Title:
AVERAGING-AREA-CONSTRAINED ADAPTIVE INTERFEROMETRIC FILTER THAT OPTIMIZES COMBINED COHERENT AND NONCOHERENT AVERAGING
Document Type and Number:
WIPO Patent Application WO2000005598
Kind Code:
A3
Abstract:
A family of multiple scale adaptive filters (20) and filtering methods (20) that automatically adapt their impulse response width to local data characteristics, optimizing the accuracy, yield, and/or detail of interferometric measurements. A prefilter (10) with fixed impulse response width is applied to a complex interferogram. The phase of the prefiltered complex interferogram is unwrapped (25). Then, a weighted combination of the phase-unwrapped, fixed-filtered interferograms is computed (30) using a data-dependent criterion function. The resulting weighting function at each resolution element is typically a nonlinear function of interferogram magnitude and coherence for each fixed filter ouput at that resolution element.
Inventors:
FRANKOT ROBERT T
Application Number:
PCT/US1999/014496
Publication Date:
April 27, 2000
Filing Date:
June 25, 1999
Export Citation:
Assignee:
RAYTHEON CO (US)
International Classes:
G01S7/295; G01S13/90; H03H21/00; (IPC1-7): G01S13/90
Foreign References:
US5835055A | 1998-11-10 | |||
US5488374A | 1996-01-30 | |||
US5726656A | 1998-03-10 | |||
US5659318A | 1997-08-19 |
Other References:
FRANKOT R T: "Interferometric SAR adaptive filtering method for improved yield and detail", IGARSS '98. SENSING AND MANAGING THE ENVIRONMENT. 1998 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING. SYMPOSIUM PROCEEDINGS. (CAT. NO.98CH36174), IGARSS '98. SENSING AND MANAGING THE ENVIRONMENT. 1998 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSI, 1998, New York, NY, USA, IEEE, USA, pages 74 - 76 vol.1, XP000884277, ISBN: 0-7803-4403-0
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