no code implementations • 1 Apr 2024 • Lisong C. Sun, Neel P. Bhatt, Jonathan C. Liu, Zhiwen Fan, Zhangyang Wang, Todd E. Humphreys, Ufuk Topcu
We show for the first time that using 3D Gaussians for map representation with unposed camera images and inertial measurements can enable accurate SLAM.
no code implementations • 19 Mar 2024 • Andrew M. Graff, Todd E. Humphreys
This paper is the first to solve for these ZZB-optimal allocations in the context of OFDM signals, under integer resource allocation constraints, and under both coherent and noncoherent reception.
no code implementations • 6 Sep 2023 • Andrew Graff, Todd E. Humphreys
Analysis based on the derived bounds demonstrates how Pareto-optimal design choices can be made to optimize the communication throughput, probability of outage, and ranging variance.
no code implementations • 20 Jul 2023 • Andrew M. Graff, Todd E. Humphreys
This paper proposes a method of passively estimating the parameters of frequency-modulated-continuous-wave (FMCW) radar signals with a wide range of structural parameter values and analyzes how a malicious actor could employ such estimates to track and spoof a target radar.
no code implementations • 20 Oct 2022 • Todd E. Humphreys, Peter A. Iannucci, Zacharias Komodromos, Andrew M. Graff
We develop a technique for blind signal identification of the Starlink downlink signal in the 10. 7 to 12. 7 GHz band and present a detailed picture of the signal's structure.
no code implementations • 28 Feb 2022 • Zachary Clements, James E. Yoder, Todd E. Humphreys
This paper's spoofing detection technique capitalizes on the carrier-phase fixed-ambiguity residual cost produced by a well-calibrated carrier-phase-differential GNSS (CDGNSS) estimator that is tightly coupled with a low-cost IMU.
no code implementations • 27 Jan 2022 • James E. Yoder, Todd E. Humphreys
A vehicular pose estimation technique is presented that tightly couples multi-antenna carrier-phase differential GNSS (CDGNSS) with a low-cost MEMS inertial sensor and vehicle dynamics constraints.
no code implementations • 25 Sep 2020 • Peter A. Iannucci, Todd E. Humphreys
Non-cooperative use of LEO signals for PNT is an option, but cooperation with the constellation operator ("fusion" with its communications mission) eases the burden of tracking a dense, low-altitude constellation from the ground and enables a receiver to produce single-epoch stand-alone PNT solutions.
no code implementations • 9 Sep 2020 • Lakshay Narula, Peter A. Iannucci, Todd E. Humphreys
Deployment of automated ground vehicles beyond the confines of sunny and dry climes will require sub-lane-level positioning techniques based on radio waves rather than near-visible-light radiation.
no code implementations • 9 Sep 2020 • Matthew J. Murrian, Lakshay Narula, Peter A. Iannucci, Scott Budzien, Brady W. O'Hanlon, Mark L. Psiaki, Todd E. Humphreys
Observation of terrestrial GNSS interference (jamming and spoofing) from low-earth orbit (LEO) is a uniquely effective technique for characterizing the scope, strength, and structure of interference and for estimating transmitter locations.
no code implementations • 2 May 2020 • Lakshay Narula, Peter A. Iannucci, Todd E. Humphreys
Deployment of automated ground vehicles (AGVs) beyond the confines of sunny and dry climes will require sub-lane-level positioning techniques based on radio waves rather than near-visible-light radiation.
no code implementations • 23 Jun 2019 • Todd E. Humphreys, Matthew J. Murrian, Lakshay Narula
This paper presents the most thorough study to date of vehicular carrier-phase differential GNSS (CDGNSS) positioning performance in a deep urban setting unaided by complementary sensors.