Earth Rotation Parameters Estimation Using GPS and SLR Measurements to Multiple LEO Satellites

Earth rotation parameters (ERP) are one of the key in realization International Terrestrial Reference Frames (ITRF). At present, Laser Ranging Service (ILRS) generates satellite laser ranging (SLR)-based ERP products only using SLR observations to Geodynamics Satellite (LAGEOS) and Etalon satellites. Apart from these geodetic satellites, many low orbit (LEO) satellites observation missions also equipped with retroreflector arrays, produce a large number observations, which used for validation. In this study, we focus on contribution multiple LEO estimation. The Global Positioning System (GPS) current seven (Swarm-A/B/C, Gravity Recovery Climate Experiment (GRACE)-C/D, Sentinel-3A/B) used. Several schemes designed investigate impact improvement, quality single-LEO solutions, combinations. We find that estimation an ambiguity-fixed can attain better result than ambiguity-float orbit. introduction contributes accuracy improvement 0.5%, 1.1% 15% X pole, Y pole station coordinates, respectively. coordinates be improved gradually increase involved length-of-day (LOD) is by 57.5%, 57.6% 43.8%, respectively, when increases three seven. Moreover, combination able weaken orbit-related signal existing solution. LAGEOS Compared solution, leads 0.6445 ms, 0.6288 ms 0.0276 LOD, addition, explore feasibility one-step method, jointly determined, based GPS present detailed comparison between solution two-step