Abstract
The problem that two cooperative missiles intercept a maneuvering target while imposing a desired relative geometry is investigated in the paper. Firstly, a three-dimensional (3D) estimation model for cooperative target tracking is proposed and the observability of the missile-target range measurement is analyzed. In order to enhance the estimation performance, a two-level cooperative interception guidance architecture is proposed which combines a coordination algorithm with a novel 3D fixed-time convergent guidance law considering line of sight (LOS) angle constraints, such that the desired relative geometry can be imposed quickly and steadily by a dynamic strategy. The effectiveness and superiority of the proposed guidance law is evidenced through the numerical simulations comparing with other guidance laws.
Highlights
With the advancement of aerospace technology and industry, highly sophisticated aerial aerobats such as tactical ballistic missiles, hypersonic vehicles, and unmanned aerial vehicles pose severe challenges to the air-defense missile systems owing to their high maneuverability and weak observability [1]
Motivated by the previous discussion, this study aims at developing a 3D cooperative interception guidance law to impose a desired relative geometry between the missiles and target, and enhance the estimation performance of cooperative target tracking
The performance of the proposed three dimensional cooperative interception guidance law is evaluated via numerical simulation, using the nonlinear kinematics dynamics for the missiles and target
Summary
With the advancement of aerospace technology and industry, highly sophisticated aerial aerobats such as tactical ballistic missiles, hypersonic vehicles, and unmanned aerial vehicles pose severe challenges to the air-defense missile systems owing to their high maneuverability and weak observability [1]. Because no information about the range is available, the target tracking performance is limited, especially in the presence of target maneuver, which may result in an unobservable system [2]. Take advantage of the concept of cooperative interception, the triangulation structure formed by the interceptor missiles and the target can be exploited to improve the estimation performance. With information sharing between the interceptor missiles, the range between the interceptor and target can be calculated respectively and serve as a pseudomeasurement to improve the estimation performance. The observability of the missile-target range, strongly depends upon the separation angle between the two interceptors relative to the target. As is analyzed in [3], when the separation angle becomes small (close to zero), the variance of the calculated range increases rapidly, making the triangulation technique fails and the estimation system unobservable. The relative geometry between the missiles and target, and the implemented cooperative guidance laws have great influences on the estimation performance of cooperative target tracking
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