November 7, 2026
Imaging techniques using radio waves open new horizons in the world of smart devices, after advanced systems demonstrated their ability to monitor objects and people behind obstacles, without the need for traditional cameras or direct vision. These technologies rely on analyzing wireless signals and their reflections through specialized software and artificial intelligence algorithms to transform them into digital models that determine the locations of objects and monitor their movement. Despite the promising capabilities they provide, they raise questions about their accuracy and concerns related to privacy.
These systems send radio waves towards a specific area to capture the reflected signals, where specialized software analyzes their return time and strength to form a digital representation of the scene. However, the monitoring capacity varies depending on the type of walls, their thickness, density and the frequency of the waves, which prevents all barriers from being penetrated. One of the most prominent research developments in this context is the use of home and office Wi-Fi signals to monitor people’s movement. The paths of radio waves change when people move, so that systems pick them up and extract information about directions and gestures through artificial intelligence, knowing that traditional routers alone cannot do this without advanced equipment and software.
This technology is of great importance in search and rescue operations by detecting survivors behind rubble to assist emergency teams, as well as being used in the security field to monitor movement in areas that cameras cannot cover, and enabling robots to recognize the surrounding environment. In smart homes, wireless sensors allow people to be detected to automatically turn on lights or adjust the air conditioning outside of direct vision.
On the other hand, the technology faces technical challenges represented by limited accuracy and difficulty distinguishing between objects, as well as dense walls and metal materials hindering the transmission of signals. Although knowing the presence of a person in a room is much easier than mapping their features, these systems raise serious privacy concerns and the possibility of being used for unauthorized surveillance, which imposes the need for legal and technical controls to protect data. As radar, communications, and artificial intelligence continue to develop, these technologies are expected to become a complementary tool to traditional cameras, giving smart devices unprecedented capabilities to sense the surrounding environment.
