CN-122027067-A - Time synchronization method, system, equipment and medium for Beidou common view and optical fiber synchronization

CN122027067ACN 122027067 ACN122027067 ACN 122027067ACN-122027067-A

Abstract

The invention discloses a time synchronization method, a system, equipment and a medium for Beidou common view and optical fiber synchronization, which relate to multiplexing communication and comprise the steps of determining a first time deviation of a common view master station node, a second time deviation of each common view user node and a third time deviation of each optical fiber slave station node based on observation data and standard time received by each node, performing data verification and deviation comparison based on the observation data, the first time deviation and the second time deviation, performing cross verification of a satellite channel and an optical fiber channel based on the first time deviation and the third time deviation until the two channels pass verification, inputting the second time deviation, the third time deviation and local Zhong Shuxing parameters into a preset fusion model to obtain target time estimation, and correcting local time corresponding to each node based on the target time estimation to obtain a synchronous time signal. The invention can realize high-precision time synchronization of each node.

Inventors

HE CHEN
YANG HONGZHEN
XIANG YU
WANG SHANHE
GAO YUANYUAN
HE LE
HUANG QIHANG
ZHANG MINGXI
ZHAO JIANPENG

Assignees

国网浙江省电力有限公司信息通信分公司

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. The time synchronization method for synchronizing Beidou common view and optical fibers is characterized by comprising the following steps of: determining a first time deviation of a common-view master station node, a second time deviation of each common-view user node and a third time deviation of each optical fiber slave station node based on observation data and standard time received by each node, wherein the nodes comprise the common-view master station node, the common-view user node and the optical fiber slave station node; Performing data verification and deviation comparison of a satellite channel based on the observed data, the first time deviation and the second time deviation, and performing cross verification of the satellite channel and the optical fiber channel based on the first time deviation and the third time deviation until both channels pass verification; inputting the second time deviation, the third time deviation and the local Zhong Shuxing parameters into a preset fusion model to evaluate noise characteristic self-adaptive adjustment weights of all the observed data in real time to obtain target time estimation, and correcting local time corresponding to each node based on the target time estimation to obtain synchronous time signals.
2. The method for synchronizing Beidou common view with optical fibers according to claim 1, wherein the inputting the second time deviation, the third time deviation and local Zhong Shuxing parameters into a preset fusion model to evaluate noise characteristic self-adaptive adjustment weights of each observation data in real time to obtain a target time estimate is specifically as follows: Taking the second time deviation and the third time deviation as observation input quantities, and taking a local Zhong Shuxing parameter as a state variable to input a preset fusion model, wherein the local clock attribute parameter comprises phase deviation, frequency deviation and frequency drift, and the fusion model is a multi-feature Kalman filtering model; Calculating an innovation sequence and a noise covariance of each observation data in real time, evaluating noise characteristics based on the innovation sequence and the noise variances, and dynamically adjusting a weight ratio of a Beidou common-view path and an optical fiber synchronization path based on the noise characteristics to obtain an adjustment weight; And carrying out weighted fusion on the second time deviation and the third time deviation based on the adjustment weight, and outputting a target time estimated value.
3. The method for synchronizing Beidou common view with optical fibers according to claim 1, wherein the determining a first time deviation of a common view master station node, a second time deviation of each common view user node and a third time deviation of an optical fiber slave station node based on observation data and standard time received by each node is specifically as follows: The co-vision master station node obtains Beidou observation data by receiving Beidou satellite signals, obtains first time deviation based on the Beidou observation data and standard time, encrypts the Beidou observation data and the first time deviation through an encryption algorithm, and obtains encrypted data, wherein the observation data comprises Beidou observation data and local observation data; the common view user node analyzes the received encrypted data to obtain the Beidou observation data, and calculates a second time deviation based on the Beidou observation data, the local observation data and the standard time; And the optical fiber slave station node performs bidirectional time signal comparison through a loop-back optical fiber link between the optical fiber slave station node and the master clock node so as to determine a third time deviation based on a comparison result.
4. The time synchronization method for synchronizing Beidou common view with optical fibers according to claim 1, wherein the data verification and deviation comparison of satellite channels are performed based on the observation data, the first time deviation and the second time deviation, and the cross verification of the satellite channels and the optical fiber channels is performed based on the first time deviation and the third time deviation until both channels pass the verification, specifically: performing data verification on satellite channels on the observation data received by the common-view master station node and each common-view user node until verification is passed, and comparing the first time deviation corresponding to the common-view master station node on the satellite channels after the data verification is passed with the second time deviation corresponding to the common-view user node until a deviation comparison result meets a first preset condition; And performing cross verification of the optical fiber channel by comparing the first time deviation corresponding to the common view master station node on the satellite channel with the third time deviation of each optical fiber slave station node on the optical fiber channel until the cross verification is passed.
5. The method for synchronizing Beidou common view with optical fibers according to claim 4, wherein the step of performing data verification of a satellite channel on the observation data received by the common view master station node and each common view user node until verification is passed is specifically as follows: verifying whether satellite positions calculated by ephemeris data of the same satellite reported by the common-view master station node and each common-view user node are consistent with each other or not and whether the signal to noise ratio of the observed data corresponding to the common-view master station node and each common-view user node is higher than a preset threshold or not; And if the satellite positions are inconsistent, or the weekly second counts are inconsistent, or the signal to noise ratio is lower than a preset threshold, disabling the observed data of the corresponding node until the satellite positions are consistent, the weekly second counts are consistent, and the signal to noise ratio is higher than the preset threshold, and passing the verification.
6. The method for synchronizing Beidou common view with optical fibers according to claim 4, wherein the comparison between the first time deviation corresponding to the common view master station node and the second time deviation corresponding to the common view user node on the satellite channel after the data verification is performed until a deviation comparison result meets a first preset condition is specifically as follows: performing time stamp alignment processing on the first time deviation corresponding to the common-view master station node and the second time deviation corresponding to the common-view user node on the satellite channel passing through data verification, and calculating a deviation comparison result of the aligned first time deviation and second time deviation; And if the deviation comparison result is larger than a preset first preset threshold value or the difference jump in the adjacent period is larger than a second preset threshold value, and the difference jump in the adjacent period in the preset times is larger than the second preset threshold value, the deviation comparison result meets a first preset condition.
7. The method for synchronizing Beidou common view with optical fibers according to claim 4, wherein the cross-verifying of the optical fiber channels is performed by comparing the first time deviation corresponding to the common view master station node on the satellite channel and the third time deviation of each optical fiber slave station node on the optical fiber channels by deviation until the cross-verifying is passed, specifically: Performing space-time reference unified processing on the first time deviation corresponding to the common-view master station node on the satellite channel and the third time deviation of each optical fiber slave station node on the optical fiber channel through deviation comparison, and calculating the deviation value of the unified first time deviation and third time deviation; and if the deviation value is in the preset cross-validation threshold range and the deviation fluctuation is smaller than the fluctuation threshold, the cross-validation result is proved to meet a second preset condition.
8. The Beidou common view and optical fiber synchronization time synchronization system is characterized by comprising an acquisition module, a verification module and a synchronization module; the acquisition module is used for determining a first time deviation of the common-view master station node, a second time deviation of each common-view user node and a third time deviation of each optical fiber slave station node based on the observation data and the standard time received by each node, wherein the nodes comprise the common-view master station node, the common-view user node and the optical fiber slave station node; The verification module is used for carrying out data verification and deviation comparison of the satellite channel based on the observed data, the first time deviation and the second time deviation, and carrying out cross verification of the satellite channel and the optical fiber channel based on the first time deviation and the third time deviation until both channels pass verification; The synchronization module is configured to input the second time deviation, the third time deviation and the local Zhong Shuxing parameters into a preset fusion model, so as to evaluate noise characteristics of each observation data in real time, adaptively adjust weights, obtain a target time estimate, and correct local time corresponding to each node based on the target time estimate, so as to obtain a synchronization time signal.
9. A terminal device comprising one or more processors, a memory coupled to the processors for storing one or more programs, which when executed by the one or more processors, cause the one or more processors to implement the steps of the time synchronization method for synchronization of beidou common view with an optical fiber as claimed in any one of claims 1-7.
10. A computer readable storage medium comprising a stored computer program, wherein the computer program, when run, controls a device in which the computer readable storage medium is located to perform the steps of the time synchronization method for Beidou common view synchronization with optical fibers as claimed in any one of claims 1-7.

Description

Time synchronization method, system, equipment and medium for Beidou common view and optical fiber synchronization Technical Field The invention relates to the field of multiplexing communication, in particular to a time synchronization method, a system, equipment and a medium for synchronizing Beidou common view and optical fibers. Background With the popularization of optical communication networks, optical fiber time transfer technology has become an important means of high-precision time synchronization, and is particularly suitable for the scenes of power backbone networks, 5G carrier networks, data center interconnection and the like. The existing optical fiber time synchronization scheme mostly adopts a bidirectional wavelength division multiplexing technology, and realizes high-precision time comparison between master nodes and slave nodes through a loop-back optical fiber link, wherein the precision can reach the sub hundred picoseconds. However, the coverage of the optical fiber network is limited, and it is difficult to meet the time synchronization requirement of the wide area distribution node. The Beidou satellite common view technology has wide area coverage capability, but signals are easy to interfere and deception, and single-satellite time service precision is limited. In the prior art, a 'main-standby switching' mode is mostly adopted for the fusion of the Beidou common view and the optical fiber synchronization, satellite time service is taken as a main time source, optical fiber time service is taken as a standby source, the optical fiber channel is switched to only when a satellite signal is out of lock or the precision is out of tolerance, and meanwhile, a fusion algorithm mostly adopts a weighted average method with fixed weight to process two paths of time data. The method has the advantages that the method is simple in structure, convenient to use, low in cost and convenient to use, and has the advantages that the method is convenient to use, the time-varying reliability of each time source is not considered in a fixed weight algorithm, the fusion precision is reduced when the satellite suffers intermittent interference, the optical fiber link fault is recovered manually, and the space-time reference difference of satellite-ground data is not accurately calibrated, so that the reliability and the precision of the system are further reduced. Disclosure of Invention The invention provides a time synchronization method, a system, equipment and a medium for Beidou common view and optical fiber synchronization, which can realize high-precision time synchronization of all nodes. An embodiment of the invention provides a time synchronization method for Beidou common view and optical fiber synchronization, which comprises the following steps: determining a first time deviation of a common-view master station node, a second time deviation of each common-view user node and a third time deviation of each optical fiber slave station node based on observation data and standard time received by each node, wherein the nodes comprise the common-view master station node, the common-view user node and the optical fiber slave station node; Performing data verification and deviation comparison of a satellite channel based on the observed data, the first time deviation and the second time deviation, and performing cross verification of the satellite channel and the optical fiber channel based on the first time deviation and the third time deviation until both channels pass verification; inputting the second time deviation, the third time deviation and the local Zhong Shuxing parameters into a preset fusion model to evaluate noise characteristic self-adaptive adjustment weights of all the observed data in real time to obtain target time estimation, and correcting local time corresponding to each node based on the target time estimation to obtain synchronous time signals. The method and the device realize accurate quantification of multi-node and multi-path time references by respectively calculating the time deviation of each node, provide original data support for subsequent synchronous correction, avoid single-sided performance of single-node or single-link deviation measurement, systematically eliminate abnormal data caused by signal interference, deception attack or equipment failure through a progressive verification mechanism formed by data verification, deviation comparison and cross verification, ensure the data reliability of an input fusion model, automatically bias fusion results to a high-reliability data source by dynamically adjusting weights through real-time evaluation of noise characteristics, thereby remarkably improving the accuracy and robustness of target time estimation, and avoid phase jump in the correction process based on the local time correction of the target time estimation, ensure the continuity and stability of synchronous time signals, and finally realize high-accuracy s