## 5 Conclusions  
In this paper, a seven-day dataset of HY-2B/2C/2D satellite-borne GPS data was carefully selected for analysis. Initially, data quality was assessed, taking into consideration factors such as satellite visibility, data integrity rate, multipath error, and elevation angle, among others. Subsequently, the phase center variation (PCV) model was estimated using both the direct method and the residual method. Finally, precision orbit determination was executed using the reduced dynamic method, and the accuracy of the orbit determination results was rigorously scrutinized through overlapping orbit validation, an orbit comparison with CNES, SLR validation, and SLR 3D validation. 1. The \"HY2_Receiver\" demonstrated exceptional data quality, with 95.5% of epochs observing five or more satellites. The data loss rates for L1 and L2 bands were 3% and 5.5%, respectively, and the average RMS for MP1 and MP2 were 0.36 m meters and 0.24 m, respectively. 2. The estimation of the PCV model using both the direct and residual methods yielded nearly identical results when applied to orbit determination. This led to a reduction in the carrier phase residual by 0.4 to 0.6 mm during orbit determination. When compared with the CNES orbit, the 3D RMS was reduced by 3 to 4 mm, signifying a substantial enhancement in orbit determination accuracy. 3. The internal accuracy validation was conducted through overlapping orbit assessment, and the 3D RMS of the overlapping arc consistently remained within 2 cm. Comparisons with CNES-provided orbits revealed 3D RMS values within 3 cm. The selection of SLR core stations, based on the Monthly GLOBAL report cards from ILRS, led to validation accuracies within 2.5 cm. The validation accuracy of all SLR NP data was within 3.5 cm. The SLR three-dimensional validation method was used to evaluate the orbit, with results in the R, T, and N directions mirroring those of the CNES orbit intercomparison, and a 3D RMS of less than 3 cm. Methodology, [PERSON] and [PERSON]; software, [PERSON]; validation, [PERSON] and [PERSON]; formal analysis, [PERSON], [PERSON], and [PERSON]; investigation, [PERSON]; data curation, [PERSON]; writing--original draft, [PERSON] and [PERSON]; writing--review and editing, [PERSON]; visualization, [PERSON]; supervision, [PERSON] and [PERSON]; funding acquisition, [PERSON] and [PERSON]. All authors have read and agreed to the published version of the manuscript. This research was funded by National Natural Science Foundation of China (grant Nos. 42274006, 42192535, and 42242015), and the Postdoctoral Fellowship Program of China Postdoctoral Science Foundation (Grant No. GZC20231019). **Data Availability Statement:** Satellite-borne GPS data are obtained from the NSOAS ([[https://osdds.nsoas.org.cn](https://osdds.nsoas.org.cn)]([https://osdds.nsoas.org.cn](https://osdds.nsoas.org.cn))). GPS satellite orbits, clocks, and Earth rotation parameters are provided by the CODE ([[http://ftp.aiub.unibe.ch/CODE](http://ftp.aiub.unibe.ch/CODE)]([http://ftp.aiub.unibe.ch/CODE](http://ftp.aiub.unibe.ch/CODE)) (accessed on 1 January 2020)). SLR station data and SLR tracking data are obtained from ILRS ([[https://cddis.nasa.gov/archive/slr/products/resource/](https://cddis.nasa.gov/archive/slr/products/resource/)]([https://cddis.nasa.gov/archive/slr/products/resource/](https://cddis.nasa.gov/archive/slr/products/resource/))(accessed on 1 January 2020); [[https://ilrs.gsfc.nasa.gov/network/system_performance/global_report_cards](https://ilrs.gsfc.nasa.gov/network/system_performance/global_report_cards)]([https://ilrs.gsfc.nasa.gov/network/system_performance/global_report_cards](https://ilrs.gsfc.nasa.gov/network/system_performance/global_report_cards)) (accessed on 1 January 2020)). CNES precise orbit ephemeris data are downloaded from CNES ([[https://aviso-data-center.cnes.fr/](https://aviso-data-center.cnes.fr/)]([https://aviso-data-center.cnes.fr/](https://aviso-data-center.cnes.fr/))).