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Enhanced orbit determination for formation-flying satellites through integrated single- and double-difference GPS ambiguity resolution

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Abstract

The formation-flying technique is a fundamental concept for earth observing satellite missions, which usually require both absolute and relative orbit accuracies. Their precise orbit determinations are usually exclusively performed based on spaceborne GNSS data, where integer ambiguity resolution (IAR) plays a crucial role in achieving the best orbit accuracy. However, it is found that single-receiver IAR by resolving the single-difference (SD) ambiguities between GNSS satellites at each individual formation-flying satellite cannot achieve the same relative orbit accuracy that is attained by double-difference (DD) IAR between formation-flying satellites. To unravel this problem, 1 year of GPS data collected by the Gravity Recovery and Climate Experiment (GRACE) mission are used and four types of orbits are derived for comparison: (1) orbits where no ambiguities are fixed; (2) orbits where SD IAR is performed for both satellites; (3) orbits where only DD ambiguities between the twin GRACE satellites are resolved; (4) and orbits where SD IAR is carried out on only GRACE A while DD IAR is further accomplished between the twin satellites, namely the integrated SD IAR and DD IAR solutions. They are then evaluated through comparison to the reduced-dynamic orbit generated at the Jet Propulsion Laboratory, residual analysis of satellite laser ranging (SLR), and K-Band ranging (KBR) measurements. As expected, the integrated SD IAR and DD IAR solutions can achieve the highest absolute and relative orbit accuracies simultaneously. Specifically, SLR residuals in case of the integrated IAR are reduced by at least 25% for the kinematic orbit, when compared to the case of DD IAR. KBR residuals in case of the integrated IAR are reduced by 35 and 16% for the dynamic and kinematic orbit, respectively, when compared to those of SD IAR. Importantly, we find that errors in GPS clocks and/or narrow-lane fractional-cycle biases are in part responsible for the deteriorated relative accuracy of SD IAR achieved orbits. Therefore, we suggest that the integrated SD IAR and DD IAR scheme should be implemented for the best orbit solutions of formation-flying missions.

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Acknowledgements

The work was sponsored by the National ‘863 Program’ of China (Grant No. 2014AA121501), the National Natural Science Foundation of China (Grant Nos. 41674033, 41574030, 41904009). The numerical calculations in this research have been done on the supercomputing system in the Supercomputing Center of Wuhan University. The FCB or phase bias products can be found at ftp://igs.gnsswhu.cn/pub/whu/phasebias/, and open-source PPP-AR software can be obtained from pride.whu.edu.cn.

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  1. GNSS Research Center, Wuhan University, Wuhan, China

    Xiang Guo, Jianghui Geng, Xingyu Chen & Qile Zhao

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  1. Xiang Guo
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Correspondence to Jianghui Geng.

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Guo, X., Geng, J., Chen, X. et al. Enhanced orbit determination for formation-flying satellites through integrated single- and double-difference GPS ambiguity resolution. GPS Solut 24, 14 (2020). https://doi.org/10.1007/s10291-019-0932-1

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