Method for transmitting ultra-precise time frequency signal based on double fibers
A time-frequency, time-frequency transmission technology, applied in multiplexing communication, time-division multiplexing systems, electrical components, etc., can solve problems such as poor transmission accuracy, and achieve the effect of improving accuracy
Active Publication Date: 2016-10-19
四川泰富地面北斗科技股份有限公司
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[0005] Aiming at the technical problem of poor transmission accuracy due to the different lengths and aging of the two optical fibers in the time-frequency signal transmission method in the prior art, the present invention discloses a method for transmitting ultra-precise time-frequency signals based on dual fibers
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[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0024] The present invention discloses a method for transmitting ultra-precise time-frequency signals based on dual fibers, which specifically includes the following steps: Step 1. An ultra-precise time-frequency transmission unit is set at each master station and slave station of network element equipment, so that The ultra-precise time-frequency transfer unit compares the clock of the master station and the clock of the slave station, and obtains the transmission delay T of the two optical fibers for receiving and sending respectively. 1 and T 2 ; Step two, judging whether the transmission delay difference of the tw...
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The invention relates to the field of time synchronization technology, and discloses a method for transmitting an ultra-precise time frequency signal based on double fibers. Particularly, the method comprises the following steps of a first step, arranging an ultra-precise time frequency transmitting unit at each main station and each auxiliary station of network element equipment, comparing a main station clock and an auxiliary station clock by the ultra-precise time frequency transmitting unit, and respectively obtaining transmission time delays T1 and T2 of a receiving fiber and a transmitting fiber; a second step, determining whether difference between transmission time delays of the two fibers exceeds a preset threshold, if yes, entering a third step for starting a fiber time delay equilibrium compensation module, and otherwise, stopping; and the third step, determining the magnitudes of T1 and T2, and compensating the relatively small value in the T1 and T2 by the fiber time delay equilibrium compensation module so that the difference between T1 and T2 is smaller than or equal with the preset threshold. Through arranging the ultra-precise time frequency transmitting unit on each network element, the time delay of the receiving fiber and the transmitting fiber is detected. When the difference between the time delays is larger than the preset threshold, compensation is performed, thereby improving time transmission precision.
Description
technical field [0001] The invention relates to the technical field of optical communication and time synchronization, in particular to a method for transmitting ultra-precise time-frequency signals based on dual fibers. Background technique [0002] The idea and research on optical fiber time transfer in China was first proposed by the National Time Service Center in 2003, and it was proposed that optical fiber TV channel or spread spectrum technology can be used for ultra-precise optical fiber time transfer. In 2006, East China Power Grid Corporation and State Grid Electric Power Research Institute jointly carried out the research work of using SDH optical communication network to transmit ultra-precise standard time and using SDH optical communication network to realize the unified system of power grid time. The Ministry of Information Industry (now under the Ministry of Industry and Information Technology) Research Institute of Telecommunications and the National Time Se...
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IPC IPC(8): H04J3/06
Inventor 彭良福李忠文李有生孟志才李高峰李琦
Owner 四川泰富地面北斗科技股份有限公司