State-space based modeling and simulation of airborne platform survivability with countermeasure system

The paper presents three-body interception simulation model, to study the survivability of airborne target against an interceptor, by launching a repeater-type countermeasure system termed as deceiver. State space representation of interceptor, target dynamic states along with autopilot, RF seeker is developed for three-dimensional engagement scenario. The trajectory of deceiver released from target is presented by propagating the discrete-state translational equations of motion. Classical proportional navigation guidance steers the interceptor towards the airborne moving target (or deceiver) based on the echo power received computed using Friis transmission formula. Effective jamming capability of deceiver on interceptor at different seeker acquisition ranges is indicated by ratio of power received from deceiver and target known as jammer-to-signal ratio. Numerical simulations are conducted to study the survivability chances of platform, when the deceiver is deployed from the target aircraft with interceptor approaching from side, head-end, tail-end, top. Miss distances of interceptor from platform and deceiver, interceptor lateral acceleration limits are presented. Monte carlo simulation studies are performed, and probability of platform survival when deceiver is released at different homing ranges of interceptor, as well as for deceiver amplifier gain variations are presented. This study also provides important system design parameters such as deceiver operation time to decide the battery specifications for electronics, and subsequently the overall system design.