On control allocation of reentry warhead with hybrid actuators

In order to improve the impact accuracy and ability of the mobile penetration of reentry warhead, hybrid actuators with moving masses(MMs) and single gimbal control moment gyoscopes(SGCMGs) are used to produce enough torque for attitude control during the whole reentry process. Based on analysis of the torque generation mechanism of MMs and SGCMGs, a control allocation law is designed for the hybrid actuators, it includes two steps: first step is the moment allocation, which follows the principle of using MMs as main approach and SGCMGs as auxiliary approach, and the attitude control moment is distributed to the MMs and SGCMGs; second step is order allocation, according to the hybrid actuators kinematic models, each moment is decomposed into the position order of the MMs and gimbal angular velocity order of the SGCMGs. Simulation results of a certain warhead demonstrate that the hybrid actuators can satisfy the torque demand during the reentry process, and achieve the complementary strengths of the MMs and SGCMGs.