The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 25, 2012
Filed:
Dec. 22, 2009
Shuchin Aeron, Brookline, MA (US);
Sandip Bose, Brookline, MA (US);
Henri-pierre Valero, Yokohama, JP;
Venkatesh Saligrama, Newton Center, MA (US);
Shuchin Aeron, Brookline, MA (US);
Sandip Bose, Brookline, MA (US);
Henri-Pierre Valero, Yokohama, JP;
Venkatesh Saligrama, Newton Center, MA (US);
Schlumberger Technology Corporation, Sugar Land, TX (US);
Trustees of Boston University, Boston, MA (US);
Abstract
Slowness dispersion characteristics of multiple possibly interfering signals in broadband acoustic waves as received by an array of two or more sensors are extracted without using a physical model. The problem of dispersion extraction is mapped to the problem of reconstructing signals having a sparse representation in an appropriately chosen over-complete dictionary of basis elements. A sparsity penalized signal reconstruction algorithm is described where the sparsity constraints are implemented by imposing a lnorm type penalty. The candidate modes that are extracted are consolidated by means of a clustering algorithm to extract phase and group slowness estimates at a number of frequencies which are then used to reconstruct the desired dispersion curves. These estimates can be further refined by building time domain propagators when signals are known to be time compact, such as by using the continuous wavelet transform.