Method of correcting range migration in image generation in...

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G01S 7/40 (2006.01) G01S 7/295 (2006.01) G01S 13/90 (2006.01)

Patent

CA 2073300

In a method for correcting range migration in image generation in synthetic aperture radar (SAR) to eliminate the entire range migration or the residual range migration left by a conventional focussing method, prior to the range compression the data are transformed to the range-Doppler domain and there multiplied by a specific two-dimensional phase function; after an additional range Fourier transformatioin the range compression is then carried out with a specifically modified range transfer function and thereafter a range inverse Fourier transformation performed. Furthermore, a corresponding residual phase error is corrected. In addition, the data can if necessary be segmented in range or a range precompression performed. With the method according to the invention the range migration is completely eliminated without having to perform an explicit interpolation. Furthermore with reduced processing expenditure improved image quality is obtained and moreover all known SAR focussing methods can be equipped with the method according to the invention.

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