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Improved alpha shape-based continuum method for long-term density propagation

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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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SP wrote the main manuscript, and all authors reviewed the manuscript.

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Correspondence to Pan Sun or Shuang Li.

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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

Fig. 8
figure 8

Illustration and comparison for the (a) DT and (b) AT methods for Scenario 2, t = 1.5 yrs (Nsam = 961)

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

Fig. 9
figure 9

Normalized LD evolution (a) with Nsam, and (b) with Ngrid, for DEE methods, with respect to the case AT-B2 (Nsam = 2000, Ngrid = 1000), for Scenairo 2, t = 1.5 yrs

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

Fig. 10
figure 10

Normalized performance index Jp evolution (a) with Nsam, and (b) with Ngrid, for DEE methods, with respect to the case AT-B2 (Nsam = 2000, Ngrid = 1000), for Scenario 2, t = 1.5 yrs

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

Fig. 11
figure 11

Normalized computational effort evolution (a) with Nsam, and (b) with Ngrid, for DEE methods, with respect to the MC method, for Scenario 2, t = 1.5 yrs

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.

Fig. 12
figure 12

The joint density (a) for the MC method; (b) for the DT-B1 method, (c) for the AT-B1 method, (d) for the AT-B2 method, with {Nsam = 2000, Ngrid = 1000} (for Scenario 2, t = 1.5 yrs)

12 and

Fig. 13
figure 13

The marginal density of the (a) solar angle, (b) and the eccentricity with {Nsam = 2000, Ngrid = 1000}, for DT-B1, AT-B1 and AT-B2 methods with respect to the MC method, for Scenario 2, t = 1.5 yrs

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

Fig. 14
figure 14

Illustration and comparison for the (a) DT and (b) AT methods for Scenario 2, t = 3 yrs (Nsam = 961)

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

Fig. 15
figure 15

Normalized LD evolution (a) with Nsam, and (b) with Ngrid, for DEE methods, with respect to the case AT-B2 (Nsam = 2000, Ngrid = 1000), for Scenairo 2, t = 3 yrs

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

Fig. 16
figure 16

Normalized performance index Jp evolution (a) with Nsam, and (b) with Ngrid, for DEE methods, with respect to the case AT-B2 (Nsam = 2000, Ngrid = 1000), for Scenario 2, t = 3 yrs

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

Fig. 17
figure 17

Normalized computational effort evolution (a) with Nsam, and (b) with Ngrid, for DEE methods, with respect to the MC method, for Scenario 2, t = 3 yrs

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.

Fig. 18
figure 18

The joint density (a) for the MC method; (b) for the DT-B1 method, (c) for the AT-B1 method, (d) for the AT-B2 method, with {Nsam = 2000, Ngrid = 1000} (for Scenario 2, t = 3 yrs)

18 and

Fig. 19
figure 19

The marginal density of the (a) solar angle, (b) and the eccentricity with {Nsam = 2000, Ngrid = 1000}, for DT-B1, AT-B1 and AT-B2 methods with respect to the MC method, for Scenario 2, t = 3 yrs

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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