尺度比稳健估计及参考椭球参数确定

短程精密测距精度一般优于GNSS测量精度,工程中常用GNSS测量与精密测距方法联合建立高精度工程测量控制网,对两者所存在的尺度差异,常采用尺度比进行统一,其关键是尺度比的合理选择。文中参照精密测距边长确定的实测尺度比相对于理论尺度比的残差,建立空间分布与尺度残差线性关系,对尺度差异进行估计并确定合理的尺度比,再在投影层面将尺度比等价转换成参考椭球参数进行数据归算,从而实现GNSS与精密测距成果的高度融合,得到高精度工程测量控制网的可靠成果。

Robust estimation on scaling-ratio and determination of reference ellipsoid parameters

The precision under precision measurement with short distance is higher than that under GNSS . So generally , combining GNSS with precision measurement , this paper proposes a high precision engineering surveying control network for project .For the scale difference between the two ,scale ratio is used to unify ,and the key is the reasonable choice of scale ratio .Based on the residual of actual scale ratio to theory scale ratio referring to the precision measurement length , the paper establishes the linear relationship between the spatial distribution and the scale residuals ,and estimates the scale difference and determined the reasonable scale ratio .T hen at the projection level ,the scale ratio is equivalently conversed into reference ellipsoid parameters for data imputation ,so as to realize the high integration of GNSS and precision measuring results ,and to receive reliable results of high precision engineering survey control network .