Robust proportional navigation guidance against highly maneuvering targets

A robust proportional navigation guidance law is proposed by using Lyapunov approach. Proportional navigation guidance(PNG) law is popularly adopted for missile guidance because it is powerful and simple to implement. In fact, it has been shown that PNG is optimal solution for a stationary target. But PNG performance may sharply degrade in the presence of highly maneuvering target. To find estimation of the miss distance, an optimal approach is used. Then switching control is derived by using this estimation of miss distance. The proposed robust guidance has the form of combination of the conventional PNG and the switching part. Several nonlinear engagement simulations show that the proposed guidance law is robust to the highly maneuvering target.