Patents by Inventor Arnold D. Seifer

Arnold D. Seifer 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).

  • Method and apparatus for passive geolocation using synthetic-aperture processing
    Patent number: 8179317
    Abstract: Using in-phase and quadrature components of a received signal, spatial and temporal information is utilized to generate a maximum likelihood coefficient from the measured data to geolocate an emitter of unknown frequency. In one embodiment an iso-Doppler contour is generated having regions of high correlation to estimate location in which the maximum likelihood calculation uses two factors, one derived from a single aperture and one derived from bearing estimates, with the region of highest correlation corresponding to emitter location. Hypothesized in-phase and quadrature signals corresponding to an emitter location describe what the signals received at the aperture should be if the emitter is of a predetermined frequency and at a predetermined location, with these estimates used in the maximum likelihood algorithm.
    Type: Grant
    Filed: September 10, 2009
    Date of Patent: May 15, 2012
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Arnold D. Seifer, Donald B. Spencer
  • Method and apparatus for passive geolocation using synthetic-aperture processing
    Publication number: 20110057839
    Abstract: Using in-phase and quadrature components of a received signal, spatial and temporal information is utilized to generate a maximum likelihood coefficient from the measured data to geolocate an emitter of unknown frequency. In one embodiment an iso-Doppler contour is generated having regions of high correlation to estimate location in which the maximum likelihood calculation uses two factors, one derived from a single aperture and one derived from bearing estimates, with the region of highest correlation corresponding to emitter location. Hypothesized in-phase and quadrature signals corresponding to an emitter location describe what the signals received at the aperture should be if the emitter is of a predetermined frequency and at a predetermined location, with these estimates used in the maximum likelihood algorithm.
    Type: Application
    Filed: September 10, 2009
    Publication date: March 10, 2011
    Inventors: Arnold D. Seifer, Donald B. Spencer