Abstract

The original formulation of spatially variant apodization for complex synthetic aperture radar imagery concentrated on integer-oversampled data. Noninteger-oversampled data presented previously [IEEE Trans. Aerosp. Electron. Syst. 31, 267 (1995)] suggested use of different weightings in the algorithm. An alternative noninteger-oversampled approach that employs the same apodization concept but uses local spatial interpolation is presented. With this approach the combined image formation, apodization, and detection of 1.3×-versus-2.0× oversampled data can be performed in half the time without loss of image quality.

© 2000 Optical Society of America

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References

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  1. H. C. Stankwitz, R. J. Dallaire, J. R. Fienup, “Nonlinear apodization for sidelobe control in SAR imagery,” IEEE Trans. Aerosp. Electron. Syst. 31, 267–278 (1995).
    [CrossRef]
  2. C. V. Jakowatz, D. E. Wahl, P. H. Eichel, D. C. Ghiglia, P. A. Thompson, Spotlight-Mode Synthetic Aperture Radar: A Signal Processing Approach (Kluwer, Boston, 1996).
    [CrossRef]
  3. A. V. Oppenheim, R. W. Schafer, Digital Signal Processing (Prentice-Hall, New Jersey, 1975).

1995 (1)

H. C. Stankwitz, R. J. Dallaire, J. R. Fienup, “Nonlinear apodization for sidelobe control in SAR imagery,” IEEE Trans. Aerosp. Electron. Syst. 31, 267–278 (1995).
[CrossRef]

Dallaire, R. J.

H. C. Stankwitz, R. J. Dallaire, J. R. Fienup, “Nonlinear apodization for sidelobe control in SAR imagery,” IEEE Trans. Aerosp. Electron. Syst. 31, 267–278 (1995).
[CrossRef]

Eichel, P. H.

C. V. Jakowatz, D. E. Wahl, P. H. Eichel, D. C. Ghiglia, P. A. Thompson, Spotlight-Mode Synthetic Aperture Radar: A Signal Processing Approach (Kluwer, Boston, 1996).
[CrossRef]

Fienup, J. R.

H. C. Stankwitz, R. J. Dallaire, J. R. Fienup, “Nonlinear apodization for sidelobe control in SAR imagery,” IEEE Trans. Aerosp. Electron. Syst. 31, 267–278 (1995).
[CrossRef]

Ghiglia, D. C.

C. V. Jakowatz, D. E. Wahl, P. H. Eichel, D. C. Ghiglia, P. A. Thompson, Spotlight-Mode Synthetic Aperture Radar: A Signal Processing Approach (Kluwer, Boston, 1996).
[CrossRef]

Jakowatz, C. V.

C. V. Jakowatz, D. E. Wahl, P. H. Eichel, D. C. Ghiglia, P. A. Thompson, Spotlight-Mode Synthetic Aperture Radar: A Signal Processing Approach (Kluwer, Boston, 1996).
[CrossRef]

Oppenheim, A. V.

A. V. Oppenheim, R. W. Schafer, Digital Signal Processing (Prentice-Hall, New Jersey, 1975).

Schafer, R. W.

A. V. Oppenheim, R. W. Schafer, Digital Signal Processing (Prentice-Hall, New Jersey, 1975).

Stankwitz, H. C.

H. C. Stankwitz, R. J. Dallaire, J. R. Fienup, “Nonlinear apodization for sidelobe control in SAR imagery,” IEEE Trans. Aerosp. Electron. Syst. 31, 267–278 (1995).
[CrossRef]

Thompson, P. A.

C. V. Jakowatz, D. E. Wahl, P. H. Eichel, D. C. Ghiglia, P. A. Thompson, Spotlight-Mode Synthetic Aperture Radar: A Signal Processing Approach (Kluwer, Boston, 1996).
[CrossRef]

Wahl, D. E.

C. V. Jakowatz, D. E. Wahl, P. H. Eichel, D. C. Ghiglia, P. A. Thompson, Spotlight-Mode Synthetic Aperture Radar: A Signal Processing Approach (Kluwer, Boston, 1996).
[CrossRef]

IEEE Trans. Aerosp. Electron. Syst. (1)

H. C. Stankwitz, R. J. Dallaire, J. R. Fienup, “Nonlinear apodization for sidelobe control in SAR imagery,” IEEE Trans. Aerosp. Electron. Syst. 31, 267–278 (1995).
[CrossRef]

Other (2)

C. V. Jakowatz, D. E. Wahl, P. H. Eichel, D. C. Ghiglia, P. A. Thompson, Spotlight-Mode Synthetic Aperture Radar: A Signal Processing Approach (Kluwer, Boston, 1996).
[CrossRef]

A. V. Oppenheim, R. W. Schafer, Digital Signal Processing (Prentice-Hall, New Jersey, 1975).

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Figures (1)

Fig. 1
Fig. 1

(a) Unweighted detected SAR imagery of Washington, D.C., buildings. (b) Detected results of -40-dB Taylor-windowed SAR imagery. (c) Detected results of 2.0× oversampled SVA process. (d) Detected results of 1.3× oversampled sinc interpolated SVA process.

Tables (1)

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Table 1 Computational Comparison between 2.0× and 1.3× Polar-Formatted Spotlight-Mode Image Formation, SVA, Detection, and Final 1.3× Downsample Times

Equations (1)

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gm, n=gm, n+wmwnP+wmQm+wnQn,

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