Three-dimensional guidance law with attack angle constraint for maneuverable target

A three-dimensional guidance law with attack angle constraint was designed for maneuverable target. In order to unfold coupling of line of sight, three-dimensional relative geometry relation between missile and target was constituted in spherical coordinates. With a view of research on no-coplanar relative geometry, three-dimensional guidance law with attack angle constraint was presented by using the sliding mode control theory. And the three-dimensional guidance law was improved to overcome chattering defect. In considering varying acceleration of maneuverable target, a self-adaptive regulative rule of guidance parameter was given according to experiential information. Simulation results show that this three-dimensional guidance law can hit maneuverable target at vertical attack angle with preferable robustness and adaptability for varying accelerated target.