CN103869156A - DMTD measuring method and measuring system - Google Patents
DMTD measuring method and measuring system Download PDFInfo
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- CN103869156A CN103869156A CN201410130410.8A CN201410130410A CN103869156A CN 103869156 A CN103869156 A CN 103869156A CN 201410130410 A CN201410130410 A CN 201410130410A CN 103869156 A CN103869156 A CN 103869156A
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Abstract
The invention provides a DMTD measuring method and measuring system. According to the DMTD measuring method and measuring system, an uninterrupted common source signal is selected, two counters are used for acquiring the time counting values of the common source signal respectively in real time, when the rising edges of reference signals and the rising edges of detected signals come respectively, the time counting values of the current two counters are acquired respectively, the number of the rising edges of the reference signals and the number of the rising edges of the detected signals align at each other, the two time counting values corresponding to the aligning numbers are subtracted to obtain an accurate time difference value, and other frequency differences, phase differences, Allan variances and the like can be calculated according to the accurate time difference value. The common source signal mode is used, the problem that a traditional exclusive-OR gate mode can not conduct accurate measurement in times of edge overlapping or when two edge time differences are smaller than hardware response time is solved, and the cycle fuzzy phenomenon which commonly exists in the DMTD measuring process is avoided. In brief, the DMTD measuring method and measuring system can achieve quick, accurate, real-time and unlimited measuring with low cost.
Description
Technical field
The present invention relates to a kind of two mixing time difference method, specifically a kind of two mixing time difference measurement method and measuring system.
Background technology
Two mixing time difference methods are D.W.Allan methods at the measurement high stability atomic clock of the proposition seventies in last century, develop into today its become the highest method of single-frequency accuracy of measurement, target measurement when many advanced persons' temporal frequency laboratory all adopts this method to carry out in the world.
In two mixing time difference measurement processes, often there is cycle blooming.Cycle blooming refers to that, in the time of two mixing time difference system comparison, reference signal and measured signal are owing to existing frequency departure, and along with long measurement, coincidence or cycle redirect occur for reference signal and measured signal meeting, and then cause measuring inaccurate phenomenon.
Traditional method adopts time-interval counter to measure the time difference, and its principle of work is that measured signal Fin and reference signal Ref are shaped to low frequency signal, by d type flip flop, then uses an XOR gate, to obtain two time differences between signals edge.But because the circuit delay in counter is greater than 500ps, the resolution of system is greater than 100ps, if two time differences be less than 100ps just can not Measurement accuracy.As shown in Figure 1, the signal that there is shown reference signal Ref and measured signal Fin along between the time difference, be respectively △ t1, △ t2, △ t3, △ t4 and △ t5 ', but, because △ t1 is less than 100ps, As time goes on, system is located to tell the time difference between rising edge and the negative edge that this time difference is reference signal Ref at △ t5 ', cause counter to miss one-shot measurement, finally make measurement result inaccurate.
Summary of the invention
One of object of the present invention is just to provide a kind of two mixing time difference measurement method, to solve the problem that often has cycle blooming in two mixing time difference measurement processes.
Two of object of the present invention is just to provide a kind of two mixing time difference measurement system, to realize fast, to carry out accurately and real-time time difference measurement.
The present invention is achieved in that a kind of two mixing time difference measurement method, comprises the steps:
A, choose a continual common source signal;
B, adopt the first counter and the second counter frequency counting of common source signal be converted to time counting described in Real-time Obtaining respectively;
C, judge whether the rising edge of reference signal and measured signal arrives, if the rising edge of described reference signal and described measured signal does not all arrive, continue execution step c; If while having the rising edge arrival of arbitrary signal or the rising edge of two signals all to arrive, perform step d;
D, in the time that the rising edge of described reference signal arrives, the time counting value of current described the first counter being obtained by the first latch is carried out latch, and by the 3rd counter, the number of described reference signal rising edge is counted, count results is carried out latch by the 3rd latch; In the time that the rising edge of described measured signal arrives, the time counting value of current described the second counter being obtained by the second latch is carried out latch, and by four-counter, the number of described measured signal rising edge is counted, count results is carried out latch by quad latch;
E, read described reference signal and described measured signal rising edge arrive time time counting value, read the rising edge number of described reference signal and described measured signal simultaneously, and read data deposited in storer;
F, the number of described reference signal rising edge in described storer is alignd with the number of described measured signal rising edge;
G, carry out calculation process from extracting in described storer with described reference signal and the described measured signal corresponding time counting value of number of aliging, obtain time difference value;
H, calculate frequency difference, differ and Allan variance according to described time difference value, and result of calculation is deposited in described storer;
I, execution step c.
Between described step h and described step I, also include following steps:
J, judge that whether the data of storing in described storer reach the upper limit of memory span, if so, perform step k; If not, perform step i;
K, delete the data before aligned position in described storer, remaining data is moved forward from described aligned position, perform step afterwards i.
Between described step e and described step f, also include following steps:
L, judge in described the first counter, described the second counter, described the 3rd counter and described four-counter whether have data from overflow, if having data from overflow in arbitrary counter, perform step m; If equal data from overflow not in all counters, performs step f;
M, for the counter that has data from overflow, make the full value of cumulative this counter of counting variable wherein, perform step afterwards f.
Provided by the present invention pair of mixing time difference measurement method tool has the following advantages:
First, the present invention is by choosing a continual common source signal, by two counters time counting value of this common source signal of Real-time Obtaining respectively, in the time that the rising edge of reference signal and measured signal arrives respectively, obtain respectively the time counting value when the first two counter, make the rising edge number alignment of reference signal and measured signal, and two the time counting values corresponding with the number of aliging are subtracted each other, can draw time difference value accurately.The mode of this employing common source signal, ideally solve traditional XOR gate mode along overlapping or two problems that can not carry out Measurement accuracy while being less than the Hardware Response Delay time along the time difference, solved in two mixing time difference measurement processes the normal cycle blooming existing, and to the pulse width of time difference measurement without any restriction.
The second, when the rising edge of reference signal or measured signal arrives, while also occurring to interrupt; Based on interrupt nesting principle, therefore in measuring process of the present invention, can not lose any one time difference measurement, time difference measurement can be realized gapless real-time sampling.In addition the present invention adopts the number of reference signal and measured signal rising edge is added up, and number is alignd one by one, therefore realized time difference alignment truly, save in conventional art the staged cycle has been changed to the step of carrying out the step of polishing processing and actual cycle being measured, also made time difference measurement more accurately, fast simultaneously.
The 3rd, the situation of overflowing that the present invention can Real-Time Monitoring counter, and there being the full value that makes in time cumulative this counter of counting variable while overflowing.This processing mode is that the principle that is a fixed numbers based on counter cycle is carried out, and can be realized in cycle fuzzy region and be carried out seamless connection, the error having produced while having solved well traditional approach treatment cycle blooming by this processing.
The 4th, on memory span reaches, in limited time, by deleting the data before aligned position, that can avoid in storer that overabundance of data causes overflows and the slowing down of arithmetic speed.In addition, the present invention can also carry out periodicity cutting to the variable that carries out periodic accumulation in each counter, this disposal route also can be avoided excessive the overflowing and the slowing down of arithmetic speed of causing of variable, due to periodicity cutting variable, so cumulative variable does not have the upper limit, can not overflow simultaneously, if selected suitably, there are enough storage spaces simultaneously, can unconfinedly measure in theory, the restriction of the not free upper limit.
The present invention also provides a kind of pair of mixing time difference measurement system, comprises counting unit, latch units, single-chip microcomputer and storer; Described counting unit connects described latch units, and described latch units connects described single-chip microcomputer, and described single-chip microcomputer connects described storer;
Described counting unit comprises the first counter, the second counter, the 3rd counter and four-counter; Described latch units comprises the first latch, the second latch, the 3rd latch and quad latch; Described the first counter and described the first latch join, and described the second counter and described the second latch join, and described the 3rd counter and described the 3rd latch join, and described four-counter and described quad latch join;
Described the first counter and described the second counter be used for respectively Real-time Obtaining common source signal frequency counting and be converted to time counting;
Described the first latch carries out latch for the time counting value of in the time that the rising edge of reference signal arrives, current described the first counter being obtained;
Described the second latch carries out latch for the time counting value of in the time that the rising edge of measured signal arrives, current described the second counter being obtained;
Described the 3rd counter for counting the number of current described reference signal rising edge in the time that the rising edge of reference signal arrives;
Described four-counter for counting the number of current described measured signal rising edge in the time that the rising edge of measured signal arrives;
Described the 3rd latch for carrying out latch to the count results of current described the 3rd counter in the time that the rising edge of reference signal arrives;
Described quad latch for carrying out latch to the count results of current described four-counter in the time that the rising edge of measured signal arrives;
Described single-chip microcomputer comprises the first judging unit, data-reading unit, number alignment unit and computing unit;
Whether described the first judging unit arrives for the rising edge of real-time judge reference signal and measured signal;
Time counting value when described data-reading unit arrives for read the rising edge of reference signal and measured signal from described latch units and the rising edge number of reference signal and measured signal, and read data are deposited in described storer;
Described number alignment unit is alignd with the number of described measured signal rising edge for the number that makes described reference signal rising edge in described storer;
Described computing unit is used for extracting in described storer and described reference signal and described measured signal are alignd, and the corresponding time counting value of number is carried out calculation process, obtain time difference value, calculate frequency difference, differ and Allan variance according to described time difference value afterwards, and result of calculation is deposited in described storer.
Described single-chip microcomputer also comprises that the second judging unit and data delete unit;
Described the second judging unit is for judging whether the data of storing in described storer reach the upper limit of memory span;
Described data delete that unit, for being to delete the data before aligned position in described storer while being in the judged result of described the second judging unit, makes remaining data move forward from described aligned position.
Described single-chip microcomputer also comprises the 3rd judging unit and the cumulative unit of counting variable;
Described the 3rd judging unit is used for judging whether described the first counter, described the second counter, described the 3rd counter and described four-counter have data from overflow;
When there is data from overflow the cumulative unit of described counting variable for judging arbitrary counter at described the 3rd judging unit, make the full value of cumulative this counter of calculating variable in the counter of this overflow data.
Provided by the present invention pair of mixing time difference measurement system, can realize fast, carry out in real time time difference measurement, can solve the matching measurement problem while there is frequency departure between reference signal and measured signal completely, has guaranteed the accuracy of measuring.And the present invention can realize the matching measurement of any different frequent points in theory, Measuring Time can endless.Have, the present invention, compared with existing measuring system, can save hardware cost again.
Accompanying drawing explanation
Fig. 1 is that tradition adopts time-interval counter to measure the principle schematic that the time difference produces error.
Fig. 2 is the structured flowchart of counting unit and latch units in the two mixing time difference measurement systems of the present invention.
Fig. 3 is the principle schematic that the present invention measures the time difference.
Fig. 4 is the schematic flow sheet of the two mixing time difference measurement methods of the present invention.
Embodiment
Embodiment 1, a kind of two mixing time difference measurement systems.
Provided by the present invention pair of mixing time difference measurement system comprises counting unit, latch units, single-chip microcomputer and storer.Counting unit connects latch units, and latch units connects single-chip microcomputer, single-chip microcomputer connected storage.
As shown in Figure 2, there is shown the structured flowchart of counting unit and latch units.Counting unit comprises the first counter, the second counter, the 3rd counter and four-counter; Latch units comprises the first latch, the second latch, the 3rd latch and quad latch.The first counter and the first latch join, and the second counter and the second latch join, and the 3rd counter and the 3rd latch join, and four-counter and quad latch join.
The first counter and the second counter be used for respectively Real-time Obtaining common source signal O frequency counting and be converted to time counting.The first latch carries out latch for the time counting value of in the time that the rising edge of reference signal Ref arrives, current the first counter being obtained, and this time counting value is the time counting value of reference signal Ref, and the first latch can be by this data output; The rising edge of reference signal Ref is reference signal Ref interruption while arrival time.The second latch carries out latch for the time counting value of in the time that the rising edge of measured signal Fin arrives, current the second counter being obtained, and this time counting value is the time counting value of measured signal Fin, and the second latch can be by this data output; The rising edge of measured signal Fin is measured signal Fin interruption while arrival time.
The 3rd counter for counting the number of current reference signal Ref rising edge in the time that the rising edge of reference signal Ref arrives; The 3rd latch is for the count results of the 3rd counter is carried out to latch, and the rising edge number of exportable reference signal Ref.Four-counter for counting the number of current measured signal Fin rising edge in the time that the rising edge of measured signal Fin arrives; Quad latch is for the count results of four-counter is carried out to latch, and the rising edge number of exportable measured signal Fin.
Single-chip microcomputer comprises the first judging unit, data-reading unit, number alignment unit and computing unit.
Whether the first judging unit arrives for the rising edge of real-time judge reference signal and measured signal.
Time counting value when data-reading unit arrives for read the rising edge of reference signal and measured signal from latch units and the rising edge number of reference signal and measured signal, and read data are deposited in storer.
Number alignment unit is for making the number of storer internal reference signals rising edge align with the number of measured signal rising edge, even if the 1st rising edge of reference signal aligns with the 1st rising edge of measured signal, the 2nd rising edge of reference signal alignd with the 2nd rising edge of measured signal, and the rest may be inferred.
Computing unit carries out calculation process for the corresponding time counting value of number of aliging from extraction in storer and reference signal and measured signal, obtain time difference value, afterwards according to time difference value, again in conjunction with gate time, calculate frequency difference, differ with Allan variance etc., finally result of calculation is deposited in storer.As shown in Figure 3, choose the time counting value corresponding with the number of aliging, that is: make the 1st the rising time count value Tf1 of the corresponding measured signal Fin of the 1st rising time count value Tr1 of reference signal Ref, the 2nd the rising time count value Tf2 of the corresponding measured signal Fin of the 2nd rising time count value Tr2 of reference signal Ref, the rest may be inferred, the corresponding Tf3 of Tr3, the corresponding Tf4 of Tr4, the corresponding Tf5 of Tr5, Time difference value is △ t1=Tr1-Tf1, △ t2=Tr2-Tf2 ...
Single-chip microcomputer can also comprise that the second judging unit, data delete unit, the 3rd judging unit and counting variable accumulation unit.
The second judging unit is for judging whether the data of storing in storer reach the upper limit of memory span; Data delete that unit, for being to delete the data before aligned position in storer while being in the judged result of the second judging unit, makes remaining data move forward from aligned position.
The 3rd judging unit is used for judging whether the first counter, the second counter, the 3rd counter and four-counter have data from overflow; When there is data from overflow the cumulative unit of counting variable for judging arbitrary counter at the 3rd judging unit, make the full value of cumulative this counter of calculating variable in the counter of this overflow data.
Certainly, single-chip microcomputer can also comprise the 4th judging unit and variable cutting unit.The 4th judging unit is for judging whether the counting variable of the first counter, the second counter, the 3rd counter and four-counter reaches the upper limit of capacity; Variable cutting unit reaches capacity for the counting variable of judging arbitrary counter at the 4th judging unit upper in limited time, the variable of periodic accumulation in this counter is carried out to periodicity cutting.
Embodiment 2, a kind of two mixing time difference measurement methods.
As shown in Figure 4, provided by the present invention pair of mixing time difference measurement method comprises the steps:
1. initiation parameter, chooses the reference signal that a continual common source signal was measured as the duration.
2. adopt the first counter and the second counter respectively Real-time Obtaining common source signal frequency counting and be converted to time counting.
Whether the rising edge that 3. judges reference signal and measured signal arrives, the rising edge that can adopt two interrupt sources to obtain respectively reference signal and measured signal produces interruption, by judging whether reference signal and measured signal are interrupted and then judge whether rising edge arrives; If the rising edge of reference signal and measured signal does not all arrive, continue execution step 3.; If while having the rising edge arrival of arbitrary signal or the rising edge of two signals all to arrive, execution step 4..
4. in the time that the rising edge of reference signal arrives, the time counting value of current the first counter being obtained by the first latch is carried out latch, and by the 3rd counter, the number of reference signal rising edge is counted, and count results is carried out latch by the 3rd latch; In the time that the rising edge of measured signal arrives, the time counting value of current the second counter being obtained by the second latch is carried out latch, and by four-counter, the number of measured signal rising edge is counted, and count results is carried out latch by quad latch.
In this step, in the time that reference signal rising edge arrives, the count value of current the first counter is carried out to latch, in the time that measured signal rising edge arrives, the count value of current the second counter is carried out to latch, thereby can be read at any time by corresponding program follow-up.
5. in the time that producing interruption, reference signal rising edge the first counter current count value has been carried out to latch because of in the first latch, so program can read at any time, and measured signal produces while interruption and also can carry out in real time data and read, can read the now rising edge number of reference signal and measured signal simultaneously.This step is time counting value while arriving of the rising edge that reads reference signal and measured signal and the rising edge number of reference signal and measured signal, and read data is deposited in storer.
6. judge in the first counter, the second counter, the 3rd counter and four-counter whether have data from overflow, if there is data from overflow phenomenon in any one counter, execution step 7.; If all there is not data from overflow phenomenon in all counters, execution step 8..
7. for the counter that has data from overflow, make the full value of cumulative this counter of counting variable wherein, execution step 8. afterwards.
8. make the number of storer internal reference signals rising edge align with the number of measured signal rising edge, that is: the 1st rising edge of reference signal alignd with the 1st rising edge of measured signal, the 2nd rising edge of reference signal alignd with the 2nd rising edge of measured signal, and the rest may be inferred.
9. carry out calculation process from extraction in storer and reference signal and the measured signal corresponding time counting value of number of aliging, obtain time difference value.
Specifically can be referring to Fig. 3, choose the time counting value corresponding with the number of aliging, that is: make the 1st the rising time count value Tf1 of the corresponding measured signal Fin of the 1st rising time count value Tr1 of reference signal Ref, the 2nd the rising time count value Tf2 of the corresponding measured signal Fin of the 2nd rising time count value Tr2 of reference signal Ref, the rest may be inferred, the corresponding Tf3 of Tr3, the corresponding Tf4 of Tr4, the corresponding Tf5 of Tr5, Time difference value is △ t1=Tr1-Tf1, △ t2=Tr2-Tf2 ...
10. according to time difference value in conjunction with gate time, calculate frequency difference, differ with Allan variance etc., and result of calculation is deposited in storer.
Judge whether the data of storing in storer reach the upper limit of memory span, if so, execution step; If not, perform step 3..
Delete the data before aligned position in storer, remaining data is moved forward from aligned position, execution step 3. afterwards.
Claims (6)
1. two mixing time difference measurement methods, is characterized in that, comprise the steps:
A, choose a continual common source signal;
B, adopt the first counter and the second counter frequency counting of common source signal be converted to time counting described in Real-time Obtaining respectively;
C, judge whether the rising edge of reference signal and measured signal arrives, if the rising edge of described reference signal and described measured signal does not all arrive, continue execution step c; If while having the rising edge arrival of arbitrary signal or the rising edge of two signals all to arrive, perform step d;
D, in the time that the rising edge of described reference signal arrives, the time counting value of current described the first counter being obtained by the first latch is carried out latch, and by the 3rd counter, the number of described reference signal rising edge is counted, count results is carried out latch by the 3rd latch; In the time that the rising edge of described measured signal arrives, the time counting value of current described the second counter being obtained by the second latch is carried out latch, and by four-counter, the number of described measured signal rising edge is counted, count results is carried out latch by quad latch;
E, read described reference signal and described measured signal rising edge arrive time time counting value, read the rising edge number of described reference signal and described measured signal simultaneously, and read data deposited in storer;
F, the number of described reference signal rising edge in described storer is alignd with the number of described measured signal rising edge;
G, carry out calculation process from extracting in described storer with described reference signal and the described measured signal corresponding time counting value of number of aliging, obtain time difference value;
H, calculate frequency difference, differ and Allan variance according to described time difference value, and result of calculation is deposited in described storer;
I, execution step c.
2. according to claim 1 pair of mixing time difference measurement method, is characterized in that, also includes following steps between described step h and described step I:
J, judge that whether the data of storing in described storer reach the upper limit of memory span, if so, perform step k; If not, perform step i;
K, delete the data before aligned position in described storer, remaining data is moved forward from described aligned position, perform step afterwards i.
3. according to claim 1 and 2 pair of mixing time difference measurement method, is characterized in that, also includes following steps between described step e and described step f:
L, judge in described the first counter, described the second counter, described the 3rd counter and described four-counter whether have data from overflow, if having data from overflow in arbitrary counter, perform step m; If equal data from overflow not in all counters, performs step f;
M, for the counter that has data from overflow, make the full value of cumulative this counter of counting variable wherein, perform step afterwards f.
4. two mixing time difference measurement systems, is characterized in that, comprise counting unit, latch units, single-chip microcomputer and storer; Described counting unit connects described latch units, and described latch units connects described single-chip microcomputer, and described single-chip microcomputer connects described storer;
Described counting unit comprises the first counter, the second counter, the 3rd counter and four-counter; Described latch units comprises the first latch, the second latch, the 3rd latch and quad latch; Described the first counter and described the first latch join, and described the second counter and described the second latch join, and described the 3rd counter and described the 3rd latch join, and described four-counter and described quad latch join;
Described the first counter and described the second counter be used for respectively Real-time Obtaining common source signal frequency counting and be converted to time counting;
Described the first latch carries out latch for the time counting value of in the time that the rising edge of reference signal arrives, current described the first counter being obtained;
Described the second latch carries out latch for the time counting value of in the time that the rising edge of measured signal arrives, current described the second counter being obtained;
Described the 3rd counter for counting the number of current described reference signal rising edge in the time that the rising edge of reference signal arrives;
Described four-counter for counting the number of current described measured signal rising edge in the time that the rising edge of measured signal arrives;
Described the 3rd latch for carrying out latch to the count results of current described the 3rd counter in the time that the rising edge of reference signal arrives;
Described quad latch for carrying out latch to the count results of current described four-counter in the time that the rising edge of measured signal arrives;
Described single-chip microcomputer comprises the first judging unit, data-reading unit, number alignment unit and computing unit;
Whether described the first judging unit arrives for the rising edge of real-time judge reference signal and measured signal;
Time counting value when described data-reading unit arrives for read the rising edge of reference signal and measured signal from described latch units and the rising edge number of reference signal and measured signal, and read data are deposited in described storer;
Described number alignment unit is alignd with the number of described measured signal rising edge for the number that makes described reference signal rising edge in described storer;
Described computing unit is used for extracting in described storer and described reference signal and described measured signal are alignd, and the corresponding time counting value of number is carried out calculation process, obtain time difference value, calculate frequency difference, differ and Allan variance according to described time difference value afterwards, and result of calculation is deposited in described storer.
5. according to claim 4 pair of mixing time difference measurement system, is characterized in that, described single-chip microcomputer also comprises that the second judging unit and data delete unit;
Described the second judging unit is for judging whether the data of storing in described storer reach the upper limit of memory span;
Described data delete that unit, for being to delete the data before aligned position in described storer while being in the judged result of described the second judging unit, makes remaining data move forward from described aligned position.
6. according to the two mixing time difference measurement systems described in claim 4 or 5, it is characterized in that, described single-chip microcomputer also comprises the 3rd judging unit and the cumulative unit of counting variable;
Described the 3rd judging unit is used for judging whether described the first counter, described the second counter, described the 3rd counter and described four-counter have data from overflow;
When there is data from overflow the cumulative unit of described counting variable for judging arbitrary counter at described the 3rd judging unit, make the full value of cumulative this counter of calculating variable in the counter of this overflow data.
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| CN112858780A (en) * | 2020-12-31 | 2021-05-28 | 广东大普通信技术有限公司 | Method, device and system for measuring crystal oscillation frequency |
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