Effective algorithm for calculating flight firing data for long range interception

The traditional methods of firing data which only focus on final hitting accuracy and ignore the target motion trend with high speed are easy to lead to overloading saturation during the terminal phase of intercept, even decrease intercepting efficiency. To solve this problem, in view of ground-based long range interceptor propelled by solid fuel engine with multi-stages, this paper combines analytical calculation and data fitting to design an online firing data calculation algorithm based on prediction intercept point (PIP). First of all, the algorithm analytically solves the shutdown point parameters based on the ellipse trajectory theory by introducing the speed intersection angle between interceptor and target when interceptor arrives at PIP, designs convergence strategy to quickly determine launch time by using constraint condition of flight time from target to PIP, and calculate the azimuth initial value. Then, initial firing data solution was completed by combining with the established offline approximate analytic polynomial. Finally, the exact firing data value was determined through a few iterations by using Newton method. 6DOF simulation show that the algorithm not only has a good online ability to intercept high precision, but applies to a wide range of mobile launchers.