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A new three-dimensional (3-D) near-field Inverse Synthetic Aperture Radar (ISAR) imaging technique has been developed. A 3-D ISAR image can be obtained by processing coherently the backscattered fields as a function of the frequency and two rotation angles about axes which are mutually orthogonal. Most of the existing ISAR algorithms are based on the Fourier transform and as such can tolerate only small amounts of wavefront curvature. Wavefront curvature must be taken into account when imaging an object in the near-field. Near-field ISAR imaging of large objects using a direct Fourier inversion may result in images which are increasingly unfocused at points which are more distant from the centre of rotation. An algorithm based on an azimuth convolution between a near-field focusing function and the frequency domain backscattered fields is discussed.

Additional information

Authors: FORTUNY J, JRC Ispra (IT)
Bibliographic Reference: Article: IEEE Transactions on Aerospace and Electronics Systems
Record Number: 199810596 / Last updated on: 1998-05-12
Original language: en
Available languages: en
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