AN INTERPOLATION METHOD FOR ZENITH TROPOSPHERIC DELAY
BASED ON HIGHER TAYLOR SERIES EXPANSION
1）Geodetic Data Processing Center，SBSMI，Xi’an〓710054
2）Chinese Academy of Surveying and Mapping，Beijing〓100830
3）National Administration of Surveying，Mapping and Geoinformation，Beijing〓100830
Abstract：A projectionextension method to calculate zenith tropospheric delay(ZTD）of mobile stations was presented. The method is based on the inverse distance weighted fomular derived from Taylor series expansion，and the high order terms were considered. The interpolating accuracy can be improved with the method for the stations located at extremely high elevations. Operation of the method is to project elevation of a station to the mean elevation plane，and to calculate the ZTD of the projection point with the method，then extend it to the actual position using polynomial fitting. An experiment results is done with the GPS data of SCIGN，and the results show that the interpolation method based on higher Taylor series expansion has better performance in calculating ZTD of rover stations than IDW，especially for stations with high elevations. Combined with projectionextension method，it can also get ZTD of rover stations which have extremely high elevation at millimeterlevel accuracy.
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BASED ON HIGHER TAYLOR SERIES EXPANSION[J]. jgg, 2013, 33(6): 155-159.
