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Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers (1994)
Pacific Grove, CA, USA
Oct. 31, 1994 to Nov. 2, 1994
ISSN: 1058-6393
ISBN: 0-8186-6405-3
pp: 145-150
S.D. Cabrera , Dept. of Electr. & Comput. Eng., Texas Univ., El Paso, TX, USA
B.C. Flores , Dept. of Electr. & Comput. Eng., Texas Univ., El Paso, TX, USA
E. Rodriguez , Dept. of Electr. & Comput. Eng., Texas Univ., El Paso, TX, USA
G. Thomas , Dept. of Electr. & Comput. Eng., Texas Univ., El Paso, TX, USA
ABSTRACT
The adaptive weighted norm extrapolation (AWNE) procedure of Cabrera and Parks (1991) is generalized to non-uniform one-dimensional (1-D) and two-dimensional (2-D) sampling configurations. This extrapolation procedure which is based on iterative modification of the frequency weighting function in minimum weighted norm extrapolation produces high frequency-domain resolution. The approach presented is derived for totally arbitrary sampling configurations to include those that appear in inverse synthetic aperture radar (ISAR) imaging of a rotating object. The resulting procedure produces estimates of signal samples on rectangular coordinates in the neighborhood of the given samples (interpolation) as well as beyond (extrapolation). When applied to SAR/ISAR imaging, the procedure produces a complex reflectivity image in the slant-range cross-range domain from the samples of the object's Fourier transform, available at non-cartesian coordinate locations. Examples illustrate the performance of this interpolation/extrapolation procedure using samples of l-D and 2-D sums of complex sinusoids to simulate range profiles and images of a few point scatterers.<>
INDEX TERMS
synthetic aperture radar, radar imaging, extrapolation, spectral analysis, estimation theory, image sampling, iterative methods, frequency-domain analysis, image resolution, Fourier transforms
CITATION

S. Cabrera, B. Flores, E. Rodriguez and G. Thomas, "Two-dimensional extrapolation and spectral estimation from arbitrary sampling configurations for SAR/ISAR imaging," Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers(ACSSC), Pacific Grove, CA, USA, 1995, pp. 145-150.
doi:10.1109/ACSSC.1994.471434
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