Deorbiting Timing for Spacecraft in Geostationary Transfer Orbits Exploiting Luni–Solar Perturbations

2018 ◽  
Vol 55 (1) ◽  
pp. 251-256
Author(s):  
Yue Wang ◽  
Pini Gurfil
Keyword(s):  
Transfer Orbits ◽  
Solar Perturbations

scholarly journals Dynamical lifetime survey of geostationary transfer orbits

2018 ◽  
Vol 130 (11) ◽  
Author(s):  
Despoina K. Skoulidou ◽  
Aaron J. Rosengren ◽  
Kleomenis Tsiganis ◽  
George Voyatzis
Keyword(s):  
Transfer Orbits

scholarly journals Sequential Low-Thrust Orbit-Raising of All-Electric Satellites

Aerospace ◽  
2020 ◽  
Vol 7 (6) ◽  
pp. 74
Author(s):  
Pardhasai Chadalavada ◽  
Tanzimul Farabi ◽  
Atri Dutta
Keyword(s):  
Neural Network ◽  
Numerical Simulations ◽  
Power Loss ◽  
Average Power ◽  
Radiation Belts ◽  
Solar Array ◽  
Low Thrust ◽  
Computational Framework ◽  
Transfer Orbits ◽  
The Neural Network

In this paper, we consider a recently developed formulation of the electric orbit-raising problem that utilizes a novel dynamic model and a sequence of optimal control sub-problems to yield fast and robust computations of low-thrust trajectories. This paper proposes two enhancements of the computational framework. First, we use thruster efficiency in order to determine the trajectory segments over which the spacecraft coasts. Second, we propose the use of a neural network to compute the solar array degradation in the Van Allen radiation belts. The neural network is trained on AP-9 data and SPENVIS in order to compute the associated power loss. The proposed methodology is demonstrated by considering transfers from different geosynchronous transfer orbits. Numerical simulations analyzing the effect of thruster efficiency and average power degradation indicate the suitability of starting the maneuver from super-geosynchronous transfer orbits in order to limit fuel expenditure and radiation damage. Furthermore, numerical simulations demonstrate that proposed enhancements are achieved with only marginal increase in computational runtime, thereby still facilitating rapid exploration of all-electric mission scenarios.

scholarly journals Present problems in relativistic Celestial Mechanics

1986 ◽  
Vol 114 ◽  
pp. 5-17
Author(s):  
V. A. Brumberg
Keyword(s):  
Time Scales ◽  
Celestial Mechanics ◽  
Reference Frames ◽  
Artificial Satellite ◽  
Circular Motion ◽  
Newtonian Approximation ◽  
Satellite Problem ◽  
Solar Perturbations ◽  
Coordinate Functions ◽  
Schwarzschild Problem

Review of the present problems of relativistic celestial mechanics. Advantage is taken of the method suggested earlier by the author and based on using quasi-Galilean coordinates with arbitrary coordinate functions or parameters. As compared with the previous papers the new elements are post-post-Newtonian approximation for the circular motion in the Schwarzschild problem and reduction of the artificial satellite problem including the main solar perturbations to the Schwarzschild problem. Some current questions of time scales definitions, reference frames and reduction of observations are briefly discussed.

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