合成孔径雷达（SAR)目标成像仿真，小波包分析提取振动信号中的特征频率，基于分段非线性权重值的Pso算法。- Synthetic Aperture Radar (SAR) imaging simulation target, Wavelet packet analysis to extract vibration signal characteristic frequency, Based on piecewise nonlinear weight value Pso algorithm.