Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Reexamination Certificate
2008-06-26
2011-11-01
Tarcza, Thomas (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
C342S02500R, C342S02500R, C342S02500R, C342S02500R, C342S02500R, C342S02500R
Reexamination Certificate
active
08049657
ABSTRACT:
Sub-aperture processing is carried out. Within each sub-aperture, range compression and a correction for the target range variation are carried out. Baseband azimuth scaling is used for processing the azimuth signal, wherein a long azimuth reference function and thus a wide azimuth dimension are prevented. The scaling range is not constant and depends on the range, which is not equal to the original range vector. It is calculated such that, in combination with a subsequent derotation step, constant azimuth scanning is achieved for all ranges. The selected derotation function, which is applied in the azimuth time domain, makes it possible for all the targets to be in base band, in this way varying the effective chirp rate. Since the phase is purely quadratic because of the azimuth scaling step, it is thus possible to use an optimal filter which takes account of the effective chirp rate. IFFT results in a focused image, and a final phase function in the time domain allows phase maintenance. Application for SAR, SONAR and seismic raw data processing in the TOPS mode, as well as other modes which make use of the antenna polar diagram being scanned in the azimuth and/or elevation direction.
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Mittermayer Josef
Moreira Alberto
Prats Pau
Scheiber Rolf
Bythrow Peter
Clements Gregory N.
Clements Bernard PLLC
Deutsches Zentrum Fuer Luft - und Raumfahrt E.V.
Tarcza Thomas
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