Comprehensive view of high-spectral-resolution lidar technique from the perspective of spectral discrimination

Zhongtao Cheng; Dong Liu; Yongying Yang; Jing Luo; Yupeng Zhang; Yudi Zhou; Jian Bai; Chong Liu; Yibing Shen

doi:10.1117/12.2223750

13 May 2016 Comprehensive view of high-spectral-resolution lidar technique from the perspective of spectral discrimination

Zhongtao Cheng, Dong Liu, Yongying Yang, Jing Luo, Yupeng Zhang, Yudi Zhou, Jian Bai, Chong Liu, Yibing Shen

Author Affiliations +

Proceedings Volume 9832, Laser Radar Technology and Applications XXI; 983213 (2016) https://doi.org/10.1117/12.2223750
Event: SPIE Defense + Security, 2016, Baltimore, MD, United States

Abstract

As already known commonly, high-spectral-resolution lidar technique (HSRL) employs a narrowband spectroscopic filter to separate the elastic backscattered aerosol signal from the thermal Doppler broadened molecular backscattered contribution. This paper presents a new and comprehensive view of HSRL technique from the perspective of spectral discrimination, without concretizing the analysis into a specific spectral discrimination filter. Based on a general HSRL layout with three-channel configuration, a theoretical model of retrieval error evaluation is introduced. In this model, we only take the error sources related to the spectral discrimination parameters into account, and ignore other error sources not associated with these focused parameters. This theoretical model is subsequently verified by Monte Carlo (MC) simulations. Both the model and MC simulations demonstrate that a large molecular transmittance and a large spectral discrimination ratio (SDR, i.e., ratio of the molecular transmittance to the aerosol transmittance) are beneficial to reduce the retrieval error. Moreover, we find that the signal-to-noise ratio (SNR) and SDR of the lidar system are often tradeoffs, and we suggest considering a suitable SDR for higher molecular transmittance (thus higher SNR) instead of using unnecessarily high SDR when designing the spectral discrimination filter. This view interprets the function of the narrowband spectroscopic filter in HSRL system essentially, and will provide some general guidelines for the reasonable design of the spectral discrimination filter for HSRL community.

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Zhongtao Cheng, Dong Liu, Yongying Yang, Jing Luo, Yupeng Zhang, Yudi Zhou, Jian Bai, Chong Liu, and Yibing Shen "Comprehensive view of high-spectral-resolution lidar technique from the perspective of spectral discrimination", Proc. SPIE 9832, Laser Radar Technology and Applications XXI, 983213 (13 May 2016); https://doi.org/10.1117/12.2223750

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KEYWORDS

Signal to noise ratio

Optical filters

Aerosols

LIDAR

Backscatter

Transmittance

Atmospheric modeling

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