Research on strapdown seeker target line-of-sight angular rate extraction method based on improved tracking differentiator

With a view to solve the problems that the strapdown seeker cannot directly provide the radial velocity required for guidance due to its fixed connection with the projectile, and the traditional filtering method has delay deviation and low filtering accuracy, the research on the extraction method.The target sight line angular rate of the strapdown seeker is carried out. As part of this study, an improved second-order discrete system control synthesis function is proposed, a phase advance compensator is designed, and a moving average filtering algorithm is introduced, and finally an improved tracking differential is formed. The simulation results indicate that the improved the tracking differentiator can continuously and smoothly differentiate the sight line angle calculated under the inertial frame, and obtain the accurate sight line angular rate.