CN108270487B - Fibre-optic transmission system (FOTS) based on ultrashort wave radio set - Google Patents
Fibre-optic transmission system (FOTS) based on ultrashort wave radio set Download PDFInfo
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- CN108270487B CN108270487B CN201711311527.6A CN201711311527A CN108270487B CN 108270487 B CN108270487 B CN 108270487B CN 201711311527 A CN201711311527 A CN 201711311527A CN 108270487 B CN108270487 B CN 108270487B
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
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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
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0008—Synchronisation information channels, e.g. clock distribution lines
- H04L7/0012—Synchronisation information channels, e.g. clock distribution lines by comparing receiver clock with transmitter clock
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Abstract
The present invention relates to a kind of fibre-optic transmission system (FOTS)s based on ultrashort wave radio set, comprising: proximal end host, distal end power amplifier and bridges at optical fiber transmission assembly between the two, forms transmitting path and receiving path.The present invention have no need to change ultrashort wave radio set original structure, do not depend on hardware platform performance, realize it is simple and quick.Proximal end host samples ultrashort wave radio set intermediate frequency information, is handled and sent with frequency word information composition data frame by photoelectric converter；Radio station will be returned to by analog-digital converter after the photosignal received parsing data frame.It is sent with control signal composition data frame by photoelectric converter after the radio-frequency information processing that distal end power amplifier receives antenna；Intermediate frequency information will be generated by digital frequency synthesizer after the photosignal received parsing data frame, radio-frequency module processing is transferred to send.The present invention is based on the realizations of Xilinx FPGA processor, meet design requirement with less resource and higher processing speed.
Description
Technical field
The present invention relates to Ultra-short Wave Communication Technique fields, and in particular, to a kind of optical fiber transmission based on ultrashort wave radio set
System, in the system, it is 384KHz, fiber-optic transmission rate 110.592MHz that ultrashort wave radio set, which receives and dispatches if signal sampling rate,
Data recovery, baseband signal bandwidth 64KHz are carried out using the sampling clock of 4 road phase by pi/4.
Background technique
Since ultrashort wave own frequency is higher (30~300MHz), transmission characteristic and other transmission modes have essential distinction,
The sky wave of transmitting will generally penetrate ionosphere zip through space, and cannot be ionized layer and be reflected back ground, therefore ultrashort communication
System relies primarily on space direct projection propagation.For the mountain area mountain ridge, this complicated landform of urban high-rise building, best transmission mode is exactly
Accessible transmission.
Existing ultrashort communication system, usually has following defects that
1, onboard system ensure that transmission mobility, can not but overcome the mountain area mountain ridge, urban high-rise building complicated landform；
2, AIR CONVECTOR TECH ensure that transmission reliability, but be limited by human cost and transmission power, can not be widely applied；
3, position system ensure that transmission stability, lacks and often uses cable transmission, decay excessive, cost is excessively high.
Currently without the explanation or report for finding technology similar to the present invention, it is also not yet collected into money similar both at home and abroad
Material.
Summary of the invention
Aiming at the above shortcomings existing in the prior art, the object of the present invention is to provide a kind of light based on ultrashort wave radio set
Fine Transmission system.This system have no need to change ultrashort wave radio set original structure, do not depend on hardware platform performance, realize it is simple fast
Speed, it is ensured that the features such as realizing ultrashort wave radio set normal communication.
The present invention is achieved through the following technical solutions.
A kind of fibre-optic transmission system (FOTS) based on ultrashort wave radio set, comprising: transmitting path and receiving path, the transmitting path
It is formed with the main proximal end host of receiving path, distal end power amplifier and the optical fiber transmission assembly bridged between the two；Wherein:
Transmitting path, the proximal end host sample the intermediate frequency information (384KHz) of ultrashort wave radio set, are handled as base
Band signal (512KHz), and turned with frequency control signal composition data frame a by the proximal end photoelectric converter of optical fiber transmission assembly
Turn to the distal end photoelectric converter that optical signal is sent to optical fiber transmission assembly；The distal end photoelectric converter of optical fiber transmission assembly is by light
Signal is converted into electric signal and restores data, transfers to the radio-frequency module of distal end power amplifier to handle transmitting after parsing data frame a；
Receiving path, the radio-frequency information (30MHz~88MHz) that the distal end power amplifier receives antenna are sampled, are located
Reason is intermediate-freuqncy signal (384k), and passes through the distal end photoelectric conversion of optical fiber transmission assembly with interactive controlling signal composition data frame b
Device is sent to the proximal end photoelectric converter of optical fiber transmission assembly；The proximal end photoelectric converter of optical fiber transmission assembly converts optical signal
For electric signal and restore data, after parsing data frame b, interactive controlling signal is used for interface display, and intermediate frequency information transfers to proximal end
The analog-digital converter of host returns to ultrashort wave radio set.
Preferably, the data frame a and data frame b constitutes the essential information transport frame of optical fiber transmission assembly, and is based on
Essential information transport frame forms the data link layer with specific data frame structure, each frame number in the data link layer
It include the synchronous associated code of 7Bit and 29Bit user data according to frame, wherein synchronous associated code is Barker code and former and later two data
The synchronization associated code of frame is identical, and in optical fiber transmission process, data frame is sent using 110.592MHz clock as bit rate, passes through
It is transmitted in user bit insertion valid data；When user data is invalid data, which is substituted automatically
For 1/0 yard with equalization channel.
Preferably, the proximal end photoelectric converter and distal end photoelectric converter are all provided with having time data recovery component, described
Time data recovery component includes: sequentially connected FPGA processor, 2 π of N number of phase phase difference/N sampling clock module, N number of number
According to detection module and optimum sampling clock judging module；Wherein:
FPGA processor provides internal clocking management module, internal clocking management module by after external reference clock multiplier,
The 110.592MHz internal sample clocks of the road N phase by pi/2 is exported simultaneously to N number of sampling clock module；
N number of sampling clock module simultaneously samples data to be restored, exports after obtaining the road N sampled data to N number of number
According to detection module；
N number of data detection module to carrying out data-frame sync detection per sampled data all the way, for effective correlated results into
Row user data and correlated identities are exported to optimum sampling clock judging module；
Optimum sampling clock judging module is adjudicated by the optimum sampling to effective correlated results, obtains optimum sampling clock
With optimal recovery data.
Preferably, when data detection module carries out data-frame sync detection to sampled data, per sampled data needle all the way
The register of one 43Bit is moved into sampled data for each independent phase clock to an independent phase clock
In, 14Bit data in front and back therein are extracted, carry out same or operation with the known synchronous associated code of the data frame of sampled data；Fortune
The number for calculating in result 1 is then effective correlated results (as 1) more than given threshold result compared with given threshold, extracts phase
It closes mark and is exported after user data；It is less than given threshold (as 0), then is invalid correlated results.
Preferably, the N=4, sampling clock provided by 42 π of phase phase difference/N sampling clock modules are respectively as follows:
0 ° of phase sampling clocks, 90 ° of phase sampling clocks, 180 ° of phase sampling clocks and 270 ° of phase sampling clocks；
The optimum sampling of the optimum sampling clock judging module is adjudicated specifically:
Sampling clock is defined as t in time sequencing0,t1,t2Moment, wherein t1For current time, t0For t1It is previous
Moment, t2For t1Later moment in time；
In t0,t1,t2Moment makes decisions for effective correlated results, if t04 phase correlated results at moment are all
Invalid correlated results 0, and t1When 4 phase correlated results at moment are not all invalid correlated results 0, it is judged to entering synchronous mould
There is the optimum sampling moment in formula；T is set at this time2The correlated results and t at moment1The correlated results at moment is by 270 ° of phase samples
Clock is successively defined as S4, S3, S2, S1, S4 to 0 ° of phase sampling clocks ', S3 ', S2 ', S1 '；
Determine the specific rules for entering synchronous mode are as follows:
Wherein, S4 indicates t2The correlated results of 270 ° of phase samples of moment, S3 indicate t2The correlation of 180 ° of phase samples of moment
As a result, S2 indicates t2The correlated results of 90 ° of phase samples of moment, S1 indicate t2The correlated results of 0 ° of phase sample of moment, S4 ' table
Show t1The correlated results of 270 ° of phase samples of moment, S3 ' indicate t1The correlated results of 180 ° of phase samples of moment, S2 ' indicate t1When
The correlated results of 90 ° of phase samples is carved, S1 ' indicates t1The correlated results of 0 ° of phase sample of moment；
{ S4, S3, S2, S1, S4 ', S3 ', S2 ', S1 ' } value is 2 systems, and value is ignored in the x expression in value.
Ultrashort wave radio set is divided into two, far and near end by the fibre-optic transmission system (FOTS) provided by the invention based on ultrashort wave radio set
Point, centre is bridged by optical fiber；The essential information transport frame of optical fiber is constituted using special data frame structure；Using the road leggy N
Sampling clock carries out the recovery of time data；It is synchronous to the Barker code of two groups of front and back data frame to carry out coherent detection.
Compared with prior art, the invention has the following beneficial effects:
1, on the basis of not changing former radio station, increase optical fiber transmission, improve the transmittability and anti-interference ability of signal；
2, using a kind of data synchronous frame stucture and synchronous method, the recovery from fiber-optic signal to initial data is completed；
3, the present invention efficiently solves the optical fiber transmission problem of ultrashort wave radio set, will in complicated landforms such as mountain area, cities
Radio-frequency module frame height is zoomed out and is connect with ultrashort wave radio set host by optical fiber, can still carry out normal communication, and with very good
Stability.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the optical fiber data transmission system model schematic that the present invention uses.
Fig. 2 is the data link layer structural design drawing that the present invention uses.
Fig. 3 is the space CDR structure chart that the present invention uses.
Fig. 4 is optimum sampling decision diagram of the present invention under leggy sampling clock.
Fig. 5 is that the data that the present invention is obtained in the case where sending and receiving data phase differs 5 π/7 restore Modelsim emulation
Figure.
Specific embodiment
Elaborate below to the embodiment of the present invention: the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given.It should be pointed out that those skilled in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.
Embodiment
A kind of fibre-optic transmission system (FOTS) based on ultrashort wave radio set is present embodiments provided, is a kind of efficient, simple transmission
System, for the peculiar property of ultrashort wave radio set transmission information, by original ultrashort wave radio set transmission intermediate frequency information and tranmitting frequency word
Information (i.e. frequency control signal), which reconfigures, is packaged into data frame, is transmitted to transmitting terminal transmitting by optical fiber transmission assembly.Light
The component of core is time data recovery component (CDR) in fine transmission assembly, and when data are transmitted in a fiber, there is no subsidiary
Clock signal.It fiber data receiving end need be by CDR from receiving containing being mentioned in the digital signal for disturbing and shaking
Fetch bit synchronised clock, and with this clock to data-signal resampling, recover the original data signal with number specification.
Therefore the basic object of CDR is to differentiate the optimum sampling clock for receiving data.It is most of to utilize for matured product in the market
Phaselocked loop (PLL) tracks phase and frequency changes, and restores high-frequency clock.For ultrashort wave radio set, in its transmission information particularity
In customization, realize that optical fiber transmission algorithm has self bigger advantage using FPGA.
The present embodiment is further described with reference to the accompanying drawing.
As shown in Figure 1, being optical fiber data transmission system provided in this embodiment.It is by entire ultrashort wave radio set system decomposition
Proximal end host and two parts of far end radio frequency power amplifier, centre are connected by optical fiber.The working principle of the system is as follows:
The 384KHz intermediate-freuqncy signal and frequency control signal that transmitting path proximal end is exported by ultrashort wave radio set, by intermediate-freuqncy signal
The baseband signal for 512KHz is sampled and handled, optical signal is converted by SFP with frequency control signal composition data frame and is sent；
Distal end is converted into electric signal by SFP and recovers initial data, transfers to radio-frequency module processing to send after parsing data frame.
Receiving path distal end passes through radio-frequency module 30MHz~88MHz is converted to 384k intermediate-freuqncy signal, after sampling with friendship
Mutually control signal composition data frame is converted into optical signal by SFP and sends；Proximally by SFP be converted into electric signal recover it is original
Intermediate-freuqncy signal is returned to ultrashort wave radio set after parsing data frame by data.
What the present embodiment solved is the optical fiber transmission problem in above system, which includes that data link layer structure is set
Meter, CDR design and method for synchronizing data frames.
As shown in Fig. 2, the data link layer structure for the present embodiment designs, specific design is as follows:
Traditional fiber link layer mainly includes synchronization character insertion, 8B/10B codec and deserializer.And with tradition
Link layer is different, and the optical fiber transmission based on ultrashort wave radio set sends data particularity for it, devises with particular data frame
The link layer circuit of structure.
One frame data frame includes that the synchronous associated code of 7Bit and 29Bit user data form, wherein synchronous associated code is Bark
Yard, former and later two data frame structures are expressed as in figure.Data frame is using 110.592MHz clock as bit in optical fiber transmission process
Rate is sent, and is used for transmission by being inserted into valid data in user bit.When user data is invalid data, will replace automatically
Equalization channel is used on behalf of 1/0 yard.
As shown in figure 3, the CDR for the present embodiment is designed, specific design is as follows:
In fiber data receiving end, for the fiber data signal of 110.592MHz, if using time domain multiple sampling into
Row data are restored, and the processing capacity and program complexity of FPGA will all greatly improve.Therefore spatial domain multiple sampling is introduced here,
Both 2 π of N number of phase phase difference/N sampling clock is used, data recovery, referred to as space CDR are carried out to the fiber data received.
By FPGA internal clocking management module (DCM), after external reference clock multiplier, while 4 tunnel phase phases are exported
The 110.592MHz internal sample clock of poor pi/2.The data that 4 road sampling clocks simultaneously obtain optical fiber receiving end sample,
Obtain 4 road parallel sampling data.Coherent detection is carried out to per sampled data all the way, carries out user data for effective correlated results
It is exported with correlated identities.Optimum sampling clock and optimal recovery data are obtained by the judgement to effective correlated results.
The method for synchronizing data frames of the present embodiment, specific design are as follows:
After receiving serial data stream (i.e. multi-channel sampling data), the recovery of time data (CDR) will be carried out.Pass through Fig. 2 data
There is the synchronous associated code of 7Bit in each frame data known to link layer structure, and two frame synchronization associated code of front and back is identical, therefore
Two groups of synchronous associated codes can be detected simultaneously, restored for time data.
For each independent phase clock, serial data stream is moved into the register of a 43Bit, is extracted wherein
Front and back 14Bit data, with the known synchronous associated code of the data frame of sampled data carry out with or operation.1 in calculated result
Number is then active traffic (effective correlated results) more than threshold value result compared with given threshold, extracts correlated identities and uses
It is exported after user data.It is less than given threshold, as invalid correlated results.
Optimum sampling judgement must be carried out for effective correlated results of output, specific design is as follows:
Since there are phase differences for receiving end sampling clock and transmitting terminal tranmitting data register, local clock all the way is used alone
It can not carry out initial data recovery.When over-sampling clock being taken to carry out initial data recovery, due to optical fiber initial data ratio
Special rate is excessively high, and clock multiplier is difficult to realize with circuit design.The present embodiment will be solved using optimum sampling shown in Fig. 4 judgement
The above problem.
The serial data stream and 4 road phase sampling clocks of receiving end received may still remain phase difference.If initial data
Stream is binary one 01, can only go out 101 in data edges location determination under 0 ° of phase sampling clocks, during actual transmissions by
In data dithering, distortion, it will maximum probability is judged to wrong.Although the current data that remaining three phase recoveries go out is correct, companion
With the accumulation of phase error, remaining three phase determinations can still be failed by probability in judgement later.Observing Fig. 4 can
Will become apparent from local phase clock rising edge closer to receiving at data 1/2, court verdict is in true samples point, figure
Optimum sampling clock can choose as 180 ° of phase sampling clocks, and the truthful data recovered is binary one 01.
For the data link layer structure that the present embodiment proposes, optimum sampling clock judgement needs related to 3 groups after in preceding
Testing result makes decisions.If t04 phase correlated results all invalid 0 at moment, and t14 phase correlation knots at moment
Fruit is judged to entering synchronous mode when being not all invalid 0.T is set at this time2The correlated results and t at moment1The correlated results at moment from
270 ° to 0 ° phase sampling clocks are successively defined as S4, S3, S2, S1, S4 ', S3 ', S2 ', S1 '.Decision rule is as shown in table 1.
Table 1
By taking in table 1 the 3rd as an example, as t0Moment correlated results determines that result is 0, t2With t1Moment correlated results S4,
S3, S2, S1, S4 ', S3 ', S2 ', S1 ' } when being xxx0_x111, it is determined as optimum sampling clock occur.S3 ' at this time, S2 ', S1 '
It is all 1, optimum sampling clock preferentially selects intermediate time, as S2 ' moment, truthful data t0When 90 ° of phase samples of moment
The data that clock restores.11 must select t with 12 truthful datas in table1Moment, 0 ° of phase sampling clocks restored
Data, remaining correlated results and so on.
The effect of the present embodiment can be illustrated by Modelsim emulation.
The Modelsim simulated conditions of the present embodiment are Modelsim SE 10.1a simulation software, the choosing of system emulation parameter
Select one of parameter described in embodiment.Emulation content is as follows:
Sending and receiving data phase differs 5 π/7,4 phase clocks is produced for data are received, when detecting two groups of front and back
When associated code, determine that result is Binary Zero 111_1000, tabling look-up and selecting 0 ° of phase sampling clocks known to 1 is optimum sampling clock.
It is initial data by the data result that 0 ° of phase sampling clocks recovers when output identification position is 1.
0 ° of phase sampling clocks rising edge known to Fig. 5 is observed close at reception data 1/2, and 16 binary datas recovered
0aaaaaaa send data consistent with primary, it may thus be appreciated that can effectively restore high speed fibre by design method proposed by the present invention
Signal.
By above-mentioned test result as it can be seen that the present embodiment efficiently solves the optical fiber transmission problem of ultrashort wave radio set.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (4)
1. a kind of fibre-optic transmission system (FOTS) based on ultrashort wave radio set, which is characterized in that described including transmitting path and receiving path
Transmitting path and receiving path mainly by proximal end host, distal end power amplifier and bridge at optical fiber transmission assembly shape between the two
At；Wherein:
Transmitting path, the proximal end host samples the intermediate frequency information of ultrashort wave radio set, handles as baseband signal, and with frequency
Rate control signal composition data frame a is converted into optical signal by the proximal end photoelectric converter of optical fiber transmission assembly and is sent to optical fiber biography
The distal end photoelectric converter of defeated component；The distal end photoelectric converter of optical fiber transmission assembly converts optical signal into electric signal and restores
Data transfer to the radio-frequency module of distal end power amplifier to handle transmitting after parsing data frame a；
Receiving path, the distal end power amplifier samples the radio-frequency information that antenna receives, handles as intermediate-freuqncy signal, and with friendship
Mutually control signal composition data frame b is sent to the proximal end of optical fiber transmission assembly by the distal end photoelectric converter of optical fiber transmission assembly
Photoelectric converter；The proximal end photoelectric converter of optical fiber transmission assembly converts optical signal into electric signal, after parsing data frame b,
Interactive controlling signal is used for interface display, and intermediate frequency information transfers to the digital analog converter of proximal end host to return to ultrashort wave radio set；
The data frame a and data frame b constitutes the essential information transport frame of optical fiber transmission assembly, and is transmitted based on essential information
Frame forms the data link layer with specific data frame structure, and each frame data frame in the data link layer includes
The synchronous associated code of 7Bit and 29Bit user data, wherein synchronous associated code is Barker code and the synchronization phase of former and later two data frames
Pass code is identical, and in optical fiber transmission process, data frame is sent using 110.592MHz clock as bit rate, by user data
Position insertion valid data are transmitted；When user data is invalid data, which is replaced by 1/0 yard automatically with equal
Weigh channel.
2. the fibre-optic transmission system (FOTS) according to claim 1 based on ultrashort wave radio set, which is characterized in that the proximal end photoelectricity
Converter and distal end photoelectric converter are all provided with having time data recovery component, and the time data recovery component includes: successively to connect
FPGA processor, 2 π of N number of phase phase difference/N sampling clock module, N number of data detection module and the optimum sampling clock connect is sentenced
Certainly module；Wherein:
FPGA processor provides internal clocking management module, and internal clocking management module is by after external reference clock multiplier, simultaneously
The 110.592MHz internal sample clock of the road N phase by pi/2 is exported to N number of sampling clock module；
N number of sampling clock module simultaneously samples data to be restored, and output to N number of data are examined after obtaining the road N sampled data
Survey module；
N number of data detection module carries out data-frame sync detection to per sampled data all the way, is used for effective correlated results
User data and correlated identities are exported to optimum sampling clock judging module；
Optimum sampling clock judging module is adjudicated by optimum sampling to effective correlated results, obtain optimum sampling clock with most
Good recovery data.
3. the fibre-optic transmission system (FOTS) according to claim 2 based on ultrashort wave radio set, which is characterized in that in Data Detection mould
When block carries out data-frame sync detection to sampled data, it is directed to an independent phase clock per sampled data all the way, for every
Sampled data is moved into the register of a 43Bit, extracts 14Bit data in front and back therein by one independent phase clock,
Same or operation is carried out with the known synchronous associated code of the data frame of sampled data；1 number in operation result, with given threshold ratio
Compared with being then effective correlated results, as 1 more than given threshold result, exported after extracting correlated identities and user data；It is less than
Given threshold is then invalid correlated results, as 0.
4. the fibre-optic transmission system (FOTS) according to claim 3 based on ultrashort wave radio set, which is characterized in that the N=4,4
When sampling clock provided by 2 π of phase phase difference/N sampling clock module is respectively as follows: 0 ° of phase sampling clocks, 90 ° of phase samples
Clock, 180 ° of phase sampling clocks and 270 ° of phase sampling clocks；
The optimum sampling of the optimum sampling clock judging module is adjudicated specifically:
Sampling clock is defined as t in time sequencing0,t1,t2Moment, wherein t1For current time, t0For t1Previous moment,
t2For t1Later moment in time；
In t0,t1,t2Moment makes decisions for effective correlated results, if t04 phase correlated results at moment are all invalid
Correlated results 0, and t1When 4 phase correlated results at moment are not all invalid correlated results 0, it is judged to entering synchronous mode,
There is the optimum sampling moment；T is set at this time2The correlated results and t at moment1When the correlated results at moment is by 270 ° of phase samples
Clock is successively defined as S4, S3, S2, S1, S4 to 0 ° of phase sampling clocks ', S3 ', S2 ', S1 '；
Determine the specific rules for entering synchronous mode are as follows:
Wherein, S4 indicates t2The correlated results of 270 ° of phase samples of moment, S3 indicate t2The related knot of 180 ° of phase samples of moment
Fruit, S2 indicate t2The correlated results of 90 ° of phase samples of moment, S1 indicate t2The correlated results of 0 ° of phase sample of moment, S4 ' are indicated
t1The correlated results of 270 ° of phase samples of moment, S3 ' indicate t1The correlated results of 180 ° of phase samples of moment, S2 ' indicate t1Moment
The correlated results of 90 ° of phase samples, S1 ' indicate t1The correlated results of 0 ° of phase sample of moment；
{ S4, S3, S2, S1, S4 ', S3 ', S2 ', S1 ' } value is 2 systems, and value is ignored in the x expression in value.
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