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Real-Time Atmospheric Entry Trajectory Computation Using Parametric Sensitivities

Seelbinder, David und Büskens, Christof (2016) Real-Time Atmospheric Entry Trajectory Computation Using Parametric Sensitivities. In: Proceeding of the 6th International Conference on Astrodynamics Tools and Techniques. International Conference on Astrodynamics Tools and Techniques, 2016-03-14 - 2016-03-17, Darmstadt, Deutschland.

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Offizielle URL: https://indico.esa.int/indico/event/111/

Kurzfassung

The real-time generation of optimal trajectories and controls for nonlinear systems is a technology of interest to many applications. The online solution of an optimal control Problem (OCP) is often not computationally feasible on current embedded systems hardware. We present a method to generate a near-optimal control sequence and the corresponding state trajectory based on the parametric sensitivity Analysis (PSA) of nonlinear programs (NLPs) which does not require performing the classical gradient based NLP process online and hence reduces the computational load. The OCP is transcribed into a parametric NLP which is solved offline for a nominal set of parameters. Additionally the parametric sensitivities of the optimal solution with respect to different types of perturbations are computed at discrete points along the nominal trajectory. The sensitivities are used online in a Taylor expansion of the nominal solution and an iterative feasibility and optimality restoration to compute a new near-optimal control sequence and trajectory from an off-nominal state to the terminal set without solving a NLP. This process is repeated iteratively in the neighborhood of the nominal trajectory. The proposed method is demonstrated for the guided, hypersonic entry of a small capsule into the Martian atmosphere. The PSA algorithm is used as feed forward command and trajectory generation to provide the input for a dragenergy tracking controller.

elib-URL des Eintrags:https://elib.dlr.de/103875/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Real-Time Atmospheric Entry Trajectory Computation Using Parametric Sensitivities
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Seelbinder, Daviddavid.seelbinder (at) dlr.dehttps://orcid.org/0000-0003-4080-3169NICHT SPEZIFIZIERT
Büskens, Christofbueskens (at) math.uni-bremen.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:März 2016
Erschienen in:Proceeding of the 6th International Conference on Astrodynamics Tools and Techniques
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Optimal Control, Parametric Sensitivity, Re-entry, Guidance
Veranstaltungstitel:International Conference on Astrodynamics Tools and Techniques
Veranstaltungsort:Darmstadt, Deutschland
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:14 März 2016
Veranstaltungsende:17 März 2016
Veranstalter :European Space Agency
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Raumtransport
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R RP - Raumtransport
DLR - Teilgebiet (Projekt, Vorhaben):R - Shefex III (alt)
Standort: Bremen
Institute & Einrichtungen:Institut für Raumfahrtsysteme > Navigations- und Regelungssysteme
Hinterlegt von: Seelbinder, David
Hinterlegt am:12 Apr 2016 12:41
Letzte Änderung:24 Apr 2024 20:09

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