【摘要】：針對RTK三維水深測量技術(shù)中GPS大地高需擬合成正(常)高的問題,該文在常規(guī)七參數(shù)轉(zhuǎn)換法的基礎(chǔ)上提出一種基于CGCS2000框架的單橢球七參數(shù)轉(zhuǎn)換方法,有效彌補了二次曲面法在外推擬合GPS高程時精度衰減的不足。該文重點闡述了單橢球七參數(shù)轉(zhuǎn)換法的構(gòu)造原理、流程及其特點,最后通過椒江出�？谒碌匦螠y量項目實例證明:該文算法在擬合精度的內(nèi)插方面不低于經(jīng)典的二次曲面法;外推方面,在椒江口向東海外推超過20km時,仍能保證厘米級的擬合精度,且相比二次曲面法精度高出一個數(shù)量級。
[Abstract]:In order to solve the problem that GPS geodetic height needs to be combined with normal height in RTK 3D bathymetry technology, a single ellipsoid and seven parameter conversion method based on CGCS2000 framework is proposed in this paper based on the conventional seven-parameter conversion method. It makes up the deficiency of precision attenuation when Quadric surface method is extrapolated to fit GPS elevation. This paper focuses on the construction principle, flow chart and characteristics of the single ellipsoid and seven parameter conversion method. Finally, through the example of underwater topographic survey of Jiaojiang River, it is proved that the interpolation accuracy of this algorithm is not lower than that of the classical Quadric surface method; In the extrapolation aspect, when the Jiaojiang Estuary pushes eastward over 20km, the fitting accuracy of centimeter level can still be guaranteed, and the precision is one order of magnitude higher than that of Quadric Surface method.
【作者單位】： 浙江省河海測繪院;河海大學地球科學與工程學院;
【分類號】：P226.3;P228.4

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