G - Physics – 01 – S
Patent
G - Physics
01
S
343/54
G01S 13/90 (2006.01) G09B 9/54 (2006.01)
Patent
CA 1203871
ABSTRACT There is described a synthetic aperture radar (SAR) image processing system of the type in which an image is reproduced from a received SAR data through range compression, range curvature compensation and azimuth compres- sion using a range reference function, a range curvature compensation function and an azimuth reference function, respectively. In the new system described the azimuthal-compressed data is divided into a plurality of look components. The correlation values between two look image signals selected from among the look components are developed. Then, the Doppler frequency variation rate Fd is determined based on a relative shift amount (i.e., image shift) giving correlation value. The relative shift amount represents the shift amount between the two look images to be correlated, The range curvature compensation signal and the reference function signal are determined based on Fd developed from the shift amount giving maximum correlation value, thereby, permitting the optimum focusing at all times. Furthermore, initial values for those range curvature compensation signal and azimuth reference function sig- nal are set in such a manner that an intensity value I of the azimuth-compres- sed data is computed for each value of Fd varying in a predetermined range and then the initial values are determined based on the Doppler frequency varia- tion rate giving maximum I. This permits a converging speed higher and the significant reduction in an amount of arithmetic operations and rapid acquisition of the reproduced images.
418702
Nippon Electric Co. Ltd.
Smart & Biggar
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