Analytical Study of CLOS Guidance Law against Head-on High-Speed Maneuvering Targets

Abstract

A command to line-of-sight (CLOS) guidance law is developed against head-on high-speed maneuvering targets. Preliminary studies have shown that the aspect angle of the interceptor at lock-on near 180 deg is a fundamental requirement for achieving small miss distance against a very high-speed incoming target. The solutions of missile trajectory obtained before under this guidance scheme seemed tedious and incomplete. Now, in this study, exact and complete solutions which are more general and comprehensive than those obtained before are derived for head-on high-speed maneuvering targets. Some related important characteristics such as lateral acceleration demand and normalized missile acceleration are investigated and discussed. Additionally, illustrated examples of target maneuvering are introduced to easily describe the trajectory of the target. The results obtained in this study are very significant and practical, and will be useful in actual application.

Novel command to line of sight guidance with practical limitations

“…Considering (7) and taking the advantages of estimated variables, the following feed-forward control law is suggested…”

“…A supervisory controller for CLOS guidance with lead angle is employed in Nobahari et al [6] which guarantees the pursuer to fly within a beam angle constraint. In Chao et al [7], an analytical study of planar CLOS law against head‐on high‐speed maneuvering targets is presented. Robust CLOS law with the aid of fuzzy modifier rules is addressed in Sadeghinasab et al [8] to obtain faster time responses.…”

Observer-Based Optimal Zero-Sliding Midcourse Guidance for Missiles with TVC and DCS

“…A CLOS guidance law is developed for head-on high-speed maneuvering targets using lateral acceleration demand and normalized missile acceleration. 9) To generate a linear parametric state-space model, an optimal linear-fractional-transformation-based robust stability analysis and control design is presented by Pfifer and Hecker. 10) Basin et al 11) derive the optimal regulator for a linear system with time delay in control input using the duality principle and then the optimal regulator is proved using the maximum principle.…”

Integrated CLOS and PN Guidance for Increased Effectiveness of Surface to Air Missiles

“…For the terminal phase, CLOS guidance law without lead angle was employed and a sliding mode controller was proposed, and the parameters of the proposed controllers were optimized by Ant Colony Optimization. Chao, Lee and Soong presented an analytical study of the aspect angle of the interceptor at lock-on, lateral acceleration and normalized missile acceleration of command to line-of-sight guidance against head-on high speed maneuvering targets in their paper [11].…”