Calculating flight program and launch time window for intercept missile

The flight program and launch time window for intercept missile vary with any influence factors such as the launch position, predict hit points, and so on. So it´s necessary to find a fast algorithm in calculating the flight program and launch time window for improving combat capability. Considering influence factor of rotation of the earth, geostrophic force, and the J2 perturbation, three-dimensional dynamics for intercept missile were presented. In this article we find a fast algorithm in calculating the flight program and launch time window based on least-squares iteration, and the simulation results show that this algorithm is valuable to engineering application.