Three-Dimensional Robust Guidance Law for Reaching Maneuvering Targets Based on Finite-Time Sliding Mode Control

This paper provides academic insight into designing a three-dimensional guidance law that can be utilized to reach maneuvering targets at definite angles. Firstly, the theoretical phenomenon of a conventional dynamic inversion will be addressed, which can be implemented for reaching targets with constant velocity. However, given that this method does not apply to reaching accelerated targets, a combination of the dynamic inversion method and sliding mode control is presented. These mechanisms can impact maneuvering targets with bounded acceleration. Proceeding with the discussion of these observations, an improved form of the proposed controller will be introduced as this method guarantees a finite reaching time. Furthermore, the chattering phenomenon will be analyzed, which is the chief disadvantage of the sliding mode. Given these findings, a second terminal sliding surface will be presented. This approach will generate continuous guidance law while effectively eliminating the chattering problem in the sliding mode mechanism. Finally, the effectiveness of the proposed guidance laws against maneuvering targets will be demonstrated through the application of numerical simulations.