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Journal of Projectiles, Rockets, Missiles and Guidance >

2026 , Vol. 46 >Issue 1: 88 - 96

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2026.01.009

3D Fixed-time Sliding Mode Impact Angle Control Guidance Law Based on Fuzzy Logic System

  • WANG Shaolong 1 ,
  • ZHU Tianshe 1 ,
  • LIU Jiaqi 2 ,
  • LIN Shiyao , 2, *
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  • 1 Northwest Industrial Group Company. Ltd., Xi'an 710043, Shaanxi, China
  • 2 China Research and Development Academy of Machinery Equipment,Beijing 100089, China

Received date: 2025-12-20

  Online published: 2026-03-09

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Abstract

This paper investigates the guidance of missiles striking the maneuvering targets in three-dimensional (3D) space in the presence of model uncertainties, unknown target maneuvers and terminal impact angle constraints. An impact angle control guidance law based on nonsingular fixed-time sliding mode control (NFTSMC) and fuzzy logic is proposed. First, a 3D missile-target relative motion model is established, and the terminal impact angle constraint control is reformulated as a line-of-sight (LOS) angle tracking problem. To overcome the singularity commonly encountered in conventional terminal sliding mode control, a nonsingular fixed-time sliding mode surface (NFTSMS) is constructed, and an auxiliary function is introduced to guarantee singularity-free controller design. In addition, a fuzzy logic system (FLS) is incorporated to online approximate the lumped disturbances induced by target maneuvers and model uncertainties. The fixed-time stability of all signals from the closed-loop system is strictly proved based on Lyapunov stability theory. The simulated results show that the proposed guidance law can achieve the accurate interception of maneuvering targets under different initial conditions. Compared with the existing fixed-time sliding mode guidance strategy, it has significant advantages in suppressing the control command chattering and improving the line-of-sight angle tracking accuracy.

Key words： three-dimensional guidance law; fixed-time stabilization; nonsingular terminal sliding mode surface; terminal impact angle constraint; fuzzy logic system

Cite this article

WANG Shaolong , ZHU Tianshe , LIU Jiaqi , LIN Shiyao . 3D Fixed-time Sliding Mode Impact Angle Control Guidance Law Based on Fuzzy Logic System[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2026 , 46(1) : 88 -96 . DOI: 10.15892/j.cnki.djzdxb.2026.01.009

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