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Guidance and control of a submarine-launched cruise missile

Köklücan, Semih
A typical mission profile of submarine-launched cruise missiles begins with the launch phase which covers the motion of the missile from the launch to the water-exit and continues with the boost phase which lasts from the water-exit to the beginning of the cruise phase. In order to achieve the desired range of the launch and boost phases, efficient utilization of available energy which carries the missile to the beginning of the cruise phase is necessary. For this purpose, this study presents a new approach for energy-optimal control of the underwater and air motion of a submarine-launched cruise missile. In this approach, the aforementioned problem is modeled and solved as a minimum-effort optimal control problem. Then, the effects of initial and final conditions on energy need are investigated, and the optimal conditions that result with the minimum energy need are determined. Besides that, to control the motion of the missile from the sea surface to target, proportional-integral-derivative (PID), linear quadratic regulator (LQR) and pole-placement based autopilots are designed and compared with each other. Prior to the guidance and control design steps, six degrees of freedom (6 DOF) motion equations are derived, then the hydrodynamic and aerodynamic parameters are retrieved. The nonlinear 6 DOF motion model is simplified and linearized before minimum-effort optimal control design and autopilot studies. Results of the designed guidance and control strategies are presented through the nonlinear 6 DOF simulations. Finally, some comments are made and future studies are mentioned based on theoretical and simulation studies.