Research on guidance law for cooperative attack of multiple missiles

To enhance the penetration and hitting capacity of anti-ship missiles attacking the target cooperatively, a cooperative guidance law composed of a cooperative range-to-go guidance law and a guidance law making line-of-sight (LOS) angle-rate approach zero was proposed. The desired range-to-go was designed based on current range-to-go of each missile. Then the nonlinear relative motion model between missile and target on the basis of proportional navigation guidance law was built, and it was divided into a fast subsystem and a slow subsystem according to the time-scale separation method. Feedback linearization of two subsystems was realized based on dynamic inverse system theory. The guidance law that made multiple missiles' range-to-go approach and keep the desired range-to-go was designed adopting linear system theory. To ensure missiles to hit target precisely, another guidance law was proposed based on the finite time control theory, which made the angle-rate of LOS of every missile approach zero quickly in finite time while the range-to-go decreased gradually. Simulation results show that adopting the cooperative guidance law can make multiple missiles fly to the target synchronously and hit the target almost at the same time, and the cooperation of range-to-go and impact time are realized effectively.