Averaging-area-constrained adaptive interferometric filter that optimizes combined coherent and noncoherent averaging
US6097328A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 2, 1998 |
| Grant date | Aug 1, 2000 |
| Priority date | — |
| Expiry date | Jul 2, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H21/0012
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A family of multiple scale adaptive filters and filtering methods that automatically adapt their impulse response width to local data characteristics, optimizing the accuracy, yield, and/or detail of interferometric measurements. A prefilter with fixed impulse response width is applied to a complex interferogram. The phase of the prefiltered complex interferogram is unwrapped. Then, a weighted combination of the phase-unwrapped, fixed-filtered interferograms is computed 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 output at that resolution element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.