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Sliding DFT for Spectrum Analysis of Coherent Wind Lidar

  • Fugui Zhang
  • Yang Qi
  • Haijiang Wang
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 463)

Abstract

The Pulse Coherent Wind Lidar has a wide practical prospect in the field of atmospheric sounding. However, it confronts the contradiction that the spectral resolution and the range resolution can’t be improved at the same time under the technology of conventional spectrum analysis. Based on the motion’s continuity of the aerial aerosol and the air molecular space, this paper proposes a time-domain sliding DFT, which expanded the number of points in the database, to analyze the radial sampling data. then, the spectrum analysis results of traditional DFT, sliding DFT and windowing & sliding DFT were simulated in this paper; finally, the speed accuracy of above three methods were compared. The result shows that sliding DFT can effectively improve spectrum resolution and range resolution, but the speed accuracy is significantly influenced by wind speed shear, and the window functions can be adopted to restrain spectrum peak widening/multi-peak phenomenon so as to effectively control the speed accu-racy.

Keywords

Spectrum resolution Range resolution Sliding DFT Window Functions Energy concentration ratio 

Notes

Acknowledgement

National public welfare industry (meteorological) research special (GYHY201406038), Science & Technology Department of Sichuan Province (2016JY0106), Education Department of Sichuan Province (16ZA0209).

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Chengdu University of Information TechnologyChengduChina

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