Impact Angle and Time Control Guidance Under Field-of-View Constraints and Maneuver Limits

Field-of-View Constrained Impact Time Control Guidance via Time-Varying Sliding Mode Control

“…As an extension of [12], the authors of [13] designed an ITCG law of a BPNG structure considering the FOV constraint and uncertain system lag. In [14], an ITACG law with FOV constraint is presented. This guidance law consists of two terms: one is used to achieve zero miss distance and impact angle constraints, and the other is used to achieve impact time constraint.…”

“…The FOV constraint is guaranteed by the varying-gain approach. Different from [14], an ITACG law with FOV constraint is derived based on the look angle shaping technique in [15]. In [16], the authors consider the three-dimensional impact time control problem.…”

“…Through optimal control theory, an ITCG law with FOV constraint in three-dimensional space is obtained. Although [12][13][14][15][16] consider the FOV constraint, they require a small angle assumption and time-to-go estimation, which is not what we want. In [17], a PNG law with time-varying navigation gain is presented.…”

“…Due to the open-loop structure of the proposed guidance law and the insufficient utilization of the maximum detection capability of the seeker, the guidance law is modified to a closed-loop structure, and the maximum detection capability of the seeker is more utilized. The main advantages of the proposed ITCG law with FOV constraint are summarized as follows: First, compared with [12][13][14][15][16], the proposed method does not require the small angle assumption and time-to-go estimation, which avoids the degradation of guidance law performance caused by estimation error. Second, compared with [17][18][19][20], the proposed method can make more use of the seeker's maximum detection capability when the initial lead angle is far less than the maximum look angle of the seeker.…”