Methodology for the combined computation of earth rotation parameters with consideration of coordinate accuracy
In response to the issue of differences in the weight ratio of the earth rotation parameter,which is one of the necessary parameters for space target navigation&positioning,in the joint calculation process of VLBI and BDS,this article uses VLBI and BDS data from the same period to calculate the station coordinates and earth rotation parameters.The results indicate that for station accuracy,the station accuracy obtained by continuously encrypting observation data using VLBI is lower than the solution results of BDS.However,under the same observation conditions,the accuracy of the earth's rotation parameters obtained based on VLBI observation data is better than the calculation results of BDS.Based on the calculation accuracy of the rotation parameters,the weight factor for joint calculation is determined.The weighted processing of the earth's rotation parameters further improves the accuracy of the calculation results compared to a single BDS observation data,with an increase of about 20％in polar displacement accuracy and about 13％in UT1-UTC accuracy.
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