Abstract: In a SAR system a method is provided for compensating for antenna residual motion relative to a motion sensor, wherein such residual motion causes phase corruption in a radar image produced by the SAR system. Residual motion compensation is provided by first correlating a received radar signal to a range line having a plurality of azimuth positions. Such signal is transformed into a frequency spectrum indicating the reflectivity of point reflectors at the various azimuth positions. Then, the range line is sampled for symmetric sets of sequential point reflectors positioned along the range line at a consecutive distance from each other corresponding to a specified frequency associated to a mode of residual vibration of the antenna. The amplitude and phase angle of said mode of the antenna residual motion may be obtained from such symmetric sets.

Abstract: In a SAR system (10) a method is provided for compensating for antenna AN residual motion relative to a motion sensor INS, wherein such residual motion causes phase corruption in a radar image produced by the SAR system. Residual motion compensation is provided by first correlating a received radar signal to a range line having a plurality of azimuth positions. Such signal is transformed into a frequency spectrum indicating the reflectivity of point reflectors at the various azimuth positions. Then, the range line is sampled for symmetric triplets of three sequential point reflectors positioned along the range line at a distance from each other corresponding to a specified frequency associated to a mode of residual vibration of the antenna. The amplitude and phase angle of said mode of the antenna residual motion may be obtained from such symmetric triplet(s).

Abstract: It has been found possible to ferment the pentose D-xylose directly to ethanol with the selected yeast Pachysolen tannophilus. At least an initial aerobic stage is desirable. Improved yields have been obtained when the yeast cells are recycled continually at high cell densities. Fermentation of D-galactose and other hexoses along with D-xylose has been found possible with selected strains or mutants.