CN108803300A - The punctual method of time synchronism apparatus based on constant-temperature crystal oscillator and time synchronism apparatus - Google Patents
The punctual method of time synchronism apparatus based on constant-temperature crystal oscillator and time synchronism apparatus Download PDFInfo
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- CN108803300A CN108803300A CN201810503127.3A CN201810503127A CN108803300A CN 108803300 A CN108803300 A CN 108803300A CN 201810503127 A CN201810503127 A CN 201810503127A CN 108803300 A CN108803300 A CN 108803300A
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- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G7/00—Synchronisation
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- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G5/00—Setting, i.e. correcting or changing, the time-indication
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
Abstract
The present invention relates to the punctual method of the time synchronism apparatus based on constant-temperature crystal oscillator and time synchronism apparatus, when punctual, first in the case where there is synchronous clock source, obtain the actual frequency for the reference frequency that constant-temperature crystal oscillator provides and interior pulse number per second；And in sequence, often setting number of seconds calculate setting number of seconds in pulse number and value, be denoted as β value, and obtained each and value is sequentially stored into buffer queue；So, when synchronization is lost clock source when, obtained β value is handled accordingly, obtains the frequency compensation value of constant-temperature crystal oscillator, with realize the variation of the frequency of constant-temperature crystal oscillator is predicted；Finally, pulse per second (PPS) of keeping time is generated according to frequency compensation value, realizes the punctual of time synchronism apparatus.So can be predicted and be compensated in the frequency variation for not being fully warmed-up and bringing to constant-temperature crystal oscillator by means of which, moreover, reducing subsequent time keeping error, the punctual accuracy of synchronised clock is improved.
Description
Technical field
The present invention relates to the punctual method of the time synchronism apparatus based on constant-temperature crystal oscillator and time synchronism apparatus.
Background technology
With the continuous expansion of electric system scale, the device of substation, equipment, function constantly enhance, system structure
Increasingly sophisticated, the requirement to time precision is also higher and higher.Therefore, Clock Synchronization Technology is used widely in electric power.Mesh
Before, clock is synchronized in protective device, scheduling system, fault oscillograph, EMS Energy Management System, (telemechanical is whole for distributed RTU
End), telemetering, the data processing of remote signalling, the extensive uses such as complex automatic system and line fault distance measuring.
Currently, source when time synchronism apparatus generally uses the Big Dipper to be used as synchronous with GPS satellite antenna, is accurately awarded to realize
When, using High Accuracy Constant Temperature crystal oscillator as reference frequency, frequency of keeping time is provided behind source when losing synchronous.However, constant-temperature crystal oscillator
Performance is better, and the preheating of crystal oscillator and taming time are also longer.In the case where crystal oscillator is not fully warmed-up, the frequency of crystal oscillator changes
It is larger.It to complete crystal oscillator in 2 hours and tame to reach the punctual precision of 1us/h and want since time synchronism apparatus claimed apparatus starts
It asks.Within the time period, constant-temperature crystal oscillator is not fully warmed-up.Meanwhile it being obtained according to research and experimental data, the heat of constant-temperature crystal oscillator
Frequency characteristic variations characteristic changes basically according to certain rule, thus can compensate and keep by predicting crystal oscillator frequency variation
When.
Invention content
The object of the present invention is to provide a kind of punctual methods of time synchronism apparatus based on constant-temperature crystal oscillator, to solve at present
Time synchronism apparatus be not fully warmed-up in constant-temperature crystal oscillator and the larger problem of the time keeping error that brings.Present invention simultaneously provides one
Time synchronism apparatus of the kind based on constant-temperature crystal oscillator.
To achieve the above object, the solution of the present invention includes a kind of punctual side of the time synchronism apparatus based on constant-temperature crystal oscillator
Method includes the steps that as follows：
(1) in the case where there is synchronous clock source, the actual frequency for the reference frequency that constant-temperature crystal oscillator provides is obtained, and every
Pulse number in second；
(2) in sequence, often setting number of seconds calculate setting number of seconds in pulse number and value, be denoted as β value, and will obtain
Each and value be sequentially stored into buffer queue；
(3) when synchronization is lost clock source when, obtained β value is handled accordingly, obtain constant-temperature crystal oscillator frequency mend
Value is repaid, the variation of the frequency of constant-temperature crystal oscillator is predicted with realizing；
(4) pulse per second (PPS) of keeping time is generated according to the frequency compensation value, realizes the punctual of time synchronism apparatus.
The variation of its frequency is predicted when constant-temperature crystal oscillator is not fully warmed-up, and then frequency is changed and carries out phase
The compensation answered.In the case where there is synchronous clock source, the actual frequency of reference frequency that constant-temperature crystal oscillator provides and per second is obtained
Interior pulse number；Then in sequence, often setting number of seconds calculate the pulse number in setting number of seconds and value, and will obtain
Each and value is sequentially stored into buffer queue；So, when synchronization is lost clock source when, obtained above and value is carried out corresponding
Processing, obtain the frequency compensation value of constant-temperature crystal oscillator, with realize the variation of the frequency of constant-temperature crystal oscillator is predicted.Using this
Mode can be predicted and be compensated in the frequency variation for not being fully warmed-up and bringing to constant-temperature crystal oscillator, moreover, reducing follow-up
Time keeping error.Pulse per second (PPS) of keeping time is generated according to frequency compensation value, the punctual of time synchronism apparatus is realized, that is, ensure that crystal oscillator is pre-
The punctual accuracy of hot phase, in turn ensures pulse per second (PPS) output stability, improves the punctual accuracy of synchronised clock, can be very
There are constant-temperature crystal oscillators to preheat insufficient frequency error brought for the good punctual method of elimination tradition.
When synchronization is lost when clock source, following processing is made to each β value：According to the sequence of time from back to front, every M is sought
The sum of a β value, is denoted as α values, the setting number of seconds that each α values corresponding period is M times；According to the sequence of time from back to front,
The sum per N number of α values is sought, is denoted asValue, eachIt is worth the setting number of seconds that the corresponding period is M*N times.
The calculation formula of the frequency compensation value is respectively：Δtick2i+1+ α (1) and Δ tick2i+2+α(2)；Δ tick's
Calculation is：
……
Δtick2i+1=Δ tick2i+2=Δ tick2i-1/ 2,
Wherein, i=1,2 ..., the period corresponding with α values Δ tick corresponding periods is equal；α (1) is to lose together
The last one period corresponding α values before clock source are walked, α (2) is α (1) adjacent previous periods corresponding α values.
Method is shared equally by Δ tick using remainder2i+1+ α (1) and Δ tick2i+2+ α (2) respectively mean allocation at several pieces,
And two groups of pulse per second (PPS) count values are formed, each count value reaches, that is, generates a pulse per second (PPS) output, when this two groups of pulse per second (PPS)s count
After the completion of the pulse per second (PPS) output that value is formed, i adds 1, recalculates Δ tick2i+1+ α (1) and Δ tick2i+2+ α (2), and generate phase
The pulse per second (PPS) output answered.
Monotonicity judgement is carried out to the variation of the frequency of constant-temperature crystal oscillator, if frequency changes for monotonicity, to frequency
Variation is predicted.
The present invention also provides a kind of time synchronism apparatus based on constant-temperature crystal oscillator, including execution keeping for following punctual strategy
When module：
(1) in the case where there is synchronous clock source, the actual frequency for the reference frequency that constant-temperature crystal oscillator provides is obtained, and every
Pulse number in second；
(2) in sequence, often setting number of seconds calculate setting number of seconds in pulse number and value, be denoted as β value, and will obtain
Each and value be sequentially stored into buffer queue；
(3) when synchronization is lost clock source when, obtained β value is handled accordingly, obtain constant-temperature crystal oscillator frequency mend
Value is repaid, the variation of the frequency of constant-temperature crystal oscillator is predicted with realizing；
(4) pulse per second (PPS) of keeping time is generated according to the frequency compensation value, realizes the punctual of time synchronism apparatus.
When synchronization is lost when clock source, following processing is made to each β value：According to the sequence of time from back to front, every M is sought
The sum of a β value, is denoted as α values, the setting number of seconds that each α values corresponding period is M times；According to the sequence of time from back to front,
The sum per N number of α values is sought, is denoted asValue, eachIt is worth the setting number of seconds that the corresponding period is M*N times.
The calculation formula of the frequency compensation value is respectively：Δtick2i+1+ α (1) and Δ tick2i+2+α(2)；Δ tick's
Calculation is：
……
Δtick2i+1=Δ tick2i+2=Δ tick2i-1/ 2,
Wherein, i=1,2 ..., the period corresponding with α values Δ tick corresponding periods is equal；α (1) is to lose together
The last one period corresponding α values before clock source are walked, α (2) is α (1) adjacent previous periods corresponding α values.
Method is shared equally by Δ tick using remainder2i+1+ α (1) and Δ tick2i+2+ α (2) respectively mean allocation at several pieces,
And two groups of pulse per second (PPS) count values are formed, each count value reaches, that is, generates a pulse per second (PPS) output, when this two groups of pulse per second (PPS)s count
After the completion of the pulse per second (PPS) output that value is formed, i adds 1, recalculates Δ tick2i+1+ α (1) and Δ tick2i+2+ α (2), and generate phase
The pulse per second (PPS) output answered.
Monotonicity judgement is carried out to the variation of the frequency of constant-temperature crystal oscillator, if frequency changes for monotonicity, to frequency
Variation is predicted.
Description of the drawings
Fig. 1 is the principle schematic of time synchronism apparatus；
Fig. 2 is the frequency change schematic diagram of constant-temperature crystal oscillator；
Fig. 3 be α values andThe calculation schematic diagram of value；
Fig. 4 is punctual method flow diagram；
Fig. 5 is the comparison figure that PPS is exported after not compensating and compensate.
Specific implementation mode
The present invention provides a kind of punctual method of the time synchronism apparatus based on constant-temperature crystal oscillator, includes the steps that as follows：
(1) in the case where there is synchronous clock source, the actual frequency for the reference frequency that constant-temperature crystal oscillator provides is obtained, and every
Pulse number in second；
(2) in sequence, often setting number of seconds calculate the pulse number in setting number of seconds and value, and each and value that will be obtained
It is sequentially stored into buffer queue；
(3) when synchronization is lost clock source when, to obtain and value handled accordingly, obtain constant-temperature crystal oscillator frequency benefit
Value is repaid, the variation of the frequency of constant-temperature crystal oscillator is predicted with realizing；
(4) pulse per second (PPS) of keeping time is generated according to frequency compensation value, realizes the punctual of time synchronism apparatus.
Based on the basic ideas of the method for keeping time, each step of this method is made below in conjunction with attached drawing and being described in detail.
As shown in Figure 1, time synchronism apparatus, using the punctual pulse per second (PPS) of FPGA outputs, FPGA and CPU communications connect, pass through
FPGA and CPU synchronization acquisition time devices are kept time.Therefore, in the present embodiment, time synchronism apparatus includes FPGA and CPU.By
In the punctual function of FPGA and CPU synchronization acquisition time devices, therefore, according to function, FPGA and CPU can be known as keeping
When module.
Constant-temperature crystal oscillator provides working frequency f, that is, provides the reference pulse that frequency is f, FPGA is using this frequency as counting
Benchmark stamps tick markers to the pulse per second (PPS) of synchronised clock source synchronizing signal.If it is assumed that the tick markers of the pulse per second (PPS) in N seconds
For C, then, the practical concussion frequency of constant-temperature crystal oscillator can be calculated according to CPU, be：
F=C/N
So, the number for the reference pulse that the constant-temperature crystal oscillator between two adjacent pulse per second (PPS)s that synchronous clock source is sent out is sent out
This is just the numerical value of frequency f.
CPU selects source signal synchronization time according to time source logic, moreover, for the ease of subsequent data processing, it will
The corresponding tick markers of effective pulse per second (PPS), i.e., the reference pulse spacing value that constant-temperature crystal oscillator provides are deposited successively according to chronological order
Enter ram buffer, in the present embodiment, buffer size is set as 64.
When buffering area is full, 64 time intervals of buffering area are carried out and counted, one and value are obtained, when due to one
Between to be spaced corresponding be 1 pulse per second (PPS), the corresponding time is 1 second, then, 64 time intervals represent the crystalline substance of the constant temperature in 64 seconds
It shakes the number of the reference pulse sent out, i.e., the number of the reference pulse sent out the constant-temperature crystal oscillator in 64 seconds is added.So, with
The flowing of time, sum of the every 64 seconds numbers for just calculating the reference pulse that a constant-temperature crystal oscillator in this 64 seconds is sent out, and value are remembered
For β value.In addition, the reference frequency sent out due to constant-temperature crystal oscillator is 100MHz ranks, numerical value is excessive in order to prevent and nothing
Method accurately caches, that is to say, that in order to which significance bit is not lost in CPU calculating, calculates β value in the following ways：By interior perseverance per second
The corresponding number per pulse per second (PPS) of actual frequency that warm crystal oscillator is sent out subtracts a standard value, obtains a difference, the present embodiment
In, which is the corresponding number per pulse per second (PPS) of the nominal frequency of constant-temperature crystal oscillator, in this case, corresponding difference per second
Numerical value would not be very big, prevents from losing significance bit, calculation formula is：
Wherein, t0It is constant-temperature crystal oscillator in nominal frequency f0Under second arteries and veins spacing value, i.e., reference pulse number per second, such as：
Value is 99999950, tiThe pulse number per second for being constant-temperature crystal oscillator under actual frequency.
It obtains a β value within every 64 seconds, then obtained each β value is sequentially stored into buffer queue, in the present embodiment, if
512 buffer queues are set, buffer queue is joined the team according to practical sequencing, therefore, can be obtained from the buffer queue
The β value that nearest every 64 seconds crystal oscillator frequencies count.
Therefore, according to above-mentioned formula it is found that f=(64 β+t0)/64, therefore β value can clearly react the frequency of constant-temperature crystal oscillator
Rate changes.The power on characteristic of constant-temperature crystal oscillator is：The frequency values that constant-temperature crystal oscillator preheats early period change greatly whithin a period of time, this is just
It is the power on characteristic of constant-temperature crystal oscillator, as the time of booting preheating lengthens, the rate-adaptive pacemaker of constant-temperature crystal oscillator is up to stabilization.For
Different crystal oscillators, power on characteristic are different, and are same crystal oscillator in time, and retest result may also be different.When for same
One crystal oscillator, in a certain range, variation is little for the trend of frequency variation and power on characteristic when booting, for realizing punctual mend
It repays and provides chance.
Obtained β buffering area variables can clearly describe the power on characteristic of crystal oscillator, as shown in Fig. 2, Fig. 2 is β-t figures, equally
It is also the frequency change schematic diagram of constant-temperature crystal oscillator.Thus figure is it can be seen that the every 64 seconds tick of constant-temperature crystal oscillator count change at any time
Change relationship.(100*64=6400s) variation is apparent in preceding 100 periods.Show that crystal oscillator does not preheat fully at this time.With the time
Movement, crystal oscillator frequency variation tends towards stability, variation tendency tends towards stability.What we to be done is exactly that energy basis for forecasting crystal oscillator is pre-
This performance of heat, to realize more accurately timekeeping performance.
When losing external synchronization clock source, calculated as follows according to the β value in buffer queue, from the nearest time to
Preceding calculating, the i.e. sequence according to the time from back to front：Calculate every 8 β value and value, α values are denoted as, each two α values are then calculated
And value, be denoted asValue.Wherein, α (1), α (2) ... be according to from being obtained forward at the time of losing external synchronization clock source
, α (1) be the pulse of nearest 64*8=512s and value, α (2) be before α (1) pulse of 64*8=512s and value, with such
It pushes away.Similarly with α values,... and according to from being obtained forward at the time of losing external synchronization clock source
,Be the pulse of nearest 64*8*2=1024s and value,It isThe pulse of preceding 64*8*2=1024s
And value, and so on, i.e.,
In the present embodiment, 64 α values are sought according to β value, be respectively α (1), α (2) ..., α (64), and then seek 32Value,It forward, that is, is pressed from recently as shown in figure 3, representing the time from top to bottom
Calculated according to time sequence from back to front, α (n) andAs tick numbers in the crystal oscillator frequency at pulse per second (PPS) interval.
In addition, to prevent constant-temperature crystal oscillator from changing the influence of randomness at random, the stabilization to crystal oscillator frequency during preheating is needed
Property judged, only when crystal oscillator frequency variation dull just progress frequency predication and adjustment.According to the actual performance of constant-temperature crystal oscillator into
The monotonicity of the synchronous pulse per second (PPS) interval tick of row judges, provides following judgment mode：Choose 4It is worth, is respectivelyIt calculates
If above-mentioned two inequality is set up simultaneously, then it is assumed that crystal oscillator frequency is to be monotonically changed in this period.
In the judgement of monotonicity, only the frequency of crystal oscillator warm-up phase is judged and adjusted, i.e., in buffering area at least
The case where preserving 1.5 hours synchronization pulse per second (PPS) information, predicting the frequency variation after keeping time.If monotonicity is set up, according to
Carry out subsequent frequency predication and compensation；If monotonicity is invalid, without compensation, according only to 1024 seconds finally preserved
Pulse information generates pulse of keeping time, this part is not present invention point, is just no longer illustrated here.
In order to eliminate the normally distributed error of crystal oscillator, time synchronism apparatus by according to the second interval TICK value of last 1024s,
I.e. baseline sample is α (1) and α (2), and generates output pulse per second (PPS) buffer queue data, compensation after carrying out crystal oscillator frequency compensation
Method：
F=(Δ ticki+α(j))/N+f0
F is the actual output frequency of crystal oscillator, f0It is the nominal frequency of constant-temperature crystal oscillator.So：
Δ f=f-f0=(Δ ticki+α(j))/N
Therefore, as long as Δ tickiSelection is reasonable, can obtain accurate actual output frequency.
According to following compensation value calculation method, the error of the frequency of output and the actual output frequency of constant-temperature crystal oscillator can be made
It is minimum, it is ensured that the punctual precision of time synchronism apparatus, i=1,2 ...
……
Δtick2i+1=Δ tick2i+2=Δ tick2i-1/2
Period corresponding with α values Δ tick corresponding periods is equal, is 512 seconds.Δtick1It is nearest 512 seconds
Corresponding offset, Δ tick2It is Δ tick1Preceding 512 seconds corresponding offsets, other and so on.In addition, working as Δ tick
When=1, stop compensation.
After obtaining Δ tick, according to Δ tick after compensation2i+1+ α (1) and Δ tick2i+2The value of+α (2) generates two groups 512
Tick counters interval, and export pulse per second (PPS) according to counter cycle.
In the present embodiment, method is shared equally using remainder and generates pulse per second (PPS) output sequence, wherein remainder shares method equally in patent
Number for CN201410689747.2, entitled《A kind of efficient crystal oscillator frequency timekeeping method》Patent application in existing retouch
It states.The pulse per second (PPS) array for sharing method generation equally using remainder is more uniform relative to 512 tick values of acquired original, but tick
Summation is not lost.
Method is shared equally by the Δ tick after compensation using remainder2i+1+ α (1) and Δ tick2i+2+ α (2) respectively mean allocation at
512 parts, form 2 groups of relatively uniform 512 seconds arteries and veins value count values.
FPGA counts the real-time frequency of crystal oscillator, takes out share method 2 groups of second arteries and veins value meters of generation equally according to remainder successively
Numerical value, each count value reach, that is, generate a pulse per second (PPS) output.After the completion of 2 groups of count value outputs, i adds 1, calculates mend again
Repay Δ tick2i+1+ α (1) and Δ tick2i+2+ α (2), and punctual pulse per second (PPS) is alternately produced, it realizes and keeps time after synchronous clock source is lost
Purpose.That is, sharing method equally by the Δ tick after compensation first with remainder1+ α (1) and Δ tick2+ α (2) is put down respectively
512 parts are distributed into, 2 groups of relatively uniform 512 seconds arteries and veins value count values are formed, each count value reaches, that is, generates a second
Pulse exports.After the completion of this 2 groups of count value outputs, compensation Δ tick is calculated3+ α (1) and Δ tick4+ α (2), then will compensation
Δ tick afterwards3+ α (1) and Δ tick4Mean allocation forms 2 groups of relatively uniform 512 seconds arteries and veins values to+α (2) at 512 parts respectively
Count value, each count value reach, that is, generate a pulse per second (PPS) output.After the completion of this 2 groups of count value outputs, compensation Δ is calculated
tick5+ α (1) and Δ tick6+ α (2) generates second arteries and veins value count value, and each count value reaches, that is, generates a pulse per second (PPS) output.
And so on, punctual pulse per second (PPS) is alternately produced, realizes the purpose kept time after synchronous clock source is lost.
Fig. 4 is the flow diagram of punctual method.
Fig. 5 is the comparison figure that PPS is exported after not compensating and compensate.As seen from the figure, after not compensating PPS sequences and compensation
PPS summation deviation delta t ick (such as scheming big dash area) in 512 PPS, deviation delta t ick, which is averaged, is assigned to single PPS
The small opacities part of output.Offset Δ tick1 corrects for the frequency error Δ f caused by changing due to crystal oscillator frequency so that
Reduce the time error caused by 512 PPS of output.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in introduction according to the present invention
The model of shape, formula, parameter do not need to spend creative work.It is right without departing from the principles and spirit of the present invention
The change, modification, replacement and modification that embodiment carries out are still fallen in protection scope of the present invention.
Claims (10)
- A kind of method 1. time synchronism apparatus based on constant-temperature crystal oscillator is kept time, which is characterized in that include the steps that as follows：(1) in the case where there is synchronous clock source, obtain constant-temperature crystal oscillator provide reference frequency actual frequency and it is per second in Pulse number；(2) in sequence, often setting number of seconds calculate setting number of seconds in pulse number and value, be denoted as β value, and each by what is obtained It is sequentially stored into buffer queue with value；(3) when synchronization is lost clock source when, obtained β value is handled accordingly, obtains the frequency compensation value of constant-temperature crystal oscillator, The variation of the frequency of constant-temperature crystal oscillator is predicted with realizing；(4) pulse per second (PPS) of keeping time is generated according to the frequency compensation value, realizes the punctual of time synchronism apparatus.
- The method 2. time synchronism apparatus according to claim 1 based on constant-temperature crystal oscillator is kept time, which is characterized in that when losing When synchronous clock source, following processing is made to each β value：According to the sequence of time from back to front, the sum of every M β value is sought, is denoted as α values, the setting number of seconds that each α values corresponding period is M times；According to the sequence of time from back to front, seek per N number of α values Be denoted asValue, eachIt is worth the setting number of seconds that the corresponding period is M*N times.
- The method 3. time synchronism apparatus according to claim 2 based on constant-temperature crystal oscillator is kept time, which is characterized in that the frequency The calculation formula of rate offset is respectively：Δtick2i+1+ α (1) and Δ tick2i+2+α(2)；The calculation of Δ tick is：……Δtick2i+1=Δ tick2i+2=Δ tick2i-1/ 2,Wherein, i=1,2 ..., the period corresponding with α values Δ tick corresponding periods is equal；α (1) is when losing synchronous The last one period corresponding α values before Zhong Yuan, α (2) are α (1) adjacent previous periods corresponding α values.
- The method 4. time synchronism apparatus according to claim 3 based on constant-temperature crystal oscillator is kept time, which is characterized in that more than utilization Number shares method equally by Δ tick2i+1+ α (1) and Δ tick2i+2+ α (2) difference mean allocations form two groups of second arteries and veins at several pieces Count value is rushed, each count value reaches, that is, a pulse per second (PPS) output is generated, when the pulse per second (PPS) that this two groups of pulse per second (PPS) count values are formed After the completion of output, i adds 1, recalculates Δ tick2i+1+ α (1) and Δ tick2i+2+ α (2), and generate corresponding pulse per second (PPS) output.
- The method 5. time synchronism apparatus according to claim 1 based on constant-temperature crystal oscillator is kept time, which is characterized in that constant temperature The variation of the frequency of crystal oscillator carries out monotonicity judgement, if frequency changes for monotonicity, predicts the variation of frequency.
- 6. a kind of time synchronism apparatus based on constant-temperature crystal oscillator, which is characterized in that have the punctual of following punctual strategy including executing Module：(1) in the case where there is synchronous clock source, obtain constant-temperature crystal oscillator provide reference frequency actual frequency and it is per second in Pulse number；(2) in sequence, often setting number of seconds calculate setting number of seconds in pulse number and value, be denoted as β value, and each by what is obtained It is sequentially stored into buffer queue with value；(3) when synchronization is lost clock source when, obtained β value is handled accordingly, obtains the frequency compensation value of constant-temperature crystal oscillator, The variation of the frequency of constant-temperature crystal oscillator is predicted with realizing；(4) pulse per second (PPS) of keeping time is generated according to the frequency compensation value, realizes the punctual of time synchronism apparatus.
- 7. the time synchronism apparatus according to claim 6 based on constant-temperature crystal oscillator, which is characterized in that clock when synchronization is lost When source, following processing is made to each β value：According to the sequence of time from back to front, the sum of every M β value is sought, is denoted as α values, each The setting number of seconds that the α values corresponding period is M times；According to the sequence of time from back to front, the sum per N number of α values is sought, is denoted as Value, eachIt is worth the setting number of seconds that the corresponding period is M*N times.
- 8. the time synchronism apparatus according to claim 7 based on constant-temperature crystal oscillator, which is characterized in that the frequency compensation value Calculation formula be respectively：Δtick2i+1+ α (1) and Δ tick2i+2+α(2)；The calculation of Δ tick is：……Δtick2i+1=Δ tick2i+2=Δ tick2i-1/ 2,Wherein, i=1,2 ..., the period corresponding with α values Δ tick corresponding periods is equal；α (1) is when losing synchronous The last one period corresponding α values before Zhong Yuan, α (2) are α (1) adjacent previous periods corresponding α values.
- 9. the time synchronism apparatus according to claim 8 based on constant-temperature crystal oscillator, which is characterized in that utilize the remainder side of sharing equally Method is by Δ tick2i+1+ α (1) and Δ tick2i+2+ α (2) difference mean allocations form two groups of pulse per second (PPS) count values at several pieces, Each count value reaches, that is, generates a pulse per second (PPS) output, is completed when the pulse per second (PPS) that this two groups of pulse per second (PPS) count values are formed exports Afterwards, i adds 1, recalculates Δ tick2i+1+ α (1) and Δ tick2i+2+ α (2), and generate corresponding pulse per second (PPS) output.
- 10. the time synchronism apparatus according to claim 6 based on constant-temperature crystal oscillator, which is characterized in that constant-temperature crystal oscillator The variation of frequency carries out monotonicity judgement, if frequency changes for monotonicity, predicts the variation of frequency.
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| CN109597297A (en) * | 2018-12-11 | 2019-04-09 | 烟台持久钟表有限公司 | A kind of crystal oscillator compensation method and device |
| CN110908272A (en) * | 2019-12-20 | 2020-03-24 | 昆明理工大学 | 1pps pulse signal timing method |
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