Page 1 A System-of-Systems Design of a Guided Projectile Mortar Defense System Kevin Massey 1 , Michael Heiges 2 , Ben DiFrancesco 3 Georgia Inst. of Technology/GTRI/ATAS, Atlanta, GA 30332-0844 Tommer Ender 4 , Dimitri Mavris 5 Aerospace Systems Design Laboratory, Georgia Institute of Technology, Atlanta, GA 30332-0150 A System-of-Systems design methodology is used to evaluate tradeoffs in the design of a guided bullet system for mortar defense. Guided bullets were designed to match the calibers of four different existing auto guns and were modeled in a six degree of freedom simulation. A bullet guidance system was developed based on proportional navigation and several control actuation schemes were modeled. The system simulation was setup to perform Monte Carlo analyses with noise models for various subsystems such as the gun controller and radar. Ranges of gun accuracies and ranges of radar noise were used to create a design space which also included the variation in gun caliber. A design of experiments approach was used to determine the simulation cases that needed to be run to map out the design space. Based on more than half a million independent simulations, a metamodel of the design space was created to capture the interactions between the gun, the projectiles, and the radar. This metamodel allows the user to rapidly evaluate the impact of design tradeoffs and to determine the best system based on his chosen metrics. Available metrics include, cost, weight, defended area, and combinations of the three. Initial results indicate that feasible designs for a guided bullet system are possible within the design space. I. Introduction he nature of warfare for the United States has changed considerably in recent years. A traditional large-scale, symmetric conflict is a prospect that the U.S. is unlikely to face in the foreseeable future. Those enemies who might otherwise consider open war on America are restrained by the high probability of defeat associated with facing what is arguably the most advanced military in the world. Opponents have thus turned toward more asymmetric tactics. Relying on patience, anonymity, and the contrivance of fear, recent enemies of the United States hope to disrupt and demoralize while avoiding direct confrontation with the military. Mortars are easily transported, simple to operate, and indirect fire weapons, which enable deployment from areas which are hidden and outside the line of sight of intended targets. Their projectiles are “dumb” in the sense that once launched they follow a ballistic trajectory, making them immune to counter-guidance techniques. Fortunately, these characteristics also reduce the accuracy of these weapons. Currently, the best way to defend against mortars is to identify and destroy the source, which can prove daunting given the effective range, compactness, and mobility of mortar launchers. Another approach is to destroy the mortar in flight, consequently, mid-air interceptors are receiving significant consideration. The use of unguided interceptors can be effective against mortars though at limited range; the purpose of guiding the interceptors is to extend this range and thus expand the defended area of a single gun. Given these circumstances, it is the goal of this program to analyze the possible effectiveness, feasibility, and cost of using guided supersonic munitions, maneuvered by pin based actuators developed at the Georgia Tech 1 Senior Research Engineer, Aerospace Transportation Advanced Systems Laboratory, GTRI, Smyrna, GA, 30080, Associate Fellow AIAA. 2 Senior Research Engineer, ATASL, GTRI, Smyrna, GA, 30080, Associate Fellow AIAA. 3 Research Assistant, Georgia Inst. of Technology/GTRI/ATAS, Atlanta, GA 30332-0844, Student Member, AIAA. 4 Graduate Research Assistant, Aerospace Systems Design Laboratory, Student Member, AIAA. 5 Boeing Professor of Advanced Aerospace Systems Analysis, Director, Aerospace Systems Design Laboratory, Associate Fellow AIAA. T 24th Applied Aerodynamics Conference 5 - 8 June 2006, San Francisco, California AIAA 2006-3652 Copyright © 2006 by Georgia Tech Research Institute. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.