DOI: 10.1109/TMTT.2023.3329722   IEEEXplore: https://ieeexplore.ieee.org/document/10316258    

Millimeter-wave holographic imager with an arbitrary MIMO array

85 – 105 GHz

Digital focusing method that applies dimensional reduction techniques and fast Fourier transform algorithms (DF-DR-FFT) to significantly speed image focusing and reconstruction reduces computational complexity from O (N6) to O (N3 log N). The discretization interval dr has been analyzed to give insight into absolute phase error objectives and image quality vs. dr considerations. In general, phase error must be controlled to 4/π, and dr ≤ λ/8.

Medical diagnosis, nondestructive testing, driving assistance and safety inspections.

109-fold acceleration for cross-orthogonal arrays compared to conventional digital focusing techniques, 433-fold acceleration for a 1-D MIMO scanning array.