Dr. Humphreys Gives Invited Enrichment Lecture at MIT, December 2011

Boston, MA — MIT Professor Dr. Kerri Cahoy, an expert in radio occultation, invited Dr. Todd Humphreys to present on development of the FOTON GPS radio occultation receiver. The presentation was an Invited Enrichment Lecture for her graduate-level Satellite Engineering class and other students and faculty of the MIT AeroAstro department.

Coincident with Dr. Humphreys’s visit, students Ingrid Beerer, Clayton Crail, Jason Herrera, Robert Legge, Whitney Lohmeyer, and Annie Marinan from Dr. Cahoy’s Satellite Engineering course presented the final report of their semester-long feasibility study for the GeoScan Project. The students gave an excellent overview of all the sensors that they hope to pack into the hosted payload bay of the 66 IridiumNext satellites, which will begin to be launched in 2015. A GPS-based occultation sensor is one of the primary system sensor instruments proposed for GeoScan. Lars Dyrud, who has been the primary organizer of GeoScan project, was in attendance. Program directors from NSF attended the students’ presentation virtually.

Dr. Humphreys Chairs Panel at ION GNSS on Improving the Security of GNSS Receivers, September 2011

Portland, OR — Dr. Todd Humphreys chaired an ION GNSS 2011 panel session on “Improving Security of GNSS Receivers.” Dr. Humphreys began the panel with introductory remarks [pptx] noting the increasing trend of spoofing research over the past few years and also presented on practical cryptographic civil GPS signal authentication [pptx]. The panel consisted of five members from industry and academia:

RNL Co-Authors support Four ION GNSS Papers, September 2011

Austin, TX — Outside of the four papers contributed solely by RNL to ION GNSS, RNL members were co-authors on four other papers:

RNL Navigates to ION GNSS, September 2011

Portland, OR — Six members of RNL attended ION GNSS 2011 in Portland, Oregon to present research. Four papers were presented:

The last paper, which Kyle Wesson presented, won the best presentation award in Session E4: Next Generation GNSS Integrity 1.

At right: Members of RNL are about to enjoy a sushi dinner following the conference. Left to right: Zak Kassas, Daniel Shepard, Todd Humphreys, Jahshan Bhatti, Kyle Wesson, Ken Pesyna, and Ryan Mitch (Cornell). 

AE: Todd Humphreys’s Research Team Forges Ahead with Opportunities in Radionavigation, August 2011

Whether it’s investigating ways to preserve the security of GPS signals or developing new types of receivers, the field of radionavigation is ripe with possibility—and Dr. Todd Humphreys does not hesitate for a moment in defining how his research team fits into the mix. “What’s the next big thing in GPS?” he asks. “That’s what we’re trying to pursue. In fact, that’s what we’re trying to create.”

Continue reading the Aerospace Engineering Feature.

Dr. Humphreys Briefs USPTO, April 2011

Austin, TX — Dr. Todd Humphreys briefed the United States Patent and Trademark Office via webcast on the state of the art and future trends in radionavigation on Thursday, 14 April 2011. Examiners were present from the main USPTO site as well as satellite locations. Dr. Humphreys talked about:

  • Overview of Radionavigation/GPS
  • Advances in Weak-Signal GNSS Tracking and Indoor Navigation + Network-aided Navigation
  • Vector Tracking for Improved Navigation Accuracy and Robustness
  • Multipath Mitigation

You can download and view the presentation here [pptx].

You can read more about the presentation here.

Dr. Mark Psiaki visits RNL, april 2011

Austin, TX — Dr. Mark Psiaki visited RNL on 31 March and 1 April and gave two presentations:

  1. Nonlinear Model-Based Estimation Algorithms: Tutorial and Recent Developments [ppt] (BSEKF journal paper) at the Aerospace Department seminar series
  2. Civilian GPS Spoofing Detection based on Dual-Receiver Correlation of Military Signals [pptx] at the WNCG seminar series

UPDATE: Dr. Psiaki has written a paper on the Blind Tricyclist non-linear estimation problem available here [pdf]. Simulation functions and data are also available online.

RNL Briefs DHS and DoD Representatives on GPS Security and Integrity, March 2011

Austin, TX — Members of the Radionavigation Laboratory briefed visitors from the DHSUSCGNSWC, JNWC, and USSTRATCOM on several aspects of GPS security and integrity including: effects of GPS spoofing on power grid monitoringanti-spoofing techniques for civil GPS, and GPS interference detection and localization techniques.

Meeting Agenda and Participants