A linear/nonlinear hybrid differentiator and application for DSGC system

A hybrid differentiator based on linear and nonlinear parts is introduced. A deeply strapdown guidance and control (DSGC) system for low-cost munitions is presented using body-fixed seeker and miniature inertial measurement unit (MIMU). The three-dimension line-of-sight (LOS) dynamics for guidance command are described using the missile-target geometry. Due to the weakness of strapdown seeker, the aforementioned hybrid differentiator is then introduced to obtain and filter the inertial LOS rate for proportional guidance law. The analysis and trajectory simulation results verify the performance of the proposed algorithm.