Impact Angle Constrained Integrated Guidance and Control for a Dual-controlled Interceptor

In this work, we address the problem of an angle-constrained interception within an integrated guidance and control framework. We consider a dual-controlled interceptor (an interceptor equipped with canard and tail aerodynamic control surfaces), and design fin deflection commands directly to effect the lateral acceleration needed to steer the interceptor on a course leading to interception of a stationary target with constrained impact angle. We use a weighted effort allocation scheme that apportions the available effort in canard and tail surfaces to generate the required lateral acceleration. With an additional degree of freedom, our design exhibits fault-tolerance and is also capable to address other objectives. We present the overall design using sliding mode control to make the design insensitive to modeling errors and parametric uncertainties. We, further, demonstrate the efficacy of our design via numerical simulations.