Joshua Mangelson

News

Updates

1/2019 I gave a seminar at Stevens Institute of technology.
9/2018 Our paper won Best Student Poster at IEEE OCEANS 2018.
6/2018 I'm on the program committee and local arrangements chair for RSS Pioneers 2019.
5/2018 Our paper won Best Multi-Robot Paper at IEEE ICRA 2018.

Upcoming Travel

1/28/2019 - 1/31 Sandestin, Florida
ONR UMST Program Review
2/5/2019 Provo, Utah
Seminar at Brigham Young University
2/11/2019 Worcester, Massachusetts
Seminar at Worcester Polytechnic Institute
2/14/2019 Corvallis, Oregon
Seminar at Oregon State University

Publications

Guaranteed Globally Optimal Planar Pose Graph and Landmark SLAM via Sparse-Bounded Sums-of-Squares Programming
Joshua G. Mangelson, Jinsun Liu, Ryan M. Eustice, Ram Vasudevan
In Proceedings of the IEEE International Conference on Robotics and Automation (ICRA 2019, Montreal, Canada) [arxiv]

Communication Constrained Trajectory Alignment for Multi-Agent Inspection via Linear Programming
Joshua G. Mangelson, Ram Vasudevan, and Ryan M. Eustice
In Proceedings of the IEEE OES/MTS OCEANS Conference and Exhibition (OCEANS 2018, Charleston, South Carolina) [pdf] [BibTeX] [poster] [code]
1st Place in IEEE OES/MTS OCEANS Student Poster Competition!

Pairwise Consistent Measurement Set Maximization for Robust Multi-robot Map Merging
Joshua G. Mangelson, Derrick Dominic, Ryan M. Eustice, and Ram Vasudevan
In Proceedings of the IEEE International Conference on Robotics and Automation (ICRA 2018, Brisbane, Australia) [pdf] [BibTeX] [code]
ICRA Best Paper on Multi-Robot Systems!

Legged Robot State-Estimation Through Combined Forward Kinematic and Preintegrated Contact Factors
Ross Hartley, Joshua G. Mangelson, Lu Gan, Maani Ghaffari Jadidi, Jeffrey M. Walls, Ryan M. Eustice, and Jessy W. Grizzle
In Proceedings of the IEEE International Conference on Robotics and Automation (ICRA 2018, Brisbane, Australia) [pdf] [BibTeX]

Robust Visual Fiducials For Skin-to-Skin Relative Ship Pose Estimation
Joshua G. Mangelson, Ryan W. Wolcott, Paul Ozog, and Ryan M. Eustice
In Proceedings of the IEEE OES/MTS OCEANS Conference and Exhibition (OCEANS 2016, Monterey, California) [pdf] [BibTeX] [poster]

Research

Current Projects

Autonomous Ship Hull Inspection

I am currently working on autonomous ship hull inspection as part of a project funded by the Office of Naval Research. Using the Hovering Autonomous Underwater Vehicle or (HAUV) designed by BlueFin Robotics, I am developing perception, estimation, and planning algorithms that enable the use of multiple HAUVs to cooperatively map the bottom of a ship hull in real-time.

Perception For Bipedal Locomotion

I am also currently working on a project in collaboration with Jessy Grizzle and his bipedal locomotion lab. They develop state-of-the-art control algorithms to enable robotic vehicles to robustly walk and run. We are adding perceptual sensors to the Agility Robotics bipedal robot, CASSIE, so we can enable it to run over rough terrain and through complex outdoor environments. This project is funded by the Toyota Research Institute.

Choosing Consistent Measurements for Robust Multi-Robot Map Merging

The merging of robotic maps when performing Multi-Robot Simultaneous Localization and Mapping (SLAM) can be complicated by outlier measurements suggesting an incorrect alignment between robot trajectories and the absence of a prior on relative pose. We've developed a method that uses efficient maximum clique algorithms to select a set of pairwise consistent measurements that can then be used to accurately merge maps. Because our method searches for a set of consistent measurements, it does not require a prior, outperforms existing "Robust SLAM" methods, and can handle situations with large percentages of outliers. [more]

Contact/Forward Kinematic
Legged Robot Odometry

Accurately estimating the motion of a robotic agent is an essential prerequisite for autonomous interactions in real-world environments. By taking into account the fact that legged robots come into rigid contact with the environment, we've developed a method that fuses forward kinematic (FK) information with inertial measurements (IMU) via sparse pose graph optimization. [more]

Convex
Simultaneous Localization and Mapping

The simultaneous localization and mapping (SLAM) refers to the simultaneous estimation of a robot's trajectory and a map of its surroundings. This problem has generally been assumed to be non-convex meaning that estimation of its solution can be heavily dependent on initialization of the algorithm. This results in mapping and navigation algorithms that can fail suddenly if the estimator gets caught in a local minimum. We were able to show that the planar Pose Graph SLAM and Landmark SLAM problems can be exactly formulated as convex optimization problems. We then showed that via the use of sum-of-squares (SOS) optimization, we can guarantee the globally optimal solution to these problems without any initialization. We are currently interested in developing methods that enable this algorithm to scale to larger datasets. [more]

Past Projects

Relative Ship Pose Estimation

As part of the Environmental and Ship Motion Forecasting (ESMF) project funded by the Office of Naval Research, I developed a system to estimate the relative pose of two ships moored skin-to-skin at sea. Using a set of cameras on one ship and a modified version of AprilTags on the other, we estimated the relative pose of the USNS John Glenn and the USNS Bob Hope during field trials off the coast of Oceanside, California. [more]

Robust Fiducials for Estimating Pose in Outdoor Lighting

Visual fiducials are often used in robotics and artificial reality to estimate the position and orientation of objects with respect to a camera. By detecting known points on the tag in the image frame, we can estimate the most likely pose of the camera given the detected points. However, many of the tags were designed indoors and fail in outdoor lighting and at large distances because lighting affects the estimated location of the tag points. We developed an extension that can be applied to a variety of visual fiducials that overcomes some of these biasing problems. [more]

Teaching

Digital Systems Teaching Lab Manager

In the Electrical and Computer Engineering Department at Brigham Young University, I managed the digital teaching lab responsible for the laboratory portion of two courses: Fundamentals of Digital Systems (EcEn 220) and Digital System Design (EcEn 320). Course material covered included digital logic design, basic processor architecture, VHDL/verilog coding, HDL simulation and testing, synchronous and asynchronous circuits, and computer arithmetic.

My responsabilities included teaching weekly laboratory lectures on VHDL/Verilog, managing/training a team of teaching assistants, laboratory assignment development, answering student questions, all grading for the courses (except exams), and substituting in lecture.

Mobile Robotics Course Assistant and Grader