Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Patent
1991-11-27
1993-03-02
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
342195, G01S 1390
Patent
active
051913445
ABSTRACT:
In a method for digital generation of SAR images obtained by means of a coherent imaging system a signal compression in the azimuth and/or range direction is carried out with high resolution by means of a subaperture configuration. A stepwise linear approximation of a quadratic phase characteristic is performed with regard to a reference function and frequency overlapping of the subapertures is effected for optimizing the approximation of the phase characteristic. For the formation and synthesis of the subapertures complex multiplications are carried out, the signal of each subaperture thereby being shifted in the frequency. The individual subapertures are integrated twice by means of the moving average method for reducing the side lobes of the low resolution impulse response and after a time shift for equalizing the relative positioning of the subapertures and after the complex multiplications for the frequency shift the results obtained in the individual subapertures are coherently summated.
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Deutsche Forschungsanstalt fur Luft- und Raumfahrt
Sotomayor John B.
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