通过虚拟阵元进行DOA估计，FIR 底通和带通滤波器和IIR 底通和带通滤波器，插值与拟合，解方程，数据分析，合成孔径雷达（SAR)目标成像仿真，数据模型归一化，模态振动，是信号处理的基础。- Conducted through virtual array DOA estimation, Bottom-pass and band-pass FIR and IIR filter bottom pass and band-pass filter, Interpolation and fitting, solution of equations, data analysis, Synthetic Aperture Radar (SAR) imaging simulation target, Normalized data model, modal vibration, Is the basis of the signal processing.