Feasibility study of synthetic aperture infrared laser radar techniques for imaging of static and moving objects.

Techniques for two types of 10-mum band synthetic aperture infrared laser radar using a hypothetical reference point target (RPT) are presented. One is for imaging static objects with a single two-dimensional scanning aperture. Through the simple manipulation of a reference wave phase, a desired image can be obtained merely by the two-dimensional Fourier transformation of the correlator output between the intermediate frequency signals of the reference and object waves. The other, with a one-dimensional aperture array, is for moving objects that pass across the array direction without attitude change. We performed imaging by using a two-dimensional RPT correlation method. We demonstrate the capability of these methods for imaging and evaluate the necessary conditions for signal-to-noise ratio and random phase errors in signal reception through numerical simulations in terms of feasibility.

[1]  Dale A. Ausherman,et al.  Developments in Radar Imaging , 1984, IEEE Transactions on Aerospace and Electronic Systems.

[2]  C. Aleksoff,et al.  Interferometric two-dimensional imaging of rotating objects. , 1977, Optics letters.

[3]  Jack Walker,et al.  Range-Doppler Imaging of Rotating Objects , 1980, IEEE Transactions on Aerospace and Electronic Systems.

[4]  W. Brown,et al.  Range-Doppler Imaging with Motion through Resolution Cells , 1969, IEEE Transactions on Aerospace and Electronic Systems.

[5]  A. D. Cenzo.  A new look at nonseparable synthetic aperture radar processing , 1988 .

[6]  G. Swenson,et al.  The interferometer in radio astronomy , 1968 .

[7]  J. Marron,et al.  Three-dimensional lensless imaging using laser frequency diversity. , 1992, Applied optics.

[8]  G.Y. Delisle,et al.  Precision tracking algorithms for ISAR imaging , 1996, IEEE Transactions on Aerospace and Electronic Systems.

[9]  James R. Fienup,et al.  Gradient-search phase-retrieval algorithm for inverse synthetic-aperture radar , 1994 .

[10]  Carl C. Aleksoff,et al.  Synthetic Aperture Imaging With A Pulsed Co2 Tea Laser , 1987, Other Conferences.

[11]  C. Wiley.  Synthetic Aperture Radars , 1985, IEEE Transactions on Aerospace and Electronic Systems.

[12]  W. Brown.  Synthetic Aperture Radar , 1967, IEEE Transactions on Aerospace and Electronic Systems.

[13]  S. Clark,et al.  Coherent array optical imaging. , 1991, Applied optics.

[14]  T.G. Moore,et al.  A new algorithm for the formation of ISAR images , 1996, IEEE Transactions on Aerospace and Electronic Systems.

[15]  Giorgio Franceschetti,et al.  A SAR processor based on two-dimensional FFT codes , 1990 .

[16]  David G. Voelz,et al.  Nonconventional Laser Imaging Using Sampled-Aperture Receivers , 1992 .