Hardware-in-the-loop simulation for an active missile

A hardware-in-the-loop simulation has been developed to eval uate the performance of active missiles from prelaunch to inter cept. The facility is used for system integration, design verifica tion, preflight and postflight analysis, and demonstrations of systems performance.

A CDC Cyber 175 general-purpose computer interfaced with an Applied Dynamics International AD-10 multiprocessor solves the six-degree-of freedom simulation in real time. The simulation includes the target model, the missile model, and relative motion. The Cyber 175 also drives the model of the RF environment through a Hewlett Packard 1000 computer.

The model of the RF environment provides the necessary phase and amplitude control to reproduce a 10-point glint model. The facility also can receive an active transmission and can supply four independent returns separated in range, angle, and velocity. The simulation has not yet undergone a formal validation program, but the facility results have been compared to an all- mathematical simulation of an active missile. Initial comparisons with flight results support the credibility of the facility.