Modelling and analysis of moving helicopter echo

This letter establishes and analyzes the micro-motion echoes of helicopters in different motion states. A moving helicopter echo model was constructed by establishing multiple coordinate systems to construct a state matrix for transformation between coordinate systems and vector decomposition of target velocity. After the simulation, the echo of the helicopter will change when accelerating or decelerating from the time-frequency results of the simulation. The establishment of this model reveals the changes in micro-motion echoes of helicopters under different motion states, which is of great significance for identifying helicopter combat intentions.