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Design of ReFEx Guidance: Trajectory Correction after Ascent

Redondo Gutierrez, Jose Luis and Seelbinder, David and Theil, Stephan (2023) Design of ReFEx Guidance: Trajectory Correction after Ascent. In: AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2023. American Institute of Aeronautics and Astronautics, Inc.. AIAA SCITECH 2023 Forum, 23-27 Jan 2023, National Harbor, MD, USA. doi: 10.2514/6.2023-1995.

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Official URL: https://arc.aiaa.org/doi/10.2514/6.2023-1995


This paper presents the design and implementation of a guidance algorithm for the re-entry vehicle ReFEx. This algorithm aims at correcting for the dispersion in position and velocity after separation from the launcher, by generating an updated trajectory leading from the estimated state to the target. The need for this trajectory update is driven by the huge uncertainty regarding the state at the end of the ascent phase, as ReFEx will be launched with an unguided rocket. The transcription of the problem into an optimal control problem is used as a baseline to verify the algorithm proposed. This algorithm consists of a simplification of the optimal control problem, reducing the profiles of the control variables to a set of control parameters. Defining this set of parameters is not trivial as it limits the solution space. Combining this problem reduction with a function that propagates the trajectory from the initial state, this approach is able to transform the problem into an unconstrained optimization problem. This paper shows that this simplification is able to find solutions of similar quality as the full optimal control approach. The results also show that the uncertainty of the state at separation is excessively high to guarantee reaching the nominal target. Therefore, a strategy to define the convergence envelope to the nominal target is developed. This approach, which is also used to define the alternative target, is based in regularized logistic regression.

Item URL in elib:https://elib.dlr.de/193882/
Document Type:Conference or Workshop Item (Speech)
Title:Design of ReFEx Guidance: Trajectory Correction after Ascent
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Redondo Gutierrez, Jose LuisUNSPECIFIEDhttps://orcid.org/0000-0002-0037-2299UNSPECIFIED
Seelbinder, DavidUNSPECIFIEDhttps://orcid.org/0000-0003-4080-3169UNSPECIFIED
Theil, StephanUNSPECIFIEDhttps://orcid.org/0000-0002-5346-8091137529314
Journal or Publication Title:AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2023
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Publisher:American Institute of Aeronautics and Astronautics, Inc.
Keywords:Guidance, Reentry, ReFEx, Optimization
Event Title:AIAA SCITECH 2023 Forum
Event Location:National Harbor, MD, USA
Event Type:international Conference
Event Dates:23-27 Jan 2023
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Project ReFEx - Reusability Flight Experiment
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Navigation and Control Systems
Deposited By: Redondo Gutierrez, Jose Luis
Deposited On:26 Jun 2023 09:11
Last Modified:26 Jun 2023 09:11

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