Rapid early-warning method based on phase-sensitive optical time-domain reflectometer
A technology of time-domain reflectometer and phase-sensitive light, which is applied to alarms, alarms, and burglar alarms that rely on broken/disturbed ropes/metal wires to be straightened, and can solve the requirements of training templates, time-consuming calculations, complex technical issues
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Embodiment 1
[0067] Embodiment 1 is a rapid early warning method using zero-crossing rate to extract features, including disturbance monitoring and positioning, disturbance signal identification and other parts.
[0068] Disturbance monitoring and positioning is to use the intensity signal of phase optical time domain reflectometer to monitor and locate the disturbance along the optical fiber. Disturbance signal identification includes preprocessing, feature extraction, template training, pattern classification and postprocessing. Preprocessing is to perform simple denoising and other processing on the phase time signal of the disturbance point. The preprocessed signal is divided into several data frames, and the zero-crossing rate of each frame is calculated. When it is greater than the threshold, the signal of the frame is used as the characteristic signal. Template training is based on the characteristics of a series of different types of disturbance signals to construct templates for m...
Embodiment 2
[0069] Embodiment 2 is a rapid early warning method using short-term energy extraction features, including disturbance monitoring and positioning, disturbance signal identification and other parts.
[0070] Disturbance monitoring and positioning is to use the intensity signal of phase optical time domain reflectometer to monitor and locate the disturbance along the optical fiber. Disturbance signal identification includes preprocessing, feature extraction, template training, pattern classification and postprocessing. Preprocessing is to perform simple denoising and other processing on the phase time signal of the disturbance point. The preprocessed signal is divided into several data frames, and the short-term energy of each frame is calculated. When it is greater than the threshold, the signal of the frame is used as the characteristic signal. Template training is based on the characteristics of a series of different types of disturbance signals to construct templates for mul...
Embodiment 3
[0071] Embodiment 3 is a rapid early warning method using zero-crossing rate and short-term energy and logical extraction features, including disturbance monitoring and positioning, disturbance signal identification and other parts.
[0072] Disturbance monitoring and positioning is to use the intensity signal of phase optical time domain reflectometer to monitor and locate the disturbance along the optical fiber. Disturbance signal identification includes preprocessing, feature extraction, template training, pattern classification and postprocessing. Preprocessing is to perform simple denoising and other processing on the phase time signal of the disturbance point. The preprocessed signal is divided into several data frames, and the zero-crossing rate and short-term energy of each frame are calculated. When both are greater than the threshold, the signal of the frame is used as the characteristic signal. Template training is based on the characteristics of a series of differe...
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