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

This paper provides an academic insight into the design of a three-dimensional guidance law which can be utilized to reach the maneuvering targets in definite angles. Firstly, the theoretical phenomenon of a conventional dynamic inversion which can be implemented for reaching targets with constant velocity will be addressed. However, given that this method is not applicable for reaching accelerated targets, a combination of dynamic inversion method and sliding mode control is presented. These mechanisms can impact maneuvering targets with bounded acceleration. Proceeding 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, which is the predominant disadvantage of the sliding mode, will be analysed. Given these findings, a second terminal sliding surface will be presented. This approach will be able to generate continuous guidance law whilst effectively eliminating the chattering problem that was evident in the sliding mode mechanism. Finally, through the application of numerical simulations, the effectiveness of the proposed guidance laws against maneuvering targets will be demonstrated.

Keywords:

Dynamic Inversion , Sliding mode control , Finite-time guidance law , Impact angle constraint , Maneuvering targets