The impact of differences between ITRF2008 and ITRF2014 on GNSS data processing

In view of the problem that the old reference frame is insufficient in GNSS data processing,the data and the quality,the parameter model and the distribution rationality of the new ITRF2014 are improved,this paper analyzed the differences of the coordinates,baseline length and horizontal velocity field of the stations under the framework of ITRF2008 and ITRF2014 in order to provide a reference for the current high precision GNSS data processing.The results showed that the differences in the X,Y andZdirections were in millimeters after transformation,the average of the baseline differences was within 1 mm;The maximum value of the horizontal velocity field was 5.75(mm·a-1),the minimum was -4.88(mm·a-1),the average was -0.45(mm·a-1),and the average of the difference in the direction was 0.02 rad.The differences in the reference frame were negligible for general engineering,but must be considered for CMONOC for seismic monitoring.