Through-the-Wall Imaging Exploiting 2.4GHz Commodity Wi-Fi

TL;DR

This paper demonstrates a low-cost method for through-the-wall imaging using commodity Wi-Fi signals and holographic imaging techniques, employing a synthetic aperture and FBP algorithm for image reconstruction.

Contribution

It introduces a novel approach to indoor through-the-wall imaging utilizing standard Wi-Fi signals and a holographic imaging framework with experimental validation.

Findings

Successful imaging through walls using Wi-Fi signals

Effective use of synthetic aperture and FBP algorithm

Demonstrated feasibility with commodity Wi-Fi devices

Abstract

In this letter, we experimentally investigate a low-cost through-the-wall imaging exploiting Wi-Fi signals in an indoor environment from the perspective of holographic imaging. In our experiments, a pair of antennas in a synthetic aperture mode is used to acquire signals produced by commodity Wi-Fi devices and reflected from the scene in a synthetic aperture mode. The classical filtered back propagation (FBP) algorithm is then employed to form the image based on these signals. We use an IEEE 802.11n wireless router working at 2.4GHz with bandwidth of 20MHz. Selected experimental results are provided to demonstrate the performance of the proposed Wi-Fi based imaging scheme.