Please join us for the January 10, 2019 meeting of the Potomac Geophysical Society at 7:00 p.m. at the DoubleTree by Hilton McLean Tysons, 1960 Chain Bridge Road, 22102. This location is within one-half mile of the Tysons Corner Metro station, near I-495, and has free parking available. Our private meeting room is located on the second floor of the hotel. The optional dinner cost will be discounted to $30 for members in good standing (have paid dues) and students, and $40 for non-members, and is inclusive of coffee, tax and gratuity. Members and guests may attend the presentation after dinner for no charge; we estimate that the presentation will begin at 8:15 p.m. For attendees who arrive early, social time will be held in O’Malley’s Pub on the first floor of the DoubleTree by Hilton hotel. Drinks may also be purchased in the private meeting room on a cash basis.
If you plan on attending, please RSVP to firstname.lastname@example.org by noon Monday, January 7 We encourage you to spread the word about our meetings to your colleagues and students (a flyer is attached). As always, guests are welcomed. We hope to see you there!
Social Time: 6:00-7:00 p.m. O’Malley’s Pub, first floor DoubleTree by Hilton
Dinner: 7:00-8:15 p.m. Dogwood Room*, second floor DoubleTree by Hilton
Step Frequency Continuous Waveform 3D Ground Penetrating Radar
by Jacopo Sala, 3D-Radar AS
Ground Penetrating Radar (GPR) uses electromagnetic waves to generate an image of the subsurface. GPR finds application in many different fields, from civil engineering to archaeology and even exploration of planetary bodies! Most GPR systems use a short electromagnetic pulse to probe the underground, while others, like 3D‑Radar’s own, are “frequency radars”, mapping the frequency response of the subsurface. 3D‑Radar’s arrays of antennas allow to collect a very dense data cube in a single swath, giving also the possibility to fully customize the scan pattern by pairing any of the transmitting and receiving elements. Needless to say, a hypercube of raw data in the frequency domain allows great flexibility during post-processing, and offers several hours (years?) of pure fun to the signal processing geek.
This talk will go through the basics of GPR, covering both theoretical and practical aspects of this geophysical method, and focusing in particular on 3D‑Radar’s Step-Frequency Continuous Waveform (SFCW) 3D GPR. The goal is to provide a concise overview of the technology, from data collection to post‑processing, analysis and interpretation, and offer some additional thoughts on how both hardware and data could be possibly exploited further.