Apparatus and method for obtaining a distance-time synchronization error

Abstract

The application discloses a kind of acquisition devices of long-distance time synchronization error, including first time source end equipment and first time terminal equipment, and first time source end equipment and first time terminal equipment are connected by first optical fiber;It further includes second time source end equipment, second time terminal equipment and time analyzer;Second time source end equipment is set at first time terminal equipment, and second time source end equipment and second time terminal equipment are connected by second optical fiber;Time analyzer is connected to second time terminal equipment and first time source end equipment respectively.The acquisition method of the above acquisition device is generated.The application measures synchronization error by parallelly setting two optical fiber time service paths, and introduces high-precision time analyzer, and obtains actual single-path time synchronization error by calculation, is ingeniously designed, utilizes the high-precision characteristics of instrument, guarantees the precision of time synchronization error measurement to improve, so that the scene applicability of acquisition error is stronger, more reliable.

Description

Technical Field

[0001] This invention relates to the field of time and frequency testing technology, and in particular to a device and method for acquiring long-distance time synchronization error. Background Technology

[0002] Time synchronization in network communication refers to time service. In established communication practices, time synchronization relies on the time service function of the Global Navigation Satellite System (GNSS). However, this system suffers from drawbacks: unstable satellite signals are susceptible to interference, and there is a risk of satellite system malfunction and failure. Furthermore, the time service accuracy of existing satellite navigation systems is only 100–200 ns, which cannot meet the requirements of high-precision time service scenarios.

[0003] To address these shortcomings, fiber optic time synchronization (Fiber Optic) and microwave time synchronization technologies have been developed to compensate for them. However, these technologies also have their limitations. For instance, in real-world scenarios, the most common fiber optic and microwave time synchronization methods suffer from synchronization errors that cannot be directly measured due to the large distance between the source and terminal. To measure these errors, the "transported atomic clock method" has been proposed. However, this method is ineffective because vibration and temperature changes during transport affect the atomic clock. Related long-distance time and frequency equipment testing methods use IEEE 1588v2 for coarse synchronization, measuring the phase deviation between the reference frequency signal and the optically recovered frequency signal using a dual-frequency digital module to improve synchronization accuracy. However, this method remains a self-monitoring approach and cannot be used to measure the time synchronization effect with standard instruments, thus having its limitations. Summary of the Invention

[0004] In view of the above-mentioned deficiencies, one of the objectives of the present invention is a device for acquiring long-distance time synchronization error, comprising a first time synchronization source device and a first time synchronization terminal device, which are connected by a first optical fiber; it also comprises a second time synchronization source device, a second time synchronization terminal device, and a time analyzer; the second time synchronization source device is disposed at the first time synchronization terminal device, and the second time synchronization terminal device is disposed at the first time synchronization source device; the second time synchronization source device and the second time synchronization terminal device are connected by a second optical fiber, and the first time synchronization terminal device and the second time synchronization source device are connected by a signal wire; the time analyzer is connected to the second time synchronization terminal device and the first time synchronization source device respectively; the instrument errors of the first time synchronization source device and the second time synchronization source device are the same, the instrument errors of the first time synchronization terminal device and the second time synchronization terminal device are the same, and the instrument errors of the first optical fiber and the second optical fiber are the same.

[0005] In some preferred embodiments, the time analyzer is a high-speed oscilloscope or an SR620 general-purpose time interval frequency counter.

[0006] A second objective of this invention is to provide a method for obtaining long-distance time synchronization errors, employing the aforementioned acquisition device and comprising:

[0007] The first time synchronization source device sends a time signal to the first time synchronization terminal device through the first optical fiber. The time synchronization error between the first time synchronization source device and the first time synchronization terminal device is recorded as △A.

[0008] The second time synchronization source device sends a time signal to the second time synchronization terminal device through the second optical fiber. The time synchronization error between the second time synchronization source device and the second time synchronization terminal device is recorded as △B.

[0009] Measure or calculate the time delay ΔC between the first timing terminal device and the second timing source device;

[0010] The time synchronization error ΔD between the first time synchronization source device and the second time synchronization terminal device is measured using a time analyzer.

[0011] The time synchronization error between the first time synchronization source device and the first time synchronization terminal device is calculated using the formula △A=△B=△D / 2-△C / 2.

[0012] In some preferred embodiments, a high-speed oscilloscope or an SR620 universal time interval frequency counter is used as the time analyzer to measure the time synchronization error ΔD between the first time synchronization source device and the second time synchronization terminal device.

[0013] Beneficial effects: This invention sets up two fiber optic time synchronization paths in parallel and introduces a high-precision time analyzer to measure synchronization error. The actual single-channel time synchronization error is obtained through calculation. The design is ingenious and utilizes the high-precision characteristics of the instrument to ensure improved accuracy of time synchronization error measurement. This makes the obtained error value more applicable to various scenarios and more reliable. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the device configuration of the present invention.

[0016] Figure 2 This is a logic block diagram of the method of the present invention.

[0017] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0020] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0021] refer to Figure 1 As shown, a device for acquiring long-distance time synchronization error includes a first time synchronization source device 101, a first time synchronization terminal device 102, a first optical fiber 103, a second time synchronization source device 104, a second time synchronization terminal device 105, a second optical fiber 106, a time analyzer 107, and a signal cable 108.

[0022] The first timing source device 101 and the first timing terminal device 102 are connected by the first optical fiber 103.

[0023] The second timing source device 104 is located at the first timing terminal device 102, and the second timing terminal device 105 is located at the first timing source device 101. The second timing source device 104 and the second timing terminal device 105 are connected via a second optical fiber 106. The first timing terminal device 102 and the second timing source device 104 are connected via a signal cable 108.

[0024] The time analyzer 107 is connected to the second time synchronization terminal device 105 and the first time synchronization source device 101, respectively.

[0025] The first timing source device 101 and the second timing source device 104 have the same instrument error; the first timing terminal device 102 and the second timing terminal device 105 have the same instrument error; and the first optical fiber 103 and the second optical fiber 106 have the same instrument error.

[0026] In practical implementation, the positions of the first time synchronization source device 101 and the first time synchronization terminal device 102, connected by the first optical fiber 103, form a long-distance time synchronization verification communication link. Similarly, the second time synchronization source device 104 and the second time synchronization terminal device 102 form another long-distance time synchronization verification communication link. In specific operation, the first time synchronization source device 101 and the second time synchronization terminal device 105 are placed in the same equipment room and are close to each other; the first time synchronization terminal device 102 and the second time synchronization source device 104 are placed in the same equipment room and are close to each other. Meanwhile, the first optical fiber 103 and the second optical fiber 106 are made of the same material and have the same performance. This ensures that the time synchronization error of the two communication links used for long-distance time synchronization verification is the same.

[0027] The first timing terminal device 102 and the second timing source device 104 are connected by a signal wire 108. The signal delay between the two can be measured by an instrument and calculated based on the material characteristics of the signal wire.

[0028] In some preferred embodiments, the time analyzer is a high-speed oscilloscope or an SR620 general-purpose time interval frequency counter to ensure high-precision time measurement, down to the 100 picosecond level.

[0029] refer to Figure 2 As shown, a method for acquiring long-distance time synchronization error using the above acquisition device specifically includes:

[0030] The first time synchronization source device sends a time signal to the first time synchronization terminal device through the first optical fiber. The time synchronization error between the first time synchronization source device and the first time synchronization terminal device is recorded as △A.

[0031] The second time synchronization source device sends a time signal to the second time synchronization terminal device through the second optical fiber. The time synchronization error between the second time synchronization source device and the second time synchronization terminal device is recorded as △B.

[0032] Measure or calculate the time delay ΔC between the first timing terminal device and the second timing source device;

[0033] The time synchronization error ΔD between the first time synchronization source device and the second time synchronization terminal device is measured using a time analyzer.

[0034] The time synchronization error between the first time synchronization source device and the first time synchronization terminal device is calculated using the formula △A=△B=△D / 2-△C / 2.

[0035] Furthermore, in some preferred embodiments, a high-speed oscilloscope or an SR620 universal time interval frequency counter is used as the time analyzer to measure the time synchronization error ΔD between the first time synchronization source device and the second time synchronization terminal device.

[0036] Regarding the delay caused by signal conductors, taking copper conductors as an example, the speed of electromagnetic waves in typical pure copper is 2 / 3 the speed of light in a vacuum. If the conductor length is L, the time delay ΔC between the first timing terminal device and the second timing source device can be calculated using the formula ΔT = L / Ccu. Here, Ccu is the propagation speed of electromagnetic waves in the copper conductor, and L is the length of the conductor. If the properties of the conductor medium are unclear, the propagation delay can be directly measured using an instrument, or it can be measured at a mass or metrology unit.

[0037] The above method verifies the time synchronization between two locations over a long distance by obtaining the time synchronization error.

[0038] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A device for acquiring long-distance time synchronization error, comprising a first time synchronization source device and a first time synchronization terminal device, wherein the first time synchronization source device and the first time synchronization terminal device are connected via a first optical fiber; characterized in that: It also includes a second time synchronization source device, a second time synchronization terminal device, and a time analyzer; The second timing source device is located at the first timing terminal device, the second timing terminal device is located at the first timing source device, the second timing source device and the second timing terminal device are connected by a second optical fiber, and the first timing terminal device and the second timing source device are connected by a signal wire. The time analyzer is connected to the second time synchronization terminal device and the first time synchronization source device, respectively. The first and second timing source devices have the same instrument error, the first and second timing terminal devices have the same instrument error, and the first and second optical fibers have the same time synchronization error.

2. The device for acquiring long-distance time synchronization error as described in claim 1, characterized in that: The time analyzer is a high-speed oscilloscope or an SR620 general-purpose time interval frequency counter.

3. A method for obtaining long-distance time synchronization error, characterized in that... The acquisition device as described in any one of claims 1-2 is employed, and includes: The first time synchronization source device sends a time signal to the first time synchronization terminal device through the first optical fiber. The time synchronization error between the first time synchronization source device and the first time synchronization terminal device is recorded as △A. The second time synchronization source device sends a time signal to the second time synchronization terminal device through the second optical fiber. The time synchronization error between the second time synchronization source device and the second time synchronization terminal device is recorded as △B. Measure or calculate the time delay ΔC between the first timing terminal device and the second timing source device; The time synchronization error ΔD between the first time synchronization source device and the second time synchronization terminal device is measured using a time analyzer. The time synchronization error between the first time synchronization source device and the first time synchronization terminal device is calculated using the formula △A=△B=△D / 2-△C / 2.

4. The method for obtaining long-distance time synchronization error as described in claim 3, characterized in that: A high-speed oscilloscope or an SR620 universal time interval frequency counter is used as the time analyzer to measure the time synchronization error ΔD between the first time synchronization source device and the second time synchronization terminal device.

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