CN105162544A - System time keeping method based on SDH network - Google Patents
System time keeping method based on SDH network Download PDFInfo
- Publication number
- CN105162544A CN105162544A CN201510638653.7A CN201510638653A CN105162544A CN 105162544 A CN105162544 A CN 105162544A CN 201510638653 A CN201510638653 A CN 201510638653A CN 105162544 A CN105162544 A CN 105162544A
- Authority
- CN
- China
- Prior art keywords
- time
- sdh network
- clock
- information
- sdh
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention discloses a system time keeping method based on an SDH network. The world standard time provided by a GPS and Beidou satellite navigation is taken as a clock reference signal for the system; when the time information received by the system from the GPS or in other ways due to weather or other interference is lost, the time information provided by the SDH network is taken as standard time reference for the system and 2.048MHz standard clock provided by the SDH network is taken as a high-accuracy clock source for the system; besides, timing is started to provide the time information. Meanwhile, the time information can be provided for other systems over the SDH network to meet relatively high requirements of the systems on the clock and ensure normal work of the systems.
Description
Technical field
The present invention relates to a kind of system to keep time method for designing, specifically a kind of system based on SDH network is kept time method for designing.
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
A kind of system based on SDH network is the object of the present invention is to provide to keep time method.
The technical solution realizing the object of the invention is: a kind of system based on SDH network is kept time method, system utilizes temporal information extraction module to provide to meet the time of one-level clock time standard as time reference information, when being subject to weather or other interference, when system is lost from the temporal information that GPS or other modes receive, the temporal information that temporal information extraction module is provided by SDH network is as time reference information, and the 2.048MHz standard time clock utilizing SDH network to provide is as high accuracy real-time clock, provides time reference information with timing; Utilize SDH network output time reference information, for other SDH system extraction time and clock information simultaneously.
The present invention compared with prior art, its remarkable advantage: when the UCT of the satellite navigation system such as GPS, the Big Dipper is not effectively received, still can guarantee system time precise synchronization; The SDH network utilizing power communication system intrinsic can realize time synchronized, and the SDH Internet resources not outside occupying volume; The demand of hardware is reduced, reduces design cost.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 inserts temporal information schematic diagram in SDH elementary cell E1.
Fig. 3 is that system is kept time workflow diagram.
Embodiment
A kind of system based on SDH network of the present invention is kept time method, and communication system provides clock reference signal by temporal information extraction module.The universal time that temporal information extraction module preferentially chooses GPS, Beidou satellite navigation provides is as time reference signal; When being subject to weather or other interference, when system is lost from the temporal information that GPS or other modes receive, the temporal information that temporal information extraction module provides by SDH network is as time reference signal, and the 2.048MHz standard time clock utilizing SDH network to provide is as high accuracy real-time clock, provides temporal information with timing.Utilize SDH network outputting standard temporal information, for other SDH system extraction time and clock information simultaneously.
The elementary cell of SDH is one-period totally 32 time slots of E1, E1 agreement, wherein has 30 time slots and can transmit voice and data message.The present invention is by utilizing three time slot filling time information of E1 in SDH network communication protocol, in order to temporal information is transmitted in SDH network, and the standard time clock extracting 2.048MHz in E1 is as high accuracy real-time clock, with the temporal information extracted in SDH network for initial time, provide present clock information by the method for clock timing.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, the system based on SDH network provided by the invention is kept time method for designing, and temporal information extraction module prioritizing selection, based on the standard time source of GPS, Beidou satellite navigation, when above-mentioned time source is lost, selects the time source based on SDH network.The system of Figure 3 shows that is kept time the flow process of work.
UTC(standard zebra time based on the standard time source of GPS, Beidou satellite navigation provides with global positioning system) for reference data, utilize antenna to receive gps signal, the precision time service function of time can be realized.System clock loads Big Dipper synchronization module or GPS module, and the clock using Big Dipper synchronization module or GPS module to export is as the clock of subsystems.Although satellite synchronization mode precision is higher, the impact by ambient weather is comparatively large, is difficult to the synchronization accuracy that moment maintenance is higher.
When system is lost from the temporal information that GPS or other modes receive, the SDH network the most ripe in electric power system of the present invention is as the medium of clock synchronization system, the standard time clock of 2.048MHz is extracted as high accuracy real-time clock by SDH network, and utilize temporal information embedded in E1 in SDH network as standard time information, current time information is provided by the method for clock timing, not needing to change on the basis of existing network and hardware configuration, system high-precise synchronization can be realized.Meanwhile, temporal information is inserted in the E1 time slot in SDH network by system equally, uses for other Time keeping system.Fig. 2 inserts temporal information schematic diagram in SDH elementary cell E1.
The clock extracted from the E1 of SDH, its frequency is 2.048MHz, and the clock cycle of namely recovering is about 500ns, and time timing worst error was 1/2nd clock cycle, and therefore the clock synchronization accuracy of system is 250ns.
Claims (5)
1. the system based on SDH network is kept time method, it is characterized in that: system utilizes temporal information extraction module to provide to meet the time of one-level clock time standard as time reference information, when being subject to weather or other interference, when system is lost from the temporal information that GPS or other modes receive, the temporal information that temporal information extraction module is provided by SDH network is as time reference information, and the 2.048MHz standard time clock utilizing SDH network to provide is as high accuracy real-time clock, provides time reference information with timing; Utilize SDH network output time reference information, for other SDH system extraction time and clock information simultaneously.
2. the system based on SDH network according to claim 1 is kept time method, it is characterized in that: the universal time that described temporal information extraction module preferentially chooses GPS, Beidou satellite navigation provides is as time reference information.
3. the system based on SDH network according to claim 1 is kept time method, it is characterized in that: system when other reference time information cannot obtain, by extracting the temporal information transmitted in SDH network basic communication unit E1 as time reference information.
4. the system based on SDH network according to claim 1 is kept time method, it is characterized in that: extract the 2.048MHz standard time clock of SDH network as high accuracy real-time clock, and utilizing 2.048MHz standard time clock as system timing clock, timing output time information, to realize punctual function.
5. the system based on SDH network according to claim 1 is kept time method, it is characterized in that: by inserting time reference information in SDH network basic communication unit E1, utilize SDH network latency, for other punctual equipment use of system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510638653.7A CN105162544A (en) | 2015-09-30 | 2015-09-30 | System time keeping method based on SDH network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510638653.7A CN105162544A (en) | 2015-09-30 | 2015-09-30 | System time keeping method based on SDH network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105162544A true CN105162544A (en) | 2015-12-16 |
Family
ID=54803316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510638653.7A Pending CN105162544A (en) | 2015-09-30 | 2015-09-30 | System time keeping method based on SDH network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105162544A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923315A (en) * | 2009-06-17 | 2010-12-22 | 华东电力试验研究院有限公司 | Time synchronization method of electric power system and device thereof |
| CN102023567A (en) * | 2010-10-21 | 2011-04-20 | 国网电力科学研究院 | High-precision time service method for multi-time-source comprehensive calculation |
| CN102158298A (en) * | 2011-05-05 | 2011-08-17 | 中国人民解放军理工大学 | High-accuracy time frequency delivery method based on synchronous digital hierarchy (SDH) optical network |
| US20130039359A1 (en) * | 2010-04-21 | 2013-02-14 | Lsi Corporation | Time Synchronization Using Packet-Layer and Physical-Layer Protocols |
| CN203101856U (en) * | 2012-11-21 | 2013-07-31 | 中国电力科学研究院 | Time synchronization system used for electric power communication |
-
2015
- 2015-09-30 CN CN201510638653.7A patent/CN105162544A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923315A (en) * | 2009-06-17 | 2010-12-22 | 华东电力试验研究院有限公司 | Time synchronization method of electric power system and device thereof |
| US20130039359A1 (en) * | 2010-04-21 | 2013-02-14 | Lsi Corporation | Time Synchronization Using Packet-Layer and Physical-Layer Protocols |
| CN102023567A (en) * | 2010-10-21 | 2011-04-20 | 国网电力科学研究院 | High-precision time service method for multi-time-source comprehensive calculation |
| CN102158298A (en) * | 2011-05-05 | 2011-08-17 | 中国人民解放军理工大学 | High-accuracy time frequency delivery method based on synchronous digital hierarchy (SDH) optical network |
| CN203101856U (en) * | 2012-11-21 | 2013-07-31 | 中国电力科学研究院 | Time synchronization system used for electric power communication |
Non-Patent Citations (2)
| Title |
|---|
| 吴玉林等: "基于SDH时钟的变电站时间同步装置高精度守时方法研究", 《中国电业（技术版）》 * |
| 陈宁，李洪涛等: "电力系统中基于SDH的时间同步系统研究", 《科学技术与工程》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203164620U (en) | High precision time synchronization device | |
| CN204964762U (en) | General big dipper positioning orientation time service equipment of radar | |
| CN101795020B (en) | Automatic time-tick synchronization system of intelligent electronic equipment of transformer substation | |
| CN103401672A (en) | Time synchronization device, equipment and system | |
| CN202694021U (en) | Substation time synchronizing system | |
| CN202475441U (en) | Power system time synchronization device based on precision time protocol | |
| CN105446917B (en) | The device that the data record and location information of a kind of PPK-RTK obtains | |
| CN101398666A (en) | Big dipper satellite synchronizing clock time signal B code generating method and apparatus | |
| CN105682215A (en) | Clock synchronization method and device as well as cascaded base station system | |
| CN104901291A (en) | Intelligent fiber differential protection synchronization method based on Beidou time service | |
| CN102522741A (en) | Synchronous data acquisition method applied to direct current power grid | |
| CN203465541U (en) | Beidou/GPS double-time service source-based failure time recording device | |
| CN102313859A (en) | Method and system for positioning fault of underground cable on basis of IEEE 1588 (network measurement and control system precision clock synchronization protocol) | |
| CN105187150A (en) | SDH network-based clock synchronizing system | |
| CN105471540A (en) | Beidou GPS clock synchronization system based on wind power converter | |
| CN102938677B (en) | Shore station time synchronization method for undersea observational network | |
| CN103220774A (en) | Precise timing method and precise timing system with assistance of cellular network | |
| CN105759600A (en) | Beidou Satellite-based power grid system time-service system | |
| CN103001632A (en) | CPLD-based (complex programmable logic device-based) GPS (global positioning system) synchronous sampling circuit | |
| CN203166942U (en) | Time synchronization device based on IEEE1588 protocol | |
| Wang et al. | A novel clock synchronization architecture for IoT access system | |
| CN103036314A (en) | Inserted electricity parameter sampling realization device based on time-base signals of compass navigation satellite system and global position system (GPS) | |
| CN105162544A (en) | System time keeping method based on SDH network | |
| CN104219014A (en) | PTP clock synchronization method based on SDH transmission network | |
| CN104901423A (en) | Transmission time mark wide area phasor differential protection method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151216 |
|
| RJ01 | Rejection of invention patent application after publication |