OSA's Digital Library

Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 22 — Aug. 1, 2012
  • pp: 5531–5542

Demonstrated resolution enhancement capability of a stripmap holographic aperture ladar system

Samuel M. Venable, III, Bradley D. Duncan, Matthew P. Dierking, and David J. Rabb  »View Author Affiliations


Applied Optics, Vol. 51, Issue 22, pp. 5531-5542 (2012)
http://dx.doi.org/10.1364/AO.51.005531


View Full Text Article

Enhanced HTML    Acrobat PDF (1541 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

Holographic aperture ladar (HAL) is a variant of synthetic aperture ladar (SAL). The two processes are related in that they both seek to increase cross-range (i.e., the direction of the receiver translation) image resolution through the synthesis of a large effective aperture. This is in turn achieved via the translation of a receiver aperture and the subsequent coherent phasing and correlation of multiple received signals. However, while SAL imaging incorporates a translating point detector, HAL takes advantage of a two-dimensional translating sensor array. For the research presented in this article, a side-looking stripmap HAL geometry was used to sequentially image a set of Ronchi ruling targets. Prior to this, theoretical calculations were performed to determine the baseline, single subaperture resolution of our experimental, laboratory-based system. Theoretical calculations were also performed to determine the ideal modulation transfer function (MTF) and expected cross-range HAL image sharpening ratio corresponding to the geometry of our apparatus. To verify our expectations, we first sequentially captured an oversampled collection of pupil plane field segments for each Ronchi ruling. A HAL processing algorithm incorporating a high-precision speckle field registration process was then employed to phase-correct and reposition the field segments. Relative interframe piston phase errors were also removed prior to final synthetic image formation. By then taking the Fourier transform of the synthetic image intensity and examining the fundamental spatial frequency content, we were able to produce experimental modulation transfer function curves, which we then compared with our theoretical expectations. Our results show that we are able to achieve nearly diffraction-limited results for image sharpening ratios as high as 6.43.

© 2012 Optical Society of America

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(280.3640) Remote sensing and sensors : Lidar
(280.6730) Remote sensing and sensors : Synthetic aperture radar
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Remote Sensing and Sensors

History
Original Manuscript: April 3, 2012
Revised Manuscript: June 28, 2012
Manuscript Accepted: July 1, 2012
Published: July 30, 2012

Citation
Samuel M. Venable, Bradley D. Duncan, Matthew P. Dierking, and David J. Rabb, "Demonstrated resolution enhancement capability of a stripmap holographic aperture ladar system," Appl. Opt. 51, 5531-5542 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-22-5531


Sort:  Author  |  Year  |  Journal  |  Reset  

References

  1. S. M. Beck, J. R. Buck, W. F. Buell, R. P. Dickinson, D. A. Kozlowski, N. J. Marechal, and T. J. Wright, “Synthetic-aperture imaging laser radar: laboratory demonstration and signal processing,” Appl. Opt. 44, 7621–7629 (2005). [CrossRef]
  2. B. D. Duncan and M. P. Dierking, “Holographic aperture ladar,” Appl. Opt. 48, 1168–1177 (2009). [CrossRef]
  3. J. W. Stafford, B. D. Duncan, and M. P. Dierking, “Experimental demonstration of a stripmap holographic aperture ladar system,” Appl. Opt. 49, 2262–2270 (2010). [CrossRef]
  4. J. W. Goodman, Introduction to Fourier Optics, 3rd ed.(Roberts, 2005), Chaps. 3, 4, and 6.
  5. F. G. Stremler, Introduction to Communication Systems, 3rd ed. (Addison-Wesley, 1990), Chap. 3.
  6. M. Guizar-Sicairos, S. T. Thurman, and J. R. Fienup, “Efficient subpixel image registration algorithms,” Opt. Lett. 33, 156–158 (2008). [CrossRef]
  7. M. A. Richards, Fundamentals of Radar Signal Processing (McGraw-Hill, 2005), Chap. 8.
  8. M. Guizar, Efficient Subpixel Image Registration by Cross-Correlation (Matlab Central, MathWorks, Inc., 1994–2011). http://www.mathworks.com/matlabcentral/fileexchange/18401-efficient-subpixel-image-registration-by-cross-correlation .
  9. J. R. Fienup and J. J. Miller, “Aberration correction by maximizing generalized sharpness metrics,” J. Opt. Soc. Am. A 20, 609–619 (2003). [CrossRef]
  10. D. J. Rabb, D. F. Jameson, J. W. Stafford, and A. J. Stokes, “Distributed aperture synthesis,” Opt. Express 18, 10334–10342 (2010). [CrossRef]
  11. S. T. Thurman and J. R. Fienup, “Phase-error correction in digital holography,” J. Opt. Soc. Am. A 25, 983–994 (2008). [CrossRef]
  12. R. Binet, J. Colineau, and J.-C. Lehureau, “Short-range synthetic aperture imaging at 633 nm by digital holography,” Appl. Opt. 41, 4775–4782 (2002). [CrossRef]
  13. J.-C. Lehureau and J. Colineau, “Optical synthetic aperture imagery,” Proc. SPIE 5816, 54–65 (2005). [CrossRef]
  14. A. E. Tippie and J. R. Fienup, “Multiple-plane anisoplanatic phase correction in a laboratory digital holography experiment,” Opt. Lett. 35, 3291–3293 (2010). [CrossRef]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.


« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited