CN102142952A - Method and device for accurately generating TDEV (Time Deviation) noise - Google Patents
Method and device for accurately generating TDEV (Time Deviation) noise Download PDFInfo
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- CN102142952A CN102142952A CN2010101050921A CN201010105092A CN102142952A CN 102142952 A CN102142952 A CN 102142952A CN 2010101050921 A CN2010101050921 A CN 2010101050921A CN 201010105092 A CN201010105092 A CN 201010105092A CN 102142952 A CN102142952 A CN 102142952A
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Abstract
The invention relates to a method and device for accurately generating TDEV (Time Deviation) noise. The method comprises the steps of: 1, selecting a TDEV noise template, and calculating a calibration coefficient of a noise amplitude of a frequency point corresponding to each observation time of the noise template; 2, determining a sample value frequency and an output threshold of generating the TDEV noise; 3, determining that the TDEV noise is generated by outputting to a file or a meter; and 4, when the TDEV noise is generated by outputting to the file, generating an original phase file consistent with the noise template according to the determined calibration coefficient, frequency and output threshold, and when the TDEV noise is generated by outputting to the meter, generating a phase modulation signal consistent with the noise template according to the determined calibration coefficient, frequency and output threshold. According to the invention, the TDEV noise according with the standard in China can be accurately generated, the defects in the prior art are remedied, and relevant tests are more accurate and credible.
Description
Technical field
The present invention relates to communication technology field of synchronization, particularly relate to the method and apparatus of accurate generation TDEV noise.
Background technology
Each significant instant of digital signal relatively its ideal time the position long the time depart from (cycle is lower than 10Hz) and be called drift.Drift adopts MTIE and two parameters of TDEV (time deviation) to describe.Wherein, TDEV changes with the time domain of the phase deviation ideal signal of mode by having showed given signal the time of integration of statistics, and it is defined as:
Wherein: X
iBe the data from the sample survey of time interval error, N is the sum of data from the sample survey, τ
0Be the time interval between adjacent sample value, τ is the time of integration, τ=n τ
0, n is the sampling number in the time of integration.
The TDEV noise can more truly reflect the truth of drifting about in the network, and TDEV noise template is used to weigh the ability that equipment clock bears drift noise.The TDEV template requires to be divided into G.812type II/III, ITU-T I etc. G.813Option of ITU-TG.812type I, ITU-T, and China only adopts G.812type I and ITU-T I G.813Option of ITU-T.And the ITU-T that existing instrument can only be applied to North America II/IIITDEV noise template G.812type can't produce the TDEV noise that is applied to China.Therefore, how producing the TDEV noise that is applicable to China is a very large challenge.
In addition, in common template class method of testing, for the requirement of template error be ± 20%, error has certain influence to the test result of equipment component producer.Therefore, need a kind of method and apparatus that can produce the signal consistent with TDEV template height.
Summary of the invention
At defective that exists in the prior art and deficiency, the objective of the invention is to propose a kind of method of accurate generation TDEV noise, comprising:
Step 1: select TDEV noise template, and calculate the calibration factor of the noise amplitude of described noise template each observing time of corresponding frequency;
Step 2: sample value frequency and the output thresholding of determining to produce the TDEV noise according to user's selection;
Step 3: determine that according to user's selection TDEV noise producing method is for outputing to file or outputing to instrument;
Step 4: described producing method is given birth to the original phase file consistent with described noise template according to above-mentioned definite described calibration factor, described sample value frequency, the limited production of described out gate when outputing to file;
Described producing method is given birth to and the consistent phase modulated signal of described noise template according to above-mentioned definite described calibration factor, described sample value frequency, the limited production of described out gate when outputing to instrument.
Preferred as technique scheme, described calibration factor are based on annealing algorithm and adopt repeatedly that iterative computation obtains.
Preferred as technique scheme, the sample value frequency of described TDEV noise is 50Hz or 18.2Hz.
Preferred as technique scheme, the scope of the output thresholding of described TDEV noise is 1ns to 100ns.
The present invention also proposes a kind of device of accurate generation TDEV noise, comprising:
Computing module is used to select TDEV noise template and calculates the calibration factor of the noise amplitude of described noise template each of corresponding frequency observing time;
Select module, be used for determining sample value frequency, output thresholding and the producing method of generation TDEV noise according to user's selection;
Produce the noise module, be used for when described producing method when outputing to file, according to above-mentioned definite described calibration factor, described sample value frequency, the described out gate life original phase file consistent of limiting the production with described noise template;
When described producing method when outputing to instrument, produce and give birth to and the consistent phase modulated signal of described noise template according to above-mentioned definite described calibration factor, described sample value frequency, the limited production of described out gate.
Preferred as technique scheme, the producing method of selecting when described selection module also comprise the phase modulated module when outputing to instrument, are used to produce and the consistent phase modulated signal of described noise template.
Preferred as technique scheme, the sample value frequency of described TDEV noise is 50Hz or 18.2Hz.
Preferred as technique scheme, the scope of the output thresholding of described TDEV noise is 1ns to 100ns.
Method and apparatus by the present invention proposes can produce the TDEV noise that meets China's standard exactly, has remedied the deficiency of existing instrument, and has made dependence test more accurately credible.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.For the person of ordinary skill in the field, from detailed description of the invention, above-mentioned and other purposes of the present invention, feature and advantage will be apparent.
Description of drawings
Fig. 1 is the schematic diagram of the preferred embodiment of the method for the accurate generation TDEV noise of the present invention's proposition;
Fig. 2 is the schematic diagram of the preferred embodiment of the device of the accurate generation TDEV noise of the present invention's proposition;
Fig. 3 is the TDEV curve chart of the test0.dat noise of employing method generation of the present invention;
Fig. 4 is the TDEV curve chart of test0.dat noise and the comparison schematic diagram of TDEV template;
Fig. 5 is the TDEV curve chart of the test1.dat noise of employing method generation of the present invention;
Fig. 6 is the TDEV curve chart of test1.dat noise and the comparison schematic diagram of TDEV template.
Embodiment
As shown in Figure 1, the method for the accurate generation TDEV noise of the present invention's proposition comprises:
Step 1: select TDEV noise template, and calculate the calibration factor of the noise amplitude of described noise template each observing time of corresponding frequency;
TDEV noise template has G.812type G.812type II/III, ITU-TG.813Option I etc. of I, ITU-T of ITU-T, and the noise amplitude of TDEV noise template each observing time of corresponding frequency need adopt specific calibration factor;
Step 2: sample value frequency and the output thresholding of determining to produce the TDEV noise according to user's selection;
Different according to the difference of producing method and instrument control ability, the frequency that the sample value of TDEV noise produces can be 50Hz or 18.2Hz.Wherein, the sample value frequency is high more, and the error that produces the TDEV noise is more little; According to the difference of application scenario, the sample value of TDEV noise output thresholding can manually be set to 1ns～100ns.Sample value is exported the high more of threshold setting, and the error that produces the TDEV noise is more little;
Step 3: determine that according to user's selection TDEV noise producing method is for outputing to file or outputing to instrument;
Step 41: described producing method is given birth to the original phase file consistent with described noise template according to above-mentioned definite described calibration factor, described sample value frequency, the limited production of described out gate when outputing to file;
Step 42: described producing method is given birth to and the consistent phase modulated signal of described noise template according to above-mentioned definite described calibration factor, described sample value frequency, the limited production of described out gate when outputing to instrument.
Calibration factor in the above-mentioned steps 1 is based on annealing algorithm and adopts repeatedly iterative computation to obtain.
The sample value frequency that produces the TDEV noise can be 50Hz or 18.2Hz.
The scope of the output thresholding of the TDEV noise that produces is 1ns to 100ns.
As shown in Figure 2, the device of accurate generation TDEV noise of the present invention comprises:
Select module 202, be used for determining sample value frequency, output thresholding and the producing method of generation TDEV noise according to user's selection;
Produce noise module 203, be used for described producing method when outputing to file, according to above-mentioned definite described calibration factor, described sample value frequency, the described out gate limited production life original phase file consistent with described noise template;
Described producing method is produced and is given birth to and the consistent phase modulated signal of described noise template according to above-mentioned definite described calibration factor, described sample value frequency, the limited production of described out gate when outputing to instrument.
The producing method of selecting when described selection module also comprises the phase modulated module, generation and the consistent phase modulated signal of described noise template when outputing to instrument.Usually adopt the frequency synthesis instrument to realize.
The sample value frequency of described TDEV noise is 50Hz or 18.2Hz.
The scope of the output thresholding of described TDEV noise is 1ns to 100ns.
Below be the specific embodiment of the inventive method:
Step 1: the calibration factor of determining TDEV noise template and each bin magnitudes.
Determine to produce G.812type I template of ITU-T.The noise amplitude of TDEV template each observing time of corresponding frequency need adopt specific calibration factor, and this coefficient is based on annealing algorithm and adopts repeatedly iterative computation to obtain.
Step 2: determine that sample value produces frequency and sample value output thresholding.
Determine that the frequency that sample value produces is 50Hz and 18.2Hz, sample value output thresholding is 100ns.
Step 4: output to file (test0.dat and test1.dat), produce 120000 seconds original phase data.
The TDEV curve of the test0.dat that calculate to produce as shown in Figure 3, with TDEV template comparative result as shown in Figure 4: the range error scope of each observing time is-5.3%～2.5%, and mean error is-1.25%, and standard variance is 1.78%.
The TDEV curve of the test1.dat that calculate to produce as shown in Figure 5, with TDEV template comparative result as shown in Figure 6: the range error scope of each observing time is-5.3%～4.3%, and mean error is-1.07%, and standard variance is 2.05%.
By the foregoing description as can be seen, the calibration factor that various TDEV templates are calculated each bin magnitudes is taken all factors into consideration in utilization of the present invention, determine control frequency and modulation amplitude, the instrument that employing has the phase modulated function produces and the consistent signal of TDEV template height, remedy the deficiency of existing instrument, and make dependence test more accurately credible.
Though; the present invention clearly demonstrates by above embodiment and accompanying drawing thereof; yet under the situation that does not deviate from spirit of the present invention and essence thereof; the person of ordinary skill in the field works as can make various corresponding variations and correction according to the present invention, but these corresponding variations and correction all should belong to the protection range of claim of the present invention.
Claims (8)
1. a method that accurately produces the TDEV noise is characterized in that, comprising:
Step 1: select TDEV noise template, and calculate the calibration factor of the noise amplitude of described noise template each observing time of corresponding frequency;
Step 2: sample value frequency and the output thresholding of determining to produce the TDEV noise according to user's selection;
Step 3: determine that according to user's selection TDEV noise producing method is for outputing to file or outputing to instrument;
Step 4: described producing method is given birth to the original phase file consistent with described noise template according to above-mentioned definite described calibration factor, described sample value frequency, the limited production of described out gate when outputing to file;
Described producing method is given birth to and the consistent phase modulated signal of described noise template according to above-mentioned definite described calibration factor, described sample value frequency, the limited production of described out gate when outputing to instrument.
2. method according to claim 1 is characterized in that, described calibration factor is based on annealing algorithm and adopts repeatedly that iterative computation obtains.
3. method according to claim 1 is characterized in that, the sample value frequency of described TDEV noise is 50Hz or 18.2Hz.
4. method according to claim 1 is characterized in that, the scope of the output thresholding of described TDEV noise is 1ns to 100ns.
5. device that accurately produces the TDEV noise is characterized in that described device comprises:
Computing module is used to select TDEV noise template and calculates the calibration factor of the noise amplitude of described noise template each of corresponding frequency observing time;
Select module, be used for determining sample value frequency, output thresholding and the producing method of generation TDEV noise according to user's selection;
Produce the noise module, be used for when described producing method when outputing to file, according to above-mentioned definite described calibration factor, described sample value frequency, the described out gate life original phase file consistent of limiting the production with described noise template;
When described producing method when outputing to instrument, produce and give birth to and the consistent phase modulated signal of described noise template according to above-mentioned definite described calibration factor, described sample value frequency, the limited production of described out gate.
6. device according to claim 5 is characterized in that, the producing method of selecting when described selection module also comprises the phase modulated module when outputing to instrument, is used to produce and the consistent phase modulated signal of described noise template.
7. device according to claim 5 is characterized in that, the sample value frequency of described TDEV noise is 50Hz or 18.2Hz.
8. device according to claim 5 is characterized in that, the scope of the output thresholding of described TDEV noise is 1ns to 100ns.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678291A (en) * | 2015-02-10 | 2015-06-03 | 电信科学技术第五研究所 | Automatic performance test platform for digital synchronization network node clock devices |
| CN111130681A (en) * | 2019-12-10 | 2020-05-08 | 中国信息通信研究院 | Method and device for determining noise transfer characteristics |
| CN117318872A (en) * | 2023-11-30 | 2023-12-29 | 中国信息通信研究院 | TDEV time domain noise generation method and device |
-
2010
- 2010-02-02 CN CN2010101050921A patent/CN102142952A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678291A (en) * | 2015-02-10 | 2015-06-03 | 电信科学技术第五研究所 | Automatic performance test platform for digital synchronization network node clock devices |
| CN111130681A (en) * | 2019-12-10 | 2020-05-08 | 中国信息通信研究院 | Method and device for determining noise transfer characteristics |
| CN111130681B (en) * | 2019-12-10 | 2021-10-08 | 中国信息通信研究院 | Method and device for determining noise transfer characteristics |
| CN117318872A (en) * | 2023-11-30 | 2023-12-29 | 中国信息通信研究院 | TDEV time domain noise generation method and device |
| CN117318872B (en) * | 2023-11-30 | 2024-03-29 | 中国信息通信研究院 | TDEV time domain noise generation method and device |
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Application publication date: 20110803 |