。不管有多少差异,都可以精确计算,计算高程的精度可以满足工程要求。因此,该方法可以应用于实际工程中。

In this paper, a method of GPS level measurement and gravity geoid fitting measurement based on additional parameters is studied to realize long-distance elevation datum transfer across the sea area. This method combines EGM2008 earth gravity model and GPS ellipsoid height to determine the difference of elevation datum between land and island. The fitting function is polynomial surface. An iterative algorithm with different regularized parameters is used to solve the morbid matrix and estimate the precision of additional parameters. The feasibility of the method is verified by the actual data between the two bridges, and the elevation reference parameters and the geoid level surface model are obtained, and the transmission of the long-distance elevation reference is realized. Comparing the calculated value with the known value, the results show that the high difference value is less inconsistent. No matter how different, they can be calculated accurately. The precision of calculating elevation can meet the engineering requirements. Therefore, this method can be applied to practical engineering