CN109462434A - One kind being based on optical time domain reflectometer sampled-data processing method and device - Google Patents
One kind being based on optical time domain reflectometer sampled-data processing method and device Download PDFInfo
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- CN109462434A CN109462434A CN201811376258.6A CN201811376258A CN109462434A CN 109462434 A CN109462434 A CN 109462434A CN 201811376258 A CN201811376258 A CN 201811376258A CN 109462434 A CN109462434 A CN 109462434A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
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Abstract
The invention discloses a kind of data processing methods based on optical time domain reflectometer sampling, this method comprises: FPGA module obtains the first sampled data；The data of first memory module are merged with first sampled data in the FPGA module；Fused data are sent to the second memory module and obtain the first fused data；The FPGA module obtains the second sampled data and obtains the second fused data after merging with the first fused data of second memory module；Second fused data is sent to first memory module.The present invention improves sample rate, increases the accumulative frequency of unit time, so that higher signal-to-noise ratio is obtained, better OTDR measurement performance.
Description
Technical field
The present invention relates to optical time domain reflectometer sampled data fields, are sampled more particularly to one kind based on optical time domain reflectometer
Data processing method and device.
Background technique
Due to the heterogeneity of optic fibre characteristic defect itself and doping composition, so that the laser propagated in optical fiber occurs backward
Scattering, i.e. a part are difficult to detect the very faint optical signal of processing, and intensity is about the -60dB of incident light hereinafter, along phase
Anti- direction, which is scattered back, to be come, referred to as Rayleigh beacon, and exactly this part back scattering is difficult to detect the very micro- of processing
Weak optical signal, for we provide decaying details related with length.
If injected optical power is P0, then the rear orientation light at z is transferred to along optical fiber and transfers back to the optical power at beginning again and be
Rayleigh beacon principle formula
Wherein, attenuation coefficient when γ f (z), γ b (z) are respectively forward direction, reverse transfers at z, η (z)
The backscattering coefficient for being optical fiber at z, it is related with the structural parameters of rayleigh scattering coefficient and optical fiber.
If z1 can be measured, it is scattered back the optical power come at z2 two, z1 can be acquired, being averaged for preceding reverse transfers is declined between z2
Subtract factor alpha
If optical fiber structure parameter is along axial uniformly (i.e. η (z1)=η (z2)), between z1 and z2 point
Attenuation coefficient can be expressed as
Information with distance dependent is to measure product as obtained from temporal information and issue high speed and precision laser pulse
With the time difference of the very faint rear orientation light received, this time-domain information is converted into distance using refractive index n values
Wherein c is the speed (3 × 108m/s) of light in a vacuum
The present apparatus use technological innovation, algorithm process, can quickly and accurately measure rear orientation light power P (z1),
P (z2), and the ginseng that the minor change of any point optic fibre characteristic on fiber lengths is needed is measured by formula (3) and formula (4)
Number index.
It can be sent out on the boundary (such as at connector, mechanical splice, fracture or optical fiber termination) of two transmission medium of different refractivity
Raw Fresnel reflection, this phenomenon be used to accurately determine the position of the discontinuity point along fiber lengths.The size of reflection depends on
The flatness and refringence of border surface.
According to above-mentioned basic principle, the attenuation of link is measured, it is necessary to carry out to backscatter signal continuous
Processing.According to formula it is found that the signal of back scattering back is more and more weaker with the increase of distance.In order to enhance measurement effect,
Obtain better signal-to-noise ratio, a kind of relatively good method is that the backscatter signal of multiple light pulse adds up.
If accumulative frequency is N, then the decaying of noise is proportional to the square root of N.In the case where other conditions are constant, unit
Time accumulative frequency is more, and signal-to-noise ratio is stronger.When sampling increases to certain frequency, it to be further added by cumulative time of unit time
Number is difficult.It is badly in need of a kind of method, is able to ascend accumulation process speed when high-speed sampling, increases cumulative time of unit time
Number, so that higher signal-to-noise ratio is obtained, better OTDR measurement performance.
Summary of the invention
Technical problem to be solved by the present invention lies in the deficiencies for overcoming the above-mentioned prior art, provide a kind of based on optical time domain
Reflectometer sampled-data processing method, this method comprises:
FPGA module obtains the first sampled data；
The data of first memory module are merged with first sampled data in the FPGA module；
Fused data are sent to the second memory module and obtain the first fused data；
After the FPGA module obtains the second sampled data and merges with the first fused data of second memory module
Obtain the second fused data；
Second fused data is sent to first memory module.
Preferably, first sampled data is the sampled data of first frame, and second sampled data is that the second frame is adopted
Sample data.
Preferably, if the totalframes of sampling is even frame, the sample and stack result of totalframes is stored in the first storage mould
Block；If the totalframes of sampling is odd-numbered frame, the sample and stack result of totalframes is stored in second memory module.
Preferably, it in the storing process of first sampled data and second sampled data or long reads or long
It writes, does not need to toggle.
Preferably, as long as the clock frequency of first memory module is as the sample clock frequency of the sampled data
Or it is higher than and just works normally.
One kind being based on optical time domain reflectometer sampled-data processing device, it is characterised in that: the device includes:
Sampling module obtains the first sampled data for FPGA module；
First Fusion Module, for the first memory module data and first sampled data the FPGA module into
Row, which merges and fused data are sent to the second memory module, obtains the first fused data；
Second Fusion Module, the FPGA module obtain the second sampled data and melt with the first of second memory module
The second fused data is obtained after closing data fusion；
Sending module, for second fused data to be sent to first memory module.
Preferably, first sampled data is the sampled data of first frame, and second sampled data is that the second frame is adopted
Sample data.
Preferably, if the totalframes of sampling is even frame, the sample and stack result of totalframes is stored in the first storage mould
Block；If the totalframes of sampling is odd-numbered frame, the sample and stack result of totalframes is stored in second memory module.
Preferably, it in the storing process of first sampled data and second sampled data or long reads or long
It writes, does not need to toggle.
Preferably, as long as the clock frequency of first memory module is as the sample clock frequency of the sampled data
Or it is higher than and just works normally.
According to provided by the invention a kind of based on optical time domain reflectometer sampled-data processing method and device and the prior art
Sample rate is improved compared to having, increases the accumulative frequency of unit time, to obtain higher signal-to-noise ratio, reduces number
The interference of circuit, better OTDR measurement performance.
Detailed description of the invention
Fig. 1 is work flow diagram of the invention,
Fig. 2 is structure chart of the invention.
Specific embodiment
Clearly to illustrate the scheme in the present invention, preferred embodiment is given below and being described with reference to the accompanying drawings.With
Under explanation be substantially only exemplary and be not intended to limitation the disclosure application or purposes.It should be understood that
In whole attached drawings, corresponding appended drawing reference indicates identical or corresponding component and feature.
As shown in Figure 1.One kind being based on optical time domain reflectometer sampled-data processing method, this method comprises:
S101, FPGA module obtain the first sampled data；CPU processor controls sampled data and passes through AD D/A converter module
It is converted.
S102, the data of the first memory module are merged with first sampled data in the FPGA module；First
Sampled data is the sampled data of first frame.First memory module is the synchronous SRAM of 256*32.
S103, fused data are sent to the second memory module and obtain the first fused data；Second memory module is
256*32 synchronizes SRAM.
S104, the FPGA module obtain the second sampled data and melt with the first fused data of second memory module
The second fused data is obtained after conjunction；Second sampled data is the second frame sampling data.First sampled data and second sampling
In the storing process of data or length is read or length is write, and does not need to toggle.If the totalframes of sampling is even frame, always
The sample and stack result of frame number is stored in the first memory module；If the totalframes of sampling is odd-numbered frame, the sampling of totalframes is folded
Result is added to be stored in second memory module.
Second fused data is sent to first memory module by S105.
As long as the sample clock frequency of the clock frequency of the first memory module and the second memory module and the sampled data
Equally or slightly above just work normally.
OTDR (optical time domain reflectometer) is fiber optic network construction, checks and accepts, equipment indispensable in routine maintenance procedure.Its
Performance indicator (dynamic range, measurement blind area) and measuring speed are the important indicators of weighing device class.
In sampling process, while accumulation operations repeatedly are carried out to internal storage data.It is interior when sampling reaches given pace
Depositing speed will not catch up with；The present apparatus can solve this problem, promote one times of speed.
Simultaneous switching noise is reduced, the circuit of present apparatus sampling reduces digital circuit to mould from principle and actual effect
The interference of quasi- circuit.
As shown in Fig. 2, a kind of be based on optical time domain reflectometer sampled-data processing device, it is characterised in that: the device includes:
Sampling module 201 obtains the first sampled data for FPGA module；
First Fusion Module 202, for the data of the first memory module and first sampled data in the FPGA mould
Block carries out fusion and fused data is sent to the second memory module the first fused data of acquisition；First sampled data is
The sampled data of first frame.
Second Fusion Module 203, the FPGA module obtain the second sampled data and with second memory module the
The second fused data is obtained after the fusion of one fused data；Second sampled data is the second frame sampling data.
Sending module 204, for second fused data to be sent to first memory module.
If the totalframes of sampling is even frame, the sample and stack result of totalframes is stored in the second memory module.
It in the storing process of first sampled data and second sampled data or reads or writes, do not need to carry out switchback
It changes.
As long as the clock frequency of the first memory module is as the sample clock frequency of the sampled data or slightly above
With regard to working normally.
In conclusion above said content is only the embodiment of the present invention, it is merely to illustrate the principle of the present invention, is not used
In limiting the scope of protection of the present invention.All within the spirits and principles of the present invention, made any modification, equivalent replacement, change
Into etc., it should all be included in the protection scope of the present invention.
Claims (10)
1. one kind is based on optical time domain reflectometer sampled-data processing method, which is characterized in that this method comprises:
FPGA module obtains the first sampled data；
The data of first memory module are merged with first sampled data in the FPGA module；
Fused data are sent to the second memory module and obtain the first fused data；
The FPGA module obtains the second sampled data and obtains after merging with the first fused data of second memory module
Second fused data；
Second fused data is sent to first memory module.
2. being based on optical time domain reflectometer sampled-data processing method as described in claim 1, it is characterised in that: described first adopts
Sample data are the sampled data of first frame, and second sampled data is the second frame sampling data.
3. being based on optical time domain reflectometer sampled-data processing method as claimed in claim 2, it is characterised in that: if sampling
Totalframes is even frame, then the sample and stack result of totalframes is stored in first memory module；If the totalframes of sampling is
Odd-numbered frame, then the sample and stack result of totalframes is stored in second memory module.
4. being based on optical time domain reflectometer sampled-data processing method as described in claim 1, it is characterised in that: described first adopts
In the storing process of sample data and second sampled data or length is read or length is write, and does not need to toggle.
5. being based on optical time domain reflectometer sampled-data processing method as described in claim 1, it is characterised in that: described first deposits
The clock frequency for storing up module is worked normally as long as the sample clock frequency of the sampled data or as long as being higher than.
6. one kind is based on optical time domain reflectometer sampled-data processing device, it is characterised in that:
The device includes:
Sampling module obtains the first sampled data for FPGA module；
First Fusion Module, the data for the first memory module are melted with first sampled data in the FPGA module
Merge and fused data are sent to the second memory module and obtains the first fused data；
Second Fusion Module, the FPGA module obtain the second sampled data and merge number with the first of second memory module
According to obtaining the second fused data after fusion；
Sending module, for first fused data or the second fused data to be sent to processing and the storage mould in later period
Block.
7. being based on optical time domain reflectometer sampled-data processing device as claimed in claim 6, it is characterised in that: described first adopts
Sample data are the sampled data of first frame, and second sampled data is the second frame sampling data.
8. being based on optical time domain reflectometer sampled-data processing device as claimed in claim 7, it is characterised in that: if sampling
Totalframes is even frame, then the sample and stack result of totalframes is stored in first memory module；If the totalframes of sampling is
Odd-numbered frame, then the sample and stack result of totalframes is stored in second memory module.
9. being based on optical time domain reflectometer sampled-data processing device as claimed in claim 6, it is characterised in that: described first adopts
In the storing process of sample data and second sampled data or length is read or length is write, and does not need to toggle.
10. being based on optical time domain reflectometer sampled-data processing device as claimed in claim 6, it is characterised in that: described first
The clock frequency of memory module is worked normally as long as the sample clock frequency of the sampled data or as long as being higher than.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116540208A (en) * | 2023-07-07 | 2023-08-04 | 深圳深浦电气有限公司 | Data processing method, device, equipment and storage medium |
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| CN101577025A (en) * | 2009-06-15 | 2009-11-11 | 上海华魏光纤传感技术有限公司 | Novel data acquisition accumulator and implementation method thereof |
| CN106909114A (en) * | 2017-05-04 | 2017-06-30 | 南昌航空大学 | A kind of SDRAM distributing optical fiber sensings data acquisition based on FPGA, storage and processing system |
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2018
- 2018-11-19 CN CN201811376258.6A patent/CN109462434A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101577025A (en) * | 2009-06-15 | 2009-11-11 | 上海华魏光纤传感技术有限公司 | Novel data acquisition accumulator and implementation method thereof |
| CN106909114A (en) * | 2017-05-04 | 2017-06-30 | 南昌航空大学 | A kind of SDRAM distributing optical fiber sensings data acquisition based on FPGA, storage and processing system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116540208A (en) * | 2023-07-07 | 2023-08-04 | 深圳深浦电气有限公司 | Data processing method, device, equipment and storage medium |
| CN116540208B (en) * | 2023-07-07 | 2023-10-13 | 深圳深浦电气有限公司 | Data processing method, device, equipment and storage medium |
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