A sagnac delay correction method and system for optical fiber time-frequency transmission lacking path information
A technology of delay correction and path information, applied in transmission systems, electromagnetic wave transmission systems, electrical components, etc., can solve problems such as the limited ability of Sagnac delay correction, to solve the problem of low time-frequency transmission accuracy and improve optical fiber time-frequency transmission. effect of ability
Active Publication Date: 2021-12-10
SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI +2
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[0004] The present invention provides a Sagnac time-delay correction method and system for optical fiber time-frequency transmission lacking path information, and solves the problem that the current Sagnac time-delay correction system cannot describe the optical fiber path on the surface well and make the Sagnac time delay correction system insufficient in the position information of the optical fiber path Postponement of limited capacity issues
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[0052] Below in conjunction with the drawings, preferred embodiments of the present invention are given and described in detail.
[0053] Such as figure 1 As shown, a kind of optical fiber time-frequency transmission Sagnac delay correction method of poor path information of a preferred embodiment of the present invention comprises the following steps:
[0054] Step S1, obtain the starting end P of the optical fiber path respectively through the optical fiber time-frequency transmission line survey process s latitude and longitude (L s , B s ) and fiber path receiving end P e latitude and longitude (L e , B e ), and obtain the fiber path length D se . where the fiber path length D se It is calculated by multiplying the propagation time of the optical fiber time-frequency transmission signal in the optical fiber by the speed of light.
[0055] During the line survey, in addition to obtaining the latitude and longitude of the starting end and receiving end of the optica...
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The invention relates to a Sagnac delay correction method for optical fiber time-frequency transmission without path information, comprising: obtaining the longitude and latitude of the starting end and the receiving end of the optical fiber path and the length of the optical fiber path; obtaining the position information of the optical fiber path point; obtaining Sagnac through the Sagnac area integral algorithm Directed area, and calculate the Sagnac time-delay correction estimate; By the distance constraint uncertainty algorithm, calculate the uncertainty of the Sagnac time-delay correction estimate; According to the Sagnac time-delay correction estimate and the Sagnac time delay correction estimate Uncertainty, corrected for the time-frequency propagation delay of the fiber link. The Sagnac time-delay correction method and system for optical fiber time-frequency transmission lacking path information of the present invention can improve the time-frequency transmission capability of optical fiber, thereby solving the low accuracy of time-frequency transmission caused by the insufficient amount of optical fiber link position information in the current optical fiber time-frequency system The problem.
Description
technical field [0001] The present invention relates to the technical field of optical fiber time-frequency transmission, in particular to a Sagnac delay correction method and system for optical fiber time-frequency transmission lacking path information. Background technique [0002] Due to the advantages of high precision, high stability and high accuracy, optical fiber time-frequency transmission has received extensive attention and research in high-precision time-frequency transmission systems, and has been successfully applied in time-frequency metrology, radio astronomy and other fields. The high precision and high stability of optical fiber time-frequency transmission determine that the evaluation accuracy of factors affecting optical fiber signal propagation must be raised to a new level. The uncertainty of optical fiber time transmission mainly comes from the time signal modulator and optical fiber chain used. road. The device delay of the time modulator can be corr...
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IPC IPC(8): H04B10/079
CPCH04B10/079
Inventor 王彬陈俊平周建华胡彩波赵鹤王兵浩陈星樊家琛
Owner SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI