Simulation and analysis of active cancellation stealth based on LFM wave

Active cancellation stealth technology is gaining increasing attention due to its wide applicability, flexibility and its effect which has nothing to do with the shape of the target. A kind of active cancellation system based on linear frequency modulated (LFM) wave was proposed for its technical requirements such as rapid response and low-delay. The phase and frequency of the sampling incident wave were modulated and transmitted, so the synthetizing output of cancellation and original wave are decreased. The electromagnetism principle of active cancellation technology is discussed. The effect of cancellation between plane wave and cylinder wave was simulated based on the scattering source of the ideal electrically conducting infinite cylinder. The conclusion is that the effect of cancellation is influenced by the angle of view and the intersection angle of the two waves and the best result is obtained when the angle is 0°. The output formula of the output signal is derived and the simulation is carried out using MATLAB. Simulation results show that the effect of cancellation is decided by the division of repeating time delay and pulse width, and the width of the output signal is decided by the bandwidth.