Abstract
This paper presents an improved alpha shape-based linear interpolation method, and an improved binning method within the continuum method framework for accurate and efficient planar phase space long-term density propagation. The density evolution equation is formulated for the continuum density propagation under the influence of the solar radiation pressure and Earth’s oblateness using semi-analytical equations. The concept of the alpha shape is included to get accurate interpolated density within the non-convex hull enclosing all the samples for the highly deformed and elongated density distribution. The improved binning method increases the density accuracy by considering the variant nonlinearity of the density within each alpha shape triangulation, which calculates the joint and marginal density as the weighted sum of density weights per bin area and per bin width, respectively. The suitable sample number for the continuum method and the suitable grid number for performing the linear interpolation are selected by trading off the density accuracy and the computational effort. The superiority of the improved alpha shape-based continuum method is demonstrated for accurate and efficient density propagation in the context of the high-altitude and high area-to-mass ratio satellite long-term propagation.
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Acknowledgments
The work has received funding from China Scholarship Council (CSC No. 202006830123), 2020 Postgraduate Research Practice Innovation Program of Jiangsu Province (Grant No. KYCX20_0222). Pan Sun and Shuang Li fully appreciate their financial supports.
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Appendices
Appendix A: Scenario 2, t = 1.5 yrs
For the case Scenario 2, t = 1.5 yrs, for the AT method, the compact alpha shape triangulation enclosing all the samples is generated for a predefined alpha radius ra = 8. Figure
8 presents the illustration and comparison for the DT and AT methods for the case Nsam = 961 for Scenario 2, t = 1.5 yrs in the solar angle-eccentricity 2D phase space. The values of the sample number and the grid number are selected as Nsam = 2000, Ngrid = 1000 for the AT-B2 method, by trading off the density accuracy and the computational efficiency. Figure
9 presents the evolution of the normalized LD measure for the joint and marginal density with Nsam, and with Ngrid, respectively, for AT-B2, AT-B1 and DT-B1 methods, with respect to the case AT-B2 (Nsam = 2000, Ngrid = 1000). Figure
10 gives the evolution of the normalized performance index with Nsam, and with Ngrid, respectively, with respect to the case AT-B2 (Nsam = 2000, Ngrid = 1000). Figure
11 presents the evolution of the normalized computational effort with Nsam, and with Ngrid, respectively, with respect to that of the MC method. For the selected sample number and the grid number {Nsam = 2000, Ngrid = 1000} for the case Scenario 2, t = 1.5 yrs, we present the joint and marginal density in Figs.
12 and
13, for the AT-B2 method compared with the AT-B1, DT-B1 methods with respect to that of the MC method.
Appendix B: Scenario 2, t = 3 yrs
For the case Scenario 2, t = 3 yrs, for the AT method, the compact alpha shape triangulation enclosing all the samples is generated for a predefined alpha radius ra = 0.03. Figure
14 presents the illustration and comparison for the DT and AT methods for the case Nsam = 961 for Scenario 2, t = 3 yrs in the solar angle-eccentricity 2D phase space. The values of the sample number and the grid number are selected as Nsam = 2000, Ngrid = 1000 for the AT-B2 method, by trading off the density accuracy and the computational efficiency. Figure
15 presents the evolution of the normalized LD measure for the joint and marginal density with Nsam, and with Ngrid, respectively, for AT-B2, AT-B1 and DT-B1 methods, with respect to the case AT-B2 (Nsam = 2000, Ngrid = 1000). Figure
16 gives the evolution of the normalized performance index with Nsam, and with Ngrid, respectively, with respect to the case AT-B2 (Nsam = 2000, Ngrid = 1000). Figure
17 presents the evolution of the normalized computational effort with Nsam, and with Ngrid, respectively, with respect to that of the MC method. For the selected sample number and the grid number {Nsam = 2000, Ngrid = 1000} for the case Scenario 2, t = 3 yrs, we present the joint and marginal density in Figs.
18 and
19, for the AT-B2 method compared with the AT-B1, DT-B1 methods with respect to that of the MC method.
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Sun, P., Li, S., Trisolini, M. et al. Improved alpha shape-based continuum method for long-term density propagation. Celest Mech Dyn Astron 136, 5 (2024). https://doi.org/10.1007/s10569-023-10171-2
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DOI: https://doi.org/10.1007/s10569-023-10171-2