Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields. 

Survey of Tether System Technology for Space Debris Removal Missions

In order to reduce the population of space debris in geosynchronous orbit, a tethered-Coulomb formation (TCF) is proposed that consists of a space tug and a cluster of charged debris connected by elastic massless tethers. The charged debris introduces repulsive coulomb forces to avoid collisions among the pieces of debris. In this way, the system is able to maintain a stable configuration when proper system parameters are given. To determine this relationship, a dynamics model of the formation was derived by using Lagrange’s equation. Then, precise and approximate equilibrium solutions of the debris item charges and tether lengths were derived analytically according to the different number of debris items in pyramid configurations of the TCF. Based on the analytical results, pyramid and double-pyramid TCF configurations were studied via numerical simulations. The results showed that oscillations of the debris had little impact on the motion of the tug. When designing a double-pyramid TCF system, two clusters of debris with large relative positions in different phases would show good performance in a deorbit mission. 

Dynamics of Tethered-Coulomb Formation for Debris Deorbiting in Geosynchronous Orbit

Towing space debris with the utilization of a tethered space tug, also referred to as debris-tether-tug (DTT) system, is considered to be one of the most promising methods to remove space debris. However, as the space tug only carries limited amounts of fuel, the number of debris that a DTT system can remove is limited. To increase the capacity of the DTT system, fuel consumption per towing cycle should be minimized. This study proposes an optimal deorbit scheme with two stages: optimal transfer and swing control. First, a dynamics model of the DTT system is formulated considering attitude–orbit coupling effects and tether flexibility. In the fuel optimal transfer stage, the dynamics model as well as two simplified models is employed to calculate the optimal transfer orbit, subject to a continuous thrust from the tug. By comparing the optimal results, it can be found that the attitude–orbit coupling effect of the DTT system is non-negligible, whereas the tether flexibility can be ignored with a large tether elasticity coefficient during the optimal orbit transfer mission. For the swing control stage at the destination, a control law is applied by regulating the velocity of tether releasement to increase the debris velocity. The parametric analysis of the control law suggests that the tether should be completely deployed before separation to achieve a larger orbit altitude increment. Appropriate parameters can be assigned to attain maximum orbit altitude increment in the swing control based on this analysis. The conclusions could serve as an effective reference for transfer orbit calculation and swing control design in future deorbit missions using the DTT system. 

Optimal debris removal using debris-tether-tug system considering attitude–orbit coupling effects

Out-of-plane chaotic motion and suppression for tethered tug-debris systems with thrust perturbation

Dynamics and control of an electrodynamic tug: Transfer to the graveyard orbit

Dynamics of a debris towing system with hierarchical tether architecture

The invention discloses a rope system dragging system and method used for cleaning away space debris, and belongs to the technical field of spaceflight The rope system dragging system used for cleaning away the space debris comprises a tugboat, a rope and a rope retraction mechanism, and the space debris is the to-be-dragged object which can be cleaned away; the end, connected to the tugboat, ofthe rope is a main rope, the other end of the rope is bifurcated into a plurality of sub ropes connected to the edge of the space debris, the tugboat is utilized to generate pushing force, so that thespace debris is dragged for deorbiting, and the cleaning task is completed; the sub ropes connected with the edge of the space debris are adopted to increase the redundancy of the system, and the reliability of the rope system dragging system is improved; the sub ropes connected with the space debris can generate force torque for correcting the posture deviation of the space debris to inhibit posture motions of the space debris, so that the unstability of the rope system dragging system is avoided The invention further discloses the rope system dragging method used for cleaning away the space debris The method is used for the rope system dragging system used for cleaning away the space debris to achieve the purpose of cleaning away the space debris

Rope system dragging system and method used for cleaning away space debris

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Dynamics of a debris towing system with hierarchical tether architecture

Rope system dragging system and method used for cleaning away space debris