A DIY Synthetic Aperture Radar System

Thought the members of IEEE AP-S Boston Chapter would like to check out this project:

Recently i presented a briefing at the MIT Haystack Observatory open lunch on how to build your own synthetic aperture radar in your backyard. Others found it interesting and it has circulated among several technology blogs.

Here it is on Make Magazine

Here it is on Popular Science

Hope you find this interesting! If you build your own SAR we would like to see it too, post it here on our blog.

Stay tuned for even more interesting stuff coming up at our meeting in July.

Greg,

Chair AP-S Boston.

Cary Rappaport's publications: detecting buried mines, imaging, medical applications of applied EM

Our meeting last week was a record attendance for IEEE AP-S Boston. During which there was much debate and discussion of possible ways to image the location of underground tunnels using UHF SAR. In addition to this, there was much discussion of Cary's previous work in finding buried mines with radar sensing techniques.

I think many of our members would like to read up on Cary's previous work. Here it is, scroll down about half-way to see all publications on these topics.

Looking forward to seeing everyone at our next meeting,

6:00 PM, Wednesday, 14 July

Technology Goes to War

Deborah G. Douglas, Curator of Science and Technology, MIT Museum

Determining tunnel positions under rough surfaces with underground focused synthetic aperture radar

IEEE AP-S Boston Chapter is pleased to present this fascinating talk on determining tunnel positions using underground focused SAR. As you can guess, this technology has many relevant applications.

Feel free to invite your colleagues, we are looking forward to seeing you there;

6:00 PM, Tuesday, 8 June

Determining tunnel positions under rough surfaces with underground focused synthetic aperture radar

Carey Rappaport, Northeastern University, Boston, MA 02115

Underground tunnels present both military and homeland security threats since smugglers use them as transit routes for trafficking weapons, explosives, people, drugs, and other illicit materials. Detecting and imaging the presence of tunnels in any given region of ground is possible because the air that fills them is materially quite different from anything else underground. The Spotlight Synthetic Aperture Radar (SL-SAR) has been used due to its ability to scan large areas of terrain in a short amount of time, which is ideal for tunnel detection. In order to obtain strong and distinct target signals, Underground Focusing, based on ray refraction at the ground surface is being considered. This presents a challenge since the technique requires an estimation of the ground characteristics, and the random roughness of the soil surface tends to distort the reconstructed image of the analyzed geometry.

This presentation explores the impact of the surface roughness in Underground Focusing SAR imaging for tunnel detection applications. The study starts by simulating incident plane waves from 19 angles (-45 to 45 degrees) at 128 different frequencies (55 to 550 MHz) with 2-D Finite Difference Frequency Domain (FDFD) analysis on 2 different types of soil: non-dispersive sandy soil and lossy clay loam soil with 10 cm of randomly distributed roughness. It is demonstrated that a shallow tunnel can be imaged in low moisture, non-conductive sand, but that the more lossy moist clay presents too much surface clutter to distinguish the tunnel.

Carey M. Rappaport (IEEE M, SM 96, F 06) received five degrees from the Massachusetts Institute of Technology: the SB in Mathematics, the SB, SM, and EE in Electrical Engineering in June 1982, and the PhD in Electrical Engineering in June 1987. He is married to Ann W. Morgenthaler, and has two children, Sarah and Brian.

Prof. Rappaport has worked as a teaching and research assistant at MIT from 1981 until 1987, and during the summers at COMSAT Labs in Clarksburg, MD, and The Aerospace Corp. in El Segundo, CA. He joined the faculty at Northeastern University in Boston, MA in 1987. He has been Professor of Electrical and Computer Engineering since July 2000. During fall 1995, he was Visiting Professor of Electrical Engineering at the Electromagnetics Institute of the Technical University of Denmark, Lyngby, as part of the W. Fulbright International Scholar Program. During the second half of 2005, he was a visiting research scientist at the Commonwealth Scientific Industrial and Research Organisation (CSIRO) in Epping Australia. He has consulted for CACI, Alion Science and Technology, Inc., Geo-Centers, Inc., PPG, Inc., and several municipalities on wave propagation and modeling, and microwave heating and safety. He was Principal Investigator of an ARO-sponsored Multidisciplinary University Research Initiative on Humanitarian Demining, Co-Principal Investigator of the NSF-sponsored Engineering Research Center for Subsurface Sensing and Imaging Systems (CenSSIS), and Co-Principal Investigator of the DHS-sponsored Awareness and Localization of Explosive Related Threats (ALERT) Center of Excellence.

Prof. Rappaport has authored over 330 technical journal and conference papers in the areas of microwave antenna design, electromagnetic wave propagation and scattering computation, and bioelectromagnetics, and has received two reflector antenna patents, two biomedical device patents and three subsurface sensing device patents. He was awarded the IEEE Antenna and Propagation Society's H.A. Wheeler Award for best applications paper, as a student in 1986. He is a member of Sigma Xi and Eta Kappa Nu professional honorary societies.

Meeting will be held at MIT Lincoln Laboratory A-Café, 244 Wood Street, Lexington, MA. For directions please see:http://www.ll.mit.edu/about/map.html

For more information, contact Antennas & Propagation chair, Gregory Charvat at Gregory.charvat@ll.mit.edu

Our website is now up

Hi everyone,

Our website is now up, and it is hosted by IEEE APS. If you get a minute please check it out here.

See you at our next meeting!

Greg

IEEE Antennas and Propagation Society Distinguished Lecturers?

Hi everyone,

We have an opportunity to invite an APS distinguished lecturer to speak for our club.

My question for you is; which topic do you find to be the most interesting?

If you get a minute look these over and let me know:
http://www.ieeeaps.org/distlectureres.html

Post your reply on this blog, our google group, or e-mail directly to me.

Thank you for your time,

Gregory L. Charvat

Chair, IEEE AP-S Boston Chapter

Inverse scattering for coherent optical and radar imaging systems

Have you ever wondered what the inside of a tadpole looks like but did not want to dissect or hurt it? T. Ralston has the answer, he will show us a method that allows medical personnel to look under the skin and see at a microscopic resolution, in 3 dimensions, and in some cases in real-time (see video above of a tadpole's heart beating).

This will be a fascinating talk for anyone interested in scattering, optics, synthetic aperture radar, and medicine. Please feel free to invite your friends!

Details:

5:30 PM, Monday, 10 May

Inverse scattering for coherent optical and radar imaging systems

Tyler S. Ralston, Massachusetts Institute of Technology Lincoln Laboratory

This talk will juxtapose an emerging broadband optical imaging technology, interferometric synthetic aperture microscopy (ISAM), with the well-known synthetic aperture radar (SAR), a method for imaging with millimeter electromagnetic waves. ISAM is a new technique for 3-D noninvasive biophotonic imaging. The hardware for ISAM is derived from the widely-used optical coherence tomography (OCT), a low-coherence interferometric (LCI) ranging technique with micron resolution deep (1-2 mm) within biological tissues. Both methods take advantage of the fact that the data are samples of a linear functional of the fields, and that the fields are connected to the object susceptibility function through Maxwell's equations. The susceptibility function, or a filtered version of it, is determined in terms of the known data by solving this system of equations. New advances in algorithms and computing hardware have enabled real-time ISAM – an important step toward enabling widespread clinical use.

Tyler S. Ralston received his Bachelors degree in Electrical and Computer Engineering from the University of Dayton (2000). Prior to earning his Masters and PhD in Electrical and Computer Engineering from the University of Illinois (2006), he worked as an electrical engineer in the medical products industry at Battelle Memorial Institute (1998-2001). After his PhD, he worked as a post doctorate research scientist at the Beckman Institute (2006-2007) developing optical systems and algorithms for biomedical research applications. In 2007, he began working in his current position at the Massachusetts Institute of Technology Lincoln Laboratory developing algorithms for radar and optical systems.

Meeting will be held at MIT Lincoln Laboratory A-Café, 244 Wood Street, Lexington, MA. For directions please see:http://www.ll.mit.edu/about/map.html

For more information, contact Antennas & Propagation chair, Gregory Charvat at Gregory.charvat@ll.mit.edu

Ultrawideband Mini Offset Bicone Antenna, slides from J. Sandora's talk on 4/14/2010

I have posted the slides from John Sandroa's talk on how to design, model, then fabricate and test a UWB Mini-Offset Bicone Antenna, here.

John has received many inquiries about his talk. Feel free to post your comments or questions here on the blog.