摘要
为了拟合网络RTK中用户端双差对流层延迟,本文分析了基于距离的线性内插模型(DIM)、线性内插模型(LIM)原理,提出了指数拟合模型:以主参考站为原点,系数项与用户端和辅参考站间夹角成反比,指数底数值为0.35,用户端到主参考站与辅参考站到主参考站间距离比值被1减为指数。通过分析上述模型的误差系数给出了模型优缺点,试验验证了指数模型的有效性和稳定性:卫星拟合精度一般优于2cm,实现了单历元平面定位精度优于2cm,高程精度优于3cm。
In order to mitigate double-difference tropospheric delay for the user station from the reference stations,this paper compared the interpolation methods in detail,and described EXPonential model as follows：the master station as the origin,the coefficients is inversely proportional to the angle between the user station and the reference station,exponential constant value is 0.35,the ratio between the distances of the user station to the master and the reference station to the master reduced by 1 as exponential parameter.The advantages and disadvantages of DIM and LIM were discussed on coefficients from the reference stations.Test data from CORS of one city was used to evaluate the performance of the interpolation methods.The numerical results showed that the proposed exponential model could significantly reduce the double-difference tropospheric delay at the user station,the interpolation accuracy could be better than 2cm,the one epoch position accuracy of plane and height could be better than 2 cm and 3 cm.
出处
《测绘科学》
CSCD
北大核心
2012年第1期182-184,共3页
Science of Surveying and Mapping
关键词
双差对流层延迟
基于距离的线性内插模型
线性内插模型
指数模型
double-difference tropospheric delay
Distance-based Linear Interpolation Method（DIM）
Linear Interpolation Method（LIM）
EXPonential model（EXP）
