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Geodesy via GPS and INSAR integration

  • US 7,768,441 B2
  • Filed: 06/09/2009
  • Issued: 08/03/2010
  • Est. Priority Date: 02/06/2008
  • Status: Active Grant
First Claim
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1. A method for refining surface deformation measurements, comprising:

  • providing InSAR data, wherein the InSAR data is line of sight InSAR data;

    providing Global Positioning System (GPS) data;

    filtering the InSAR data using a two dimensional convolution filter;

    assembling the GPS data over a time span that matches the InSAR data;

    resolving the GPS data into a line of sight direction represented by the InSAR data;

    determining a correction, wherein determining the correction includes;

    matching the InSAR data with the GPS data at one or more correction points along the line of sight direction; and

    fitting a plane to the InSAR data, wherein the plane makes an average line of sight deformation around an edge of a scene represented by the InSAR data equal to zero;

    generating a corrected line of sight image, wherein the generating includes applying the correction to the InSAR data using a minimally curved surface between a plurality of known points;

    generating a plurality of XY motion maps, wherein generating includes;

    correlating a plurality of XY motions from a plurality of GPS sites with a gradient of the corrected line of site image;

    determining a correlation coefficient, wherein the correlation coefficient is a percentage that represents how dependent calculation of the XY motion will be upon the gradient of the corrected line of site image; and

    building a plane of XY motion using at least one of the plurality of XY motions;

    using the correlation coefficient to produce a linear combination of the plurality of XY motion maps; and

    using the linear combination to convert the InSAR data to vertical motion.

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