ISAR的短时傅立叶变换程序，用于ISAR成像时的频率估计-ISAR the short-time Fourier transform procedures, ISAR imaging for the estimated frequency

运用EMd算法实现了信号的处理，并且对信号进行傅里叶变化获得其频域特征，冲采样后获得特征参数建立神经网络与实验进行识别- EMd use signal processing algorithm, and the Fourier transform of the signal in the frequency domain to obtain its characteristic red after sampling to obtain the characteristic parameter