Terminal guidance algorithms of missiles maneuvering in the vertical plane

Advanced Top-Attack Trajectory Guidance Law with Impact Angle Constraints

“…For each engagement scenario, a minimum miss distance is required to be achieved as well as a suitable terminal impact angle to ensure more damage effect [5] . For all of these reasons, the impact angle constrained guidance problems have occupied the attention of many researchers in the field of the guided weapons and missiles [6] . Through this paper a 3rd-degree polynomial based guidance law with impact angle constrained is introduced for shaping a predesigned top-attack trajectory for ATGM, which is characterized by passive guidance, limiting the possibility of disturbances in its flight, and the ability to lock on a target before launch what is known as "LOBL" in "Fireand-Forget" mode or lock on a target after launch in what is known as "LOAL" [2] .…”

Analytic solutions of optimal angularly constrained guidance for first-order lag system

“…Ben-Asher and Yaesh 3 presented optimal guidance laws with weights on terminal velocity that can be translated as weights on the impact angle. Kim et al 4 suggested an optimal angular constrained guidance to minimize a combined cost of overall control efforts and flight heights in the vertical plane, which provides low altitude trajectory to reduce the risks of being detected and counter-attacked. Kim et al 5 have considered a time-varying bias which is intuitively chosen as a combination of the state variables such as line-of-sight (LOS) angle, the relative range, and the flight path angle.…”