Denoising Processing of Doppler Wind Lidar Data in Moving Measurement

Abstract

Abstract:

When the mobile wind lidar is carrying out moving measurement, the cumulation time in every direction is much shorter than that in static measurement, and moreover, the sky background, atmospheric turbulence, mechanical vibration, dark noise and electronic noise of detector can heavily worsen the quality of backscattering signal. As a result, the detection range of wind lidar is greatly limited. Moving average filter and median filter whose operation windows length vary with distance can improve the averaged signal to noise ratio by a factor of 2.8 in the altitude range from 12 km to 15 km, which can effectively expand the detection range.

Key words: mobile wind lidar, moving experiment, moving average filter, median filter, wind profile

CLC Number:

TN958.98

YIN Qi-Wei, LIU Zhi-Shen, LIU Bing-Yi, LI Zhi-Gang, YAO Qi. Denoising Processing of Doppler Wind Lidar Data in Moving Measurement[J]. Journal of Atmospheric and Environmental Optics, 2011, 6(4): 260-267.

References

[1] Clemesha B R, Kirchhoff V W J H, Simonich D M. Remote measurement of tropospheric and stratospheric winds by ground based lidar [J]. Applied Optics, 1981, 20(17): 2907-2910.
[2] Hall F F Jr, Huffaker R M, Hardesty R M, et al. Wind measurement accuracy of the NOAA pulsed infrared Doppler lidar [J]. Applied Optics, 1984, 23(15): 2503-2506.
[3] Rees D, McDermid S. Doppler lidar atmospheric wind sensor: reevaluation of a 355-nm incoherent Doppler lidar [J]. Applied Optics, 1990, 29(28): 4133-4144.
[4] Liu Z S, Chen W B, Zhang T L, et al. An incoherent Doppler lidar for ground-based atmospheric wind profiling [J]. Appl. Phys., 1997, 64(5): 561-566.
[5] Frehlich R, Hannon S M, Henderson S W. Coherent Doppler lidar measurements of winds in the weak signal regime [J]. Applied Optics, 1997, 36(15): 3491-3499. [6] Korb C L, Gentry B M, Li S X. Edge technique Doppler lidar wind measurements with high vertical resolution [J]. Applied Optics, 1997, 36(24): 5976-5983.
[7] Flesia C, Korb C L. Theory of the double-edge molecular technique for Doppler lidar wind measurement [J]. Applied Optics, 1999, 38(3): 432-440.
[8] Gentry B, Chen H L, Li S X. Wind measurements with 355-nm molecular Doppler lidar [J]. Optics Letters, 2000, 25(17): 1231-1233.
[9] Liu Z S, Wu D, Liu J T, et al. Low-altitude atmospheric wind measurement from the combined Mie and Rayleigh backscattering by Doppler lidar with an iodine filter [J]. Applied Optics, 2002, 41(33): 7079-7086.
[10] D Bruneau, A Garnier, A Hertzog, et al. Wind-velocity lidar measurements by use of a Mach-Zehnder interferometer, comparison with a Fabry-Perot interferometer [J]. Applied Optics, 2004, 43(1): 173-182.
[11] Liu Bingyi. Performance Optimization and Wind Field Retrieval for Mobile Wind Lidar [D]. Qingdao: Doctorial Dissertation of Ocean Remote Sensing Institute (ORSI), Ocean University of China, 2008: 1-2(in Chinese).
刘秉义. 车载测风激光雷达性能优化和风场反演 [D]. 青岛: 中国海洋大学海洋遥感研究所博士论文, 2008: 1-2.
[12] Wu S H, Liu Z S, Liu B Y. Enhancement of lidar backscatters signal-to-noise ratio using empirical mode decomposition method [J]. Optics Communications, 2006, 267(1): 137-144.
[13] Zhang Yujin. The Basis of Image Processing and Analysis [M]. Beijing: Higher Education Press, 2002: 108-109(in Chinese).
章毓晋. 图像处理和分析基础 [M]. 北京: 高等教育出版社, 2002: 108-109.
[14] Liu Z S, Liu B Y, Li Z G, et al. Wind measurements with incoherent Doppler lidar based on iodine filters at night and day [J]. Appl. Phys., 2007, 88(2): 327–335.
[15] Jiang HaiyanGe Runsheng. A new retrieval technique for Single-Doppler radar [J]. Quarterly Journal of Applied Meteorological Science, 1997, 8(2): 219-223(in Chinese).
姜海燕, 葛润生. 一种新的单多普勒雷达反演技术 [J]. 应用气象学报, 1997, 8(2): 219-223.