Optical fiber time-frequency transmission Sagnac time delay correction method and system for poor 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, achieve low time-frequency transmission accuracy, and improve optical fiber time-frequency transmission. effect of ability
Active Publication Date: 2021-02-23
SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI +2
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Problems solved by technology
[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 an optical fiber time-frequency transmission Sagnac time delay correction method for poor path information. The method comprises the following steps: acquiring longitude and latitude of a starting end and a receiving end of an optical fiber path and the length of the optical fiber path; acquiring position information of the optical fiber path point; obtaining a Sagnac directed area through a Sagnac area integral algorithm, and calculating a Sagnac time delay correction estimated value; calculating the uncertainty of the Sagnac time delay correction estimated value through a distance constraint uncertainty algorithm; and correcting the time-frequency transmission delay of an optical fiber link according to the Sagnac time delay correction estimated value and the uncertainty of the Sagnac time delay correction estimated value. According to the optical fiber time-frequency transmission Sagnac time delay correction method and system for the poor path information, the optical fiber time-frequency transmission capacity can be improved, and therefore the problem that an existing optical fiber time-frequency system is low in time-frequency transmission precision due to the fact that the position information amount of an optical fiber link is insufficient is solved.
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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Login to View More 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