High-precision distributed optical fiber time synchronization method
A distributed optical fiber and time synchronization technology, applied in synchronization devices, digital transmission systems, electrical components, etc., can solve instability, discontinuous time comparison between time synchronization unit and time synchronization center, maintenance and management difficulties, etc. problem, to achieve the effect of continuous two-way time comparison
Active Publication Date: 2016-09-28
SHANGHAI JIAOTONG UNIV
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However, the electrical distributor requires optical / electrical / optical conversion and electrical processing, and is an active device, which will not only introduce additional instability, but also be difficult to maintain and manage
[0006] We have applied for a patent for a high-precision distributed optical fiber two-way time synchronization method and device, but in this method, the two-way time comparison between each time synchronization unit and the time synchronization center is discontinuous
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[0034] Below in conjunction with embodiment and accompanying drawing, the present invention will be further described, and present embodiment is carried out on the premise of technical solution of the present invention, has provided detailed implementation mode and and specific work flow, but protection scope of the present invention is not limited to the following the described embodiment.
[0035] figure 2 It is a schematic diagram of the working process of the embodiment, assuming that the timing signal is 1PPS (one pulse per second). When the time synchronization center receives the instruction, the fiber optic time synchronization center first performs pre-synchronization, and the fiber optic time synchronization center numbers each time synchronization unit sequentially, and uses time synchronization unit 1 as the current time synchronization unit. When the time synchronization center detects the local timing signal , broadcast a connection request containing the addre...
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A high-precision time synchronization method for distributed optical fibers sequentially comprises pre-synchronization and a two-way time comparison. The pre-synchronization refers to that a time synchronization center sequentially performs pre-synchronization with all time synchronization units when receiving a synchronous start instruction; the two-way time comparison refers to that between every two timing messages, the time synchronization center performs the two-way time comparison with all time synchronization units of pre-synchronization through a passive optical distributing network in a TDMA mode, and meanwhile the timing messages of the time synchronization units are dynamically adjusted to avoid conflict between adjacent nodes. On the basis of the two-way time comparison and the passive optical distributing network, through a TDMA access technology, the high-precision point-to-multipoint continuous two-way time comparison based on all-optical channels and passive optical devices is achieved.
Description
technical field [0001] The invention relates to the technical field of optical fiber time-frequency transmission, in particular to a high-precision distributed optical fiber time synchronization method. Background technique [0002] High-precision time synchronization technology has important application value in the fields of satellite navigation, aerospace, deep space exploration, geological surveying and mapping, communication, power transmission, scientific research and measurement. At present, the traditional high-precision time synchronization technology mainly consists of GPS common view and satellite dual time comparison. The equipment required by the GPS common view method is relatively simple and low in cost, but the accuracy is difficult to reach the nanosecond level. Satellite two-way time comparison can achieve high-precision time synchronization, which can reach the sub-nanosecond level, but it needs to use a dedicated satellite communication link. Due to the ...
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IPC IPC(8): H04L7/00H04Q11/00
Inventor 胡亮吴龟灵沈建国黄璜陈建平
Owner SHANGHAI JIAOTONG UNIV