Journal of Astronautics ›› 2022, Vol. 43 ›› Issue (4): 508-517.doi: 10.3873/j.issn.1000-1328.2022.04.012

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Incremental Three Dimensional Guidance Law Design under Seeker’s Measuring Faults

FANG Yi zhong, HAN Tuo, HU Qing lei   

  1. 1. National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics,Beijing Institute of Space Long March Vehicle, Beijing 100076, China;2. School of Automation Science and Electrical Engineering,Beihang University, Beijing 100191, China
  • Received:2021-08-24 Revised:2021-11-22 Online:2022-04-15 Published:2022-04-15

Abstract: This paper considers the homing guidance against maneuvering targets considering seeker’s measuring faults. To simultaneously enhance guidance robustness, reduce guidance gains and system residual, and avoid severe oscillation/divergence of the line of sight (LOS) rate, a robustness enhanced three dimensional homing guidance law is designed via the incremental control method. First, the homing guidance problem is transformed to the control of zeroing LOS rate. Then, a traditional sliding mode guidance law design process is provided as a benchmark via defining an auxiliary variable including the relative range and the LOS rate. By using the incremental nonlinear dynamic inversion based sliding mode control method, the latest guidance command and estimated LOS angular acceleration are fully exploited to develop the incremental three dimensional robust guidance law. Finally, the system residual by two guidance laws under target maneuvers and seeker’s measuring faults are analyzed and compared. Theoretical analysis and simulations in various cases show that the incremental guidance law not only has strong robustness against target maneuvers and seeker’s measuring faults with large scale failures, but also requires smaller guidance gains and avoids the severe divergence of terminal LOS rate.

Key words: Three dimensional guidance law, Maneuvering targets, Incremental nonlinear dynamic inversion, Robustness, Measuring faults

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