Design of Nonlinear Guidance Law for Torpedo

The key for torpedo to implement target pursuit is to design high performance guidance law. Based on equations of relative movements between torpedo and target , some state equations are built and a appropriate evaluation output signal is selected.Then using the H∞ control theory , a nonlinear H∞ guidance law for torpedo and the normalload are obtained by solving HamiltonJacobi inequation. Simulation is performed to verify the above research , and the result shows that the guidance law can help torpedo overtake target in a short time with light normalload. So the guidance law is effective for torpedo pursuit with high robustness. Therefore it can be used in design of guidance law for torpedo and anti-torpedo torpedo.