CN117478292B - Time synchronization method and equipment for frequency synchronization network auxiliary time synchronization network - Google Patents
Time synchronization method and equipment for frequency synchronization network auxiliary time synchronization network Download PDFInfo
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Abstract
The invention relates to a time synchronization method and equipment of a frequency synchronization network auxiliary time synchronization network; the method comprises the following steps: acquiring frequency synchronization signals and time synchronization signals of a frequency synchronization network node and a time synchronization network node, wherein the time synchronization signals comprise time synchronization signal measurement values of a current counting period and a plurality of adjacent historical counting periods; the frequency synchronization signal is a frequency synchronization signal count value corresponding to each counting period; performing time-frequency consistency detection based on the frequency synchronous signal and the time synchronous signal; if the time-frequency consistency detection is not passed, correcting the time synchronization signal of the current counting period based on the frequency synchronization signals corresponding to the current counting period and the historical counting periods, and completing the time synchronization of the time synchronization network. The invention solves the problems of high cost and poor reliability of the time synchronization system in the prior art.
Description
Technical Field
The invention belongs to the technical field of time synchronization of a multipath communication system, and particularly relates to a time synchronization method and equipment for a frequency synchronization network auxiliary time synchronization network.
Background
In a multi-channel communication system such as a mobile communication network or a power network, the high-precision time and frequency synchronization of a station is used as an important basic support of the system, and has important significance for the correct and stable operation of the communication and power system. In the construction of synchronous networks, time and frequency synchronous networks are currently being constructed to provide highly reliable foundation time and frequency signals to communication base stations or power application sites.
The current time synchronization network and frequency synchronization network are used as two independent networks, and transmit time synchronization signals and high-stability frequency signals through a transmission link, and each station utilizes the high-precision time synchronization signals and the frequency signals to complete respective related services. The time synchronization signal is constructed by adopting a bidirectional link principle and is constructed with a bearing network in a common mode, the signal precision performance of the time synchronization signal can be affected by inconsistent round-trip links (especially under unidirectional optical fiber links), and the jitter of the time synchronization signal caused by network switching operation can reach millisecond level along with the expansion of the network scale; the frequency synchronization signal is basically unaffected in signal frequency stability due to the characteristics of the physical transmission mechanism.
However, due to the correlation between time and frequency, if the terminal can combine the time signal and the frequency signal, and the performance of the time synchronization signal of the time synchronization network is monitored and corrected based on the high-frequency signal of the frequency synchronization network, the performance of the time synchronization signal can be further improved without adding additional hardware facilities, and the influence of the time synchronization performance degradation (such as network switching operation, etc.) on the system synchronization performance can be weakened to a certain extent.
Disclosure of Invention
In view of the above analysis, the invention aims to disclose a time synchronization method and equipment for a frequency synchronization network auxiliary time synchronization network, which solve the problems of high cost and poor reliability of a time synchronization system in the prior art.
The aim of the invention is mainly realized by the following technical scheme:
in one aspect, the invention discloses a time synchronization method of a frequency synchronization network auxiliary time synchronization network, which comprises the following steps:
acquiring frequency synchronization signals and time synchronization signals of a frequency synchronization network node and a time synchronization network node, wherein the time synchronization signals comprise time synchronization signal measurement values of a current counting period and a plurality of adjacent historical counting periods; the frequency synchronization signal is a frequency synchronization signal count value corresponding to each counting period;
performing time-frequency consistency detection based on frequency synchronization signal count values corresponding to the current and multiple historical count periods;
if the time-frequency consistency detection is not passed, correcting the time synchronization signal of the current counting period based on the current counting period and the frequency synchronization signals corresponding to a plurality of historical counting periods, and completing the time synchronization of the time synchronization network.
Further, the detecting the time-frequency consistency based on the frequency synchronization signal count values corresponding to the current and the plurality of historical count periods includes:
acquiring frequency synchronization signal count values corresponding to N current and adjacent historical count periods;
based on the obtained frequency synchronization signal count values corresponding to the adjacent N historical count periods, obtaining the time-frequency consistency statistical parameters of the adjacent N historical count periods；
Based on the frequency synchronous signal count values of the current counting period and the previous adjacent counting period, obtaining the time-frequency consistency parameter of the current counting period；
Based onAnd->Difference of->And a second stability index of the frequency synchronization network node +.>And judging to obtain a time-frequency consistency detection result.
Further, the difference isExpressed as: />；
If it isThen determine the time synchronization signal measurement value of the current counting period +.>Failing to pass the time-frequency consistency detection;
if it isThen determine the time synchronization signal measurement value of the current counting period +.>And detecting through time-frequency consistency.
Further, the time-frequency consistency statistical parameters of the adjacent N historical counting periods are obtained through the following formula：
；
Wherein,indicate->Counting cycle->Representing the current count cycle,/>Andis->And->Frequency synchronization signal count value corresponding to each count period, < ->For a preset time interval per counting period.
Further, the time-frequency consistency parameter of the current counting period is obtained by the following formula：
；
Wherein,and->For the frequency synchronous signal count value corresponding to the current counting period and the previous counting period, +.>For a preset time interval per counting period.
Further, the correcting the time synchronization signal of the current counting period which does not pass the time-frequency consistency detection includes:
based on the frequency synchronous signal count value corresponding to the current count period and the time-frequency consistency statistical parameters of N adjacent historical count periodsObtaining a frequency correction amount corresponding to the current counting period;
based on the frequency correction quantity, obtaining a corrected frequency count value corresponding to the current timing period;
and correcting the time synchronization signal based on the corrected frequency count value to obtain a corrected time synchronization signal.
Further, the frequency correction amount is obtained by the following formula:
；
wherein,for the frequency correction corresponding to the current counting period, +.>Andfor the frequency synchronous signal count value corresponding to the current counting period and the previous counting period, +.>For a preset time interval per counting period.
Further, the corrected frequency count value corresponding to the current timing period is obtained by the following formula:
；
the corrected time synchronization signal is obtained by the following formula:
wherein,for correcting the frequency count value->For the frequency correction corresponding to the current counting period, +.>Count value of frequency synchronous signal corresponding to current counting period, < >>For the period of the frequency signal of the frequency synchronous network, < >>Is the corrected time synchronization signal.
On the other hand, a time synchronization device of a frequency synchronization network auxiliary time synchronization network is also disclosed, the device comprises a frequency synchronization network node, a time synchronization network node and a fusion node, wherein:
the frequency synchronization network node and the time synchronization network node are respectively used for sending a frequency synchronization signal and a time synchronization signal to the fusion node, and the time synchronization signal comprises a current counting period and time synchronization signal measurement values of a plurality of adjacent historical counting periods; the frequency synchronization signal is a frequency synchronization signal count value corresponding to each counting period;
the fusion node is used for carrying out time-frequency consistency detection based on frequency synchronization signal count values corresponding to the current and multiple historical count periods; and correcting the time synchronization signal of the current counting period which does not pass the time-frequency consistency detection based on the frequency synchronization signals corresponding to the current and a plurality of historical counting periods.
Further, the detecting the time-frequency consistency based on the frequency synchronization signal and the time synchronization signal includes:
acquiring frequency synchronization signal count values corresponding to N current and adjacent historical count periods;
based on the obtained frequency synchronization signal count values corresponding to the adjacent N historical count periods, obtaining the time-frequency consistency statistical parameters of the adjacent N historical count periods；
Based on the same frequency of the current counting period and the previous adjacent counting periodStep signal count value, obtain the time-frequency consistency parameter of the current count period；
Acquiring a second stability index of the frequency synchronous network nodeAnd calculate +.>And->Difference of->；
If it isThen determine the time synchronization signal measurement value of the current counting period +.>Failing to pass the time-frequency consistency detection;
if it isThen determine the time synchronization signal measurement value of the current counting period +.>And detecting through time-frequency consistency.
The invention can at least realize the following beneficial effects:
according to the node high-reliability time synchronization method for the frequency synchronization network auxiliary time synchronization network, the existing time synchronization network and the frequency synchronization network are fused, the frequency network high-stability frequency signal is used for assisting the time network synchronization signal, detection and correction of time synchronization signal jump are completed, influence of the time synchronization signal jump on the time synchronization signal can be weakened, and therefore time synchronization accuracy, stability and reliability of the time synchronization network are improved.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to designate like parts throughout the drawings;
fig. 1 is a flowchart of a time synchronization method of a frequency synchronization network auxiliary time synchronization network in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a method for performing synchronization time correction by a software method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a method for performing synchronization time correction by hardware in an embodiment of the present invention;
FIG. 4 is a block diagram of a method for adjusting the time of precision hardware based on an FPGA combined with a high-precision phase detector in an embodiment of the invention;
FIG. 5 is a schematic diagram of a method for performing synchronous time correction by combining soft and hard in an embodiment of the invention;
fig. 6 is a block diagram of a time synchronization apparatus of a frequency synchronization network auxiliary time synchronization network according to an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention are described in detail below with reference to the attached drawing figures, which form a part of the present application and, together with the embodiments of the present invention, serve to explain the principles of the invention.
The embodiment of the invention discloses a time synchronization method of a frequency synchronization network auxiliary time synchronization network, which is shown in figure 1 and comprises the following steps:
step S1: acquiring frequency synchronization signals and time synchronization signals of a frequency synchronization network node and a time synchronization network node, wherein the time synchronization signals comprise time synchronization signal measurement values of a current counting period and a plurality of adjacent historical counting periods; the frequency synchronization signal is a frequency synchronization signal count value corresponding to each counting period;
in particular, in a multi-node synchronous network system such as a mobile communication network and an electric power network, a time synchronous network and a frequency synchronous network are usually used as two independent networks, and a time synchronous signal and high stability are transmitted through a transmission linkEach site node utilizes the high-precision time synchronization signal and the frequency signal to complete each relevant service; the frequency synchronous network consists of clock node equipment and synchronous clock links; the time synchronization network adopts an optical fiber network to realize high-precision transmission of PPS second dashes of a master station through an IEEE 1588 protocol; the time synchronization signal is easily affected by network cutting operation and the like to cause jitter of the time synchronization signal; and the frequency synchronization signal is basically unaffected in signal frequency stability due to the characteristics of the physical transmission mechanism. According to the embodiment, the time synchronization signal of the time synchronization network is detected and corrected in an auxiliary mode through the frequency synchronization signal of the frequency synchronization network, so that the synchronization accuracy, the robustness and the reliability of the time synchronization network are improved. In practical application, firstly, the time synchronization signal measurement values of the current counting period and a plurality of historical counting periods of the time synchronization network are obtainedAnd a frequency synchronization signal count value +/in each time count period>Preferably, a->Get->For subsequent fusion processing; in particular, the frequency synchronization signal count value may be in the form of an integer or a fraction, and in particular, the fraction may be higher in accuracy than the integer form under the same conditions as the count mode of the portion.
Step S2: performing time-frequency consistency detection based on frequency synchronization signal count values corresponding to the current and multiple historical count periods;
specifically, the current time is recorded as k, and the measured value of the historical time synchronization signal is recorded as、/>、……/>The method comprises the steps of carrying out a first treatment on the surface of the The test value of the historical frequency synchronous signal is +.>、/>、……/>The time synchronization signal measured value and the frequency synchronization signal count value at the present moment are +.>And->The measuring interval is +.>The method comprises the steps of carrying out a first treatment on the surface of the Firstly, obtaining time-frequency consistency statistical parameters +.f of adjacent N historical counting periods based on the obtained frequency synchronous signal count values corresponding to the adjacent N historical counting periods>The method comprises the steps of carrying out a first treatment on the surface of the And based on the frequency synchronous signal count values of the current counting period and the previous adjacent counting period, obtaining the time-frequency consistency parameter of the current counting period>The method comprises the steps of carrying out a first treatment on the surface of the Then, based on->And->Difference of->And second stability index of frequency synchronous network node +.>Judging to obtain a time-frequency consistency detection result, namely judging whether the time synchronization signal jumps or not by utilizing a high stability index of the frequency synchronization signal and combining the frequency index obtained by calculation of a time synchronization network;
wherein the difference isExpressed as: />；
If it isThen determine the time synchronization signal measurement value of the current counting period +.>Failing to pass the time-frequency consistency detection;
if it isThen determine the time synchronization signal measurement value of the current counting period +.>And detecting through time-frequency consistency.
More specifically, the time-frequency consistency statistical parameters of N adjacent historical counting periods are obtained through the following formulaN is->：
；
Wherein,indicate->Counting cycle->Representing the current count cycle,/>Andis->And->Frequency synchronization signal count value corresponding to each count period, < ->For a preset time interval per counting period.
Obtaining the time-frequency consistency parameter of the current counting period through the following formula：
；
Wherein,and->For the frequency synchronous signal count value corresponding to the current counting period and the previous counting period, +.>For a preset time interval per counting period.
In this embodiment, consistency check is performed on the current time-frequency signal based on the current count value and the historical count value of the time-frequency synchronization network and the frequency synchronization network, that is, whether the time-frequency signal has a jump is checked based on the stable frequency signal, so that whether the current time-frequency signal is good is judged under the assistance of the frequency signal. If no jump exists, the current time synchronizing signal is considered to be good, and the current time synchronizing signal is directly output as an updated time synchronizing signal; if a jump exists, the time synchronization signal of the current count period is modified.
Step S3: if the time-frequency consistency detection is not passed, correcting the time synchronization signal of the current counting period based on the current counting period and the frequency synchronization signals corresponding to a plurality of historical counting periods, and completing the time synchronization of the time synchronization network.
Specifically, the statistics parameters of time-frequency consistency are firstly based on the frequency synchronous signal count value corresponding to the current count period and N adjacent historical count periodsObtaining a frequency correction amount corresponding to the current counting period; that is, based on the frequency value of the previous measurement period and the frequency amounts of the previous N measurement values, the frequency correction amount of the present measurement period is predicted;
then, based on the frequency correction quantity, obtaining a corrected frequency count value corresponding to the current timing period; and correcting the time synchronization signal based on the corrected frequency count value to obtain a corrected time synchronization signal.
More specifically, the frequency correction amount is obtained by the following formula:
；
wherein,for the frequency correction corresponding to the current counting period, +.>Andfor the frequency synchronous signal count value corresponding to the current counting period and the previous counting period, +.>For a preset time interval per counting period.
Obtaining a corrected frequency count value corresponding to the current timing period through the following formula:
；
the corrected time synchronization signal is obtained by the following formula:
；
wherein,for correcting the frequency count value->For the frequency correction corresponding to the current counting period, +.>Count value of frequency synchronous signal corresponding to current counting period, < >>For the period of the frequency signal of the frequency synchronous network, < >>Is the corrected time synchronization signal.
The time synchronization method of the embodiment is established on the basis that the frequency synchronization network can stabilize the frequency, and the detection accuracy of the system on the synchronization signal is improved along with the accumulation of the history information because the time-frequency consistency test uses the history information.
In practical application, according to the actual software and hardware configuration conditions of the synchronous network system, after the corrected frequency count value is obtained, time correction can be realized in a mode of software, hardware or combination of software and hardware; when the time synchronization network outputs a time signal, the correction frequency count value is additionally increased to output on the basis of the PPS and the time mark output by the original time synchronization network;
specifically, as shown in fig. 2, performing time correction by a software method includes: converting the corrected frequency count value into a physical time count value in s, i.eAnd converting the input time mark information into a corrected physical time count value to output, and finishing time mark software correction of the time synchronization network second pulse information.
As shown in fig. 3, the hardware modification includes: the method is characterized in that a high-stability atomic clock of a frequency synchronous network is used as a reference, an FPGA is combined with a high-precision phase discriminator, or a clock phase-shifting TDC (Time-to-Digital Converter) technology based on the FPGA is adopted, accurate hardware correction is carried out on PPS signals in a Time synchronous network based on correction frequency count values, the performance requirements on the FPGA are high, and correction of the PPS signals of the node second pulse is completed.
The hardware adjustment mode of the FPGA combined with the high-precision phase discriminator is shown in fig. 4, and processing units such as a numerical control oscillator, a frequency divider, a phase-locked loop, the high-precision phase discriminator, a low-pass filter, a corrector, frequency generation word calculation and the like are realized through the FPGA and are used for correcting time synchronization signals; specifically, a frequency signal is generated by a numerical control oscillator based on a local high-stability reference frequency introduced by an FPGA (field programmable gate array) or a frequency network, and the frequency signal is respectively input into a frequency divider and a phase-locked loop; generating a high-frequency source through a phase-locked loop to serve as a high-stability working clock of the high-precision phase discriminator; generating a second pulse signal through a frequency divider, finishing phase discrimination with the input 1PPS through a high-precision phase discriminator, and inputting a phase discrimination result into a corrector after finishing noise suppression through a low-pass filter; the corrector takes a high-frequency source generated by a high-stability clock phase-locked loop as an adjustment reference, and completes precise adjustment of 1PPS based on a phase discrimination result after noise suppression on the basis of 1PPS generated by a frequency divider; the embodiment also calculates and updates the frequency generation word of the numerical control oscillator based on the output result of the high-precision phase discriminator by combining the corrected frequency count value so as to correct and update the time synchronization signal and improve the precision of time synchronization.
The Time interval counter developed based on the TDC method is adopted in the clock phase shift TDC (Time-to-Digital Converter) technology based on the FPGA, the counter is realized on one FPGA, the latest delay line design and the ultra-strong function FPGA are adopted, 128 delay units are adopted, the measurement resolution of the counter reaches 100ps, the measurement result under the worst condition is 170ps, the measurement resolution after compensating nonlinear errors reaches 70ps, and the maximum power consumption of a counter chip is 260mw. As shown in fig. 5, the correction by combining software and hardware is a time correction method of a time synchronization network, which is adopted for the defect of time processing resolution of a node 'PPS second pulse hardware' unit, and is different from the hardware correction, the time residual of the hardware correction is taken as correction time residual information, and the original input time mark information is corrected by a software mode. The correction method combining hardware and software has lower requirement on time processing resolution of the PPS pulse hardware unit, and can be implemented by adopting an FPGA and taking a reference clock or reference clock frequency multiplication of the FPGA as timing reference.
Under the combination of software and hardware, the time adjustment of the FPGA is carried out by sampling the input PPS, the FPGA generates a time adjustment basic interval unit based on a reference clock or frequency multiplication of the reference clock to finish the adjustment of the PPS, and residual information of the PPS is mainly obtained, on the one hand, the acquisition error of the FPGA to the input PPS (the error is smaller than one clock period of the FPGA) and on the other hand, the basic interval time of the FPGA clock adjustment unit (the error is one basic interval time) are adopted; therefore, the residual information generated by hardware correction is further corrected by combining a software correction mode, and the correction precision of the time synchronization signal is improved.
The time synchronization method of the frequency synchronization network auxiliary time synchronization network of the invention utilizes the high-stability frequency signal of the frequency synchronization network to assist the time synchronization signal of the time synchronization network by fusing the existing time synchronization network and the frequency synchronization network, completes the jump detection of the time synchronization signal and corrects the time synchronization signal with jump, can weaken the influence of the time synchronization signal jump on the time synchronization signal, thereby improving the time synchronization precision, stability and reliability of the time synchronization network and realizing the high-reliability time synchronization of the time synchronization node
In another embodiment of the present invention, there is further provided a time synchronization device of a frequency synchronization network auxiliary time synchronization network, as shown in fig. 6, the device includes a frequency synchronization network node, a time synchronization network node, and a fusion node, where:
the frequency synchronization network node and the time synchronization network node are respectively used for sending a frequency synchronization signal and a time synchronization signal to the fusion node, and the time synchronization signal comprises a current counting period and time synchronization signal measurement values of a plurality of adjacent historical counting periods; the frequency synchronization signal is a frequency synchronization signal count value corresponding to each counting period;
the fusion node is used for carrying out time-frequency consistency detection based on frequency synchronization signal count values corresponding to the current and multiple historical count periods; and correcting the time synchronization signal of the current counting period which does not pass the time-frequency consistency detection based on the frequency synchronization signals corresponding to the current and a plurality of historical counting periods.
Wherein, carry out time frequency consistency detection based on the frequency synchronization signal and the time synchronization signal, include:
acquiring frequency synchronization signal count values corresponding to N current and adjacent historical count periods;
based on the obtained frequency synchronization signal count values corresponding to the adjacent N historical count periods, obtaining the time-frequency consistency statistical parameters of the adjacent N historical count periods；
Based on the frequency synchronous signal count values of the current counting period and the previous adjacent counting period, obtaining the time-frequency consistency parameter of the current counting period；
Acquiring a second stability index of the frequency synchronous network nodeAnd calculate +.>And->Difference of->；
If it isThen determine the time synchronization signal measurement value of the current counting period +.>Failing to pass the time-frequency consistency detection;
if it isThen determine the time synchronization signal measurement value of the current counting period +.>And detecting through time-frequency consistency.
In summary, the time synchronization device of the frequency synchronization network auxiliary time synchronization network of the invention fuses the corresponding time synchronization signal and the frequency synchronization signal through the fusion node of each site, and utilizes the high-frequency stabilization signal of the frequency synchronization network to assist the time synchronization signal of the time synchronization network to correct the time synchronization signal with jump.
Those skilled in the art will appreciate that implementing all or part of the processes of the methods in the above embodiments may be accomplished by computer programs to instruct related hardware, and that the programs may be stored in a computer readable storage medium. Wherein the computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory, etc.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (6)
1. A time synchronization method for a frequency synchronization network assisted time synchronization network, comprising:
acquiring frequency synchronization signals and time synchronization signals of a frequency synchronization network node and a time synchronization network node, wherein the time synchronization signals comprise time synchronization signal measurement values of a current counting period and a plurality of adjacent historical counting periods; the frequency synchronization signal is a frequency synchronization signal count value corresponding to each counting period;
performing time-frequency consistency detection based on frequency synchronization signal count values corresponding to the current and a plurality of historical count periods, including: acquiring frequency synchronization signal count values corresponding to N current and adjacent historical count periods;
based on the obtained frequency synchronization signal count values corresponding to the adjacent N historical count periods, obtaining the time-frequency consistency statistical parameters of the adjacent N historical count periods through the following formula：
；
Wherein,indicate->Counting cycle->Representing the current count cycle,/>And->Is->And->Frequency synchronization signal count value corresponding to each count period, < ->A preset time interval of each counting period;
based on the frequency synchronous signal count values of the current counting period and the previous adjacent counting period, obtaining the time-frequency consistency parameter of the current counting period；
Based onAnd->Difference of->And a second stability index of the frequency synchronization network node +.>Judging to obtain a time-frequency consistency detection result;
if the time-frequency consistency detection is not passed, correcting the time synchronization signal of the current counting period based on the current counting period and the frequency synchronization signals corresponding to a plurality of historical counting periods, and completing the time synchronization of the time synchronization network; wherein, the correcting the time synchronization signal of the current counting period which does not pass the time-frequency consistency detection comprises the following steps: based on the frequency synchronous signal count value corresponding to the current count period and the time-frequency consistency statistical parameters of N adjacent historical count periodsObtaining a frequency correction amount corresponding to the current counting period; based on the frequency correction quantity, obtaining a corrected frequency count value corresponding to the current timing period; and correcting the time synchronization signal based on the corrected frequency count value to obtain a corrected time synchronization signal.
2. The method for time synchronization of a frequency synchronization network assisted time synchronization network according to claim 1, wherein the difference valueExpressed as: />；
If it isThen determine the time synchronization signal measurement value of the current counting period +.>Failing to pass the time-frequency consistency detection;
if it isThen determine the time synchronization signal measurement value of the current counting period +.>And detecting through time-frequency consistency.
3. The method for time synchronization of a frequency synchronization network assisted time synchronization network according to claim 1, wherein the time-frequency consistency parameter of the current counting period is obtained by the following formula：
；
Wherein,and->For the frequency synchronous signal count value corresponding to the current counting period and the previous counting period, +.>For a preset time interval per counting period.
4. The method for time synchronization of a frequency synchronization network assisted time synchronization network according to claim 1, wherein the frequency correction is obtained by the following formula:
；
wherein,for the frequency correction corresponding to the current counting period, +.>Andfor the frequency synchronous signal count value corresponding to the current counting period and the previous counting period, +.>For a preset time interval per counting period.
5. The time synchronization method of a frequency synchronization network auxiliary time synchronization network according to claim 1, wherein the corrected frequency count value corresponding to the current timing period is obtained by the following formula:
；
the corrected time synchronization signal is obtained by the following formula:
，
wherein,for correcting the frequency count value->For the frequency correction corresponding to the current counting period, +.>As the wayFrequency synchronization signal count value corresponding to the previous count period, < >>For the period of the frequency signal of the frequency synchronous network, < >>Is the corrected time synchronization signal.
6. A time synchronization device of a frequency synchronization network auxiliary time synchronization network, the device comprising a frequency synchronization network node, a time synchronization network node and a fusion node, wherein:
the frequency synchronization network node and the time synchronization network node are respectively used for sending a frequency synchronization signal and a time synchronization signal to the fusion node, and the time synchronization signal comprises a current counting period and time synchronization signal measurement values of a plurality of adjacent historical counting periods; the frequency synchronization signal is a frequency synchronization signal count value corresponding to each counting period;
the fusion node is used for carrying out time-frequency consistency detection based on frequency synchronization signal count values corresponding to the current and multiple historical count periods; correcting the time synchronization signal of the current counting period which does not pass the time-frequency consistency detection based on the frequency synchronization signals corresponding to the current and a plurality of historical counting periods; wherein, the detecting the time-frequency consistency based on the frequency synchronization signal and the time synchronization signal includes: acquiring frequency synchronization signal count values corresponding to N current and adjacent historical count periods; based on the obtained frequency synchronization signal count values corresponding to the adjacent N historical count periods, obtaining the time-frequency consistency statistical parameters of the adjacent N historical count periods through the following formula：
；
Wherein,indicate->Counting cycle->Representing the current count cycle,/>And->Is->And->Frequency synchronization signal count value corresponding to each count period, < ->A preset time interval of each counting period;
based on the frequency synchronous signal count values of the current counting period and the previous adjacent counting period, obtaining the time-frequency consistency parameter of the current counting period；
Acquiring a second stability index of the frequency synchronous network nodeAnd calculate +.>And->Difference of->；
If it isThen determine the time synchronization signal measurement value of the current counting period +.>Failing to pass the time-frequency consistency detection;
if it isThen determine the time synchronization signal measurement value of the current counting period +.>And detecting through time-frequency consistency.
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| CN102237941A (en) * | 2010-04-28 | 2011-11-09 | 中兴通讯股份有限公司 | Time synchronization system and method |
| KR20130005124A (en) * | 2011-07-05 | 2013-01-15 | 한국항공대학교산학협력단 | Time synchronization apparatus and method for mimo-ofdm based system |
| CN114050884A (en) * | 2021-11-08 | 2022-02-15 | 重庆邮电大学 | Cross-network time synchronization method oriented to industrial wireless and TSN fusion |
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| CN102237941A (en) * | 2010-04-28 | 2011-11-09 | 中兴通讯股份有限公司 | Time synchronization system and method |
| KR20130005124A (en) * | 2011-07-05 | 2013-01-15 | 한국항공대학교산학협력단 | Time synchronization apparatus and method for mimo-ofdm based system |
| CN114050884A (en) * | 2021-11-08 | 2022-02-15 | 重庆邮电大学 | Cross-network time synchronization method oriented to industrial wireless and TSN fusion |
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