Self-compensation high-speed spatial wavefront modulator of down-looking synthetic aperture ladar

Li Guangyuan; Sun Jianfeng; Zhou Yu; Lu Zhiyong; Zhang Guo; Xu Mengmeng; Zhang Bo

doi:10.3788/IRLA201847.1030001

A high-speed phase modulation of down-looking synthetic aperture ladar was proposed. The spatially polarized beam was divided into two coaxial and polarization-orthogonal beams. In the orthogonal direction of travel, the two beams were modulated to sinusoidal phases, whose changing directions were contrary; in the travel direction, these two beams were modulated with different curvatures to a quadratic phase history,which was associated with position of the targets in slow-time axis. This modulation method has the function of automatic jitter compensation in the azimuthal direction, and can effectively prevent the platform jitter effects on imaging.

Self-compensation high-speed spatial wavefront modulator of down-looking synthetic aperture ladar

1. Key Laboratory of Space Laser Communication and Detection Technology,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;

2. University of Chinese Academy of Sciences,Beijing 100049,China

Received Date: 2018-05-11

Rev Recd Date: 2018-06-12

Publish Date: 2018-10-25

Key words:

Abstract: A high-speed phase modulation of down-looking synthetic aperture ladar was proposed. The spatially polarized beam was divided into two coaxial and polarization-orthogonal beams. In the orthogonal direction of travel, the two beams were modulated to sinusoidal phases, whose changing directions were contrary; in the travel direction, these two beams were modulated with different curvatures to a quadratic phase history,which was associated with position of the targets in slow-time axis. This modulation method has the function of automatic jitter compensation in the azimuthal direction, and can effectively prevent the platform jitter effects on imaging.

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Reference (18)

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Self-compensation high-speed spatial wavefront modulator of down-looking synthetic aperture ladar

doi: 10.3788/IRLA201847.1030001

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