PROJECT TITLE :

A New Guidance Law for the Defense Missile of Nonmaneuverable Aircraft

ABSTRACT:

In this transient, a replacement guidance law for the defense missile of nonmaneuverable aircraft is formulated based mostly on dynamic game considerations. 1st, a straightforward differential game of protecting a static target in a pair of-D, involving simple motions for the attacker and defender, is introduced. The analysis is then extended to a moving noncooperative target in two-D, in view of the very fact that a nonmaneuverable aircraft would not be ready to cooperate with the defender. A heuristic resolution for the game is proposed and tested, and therefore the results of the 2-D analysis are then extended to three-D to formulate a brand new steering law for the defense missile called the command to optimal interception purpose (COIP) steerage law. The validity of the new guidance law is checked using trajectory and envelope simulations, engineered with high-fidelity six-DOF models using the computer-aided design of aerospace concepts in C++ framework. Performance comparisons are shown between the COIP steering law and the recently proposed airborne command to line-of-sight (A-CLOS) steering law. The results show that the performances of COIP and A-CLOS guidance laws are virtually identical in an exceedingly coplanar engagement situation, but the COIP law has the extra advantage of working with solely position info, without the knowledge of motion of the players. Further, in a very noncoplanar engagement case studied, the defense missile is shown to realize intercept using the COIP guidance law, but fails when using the A-CLOS steering law.