Abstract
Single-difference (SD) ambiguity resolution (AR) and track-to-track (T2T) AR are two typical AR methods in precise orbit determination (POD) for Low Earth Orbit (LEO) satellites, which could improve the accuracy of orbits greatly. In this study, SD AR and T2T AR methods are introduced and analyzed. The performance of these two methods is assessed by three months of GPS observations from the Gravity Recovery and Climate Experiment Follow On (GRACE-FO) twin satellites. Results show that T2T AR is highly dependent on the stability of receiver hardware delays, while SD AR requires Fractional Cycle Bias (FCB) or Integer Recovery Clock (IRC) products. We find that these two methods have comparable performance in Reduced Dynamic Precise Orbit Determination (RDPOD), while SD AR slightly outperforms T2T AR in Kinematic Precise Orbit Determination (KPOD). We also find that SD AR has a higher AR success rate than T2T AR. Therefore, we recommend SD AR as the top choice in LEO orbit determination, and T2T AR can be a good alternative when FCB or IRC products are not available.
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Data availability
The CODE precise orbit and clock products can be found from the Web site of IGS data center of Wuhan University via ftp://igs.gnsswhu.cn/pub/gnss/products/mgex/. The GRACE-FO data are provided by JPL via ftp://rz-vm152.gfz-potsdam.de/. The SLR tracking data are obtained from ftp://cddis.gsfc.nasa.gov/pub/slr/data/, and the F10.7 data and geomagnetic data are from ftp://ftp.swpc.noaa.gov/.
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Acknowledgements
Thanks to IGS, CODE, and ILRS for providing GNSS data, precise products, and SLR data. Thanks to JPL and GFZ for providing GRACE-FO data. Thanks to SWPC/NOAA for the F10.7 data and geomagnetic data. This research was funded by the National Natural Science Foundation of China (No. 41704030), Natural Science Innovation Group Foundation of China (No. 41721003), and National Science Fund for Distinguished Young Scholars (No. 41525014).
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Zhou, X., Chen, H., Fan, W. et al. Assessment of single-difference and track-to-track ambiguity resolution in LEO precise orbit determination. GPS Solut 25, 62 (2021). https://doi.org/10.1007/s10291-021-01103-4
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DOI: https://doi.org/10.1007/s10291-021-01103-4