CN109813348A - A kind of distributed optical fiber sensing system and its control method - Google Patents
A kind of distributed optical fiber sensing system and its control method Download PDFInfo
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Abstract
The present invention relates to a kind of distributed optical fiber sensing system and its control method, the system comprises: high-speed a/d parallel acquisition unit, digital down converter, parallel cumulative mean device unit and signal extraction and computing unit；The high-speed a/d parallel acquisition unit, digital down converter, parallel cumulative mean device unit and signal extraction and computing unit are sequentially connected.Technical solution provided by the invention, reduce the various noise jammings that multiple external function modules introduce in traditional scheme, the integrated level for increasing system substantially reduces the time of signal analysis, to improve the Stability and dependability of distributed optical fiber sensing system.
Description
Technical field
The present invention relates to Distributed Optical Fiber Sensing Techniques fields, and in particular to a kind of distributed optical fiber sensing system and its control
Method processed.
Background technique
Optical fiber acts not only as the transmission medium of light wave, and when light wave is propagated in a fiber, characterizes the spy of light wave
Parameter (amplitude, phase, polarization state, wavelength etc.) is levied because of the effect of extraneous factor (such as temperature, pressure, magnetic field, electric field, displacement)
And cither indirectly or directly change, so as to which optical fiber is detected various (physical quantitys, chemical quantity to be measured as sensing element
With biomass etc.), here it is the basic principles of fibre optical sensor.
Modern information technologies are made of the acquisition, transmission and processing technique of information, therefore sensor, communication and computer
Technology becomes three big pillars of information technology.Especially today's society has entered the information using Fibre Optical Communication Technology as main feature
Epoch, optical fiber sensing technology represent the development trend of new generation sensor.
According to measurement method difference, fibre optical sensor is divided into two kinds of point type and distribution.Distributed fiberoptic sensor has
The ability for extracting the distributed intelligence of large-range measuring field, is able to solve numerous problems of current fields of measurement.Wherein distributed light
Fine temperature sensor can be used for the temperature of the big or long equipment of such as large-scale power transformer, high-tension network, skyscraper
Distribution measuring and monitoring.It is real-time, steady with deepening continuously for the Distributed Optical Fiber Sensing Techniques research based on Brillouin scattering
Qualitative, good reliability and high-precision distributed sensing system will obtain bigger development.
Current Distributed Optical Fiber Sensing Techniques, the one-shot measurement time is longer, if whole channels are swept in multi-channel system
Retouching one time period will be longer, will produce bigger effect to the real-time of sensor-based system in this way；Further, since signal processing
Module is built using discrete component, and introduces additional scan module, can be introduced to entire digital signal processing channel
External noise, to make what faint reflection signal originally became to be more difficult identification and judge.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is by utilizing high-speed a/d parallel acquisition unit, the lower change of number
Frequency device, parallel cumulative mean device unit, signal extraction and computing unit and control unit construct distributed optical fiber sensing system, subtract
The various noise jammings that multiple external function modules introduce in traditional scheme are lacked, have increased the integrated level of system, greatly shorten
The time of signal analysis, to improve the Stability and dependability of distributed optical fiber sensing system.
The purpose of the present invention is adopt the following technical solutions realization:
A kind of distributed optical fiber sensing system, it is improved in that the system comprises: high-speed a/d parallel acquisition list
Member, digital down converter, parallel cumulative mean device unit and signal extraction and computing unit；
The high-speed a/d parallel acquisition unit, digital down converter, parallel cumulative mean device unit and signal extraction and meter
Unit is calculated to be sequentially connected；
The high-speed a/d parallel acquisition unit, for received analog electrical signal to be converted into the number of 4 tunnel outs of phase
Signal, by the digital signal of 4 tunnel out of phase by phase sequential combination at a serial samples stream, and by the serial
Sample stream is exported to the digital down converter；
The digital down converter, for changing the circulation of received serial samples into multiple parallel baseband digital signals,
And the multiple parallel baseband digital signal is exported to the parallel cumulative mean device unit；
The parallel cumulative mean device unit, for obtaining each base in the multiple parallel baseband digital signal respectively
Average value with digital signal, and the average value of each baseband digital signal in the multiple parallel baseband digital signal is defeated
Out to signal extraction and computing unit；
The signal extraction and computing unit, for each base-band digital in the multiple parallel baseband digital signal
The average value of signal carries out Fast Fourier Transform (FFT), obtains each baseband digital signal in the multiple parallel baseband digital signal
Average value frequency spectrum, and the frequency spectrum of the average value of each baseband digital signal in the multiple parallel baseband digital signal is intended
Synthesize Lorentz curve.
Preferably, the high-speed a/d parallel acquisition unit, comprising: when amplifying circuit, four ADC chips in parallel, number
Clock management module and A/D sampled value buffer area；
The amplifying circuit, for the analog electrical signal that photodetector provides to be amplified and is filtered, and will amplification
Four parallel ADC chips are respectively transmitted to filtered analog electrical signal；
The digital dock management module, for be respectively four ADC chips in parallel provide 0 degree of phase clock signal,
90 degree of phase clock signals, 180 degree phase clock signal and 270 degree of phase clock signals；
Phase is the amplification and filtering of x degree if the phase for received clock signal is x degree by the ADC chip
Analog electrical signal afterwards is converted to digital signal, wherein x 0,90,180 or 270；
A/D sampled value buffer area, for be 0 degree by phase, 90 degree, 180 degree and 270 degree of digital signal be by phase
Sequential combination is exported at a serial samples stream, and by the serial samples stream to the digital down converter.
Further, the sample rate and resolution ratio of the ADC chip are respectively 250MSPS and 16bit；
The model AD9467-250 or AD9652 of the ADC chip；
The digital dock management module is PLL the or DCM unit inside Xilinx FPGA.
Preferably, the parallel cumulative mean device unit is composed in parallel by m cumulative mean device.
Further, the digital down converter, is used for:
Mixing operations, FIR filtering operation and extract operation are successively carried out to received serial samples stream, obtain m parallel
Baseband digital signal, and the m parallel baseband digital signals are exported respectively to the parallel cumulative mean device unit
Middle m parallel cumulative mean devices, wherein m is positive integer and m > 1.
Specifically, the signal extraction and computing unit, comprising: m FFT time-frequency conversion module and Lorentz curve fitting
And analysis module；
The FFT time-frequency conversion module, for 1 baseband digital signal in the m parallel baseband digital signal
Average value carry out Fast Fourier Transform (FFT), obtain the frequency spectrum of the average value of the baseband digital signal；
The Lorentz curve fitting and analysis module, are used for each base-band digital in m parallel baseband digital signal
The Spectrum Fitting of the average value of signal is at Lorentz curve.
Specifically, the FFT time-frequency conversion module is the FFT IP CORE of Xilinx FPGA；
The execution logic of the Lorentz curve fitting and analytical unit is write using VHDL or Verilog language.
Preferably, the system, further includes: control unit；
Described control unit respectively with the high-speed a/d parallel acquisition unit, digital down converter, parallel cumulative mean device
Unit and signal extraction are connect with computing unit；
Described control unit, for controlling high-speed a/d parallel acquisition unit, digital down converter, parallel cumulative mean device
Unit and signal extraction and computing unit execute sequence.
Further, described control unit is specifically used for:
When high-speed a/d parallel acquisition unit receives analog electrical signal, control high-speed a/d parallel acquisition unit will be received
Analog electrical signal be converted into the digital signals of 4 tunnel outs of phase, the digital signal of 4 tunnel out of phase is pressed into phase bit timing
It is combined into a serial samples stream, and the serial samples stream is exported to the digital down converter；
When digital down converter receives serial samples stream, received sample streams are converted by control digital down converter
Multiple parallel baseband digital signals, and the multiple parallel baseband digital signal is exported to the parallel cumulative mean device
Unit；
When parallel cumulative mean device unit receives multiple parallel baseband digital signals, parallel cumulative mean device is controlled
Unit obtains the average value of each baseband digital signal in the multiple parallel baseband digital signal respectively, and will be the multiple
The average value of each baseband digital signal is exported to signal extraction and computing unit in parallel baseband digital signal；
Believe when the signal extraction and computing unit receive each base-band digital in multiple parallel baseband digital signals
Number average value when, control signal extraction and computing unit to each base-band digital in the multiple parallel baseband digital signal
The average value of signal carries out Fast Fourier Transform (FFT), obtains each baseband digital signal in the multiple parallel baseband digital signal
Average value frequency spectrum, and the frequency spectrum of the average value of each baseband digital signal in the multiple parallel baseband digital signal is intended
Synthesize Lorentz curve.
A kind of control method of distributed optical fiber sensing system, it is improved in that the described method includes:
S1. the number of iterations n=0, n ∈ [1, N] are initialized；
S2. control unit controls high-speed a/d parallel acquisition unit and received analog electrical signal is converted into 4 tunnel outs of phase
Digital signal, by the digital signal of 4 tunnel out of phase by phase sequential combination at a serial samples stream, and will be described
Serial samples stream is exported to the digital down converter；
S3. control unit control digital down converter successively carries out mixing operations, FIR filter to received serial digital signal
Wave operation and extract operation obtain m parallel baseband digital signals, and the m parallel baseband digital signals are distinguished
M parallel cumulative mean devices are exported into the parallel cumulative mean device unit；
Wherein, m is positive integer and m > 1；
S4. control unit judges whether the number of iterations n is equal to N, if n is equal to N, thens follow the steps S5；If n is not equal to N,
N=n+1 is enabled, and executes step S2；
S5. control unit controls parallel cumulative mean device unit and is obtained in the m parallel baseband digital signals respectively
The average value of each baseband digital signal, and by the m parallel baseband digital signals each baseband digital signal it is flat
Mean value is exported to signal extraction and computing unit；
S6. control unit control signal extraction and computing unit are to each base in the m parallel baseband digital signals
Average value with digital signal carries out Fast Fourier Transform (FFT), obtains each base band number in the m parallel baseband digital signal
The frequency spectrum of the average value of word signal, and by the average value of each baseband digital signal in the m parallel baseband digital signal
Spectrum Fitting is at Lorentz curve.
Compared with the immediate prior art, the invention has the benefit that
Technical solution provided by the invention is put down by high-speed a/d parallel acquisition unit, digital down converter, parallel add up
Equal device unit, signal extraction and computing unit and control unit construct distributed optical fiber sensing system, reduce in traditional scheme
The various noise jammings that multiple external function modules introduce, increase the integrated level of system, substantially reduce signal analysis when
Between, to improve the Stability and dependability of distributed optical fiber sensing system；
Technical solution provided by the invention can be right by using high-speed a/d parallel acquisition unit and digital down converter
The signal of m frequency range can carry out parallel processing after one acquisition, the original processing time be shorten to 1/m, to contract significantly
The short signal extraction time.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of distributed optical fiber sensing system in the embodiment of the present invention；
Fig. 2 is a kind of distributed optical fiber sensing system high speed A/D parallel acquisition unit in the embodiment of the present invention, parallel tired
Add the structural schematic diagram of averager unit and signal extraction and computing unit；
Fig. 3 is putting in a kind of high-speed a/d parallel acquisition unit of distributed optical fiber sensing system in the embodiment of the present invention
The structural schematic diagram of big circuit；
Fig. 4 is the A/D in the embodiment of the present invention in a kind of high-speed a/d parallel acquisition unit of distributed optical fiber sensing system
The working principle diagram of sampled value buffer area；
Fig. 5 is a kind of structural schematic diagram of digital down converter in distributed optical fiber sensing system in the embodiment of the present invention；
Fig. 6 is a kind of another structural schematic diagram of distributed optical fiber sensing system in the embodiment of the present invention；
Fig. 7 is a kind of flow diagram of the control method of distributed optical fiber sensing system in the embodiment of the present invention.
Specific embodiment
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention provides a kind of distributed optical fiber sensing systems, as shown in Figure 1, the system comprises: high-speed a/d is parallel
Acquisition unit, digital down converter, parallel cumulative mean device unit and signal extraction and computing unit；
The high-speed a/d parallel acquisition unit, digital down converter, parallel cumulative mean device unit and signal extraction and meter
Unit is calculated to be sequentially connected；
The high-speed a/d parallel acquisition unit, for received analog electrical signal to be converted into the number of 4 tunnel outs of phase
Signal, by the digital signal of 4 tunnel out of phase by phase sequential combination at a serial samples stream, and by the serial
Sample stream is exported to the digital down converter；
The digital down converter, for changing the circulation of received serial samples into multiple parallel baseband digital signals,
And the multiple parallel baseband digital signal is exported to the parallel cumulative mean device unit；
The parallel cumulative mean device unit, for obtaining each base in the multiple parallel baseband digital signal respectively
Average value with digital signal, and the average value of each baseband digital signal in the multiple parallel baseband digital signal is defeated
Out to signal extraction and computing unit；
The signal extraction and computing unit, for each base-band digital in the multiple parallel baseband digital signal
The average value of signal carries out Fast Fourier Transform (FFT), obtains each baseband digital signal in the multiple parallel baseband digital signal
Average value frequency spectrum, and the frequency spectrum of the average value of each baseband digital signal in the multiple parallel baseband digital signal is intended
Synthesize Lorentz curve.
Further, as shown in Fig. 2, the high-speed a/d parallel acquisition unit, comprising: amplifying circuit, four it is in parallel
ADC chip, digital dock management module and A/D sampled value buffer area；
The amplifying circuit, for the analog electrical signal that photodetector provides to be amplified and is filtered, and will amplification
Four parallel ADC chips are respectively transmitted to filtered analog electrical signal, for example, as shown in Figure 3；
The digital dock management module, for be respectively four ADC chips in parallel provide 0 degree of phase clock signal,
90 degree of phase clock signals, 180 degree phase clock signal and 270 degree of phase clock signals；
Phase is the amplification and filtering of x degree if the phase for received clock signal is x degree by the ADC chip
Analog electrical signal afterwards is converted to digital signal, wherein x 0,90,180 or 270；
A/D sampled value buffer area, for be 0 degree by phase, 90 degree, 180 degree and 270 degree of digital signal be by phase
Sequential combination is exported at a serial samples stream, and by the serial samples stream to the digital down converter；For example, such as Fig. 4
It is shown.
Specifically, the sample rate and resolution ratio of the ADC chip are respectively 250MSPS and 16bit；
The model AD9467-250 or AD9652 of the ADC chip；
The digital dock management module is PLL the or DCM unit inside Xilinx FPGA.
Further, as shown in Fig. 2, the parallel cumulative mean device unit is composed in parallel by m cumulative mean device.
Further, as shown in figure 5, the digital down converter, is used for:
Mixing operations, FIR filtering operation and extract operation are successively carried out to received serial samples stream, obtain m parallel
Baseband digital signal, and the m parallel baseband digital signals are exported respectively to the parallel cumulative mean device unit
Middle m parallel cumulative mean devices, wherein m is positive integer and m > 1.
Further, as shown in Fig. 2, the signal extraction and computing unit, comprising: m FFT time-frequency conversion module and Lip river
Human relations hereby curve matching and analysis module；
The FFT time-frequency conversion module, for 1 baseband digital signal in the m parallel baseband digital signal
Average value carry out Fast Fourier Transform (FFT), obtain the frequency spectrum of the average value of the baseband digital signal；
The Lorentz curve fitting and analysis module, are used for each base-band digital in m parallel baseband digital signal
The Spectrum Fitting of the average value of signal is at Lorentz curve.
Specifically, the FFT time-frequency conversion module is the FFT IP CORE of Xilinx FPGA；
The execution logic of the Lorentz curve fitting and analytical unit is write using VHDL or Verilog language.
Preferably, as shown in fig. 6, the system, further includes: control unit；
Described control unit respectively with the high-speed a/d parallel acquisition unit, digital down converter, parallel cumulative mean device
Unit and signal extraction are connect with computing unit；
Described control unit, for controlling high-speed a/d parallel acquisition unit, digital down converter, parallel cumulative mean device
Unit and signal extraction and computing unit execute sequence.
Further, described control unit is specifically used for:
When high-speed a/d parallel acquisition unit receives analog electrical signal, control high-speed a/d parallel acquisition unit will be received
Analog electrical signal be converted into the digital signals of 4 tunnel outs of phase, the digital signal of 4 tunnel out of phase is pressed into phase bit timing
It is combined into a serial samples stream, and the serial samples stream is exported to the digital down converter；
When digital down converter receives serial samples stream, received sample streams are converted by control digital down converter
Multiple parallel baseband digital signals, and the multiple parallel baseband digital signal is exported to the parallel cumulative mean device
Unit；
When parallel cumulative mean device unit receives multiple parallel baseband digital signals, parallel cumulative mean device is controlled
Unit obtains the average value of each baseband digital signal in the multiple parallel baseband digital signal respectively, and will be the multiple
The average value of each baseband digital signal is exported to signal extraction and computing unit in parallel baseband digital signal；
Believe when the signal extraction and computing unit receive each base-band digital in multiple parallel baseband digital signals
Number average value when, control signal extraction and computing unit to each base-band digital in the multiple parallel baseband digital signal
The average value of signal carries out Fast Fourier Transform (FFT), obtains each baseband digital signal in the multiple parallel baseband digital signal
Average value frequency spectrum, and the frequency spectrum of the average value of each baseband digital signal in the multiple parallel baseband digital signal is intended
Synthesize Lorentz curve.
Technical solution provided in this embodiment, by the Brillouin signal detection and processing in traditional BOTDR system
Module improves and optimizes, and introduces one Digital Down Convert of key technology (DDC) technology in software and radio technique, substitution
Traditional scan module can carry out parallel processing after one acquisition to the signal of m frequency range, the original processing time is contracted
Short is 1/m, to substantially reduce the signal extraction time；
In addition, by being introduced into using digital dock management module (DCM) and in DDC module using digital technology
DDS frequency combining method, to reflection signal processing all use digital means, in traditional scheme using simulation addend word
Signal processing mode be optimized, when having that frequency resolution is high, frequency switching time is short and frequency shift, output phase
Position is continuous to wait remarkable advantages.
The present invention also provides a kind of control methods of distributed optical fiber sensing system, as shown in Figure 7, which comprises
101. initializing the number of iterations n=0, n ∈ [1, N]；
102. control unit, which controls high-speed a/d parallel acquisition unit, is converted into 4 tunnel difference phases for received analog electrical signal
The digital signal of position, by the digital signal of 4 tunnel out of phase by phase sequential combination at a serial samples stream, and by institute
Serial samples stream is stated to export to the digital down converter；
103. control unit control digital down converter successively carries out mixing operations, FIR to received serial digital signal
Filtering operation and extract operation obtain m parallel baseband digital signals, and the m parallel baseband digital signals are divided
Cumulative mean device that Shu Chu be m not parallel into the parallel cumulative mean device unit；
Wherein, m is positive integer and m > 1；
104. control unit judges whether the number of iterations n is equal to N, if n is equal to N, 105 are thened follow the steps；If n is not equal to N,
N=n+1 is then enabled, and executes step 102；
105. control unit controls parallel cumulative mean device unit and is obtained in the m parallel baseband digital signals respectively
The average value of each baseband digital signal, and by the m parallel baseband digital signals each baseband digital signal it is flat
Mean value is exported to signal extraction and computing unit；
106. control unit controls signal extraction and computing unit to each base in the m parallel baseband digital signals
Average value with digital signal carries out Fast Fourier Transform (FFT), obtains each base band number in the m parallel baseband digital signal
The frequency spectrum of the average value of word signal, and by the average value of each baseband digital signal in the m parallel baseband digital signal
Spectrum Fitting is at Lorentz curve.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail referring to above-described embodiment for pipe, it should be understood by those ordinary skilled in the art that: still
It can be with modifications or equivalent substitutions are made to specific embodiments of the invention, and without departing from any of spirit and scope of the invention
Modification or equivalent replacement, should all cover within the scope of the claims of the present invention.
Claims (10)
1. a kind of distributed optical fiber sensing system, which is characterized in that the system comprises: high-speed a/d parallel acquisition unit, number
Low-converter, parallel cumulative mean device unit and signal extraction and computing unit member；
The high-speed a/d parallel acquisition unit, digital down converter, parallel cumulative mean device unit and signal extraction and calculating are single
Member is sequentially connected；
The high-speed a/d parallel acquisition unit, the number for received analog electrical signal to be converted into 4 tunnel outs of phase are believed
Number, by the digital signal of 4 tunnel out of phase by phase sequential combination at a serial samples stream, and by the serial samples
Stream is exported to the digital down converter；
The digital down converter, for changing the circulation of received serial samples into multiple parallel baseband digital signals, and will
The multiple parallel baseband digital signal is exported to the parallel cumulative mean device unit；
The parallel cumulative mean device unit, for obtaining each base band number in the multiple parallel baseband digital signal respectively
The average value of word signal, and by the average value of each baseband digital signal in the multiple parallel baseband digital signal export to
Signal extraction and computing unit；
The signal extraction and computing unit, for each baseband digital signal in the multiple parallel baseband digital signal
Average value carry out Fast Fourier Transform (FFT), obtain the flat of each baseband digital signal in the multiple parallel baseband digital signal
The frequency spectrum of mean value, and by the Spectrum Fitting of the average value of each baseband digital signal in the multiple parallel baseband digital signal at
Lorentz curve.
2. the system as claimed in claim 1, which is characterized in that the high-speed a/d parallel acquisition unit, comprising: amplifying circuit,
Four ADC chips in parallel, digital dock management module and A/D sampled value buffer area；
The amplifying circuit, for the analog electrical signal that photodetector provides to be amplified and is filtered, and will amplification and filter
Analog electrical signal after wave is respectively transmitted to four parallel ADC chips；
The digital dock management module, for being respectively that four ADC chips in parallel provide 0 degree of phase clock signal, 90 degree
Phase clock signal, 180 degree phase clock signal and 270 degree of phase clock signals；
Phase is the amplification of x degree and filtered if the phase for received clock signal is x degree by the ADC chip
Analog electrical signal is converted to digital signal, wherein x 0,90,180 or 270；
A/D sampled value buffer area, for be 0 degree by phase, 90 degree, 180 degree and 270 degree of digital signal be by phase bit timing
It is combined into a serial samples stream, and the serial samples stream is exported to the digital down converter.
3. system as claimed in claim 2, which is characterized in that the sample rate and resolution ratio of the ADC chip be respectively
250MSPS and 16bit；
The model AD9467-250 or AD9652 of the ADC chip；
The digital dock management module is PLL the or DCM unit inside Xilinx FPGA.
4. the system as claimed in claim 1, which is characterized in that the parallel cumulative mean device unit is by m cumulative mean device
It composes in parallel.
5. system as claimed in claim 4, which is characterized in that the digital down converter is used for:
Mixing operations, FIR filtering operation and extract operation are successively carried out to received serial samples stream, obtain m parallel bases
Band digital signal, and the m parallel baseband digital signals are exported respectively into the parallel cumulative mean device unit m
Parallel cumulative mean device, wherein m is positive integer and m > 1.
6. system as claimed in claim 5, which is characterized in that the signal extraction and computing unit, comprising: m FFT time-frequency
Conversion module and Lorentz curve fitting and analysis module；
The FFT time-frequency conversion module, for the flat of 1 baseband digital signal in the m parallel baseband digital signal
Mean value carries out Fast Fourier Transform (FFT), obtains the frequency spectrum of the average value of the baseband digital signal；
The Lorentz curve fitting and analysis module, are used for each baseband digital signal in m parallel baseband digital signal
Average value Spectrum Fitting at Lorentz curve.
7. system as claimed in claim 6, which is characterized in that the FFT time-frequency conversion module is the FFT of Xilinx FPGA
IP CORE；
The execution logic of the Lorentz curve fitting and analytical unit is write using VHDL or Verilog language.
8. the system as claimed in claim 1, which is characterized in that the system, further includes: control unit；
Described control unit respectively with the high-speed a/d parallel acquisition unit, digital down converter, parallel cumulative mean device unit
It is connect with signal extraction with computing unit；
Described control unit, for controlling high-speed a/d parallel acquisition unit, digital down converter, parallel cumulative mean device unit
Sequence is executed with signal extraction and computing unit.
9. system as claimed in claim 8, which is characterized in that described control unit is specifically used for:
When high-speed a/d parallel acquisition unit receives analog electrical signal, high-speed a/d parallel acquisition unit is controlled by received mould
Quasi- electric signal is converted into the digital signal of 4 tunnel outs of phase, and the digital signal of 4 tunnel out of phase is pressed phase sequential combination
It exports at a serial samples stream, and by the serial samples stream to the digital down converter；
When digital down converter receives serial samples stream, received sample streams are converted into multiple by control digital down converter
Parallel baseband digital signal, and the multiple parallel baseband digital signal is exported to the parallel cumulative mean device list
Member；
When parallel cumulative mean device unit receives multiple parallel baseband digital signals, parallel cumulative mean device unit is controlled
The average value of each baseband digital signal in the multiple parallel baseband digital signal is obtained respectively, and will be the multiple parallel
Baseband digital signal in the average value of each baseband digital signal export to signal extraction and computing unit；
When the signal extraction and computing unit receive each baseband digital signal in multiple parallel baseband digital signals
When average value, signal extraction and computing unit are controlled to each baseband digital signal in the multiple parallel baseband digital signal
Average value carry out Fast Fourier Transform (FFT), obtain the flat of each baseband digital signal in the multiple parallel baseband digital signal
The frequency spectrum of mean value, and by the Spectrum Fitting of the average value of each baseband digital signal in the multiple parallel baseband digital signal at
Lorentz curve.
10. a kind of control method of such as described in any item distributed optical fiber sensing systems of claim 1-9, which is characterized in that
The described method includes:
S1. the number of iterations n=0, n ∈ [1, N] are initialized；
S2. received analog electrical signal is converted into the number of 4 tunnel outs of phase by control unit control high-speed a/d parallel acquisition unit
Word signal, by the digital signal of 4 tunnel out of phase by phase sequential combination at a serial samples stream, and will be described serial
Sample streams are exported to the digital down converter；
S3. control unit control digital down converter successively carries out mixing operations, FIR filtering fortune to received serial digital signal
Calculation and extract operation obtain m parallel baseband digital signals, and the m parallel baseband digital signals are exported respectively
To m parallel cumulative mean devices in the parallel cumulative mean device unit；
Wherein, m is positive integer and m > 1；
S4. control unit judges whether the number of iterations n is equal to N, if n is equal to N, thens follow the steps S5；If n is not equal to N, n is enabled
=n+1, and execute step S2；
S5. control unit controls parallel cumulative mean device unit and is obtained in the m parallel baseband digital signals respectively each
The average value of baseband digital signal, and by the average value of each baseband digital signal in the m parallel baseband digital signals
It exports to signal extraction and computing unit；
S6. control unit control signal extraction and computing unit are to each base band number in the m parallel baseband digital signals
The average value of word signal carries out Fast Fourier Transform (FFT), obtains each base-band digital letter in the m parallel baseband digital signal
Number average value frequency spectrum, and by the frequency spectrum of the average value of each baseband digital signal in the m parallel baseband digital signal
It is fitted to Lorentz curve.
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| CN201910091098.9A CN109813348B (en) | 2019-01-30 | 2019-01-30 | Distributed optical fiber sensing system and control method thereof |
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