Coordinate Transformation by Nearest Neighbor Interpolation for ISAR Fixed Scene Imaging

Koichi SASAKI  Masaru SHIMIZU  Yasuo WATANABE  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E84-C    No.12    pp.1905-1909
Publication Date: 2001/12/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on New Technologies in Signal Processing for Electromagnetic-wave Sensing and Imaging)
Category: 
Keyword: 
millimeter/submillimeter wave,  ISAR,  delaunay triangulation,  nearest neighbor interpolation,  fixed scene imaging,  

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Summary: 
The reflection signal in the inverse synthetic aperture radar is measured in the polar coordinate defined by the object rotation angle and the frequency. The reconstruction of fixed scene images requires the coordinate transformation of the polar format data into the rectangular spatial frequency domain, which is then processed by the inverse Fourier transform. In this paper a fast and flexible method of coordinate transformation based on the nearest neighbor interpolation utilizing the Delauney triangulation is at first presented. Then, the induced errors in the transformed rectangular spatial frequency data and the resultant fixed scene images are investigated by simulation under the uniform plane wave transmit-receive mode over the swept frequency 120-160 GHz, and the results which demonstrate the validity of the current coordinate transformation are presented.