Volume 9 Issue 1
Feb.  2020
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LI Daojing, ZHU Yu, HU Xuan, et al. Laser application and sparse imaging analysis of diffractive optical system[J]. Journal of Radars, 2020, 9(1): 195–203. doi: 10.12000/JR19081
Citation: LI Daojing, ZHU Yu, HU Xuan, et al. Laser application and sparse imaging analysis of diffractive optical system[J]. Journal of Radars, 2020, 9(1): 195–203. doi: 10.12000/JR19081

Laser Application and Sparse Imaging Analysis of Diffractive Optical System

doi: 10.12000/JR19081
Funds:  The Major Project of High-Resolution Earth Observation System of China (GF0314)
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  • Corresponding author: LI Daojing, lidj@mail.ie.ac.cn
  • Received Date: 2019-09-09
  • Rev Recd Date: 2020-02-03
  • Available Online: 2020-02-24
  • Publish Date: 2020-02-28
  • In recent years, the diffractive optical systems have developed rapidly. Diffractive devices such as binary optical device and membrane-based lens are equivalent to fixed phase shifters of microwave antennas. Thus, the mature theories and methods of a microwave phased-array antenna could be used for diffractive devices’ performance analysis. Both laser Synthetic Aperture Radar (SAR) and laser communication feature a single color and long wavelength, and they are specifically suitable for non-imaging diffractive optical systems. A signal wave front control realized by a diffraction device reduces the focal length and the weight of a system. Research on laser SAR and laser communication technology has important theoretical significance and application value for diffractive optical system. In this paper, we provide a phased-array interpretation of a diffractive optical system and introduce research that has been conducted on airborne and spaceborne laser SAR with respect to diffractive optical systems. We propose the concept of shipborne 1 m diffraction aperture laser communication and an interferometric positioning system and analyze its performance. The results indicated that, using a 10 m short baseline, this system can reach 400 million km with a corresponding positioning accuracy of 6 km that is suitable for use during deep space probes. We also discuss the sparse-sampling laser-imaging problem using a laser to illuminate the target, transforming the laser image signal into the frequency domain with Fourier lens, using the small-scale detector to perform sparse sampling in the low-frequency domain, and reconstructing the target image using a computer. Some preliminary simulation results are provided.

     

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