A Novel Partial Integrated Guidance and Control Scheme Based on Three Dimensional Relative Dynamics

A six-degree-of-freedom (6DoF) reduced-order partial integrated guidance and control (PIGC) scheme based on three dimensional (3D) relative dynamics is proposed in this paper. An analytical integrated design model (AIDM) with respect to the components of vehicle acceleration in the ballistic frame and vehicle’s three-channel body rates is deduced. A novel 3D coupling relative dynamic model between the target and flight vehicle is established based on the accurate coordinate transformations and AIDM. The commanded body rates are directly obtained by making first-order derivatives of elevation and azimuth angles of the line-of-sight (LOS) to converge to zero. Desired control surfaces are generated with the help of sliding mode control method and an expedient control allocation. The AIDM supersedes the traditional tracking processes of roll, yaw, and pitch angles, simplifies the design course of guidance and control system, and reduces the number of designed parameters. Finally, the effectiveness and robustness of the newly proposed guidance and control scheme are validated and verified via 6DoF nonlinear simulations.