Title:
AVERAGING-AREA-CONSTRAINED ADAPTIVE INTERFEROMETRIC FILTER THAT OPTIMIZES COMBINED COHERENT AND NONCOHERENT AVERAGING
Document Type and Number:
WIPO Patent Application WO2000005598
Kind Code:
A9
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:
October 12, 2000
Filing Date:
June 25, 1999
Export Citation:
Assignee:
RAYTHEON CO (US)
International Classes:
G01S7/295; G01S13/90; H03H21/00; (IPC1-7): G01S13/90
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