English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

A strategy for the analysis of active debris removal missions targetingmultiple objects from a set of objects in near-circular orbit with similarinclination is presented. Algebraic techniques successfully reduce the orbitalmechanics regarding specific inter-debris transfer and disposal methods tosimple computations, which can be used as the coefficients of a quadraticunconstrained binary optimisation (QUBO) problem formulation which minimisesthe total propellant used in the mission whilst allowing for servicing time andmeeting the mission deadline. The QUBO is validated by solving artificial smallproblems (from 2 to 11 debris) using classical computational methods and theweaknesses in using these methods are examined prior to solution using quantumannealing hardware. The quantum processing unit (QPU) and quantum-classicalhybrid solvers provided by D-Wave are then used to solve the same smallproblems, with attention paid to evident strengths and weaknesses of eachapproach. Hybrid solvers are found to be significantly more effective atsolving larger problems. Finally, the hybrid method is used to solve a largeproblem using a real dataset. From a set of 79 debris objects resulting fromthe destruction of the Kosmos-1408 satellite, an active debris removal missionstarting on 30 September 2023 targeting 5 debris objects for disposal within ayear with 20 days servicing time per object is successfully planned. This plancalculates the total propellant cost of transfer and disposal to be 0.87km/sand would be complete well within the deadline at 241 days from the start date.This problem uses 6,478 binary variables in total and is solved using around25s of QPU access time.

Optimisation of Active Space Debris Removal Missions With Multiple Targets Using Quantum Annealing