Researchers train drones to utilize Wi-Fi to see through walls

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Source:   —  June 19, 2017, at 7:04 PM

The one drone blasts Wi-Fi through the structure and another picks up the signal. Then, working in tandem, the two drones fly around the solid structure until it maps the differences in wave strength at different points.

Researchers train drones to utilize Wi-Fi to see through walls

The system is two-fold. The one drone blasts Wi-Fi through the structure and another picks up the signal. Then, working in tandem, the two drones fly around the solid structure until it maps the differences in wave strength at different points. Using this information the researchers have been able to create a 3D model of a closed building.

In the video below you can look the drones idly flying around a brick structure. They cannot look inside. As the waves penetrate the brick they modify as they pass through other structures behind the wall. After a few passes the drones start mapping the all structure in high resolution.

“Our proposed approach has enabled unmanned aerial vehicles to image details through walls in 3D with only WiFi signals,” said Mostofi. “This approach utilizes only Wi-Fi RSSI measurements, doesn't require any prior measurements in the area of interest and doesn't necessity objects to move to be imaged.”

The team was first able to create 2D models of objects using this technique but quickly graduated to 3D models. The system uses off-the-shelf devices including a ordinary Wi-Fi router and a Google Tango tablet. It also uses a Raspberry Pi and Wi-Fi card for the receiver. Drones speak to each other and act autonomously.

While you’re not going to obtain a Predator-like view of living things through walls – yet – this project does have a lot of potential for indoor mapping and emergency situations when you necessity to know what’s interior a building without breaching the door. The researchers even expect some fascinating archeological applications as well.

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