Abstract
In this work, two models of precise time transfer are presented, firstly, based on the four-frequency un-combined observations of BDS-3, namely TF-UC1 (B1I/B3I/B2a) and TF-UC2 (B1I/B3I/B1C). Then, TF-UC1 and TF-UC2 time transfer with a receiver clock model are introduced and developed. In TF-UC1 and TF-UC2 models, except for the traditional coordinates, troposphere delay and receiver clock parameters, ionosphere delays are estimated as unknown parameters. In addition, receiver differential inter-frequency bias (IFB) are also estimated as parameters. The standard dual-frequency ionosphere-free model is also presented, named as DF-IF. To assess the performance of the two prosed models, datasets from iGMAS were employed. The experimental results show that the TF-UC1 and TF-UC2 models can be utilized for precise time transfer, with accuracy and stability identical to those of the DF-IF model. Furthermore, the performance of TF-UC1 and TF-UC2 models can be improved significantly by using a receiver clock model. The accuracy of TF-UC1 and TF-UC2 is improved approximately 16.6 and 17.7%, respectively, with the receiver clock model. Furthermore, the maximum of frequency stability is up to 79.4 and 80.3% for of TF-UC1 and TF-UC2.
Y. Ge and S. Ding are the first authors.
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Many thanks go to the IGS, PTB and iGMAS for providing precise orbit, clock products and data.
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Acknowledgments
This work is supported by the National Natural Science Foundation of China (No. 41104021, No. 11173026, No. 41704008 and No. 11703033), Youth promotion committee of CAS and Natural Science Foundation of Shaanxi (No. 2018JQ1020). The authors gratefully acknowledge iGMAS for funding.
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Ding, S., Ge, Y., Dai, P., Qin, W., Yang, X., Yu, Y. (2020). Considering Receiver Clock Modeling in PPP Time Transfer with BDS-3 Triple-Frequency Un-combined Observations. In: Sun, J., Yang, C., Xie, J. (eds) China Satellite Navigation Conference (CSNC) 2020 Proceedings: Volume II. CSNC 2020. Lecture Notes in Electrical Engineering, vol 651. Springer, Singapore. https://doi.org/10.1007/978-981-15-3711-0_36
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