A Nonlinear Impact-Time-Control Guidance law for salvo attack

A novel impact-time-control guidance law based on nonlinear kinematics is presented for an interceptor against a stationary target. Exact closed form expression for the guidance command is derived by introducing an indirect variable, and the performance index of a pseudo-control energy has been minimized to increase the robustness against disturbances appeared at the terminal stage. The implementation of the guidance law involves no estimation of time-to-go procedure but provides for exact time-on-target control. The new guidance law called NITCG(Nonlinear Impact-Time-Control Guidance) can be used in salvo attack where multiple missiles are launched for a simultaneous hit on the target. Numerical simulation results are carried out to verify the performance of the guidance law for different engagement scenarios.