Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Patent
1985-06-17
1988-10-25
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
342196, G01S 1389
Patent
active
047807180
ABSTRACT:
A technique is disclosed for encoding SAR image data to achieve data compression. In the image encoding stage, the SAR image is transformed into a list of high reflectivity radar discretes and a small array of frequency filters. In the target list, the location data and intensity levels above the local average background clutter are tabulated for a predetermined number of the highest intensity radar discretes. The array of frequency filters is divided into three zones; the inner, middle, and higher frequency zones relative to the d.c. filter. Only the inner and middle zones of filters are retained and the outer filters are discarded, thus acheiving the desired data reduction. The inner zone filters are quantized to a higher level of precision than the middle zone of filters. The saturation levels of the filters are determined adaptively. In the decoding stage, the original SAR image is reconstructed from the radar discrete list and the small array of frequency filters.
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Hamed Amor: "Quellencodierung der Feinstrukturkomponenten Hochaufgeloster Biler:; Jan. 1983 (Berlin, DE); pp. 15-20; Fernseh-und Kino-Technik, vol. 37, No. 1.
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Hudson Ralph E.
Niho Yoji G.
Alkov Leonard A.
Blum Theodore M.
Gregory Bernarr Earl
Hughes Aircraft Company
Karambelas A. W.
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