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Safe landing area determination for a Moon lander by reachability analysis

Arslantas, Yunus and Oehlschlägel, Thimo and Sagliano, Marco (2016) Safe landing area determination for a Moon lander by reachability analysis. Acta Astronautica, 128, pp. 607-615. Elsevier. doi: 10.1016/j.actaastro.2016.08.013. ISSN 0094-5765.

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In the last decades developments in space technology paved the way to more challenging missions like asteroid mining, space tourism and human expansion into the Solar System. These missions result in difficult tasks such as guidance schemes for re-entry, landing on celestial bodies and implementation of large angle maneuvers for spacecraft. There is a need for a safety system to increase the robustness and success of these missions. Reachability analysis meets this requirement by obtaining the set of all achievable states for a dynamical system starting from an initial condition with given admissible control inputs of the system. This paper proposes an algorithm for the approximation of nonconvex reachable sets (RS) by using optimal control. Therefore subset of the state space is discretized by equidistant points and for each grid point a distance function is defined. This distance function acts as an objective function for a related optimal control problem (OCP). Each infinite dimensional OCP is transcribed into a finite dimensional Nonlinear Programming Problem (NLP) by using Pseudospectral Methods (PSM). Finally, the NLPs are solved using available tools resulting in approximated reachable sets with information about the states of the dynamical system at these grid points. The algorithm is applied on a generic Moon landing mission. The proposed method computes approximated reachable sets and the attainable safe landing region with information about propellant consumption and time.

Item URL in elib:https://elib.dlr.de/106519/
Document Type:Article
Title:Safe landing area determination for a Moon lander by reachability analysis
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Arslantas, YunusUNSPECIFIEDhttps://orcid.org/0000-0001-9924-2250UNSPECIFIED
Date:November 2016
Journal or Publication Title:Acta Astronautica
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 607-615
Keywords:reachability, optimal control, trajectory optimization, moon lander
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Projekt ATON (old)
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Navigation and Control Systems
Deposited By: Arslantas, Yunus Emre
Deposited On:10 Oct 2016 16:59
Last Modified:08 Nov 2023 15:18

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