北京航空航天大学学报 ›› 2017, Vol. 43 ›› Issue (5): 992-997.doi: 10.13700/j.bh.1001-5965.2016.0320

• 论文 • 上一篇    下一篇

激光多普勒测速系统自适应阈值检测算法

黄鑫, 胡姝玲, 牛燕雄, 李晓佩, 李军, 刘冬雪   

  1. 北京航空航天大学 仪器科学与光电工程学院, 北京 100083
  • 收稿日期:2016-04-19 出版日期:2017-05-20 发布日期:2017-05-27
  • 通讯作者: 胡姝玲,E-mail:hulxi@buaa.edu.cn E-mail:hulxi@buaa.edu.cn
  • 作者简介:黄鑫,男,硕士研究生。主要研究方向:激光测速雷达;胡姝玲,女,博士,副教授。主要研究方向:激光器及其应用;牛燕雄,男,博士,教授,博士生导师。主要研究方向:激光对抗;李晓佩,女,硕士研究生。主要研究方向:光纤隔离器;李军,男,硕士研究生。主要研究方向:激光测速雷达;刘冬雪,女,硕士研究生。主要研究方向:激光测速雷达。

Adaptive threshold detection algorithm of LDV system

HUANG Xin, HU Shuling, NIU Yanxiong, LI Xiaopei, LI Jun, LIU Dongxue   

  1. School of Instrumentation Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2016-04-19 Online:2017-05-20 Published:2017-05-27

摘要: 信号检测是激光多普勒测速 (LDV) 系统实现高精度的关键技术,针对LDV中微弱多普勒信号的检测,本文从噪声在频域中的统计特性出发,对多普勒信号进行带阻滤波,结合雷达的恒虚警(CFAR)检测技术,设计了基于频域的单元平方和自适应阈值检测算法以解决在低信噪比(SNR)的环境中LDV的信号检测问题,提高LDV的信号探测能力,同时降低其虚警概率。仿真与实验的结果表明:该算法与固定阈值相比可以在SNR为-12 dB时实现信号的完全检测,保持低虚警概率,运算简单,工程适用性强。

关键词: 激光多普勒测速(LDV)系统, 频域信号检测, 恒虚警(CFAR), 低信噪比(SNR), 自适应阈值

Abstract: Signal detection is the key technology for the high precision of laser Doppler velocimetry (LDV) system. In order to achieve the accurate detection of the weak Doppler signal in LDV, we carried out a band-stop filtering toward the Doppler signal on the ground of the statistical characteristics of the noise in frequency domain. Combined with the constant false alarm rate (CFAR) detection technology of radar, an algorithm of adaptive threshold detection based on the sum of unit square in frequency domain is proposed so as to address the difficulty in signal detection within the atmosphere of low signal noise ratio (SNR), improving the detection performance and decreasing the probability of false alarm. Compared with the fixed threshold through simulations and experiments, this algorithm boasts the advantage of complete detection under the circumstance of SNR -12 dB while maintaining a relatively lower false alarm rate and simple operation as well as great applicability.

Key words: laser Doppler velocimetry (LDV) system, signal detection in frequency domain, constant false alarm rate (CFAR), low signal noise ratio (SNR), adaptive threshold

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