Design of Three-dimensional Incremental Disturbance Compensation Guidance Law Considering Terminal Angle Constraints

Aiming at the interception issue of maneuvering targets with specific terminal collision angle requirements, a disturbance compensation incremental terminal angle-constrained three-dimensional guidance law design approach is proposed. Firstly,based on the nonlinear three-dimensional coupled relative kinematics model and line-of-sight(LOS) rotation dynamics,and in combination with the inertial delay estimation method,a three-dimensional terminal angle-constrained guidance law for online compensation of disturbances such as target maneuvering overload and external perturbation is designed. Secondly,to further enhance the anti-jamming characteristics of the guidance law,an incremental dynamic inverse method based on the Taylor expansion of the LOS angle error dynamics is utilized to compress the error dynamic system disturbance and guidance command into an incremental form within a sampling step. Subsequently,a novel three-dimensional incremental disturbance compensation angle-constrained guidance law is proposed under the infusion of the latest measurement information. Theoretical analysis indicates that the angle constraint and perturbation estimation deviation can converge to a small bounded neighborhood. Multiple scenarios compared with various methods under numerical simulation and Monte Carlo test under complex conditions reveal that the designed method possesses strong adaptability and robustness. © 2024 Chinese Society of Astronautics. All rights reserved.