A study of the possible use of hybrid rocket systems as targets in ballistic missile defense tests

This study analyzes the possibility of developing a ballistic missile target system based upon a hybrid rocket configuration. Background information regarding the need for improved targets is provided, as well as the reasons why hybrid rockets seem ideally suited for this application. An unclassified Threat configuration was defined, and a hybrid propulsion system modeled on a liquid oxidizer/solid fuel configuration was designed within the physical envelope established for this Threat. Performance requirements and design constraints were used to evaluate the hybrid system based on geometric and trajectory criteria. Hydrogen peroxide (H₂O₂) and hydroxyl-terminated polybutadine (HTPB) were chosen as the propellants. Engine performance was estimated using a simple numerical integration method, and a 3-DOF trajectory was generated using the target model and an existing analysis tool. The final results of this proof-of-principle study indicate that a hybrid rocket should make a viable target and is worthy of a more comprehensive analysis.