CN105187150A - SDH network-based clock synchronizing system - Google Patents
SDH network-based clock synchronizing system Download PDFInfo
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- CN105187150A CN105187150A CN201510634519.XA CN201510634519A CN105187150A CN 105187150 A CN105187150 A CN 105187150A CN 201510634519 A CN201510634519 A CN 201510634519A CN 105187150 A CN105187150 A CN 105187150A
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Abstract
The invention discloses an SDH network-based clock synchronizing system. The system mainly comprises a primary clock device, an SDH network and a secondary clock device. The time signals of the primary clock device come from four sources: world standard time provided by GPS satellite, world standard time provided by Beidou Satellite and time information timed by a caesium clock and a recovered clock from the SDH network, and the optimum time information is selected through a probability optimization algorithm; the SDH network is connected with the primary clock device and the secondary clock device; and the secondary clock device is not only capable of adopting the primary clock device to provide standard time signals, but also capable of adopting the world standard time provided by GPS or Beidou satellite navigation as time information. According to the SDH network-based clock synchronizing system, the existing communication resources are adequately utilized and the accurate synchronization with accuracy in nanosecond can be realized; and the optimum time information is selected through the probability optimization algorithm, so that the stability and reliability of the clock system are improved.
Description
Technical field
The present invention relates to time synchronized field, specifically a kind of clock system based on SDH network.
Background technology
In electric power system, the places such as circuit communication scheduling net, power plant and transformer station all need point-device time synchronized to control.The time synchronized deviation of millisecond or Microsecond grade can cause the interruption of system, and the even paralysis of electrical network, brings huge loss to client and Utilities Electric Co..Therefore, high-precision clock synchronization system is the necessary requirement ensureing that various power communication is unimpeded.
The method generally used in the world is at present the UTC(universal time being received the satellite navigation system such as GPS, the Big Dipper by clock synchronization system) and be applied to each communication apparatus needing accurate clock, to realize the time synchronized of various communication apparatus.Although GPS time dissemination system is the technology the most generally used at present, it has following shortcoming: (1) is the GPS (Global Position System) that US military provides due to GPS, controls by US military, does not ensure; (2) antenna maintenance costly, needs lightning protection waterproof measure, at the more numerous and disorderly city of wireless signal and power equipment periphery, is vulnerable to interference; (3) the Special Geographic form in city can make the satellite reception visual field be restricted, and is difficult to ensure that continuous reception is to enough satellite-signals.
Summary of the invention
The object of the present invention is to provide a kind of clock system based on SDH network.
The technical solution realizing the object of the invention is: a kind of clock system based on SDH network, and clock system is by clock equipment, SDH network and form from clockwork;
Clock equipment, its time signal has four kinds of sources, is respectively gps satellite navigation, Beidou satellite navigation, caesium clock and takes from the recovery time of SDH network; Wherein GPS, Beidou satellite navigation provide universal time as clock reference signal; The 2.048MHz standard time clock that the recovery time of taking from SDH network extracts in SDH network, as high accuracy real-time clock, with the time of extracting in SDH network or caesium clock for initial time, provides current time information by the method for clock timing; Clock equipment chooses Best Times information by probability optimization algorithm from four kinds of temporal informations, for whole time synchronization network provides time reference signal;
SDH network, connect clock equipment with from clockwork, for receiving and sending the time reference signal that clock equipment provides, realize precise synchronization by time slot calibration synchronized algorithm; Meanwhile, SDH network to clock equipment, provide recovered clock from clockwork, other information transmission of not influential system simultaneously;
From clockwork, its time signal source is respectively the clock equipment temporal information, gps satellite navigation, Beidou satellite navigation, the caesium clock that receive SDH network and transmit and takes from the recovered clock of SDH network; Preferentially choose the clock equipment standard time information receiving SDH network and transmit from clockwork, from other four kinds of temporal informations, choose Best Times information by probability optimization algorithm when this information dropout.
The present invention compared with prior art, its remarkable advantage: by SDH network connect clock equipment with from clockwork, provide recovered clock by SDH network simultaneously, make full use of the existing communication resource; Clock equipment, all adopt four kinds of temporal informations from clockwork, and determine optimum clock source by probability optimization algorithm, greatly improve stability and the reliability of clock system.
Accompanying drawing explanation
Fig. 1 is the overall construction drawing of system.
Fig. 2 is probability optimization algorithm block diagram.
Embodiment
Based on the clock system of SDH network by clock equipment, SDH network and form from clockwork.
The temporal information of clock equipment has four kinds of sources, is respectively gps satellite navigation, Beidou satellite navigation, caesium clock and takes from the time of SDH network.Wherein GPS, Beidou satellite navigation provide universal time as time reference information; The 2.048MHz standard time clock that the recovered clock taking from SDH network is extracted in SDH network is as high accuracy real-time clock, caesium clock and take from SDH network recovered clock with temporal information original in system for initial time, provide present clock information by the method for clock timing.Clock equipment chooses Best Times information by probability optimization algorithm, for whole time synchronization network provides standard time information.First probability optimization algorithm asks four kinds of averages of originating, and then asks mean square deviation with often kind of source with average, with the clock system clock output the most that mean square deviation is minimum, obtains the clock signal source of optimum probability.
When clock equipment chooses optimal clock source by probability optimization algorithm, just repeat this algorithmic procedure at set intervals, to prevent from disturbing, the circuit topological structure change institute clock that becomes of photograph changes.
SDH network, connect clock equipment with from clockwork, for receiving and sending the standard time information that clock equipment provides, realize precise synchronization by time slot calibration synchronized algorithm.Meanwhile, SDH network provides recovered clock to master and slave clockwork, simultaneously other information transmission of not influential system.
In time slot alignment time synchronized algorithm, from clockwork and clock equipment the Basic Transmission Unit E1 in SDH network certain time slot bit position transmission time information after timing, from clockwork after the temporal information receiving master clock transmission, stop timing, and clocking information is sent to master clock again, system is poor according to timing, readjusts transmitting time, standard time is added one-way time difference as new temporal information with calibration from the temporal information of clock, realize time synchronized.
Standard time information that the clock equipment standard information, GPS, the big-dipper satellite that receive SDH network and transmit provide is respectively, by caesium clock and the temporal information of recovered clock timing taking from SDH network from its time signal of clockwork source.Preferentially choose the clock equipment standard information of reception SDH network transmission as Best Times information from clockwork, from other four kinds of temporal informations, choose Best Times information by probability optimization algorithm when this dropout.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, this system is by clock equipment, SDH network and form from clockwork.
Clock equipment, for whole time synchronization network provides time reference signal.As shown in Figure 1, the standard time information provided by gps satellite, big-dipper satellite, by caesium clock and take from SDH network the temporal information of recovered clock timing as four kinds of sources of clock equipment time signal.Optimal clock source is chosen by probability optimization algorithm in four kinds of sources, is then supplied to clock equipment.
As shown in Figure 2, first probability optimization algorithm asks four kinds of averages of originating, and then asks mean square deviation with often kind of source with average, with the clock system clock output the most that mean square deviation is minimum, obtains the clock signal source of optimum probability.
When clock equipment chooses optimal clock source by probability optimization algorithm, just repeat this algorithmic procedure at set intervals, to prevent from disturbing, the circuit topological structure change institute clock that becomes of photograph changes.
SDH network, connect clock equipment with from clockwork, for receiving and sending the time reference signal that clock equipment provides, and provide recovered clock to clock equipment, simultaneously other information transmission of not influential system.
Standard time information that the clock equipment standard signal, gps satellite, the big-dipper satellite that receive SDH network and transmit provide is respectively, by caesium clock or the temporal information of recovered clock timing taking from SDH network from the time signal of clockwork source.Preferentially choose the clock equipment temporal information of reception SDH network transmission as Best Times information from clockwork, from other four kinds of temporal informations, choose Best Times information by probability optimization algorithm when this dropout.With the clock system clock output the most that mean square deviation is minimum, obtain the clock signal source of optimum probability.
Clock synchronization system of the present invention is hub-and-spoke configuration, namely together clock equipment for while multiple stage provide time service service from clockwork, be called as secondary time server from clockwork, the synchronization accuracy of secondary time server declines to some extent, but still meets application demand.
The present invention makes full use of the existing communication resource, can realize the precise synchronization of precision in nanosecond, and choose Best Times information by probability optimization algorithm, improves stability and the reliability of clock system.
Claims (4)
1. based on a clock system for SDH network, it is characterized in that: clock system is by clock equipment, SDH network and form from clockwork;
Clock equipment, its time signal has four kinds of sources, is respectively gps satellite navigation, Beidou satellite navigation, caesium clock and takes from the recovery time of SDH network; Wherein GPS, Beidou satellite navigation provide universal time as clock reference signal; The 2.048MHz standard time clock that the recovery time of taking from SDH network extracts in SDH network, as high accuracy real-time clock, with the time of extracting in SDH network or caesium clock for initial time, provides current time information by the method for clock timing; Clock equipment chooses Best Times information by probability optimization algorithm from four kinds of temporal informations, for whole time synchronization network provides time reference signal;
SDH network, connect clock equipment with from clockwork, for receiving and sending the time reference signal that clock equipment provides, realize precise synchronization by time slot calibration synchronized algorithm; Meanwhile, SDH network to clock equipment, provide recovered clock from clockwork, other information transmission of not influential system simultaneously;
From clockwork, its time signal source is respectively the clock equipment temporal information, gps satellite navigation, Beidou satellite navigation, the caesium clock that receive SDH network and transmit and takes from the recovered clock of SDH network; Preferentially choose the clock equipment standard time information receiving SDH network and transmit from clockwork, from other four kinds of temporal informations, choose Best Times information by probability optimization algorithm when this information dropout.
2. the clock system based on SDH network according to claim 1, it is characterized in that: described time slot alignment time synchronized algorithm, from clockwork and clock equipment the Basic Transmission Unit E1 in SDH network certain time slot bit position transmission time information after timing, from clockwork after the temporal information receiving master clock transmission, stop timing, and clocking information is sent to master clock again, master clock system is poor according to twice timing, try to achieve one way transmission time difference, readjust transmitting time, is added one-way time difference the standard time as new temporal information with the temporal information of calibration from clock, realize time synchronized.
3. the clock system based on SDH network according to claim 1, it is characterized in that: described probability optimization algorithm, first four kinds of averages of originating are asked, then mean square deviation is asked with often kind of source with average, with the clock system clock output the most that mean square deviation is minimum, obtain the clock signal source of optimum probability.
4. the clock system based on SDH network according to claim 1, it is characterized in that: clock equipment chooses optimal clock source by probability optimization algorithm, just repeat this algorithmic procedure at set intervals, to prevent from disturbing, circuit topological structure change the clock that causes and changes.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106788848A (en) * | 2016-12-29 | 2017-05-31 | 大唐电信（成都）信息技术有限公司 | A kind of Time Synchronization Network network-building method based on E1 |
| CN106909197A (en) * | 2017-02-28 | 2017-06-30 | 郑州云海信息技术有限公司 | A kind of virtualized host time management method and virtualized host system |
| CN106921457A (en) * | 2015-12-28 | 2017-07-04 | 北京东土科技股份有限公司 | The synchronous method and device of clock is realized based on SDH network |
| CN112040448A (en) * | 2020-09-08 | 2020-12-04 | 广州市埃特斯通讯设备有限公司 | Time synchronization method for V2X equipment applied to tunnel |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106921457A (en) * | 2015-12-28 | 2017-07-04 | 北京东土科技股份有限公司 | The synchronous method and device of clock is realized based on SDH network |
| CN106921457B (en) * | 2015-12-28 | 2018-09-11 | 北京东土科技股份有限公司 | The method and device that clock synchronizes is realized based on SDH network |
| CN106788848A (en) * | 2016-12-29 | 2017-05-31 | 大唐电信（成都）信息技术有限公司 | A kind of Time Synchronization Network network-building method based on E1 |
| CN106788848B (en) * | 2016-12-29 | 2019-05-03 | 大唐电信（成都）信息技术有限公司 | A kind of Time Synchronization Network network-building method based on E1 |
| CN106909197A (en) * | 2017-02-28 | 2017-06-30 | 郑州云海信息技术有限公司 | A kind of virtualized host time management method and virtualized host system |
| CN106909197B (en) * | 2017-02-28 | 2020-02-07 | 郑州云海信息技术有限公司 | Virtualization host time management method and virtualization host system |
| CN112040448A (en) * | 2020-09-08 | 2020-12-04 | 广州市埃特斯通讯设备有限公司 | Time synchronization method for V2X equipment applied to tunnel |
| CN112040448B (en) * | 2020-09-08 | 2023-08-08 | 广州市埃特斯通讯设备有限公司 | Time synchronization method for applying V2X equipment to tunnel |
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