Frequency-Domain Matched Filter Imaging Algorithm for Layered Medium Targets with Array Radar System

‍ ‍In order to realize high-resolution Three-Dimensional （3D） imaging of the internal structure in planar layered media targets， a fast-imaging algorithm based on Frequency-Domain Matched Filter （FDMF） is proposed. The proposed algorithm applies millimeter wave （MMW） Single-Input-Single-Output （SISO） array radar system， using the law that the tangential component of electromagnetic （EM） wave will remain continuous when EM wave propagates between planar layered medium， after transforming the time-domain echo data of each element of the SISO array radar to frequency domain， the radar echo model is simplified. And then transforming the simplified array radar echo from spatial domain to wavenumber domain， and using phase compensation and cumulative summation to realize image. Compared with the improved backward projection （IBP） algorithm which is also suitable for this application， the proposed algorithm can avoid the calculation of refraction points to reduce the computational complexity. Compared with phase shift migration （PSM） algorithm， the proposed algorithm still has some efficiency advantages. The numerical simulation and imaging experimental results show that， the FDMF algorithm can significantly shorten the imaging time on the premise of obtaining the same imaging effect as IBP algorithm.