Fixed-Time Circular Impact-Time Guidance with Look Angle Constraint

A fixed-time nonlinear circular guidance law that satisfies the impact time constraint is proposed. By utilizing geometric principle length of a arc connecting missile and target can be analytically calculated, exact expression time-to-go obtained. Thus, error shaped to zero, intercept at desired time, which crucial in salvo attack. The settling proved bounded by fixed does not depend on initial conditions, but only determined two parameters. Moreover, criteria for choosing parameters values are established analytically, rather than trial-and-error or empirically, provide valuable guidelines designers. To address look angle constraint, deviated pure pursuit (DPP) employed, switching logic between laws provided. Unlike many existing control laws, formulation one proposed based engagement kinematics, implementation execute numerical calculations, improve accuracy reduce computation burdens system. series simulations implemented verify effectiveness law.