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Method and device for accurately generating TDEV (Time Deviation) noise

A noisy and accurate technology, used in synchronization devices, digital transmission systems, electrical components, etc., can solve problems such as the influence of equipment manufacturers' test results and the inability to generate TDEV noise.

Inactive Publication Date: 2011-08-03
THE RES INST OF TELECOMM TRANSMISSION MIIT
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  • Application Information

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Problems solved by technology

However, the existing instrument can only be applied to the ITU-T G.812type II / III TDEV noise template in North America, and cannot generate the TDEV noise applied in my country
Therefore, how to generate TDEV noise suitable for our country is a very big challenge
[0006] In addition, in the usual template test methods, the requirement for the template error is ±20%, and the error has a certain impact on the test results of some equipment manufacturers

Method used

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  • Method and device for accurately generating TDEV (Time Deviation) noise
  • Method and device for accurately generating TDEV (Time Deviation) noise
  • Method and device for accurately generating TDEV (Time Deviation) noise

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specific Embodiment

[0052] Step 1: Determine the calibration coefficient of the TDEV noise template and the amplitude of each frequency point.

[0053] Make sure to generate the ITU-T G.812type I template. The noise amplitude of the frequency points corresponding to each observation time of the TDEV template needs to adopt a specific calibration coefficient, which is calculated based on the annealing algorithm using multiple iterations.

[0054] Step 2: Determine the sample value generation frequency and the sample value output threshold.

[0055] It is determined that the frequency of sample value generation is 50Hz and 18.2Hz, and the sample value output threshold is 100ns.

[0056]Step 3, determine that the TDEV noise generation method is to output to a file.

[0057] Step 4: Output to files (test0.dat and test1.dat), resulting in 120000 seconds of raw phase data.

[0058] The TDEV curve of test0.dat generated by calculation is as follows image 3 As shown, the comparison result with the T...

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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 [0001] The invention relates to the field of communication technology synchronization, in particular to a method and a device for accurately generating TDEV noise. Background technique [0002] The long-term deviation (period lower than 10Hz) of each effective moment of a digital signal relative to its ideal time position is called drift. Drift is described by two parameters, MTIE and TDEV (time deviation). Among them, TDEV shows the time-domain variation of the phase deviation of the given signal from the ideal signal in a statistical way through the integration time, which is defined as: [0003] TDEV ( τ ) = 1 6 n 2 ( N - 30 + 1 ...

Claims

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Application Information

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IPC IPC(8): H04L7/00
Inventor 徐一军胡昌军汪建华
Owner THE RES INST OF TELECOMM TRANSMISSION MIIT