A demonstrator of all-optronic multifunctional down-looking synthetic aperture LADAR

Wei Lu; Zhiyong Lu; Zhiwei Sun; Ning Zhang; Jianfeng Sun; Lijuan Wang; Liren Liu

doi:10.1117/12.2186478

4 September 2015 A demonstrator of all-optronic multifunctional down-looking synthetic aperture LADAR

Wei Lu, Zhiyong Lu, Zhiwei Sun, Ning Zhang, Jianfeng Sun, Lijuan Wang, Liren Liu

Proceedings Volume 9617, Unconventional Imaging and Wavefront Sensing 2015; 96170O (2015) https://doi.org/10.1117/12.2186478
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

The design and laboratory experiment of a demonstrator of all-optronic down-looking synthetic aperture imaging ladar (SAL) is presented in this paper, in which the sensing-to-processing chain is carried out with light. The ultra-fast processing capability from image acquisition to real-time reconstruction is shown. The demonstrator consists of a down-looking SAL unit with a beam scanner and an optical processor. The down-looking SAL unit has a transmitter of two coaxial orthogonally polarized beams and a receiver of polarization-interference self-heterodyne balanced detection. The linear phase modulation and the quadratic phase history are produced by the projection of movable cylindrical lenses. Three functions of strip-map mode, spotlight mode and static mode are available. The optical processor is an astigmatic optical system, which reduces to a Fourier transform system and a free-space of the Fresnel diffraction to realize the matched filtering. A spatial light modulator is used as the input interface. The experiment is performed with an optical collimator. The system design is given, too. The down-looking SAL has the features such as a big coverage with an enhanced receiving aperture and little influence from atmospheric turbulence and the optical processor is simple.

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Wei Lu, Zhiyong Lu, Zhiwei Sun, Ning Zhang, Jianfeng Sun, Lijuan Wang, and Liren Liu "A demonstrator of all-optronic multifunctional down-looking synthetic aperture LADAR", Proc. SPIE 9617, Unconventional Imaging and Wavefront Sensing 2015, 96170O (4 September 2015); https://doi.org/10.1117/12.2186478

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KEYWORDS

LIDAR

Image processing

Image resolution

Phase modulation

Phase shift keying

Spatial light modulators

Fourier transforms

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