CN110247723B - Device and method for noise identification and parameter adjustment in PTP (precision time protocol) clock network - Google Patents
Device and method for noise identification and parameter adjustment in PTP (precision time protocol) clock network Download PDFInfo
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- CN110247723B CN110247723B CN201910526098.7A CN201910526098A CN110247723B CN 110247723 B CN110247723 B CN 110247723B CN 201910526098 A CN201910526098 A CN 201910526098A CN 110247723 B CN110247723 B CN 110247723B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04J3/00—Time-division multiplex systems
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- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
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Abstract
The invention provides a device for noise identification and parameter adjustment in a PTP (precision time protocol) clock network, which comprises a message processing module, a fast Fourier transform module and a PID (proportion integration differentiation) module, wherein the message processing module is respectively and electrically connected with the PTP module, the fast Fourier transform module and the PID module; the PTP module is used for sending a PTP message containing noise information and time information to the message processing module; the message processing module is used for extracting the time deviation information of the PTP message and sending the information to the fast Fourier transform module; the fast Fourier transform module is used for determining the noise amplitude value and the noise frequency value according to the time deviation information and sending the noise amplitude value and the noise frequency value to the PID parameter adjusting module; the PID parameter adjusting module is used for determining a corresponding PID parameter correction value according to the noise amplitude value and the noise frequency value and sending the corresponding PID parameter correction value to the PID module; and the PID module is used for screening the noise information according to the time deviation information and the PID parameter correction value. The invention can identify noise in the PTP clock network and realize selective transmission according to the noise information.
Description
Technical Field
The embodiment of the invention relates to the technical field of signal processing, in particular to a device and a method for noise identification and parameter adjustment in a PTP clock network.
Background
In a PTP (precision time protocol) clock synchronization network, there are specific requirements for the transmission of network noise. Generally, a PTP network node needs to screen noise of a specific frequency to pass through the node and output the noise according to a specific amplitude.
However, in a general system, an input signal and noise are input into a PID Controller (proportional, integral, differential Controller) with fixed parameters, and then are sent to a direct digital frequency synthesizer to be frequency-synthesized with the input signal, and the PID causes different types of noise to be uniformly processed, which makes it difficult to accurately control the transmission of noise.
Disclosure of Invention
The embodiment of the invention aims to provide a device and a method for identifying noise and adjusting parameters in a PTP (precision time protocol) clock network, which can identify noise in the PTP clock network and realize selective transmission according to noise information.
To achieve the purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a device for noise identification and parameter adjustment in a PTP clock network, including a PTP module, a PID module, a message processing module, a fast fourier transform module, and a PID parameter adjustment module, where the message processing module is electrically connected to the PTP module, the fast fourier transform module, and the PID parameter adjustment module is electrically connected to the fast fourier transform module and the PID module, respectively;
the PTP module is used for sending a PTP message containing noise information and time information to the message processing module;
the message processing module is used for extracting the time deviation information of the PTP message and sending the information to the fast Fourier transform module;
the fast Fourier transform module is used for determining a noise amplitude value and a noise frequency value according to the time deviation information and sending the noise amplitude value and the noise frequency value to the PID parameter adjusting module;
the PID parameter adjusting module is used for determining a corresponding PID parameter correction value according to the noise amplitude value and the noise frequency value and sending the corresponding PID parameter correction value to the PID module;
and the PID module is used for screening the noise information according to the time deviation information and the PID parameter correction value.
Furthermore, the device also comprises a noise loader which is electrically connected with the PTP module and used for loading noise information to the PTP message.
Furthermore, the device also comprises a smoothing processing module, wherein the smoothing processing module is connected between the message processing module and the PID module and is used for filtering high-frequency interference information of the time deviation information.
In a second aspect, an embodiment of the present invention provides a method for noise identification and parameter adjustment in a PTP clock network, including:
extracting time deviation information of the PTP message containing noise information and time information;
determining the noise amplitude value and the noise frequency value according to the time deviation information;
determining a corresponding PID parameter correction value according to the noise amplitude value and the noise frequency value;
and screening the noise information according to the time deviation information and the PID parameter correction value.
Further, the determining a corresponding PID parameter correction value according to the noise amplitude value and the noise frequency value includes:
determining a noise bandwidth according to the noise amplitude value and the noise frequency value;
and determining a corresponding PID parameter correction value according to the noise bandwidth.
Further, the determining a corresponding PID parameter modification value according to the noise bandwidth includes:
determining a corresponding P parameter correction value according to the noise bandwidth;
and determining a corresponding I parameter correction value according to the noise bandwidth.
Further, the determining of the corresponding P parameter correction value according to the noise bandwidth is:
p parameter correction value (noise bandwidth/Pref bandwidth) P1A parameter value;
wherein the P reference bandwidth is a preset reference value, and P is1The parameter value corresponds to the P reference bandwidth.
Further, the determining of the corresponding I parameter modification value according to the noise bandwidth is as follows:
i parameter correction value ═ (noise bandwidth/I reference bandwidth)2*I1A parameter value;
wherein the I reference bandwidth is a preset reference value, and I is1The parameter value corresponds to the I-reference bandwidth.
Further, the screening the noise information according to the time deviation information and the PID parameter correction value includes: and screening the noise information according to the time deviation information, the P parameter correction value and the I parameter correction value.
The invention has the beneficial effects that:
the invention can identify the amplitude-frequency characteristics of different noises, accurately control the transmission of the noises according to the amplitude-frequency characteristics of the different noises, overcome the screening limitation of a fixed parameter system, realize selective transmission under the condition of noise and ensure the optimization of system time errors under the condition of no noise.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus for noise identification and parameter adjustment in a PTP clock network according to an embodiment of the present invention.
Fig. 2 is a flowchart illustrating a method for noise identification and parameter adjustment in a PTP clock network according to a second embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example one
The embodiment provides a device for noise identification and parameter adjustment in a PTP clock network, which can identify amplitude-frequency characteristics of different noises, accurately control noise transmission according to the amplitude-frequency characteristics of the different noises, overcome the screening limitation of a fixed parameter system, realize selective transmission under the condition of noise, and ensure the optimization of system time error under the condition of no noise.
Fig. 1 is a schematic structural diagram of an apparatus for noise identification and parameter adjustment in a PTP clock network according to an embodiment of the present invention. As shown in fig. 1, the device includes a PTP module, a PID module, a packet processing module, a fast fourier transform module, and a PID parameter adjusting module, wherein the packet processing module is electrically connected to the PTP module, the fast fourier transform module, and the PID parameter adjusting module is electrically connected to the fast fourier transform module and the PID module, respectively.
The PTP module is used for sending a PTP message containing noise information and time information to the message processing module.
The PTP module selects a proper speed to start sending the PTP message containing the noise information and the time information. The appropriate rate is selected based on the overhead of the system, and in this embodiment the transmission rate is no higher than 16 Hz.
The noise information includes an amplitude and a frequency corresponding to the noise.
In this embodiment, the apparatus further includes a noise loader, and the noise loader is electrically connected to the PTP module and is configured to load noise information to the PTP message. When the noise loader detects a PTP message, the periodic noise information is loaded into the PTP message, so that the PTP message sent by the PTP module contains the noise information.
The apparatus further comprises a reference source comprising an input signal for providing time information, i.e. providing a time reference, to the PTP module.
And the message processing module is used for extracting the time deviation information of the PTP message and sending the information to the fast Fourier transform module.
Wherein, the time deviation information includes noise information.
And the fast Fourier transform module is used for determining a noise amplitude value and a noise frequency value according to the time deviation information and sending the noise amplitude value and the noise frequency value to the PID parameter adjusting module.
And the fast Fourier transform module analyzes the information after receiving the information, extracts the noise amplitude and the noise frequency value in the time deviation information and sends the noise amplitude and the noise frequency value to the PID parameter adjusting module.
And the PID parameter adjusting module is used for determining a corresponding PID parameter correction value according to the noise amplitude value and the noise frequency value and sending the corresponding PID parameter correction value to the PID module.
And determining the bandwidth according to the noise amplitude and the noise frequency, and then determining the corresponding PID parameter correction value according to the bandwidth, namely the corresponding new P value and I value.
And the PID module is used for screening the noise information according to the time deviation information and the PID parameter correction value.
The PID module receives the time deviation information and the PID parameter correction value at the same time, namely receives 3 parameters, the time deviation information, a new P value and a new I value to screen the noise information. Because the PID parameter correction value is obtained by calculation according to the noise characteristic, the PID module has the frequency selection characteristic and the dynamic adjustment characteristic, the noise information is screened, the noise can be selectively passed, and the output amplitude value and the noise frequency value of the noise can be better controlled.
In this embodiment, the apparatus further includes a smoothing module, connected between the packet processing module and the PID module, for filtering high-frequency interference information of the time deviation information.
The message processing module is electrically connected with the PID module through the smooth processing module. And filtering high-frequency interference signals from the information received from the message processing module, attenuating noise, and still keeping the integrity of the time deviation information.
In this embodiment, the apparatus further includes a direct digital frequency synthesizer electrically connected to the PID module, for receiving the filtered noise information, the input signal and the noise outputted by the PID module, where the filtered noise information includes the frequency adjustment amount.
Meanwhile, the reference source provides input signals containing time information, after the input signals pass through the PTP module, the PTP message contains the time information, the PTP message is processed through the message processing module and the PID module, input signals are screened, and then the input signals are transmitted to the direct digital frequency synthesizer. The direct digital frequency synthesizer changes the frequency control code of the phase accumulator according to the frequency adjustment quantity meeting the noise transmission requirement in the screened noise information, and then determines the phase increment according to the frequency control code of the phase accumulator to synthesize a corresponding waveform under the condition of a certain sampling period, so that time synchronization is realized, and the output frequency signal carries the noise meeting the transmission requirement.
The output end of the PTP module is connected with the fast Fourier transform module, the amplitude-frequency characteristic of noise can be extracted, the PID parameter adjusting module is connected, and the parameters can be dynamically adjusted according to the extracted amplitude-frequency characteristic, so that the noise transmission is accurately controlled, the screening limitation of a fixed parameter system is overcome, the selective transmission under the noisy condition is realized, and the optimization of the system time error is ensured under the noiseless condition.
Example two
The embodiment provides a method for noise identification and parameter adjustment in a PTP clock network, which is executed by the device for noise identification and parameter adjustment in the PTP clock network, solves the same technical problem and achieves the same technical effect. Fig. 2 is a flowchart illustrating a method for noise identification and parameter adjustment in a PTP clock network according to a second embodiment of the present invention. As shown in fig. 2, the method includes the following specific steps:
and S11, extracting the time deviation information of the PTP message containing the noise information and the time information.
The time deviation information includes noise information, and the noise information includes amplitude-frequency characteristics corresponding to the noise.
And S12, determining the noise amplitude value and the noise frequency value according to the time deviation information.
And determining the noise amplitude value and the noise frequency value according to the amplitude-frequency characteristic corresponding to the noise.
And S13, determining the corresponding PID parameter correction value according to the noise amplitude value and the noise frequency value.
Specifically, determining a noise bandwidth according to the noise amplitude value and the noise frequency value; and determining a corresponding PID parameter correction value according to the noise bandwidth.
Further, the determining a corresponding PID parameter modification value according to the noise bandwidth includes:
and determining a corresponding P parameter correction value according to the noise bandwidth.
The calculation is made according to the following formula:
p parameter correction value (noise bandwidth/Pref bandwidth) P1The parameter values.
Wherein the P reference bandwidth is presetSubstituting the P reference bandwidth into the apparatus of the foregoing embodiment and obtaining P through MATLAB simulation1Value of a parameter, said P1The parameter value corresponds to the P reference bandwidth.
The P reference bandwidth is selected according to the actual situation, and the corresponding P is selected according to the P reference bandwidth1The parameter values.
And determining a corresponding I parameter correction value according to the noise bandwidth.
The calculation is made according to the following formula:
i parameter correction value ═ (noise bandwidth/I reference bandwidth)2*I1The parameter values.
The I reference bandwidth is a preset reference value, and is substituted into the apparatus of the foregoing embodiment to obtain I through MATLAB simulation1Value of a parameter, said I1The parameter value corresponds to the I-reference bandwidth.
Selecting I reference bandwidth according to actual condition, and selecting corresponding I according to I reference bandwidth1The parameter values.
And S14, screening the noise information according to the time deviation information and the PID parameter correction value.
Specifically, the noise information is screened according to the time deviation information, the P parameter correction value and the I parameter correction value. The PID parameter correction value is obtained by calculation according to the noise characteristics contained in the time deviation information, so that the PID parameter correction value has the frequency selection characteristic and the dynamic adjustment characteristic corresponding to the noise information, and the noise information can be screened through formula calculation.
The PID arithmetic formula is:
wherein u (t) is the controlled variable (controller output), e (t) is the deviation of the controlled variable from the given value, KpTo proportional gain, TITo integrate the time constant, TDIs the differential time constant.
Substituting the received time deviation information into e (t), substituting the P parameter correction value into KpAnd substituting the I parameter correction value into TIAnd obtaining u (t), namely new noise information, so that the noise information can be screened.
In this embodiment, the method further includes performing frequency adjustment by the direct digital frequency synthesizer according to the input signal, the noise and the noise information filtered in step S14.
Wherein, the screened noise information comprises a frequency adjustment amount.
Specifically, the direct digital frequency synthesizer receives the input signal and noise processed by the PTP module, the message processing module, and the PID module, and receives the frequency adjustment quantity meeting the noise transmission requirement, changes the frequency control code of the phase accumulator according to the frequency adjustment quantity meeting the noise transmission requirement in the filtered noise information, and determines the phase increment according to the frequency control code of the phase accumulator to synthesize the corresponding waveform under the condition of a certain sampling period, thereby realizing time synchronization, enabling the output frequency signal to carry the noise meeting the transmission requirement, and realizing frequency adjustment.
In this embodiment, the amplitude-frequency characteristics corresponding to noise are extracted from the PTP message including the noise information and the time information, and the parameters can be dynamically adjusted according to the extracted amplitude-frequency characteristics, so that the transmission of the noise is accurately controlled, the screening limitation of a fixed parameter system is overcome, the selective transmission is realized under the condition of noise, and the optimization of the system time error is ensured under the condition of no noise.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (8)
1. A noise identification and parameter adjustment device in a PTP clock network comprises a PTP module and a PID module, and is characterized by further comprising: the device comprises a message processing module, a fast Fourier transform module, a PID parameter adjusting module and a smooth processing module, wherein the message processing module is respectively and electrically connected with the PTP module, the fast Fourier transform module and the PID module, and the PID parameter adjusting module is respectively and electrically connected with the fast Fourier transform module and the PID module;
the PTP module is used for sending a PTP message containing noise information and time information to the message processing module;
the message processing module is used for extracting the time deviation information of the PTP message and sending the information to the fast Fourier transform module;
the fast Fourier transform module is used for determining a noise amplitude value and a noise frequency value according to the time deviation information and sending the noise amplitude value and the noise frequency value to the PID parameter adjusting module;
the smoothing processing module is connected between the message processing module and the PID module and is used for filtering high-frequency interference information of the time deviation information;
the PID parameter adjusting module is used for determining a corresponding PID parameter correction value according to the noise amplitude value and the noise frequency value and sending the corresponding PID parameter correction value to the PID module;
and the PID module is used for screening the noise information according to the time deviation information and the PID parameter correction value.
2. The apparatus for noise identification and parameter adjustment in a PTP clock network of claim 1 further comprising a noise loader electrically connected to the PTP module for loading noise information to the PTP messages.
3. A method of noise identification and parameter adjustment in a PTP clock network, performed by the apparatus for noise identification and parameter adjustment in a PTP clock network of claim 1 or 2, comprising:
extracting time deviation information of the PTP message containing noise information and time information;
determining the noise amplitude value and the noise frequency value according to the time deviation information;
determining a corresponding PID parameter correction value according to the noise amplitude value and the noise frequency value;
and screening the noise information according to the time deviation information and the PID parameter correction value.
4. The method of noise identification and parameter adjustment in a PTP clock network of claim 3, wherein said determining a corresponding PID parameter correction value based on the noise magnitude value and the noise frequency value comprises:
determining a noise bandwidth according to the noise amplitude value and the noise frequency value;
and determining a corresponding PID parameter correction value according to the noise bandwidth.
5. The method of noise identification and parameter adjustment in a PTP clock network of claim 4, wherein the determining the corresponding PID parameter correction value according to the noise bandwidth includes:
determining a corresponding P parameter correction value according to the noise bandwidth;
and determining a corresponding I parameter correction value according to the noise bandwidth.
6. The method of noise identification and parameter adjustment in a PTP clock network of claim 5, wherein the determining the corresponding P parameter modification value according to the noise bandwidth is:
p parameter correction value (noise bandwidth/Pref bandwidth) P1A parameter value;
wherein the P reference bandwidth is a preset reference value, and P is1The parameter value corresponds to the P reference bandwidth.
7. The method of noise identification and parameter adjustment in a PTP clock network of claim 5, wherein the determining the corresponding I parameter modification value according to the noise bandwidth is:
i parameter correction value ═ (noise bandwidth/I reference bandwidth)2*I1A parameter value;
wherein the I reference bandwidth is a preset reference value, and I is1The parameter value corresponds to the I-reference bandwidth.
8. The method of noise identification and parameter adjustment in a PTP clock network of claim 5, wherein the screening the noise information according to the time deviation information and the PID parameter modification value comprises: and screening the noise information according to the time deviation information, the P parameter correction value and the I parameter correction value.
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| CN101867469A (en) * | 2010-06-10 | 2010-10-20 | 北京东土科技股份有限公司 | Realization method of precision synchronous clock |
| CN105007134A (en) * | 2015-07-29 | 2015-10-28 | 国家电网公司 | Method and device for restraining packet network PDV (Packet Delay Variation) noise and slave clock equipment |
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| CN102420793A (en) * | 2011-11-24 | 2012-04-18 | 天津大学 | Tracking control method for time and carrier frequency synchronization of digital communication receiver |
| US9385599B2 (en) * | 2013-04-25 | 2016-07-05 | Infineon Technologies Austria Ag | Converter circuit and method for converting an input voltage to an output voltage using a white noise generator |
| JP2014238357A (en) * | 2013-06-10 | 2014-12-18 | ソニー株式会社 | Reception device, time difference calculation method and program |
| CN204465552U (en) * | 2015-01-27 | 2015-07-08 | 上海电控研究所 | Bimodulus time service master clock device |
| CN105680970B (en) * | 2016-01-15 | 2018-03-06 | 上海交通大学 | Radio astronomy array remote fiber synchronization system and its method |
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| CN101867469A (en) * | 2010-06-10 | 2010-10-20 | 北京东土科技股份有限公司 | Realization method of precision synchronous clock |
| CN105007134A (en) * | 2015-07-29 | 2015-10-28 | 国家电网公司 | Method and device for restraining packet network PDV (Packet Delay Variation) noise and slave clock equipment |
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