Researchers at UC Santa Barbara professor Yasamin Mostofi’s lab have given the first demonstration of three-dimensional imaging of objects through walls using ordinary wireless signal. The technique, which involves two drones working in tandem, could have a variety of applications, such as emergency search-and-rescue, archaeological discovery and structural monitoring.
“Our proposed approach has enabled unmanned aerial vehicles to image details through walls in 3D with only WiFi signals,” said Mostofi, a professor of electrical and computer engineering at UCSB. “This approach utilizes only WiFi RSSI measurements, does not require any prior measurements in the area of interest and does not need objects to move to be imaged.”
The proposed methodology and experimental results appeared in the Association for Computing Machinery/Institute of Electrical and Electronics Engineers International Conference on Information Processing in Sensor Networks (IPSN).
In their experiment, two autonomous octocopters take off and fly outside an enclosed, four-sided brick house whose interior is unknown to the drones. While in flight, one copter continuously transmits a WiFi signal, the received power of which is measured by the other copter for the purpose of 3D imaging.
After traversing a few proposed routes, the copters utilize the imaging methodology developed by the researchers to reveal the area behind the walls and generate 3D high-resolution images of the objects inside. The 3D image closely matches the actual area.
“High-resolution 3D imaging through walls, such as brick walls or concrete walls, is very challenging, and the main motivation for the proposed approach,” said Chitra R. Karanam, the lead Ph.D. student on this project.
This development builds on previous work in the Mostofi Lab, which has pioneered sensing and imaging with everyday radio frequency signals such as WiFi. The lab published the first experimental demonstration of imaging with only WiFi in 2010, followed by several other works on this subject.
“However, enabling 3D through-wall imaging of real areas is considerably more challenging due to the considerable increase in the number of unknowns,” said Mostofi. While their previous 2D method utilized ground-based robots working in tandem, the success of the 3D experiments is due to the copters’ ability to approach the area from several angles, as well as to the new proposed methodology developed by her lab.
The researchers’ approach to enabling 3D through-wall imaging utilizes four tightly integrated key components. First, they proposed robotic paths that can capture the spatial variations in all the three dimensions as much as possible, while maintaining the efficiency of the operation.
Second, they modeled the three dimensional unknown area of interest as a Markov Random Field to capture the spatial dependencies, and utilized a graph-based belief propagation approach to update the imaging decision of each voxel (the smallest unit of a 3D image) based on the decisions of the neighboring voxels.
Third, in order to approximate the interaction of the transmitted wave with the area of interest, they used a linear wave model.
Finally, they took advantage of the compressibility of the information content to image the area with a very small number of WiFi measurements (less than 4 percent). It is noteworthy that their setup consists solely of off-the-shelf units such as copters, WiFi transceivers and Tango tablets.
More information about the project can be found at http://www.ece.ucsb.edu/~ymostofi/3DThroughWallImaging.html The octocopters can be seen in action at https://www.youtube.com/watch?v=THu3ZvAHI9A
Additional information about Mostofi’s research is available at http://www.ece.ucsb.edu/~ymostofi/
At the international GELP Moscow 2017 Summit, which was held in Moscow on 1st to 3rd of November, leaders of Russian and foreign education from 12 states outlined practical steps for systematical change of the global educational environment, taking into account the existing global challenges of civilization.
Global Venture Alliance took part in a closed round table session organized by Forbes Russia.
The authoritative international alliance Global Education Leaders` Partnership (GELP), which influences the development of school education abroad, for the first time, chose Russia as a meeting point for leaders and experts of the world educational community. The official operator of GELP is the Global Venture Alliance.
Global Venture Alliance is the general sponsor of the event on the occasion of the 100th anniversary of the magazine Forbes.
The Global Venture Alliance team on October 17 at the international forum "Open Innovations 2017" in Skolkovo organized a closed signing between RZhD, IBM, NES and NCC in the field of transport logistics.
Tim Cook has not-so-subtly hinted that Apple is working on some sort of augmented reality product. And while ARKit may be the start, a patent application published today hints at what Apple could be picturing down the road.
Apple has teamed up with Australian-based Cochlear to bring iPhone users the first made for iPhone Cochlear implant.
Approved by the U.S. Food and Drug Administration in June, Cochlear’s Nucleus 7 Sound Processor can now stream sound directly from a compatible iPhone, iPad or iPod touch to the sound processor.
Google’s London-based AI outfit DeepMind has created two different types of AI that can use their ‘imagination’ to plan ahead and perform tasks with a higher success rate than AIs without imagination. Sorry if I made you click because you wanted AIs predicted flying cars. I promise this is cool too.
Scientists at MIT are using Wi-Fi and AI to determine your emotional state. They’ve created an algorithm that can detect and measure individual heartbeats by bouncing RF signals off of people.
Yep. Glass is back.
Engineers will soon conduct a crucial test of a futuristic technology championed by entrepreneur Elon Musk that seeks to revolutionize transportation by sending passengers and cargo packed into pods through an intercity system of vacuum tubes.
Uber announced that it will be combining its rides-on-demand business and UberEATS, its food ordering and delivery business, in Russia and neighboring markets, with Yandex.Taxi, the ridesharing business.
Tesla will up its game in the renewable energy storage market with the largest lithium-ion battery storage facility in the world, to be built for Australia’s Hornsdale Wind Farm, with a completion date of December 1, 2017.
Amazon’s Alexa voice platform has now passed 15,000 skills — the voice-powered apps that run on devices like the Echo speaker, Echo Dot, newer Echo Show and others. The figure is up from the 10,000 skills Amazon officially announced back in February, which had then represented a 3x increase from September.
During official talks with his Brazilian counterpart, Michel Temer, in Moscow on Wednesday, Russian President Vladimir Putin hailed the cooperation between the two countries in the field of technologies.
Putin noted that Russia and Brazil already cooperate closely in space exploration and that there are plans to develop cooperation in Earth monitoring from space.