Tomography System Using sub-THz Radio Links and Cameras

This paper proposes a radio tomography system for objects using a camera and sub-terahertz (THz) measurement setup. Unlike conventional reflection-based radar imaging or penetration-based tomography, our system analyzes variations in the radio signal attenuated by a freely and randomly moving object within the line-of-sight (LoS) region of the radio link. The tomography images are reconstructed by synchronizing the object movements captured from the camera with the recorded sub-THz radio measurement attenuation values and performing interpolation. When tested with a set-up at 300 G Hz frequency, 2 dBm transmit power, 30 cm radio link distance, and sweep time of 400 s, the proposed system successfully demonstrates tomography construction of various objects in the LoS region with greater than 99% high spatial resolution accuracy. Also, the proposed approach effectively sees through the objects to identify the internal objects, their composition, and thickness.