Telescope aperture optimization for spacebased coherent wind lidar

Xian-ying Ge; Jun Zhu; Qipeng Cao; Yinchao Zhang; Huan Yin; Xiaojing Dong; Chao Wang; Yongchao Zhang; Ning Zhang

doi:10.1117/12.2189706

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5 August 2015 Telescope aperture optimization for spacebased coherent wind lidar

Xian-ying Ge, Jun Zhu, Qipeng Cao, Yinchao Zhang, Huan Yin, Xiaojing Dong, Chao Wang, Yongchao Zhang, Ning Zhang

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Proceedings Volume 9621, 2015 International Conference on Optical Instruments and Technology: Advanced Lasers and Applications; 96210L (2015) https://doi.org/10.1117/12.2189706
Event: International Conference on Optical Instruments and Technology 2015, 2015, Beijing, China

Abstract

Many studies have indicated that the optimum measurement approach for winds from space is a pulsed coherent wind lidar, which is an active remote sensing tool with the characteristics that high spatial and temporal resolutions, real-time detection, high mobility, facilitated control and so on. Because of the significant eye safety, efficiency, size, and lifetime advantage, 2μm wavelength solid-state laser lidar systems have attracted much attention in spacebased wind lidar plans. In this paper, the theory of coherent detection is presented and a 2μm wavelength solid-state laser lidar system is introduced, then the ideal aperture is calculated from signal-to-noise(SNR) view at orbit 400km. However, considering real application, even if the lidar hardware is perfectly aligned, the directional jitter of laser beam, the attitude change of the lidar in the long round trip time of the light from the atmosphere and other factors can bring misalignment angle. So the influence of misalignment angle is considered and calculated, and the optimum telescope diameter(0.45m) is obtained as the misalignment angle is 4 μrad. By the analysis of the optimum aperture required for spacebased coherent wind lidar system, we try to present the design guidance for the telescope.

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Xian-ying Ge, Jun Zhu, Qipeng Cao, Yinchao Zhang, Huan Yin, Xiaojing Dong, Chao Wang, Yongchao Zhang, and Ning Zhang "Telescope aperture optimization for spacebased coherent wind lidar", Proc. SPIE 9621, 2015 International Conference on Optical Instruments and Technology: Advanced Lasers and Applications, 96210L (5 August 2015); https://doi.org/10.1117/12.2189706

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