Optimal design of nominal attack of angle for re-entry vehicle

The design of nominal attack of angle is important for re-entry vehicle. It is also a challenge because of constrains such as air heating, loading and dynamic pressure. A rapid optimal design method for nominal attack of angle was proposed. First the path constrains were converted into control constrain for attack of angle. Then the attack of angle was parameterized by four parameters. The genetic algorithm was used to obtain the initial guess of parameters. Finally the re-entry trajectory was solved by sequential quadratic programming(SQP) technique. The simulation results show that the method finds the optimal nominal attack of angle quickly and can be used for the re-entry trajectory optimization and guidance researches.