Patents by Inventor Pau Prats

Pau Prats 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: 8049657
    Abstract: Sub-aperture processing is carried out. Within each sub-aperture, range compression and a correction for the target range variation are carried out. Baseband azimuth scaling is used for processing the azimuth signal, wherein a long azimuth reference function and thus a wide azimuth dimension are prevented. The scaling range is not constant and depends on the range, which is not equal to the original range vector. It is calculated such that, in combination with a subsequent derotation step, constant azimuth scanning is achieved for all ranges. The selected derotation function, which is applied in the azimuth time domain, makes it possible for all the targets to be in base band, in this way varying the effective chirp rate. Since the phase is purely quadratic because of the azimuth scaling step, it is thus possible to use an optimal filter which takes account of the effective chirp rate. IFFT results in a focused image, and a final phase function in the time domain allows phase maintenance.
    Type: Grant
    Filed: June 26, 2008
    Date of Patent: November 1, 2011
    Assignee: Deutsches Zentrum Fuer Luft - und Raumfahrt E.V.
    Inventors: Pau Prats, Josef Mittermayer, Rolf Scheiber, Alberto Moreira
  • Publication number: 20100207808
    Abstract: Sub-aperture processing is carried out. Within each sub-aperture, range compression and a correction for the target range variation are carried out. Baseband azimuth scaling is used for processing the azimuth signal, wherein a long azimuth reference function and thus a wide azimuth dimension are prevented. The scaling range is not constant and depends on the range, which is not equal to the original range vector. It is calculated such that, in combination with a subsequent derotation step, constant azimuth scanning is achieved for all ranges. The selected derotation function, which is applied in the azimuth time domain, makes it possible for all the targets to be in base band, in this way varying the effective chirp rate. Since the phase is purely quadratic because of the azimuth scaling step, it is thus possible to use an optimal filter which takes account of the effective chirp rate. IFFT results in a focused image, and a final phase function in the time domain allows phase maintenance.
    Type: Application
    Filed: June 26, 2008
    Publication date: August 19, 2010
    Applicant: DEUTSCHES ZENTRUM FÜR LUFT- UND RAUMFAHRT E.V.
    Inventors: Pau Prats, Josef Mittermayer, Rolf Scheiber, Alberto Moreira