摘要
在光纤振动信号检测系统中,使用相位敏感光时域反射技术,可检测长距离的光纤振动信号,但反射回的光信号都有大量的振动杂波和噪声,导致振动检测信号的虚警率较高。提出采用单元平均恒虚警(CA-CFAR)和有序统计恒虚警(OS-CFAR)二级检测算法,保持虚警率稳定,既提高了运算速度,也改善了参考单元中存在多个目标的检测性能,并提出利用蒙特卡罗方法确定二级检测的门限系数,最后通过蒙特卡罗仿真及现场实验验证,对算法进行了性能分析,验证了算法的可行性以及有效性。
In the detection system, the long distance optical fiber vibration can be detected by phase-sensitive optical time domain reflect technique. However, the reflected signals include clutters and noises, which leads to a high false alarm rate. A two-level detection algorithm, which can maintain constant false alarm rate, is proposed, including cell average constant false alarm alarm rate （OS-CFAR） which work in serial ways, and rate （CA-CFAR） and ordered statistics constant false the detection speed of CA-CFAR and the performance of OS-CFAR are conserved, respectively. Monte Carlo simulation is applied to determine the threshold of two- level detection. Finally, Monte Carlo simulation and the experiment on the scene are applied to analyze the performance of the algorithm, which proves the feasibility and effectiveness.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2015年第10期67-73,共7页
Acta Optica Sinica
基金
国家自然科学基金(61571014)
关键词
信号处理
振动信号检测
二级检测
蒙特卡罗
signal processing
vibration signals detection
two-level detection
Monte Carlo
