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Noise modeling by the trend of each range gate for coherent Doppler LIDAR

机译:通过相干多普勒激光雷达每个测距门的趋势进行噪声建模

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摘要

A denoising method of all-fiber pulsed coherent Doppler LIDAR (CDL) Is investigated. The goal is to enhance the signal-to-noise ratio (SNR) in the weak signal regime. Based on differential detection theory, the total noise expression of CDL with a dual-balanced detector is introduced and analyzed. The conclusion is drawn that the total noise can be acquired under the local oscillator laser exposure conditions by reasonable simplification. Using the actual measured data, the ratio of the standard deviation to the mean value of the total noise in each range gate is obtained and is up to approximately 11%. In order to suppress the jitter of the noise, an effective noise modeling by the trend of each range gate is developed. The feasibility of this method is verified by a long set of measured data. The spatial and temporal distribution of wind speed is illustrated with 400 pulses accumulation. Compared to the noise modeling of the tail, the detection range of wind speed using the proposed method can be improved by 35.3%.
机译:研究了全光纤脉冲相干多普勒激光雷达(CDL)的去噪方法。目标是在弱信号状态下提高信噪比(SNR)。基于差分检测理论,介绍并分析了双平衡检测器对CDL的总噪声表达。结论是,通过合理简化,可以在局部振荡器激光曝光条件下获得总噪声。使用实际测量数据,可以获得每个范围门中的标准偏差与总噪声平均值的比率,最高可达11%。为了抑制噪声的抖动,根据每个范围门的趋势开发了有效的噪声建模。大量的测量数据证明了该方法的可行性。风速的时空分布显示为400个脉冲累积。与尾部噪声建模相比,所提方法对风速的检测范围可提高35.3%。

著录项

  • 来源
    《Optical engineering》 |2014年第6期|063109.1-063109.6|共6页
  • 作者单位

    Beijing Institute of Technology, School of Opto-Electronics, No. 5 Zhongguancun South Str, Beijing 100081, China;

    Beijing Institute of Technology, School of Opto-Electronics, No. 5 Zhongguancun South Str, Beijing 100081, China;

    Beijing Institute of Technology, School of Opto-Electronics, No. 5 Zhongguancun South Str, Beijing 100081, China;

    Beijing Institute of Technology, School of Opto-Electronics, No. 5 Zhongguancun South Str, Beijing 100081, China;

    Beijing Institute of Technology, School of Opto-Electronics, No. 5 Zhongguancun South Str, Beijing 100081, China;

    Beijing Institute of Technology, School of Opto-Electronics, No. 5 Zhongguancun South Str, Beijing 100081, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    coherent Doppler LIDAR; dual-balanced detector; noise modeling; wind speed distribution; polynomial fitting;

    机译:相干多普勒激光雷达双平衡探测器噪声建模;风速分布多项式拟合;

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