title: Sliding mode control based impact angle control guidance considering the seeker׳s field-of-view constraint.
abstract: The problem of impact angle control guidance for a field-of-view constrained missile against non-maneuvering or maneuvering targets is solved by using the sliding mode control theory. The existing impact angle control guidance laws with field-of-view constraint are only applicable against stationary targets and most of them suffer abrupt-jumping of guidance command due to the application of additional guidance mode switching logic. In this paper, the field-of-view constraint is handled without using any additional switching logic. In particular, a novel time-varying sliding surface is first designed to achieve zero miss distance and zero impact angle error without violating the field-of-view constraint during the sliding mode phase. Then a control integral barrier Lyapunov function is used to design the reaching law so that the sliding mode can be reached within finite time and the field-of-view constraint is not violated during the reaching phase as well. A nonlinear extended state observer is constructed to estimate the disturbance caused by unknown target maneuver, and the undesirable chattering is alleviated effectively by using the estimation as a compensation item in the guidance law. The performance of the proposed guidance law is illustrated with simulations.
authors.affiliation: Department of Control Engineering, Naval Aeronautical and Astronautical University, ErMa Road No. 188, ZhiFu District, Yantai, 264001, China. Electronic address: xingliang_wang@126.com.
authors.forename: Xingliang
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Control Engineering, Naval Aeronautical and Astronautical University, ErMa Road No. 188, ZhiFu District, Yantai, 264001, China. Electronic address: zhangya63@sina.com.
authors.forename: Youan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Control Engineering, Naval Aeronautical and Astronautical University, ErMa Road No. 188, ZhiFu District, Yantai, 264001, China. Electronic address: whl_yy@126.com.
authors.forename: Huali
authors.initials: H
authors.lastname: Wu
keywords: Field-of-view constraint; Guidance; Impact angle control; Integral barrier Lyapunov function; Nonlinear extended state observer; Sliding mode control