Fitting model of tropospheric delay in network RTK
QU Xing-hua · Cehui kexue · 2012
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.