Optimization analysis of telescope aperture and truncation factor of coherent LIDAR

Bu Zhichao; Guo Pan; Chen Siying; Zhang Yinchao; Chen He; Chen Shengzhe; Ge Xianying

Based on coherent Doppler LIDAR heterodyne detection theory, the heterodyne efficiency analytical expression under both free-space and fiber-coupled detect mode of the coaxial system were unified through the parameter substitution. Combined this formula with the signal-to-noise ratio under turbulent environment, the optimum values of the aperture and the truncation factor under different detection range were obtained for ground based and spaceborne system. The results show that the signal- to-noise ratio of the ground based LIDAR is relatively steep as the telescope aperture changes, the optimum truncation factor is 80% during the whole detect range, and if the aperture selected is not appropriate, it will cause losses of signal-to-noise huge in the system; For Spaceborne LIDAR the signal- to-noise ratio is first increased and then stable as the telescope aperture increased, the optimum telescope aperture can be balanced between the cost and signal-to-noise, and the optimum truncation factor is also 80%. The research has important theoretical significance and practical value both for the development of detection theory and optimal configuration of the coherent Doppler LIDAR.

1. Key Laboratory of Photoelectronic Imaging Technology and System,Ministry of Education of China,Beijing Institute of Technology,Beijing 100086,China

Received Date: 2013-07-20

Rev Recd Date: 2013-08-03

Publish Date: 2014-03-25

Key words:

Abstract: Based on coherent Doppler LIDAR heterodyne detection theory, the heterodyne efficiency analytical expression under both free-space and fiber-coupled detect mode of the coaxial system were unified through the parameter substitution. Combined this formula with the signal-to-noise ratio under turbulent environment, the optimum values of the aperture and the truncation factor under different detection range were obtained for ground based and spaceborne system. The results show that the signal- to-noise ratio of the ground based LIDAR is relatively steep as the telescope aperture changes, the optimum truncation factor is 80% during the whole detect range, and if the aperture selected is not appropriate, it will cause losses of signal-to-noise huge in the system; For Spaceborne LIDAR the signal- to-noise ratio is first increased and then stable as the telescope aperture increased, the optimum telescope aperture can be balanced between the cost and signal-to-noise, and the optimum truncation factor is also 80%. The research has important theoretical significance and practical value both for the development of detection theory and optimal configuration of the coherent Doppler LIDAR.

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Reference (25)

[1]
[2]	Huffaker R M. Laser Doppler detection systems for gas velocity measurement [J]. Applied Optics, 1970, 9(5): 1026- 1039.
[3]
[4]	Yang Yanling, Li Yanchao, Gao Long, et al. Numerical simulation of balanced heterodyne detection for coherent lidar[J]. Infrared and Laser Engineering, 2011, 40(10): 1918-1922. (in Chinese) 杨彦玲, 李彦超, 高龙, 等. 相干激光雷达平衡外差探测方法的数值仿真[J]. 红外与激光工程, 2011, 40(10): 1918- 1922.
[5]	Qu Zengfeng, Jin Chenfei, Zhao Yuan, et al. Theoretical analysis of structure and operation range calculation of a novel fiber lidar [J]. Infrared and Laser Engineering, 2009, 38(02): 300-303. (in Chinese) 屈增风, 靳辰飞, 赵远, 等. 新型光纤激光雷达的结构理论分析与作用距离计算[J]. 红外与激光工程, 2009, 38(02): 300-303.
[6]
[7]
[8]	Sun Yang, Yuan Shuai, Wu Qian, et al. Laser coherent detection on Micro-Doppler effect of rotational target [J]. Infrared and Laser Engineering , 2011, 38(6): 1054-1058. (in Chinese) 孙洋, 原帅, 吴婧, 等. 转动目标微多普勒效应的激光相干探测[J]. 红外与激光工程, 2011, 38(6): 1054-1058.
[9]	Kin P C, Dennis K K, Nobuo S. Heterodyne Doppler 1-m lidar measurement of reduced effective telescope aperture due to atmospheric turbulence [J]. Applied Optics, 1991, 30(18): 2617-2627.
[10]
[11]
[12]	Schwiesow R L, Calfee R F. Atmospheric refractive effects on coherent lidar performance at 10.6 m[J]. Applied Optics, 1979, 18(23): 3911-3917.
[13]	Wang J Y. Optimum truncation of a lidar transmitted beam[J]. Applied Optics, 1988, 27(21): 4470-4474.
[14]
[15]
[16]	Zhao Yanzeng, Post M J, Hardesty R M. Receiving efficiency of monostatic pulsed coherent lidars. 1: theory [J]. Applied Optics, 1990, 29(28): 4111-4119.
[17]	Targ Russell, Kavaya M J, Huffaker R M, et al. Coherent lidar airborne windshear sensor: performance evaluation [J]. Applied Optics, 1991, 30(15): 2013-2026.
[18]
[19]
[20]	Sasiela R J. Electromagnetic Wave Propagation in Turbulence: Evaluation and Application of Mellin Transforms [M]. Bellingham: SPIE Press, 2007: 96-100.
[21]	Siegman A E. The antenna properties of optical heterodyne receivers[J]. Proceedings of the IEEE, 1966, 54(10): 1350- 1356.
[22]
[23]	Bu Zhichao, Chen Siying, Zhang Yinchao, et al. Numerical analysis and calculation of heterodyne efficiency of coherent Doppler wind Lidar [J]. Transactions of Beijing Institute of Technology, 2012, 32(8): 824-843. (in Chinese) 步志超, 陈思颖, 张寅超, 等. 相干多普勒测风激光雷达外差效率的数值计算与分析[J]. 北京理工大学学报, 2012, 32(8): 824-843.
[24]
[25]	Emmitt G D. Combining direct and coherent detection for Doppler wind lidar[C]//SPIE, 2004, 5575: 31-37.

Optimization analysis of telescope aperture and truncation factor of coherent LIDAR

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