Electromagnetic diffraction tomography based on Wi-Fi signals

Wi-Fi imaging achieves object perception in the form of images by analyzing Wi-Fi signals and their channel response. To solve the modeling problem of Wi-Fi imaging, a method based on Wi-Fi electromagnetic diffraction tomography is proposed. Firstly, the Wi-Fi communication system is mathematically modeled, which contains a channel model and channel state information(CSI) indicator, and the CSI matrix of the Wi-Fi system is highlighted. Secondly, the electromagnetic diffraction tomography physical model and its mathematical principles are analyzed, and the imaging algorithm is proposed. Then the hardware platform of the system was built, and the software modification and debugging were carried out. Finally, the CSI was acquired by this hardware system, and this data was processed, including the removal of outliers, noise reduction, and phase correction, and subsequently reconstructed into a clearer contour map by the Wi-Fi electromagnetic diffraction tomography algorithm.