基于线性调频波的有源对消隐身仿真及分析

有源对消隐身技术由于其适用性广、灵活主动及不破坏目标外形等特点而受到重视。针对其技术要求中的快速反应、延时较短的特点，提出了一种基于线性调频（LFM）波的对消系统方案。该方案对入射波采样后进行相位和频率的调制，然后直接转发,使其匹配滤波输出与原入射波的回波输出进行对消；探讨了有源对消技术的电磁学原理并以理想导电无限长圆柱为散射源，对平面波与柱面波的对消效果进行了仿真验证，得出不同视角、平面波与柱面波的夹角都会对对消效果产生影响的结论，且在两列波夹角为0°时达到最佳；推导了进行相位与频率调制的对消后信号输出公式，并利用MATLAB对其进行了仿真验证，结果表明，对消后输出信号峰值由时延脉宽之比决定，带宽对输出信号主峰的宽窄程度有直接影响。

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.