Multi-scale adaptive filter for interferometric SAR data

Details Multi-scale adaptive filter for interferometric SAR data Multi-scale adaptive filter for interferometric SAR data

1994-10-14

1996-01-30

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Synthetic aperture radar

342162, 342194, 342195, G01S 1390

Patent

active

054883741

ABSTRACT:
Apparatus including a multi-scale adaptive filter for smoothing interferometric SAR (IFSAR) data in areas of low signal-to-noise ratio (SNR) and/or coherence while preserving resolution in areas of high SNR/coherence. The multi-scale adaptive filter uses simple combinations of multiple linear filters applied to a complex interferogram. The multi-scale adaptive filter is computationally efficient and lends itself to parallel implementation. A pyramid architecture comprising a plurality of cascaded stages is employed which reduces the computational load and memory required for implementation of the processing algorithm. The multi-scale adaptive filter implements a processing algorithm that may be applied to standard IFSAR data. Its input is a complex interferogram (the conjugate product of two complex images) and its output is a filtered interferogram (A) which is passed to an information extraction processor, that extracts a terrain elevation map, for example. The adaptive filter incorporates linear filters at two or more scales (i.e. filter impulse response widths) whose outputs are combined in a data-dependent manner. The combination rules result in an output interferogram (A) that is filtered heavily in areas of low coherence and receives little or no filtering in areas of high coherence. The combination rules use a coherence measure that is a simple nonlinear function of the linear filter outputs themselves.

REFERENCES:
patent: 4999635 (1991-03-01), Niho
patent: 5313210 (1994-05-01), Gail
patent: 5332999 (1994-07-01), Prati et al.
patent: 5334980 (1994-08-01), Decker
patent: 5402131 (1995-05-01), Pierce
patent: 5424743 (1995-06-01), Ghiglia et al.

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