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Two-layer Lagrange-based relay network topology and trajectory design for solar system explorations

Science China(Information Sciences) 2024年第6期67卷 342-358页

作者： Jun CAO Jian JIAO Hao LIU Rongxing LU Qinyu ZHANG Guangdong Provincial Key Laboratory of Aerospace Communication and Networking Technology Harbin Institute of Technology (Shenzhen) Faculty of Computer Science (FCS) University of New Brunswick

Exploration targeting outer planets and even the edge of the solar system is an emerging direction for the deep-space exploration in the next decades. To address this challenge, a novel two-layer Lagrangebased relay network topology is proposed in this study. Specifically, we utilize the Sun-Mars and Sun-Saturn Lagrange points(LPs) L4 and L5 to build a two-layer backbone relay network, which ensures continuous and high-efficiency communication capability for the exploration of the solar system. Furthermore, we utilize the planetary gravity assist and design the transfer trajectory of backbone relays with the help of planetary celestial body motion equations and Kepler's laws. Moreover, we conduct link budget analysis for multihop relay transmission under Gamma-Gamma distribution, shadowed Rician fading, and additive white Gaussian noise channels in several typical exploration scenarios and validate that the LP relays can effectively support future deep-space exploration missions.

关键词： deep-space communication lagrangian points backbone relay network transfer trajectory relay selection

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Natural coupled orbit-attitude periodic motions in the perturbed-CRTBP including radiated primary and oblate secondary

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Astrodynamics 2023年第2期7卷 229-249页

作者： Majid Bakhtiari Ehsan Abbasali Siavash Sabzy Amirreza Kosari School of Advanced Technologies Iran University of Science and TechnologyNarmakTehran 16844Iran Aerospace Group Faculty of New Sciences and TechnologiesUniversity of TehranNorth Kargar StreetTehranIran

This study investigated periodic coupled orbit-attitude motions within the perturbed circular restricted three-body problem(P-CRTBP)concerning the perturbations of a radiated massive primary and an oblate *** radiated massive primary was the Sun,and each planet in the solar system could be considered an oblate *** the problem has no closed-form solution,numerical methods were ***,the general response of the problem could be non-periodic or periodic,which is significantly depended on the initial conditions of the orbit-attitude ***,the simultaneous orbit and attitude initial states correction(SOAISC)algorithm was introduced to achieve precise initial *** the other side,the conventional initial guess vector was essential as the input of the correction algorithm and increased the probability of reaching more precise initial ***,a new practical approach was developed in the form of an orbital correction algorithm to obtain the initial conditions for the periodic orbit of the *** new proposed algorithm may be distinguished from previously presented orbital correction algorithms by its ability to propagate the P-CRTBP family orbits around the lagrangian points using only one of the periodic orbits of the unperturbed CRTBP(U-CRTBP).In addition,the Poincarémap and Floquet theory search methods were used to recognize the various initial guesses for attitude *** of these search methods was able to identify different initial guesses for attitude ***,as a new innovation,these search methods were applied as a powerful tool to select the appropriate inertia ratio for a satellite to deliver periodic responses from the coupled *** the mentioned perturbations to the U-CRTBP could lead to the more accurate modeling of the examination environment and a better understanding of a spacecraft's natural motion.A comparison between the orbit-attitude natural motions in the

关键词： oblate and radiated primary perturbed periodic orbit-attitudebehavior periodic orbit three-body problem lagrangian points

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Oblateness Effect of Saturn on Halo Orbits of L1 and L2 in Saturn-Satellites Restricted Three-Body Problem

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International Journal of Astronomy and Astrophysics 2016年第4期6卷 347-377页

作者： Nishanth Pushparaj Ram Krishan Sharma Department of Aerospace Engineering Karunya University Coimbatore India

The Circular Restricted Three-Body Problem (CRTBP) with more massive primary as an oblate spheroid with its equatorial plane coincident with the plane of motion of the primaries is considered to generate the halo orbits around L1 and L2 for the seven satellites (Mimas, Enceladus, Tethys, Dione, Rhea, Titan and Iapetus) of Saturn in the frame work of CRTBP. It is found that the oblateness effect of Saturn on the halo orbits of the satellites closer to Saturn has significant effect compared to the satellites away from it. The halo orbits L1 and L2 are found to move towards Saturn with oblateness.

关键词： Circular Restricted Three-Body Problem lagrangian points Halo Orbits Oblateness Saturn

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