Site survey at Sheshan 25 m radio telescope in 2008

In order to develop and improve the strategies of observation and data analysis, to develop software system and to check the precision of parameters, we introduce the site survey at the Sheshan 25 m radio telescope of Shanghai Astronomical Observatory in 2008. This survey is a part of the whole effort to determine the local tie parameters among the stations of VLBI, SLR and GPS at Sheshan. And such parameters are important to the compilation of terrestrial reference frame based on various space geodetic techniques. In this survey there are new tries in several aspects, especially the frame transformation is adopted in the data analysis so as to simplify three-dimensional fitting into planar reduction, which sustains the stability and precision of parameter solutions. The parameter precision is on the millimeter level and which shows the rationality and validity of the strategy and implementation of this survey.