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Holographic aperture ladar.

Bradley D Duncan1, Matthew P Dierking

  • 1University of Dayton Electro-Optics Program, Ohio, USA. brad@udayton.edu

Applied Optics
|April 10, 2013
PubMed
Summary
This summary is machine-generated.

Holographic aperture ladar (HAL) enhances resolution by synthesizing a large aperture using a sensor array and advanced signal processing. This technique achieves significant resolution gains in airborne applications, even with moving transmitters and receivers.

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Area of Science:

  • * Optical Engineering
  • * Remote Sensing
  • * Signal Processing

Background:

  • * Synthetic aperture ladar (SAL) traditionally uses a single moving point detector to synthesize a larger aperture.
  • * Conventional SAL has limitations in achieving high cross-range resolution, especially in complex scenarios.

Purpose of the Study:

  • * To develop holographic aperture ladar (HAL) transformations for enhanced cross-range resolution.
  • * To investigate stripmap and spotlight HAL transformations for synthesizing larger effective apertures.
  • * To address challenges of moving transmitters and receivers in airborne applications.

Main Methods:

  • * Utilizing a two-dimensional translating sensor array instead of a point detector.
  • * Developing stripmap and spotlight holographic aperture transformations.
  • * Coherently stitching sequentially collected pupil plane field segments.
  • * Implementing proper phasing and correlation of detected signals in postprocessing.

Main Results:

  • * Achieved resolution enhancements exceeding two times (stripmap) and three times (spotlight) the ratio of synthetic to real aperture diameter.
  • * Demonstrated HAL's robustness to scene depth variations with accurate range estimation.
  • * Successfully formed images in two orthogonal cross-range dimensions.

Conclusions:

  • * Holographic aperture ladar offers a significant advancement over conventional SAL for high-resolution imaging.
  • * The developed transformations enable the synthesis of complex, large-extent pupil plane fields.
  • * HAL is a practical and effective technique for airborne remote sensing applications.