A Case Study of Misalignment Errors for Range-Migration-Based Microwave Imaging With Multistatic Dynamic Metasurface Apertures

In this paper, we study the effect of antenna positioning errors for a multiple-input multiple-output (MIMO) dynamic metasurface aperture (DMA) system. In this case, the term antenna refers to transmitting or receiving DMA panels that comprise the imaging system. The range migration algorithm (RMA) along with a multistatic-to-monostatic (MTM) interpolation step is employed to address the image reconstruction step. Both the RMA and the MTM steps entail knowledge of the precise locations of the panels with respect of the center of the investigation domain. However, in practical applications, this requirement is not always met and displacement errors can be present. In this work, we study the behavior of the proposed DMA-based multiple-input multiple-output (MIMO) computational imaging (CI) system and image reconstruction algorithm under various range displacement or rotational errors.