Abstract
Relative motion improvements have traditionally focused on inserting additional force models into existing formulations to achieve greater fidelity, or complex expansions to admit eccentric orbits for propagation. A simpler approach may be numerically integrating the two satellite positions and then converting to a modified equidistant cylindrical frame for comparison in a Hill’s-like frame. Recent works have introduced some approaches for this transformation within the Hill’s construct, and examined the accuracy of the transformation. Still others have introduced transformations as they apply to covariance operations. Each of these has some orbital or force model limitations and defines an approximate circular reference dimension. We develop a precise transformation between the Cartesian and curvilinear frame along the actual satellite orbit and test the results for various orbital classes. The transformation has wide applicability.
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Notes
We use the term “sigma points” to indicate the depiction of an ellipsoid by its 6 principal points. These points fully describe the ellipsoid and they lie along the eigen-axes of the ellipsoid. There are two methods we use. One finds the 6 points to describe the ellipsoid (eigenvalue decomposition), and one to find the ellipsoid given just the 6 points (minimum volume enclosing ellipsoid algorithm).
Surface points are used in the inverse transformation because using the sigma points would yield the same ellipsoid as in Fig. 8. The number of surface points taken depends on the desired grid and fineness of the resulting ellipsoid.
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Vallado, D.A., Alfano, S. Curvilinear coordinate transformations for relative motion. Celest Mech Dyn Astr 118, 253–271 (2014). https://doi.org/10.1007/s10569-014-9531-1
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DOI: https://doi.org/10.1007/s10569-014-9531-1