CN104391175A - Frequency measurement system capable of realizing wide frequency range disclosure and phase information keeping as well as frequency measurement method thereof - Google Patents
Frequency measurement system capable of realizing wide frequency range disclosure and phase information keeping as well as frequency measurement method thereof Download PDFInfo
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Abstract
The invention discloses a frequency measurement system capable of realizing wide frequency range disclosure and phase information keeping as well as a frequency measurement method. The frequency measurement method comprises steps as follows: (1) converting a reference signal and a to-be-measured signal into signals with the simple integer multiple and a certain frequency difference relation; (2) sending the reference signal and the to-be-measured signal into a phase coincidence detection circuit to obtain a phase coincidence cluster of the reference signal and the to-be-measured signal; (3) when edge information of the phase coincidence cluster is detected, performing counting and value obtaining on the reference signal and the to-be-measured signal respectively, and obtaining a measurement gate according to the difference between two adjacent values; (4) meanwhile, setting a virtual nominal frequency signal identical with the to-be-measured signal in frequency nominal, so that the continuous change characteristic of the phase of the to-be-measured signal is recorded and disclosed while the to-be-measured signal is measured continuously. According to the frequency measurement system and the frequency measurement method thereof, high-resolution continuous frequency measurement can be performed within a wider frequency range, and the phase change information of the to-be-measured frequency signal can be disclosed and kept during measurement.
Description
Technical Field
The invention relates to a frequency measurement system with wide frequency range revealing and phase information keeping function and a frequency measurement method thereof, belonging to the field of time frequency measurement technology and control, and the application of the frequency measurement system comprises quite wide fields of test metering and frequency scale technology, communication, instruments and meters, navigation positioning, electronic engineering and the like.
Background
The development of modern science and technology is based on the precision experimental measurement, and the time and frequency quantities have the highest precision and stability in all physical quantities, so that the method has very obvious significance and influence on the establishment and accurate measurement of the standard. Among them, the time and frequency measurement technology is widely used in navigation, space technology, communication, industrial production, traffic, scientific research, astronomy and metrology, and is well known to people as industrial control, information transmission and processing, modern digitization technology and computer.
The rapid development of the information industry in modern society has higher and higher requirements on information transmission and processing, and higher-accuracy time-frequency reference and more precise measurement technology are required. With the increasing use of various frequency sources, higher and higher requirements are put on the establishment, improvement and measurement methods and measurement techniques of various base standards. Especially, the development of space technology in recent years puts higher demands on the processing of time-frequency signals. In many time-frequency measurement and control methods, phase comparison often can obtain the precision in measurement and control, relative resolution index higher in long-term accumulation and the like, however, the method is only suitable for comparing two frequency signals with the same frequency nominal value or simple linear relation, and the measured frequency range is sharply narrowed along with the improvement of resolution, so that the method is not suitable for measuring the frequency of signals with wide range and two complex relations.
From conventional approaches, frequency measurements do not reveal phase information, especially for any frequency signal where the phase information is continuously changing over time. In a common frequency measurement method, a counter has interval sampling and does not have the capacity of retaining phase information; the high-resolution frequency measurement selects fixed gate time measurement, and simultaneously carries out high-resolution measurement on short-time signals in which the gate and the counting signal are not synchronous, but the measurement and the processing of the part occupy extra time and are not beneficial to the retention of phase information. In the case of frequencies of a wide variety and complex objects to be measured, the conventional practice requires a large number of frequency conversion circuits for the purpose of measurement, which introduce unnecessary phase noise and increase the complexity of the measuring apparatus.
The invention of the frequency measurement method with wide frequency range revealing and maintaining phase information can fundamentally improve the existing levels of time-frequency measurement and control technology, IT technology and the like and can greatly change the structure of the existing measurement equipment; the method for measuring the frequency in the wide frequency range and revealing the phase information of any measured signal can realize more precise measurement and processing in the wide measurement and control field, realize the function of frequency control which can be carried out only after complex frequency conversion, and well solve the frequency processing and control problems which are difficult to realize; the fields related to the method comprise test measurement, frequency scale technology, astronomy, communication, electronic engineering, scientific instruments, navigation positioning and the like. Therefore, the research on the frequency measurement approach with the function of maintaining the phase information has more practical significance and value, and meanwhile, the effective utilization of a new theory to realize the high-resolution time frequency measurement control technology is important work with wide influence.
One typical application of frequency measurement methods with wide frequency range revealing and maintaining phase information is the improvement of the phase-locked loop circuitry of the internal structure of an atomic clock. A large number of complex frequency change circuits are arranged in a traditional atomic clock, so that the traditional atomic clock is complex in structure, large in size and not beneficial to the development trend of miniaturization, high stability, low phase noise and low power consumption.
Disclosure of Invention
The invention provides a frequency measurement system with wide frequency range revealing and phase information keeping functions and a frequency measurement method thereof, and mainly solves the problems that the traditional frequency measurement method cannot meet the requirements of accurate measurement in a wide frequency range and has complex circuits. The complex frequency measurement method with the function of maintaining the phase information can construct a novel phase-locked loop, can well solve the problems of the traditional atomic clock by utilizing the novel phase-locked loop, can greatly improve the frequency stability, the phase noise and the volume, has the advantages of high measurement resolution, wide measurement range and the like, is particularly embodied in the aspects of realizing the disclosure and measurement of the phase information and the change of the phase information of a measured signal, popularizes the advantage of phase processing to an arbitrary wide frequency range, and shows remarkable value for numerous application fields, which is not possessed by the traditional measurement method.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a frequency measurement system with wide frequency range revealing and retaining phase information comprises a reference signal frAnd the measured signal fxThe phase coincidence detection circuit comprises a first conditioning conversion circuit and a second conditioning conversion circuit which are connected at output ends, a phase coincidence detection circuit which is connected with the output ends of the first conditioning conversion circuit and the second conditioning conversion circuit, a line and a MCU which are connected with the output end of the phase coincidence detection circuit after being sequentially connected, a first counter and a second counter which are connected with the line and are connected with the gate, and a reference signal f detected by the phase coincidence detection circuitrAnd the measured signal fxAnd respectively taking the data when the edge information of the phase coincidence cluster exists.
Specifically, the first conditioning conversion circuit comprises a reference signal frThe output end of the first shaping circuit is connected with the first signal conditioning circuit; the second conditioning conversion circuit comprises a second conditioning conversion circuit and a measured signal fxThe output end of the second shaping circuit is connected with the first signal conditioning circuit; and the first signal conditioning circuit and the second signal conditioning circuit are simultaneously connected with the phase coincidence detection circuit.
The frequency measuring method of the frequency measuring system with wide frequency range revealing and maintaining phase information comprises the following steps:
(1) reference signal frAnd the measured signal fxRespectively passing through respective conditioning conversion circuits to make reference signal frAnd the measured signal fxThe relation of (1) is a simple integer multiple and has a certain frequency difference;
(2) sending the modulated reference signal and the detected signal into a phase coincidence detection circuit to obtain a phase coincidence cluster of the modulated reference signal and the detected signal;
(3) when the edge information of the phase coincidence cluster is detected, the count values of a first counter and a second counter are respectively taken, wherein the first counter is frCounting, the second counter pair fxCounting, calculating the measuring gate time tau according to the difference value of two adjacent values and the corresponding periodiI.e. by
τi＝(Nx(i)-Nx(i-1))Txi＝(Nr(i)-Nr(i-1))Tr；
(4) Setting a virtual and measured signal f simultaneouslyxOf a nominal frequency signal f of the same nominal frequencyx nominal scaleThe nominal frequency signal f is converted intox nominal scaleAnd the measured signal fxPerforming continuous gapless comparison by using fxAnd fx nominal scaleIs reflected in the measuring gate tauiInternal measured signal fxAnd fx nominal scaleOf phase difference, i.e.
Specifically, the specific implementation method of step (3) is as follows: in a given reference gate, when the coincidence detection line detects the reference signal frAnd the measured signal fxWhen the edge information of the phase coincidence cluster is obtained, the gate generating circuit triggers the MCU to take the number value of the counter, and the measured gate time tau is calculated according to the difference value of two adjacent values and the corresponding periodi。
Further, the nominal frequency signal fx nominal scaleAnd the measured signal fxThe continuous gapless comparison requires maintaining and memorizing the nominal frequency signal fx nominal scaleAt the current gate time τiPhase information at the start, i.e. phase difference information at the end of the previous gateThereby the measured signal f can be shown at the two ends of the gatexAnd signFrequency signal fx nominal scaleThe phase relationship between them.
Further, said utilizing fxAnd fx nominal scaleIs reflected in the measuring gate tauiInternal measured signal fxAnd fx nominal scaleSimultaneously recording and revealing the measured signal fxThe phase change characteristic of (2) is realized by the following method:
(41) at a measuring gate tauiInternally, the measured signal f is calculatedxWith a nominal frequency signal fx nominal scalePart of phase difference ofCalculate the correspondence tiTotal phase difference accumulation t at timei(θ)；
(42) Calculating f within any measuring time according to the detected phase difference partxAnd fx nominal scaleIs detected by the frequency difference Δ f.
Still further, the specific calculation process of the step (41) is as follows:
let reference signal be frThe measured signal is fxNominal frequency signal of fx nominal scaleTaking value N according to the count of the counterr1，Nr2…Nri；Nx1，Nx2…NxiCan calculate the measuring gate taui：
τi＝(Nx(i)-Nx(i-1))Txi＝(Nr(i)-Nr(i-1))Tr
Wherein (N)x(i)-Nx(i-1)) And (N)r(i)-Nr(i-1)) Respectively representing the measured signals f in the measuring gatexAnd a reference signal frNumber of periods of (1), TxRepresenting the measured signal f in the measurement gatexAnd the period of actual measurement of TxCorresponding, nominal frequency signal fx nominal scaleAnd the measured signal fxIs as follows：
…
At corresponding to tiTotal phase difference accumulation t at timei(theta) less than one cycle, Nx nominal (i)Value of (A) and (N)r(i)-Nr(i-1)) Equality can be calculated fromi＝1,2…；
ti(theta) withIs as follows (t)iIncludes t in (theta)i-1Total phase difference sum of time tauiInternal phase difference
And also
Thus, ti(theta) is a seriesAccumulated value of
Thereby obtaining a phase difference accumulation ti(θ)。
Still further, the calculation formula of Δ f in step (42) is as follows:
where Δ f is within any gate fxAnd fx nominal scaleFrequency difference of f0Is the signal f under testxI.e. a virtual nominal frequency signal fx nominal scaleIs the measurement time, and Δ T is the cumulative phase difference change of the comparison signal over the measurement time.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention proposes a method for performing high-resolution frequency measurements over a wide frequency range, the frequency measurement technology capable of revealing and maintaining the phase change information of the measured frequency signal is completely different from the traditional frequency measurement technology, and actually combines the characteristic of wide frequency range of frequency measurement with the characteristic of phase comparison which can only be carried out under the condition of the same frequency nominal value and can realize phase processing and phase information measurement and greatly improve the measurement precision along with the accumulation of time, realizes intuitive phase measurement comparison between signals with any frequency in principle, simultaneously records the phase information of the detected signals without gaps and can reveal the phase information of the detected signals, the method has important significance in the technical field of frequency control and comparison in a wide frequency range and frequency scaling.
(2) The invention makes the reference signal and the measured signal form a simple frequency relation through a conditioning conversion circuit, then sends the reference signal and the measured signal into a phase coincidence detection circuit, obtains a high-precision phase coincidence cluster by utilizing the stability of the resolution of a coincidence detection circuit, sets a virtual nominal frequency signal which is completely the same as the nominal frequency value of the measured signal, and mutually determines the phase shift between the measured signal and the nominal frequency signal every time a comparison period passes, thereby realizing the continuous and uninterrupted measurement of the phase and simultaneously recording and revealing the continuous change characteristic of the phase of the measured signal.
(3) The invention realizes high-precision phase control without complex frequency conversion, thus the invention can generate fundamental technical promotion function for occasions with high requirements on frequency precision in the fields of frequency standard technology, test metering, instrument and meter technology, communication, electronic engineering, military industry and the like.
Drawings
FIG. 1 is a block diagram of the system of the present invention.
FIG. 2 is a waveform of phase accumulation for continuous and uninterrupted measurement according to the present invention.
FIG. 3 is a waveform illustrating the cumulative phase problem of the ith gate time in continuous uninterrupted measurement according to the present invention.
FIG. 4 shows the invention for fxAnd fx standardAnd fixing the frequency difference, and reflecting the phase change curve of the frequency signal by using the experimental result.
Detailed Description
The present invention is further illustrated by the following figures and examples, which include, but are not limited to, the following examples.
Examples
As shown in FIGS. 1 to 4, a frequency measurement system with wide frequency range for revealing and maintaining phase information includes a reference signal frA first shaping circuit connected with the output end of the first shaping circuit, a first signal conditioning circuit connected with the output end of the first shaping circuit, and a measured signal fxThe output end of the first shaping circuit is connected with the output end of the second shaping circuit, the second signal conditioning circuit is connected with the output end of the second shaping circuit, the phase coincidence detection circuit is connected with the output ends of the first signal conditioning circuit and the second signal conditioning circuit, the circuit and the MCU are generated when the output ends of the first signal conditioning circuit and the second signal conditioning circuit are connected with the output end of the phase coincidence detection circuit after being connected in sequence, the first counter and the second counter are connected with the gate simultaneously, the circuit connection is generated when the first counter and the second counter are connected with the gate simultaneously, and the phase coincidence detection circuit detects the reference signal frAnd the measured signal fxAnd respectively taking the data when the edge information of the phase coincidence cluster exists.
The working principle of the system is as follows: reference signal frAnd the measured signal fxThe reference signal and the measured signal are sent to a phase coincidence detection circuit, and a high-precision phase coincidence cluster is obtained by utilizing the stability of the resolution of a coincidence detection circuit; when the edge information of the phase coincidence cluster is detected, the generation circuit sends a data acquisition signal to the MCU during gating, so that the first counter and the second counter are controlled to count and take values and are stored, and the measuring gate tau can be obtained according to the difference value of two adjacent values of the countersi(ii) a Without the gate in the figure, the selective (close to the desired gate length) phase coincidence information is used to control the taking of consecutive counts at this time. The difference between the two values is thus exactly the measurement gate to be constructed, and the gate is thus not overtThere is no space between the gate and the gate. The values counted by the counter need not be kept all the way through, and the historical count data can be cleared after the corresponding phase information is revealed for each frequency value.
The invention not only eliminates the quantization error of plus or minus one number, but also realizes the continuous and uninterrupted measurement of the phase information of the measured signal. Specific reference signal is frThe measured signal is fxThe count values are respectively Nr、NxThen, the frequency of the detected signal is calculated according to the following formula 1.1:
the invention also sets a virtual nominal frequency signal f identical to the nominal frequency of the signal to be measuredx nominal scale(having a period of Tx nominal scale). Measured signal fxAnd a nominal frequency signal fx nominal scaleThe comparison between the two signals is gapless, the phase state between the two compared signals is always fixed before and after each comparison period, and for a virtual nominal frequency signal, the measured signals are mutually determined phase shifts each time one comparison period passes. By using the method, the phase information of the detected signal can be continuously reserved, and the process needs to always maintain and memorize Tx nominal scaleThe phase information at the beginning of the measuring gate, i.e. at the end of the last measuring gate, must therefore be continuous.
As shown in fig. 2 (the diagram shows the corresponding measurement gate inner fx＞fx nominal scaleCondition (f) ofx＜fx nominal scaleSimilar thereto, except that the signs of some of the parameters change), which includes 3 wave curves, respectively reference signal frMeasured signal fxNominal frequency signal fx nominal scaleThe measured signal, the reference signal and the measuring gate respectively realize multi-period synchronization; the nominal frequency signal is a virtual signal which is set to be exactly the same as the nominal value of the measured frequency signal in order to reveal the phase information of the measured signal, so that the phase relation between the measured signal and the virtual waveform signal can be shown at the two ends of the gate, and the phase change is accumulated.
Comparing the reference signal with the measured signal to obtain the measuring gate tau which changes along with the small changes of the frequency and the phase of the measured signaliOf the magnitude of the reference signal frThe calculation formula of the multi-period value is shown in formula 1.2:
τi＝(Nx(i)-Nx(i-1))Txi＝(Nr(i)-Nr(i-1))Tr (1.2)
wherein (N)x(i)-Nx(i-1)) And (N)r(i)-Nr(i-1)) Respectively representing the number of periods, T, of the measured signal and the reference signal in the measurement gatexIndicating the period of the signal measured in the measurement gate, and the actual measured TxAnd correspondingly.
The MCU stores the reading N of the two counters at the phase coincidence pointr1，Nr2…Nri(ii) a And Nx1，Nx2…Nxi. Using these values, τ can be obtained1，τ2，τ3… and fx1，fx2，fx3…fxiThe calculation formula of (a) is shown in formula 1.2.1:
wherein i is 1,2,3 …, and f is obtained after certain data processingxSuch fxThe accuracy and other indexes are greatly improved.
In practical application, however, fxIn the presence of frequency drift, in any gate fxAnd fx nominal scaleThe sign and magnitude of the frequency difference Δ f are uncertain, and thus the variation rule of t (θ) is complex. The phase information of the signal retained during the measurement is measured by the value T measured for the virtual nominal frequency signalx nominal scaleTo see TxThe relationship between them with respect to their phase changes and differences can be expressed as in equation 1.3:
…
wherein,is a corresponding measuring gate tauiInternal measured signal and virtual nominal frequency signal fx nominal scaleThe phase difference part of (2). N is a radical ofx nominal (1)，Nx nominal (2)Is shown in FIGS. 2 and 3, and generally T (θ) < Tx nominal scaleLet Δ f be fx-fx nominal scale0 (the same applies for Δ f < 0, except that the sign of some of the parameters changes). At T (theta) < Tx nominal scale(t (θ) varies less than one cycle), Nx nominal (i)Is the same as that in the corresponding measurement gate fxAre equal in count value, i.e. Nx nominal (i)＝Nx(i)-Nx(i-1)。
T in the figurei(theta) represents the correspondence tiThe total phase of the time instants is accumulated, which includes ti-1Phase integration at time instant τiThe phase difference occurring in the gate is expressed by the following equation 1.4:
and also
Thus, ti(theta) is a seriesThe accumulated value of (1).
i＝1,2,3…。
At tauiTime TxAnd TrAre synchronized according to a group period, and TxAnd Tx nominal scaleThen there is no synchronization relationship and therefore for TxAnd Tx nominal scaleAt each measuring gate tauiThere will be a phase accumulated difference part in timeNamely the phase difference between the measured signal and the nominal frequency signal, but the measured signal is inverted to the measured signal, and the following information is obtained in parallel in the time flow of measurement through continuous and uninterrupted measurement: tau is1，τ2，τ3…τn；t1(θ)，t2(θ)，t3(θ)…tn(theta) andetc., i.e. not exactly the same continuous extension of the alignment time corresponds to a perceptible phase fluctuation.
Measured signal fxAnd a reference signal frThe comparison between the two signals is gapless, in the comparison process, the measurement is always carried out by uninterruptedly opening and closing the door by group phase coincidence between the two signals, namely, no explicit gate is arranged in the measurement, the counting is continuous, the numerical value of the counter is taken at the edge information of the phase coincidence cluster, and a useful difference value is obtained, so that the continuous and uninterrupted measurement of the frequency is realized by the method. The realization of this function extends the relationship between phase change and relative frequency difference to the complex frequency domain. The relationship between the phase change and the relative frequency difference is shown in equation 1.5:
where Δ f is f within any measurement timexAnd fx nominal scaleFrequency difference of f0Is the nominal frequency of the signal under test, i.e. the nominal frequency signal fx nominal scaleIs the measurement time, and Δ T is the cumulative phase difference of the comparison signals over the measurement time. In the conventional method, this formula is often used for calculating the frequency difference and the frequency stability between two same nominal frequency signals. After the continuously changing phase characteristics of the detected signal are recorded and revealed by the method, the formula can be applied to the comparison between two arbitrary frequencies. From the formula, it can be seen that the measurement accuracy of the frequency quantity is greatly improved along with the extension of the comparison time.
The invention provides a frequency measurement technology which can not only carry out high-resolution frequency measurement in a wide frequency range, but also can reveal and maintain the phase change information of a measured frequency signal. This is completely different from conventional frequency measurement techniques. The method and the device have the advantages that the characteristics of wide frequency range of frequency measurement and the characteristics of phase processing, phase information measurement and great improvement of measurement accuracy along with time accumulation of a phase comparison technology which can carry out phase comparison only under the condition of the same frequency nominal value are well combined, intuitive phase measurement comparison among any frequency signals is realized in principle, meanwhile, the phase information of the measured signals is recorded without gaps, the phase information of the measured signals can be revealed, and the method and the device have important significance in the technical fields of frequency control and comparison in the wide frequency range and frequency scaling. Table 1 shows the advantages and disadvantages of the improved phase coincidence detection method of the present invention compared to other methods.
TABLE 1
| Measuring method | Resolution ratio | Ability to maintain phase | Measuring range |
| Direct counting | Is low in | Is free of | Width of |
| Interpolation techniques | Medium-high | None-low | Width of |
| Phase comparison | Height of | Good taste | Narrow and narrow |
| Generic phase coincidence detection | Is higher than | Is free of | Is wider |
| Improved phase coincidence detection | Height of | Good taste | Width of |
Table 2 shows the data of the experimental results of the mutual comparison of two different frequency sources, wherein the reference frequency fx10MHz, virtual nominal frequency signal fx nominal scale8220111Hz, nominal period 121.65ns, Nx，NrRespectively representCount values of measured and reference signals in different measurement gates, fxIn order to be able to actually measure the signal,for individual measurement of the gate position and nominal frequency fx nominal scaleAre calculated by derivation, respectively.
TABLE 2
The invention is well implemented in accordance with the above-described embodiments. It should be noted that, based on the above structural design, in order to solve the same technical problems, even if some insubstantial modifications or colorings are made on the present invention, the adopted technical solution is still the same as the present invention, and therefore, the technical solution should be within the protection scope of the present invention.
Claims (8)
1. Frequency measurement system with wide frequency range revealing and retaining phase information, characterized in that it comprises means for associating with a reference signal frAnd the measured signal fxThe circuit comprises a first conditioning conversion circuit and a second conditioning conversion circuit which are connected at output ends, a phase coincidence detection circuit which is connected with the output ends of the first conditioning conversion circuit and the second conditioning conversion circuit, a circuit and a MCU which are generated when a door connected with the output end of the phase coincidence detection circuit is connected in sequence, and a first counter and a second counter which are generated when the door is connected simultaneouslyLine connection for detecting reference signal f by phase coincidence detection circuitrAnd the measured signal fxAnd respectively taking the data when the edge information of the phase coincidence cluster exists.
2. The frequency measurement system of claim 1, wherein the first conditioning converter circuit comprises a reference signal frThe output end of the first shaping circuit is connected with the first signal conditioning circuit; the second conditioning conversion circuit comprises a second conditioning conversion circuit and a measured signal fxThe output end of the second shaping circuit is connected with the first signal conditioning circuit; and the first signal conditioning circuit and the second signal conditioning circuit are simultaneously connected with the phase coincidence detection circuit.
3. The method for frequency measurement of a frequency measurement system with wide frequency range revealing and maintaining phase information according to claim 1 or 2, comprising the steps of:
(1) reference signal frAnd the measured signal fxRespectively passing through respective conditioning conversion circuits to make reference signal frAnd the measured signal fxThe relation of (1) is a simple integer multiple and has a certain frequency difference;
(2) sending the modulated reference signal and the detected signal into a phase coincidence detection circuit to obtain a phase coincidence cluster of the modulated reference signal and the detected signal;
(3) when the edge information of the phase coincidence cluster is detected, the count values of a first counter and a second counter are respectively taken, wherein the first counter is frCounting, the second counter pair fxCounting, calculating the measuring gate time tau according to the difference value of two adjacent values and the corresponding periodiI.e. by
τi＝(Nx(i)-Nx(i-1))Txi＝(Nr(i)-Nr(i-1))Tr；
(4) Setting a virtual and measured signal f simultaneouslyxIs the same as the nominal frequencyOf a nominal frequency signal fx nominal scaleThe nominal frequency signal f is converted intox nominal scaleAnd the measured signal fxPerforming continuous gapless comparison by using fxAnd fx nominal scaleIs reflected in the measuring gate tauiInternal measured signal fxAnd fx nominal scaleOf phase difference, i.e.
4. The method for measuring frequency of a frequency measuring system with wide frequency range revealing and maintaining phase information as claimed in claim 3, wherein the step (3) is implemented by: in a given reference gate, when the coincidence detection line detects the reference signal frAnd the measured signal fxWhen the edge information of the phase coincidence cluster is obtained, the gate generating circuit triggers the MCU to take the number value of the counter, and the measured gate time tau is calculated according to the difference value of two adjacent values and the corresponding periodi。
5. A method for frequency measurement in a frequency measurement system with wide frequency range revealing and retaining phase information according to claim 3, characterized in that said nominal frequency signal fx nominal scaleAnd the measured signal fxThe continuous gapless comparison requires maintaining and memorizing the nominal frequency signal fx nominal scaleAt the current gate time τiPhase information at the start, i.e. phase difference information at the end of the previous gateThereby the measured signal f can be shown at the two ends of the gatexWith a nominal frequency signal fx nominal scaleThe phase relationship between them.
6. The method of claim 5, wherein the using f is performed by using fxAnd fx nominal scaleIs reflected in the measuring gate tauiInternal measured signal fxAnd fx nominal scaleSimultaneously recording and revealing the measured signal fxThe phase change characteristic of (2) is realized by the following method:
(41) at a measuring gate tauiInternally, the measured signal f is calculatedxWith a nominal frequency signal fx nominal scalePart of phase difference ofCalculate the correspondence tiTotal phase difference accumulation t at timei(θ)；
(42) Calculating f within any measuring time according to the detected phase difference partxAnd fx nominal scaleIs detected by the frequency difference Δ f.
7. The method for frequency measurement of a frequency measurement system with wide frequency range revealing and maintaining phase information of claim 6, wherein the specific calculation process of the step (41) is as follows:
let reference signal be frThe measured signal is fxNominal frequency signal of fx nominal scaleTaking value N according to the count of the counterr1，Nr2…Nri；Nx1，Nx2…NxiCan calculate the measuring gate taui：
τi＝(Nx(i)-Nx(i-1))Txi＝(Nr(i)-Nr(i-1))Tr
Wherein (N)x(i)-Nx(i-1)) And (N)r(i)-Nr(i-1)) Respectively representing the measured signals f in the measuring gatexAnd a reference signal frNumber of periods of (1), TxRepresenting the measured signal f in the measurement gatexAnd the period of actual measurement of TxCorresponding, nominal frequency signal fx nominal scaleAnd the measured signal fxThe relationship of (a) to (b) is as follows:
…
at corresponding to tiTotal phase difference accumulation t at timei(theta) less than one cycle, Nx nominal (i)Value of (A) and (N)r(i)-Nr(i-1)) Equality can be calculated fromi＝1,2…；
ti(theta) withIs as follows (t)iIncludes t in (theta)i-1Total phase difference sum of time tauiInternal phase difference)：
And also
Thus, ti(theta) is a seriesAccumulated value of
Thereby obtaining a phase difference accumulation ti(θ)。
8. The method for frequency measurement of a frequency measurement system with wide frequency range revealing and retaining phase information of claim 7, wherein Δ f in said step (42) is calculated as follows:
in the formula, delta f is within any gate fxAnd fx nominal scaleFrequency difference of f0Is the signal f under testxI.e. a virtual nominal frequency signal fx nominal scaleIs the measurement time, and Δ T is the cumulative phase difference change of the comparison signal over the measurement time.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106209084A (en) * | 2015-05-29 | 2016-12-07 | 硅谷实验室公司 | Two-way timing jitter or drift eliminate |
| CN111103456A (en) * | 2019-12-30 | 2020-05-05 | 四川锐智电气科技有限公司 | Frequency measurement method and device for locomotive control system |
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