CN103337120B - The addressing method of quasi-distributed fiber grating circumference intrusion alarm system and system - Google Patents
The addressing method of quasi-distributed fiber grating circumference intrusion alarm system and system Download PDFInfo
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- CN103337120B CN103337120B CN201310258623.4A CN201310258623A CN103337120B CN 103337120 B CN103337120 B CN 103337120B CN 201310258623 A CN201310258623 A CN 201310258623A CN 103337120 B CN103337120 B CN 103337120B
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Abstract
The invention discloses a kind of addressing method and system of quasi-distributed fiber grating circumference intrusion alarm system, wherein method comprises the following steps: the real-time wavelength data message obtaining each fiber-optic grating sensor; Calculate fiber grating sensor wavelength reference value, and the impact of deduction temperature drift effect; Calculate fiber grating sensor wavelength change of error amount, and judge whether this wavelength offset variable quantity meets the threshold of sensitivity trigger condition pre-set; If meet, then choose the time dependent data sequence of wavelength offset of predetermined time period, and calculate the signal low frequency energy in this period; Calculating the low frequency energy of the fiber-optic grating sensor closed on, and compare, select the fiber-optic grating sensor with maximum low frequency energy, is invasion address by its location recognition, to report to the police.Invention increases the addressing precision to intrusion behavior, the environmental suitability of system is strengthened, facilitates the marketing of fiber grating circumference intrusion alarm system.
Description
Technical field
The present invention relates to circumference security and guard technology and optical fiber grating sensing network signal processing method field, particularly relate to a kind of addressing method and system of quasi-distributed fiber grating circumference intrusion alarm system.
Background technology
Existing Fiber Bragg Grating intelligently addressing circumference invasion self-adaptive warning system (CN101840615) is mainly by judging whether the size of single-sensor wave-type vibration amplitude to report to the police.The location of optical fiber perimeter intrusion system (CN101556724) existence is simultaneously inaccurate, the defect that rate of false alarm is higher.The intrusion detection of anti-intrusion system sensing network and localization method (CN101860866B) for be extraction to single-sensor characteristic information; The mode that the implementation method (CN101639963) of optical fiber vibration processor system utilizes FPGA and DSP to combine is processed by SVM algorithm, and data processing algorithm is comparatively complicated.Temporal envelope signal is asked for utilizing Hilbert to convert through pretreated signal based on temporal envelope analysis fiber grating circumference intrusion behavior recognition methods and system (CN102968868); Framing is carried out to temporal envelope signal, and characteristic parameter extraction is carried out to the temporal envelope signal of every frame; The pattern-recognition of vibration behavior is carried out according to the value of characteristic parameter and the characteristic parameter threshold that presets.A kind of intrusion prevention system of fiber grating perimeter and alarm method (CN102521939) thereof carry out frequency domain resolution to the wavelength information of the abnormal signal under pre-alarm state, retain effective illegal invasion behavioural information, complete alarm procedure.All there is lower column defects and apply bottleneck in these systems: (1) cannot accurately locate, and cannot meet among a small circle, the demand in high-grade strick precaution field; (2) the environment resistant ability of system time under high sensitivity condition, rate of false alarm are high, cause range of application to be restricted.
Summary of the invention
The technical problem to be solved in the present invention be in prior art under high sensitivity condition, accurately can not identify invasion position, the defect that the rate of false alarm of system is higher, under a kind of high sensitivity condition is provided, accurately can identify invasion position, the rate of false alarm index of further reduction system, improves addressing method and the system of the quasi-distributed fiber grating circumference intrusion alarm system of system reliability.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of addressing method of quasi-distributed fiber grating circumference intrusion alarm system is provided, comprises the following steps:
Obtain the real-time wavelength data message of each fiber-optic grating sensor;
Fiber grating sensor wavelength reference value is calculated according to described real-time wavelength data message, and the impact that deduction temperature drift effect is extracted vibration signal;
Calculate fiber grating sensor wavelength change of error amount according to described wavelength reference, and judge whether this wavelength offset variable quantity meets the threshold of sensitivity trigger condition pre-set;
If wavelength offset variable quantity meets the threshold of sensitivity trigger condition pre-set, then choose the time dependent data sequence of wavelength offset of predetermined time period, and calculate the signal low frequency energy of this section of time inner fiber grating sensor;
Calculating the low frequency energy of the fiber-optic grating sensor closed on, and compare, select the fiber-optic grating sensor with maximum low frequency energy, is invasion address by the location recognition of this fiber-optic grating sensor, to report to the police.
In method of the present invention, described low frequency energy is the signal spectrum component sum in 0.5-10Hz frequency range.
In method of the present invention, described fiber-optic grating sensor is connected on a vibration optical cable, and vibration optical cable is that line style is laid.
In method of the present invention, described in the fiber-optic grating sensor that closes on be first three and rear three sensors of the sensor meeting the threshold of sensitivity trigger condition pre-set.
The present invention solves another technical scheme that its technical matters adopts:
A kind of addressing system of quasi-distributed fiber grating circumference intrusion alarm system is provided, comprises:
Real-time wavelength data message acquisition module, for obtaining the real-time wavelength data message of each fiber-optic grating sensor;
Wavelength reference computing module, for calculating fiber grating sensor wavelength reference value according to described real-time wavelength data message, and the impact that deduction temperature drift effect is extracted vibration signal;
Wavelength offset variable quantity computing module, for calculating fiber grating sensor wavelength change of error amount according to described wavelength reference;
Judge module, for judging whether wavelength offset variable quantity meets the threshold of sensitivity trigger condition pre-set;
Signal low frequency energy computing module, for when wavelength offset variable quantity meets the threshold of sensitivity trigger condition pre-set, choose the time dependent data sequence of wavelength offset of predetermined time period, and calculate the signal low frequency energy of this section of time inner fiber grating sensor; And calculate the low frequency energy of the fiber-optic grating sensor closed on;
Addressing module, for comparing the low frequency energy of the fiber-optic grating sensor closed on, selects the fiber-optic grating sensor with maximum low frequency energy, is invasion address, to report to the police by the location recognition of this fiber-optic grating sensor.
In system of the present invention, the low frequency energy that described signal low frequency energy computing module calculates is the signal spectrum component sum in 0.5-10Hz frequency range.
In system of the present invention, described fiber-optic grating sensor is connected on a vibration optical cable, and vibration optical cable is that line style is laid.
In system of the present invention, described in the fiber-optic grating sensor that closes on be first three and rear three sensors of the sensor meeting the threshold of sensitivity trigger condition pre-set.
The beneficial effect that the present invention produces is: the present invention is by calculating fiber grating sensor wavelength change of error amount, when it meets the threshold of sensitivity trigger condition pre-set, choose the time dependent data sequence of wavelength offset of predetermined time period, and calculate the signal low frequency energy of this section of time inner fiber grating sensor; And calculate the low frequency energy of the fiber-optic grating sensor closed on, comparing, select the fiber-optic grating sensor with maximum low frequency energy, is invasion address by the location recognition of this fiber-optic grating sensor, to report to the police.Achieve the technical requirement that quasi-distributed fiber grating perimeter security system is not failed to report, reported by mistake less, when ensure that system is run under high sensitivity condition, an an intrusion behavior only sensor output alarm, improve the addressing precision to intrusion behavior, the environmental suitability of system is strengthened, facilitates the marketing of fiber grating circumference intrusion alarm system.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the addressing method process flow diagram of the quasi-distributed fiber grating circumference intrusion alarm system of the embodiment of the present invention;
Fig. 2 is the embodiment of the present invention carries out simulating approaching sensor when crossing signal energy distribution schematic diagram in the position that sensor number is 5;
Fig. 3 is that laying structure schematic diagram installed by embodiment of the present invention tube-through type optical fiber raster vibration optical cable;
Fig. 4 is the structural representation of the addressing system of the quasi-distributed fiber grating circumference intrusion alarm system of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The present invention can realize the technical requirement that quasi-distributed fiber grating perimeter security system is not failed to report, reported by mistake less, when ensure that system is run under high sensitivity condition, an an intrusion behavior only sensor output alarm, improve the addressing precision to intrusion behavior, the environmental suitability of system is strengthened, facilitates the marketing of fiber grating circumference intrusion alarm system.
As shown in Figure 1, the addressing method of embodiment of the present invention quasi-distributed fiber grating circumference intrusion alarm system, comprises the following steps:
S101, obtain the real-time wavelength data message of each fiber-optic grating sensor;
S102, calculate fiber grating sensor wavelength reference value according to real-time wavelength data message, and the impact that deduction temperature drift effect is extracted vibration signal;
S103 calculates fiber grating sensor wavelength change of error amount according to wavelength reference;
S104, judge that whether this wavelength offset variable quantity meets the threshold of sensitivity trigger condition pre-set;
If S105 wavelength offset variable quantity meets the threshold of sensitivity trigger condition pre-set, then choose the time dependent data sequence of wavelength offset of predetermined time period, and calculate the signal low frequency energy of this section of time inner fiber grating sensor; In one embodiment of the invention, low frequency energy is the signal spectrum component sum in 0.5-10Hz frequency range.
The low frequency energy of the fiber-optic grating sensor that S106, calculating close on, and compare;
S107, selecting the fiber-optic grating sensor with maximum low frequency energy, is invasion address by the location recognition of this fiber-optic grating sensor, to report to the police.In a preferred embodiment of the present invention, the fiber-optic grating sensor closed on is first three individual and rear three sensor of the sensor meeting the threshold of sensitivity trigger condition pre-set.
Further, in one embodiment of the present of invention, fiber-optic grating sensor is connected on a vibration optical cable, and vibration optical cable is that line style is laid.
Multiple optical fibre grating acceleration sensors of serial connection can be utilized in the embodiment of the present invention to carry out spatial sampling to identify the appearance position of intrusion behavior to the conduction of the signal energy of crossing intrusion behavior with once climbing in steel pipe support structure and distribution, make multiple sensors of anti-intrusion system under higher sensitivity parameter condition, find out the strongest position of excitation energy accurately, thus addressing is carried out to intrusion behavior.Avoid when high sensitivity threshold parameter is arranged, the situation with an equal output alarm state of the multiple sensor of intrusion behavior occurs, the reliability that raising system identifies invasion position and judges.The spatial characteristics of signal energy feature for the energy value of the vibration signal that sensor that: distance invasion position is nearest obtains maximum, along with the conduction of mechanical vibration in elasticity medium, the signal intensity that the sensor of adjacent locations is experienced weakens gradually, until signal thoroughly dissipates.Without signal during invasion, then not possess energy when vibration signal transmits in elasticity medium be the rule of attenuation type space distribution, and the space distribution of signal energy when having an invasion is unimodal function distributions.As shown in Figure 2, simulation invasion is carried out when crossing excitation No. five sensor proximity position, spatial sampling is carried out in the conduction behavior of six sensors to the vibrational energy of the behavior closed on, No. five energy value that sensor obtains is maximum, the sensor of its both sides is along with the increase apart from driving source space length, and the energy that disturbing signal experienced by sensor successively decreases successively.According to this method, first extract multiple sensor time become the low frequency energy of wavelength signals, comparing the size of each energy values, then providing with sensor sequence number for horizontal ordinate, signal energy value is the curve map of ordinate, namely can judge to invade position.
As shown in Figure 3, the circumference intrusion alarm pick-up unit that the specific embodiment of the invention adopts, the detection front end being arranged on circumference scene is made up of four parts: be erected at the support 1 on body of wall, welded tube 2, welded tube connection sleeve pipe 3 and the armouring be connected in series by optical fibre grating acceleration sensor vibrate optical cable 4(mono-vibration optical cable and are connected in series 20 sensors, transducer spacing is at 6 ~ 12 meters), vibration time invaded for perception circumference or strain signal; Fiber Bragg grating (FBG) demodulator is adopted to carry out demodulation to sensor signal, then by time signal transacting main frame (maybe can realize the system of said method) pair become fiber-optic grating sensor time become wavelength signals process in real time, determine whether and invade and carry out sound and light alarm, provide and show intrusion detection and positioning result thereof.
What enumerate in the embodiment of the present invention is the specific implementation method of circumference intrusion alarm system based on concatenation type optical fibre grating acceleration sensor, and addressing method of the present invention can be applied in the periphery intrusion preventing alarm system based on the optics of other types, electric class or hybrid quasi-distributed acceleration transducer or array of pressure sensors completely.
The addressing system of the quasi-distributed fiber grating circumference intrusion alarm system of the embodiment of the present invention, for realizing said method, as shown in Figure 4, comprising:
Real-time wavelength data message acquisition module 10, for obtaining the real-time wavelength data message of each fiber-optic grating sensor;
Wavelength reference computing module 20, for calculating fiber grating sensor wavelength reference value according to real-time wavelength data message, and the impact that deduction temperature drift effect is extracted vibration signal;
Wavelength offset variable quantity computing module 30, for calculating fiber grating sensor wavelength change of error amount according to wavelength reference;
Judge module 40, for judging whether wavelength offset variable quantity meets the threshold of sensitivity trigger condition pre-set;
Signal low frequency energy computing module 50, for when wavelength offset variable quantity meets the threshold of sensitivity trigger condition pre-set, choose the time dependent data sequence of wavelength offset of predetermined time period, and calculate the signal low frequency energy of this section of time inner fiber grating sensor; And calculate the low frequency energy of the fiber-optic grating sensor closed on; In a preferred embodiment of the present invention, the fiber-optic grating sensor closed on is first three individual and rear three sensor of the sensor meeting the threshold of sensitivity trigger condition pre-set.
Addressing module 60, for comparing the low frequency energy of the fiber-optic grating sensor closed on, selects the fiber-optic grating sensor with maximum low frequency energy, is invasion address, to report to the police by the location recognition of this fiber-optic grating sensor.
In the embodiment of the present invention, the low frequency energy that signal low frequency energy computing module calculates is the signal spectrum component sum in 0.5-10Hz frequency range.
In embodiments of the invention, fiber-optic grating sensor is connected on a vibration optical cable, and vibration optical cable is that line style is laid.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (8)
1. an addressing method for quasi-distributed fiber grating circumference intrusion alarm system, is characterized in that, comprises the following steps:
Obtain the real-time wavelength data message of each fiber-optic grating sensor;
Fiber grating sensor wavelength reference value is calculated according to described real-time wavelength data message, and the impact that deduction temperature drift effect is extracted vibration signal;
Calculate fiber grating sensor wavelength change of error amount according to described wavelength reference, and judge whether this wavelength offset variable quantity meets the threshold of sensitivity trigger condition pre-set;
If wavelength offset variable quantity meets the threshold of sensitivity trigger condition pre-set, then choose the time dependent data sequence of wavelength offset of predetermined time period, and calculate the signal low frequency energy of this section of time inner fiber grating sensor;
Calculating the low frequency energy of the fiber-optic grating sensor closed on, and compare, select the fiber-optic grating sensor with maximum low frequency energy, is invasion address by the location recognition of this fiber-optic grating sensor, to report to the police.
2. method according to claim 1, is characterized in that, described low frequency energy is the signal spectrum component sum in 0.5-10Hz frequency range.
3. method according to claim 1, is characterized in that, described fiber-optic grating sensor is connected on a vibration optical cable, and vibration optical cable is that line style is laid.
4. method according to claim 3, is characterized in that, described in the fiber-optic grating sensor that closes on be first three and rear three sensors of the sensor meeting the threshold of sensitivity trigger condition pre-set.
5. an addressing system for quasi-distributed fiber grating circumference intrusion alarm system, is characterized in that, comprising:
Real-time wavelength data message acquisition module, for obtaining the real-time wavelength data message of each fiber-optic grating sensor;
Wavelength reference computing module, for calculating fiber grating sensor wavelength reference value according to described real-time wavelength data message, and the impact that deduction temperature drift effect is extracted vibration signal;
Wavelength offset variable quantity computing module, for calculating fiber grating sensor wavelength change of error amount according to described wavelength reference;
Judge module, for judging whether wavelength offset variable quantity meets the threshold of sensitivity trigger condition pre-set;
Signal low frequency energy computing module, for when wavelength offset variable quantity meets the threshold of sensitivity trigger condition pre-set, choose the time dependent data sequence of wavelength offset of predetermined time period, and calculate the signal low frequency energy of this section of time inner fiber grating sensor; And calculate the low frequency energy of the fiber-optic grating sensor closed on;
Addressing module, for comparing the low frequency energy of the fiber-optic grating sensor closed on, selects the fiber-optic grating sensor with maximum low frequency energy, is invasion address, to report to the police by the location recognition of this fiber-optic grating sensor.
6. system according to claim 5, is characterized in that, the low frequency energy that described signal low frequency energy computing module calculates is the signal spectrum component sum in 0.5-10Hz frequency range.
7. system according to claim 5, is characterized in that, described fiber-optic grating sensor is connected on a vibration optical cable, and vibration optical cable is that line style is laid.
8. system according to claim 7, is characterized in that, described in the fiber-optic grating sensor that closes on be first three and rear three sensors of the sensor meeting the threshold of sensitivity trigger condition pre-set.
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| CN104794839B (en) * | 2015-04-27 | 2017-03-01 | 武汉世纪金桥安全技术有限公司 | One kind is based on POTDR fiber optic intrusion recognizer |
| CN106228719A (en) * | 2016-08-22 | 2016-12-14 | 上海波汇科技股份有限公司 | A kind of perimeter intrusion detecting system based on Fibre Optical Sensor |
| CN107886661B (en) * | 2017-11-10 | 2019-04-23 | 中国电子科技集团公司第四十一研究所 | A kind of intrusion event determination method based on vibrational energy accumulation |
| CN111341049B (en) * | 2020-03-31 | 2021-04-20 | 华中科技大学 | Tunnel foreign matter invasion identification and positioning method and device |
| CN112268608A (en) * | 2020-10-13 | 2021-01-26 | 中国南方电网有限责任公司超高压输电公司贵阳局 | High-precision demodulation algorithm for strong interference DVS |
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