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CEAS EuroGNC 2022

Terminal Phase Nonlinear Attitude Autopilot Design For Dual-Spin Guided Projectiles
Sofiane Pineau PhD student, University of Lorraine, CRAN-UMR-CNRS-7039, France. & French-German Research Institute of Saint-Louis, Department of Guidance, Navigation and Control, 68300, Saint-Louis, France.
Spilios Theodoulis Flight Dynamics and Control Research Scientist, French-German Research Institute of Saint-Louis, Department of Guidance, Navigation and Control, 68300, Saint-Louis, France.
Michel Zasadzinski Professor, University of Lorraine, CRAN-UMR-CNRS-7039, France.
Mohamed Boutayeb Professor, University of Lorraine, CRAN-UMR-CNRS-7039, France.
Abstract:
This article proposes a straightforward methodology applied to the design of a nonlinear attitude autopilot for a 155 mm spin-stabilized projectile equipped with a roll-decoupled course-correction fuze. The primary purpose of the autopilot is to control the projectile pitch and yaw angles during the terminal phase of its trajectory in order to handle impact angles arrival. The nonlinear attitude flight dynamics model is first summarized along with all necessary subsystem models such as aerodynamic moments, control allocation and actuators. The Incremental Nonlinear Dynamic Inversion (INDI) was used to successfully linearize the roll and lateral dynamics. Linear robust H∞ controllers were subsequently designed in an inner/outer loop configuration to ensure proper reference angle tracking of the projectile dynamics. Practical implementation constraints such as finite computational sampling time and potential on-board delays were integrated into the design process via a standard Modified Continuous Design technique and the impact of low sampling frequency on INDI decoupling capacity was investigated. Full trajectory nonlinear simulation results show a successful implementation of the INDI control laws in terms of tracking performance and axis decoupling.
Keywords: dual-spin projectiles; Incremental Nonlinear Dynamic Inversion; autopilot design; flight dynamics
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Sofiane Pineau, Spilios Theodoulis, Michel Zasadzinski, Mohamed Boutayeb: Terminal Phase Nonlinear Attitude Autopilot Design For Dual-Spin Guided Projectiles. Proceedings of the 2022 CEAS EuroGNC conference. Berlin, Germany. May 2022. CEAS-GNC-2022-073.
BibTeX entry:

@Incollection{CEAS-GNC-2022-073,
    authors = {Pineau, Sofiane and Theodoulis, Spilios and Zasadzinski, Michel and Boutayeb, Mohamed},
    title = {Terminal Phase Nonlinear Attitude Autopilot Design For Dual-Spin Guided Projectiles},
    booktitle = {Proceedings of the 2022 {CEAS EuroGNC} conference},
    address = {Berlin, Germany},
    month = may,
    year = {2022},
    note = {CEAS-GNC-2022-073}
}