Time service difference correction method and system and storage medium
By measuring and correcting the time difference between the long-wave and short-wave timing system and the foundation fiber timing system in the differential correction station, the differential correction amount is transmitted by 4G/5G communication base station, the problem of insufficient timing accuracy in the existing technology is solved, and a high-precision and low-cost timing system is realized.
Patent Information
- Application Number
- CN202411882284.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-03-28
AI Technical Summary
In the prior art, the time code accuracy obtained by the user terminal of the long-wave and short-wave timing system is poor, while the high-precision foundation fiber timing system is costly and difficult to set up.
By completing the time difference measurement of the long-wave timing system, the short-wave timing system and the foundation fiber timing system in the differential correction station, the time difference of each system is obtained, and the differential correction amount is transmitted to the timing system through the 4G/5G communication base station for time difference correction, forming a closed-loop feedback system that integrates heaven and earth.
It realizes high-precision time code correction of each timing system, ensuring that the user can obtain high-precision time code in real time, and ensures the reliability and credibility of timing through verification.
Smart Images
Figure CN119727985A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of communication technology, and in particular to a timing differential correction method, system and storage medium. Background Art
[0002] The timing systems in the field of time unification mainly use three types of timing systems, namely long-wave timing, short-wave timing and ground-based optical fiber timing. Among them, long-wave timing has strong anti-interference ability, a propagation distance of about 800Km, and a low timing accuracy of about 50ns. Short-wave timing mainly relies on satellite systems with weak anti-interference ability, is not limited by propagation distance, and is greatly affected by terrain obstruction. The timing accuracy can reach the order of 10ns. The ground-based optical fiber timing system relies on optical fiber timing, which is a wired timing method with strong anti-interference ability and excellent timing accuracy, which can reach the order of 100ps. However, because it is a wired timing system, the laying cost is high and it is difficult to set up due to terrain restrictions.
[0003] Therefore, the accuracy of the time code obtained by different timing methods at the user end of the long-wave and short-wave timing systems is poor, while the cost of obtaining the time code through high-precision ground-based optical fiber timing is too high. Summary of the invention
[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a timing differential correction method, system and storage medium.
[0005] The object of the present invention is achieved through the following technical solutions: The first aspect of the present invention provides: a timing difference correction method, comprising the following steps: S1: Obtain 1PPS+TOD of the ground-based optical fiber timing system as the ground time base; S2: Receive the time code of the long-wave timing system and the short-wave timing system, and demodulate 1PPS+TOD; S3: Complete the time difference measurement between the long-wave timing system, the short-wave timing system and the ground time base inside the differential correction station to obtain the long-wave timing time difference T1, the GNSS timing time difference T2, and the communication base station time difference T3; S4: Send the differential correction of each time difference to the long-wave timing station and the short-wave timing system to correct the time difference of each system; S5: Conduct integrated measurement and real-time correction of each timing system to form a closed-loop feedback system integrating the sky and the earth.
[0006] Preferably, the shortwave timing system includes: GNSS satellite navigation timing system, 4G LTE, and 5G NR terminal timing system.
[0007] Preferably, the ground-based optical fiber timing system comprises a UTC time reference source, the UTC time reference source is connected to an optical fiber time and frequency synchronization device, the optical fiber time and frequency synchronization device is connected to a relay device, the relay device is connected to a ground-based optical fiber timing reference station; the ground-based optical fiber timing reference station is connected to a differential correction station, the differential correction station is connected to a communication base station, a long-wave timing system and a short-wave timing system; the communication base station is connected to a long-wave timing system and a long- and short-wave timing system user terminal; the long- and short-wave timing system user terminal is connected to a long-wave timing system and a short-wave timing system; The ground-based optical fiber timing reference station is used to send the ground time base to the differential correction station; when the differential correction station receives the ground time base, it calculates the long-wave and short-wave differential correction values and sends them to the communication base station; the communication base station sends the long-wave and short-wave differential correction values to the long-wave timing system and the long- and short-wave timing system user end for accuracy correction and correction verification.
[0008] The second aspect of the present invention provides: a timing differential correction system, used to implement any of the above-mentioned timing differential correction methods, comprising: Ground time base acquisition module, used to obtain 1PPS+TOD of the ground-based optical fiber timing system as the ground time base; Demodulation module, used to receive time codes of long-wave timing system and short-wave timing system, and demodulate 1PPS+TOD; The time difference measurement module is used to complete the time difference measurement between the long-wave timing system, the short-wave timing system and the ground time base inside the differential correction station, and obtain the long-wave timing time difference T1, the GNSS timing time difference T2, and the communication base station time difference T3; The time difference correction module is used to send the differential correction amount of each time difference to the long-wave timing station and the short-wave timing system to correct the time difference of each system; The real-time correction module is used to perform integrated measurement and real-time correction of each timing system to form a closed-loop feedback system integrating the space and the earth.
[0009] The third aspect of the present invention provides: a computer-readable storage medium, wherein the computer stores computer-executable instructions, and when the computer-executable instructions are loaded and executed by a processor, any of the above-mentioned timing differential correction methods is implemented.
[0010] The beneficial effects of the present invention are: 1) The time difference of each system is used as a differential correction value and transmitted to the long-wave timing system and the short-wave timing system through the current mature communication base station 4G / 5G network to complete the timing accuracy correction. At the same time, the long-wave and short-wave timing system user terminals are connected for correction verification to ensure that the user terminal can obtain high-precision time codes in real time and can verify the current timing quality in real time, ensure the reliability of timing, and ensure that the current time is reliable.
[0011] 2) It is only necessary to build a high-precision optical fiber synchronization link between the ground-based optical fiber timing system and the long- and short-wave timing differential correction station, and complete long-wave demodulation, short-wave demodulation, and high-precision time difference measurement in the long-wave and short-wave timing differential correction stations to obtain the differential correction values of each timing system.
[0012] 3) Only by setting up a high-cost optical fiber timing system once, the corrected high-precision and reliable time code can be provided to the long-wave timing system and short-wave timing system user end.
[0013] 4) Supports the expansion of multiple differential correction stations. More differential correction stations can be established to conduct synchronous real-time observation of the source of the long-wave timing system and the short-wave timing system, eliminate observation errors, and obtain higher-precision differential correction values to provide to the user system. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a flow chart of the timing difference correction method; Figure 2 This is the principle block diagram of the ground-based optical fiber timing system. DETAILED DESCRIPTION
[0015] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.
[0016] See also Figure 1-Figure 2 The first aspect of the present invention provides: a timing differential correction method, comprising the following steps: S1: Obtain 1PPS+TOD of the ground-based optical fiber timing system as the ground time base; S2: Receive the time code of the long-wave timing system and the short-wave timing system, and demodulate 1PPS+TOD; S3: Complete the time difference measurement between the long-wave timing system, the short-wave timing system and the ground time base inside the differential correction station to obtain the long-wave timing time difference T1, the GNSS timing time difference T2, and the communication base station time difference T3; S4: Send the differential correction of each time difference to the long-wave timing station and the short-wave timing system to correct the time difference of each system; S5: Conduct integrated measurement and real-time correction of each timing system to form a closed-loop feedback system integrating the sky and the earth.
[0017] In this embodiment, in order to enable users of long-wave and short-wave timing systems in the field of time unification to obtain higher-precision time codes, the present invention adopts a long-wave and short-wave timing differential correction method to achieve the fusion reception of the UTC time reference source, the long-wave timing system time source, and the short-wave timing system time source, and obtains the receiving time difference between each system through ultra-high-precision time difference measurement. If multiple long-wave and short-wave timing differential correction stations are established to simultaneously observe the same long-wave timing system station and short-wave timing system satellite, the accuracy of the differential correction amount of the long-wave timing system and the short-wave timing system can be further improved.
[0018] By completing high-precision optical fiber timing, the UTC reference source time code is transmitted to the long-wave and short-wave timing differential correction station. After receiving the long-wave timing system time code and the short-wave timing system time code in the differential correction station, high-precision measurement and comparison with the UTC reference source time code are completed to obtain the differential correction between the systems, and the real-time correction is encoded. The correction is sent out through the existing mature 4G / 5G communication base station and transmitted to the long-wave timing system and the short-wave timing system user end. The long-wave timing accuracy correction, the user-end long-wave and short-wave timing accuracy correction and verification are realized. Users can obtain high-precision reliable time codes.
[0019] The core of the present invention is to integrate multiple systems through differential correction stations, and use high-precision fiber optic time synchronization, ultra-high precision 1PPS measurement and other methods to obtain differential correction values, and broadcast the user-side differential correction values through existing mature 4G / 5G communication base stations to form an overall high-precision, low-cost design architecture.
[0020] In some embodiments, the shortwave timing system includes: GNSS satellite navigation timing system, 4G LTE, and 5GNR terminal timing system.
[0021] In some embodiments, the ground-based optical fiber timing system includes a UTC time reference source, the UTC time reference source is connected to an optical fiber time and frequency synchronization device, the optical fiber time and frequency synchronization device is connected to a relay device, the relay device is connected to a ground-based optical fiber timing reference station; the ground-based optical fiber timing reference station is connected to a differential correction station, the differential correction station is connected to a communication base station, a long-wave timing system, and a short-wave timing system; the communication base station is connected to a long-wave timing system and a long- and short-wave timing system user terminal; the long- and short-wave timing system user terminal is connected to a long-wave timing system and a short-wave timing system; The ground-based optical fiber timing reference station is used to send the ground time base to the differential correction station; when the differential correction station receives the ground time base, it calculates the long-wave and short-wave differential correction values and sends them to the communication base station; the communication base station sends the long-wave and short-wave differential correction values to the long-wave timing system and the long- and short-wave timing system user end for accuracy correction and correction verification.
[0022] The core purpose of the present invention is to form a multi-system and multi-dimensional fusion architecture, from the time reference source, various levels of timing systems, and the terminal time system, the whole link of time difference measurement, time synchronization monitoring, time difference accuracy correction, timing performance calibration, long-term time stability, reliability, and security of trusted time establishment, to form a full-link closed-loop time dynamic control system.
[0023] The second aspect of the present invention provides: a timing differential correction system, used to implement any of the above-mentioned timing differential correction methods, comprising: Ground time base acquisition module, used to obtain 1PPS+TOD of the ground-based optical fiber timing system as the ground time base; Demodulation module, used to receive time codes of long-wave timing system and short-wave timing system, and demodulate 1PPS+TOD; The time difference measurement module is used to complete the time difference measurement between the long-wave timing system, the short-wave timing system and the ground time base inside the differential correction station, and obtain the long-wave timing time difference T1, the GNSS timing time difference T2, and the communication base station time difference T3; The time difference correction module is used to send the differential correction amount of each time difference to the long-wave timing station and the short-wave timing system to correct the time difference of each system; The real-time correction module is used to perform integrated measurement and real-time correction of each timing system to form a closed-loop feedback system integrating the space and the earth.
[0024] The third aspect of the present invention provides: a computer-readable storage medium, wherein the computer stores computer-executable instructions, and when the computer-executable instructions are loaded and executed by a processor, any of the above-mentioned timing differential correction methods is implemented.
[0025] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.
Claims
1. A timing differential correction method, characterized in that: The following steps are involved: S1: Obtain 1PPS+TOD of the ground-based optical fiber timing system as the ground time base; S2: Receive the time code of the long-wave timing system and the short-wave timing system, and demodulate 1PPS+TOD; S3: Complete the time difference measurement between the long-wave timing system, the short-wave timing system and the ground time base inside the differential correction station to obtain the long-wave timing time difference T1, the GNSS timing time difference T2, and the communication base station time difference T3; S4: Send the differential correction of each time difference to the long-wave timing station and the short-wave timing system to correct the time difference of each system; S5: Conduct integrated measurement and real-time correction of each timing system to form a closed-loop feedback system integrating the sky and the earth.
2. The timing differential correction method according to claim 1, characterized in that: The shortwave timing system includes: GNSS satellite navigation timing system, 4G LTE, and 5G NR terminal timing system.
3. The timing differential correction method according to claim 1, characterized in that: The ground-based optical fiber timing system comprises a UTC time reference source, the UTC time reference source is connected to an optical fiber time and frequency synchronization device, the optical fiber time and frequency synchronization device is connected to a relay device, the relay device is connected to a ground-based optical fiber timing reference station; the ground-based optical fiber timing reference station is connected to a differential correction station, the differential correction station is connected to a communication base station, a long-wave timing system and a short-wave timing system; the communication base station is connected to a long-wave timing system and a long- and short-wave timing system user terminal; the long- and short-wave timing system user terminal is connected to a long-wave timing system and a short-wave timing system; The ground-based optical fiber timing reference station is used to send the ground time base to the differential correction station; when the differential correction station receives the ground time base, it calculates the long-wave and short-wave differential correction values and sends them to the communication base station; the communication base station sends the long-wave and short-wave differential correction values to the long-wave timing system and the long- and short-wave timing system user end for accuracy correction and correction verification.
4. A timing differential correction system, characterized in that: The method for implementing the timing difference correction method according to any one of claims 1 to 3 comprises: Ground time base acquisition module, used to obtain 1PPS+TOD of the ground-based optical fiber timing system as the ground time base; Demodulation module, used to receive time codes of long-wave timing system and short-wave timing system, and demodulate 1PPS+TOD; The time difference measurement module is used to complete the time difference measurement between the long-wave timing system, the short-wave timing system and the ground time base inside the differential correction station, and obtain the long-wave timing time difference T1, the GNSS timing time difference T2, and the communication base station time difference T3; The time difference correction module is used to send the differential correction amount of each time difference to the long-wave timing station and the short-wave timing system to correct the time difference of each system; The real-time correction module is used to perform integrated measurement and real-time correction of each timing system to form a closed-loop feedback system integrating the space and the earth.
5. A computer-readable storage medium, characterized in that: The computer stores computer executable instructions, and when the computer executable instructions are loaded and executed by the processor, the timing differential correction method as described in any one of claims 1 to 3 is implemented.