Patents by Inventor Aaron D. Kahn

Aaron D. Kahn has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11634229
    Abstract: Disclosed herein is a system comprising: a hydrogen fuel cell; a fuel storage tank; a regulator coupled to the storage tank and the fuel cell; an electronic auto pilot; a rechargeable battery; a power electronics module for delivering power from the fuel cell to the autopilot and the battery; and a heat exchanger coupled to the fuel cell. The fuel cell is characterized by: a minimum continuous power output of no more than 25 W; a maximum continuous power output of no less than 5000 W; a specific power of at least 200 W/kg based on the mass of the fuel cell and any control electronics, cooling components, air delivery components, and water management components; an ability to operate at least 2 psig of hydrogen at an inlet; and an ability to operate at temperatures up to 90° C.
    Type: Grant
    Filed: April 5, 2011
    Date of Patent: April 25, 2023
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Karen Swider Lyons, Richard J Foch, Gregory Page, Michael Schuette, Aaron D. Kahn, Richard Stroman
  • Patent number: 8560234
    Abstract: Embodiments include systems and methods of navigation. In on embodiment, a plurality of position and motion states of a vehicle are estimated. The states may be estimated based on information received from a satellite receiver and an inertial measurement sensor. Estimating the states comprises performing one or more of a plurality of update steps at the rate that information is received from the satellite receiver. The states are estimated at a rate greater than the rate at which the update steps are performed. In one embodiment, the states are estimated using a stepped extended Kalman filter.
    Type: Grant
    Filed: April 30, 2009
    Date of Patent: October 15, 2013
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventor: Aaron D. Kahn
  • Patent number: 8027741
    Abstract: Embodiments include systems and methods of estimating at least one state of a modeled dynamic system. In particular, in one embodiment, an observer such as an extended Kalman filter is used to estimate the state of a modeled dynamic system. A covariance matrix associated with state variables of the observer is periodically checked for compliance with a specified condition, e.g., positive definiteness. If the matrix deviates from the specified condition, the matrix is set to a specified value.
    Type: Grant
    Filed: April 30, 2009
    Date of Patent: September 27, 2011
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Aaron D. Kahn
  • Publication number: 20110202204
    Abstract: Embodiments include systems and methods of navigation. In on embodiment, a plurality of position and motion states of a vehicle are estimated. The states may be estimated based on information received from a satellite receiver and an inertial measurement sensor. Estimating the states comprises performing one or more of a plurality of update steps at the rate that information is received from the satellite receiver. The states are estimated at a rate greater than the rate at which the update steps are performed. In one embodiment, the states are estimated using a stepped extended Kalman filter.
    Type: Application
    Filed: April 30, 2009
    Publication date: August 18, 2011
    Applicant: The Government of the US, as represented by the Secretary of the Navy
    Inventor: Aaron D. Kahn
  • Publication number: 20090299494
    Abstract: Embodiments include systems and methods of estimating at least one state of a modeled dynamic system. In particular, in one embodiment, an observer such as an extended Kalman filter is used to estimate the state of a modeled dynamic system. A covariance matrix associated with state variables of the observer is periodically checked for compliance with a specified condition, e.g., positive definiteness. If the matrix deviates from the specified condition, the matrix is set to a specified value.
    Type: Application
    Filed: April 30, 2009
    Publication date: December 3, 2009
    Inventor: Aaron D. Kahn
  • Publication number: 20080125880
    Abstract: Apparatus includes a reference model unit operable to generating a reference model state signal and a reference model state acceleration signal, the reference model state signal being based, at least in part, on a command control signal. The apparatus includes a reference model limiter including a minimum reference model acceleration value and a maximum reference model acceleration value, and bounding the reference model state acceleration signal be the minimum reference model acceleration value and the maximum reference model acceleration value. Optionally, the apparatus further includes a pseudo-control hedge unit including the reference model limiter and outputting a hedge signal to the reference model unit.
    Type: Application
    Filed: September 25, 2006
    Publication date: May 29, 2008
    Inventor: Aaron D. Kahn