Efficient Millimeter Wave Holographic Reconstruction Based on Pre-Ranging of Target

In millimeter wave (MMW) imaging systems, matched filtering requires the distance between the object and the antenna array. Otherwise, it needs to be reconstructed within a much wider distance range, which results in low computational efficiency. Therefore, we propose a method that can accurately solve the distribution range of the target in the distance dimension to avoid the inversion over a wider propagation distance range. Compared with existing algorithms, this method significantly improves computing efficiency.