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

Design

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

Prototype Construction● Cross-section

torso simulation in hypothetical 2-D setting

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/.

Questions?