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A Practical Optimal Guidance Scheme Under Impact Angle and Terminal Acceleration Constraints

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A Publisher Correction to this article was published on 18 October 2021

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Abstract

This paper proposes a practical optimal guidance law that can handle terminal angle and acceleration constraints while providing robustness against uncertainty in autopilot dynamics. Building upon a well-established linear-quadratic optimal guidance framework, we first derive an energy-minimizing guidance scheme that nullifies terminal acceleration called optimal guidance law with impact angle and terminal acceleration constraints (OGL–IATA). Then, a practical modification to OGL–IATA is proposed to deal with the stability degradation of OGL–IATA due to unmodeled high-order autopilot dynamics. The modification primarily features feedback of pseudo-acceleration that is computed by passing the true acceleration signal through approximate missile dynamics; this simple modification is demonstrated to improve the stability margin of the guidance loop. Numerical examples of nonlinear engagement kinematics demonstrate the performance and the robustness characteristics of the proposed practical guidance scheme.

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Authors and Affiliations

  1. Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Korea

    Hyo-Seon Chi, Chang-Hun Lee & Han-Lim Choi

  2. Agency for Defense Development (ADD), Yuseong, P. O. Box 35, Daejeon, 34186, Korea

    Yong-In Lee

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  1. Hyo-Seon Chi
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  2. Yong-In Lee
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  3. Chang-Hun Lee
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  4. Han-Lim Choi
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Correspondence to Han-Lim Choi.

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The original online version of this article was revised: Due to an unfortunate mistake during the correction process, figure 7 overlaps the text.

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Chi, HS., Lee, YI., Lee, CH. et al. A Practical Optimal Guidance Scheme Under Impact Angle and Terminal Acceleration Constraints. Int. J. Aeronaut. Space Sci. 22, 923–935 (2021). https://doi.org/10.1007/s42405-020-00339-7

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  • DOI: https://doi.org/10.1007/s42405-020-00339-7

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