Could drones get X-ray vision through Wi-Fi?

Radio signals that see through walls might end up on drones

Researchers have developed mobile robots that can use Wi-Fi signals to effectively "see through" walls. It's raising the possibility of flying drones using the technology to see inside buildings.

Led by Yasamin Mostofi, a professor of electrical and computer engineering, the group at the University of California, Santa Barbara (UCSB) has shown how the radio signals sent and received by a pair of wheeled robots can provide information about what lies behind concrete walls even when the objects do not move.

Depending on their properties, objects behind a wall will attenuate the radio signals. As the robots make multiple passes around on either side of a walled-off area, one robot measures signals broadcast by the other.

Differences in signal strength can reflect the presence of hidden objects, according to the researchers, who formulated a wave-propagation model for the project.

The approach, which has a targeted resolution of 2 centimeters, can show the location and shape of hidden objects, and has the potential to classify them as wood, metal or human.

Researchers at MIT previously developed a similar X-ray-style technology using Wi-Fi signals that they called Wi-Vi, but it's designed to track moving objects or people. Mostofi's group wants to be able to get a view of what lies behind thick walls made of brick or concrete.

"We have been interested in truly seeing through walls, meaning seeing every square inch on the other side with high accuracy, figuring out where all the objects are, as well as their geometry and material type, without any prior knowledge," Mostofi wrote in an email.

"With Wi-Fi signals everywhere, it is very important to understand what they can naturally tell us about our environment. Also, with robots/drones becoming more and more part of our near-future society, it is just natural to see what the automation of this process can do."

Drones have already been mooted as vehicles for providing Wi-Fi to remote areas as well as potential rogue access points that can steal data from wireless networks.

Mostofi's group is now experimenting with a commercial aerial drone to see how well it can perform the X-ray feat. Multiple drones could be used to scan a concealed area, Mostofi said, or the receiver could be a ground-based robot or fixed node.

"In principle, this should also give us a nice 3D view, because you can change the height, as opposed to 2D imaging," she said.

The UCSB system could be used for applications including search and rescue, detecting potential home intruders before entering a house or as health-monitoring systems for elderly patients.

One limitation of the technology is that as the area to be scanned gets more cluttered or larger, the accuracy of the imaging can go down, Mostofi said.

She and collaborators plan to work on improving the approach before it can be commercialized, which would depend on the application and the degree of accuracy needed.

Join the Good Gear Guide newsletter!

Error: Please check your email address.

Tags Santa BarbararoboticsUniversity of California

Our Back to Business guide highlights the best products for you to boost your productivity at home, on the road, at the office, or in the classroom.

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Tim Hornyak

IDG News Service
Show Comments

Cool Tech

D-Link TAIPAN AC3200 Ultra Wi-Fi Modem Router (DSL-4320L)

Learn more >

D-Link PowerLine AV2 2000 Gigabit Network Kit

Learn more >

Crucial® BX200 SATA 2.5” 7mm (with 9.5mm adapter) Internal Solid State Drive

Learn more >

ASUS ROG Swift PG279Q – Reign beyond virtual world

Learn more >

Lexar® Professional 1000x microSDHC™/microSDXC™ UHS-II cards

Learn more >

Gadgets & Things


Learn more >

Lexar® Professional 1000x microSDHC™/microSDXC™ UHS-II cards

Learn more >

Lexar Professional 2000x SDHC™/SDXC™ UHS-II cards

Learn more >

Family Friendly

ASUS VivoPC VM62 - Incredibly Powerful, Unbelievably Small

Learn more >

Lexar® Professional 1000x microSDHC™/microSDXC™ UHS-II cards

Learn more >

Lexar Professional 2000x SDHC™/SDXC™ UHS-II cards

Learn more >

Stocking Stuffer

Lexar® Professional 1000x microSDHC™/microSDXC™ UHS-II cards

Learn more >

Lexar Professional 2000x SDHC™/SDXC™ UHS-II cards

Learn more >

Christmas Gift Guide

Click for more ›

Most Popular Reviews

Best Deals on Good Gear Guide

Latest News Articles


GGG Evaluation Team

Kathy Cassidy


First impression on unpacking the Q702 test unit was the solid feel and clean, minimalist styling.

Anthony Grifoni


For work use, Microsoft Word and Excel programs pre-installed on the device are adequate for preparing short documents.

Steph Mundell


The Fujitsu LifeBook UH574 allowed for great mobility without being obnoxiously heavy or clunky. Its twelve hours of battery life did not disappoint.

Andrew Mitsi


The screen was particularly good. It is bright and visible from most angles, however heat is an issue, particularly around the Windows button on the front, and on the back where the battery housing is located.

Simon Harriott


My first impression after unboxing the Q702 is that it is a nice looking unit. Styling is somewhat minimalist but very effective. The tablet part, once detached, has a nice weight, and no buttons or switches are located in awkward or intrusive positions.


Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?