Patents by Inventor Daniel S. Chew

Daniel S. Chew 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).

  • Grating lobe mitigation in presence of simultaneous receive beams
    Patent number: 9075128
    Abstract: A method that digitally distinguishes mainlobe detections from grating lobe and sidelobe detections without need for added antenna or receiver architecture. The method includes applying receive weights to return radar data for each radar receive element to steer each subarray of a array radar antenna to a direction other than the subarray transmit angle and includes applying a subarray weight to each subarray to generate the array radar antenna receive beam data having magnitude and phase components. The method includes applying predetermined scale factors to the subarray beam data magnitude for each subarray to generate scaled subarray beam data magnitudes. The method includes generating guard beam data for each subarray based on the scaled subarray beam data magnitudes. The method also includes determining if the return radar data corresponds to a mainlobe or a grating lobe or sidelobe based on the receive beam data and the guard beam data.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: July 7, 2015
    Assignee: RAYTHEON COMPANY
    Inventors: Daniel S. Chew, Leo H. Hui
  • GRATING LOBE MITIGATION IN PRESENCE OF SIMULTANEOUS RECEIVE BEAMS
    Publication number: 20130176173
    Abstract: A method that digitally distinguishes mainlobe detections from grating lobe and sidelobe detections without need for added antenna or receiver architecture. The method includes applying receive weights to return radar data for each radar receive element to steer each subarray of a array radar antenna to a direction other than the subarray transmit angle and includes applying a subarray weight to each subarray to generate the array radar antenna receive beam data having magnitude and phase components. The method includes applying predetermined scale factors to the subarray beam data magnitude for each subarray to generate scaled subarray beam data magnitudes. The method includes generating guard beam data for each subarray based on the scaled subarray beam data magnitudes. The method also includes determining if the return radar data corresponds to a mainlobe or a grating lobe or sidelobe based on the receive beam data and the guard beam data.
    Type: Application
    Filed: January 9, 2012
    Publication date: July 11, 2013
    Applicant: Raytheon Company
    Inventors: Daniel S. Chew, Leo H. Hui