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Method for calibrating E1 data frame precision time and processing time mark information

Active Publication Date: 2013-02-06
郑州威科姆华大北斗导航科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The time used by most substations and power stations in the power system is provided by independent system internal clocks. Due to the differences in the internal clocks of each system, there will be a large time deviation between the systems after the system has been running for a long time. , which will bring huge potential safety hazards to the safe operation and production of the power system

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  • Method for calibrating E1 data frame precision time and processing time mark information
  • Method for calibrating E1 data frame precision time and processing time mark information
  • Method for calibrating E1 data frame precision time and processing time mark information

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Embodiment 1

[0036] Embodiment one: see figure 1 , figure 2 , the E1 data frame accurate time calibration and time scale information processing method of the present invention, realize E1 data frame time calibration and time scale information processing by following steps,

[0037] 1) Extract the E1 time message data from the received E1 link data through the E1 signal processing unit, and detect the E1 receiving and sending characteristic signals;

[0038] 2) Control the multiframe length according to E1 receiving and sending characteristic signals to generate sending and receiving punctual point identification signals;

[0039] 3) Use the second pulse signal synchronized with the standard time source (in practice, the second pulse signal with a synchronization accuracy better than 1 μs can be used) as the time reference for time calibration, and obtain the accumulator count value to perform time calibration on the sending and receiving punctual point identification signals. get the ti...

Embodiment 2

[0041] Embodiment two: see Figure 1 to Figure 6 , the E1 data frame accurate time calibration and time scale information processing method of the present invention is different from Embodiment 1 in that, further, in the steps 2) and 3), the extracted time message data is serial-to-parallel converted, and the Extract the write clock and write address generated by the E1 receiving characteristic signal to store the time message data in the internal memory RAM; sample the extracted E1 receiving characteristic signal, and start the accumulator to control the multiframe length to output the corresponding punctual point identification signal After the punctual point identification signal is synchronized, input the clock counting unit to record and latch the time calibration value; read the received message data stored in the internal memory RAM, fill the latched time calibration value into the message data to replace the original time information, and Transfer the new time message ...

Embodiment 3

[0042] Embodiment three: see Figure 1 to Figure 6 , the E1 data frame accurate time calibration and time scale information processing method of the present invention includes two parts: E1 data frame time calibration processing and E1 time message data sending and receiving processing, and the E1 receiving and sending characteristic signals include a frame identification signal and a time slot identification signal . Such as figure 2 As shown, the difference between this embodiment and the previous embodiments is that in the step 3), the steps for time-calibrating the sending and receiving of the punctual point identification signal E1 data frame are as follows:

[0043] a. The E1 signal detection unit detects the external input 2M data stream, extracts the E1 characteristic signal, and detects the extracted signal sequence as follows image 3 shown.

[0044] b. Sampling the E1 characteristic signal. When the edge of the E1 characteristic signal arrives, start the charact...

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Abstract

The invention relates to a method for calibrating E1 data frame precision time and processing time mark information. E1 data frame precision time calibration and time mark information processing are realized by the steps of 1) extracting E1 time message data from received E1 link data by an E1 signal processing unit, and detecting an E1 receiving and sending feature signal; 2) controlling a multiframe length according to the E1 receiving and sending feature signal, and generating a transmitting and receiving precision time point identification signal; 3) acquiring a counted value of an accumulator for performing time calibration on the transmitting and receiving precision time point identification signal by taking a pulse per second signal synchronous with a standard time source as a time reference for time calibration, so as to obtain a time calibration value; and 4) mapping the obtained time calibration value with the extracted time message data, correcting the time calibration value to be matched with the time message data, and sending out the time calibration value through an E1 channel. By adopting the method, a time synchronization system based on an E1 link of a synchronous digital hierarchy (SDH) network is realized, so that high-precision and high-accuracy time calibration on an E1 data frame can be realized.

Description

technical field [0001] The invention relates to an E1 data frame high-precision time calibration and time scale information processing method in the power system communication technology, which can be used to realize a time synchronization system based on an SDH network E1 link. Background technique [0002] With the rapid development of the smart grid, the grid has higher and higher requirements for time synchronization. The time used by most substations and power stations in the power system is provided by independent system internal clocks. Due to the differences in the internal clocks of each system, there will be a large time deviation between the systems after the system has been running for a long time. , which will bring huge potential safety hazards to the safe operation and production of the power system. [0003] At present, the power system has built a complete SDH optical communication network covering the entire network, and the E1 / 2.048Mbits channel has cover...

Claims

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Application Information

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IPC IPC(8): H04J3/06
Inventor 贾小波张蕊吴淑琴李波郭明
Owner 郑州威科姆华大北斗导航科技有限公司
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