Research on the Method of GPS Height Conversion Based on Terrain Correction

Abstract

In this paper, through the surface of polynomial fitting precision analysis, obtains fitting after converting precision for normal height is mainly affected by the rate of change vertical deflection and higher order termsalso influenced by local terrain correction. The undulating topography is deduced and the calculation formula of cause height anomaly, this method is applicable to the complex terrain of area, will dividend increase formula one of the smaller constant, the calculating process of the intermediate results are returning to normal range, effectively avoid the central region of the singular integral. In the terrain change large region, attend to the influence of terrain correction, the surface fitting method for elevation conversion, can effective improve GPS elevation fitting the precision of the conversion.