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Improved short-term cross-correlation positioning method for chaos fiber fence system

A positioning method and cross-correlation technology, which is applied in the field of short-term cross-correlation positioning of chaotic fiber optic fence system, can solve problems such as difficult to solve, poor anti-interference, etc., and achieve the effect of reducing the requirement of positioning resolution and positioning accuracy

Inactive Publication Date: 2014-07-30
SHANGHAI UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The first method has poor anti-interference performance. The second method needs to measure the distance-correlation peak diagram in advance, and can only locate single-point disturbances. The local cross-correlation of the third method is also called short-term cross-correlation. This positioning method is sufficient It is a better method to locate multi-point disturbances by using the time variation of chaos and the similarity of waveform distribution between frames. However, if the starting point of the short time window is not optimized, the default is to divide the short time window from the starting point of the frame. window, the positioning accuracy will not be very high, and it is difficult to solve the contradiction between improving the positioning resolution and improving the distribution similarity of adjacent frames, that is, the short-term cross-correlation peak

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  • Improved short-term cross-correlation positioning method for chaos fiber fence system
  • Improved short-term cross-correlation positioning method for chaos fiber fence system
  • Improved short-term cross-correlation positioning method for chaos fiber fence system

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Embodiment 1

[0038] This improved short-term cross-correlation positioning method for chaotic fiber fences uses the sensitivity of chaos to the initial value as the detection mechanism, and uses the inherent frame structure characteristics of the output waveform of the chaotic ring laser and the distribution similarity of adjacent frame waveforms to locate the disturbance. It is characterized in that each frame of waveform is divided into N segments on average, and each segment is called a short time window, and the cross-correlation corresponding to the short-time window of two adjacent frames of waveform is calculated, that is, short-term cross-correlation, and the peak value of the short-time cross-correlation begins to decline The location of the intrusion in the ring is determined by the moment in the frame; the following steps are used for positioning:

[0039] (1) Determine the frame length τ: Continuously collect several frames of chaotic output waveform data, take more than one fra...

Embodiment 2

[0056] This embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0057] The chaotic time-domain waveform output by the chaotic ring laser is intensity chaotic or polarization chaotic; the chaotic ring laser has multiple variation forms, as long as its output waveform has frame structure characteristics, it can be used as a chaotic fiber fence system, And use this method to locate; said chaotic laser is composed of semiconductor optical amplifier SOA or erbium-doped fiber amplifier EDFA, or composed of semiconductor laser with external cavity; it is connected by optical fiber or optical waveguide, or connected by free space.

Embodiment 3

[0059] see Figure 1-Figure 6 . In this example, an erbium-doped fiber amplifier fiber ring laser is selected as a chaotic light source to form a chaotic fiber fence system. The system structure is as follows figure 1 shown. Here, the erbium-doped fiber amplifier 1 is the OFA1550 fiber amplifier module of Shanghai Tianbo Optoelectronics Company. Filter 2 is a filter produced by Shanghai Hanyu Company, with a center wavelength of 1550.12 nm. Coupler 3 is a 2 X 2 coupler from Shanghai Kangkuo Co., Ltd., with a splitting ratio of 50:50. Optical fibers 4 and 5 are G. 652 standard single-mode optical fibers, and the lengths are 25.268Km and 3.083Km respectively. The polarization controller 6 is an optical fiber squeezer with the model number PLC-001 from General Photonics, USA. The analyzer 7 is a model of POL-NTSS-FC / PC from General Photonics, USA. The photoelectric detector 8 is a PIN-TIA detector produced by Shenzhen Feitong Company. Oscilloscope 9 is PicoScope 5203 PC o...

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Abstract

The present invention disclosed a short -term interoperability positioning method of improving the chaotic fiber fence system.This method uses the sensitivity of chaos to the initial value to detect the mechanism, and uses the characteristics of frame structure characteristics inherently with chaotic ring laser output waveforms and the distribution of adjacent frame waveforms.Calculate the corresponding short -term window of the two adjacent frame waveforms, that is, short -term interoperability, and determine the invasion position in the ring at all times according to the peak of the short -term interconnection.The present invention effectively improves the accuracy of the positioning of the chaotic fiber fence system, and avoids the contradiction between improving the similarity of adjacent frame distribution, that is, short -term interdependence and improvement of positioning resolution.

Description

technical field [0001] The invention relates to a short-term cross-correlation positioning method of a time-domain waveform, in particular to an improved short-time cross-correlation positioning method of a chaotic optical fiber fence system. Background technique [0002] Chaos is a phenomenon in deterministic nonlinear dynamical systems. It has the characteristics of being sensitive to the initial value and the waveform will not repeat itself. It is especially suitable for distributed sensing systems. [0003] Optical amplifiers such as erbium-doped fiber amplifiers are used to form fiber ring lasers to generate chaotic light, and the time for light to circle around in the ring laser is a fixed constant τ. The output waveform of the chaotic ring laser within a τ time is called a frame. A chaotic communication system with open-loop delayed reception has been realized by using the frame structure characteristics of the chaotic ring laser output waveform and the similarity of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/26
Inventor 方捻路曼曼王陆唐黄肇明刘晨
Owner SHANGHAI UNIV