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Advanced Imaging Technology Radar Security Sensing
Shiva Nathan, Westford Academy
Lingrui Zhong, Lexington High School
Prof. Carey Rappaport, Electrical and Computer Engineering
Goal● Design a multistatic radar system for higher
definition
● Walk-through scans
● More security and convenience while non-disruptive
Radar Basics● Transmission and reception of radio waves
● Monostatic vs. multistatic
● Wide signal range: ~120º
Previous: X-Ray● X-Ray backscatter
o Generate ionizing rayso Analyze reflections of rays
● Privacy concerns● Currently for luggage only
Current Situation● Portal Based Millimeter-
wave scanner● Analyzes reflected radio
waveso Slows down passenger
movement o Low success detection
rateo Requires more
transmitters and receivers for high-quality images
Terahertz-Wave Scans● Submillimeter-wave scan
● 1,000,000,000,000 cycles/second - 1 trillion hertz
● Health concerns:o Resonant effects could unzip DNAo Interfere with DNA replication and gene
expressiono POTENTIAL THEORIZED RESULTS ONLY
Assignments● Generating outlines of object based on radar
reflections
● Simulating movement of radar waves for the two systems 2-dimensionally using MATLAB
● Assisting construction of prototype
MATLAB● Programming language for mathematical
operations
● Multi-operation, multi-input calculations
Portal System Simulation Object contour based on radar reflections● Monostatic● Tangent points● Spline
New System Simulation ● Simulate movement of radar around ideal body
o Shows unreflected pathways● Visualise radar
Analysis● Algorithms created accurate simulations with
very little input
● Worked best with graphable objects
● Multistatic radar is theoretically superior
● Still need to develop multistatic prototype
Assignments● Generating outlines of object based on radar
reflections
● Simulating movement of radar waves for the two systems 2-dimensionally using MATLAB
● Assisting construction of prototype
Future Work● Expand the simulations from 2D to 3D
● Simplify algorithm and implement object shapes beyond ellipses
● Add simulation of deflected pathway and more complex analysis
● Apply the simulation to the physical prototype
Special Thanks to:
● Dr. Carey Rappaport
● Masoud Rostami, Mohammad Nemati, Kurt Jaisle, Jake Messner
● YSP director: Claire Duggan
● YSP coordinators: Maddy Leger, Maureen Cabrera
Thanks for listening!
References● Accardo, J., & Chaudhry, M. (2014). Radiation exposure and privacy concerns surrounding full-body
scanners in airports. Journal of Radiation Research and Applied Sciences, 198-200.
● Alexandrov, B., Gelev, V., Bishop, A., Usheva, A., & Rasmussen, K. (2009). DNA breathing dynamics in the presence of a terahertz field. Physics Letters A, 1214-1217.
● Gonzalez-Valed, B., Martinez-Lorenzo, J., & Rappaport, C. (2014). On-the-Move Active Millimeter Wave Interrogation System Using a Hallway of Multiple Transmitters and Receivers [Powerpoint slides].
● X-ray backscattering image: http://techfreep.com/images/backscatter.jpg
● Multistatic diagram: https://commons.wikimedia.org/wiki/File:Multistatic_system.jpg
● Mm-wave diagram: http://www.scientificamerican.com/article/weapons-revealed/.