Fixed-Time Impact Time Control Guidance Law for Missiles With Input Saturation Constraints Against Maneuvering Targets

This paper is concerned with the fixed-time impact time control guidance (ITCG) problem against maneuvering targets. Firstly, the fixed-time observers are adopted to estimate the maneuvering target’s unknown acceleration. Then, a fixed-time ITCG law is derived by resorting to the time-to-go of deviated pursuit guidance, where the unknown target acceleration is compensated based on the estimates obtained from the fixed-time observers. Moreover, an auxiliary system is adopted to tackle the frequently encountered input saturation constraints, and the fixed-time stability of the proposed ITCG law is analyzed. Finally, simulation results are provided to demonstrate the designed ITCG law.