Estimation of ERP with Combined Observations of GNSS and SLR

Objective By selecting different number of IGS tracking stations,ERP parameters are estimated fromGPS observations and the combined observations of GPS and GLONASS,respectively.The influencesincurred by increasing the number of stations and adding GLONASS observations to the estimatedERP parameters are analyzed by comparing results to IGS published values.Thirdly,the ERP param-eters are estimated with SLR data from GLONASS satellites.Finally,ERP parameters are estimatedwith joined results from SLR and GNSS.This research shows that not only that the systematic errorsof ERP or High-frequency ERP estimated from GNSS observations are ameliorated,but also the sta-bility of estimated ERP is improved greatly when using the joined results from SLR and GNSS.