Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Patent
1992-07-07
1993-08-17
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
342196, G01S 1390
Patent
active
052373290
ABSTRACT:
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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Bamler Richard
Runge Hartmut
Deutsche Forschungsanstalt fur Luft - und Raumfahrt e.V.
Sotomayor John B.
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