Simulation research of longitudinal glide-down control system about helicopter deck landing

Longitudinal glide down control system of helicopter is designed by linear quadratic gaussian /loop transfer recovery(LQG/LTR), which include establishment of helicopter and augmented system model, attainment of frequency domain robustness bounds, design of feedback loop and recovery of loop transfer at the output. On the basis of this control system, simulation software is used to perform numerical simulation. Finally, some results with engineer value have been gotten through analysis on the change curves of helicopter's altitude and velocity with helicopter ship distance and time.