Radar Imaging of Target above the Gaussian Random Rough Surface Using the Accelerated MOM/PO Hybrid Method

摘要

In this paper, the range profile analysis for a 3D perfectly electric conductor (PEC) target above a 2D PEC Gaussian random rough surface was successfully implemented using the MOM/PO hybrid method accelerated by the matrix decomposition technique. The numerical scattering model of 3D target/rough surface is constructed by considering the target as the MOM region and the rough surface as the PO region where the RWG vector basis function is employed to expand the induced surface currents. Based on the EM numerical simulation, the wide-band backscattered field of the combined model is obtained using a stepped frequency waveform (SFW), which is produced by linearly sampling the desired bandwidth B at specific frequencies. By performing an inverse discrete Fourier transform (IDFT) on the field data in the frequency domain, the time domain response is provided. Accordingly, the 1-D high resolution range profiles (HRRPs) of the target above the random rough surface is achieved, since the time delay of the signal is associated with the position of the scattering center projected on the line of the sight. The range profiles provide information not only about the position but also the scattering strength of the scattering centers along the range direction.