Dual-machine redundant time synchronization system and method

Abstract

The present invention belongs to the field of time synchronization technology and discloses a dual-machine redundant time synchronization system and method. The dual-machine redundant time synchronization system includes: a first master clock, a second master clock, an extended clock, and a time-served device. The first master clock and the second master clock are both equipped with a Beidou timing unit and a positioning timing unit. Time synchronization is performed using dual clocks equipped with both Beidou timing units and positioning timing units. When an abnormality occurs in the operating state of the first master clock, a first target timing signal is generated based on the second master clock. Through Beidou timing, positioning timing, and dual-machine redundant configuration, the accuracy of the timing source is guaranteed, while the construction cost of the clock system is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of time synchronization, and in particular to a dual-machine redundant time synchronization system and method. Background Art

[0002] Thermal power plants utilize numerous production and control devices, some of which have high requirements for time accuracy and synchronization. Developing reliable and cost-effective timing solutions remains a major research topic for thermal power plant timing systems. Currently, most thermal power plant timing systems rely on a single source, either Beidou or GPS. Failure of one source can severely impact equipment synchronization and the reliable operation of related equipment. Some power plants utilize multiple timing systems, but these systems often exhibit millisecond or microsecond errors, leading to potential drawbacks.

[0003] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0004] The main purpose of the present invention is to provide a dual-machine redundant time synchronization system and method, aiming to solve the technical problem that the reliability of the timing source cannot be guaranteed in the prior art.

[0005] To achieve the above object, the present invention provides a dual-machine redundant timing system, comprising: a first master clock, a second master clock, an extended clock, and a timing device, wherein the first master clock and the second master clock are both equipped with a Beidou timing unit and a positioning timing unit;

[0006] The first master clock is configured to detect a current operating state and, when the current operating state is a fault state, send a time synchronization generation signal to the second master clock;

[0007] The second master clock is configured to determine a first target timing signal according to a first target reference signal upon receiving the timing generation signal, and send the first target timing signal to the first master clock and the extended clock;

[0008] The first master clock is further configured to receive the first target timing signal, generate a second target timing signal according to the first target timing signal, and send the second target timing signal to the extended clock;

[0009] The extended clock is used to receive the first target timing signal and the second target timing signal, and send the first target timing signal and the second target timing signal to the timing device;

[0010] The timed device is configured to perform device timing according to the first target timing signal and the second target timing signal.

[0011] Optionally, the first master clock further includes a timing unit and a protection unit;

[0012] The Beidou timing unit is configured to receive Beidou satellite signals, determine a Beidou timing signal based on the Beidou satellite signals, and send the Beidou timing signal to the protection unit;

[0013] The positioning and timing unit is configured to receive positioning satellite signals, determine positioning and timing signals based on the positioning satellite signals, and send the positioning and timing signals to the protection unit;

[0014] The protection unit is configured to send the Beidou timing signal and the positioning timing signal to the timing unit after receiving the Beidou timing signal and the positioning timing signal;

[0015] The timing unit is used to detect the first operating state of the Beidou timing unit according to the Beidou timing signal and to detect the second operating state of the positioning timing unit according to the positioning timing signal, and when the first operating state and / or the second operating state is a fault state, send a timing generation signal to the second master clock.

[0016] Optionally, the timing unit is also used to obtain a preset timing signal, compare the Beidou timing signal with the positioning timing signal, and when the Beidou timing signal and the positioning timing signal are different, determine that the first operating state and / or the second operating state is a fault state, send a timing generation signal to the second master clock, and compare the Beidou timing signal and the positioning timing signal with the preset timing signal respectively to obtain a comparison result, and determine the fault state in the first operating state and the second operating state according to the comparison result.

[0017] Optionally, the first master clock is further configured to detect a current operating state, and when the current operating state is not a fault state, determine a third target timing signal based on the second target reference signal, and send the third target timing signal to the second master clock and the extended clock;

[0018] The second master clock is further configured to generate a fourth target timing signal according to the third target timing signal when receiving the third target timing signal, and send the fourth target timing signal to the extended clock;

[0019] The extended clock is further configured to receive the third target timing signal and the fourth target timing signal, and send the third target timing signal and the fourth target timing signal to the timing device;

[0020] The timing device is used to synchronize device time according to the third target timing signal and the fourth target timing signal.

[0021] Optionally, the first master clock includes a Beidou timing unit, a positioning timing unit, a timing unit and a protection unit;

[0022] The Beidou timing unit is configured to receive Beidou satellite signals, determine a Beidou timing signal based on the Beidou satellite signals, and send the Beidou timing signal to the protection unit;

[0023] The positioning and timing unit is configured to receive positioning satellite signals, determine positioning and timing signals based on the positioning satellite signals, and send the positioning and timing signals to the protection unit;

[0024] The protection unit is configured to send the Beidou timing signal and the positioning timing signal to the timing unit after receiving the Beidou timing signal and the positioning timing signal;

[0025] The timing unit is used to detect the first operating state of the Beidou timing unit according to the Beidou timing signal and the second operating state of the positioning timing unit according to the positioning timing signal. When the first operating state and the second operating state are not fault states, a third target timing signal is determined according to the Beidou timing signal and the positioning timing signal, and the third target timing signal is sent to the second master clock and the extended clock.

[0026] Furthermore, to achieve the above-mentioned object, the present invention also provides a dual-machine redundant time synchronization method, which is applied to the dual-machine redundant time synchronization system as described above, wherein the dual-machine redundant time synchronization system includes: a first master clock, a second master clock, an extended clock, and a time-served device, wherein the first master clock and the second master clock are both equipped with a Beidou timing unit and a positioning timing unit;

[0027] The dual-machine redundant time synchronization method includes:

[0028] The first master clock detects a current operating state, and when the current operating state is a fault state, sends a time synchronization generation signal to the second master clock;

[0029] When the second master clock receives the timing generation signal, it determines a first target timing signal according to the first target reference signal, and sends the first target timing signal to the first master clock and the extended clock;

[0030] The first master clock receives the first target timing signal, generates a second target timing signal according to the first target timing signal, and sends the second target timing signal to the extended clock;

[0031] The extended clock receives the first target timing signal and the second target timing signal, and sends the first target timing signal and the second target timing signal to the timed device;

[0032] The timing-accredited device performs device timing synchronization according to the first target timing signal and the second target timing signal.

[0033] Optionally, the first master clock further includes a timing unit and a protection unit;

[0034] The first master clock detects a current operating state, and when the current operating state is a fault state, sends a time synchronization generation signal to the second master clock, including:

[0035] The Beidou timing unit receives a Beidou satellite signal, determines a Beidou timing signal according to the Beidou satellite signal, and sends the Beidou timing signal to the protection unit;

[0036] The positioning and timing unit receives a positioning satellite signal, determines a positioning and timing signal according to the positioning satellite signal, and sends the positioning and timing signal to the protection unit;

[0037] After receiving the Beidou timing signal and the positioning timing signal, the protection unit sends the Beidou timing signal and the positioning timing signal to the timing unit;

[0038] The timing unit detects the first operating state of the Beidou timing unit according to the Beidou timing signal and detects the second operating state of the positioning timing unit according to the positioning timing signal, and when the first operating state and / or the second operating state is a fault state, sends a timing generation signal to the second master clock.

[0039] Optionally, the timing unit detects a first operating state of the Beidou timing unit according to the Beidou timing signal and detects a second operating state of the positioning timing unit according to the positioning timing signal, and when the first operating state and / or the second operating state is a fault state, sends a timing generation signal to the second master clock, including:

[0040] The timing unit obtains a preset timing signal, compares the Beidou timing signal with the positioning timing signal, and when the Beidou timing signal and the positioning timing signal are different, determines that the first operating state and / or the second operating state is a fault state, sends a timing generation signal to the second master clock, and compares the Beidou timing signal and the positioning timing signal with the preset timing signal respectively to obtain a comparison result, and determines the fault state in the first operating state and the second operating state according to the comparison result.

[0041] Optionally, the dual-machine redundant time synchronization method further includes:

[0042] The first master clock detects a current operating state, and when the current operating state is not a fault state, determines a third target timing signal according to a second target reference signal, and sends the third target timing signal to the second master clock and the extended clock;

[0043] When the second master clock receives the third target timing signal, it generates a fourth target timing signal according to the third target timing signal, and sends the fourth target timing signal to the extended clock;

[0044] The extended clock receives the third target timing signal and the fourth target timing signal, and sends the third target timing signal and the fourth target timing signal to the timed device;

[0045] The timing-accredited device performs device timing synchronization according to the third target timing signal and the fourth target timing signal.

[0046] Optionally, the first master clock includes a Beidou timing unit, a positioning timing unit, a timing unit and a protection unit;

[0047] The first master clock detects a current operating state, and when the current operating state is not a fault state, determines a third target timing signal according to a second target reference signal, and sends the third target timing signal to the second master clock and the extended clock, including:

[0048] The Beidou timing unit receives a Beidou satellite signal, determines a Beidou timing signal according to the Beidou satellite signal, and sends the Beidou timing signal to the protection unit;

[0049] The positioning and timing unit receives a positioning satellite signal, determines a positioning and timing signal according to the positioning satellite signal, and sends the positioning and timing signal to the protection unit;

[0050] After receiving the Beidou timing signal and the positioning timing signal, the protection unit sends the Beidou timing signal and the positioning timing signal to the timing unit;

[0051] The timing unit detects a first operating state of the Beidou timing unit according to the Beidou timing signal and a second operating state of the positioning timing unit according to the positioning timing signal. When the first operating state and the second operating state are not fault states, the timing unit determines a third target timing signal according to the Beidou timing signal and the positioning timing signal, and sends the third target timing signal to the second master clock and the extended clock.

[0052] In the present invention, the first master clock detects the current operating state, and when the current operating state is a fault state, a timing generation signal is sent to the second master clock; when the second master clock receives the timing generation signal, it determines the first target timing signal based on the first target reference signal, and sends the first target timing signal to the first master clock and the extended clock; the first master clock receives the first target timing signal, generates the second target timing signal based on the first target timing signal, and sends the second target timing signal to the extended clock; the extended clock receives the first target timing signal and the second target timing signal, and sends the first target timing signal and the second target timing signal to the timed device; the timed device performs device timing according to the first target timing signal and the second target timing signal. Time is synchronized by configuring dual clocks, each of which is a Beidou timing unit and a positioning timing unit. When the operating state of the first master clock is abnormal, the first target timing signal is generated according to the second master clock. By configuring Beidou timing, positioning timing, and dual-machine redundancy, the accuracy of the timing source is guaranteed, while saving the construction cost of the clock system. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is a structural block diagram of the first embodiment of the dual-machine redundant time synchronization system of the present invention;

[0054] Figure 2 This is a block diagram of the overall structure of an embodiment of a dual-machine redundant time synchronization system of the present invention;

[0055] Figure 3 This is a structural block diagram of a second embodiment of the dual-machine redundant time synchronization system of the present invention;

[0056] Figure 4 This is a flow chart of a first embodiment of a dual-machine redundant time synchronization method according to the present invention;

[0057] Figure 5 FIG. 2 is a flow chart of a second embodiment of a dual-machine redundant time synchronization method according to the present invention.

[0058] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0059] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0060] Reference Figure 1 , Figure 1 This is a structural block diagram of the first embodiment of the dual-machine redundant time synchronization system of the present invention.

[0061] In this embodiment, the dual-machine redundant timing system includes: a first master clock, a second master clock, an extended clock, and a timed device, wherein the first master clock and the second master clock are both equipped with a Beidou timing unit and a positioning timing unit; the first master clock is used to detect the current operating state, and when the current operating state is a fault state, sends a timing generation signal to the second master clock; the second master clock is used to determine a first target timing signal based on a first target reference signal upon receiving the timing generation signal, and send the first target timing signal to the first master clock and the extended clock; the first master clock is also used to receive the first target timing signal, generate a second target timing signal based on the first target timing signal, and send the second target timing signal to the extended clock; the extended clock is used to receive the first target timing signal and the second target timing signal, and send the first target timing signal and the second target timing signal to the timed device; the timed device is used to perform device timing according to the first target timing signal and the second target timing signal.

[0062] It should be noted that the first master clock 10 is a device for generating and sending a target timing signal, and can also detect the current operating status of the Beidou timing unit and the positioning timing unit in the first master clock 10. When any one or both of the Beidou timing unit and the positioning timing unit are in a fault state, the first master clock 10 generates a timing generation signal and sends the timing generation signal to the second master clock 20. The timing generation signal is a trigger signal for the second master clock 20 to generate a timing source.

[0063] It is understood that the second master clock 20 is a secondary clock with the same functions and modules as the first master clock 10. When the current operating state of the first master clock 10 is a fault state, the second master clock 20 generates the target timing signal based on the timing generation signal sent by the first master clock 10. The first reference signal refers to the Beidou timing signal received by the Beidou timing unit in the second master clock 20 and the positioning timing signal received by the positioning timing unit in the second master clock 20.

[0064] In a specific implementation, the first target timing signal is a precise timing source generated by the second master clock 20 according to the first reference signal, and the first target timing signal is sent to the first master clock 10 and the extended clock 30 .

[0065] It should be noted that after receiving the first target timing signal, the first master clock 10 generates a second target timing signal identical to the first target timing signal according to the first target timing signal, and sends the second target timing signal to the extended clock 30 .

[0066] It can be understood that since the number of output boards of the first master clock 10 and the second master clock 20 is limited and cannot meet the requirements of the time-served device, an extended clock 30 is required. The first master clock 10 and the second master clock 20 are both connected to a corresponding extended clock 30 through an optical fiber. The first master clock 10 corresponds to the first extended clock, and the second master clock 20 corresponds to the second extended clock. The first extended clock receives the second target timing signal sent by the first master clock, and the second extended clock receives the first target timing signal sent by the second master clock. The first extended clock and the second extended clock are respectively connected to the corresponding time-served device 40. The first extended clock forwards the second target timing signal to the time-served device 40 corresponding to the first extended clock, and the second extended clock forwards the first target timing signal to the time-served device 40 corresponding to the second extended clock.

[0067] It should be noted that the time-synchronized devices 40 include but are not limited to relay protection equipment, auxiliary network control systems, smoke purification CEMS systems and unit DCS systems. After the time-synchronized devices 40 receive the first target timing signal and the second target timing signal, each time-synchronized device 40 performs device timing according to the first target timing signal and the second target timing signal.

[0068] It can be understood that in order to ensure the stability of the dual-machine redundant timing system and to ensure the normal operation of the system, the dual-machine redundant timing method further includes: the first master clock detects the current operating status, and when the current operating status is not a fault state, determines the third target timing signal according to the second target reference signal, and sends the third target timing signal to the second master clock and the extended clock; when the second master clock receives the third target timing signal, it generates a fourth target timing signal according to the third target timing signal, and sends the fourth target timing signal to the extended clock; the extended clock receives the third target timing signal and the fourth target timing signal, and sends the third target timing signal and the fourth target timing signal to the timed device; the timed device performs device timing according to the third target timing signal and the fourth target timing signal.

[0069] In a specific implementation, the first master clock 10 detects the current operating status of the Beidou timing unit and the positioning timing unit in the first master clock 10. When neither the Beidou timing unit nor the positioning timing unit is in a faulty state, the third target timing signal is determined based on the second target reference signal. The second reference signal refers to the Beidou timing signal received by the Beidou timing unit in the first master clock 10 and the positioning timing signal received by the positioning timing unit in the first master clock.

[0070] It is understood that the third target timing signal is a precise timing source generated by the first master clock 10 based on the second reference signal, and the third target timing signal is sent to the second master clock 20 and the extended clock 30 .

[0071] In a specific implementation, when the current operating state of the first master clock 10 is not a fault state, the second master clock 20 generates a fourth target timing signal that is identical to the third target timing signal only based on the third target timing signal generated by the first master clock 10, and sends the fourth target timing signal to the extended clock 30.

[0072] It should be noted that, after receiving the third target timing signal sent by the first master clock 10, the first extended clock in the extended clock 30 forwards the third target timing signal to the timing device 40 corresponding to the first extended clock. After receiving the fourth target timing signal sent by the second master clock 20, the second extended clock forwards the fourth target timing signal to the timing device 40 corresponding to the second extended clock. Each timing device 40 performs device timing according to the third target timing signal and the fourth target timing signal.

[0073] It can be understood that in order to obtain an accurate third target timing signal, thereby ensuring that the timing source in the system is more accurate, further, the first master clock includes a Beidou timing unit, a positioning timing unit, a timing unit and a protection unit; the first master clock detects the current operating state, and when the current operating state is not a fault state, determines the third target timing signal according to the second target reference signal, and sends the third target timing signal to the second master clock and the extended clock, including: the Beidou timing unit receives Beidou satellite signals, determines Beidou timing signals according to the Beidou satellite signals, and sends the Beidou timing signals to the protection unit; the positioning timing unit receives positioning satellite signals, and determines the third target timing signal according to the second target reference signal. The positioning satellite signal determines the positioning timing signal, and sends the positioning timing signal to the protection unit; after receiving the Beidou timing signal and the positioning timing signal, the protection unit sends the Beidou timing signal and the positioning timing signal to the timing unit; the timing unit detects the first operating state of the Beidou timing unit according to the Beidou timing signal and the second operating state of the positioning timing unit according to the positioning timing signal, and when the first operating state and the second operating state are not fault states, determines a third target timing signal according to the Beidou timing signal and the positioning timing signal, and sends the third target timing signal to the second master clock and the extended clock.

[0074] In the specific implementation, the first master clock 10 includes a Beidou timing unit, a positioning timing unit, a timing unit and a protection unit. The Beidou timing unit in the first master clock 10 receives the Beidou timing signal through the Beidou reference signal antenna, and the Beidou timing signal is transmitted to the protection unit through a coaxial cable. At the same time, there is no obstruction within 180 degrees around the location of the Beidou timing unit.

[0075] It should be noted that the positioning and timing unit receives the positioning and timing signal through the GPS reference signal antenna, and the positioning and timing signal is transmitted to the protection unit through the coaxial cable. At the same time, there is no obstruction within 180 degrees around the location of the positioning and timing unit.

[0076] It can be understood that the protection unit is used to connect the Beidou timing unit and the timing unit, and is also used to connect the positioning timing unit and the timing unit. Under normal circumstances, the protection unit is installed before the coaxial cable is connected to the timing unit to protect the timing unit and prevent lightning strikes from damaging the timing unit. The protection unit can be a lightning arrester or other protection device that can achieve the above functions. This embodiment does not limit this.

[0077] In a specific implementation, the timing unit includes an internal timing unit that outputs a preset timing signal. The internal timing unit compares the preset timing signal with the Beidou timing signal and the positioning timing signal. When the Beidou timing signal and the positioning timing signal are identical, the first operating state corresponding to the Beidou timing unit and the second operating state corresponding to the positioning timing unit are not faulty. If there is a significant difference between the preset timing signal and the Beidou timing signal and the positioning timing signal, a third target timing signal is determined based on the Beidou timing signal and the positioning timing signal. The timing unit then transmits the third target timing signal to the second master clock 20 and the extended clock 30.

[0078] It should be noted that if Figure 2 As shown, the first master clock 10 and the second master clock 20 are both equipped with a Beidou timing signal antenna and a GPS reference signal antenna for determining the Beidou timing signal and the positioning timing signal. The first master clock 10 and the second master clock 20 are respectively connected to the corresponding extended clock 30 and the timed device 40, and the extended clock 30 is respectively connected to the corresponding timed device 40.

[0079] In this embodiment, the first master clock detects the current operating state. When the current operating state is a fault state, a timing generation signal is sent to the second master clock. When the second master clock receives the timing generation signal, it determines a first target timing signal based on the first target reference signal and sends the first target timing signal to the first master clock and the extended clock. The first master clock receives the first target timing signal, generates a second target timing signal based on the first target timing signal, and sends the second target timing signal to the extended clock. The extended clock receives the first target timing signal and the second target timing signal and sends the first target timing signal and the second target timing signal to the timed device. The timed device performs device timing according to the first target timing signal and the second target timing signal. Time is synchronized by configuring dual clocks, each with a Beidou timing unit and a positioning timing unit. When the operating state of the first master clock is abnormal, the first target timing signal is generated based on the second master clock. By configuring Beidou timing, positioning timing, and dual-machine redundancy, the accuracy of the timing source is guaranteed, while saving the construction cost of the clock system.

[0080] Reference Figure 3 , Figure 3 This is a structural block diagram of a second embodiment of a dual-machine redundant time synchronization system according to the present invention. Based on the above-mentioned first embodiment, the second embodiment of the dual-machine redundant time synchronization system according to the present invention is proposed.

[0081] In this embodiment, the first master clock 10 includes a Beidou timing unit 11, a positioning timing unit 12, a timing unit 13 and a protection unit 14; the Beidou timing unit 11 is used to receive Beidou satellite signals, determine the Beidou timing signal based on the Beidou satellite signals, and send the Beidou timing signal to the protection unit; the positioning timing unit 12 is used to receive positioning satellite signals, determine the positioning timing signal based on the positioning satellite signals, and send the positioning timing signal to the protection unit; the protection unit 13 is used to send the Beidou timing signal and the positioning timing signal to the timing unit after receiving the Beidou timing signal and the positioning timing signal; the timing unit 14 is used to detect the first operating state of the Beidou timing unit according to the Beidou timing signal and the second operating state of the positioning timing unit according to the positioning timing signal, and when the first operating state and / or the second operating state is a fault state, send a timing generation signal to the second master clock.

[0082] It should be noted that the Beidou timing unit 11 in the first master clock 10 receives Beidou satellite signals via a Beidou reference signal antenna, determines a Beidou timing signal generated by the Beidou timing unit 11 based on the received Beidou satellite signals, and transmits the Beidou timing signal to the protection unit 14 via a coaxial cable. Meanwhile, the Beidou timing unit 11 is located in a 180-degree area with no obstructions.

[0083] It is understood that the positioning and timing unit 12 receives positioning satellite signals through the GPS reference signal antenna, determines the positioning and timing signal generated by the positioning and timing unit 12 based on the received positioning satellite signals, and transmits the positioning and timing signal to the protection unit 14 via a coaxial cable. At the same time, there is no obstruction within 180 degrees around the location of the positioning and timing unit 12.

[0084] In a specific implementation, the protection unit 14 is used to connect the Beidou timing unit 11 and the timing unit 13, and is also used to connect the positioning timing unit 12 and the timing unit 13. Under normal circumstances, the protection unit 14 is installed before the coaxial cable accesses the timing unit 13, and is used to protect the timing unit 13 to prevent lightning from damaging the timing unit 13. The protection unit 14 can be a lightning arrester or other protection device that can achieve the above functions, and this embodiment does not limit this.

[0085] It should be noted that after receiving the Beidou timing signal and the positioning timing signal, the protection unit 14 sends the Beidou timing signal and the positioning timing signal to the timing unit 13, so that the timing unit 13 generates a third target timing signal based on the Beidou timing signal and the positioning timing signal.

[0086] It is understood that the timing unit 13 compares the Beidou timing signal and the positioning timing signal. If the Beidou timing signal and the positioning timing signal are different, it indicates that one or both of the first operating state corresponding to the Beidou timing unit 11 and the second operating state corresponding to the positioning timing unit 12 are in a faulty state. At this time, the timing unit 13 of the first master clock 10 sends a timing generation signal to the second master clock 20.

[0087] In a specific implementation, in order to accurately judge the operating status of the Beidou timing unit and the positioning timing unit in the first master clock, thereby ensuring the stable operation of the system, the timing unit further detects the first operating status of the Beidou timing unit according to the Beidou timing signal and detects the second operating status of the positioning timing unit according to the positioning timing signal, and when the first operating status and / or the second operating status is a fault state, sends a timing generation signal to the second master clock, including: the timing unit obtains a preset timing signal, compares the Beidou timing signal with the positioning timing signal, and when the Beidou timing signal and the positioning timing signal are different, determines that the first operating status and / or the second operating status is a fault state, sends a timing generation signal to the second master clock, and compares the Beidou timing signal and the positioning timing signal with the preset timing signal respectively to obtain a comparison result, and determines the fault state in the first operating status and the second operating status according to the comparison result.

[0088] It should be noted that the timing unit 13 includes an internal timing unit that outputs a preset timing signal and compares the Beidou timing signal with the positioning timing signal. If the Beidou timing signal and the positioning timing signal differ, it indicates that one or both of the first operating state corresponding to the Beidou timing unit 11 and the second operating state corresponding to the positioning timing unit 12 are in a fault state. At this time, the timing unit 13 of the first master clock 10 sends a timing generation signal to the second master clock 20.

[0089] It can be understood that when the timing unit 13 determines that there is a fault state in the first operating state corresponding to the Beidou timing unit 11 and the second operating state corresponding to the positioning timing unit 12, the timing unit 13 compares the preset timing signal and the Beidou timing signal to obtain a comparison result of the two, and at the same time compares the preset timing signal and the positioning timing signal to obtain a comparison result of the two. When the preset timing signal and the Beidou timing signal are significantly different, it indicates that the first operating state of the Beidou timing unit 11 is a fault state. When the preset timing signal and the positioning timing signal are significantly different, it indicates that the second operating state of the positioning timing unit 12 is a fault state. When the difference between the preset timing signal and the Beidou timing signal is significantly different from the difference between the positioning timing signal and the preset timing signal, it indicates that the first operating state of the Beidou timing unit 11 and the second operating state of the positioning timing unit 12 are both fault states.

[0090] In this embodiment, the Beidou timing unit receives Beidou satellite signals, determines Beidou timing signals based on the Beidou satellite signals, and sends the Beidou timing signals to the protection unit; the positioning timing unit receives positioning satellite signals, determines positioning timing signals based on the positioning satellite signals, and sends the positioning timing signals to the protection unit; after receiving the Beidou timing signals and the positioning timing signals, the protection unit sends the Beidou timing signals and the positioning timing signals to the timing unit; the timing unit detects the first operating state of the Beidou timing unit based on the Beidou timing signals and the second operating state of the positioning timing unit based on the positioning timing signals, and when the first operating state and / or the second operating state is a fault state, sends a timing generation signal to the second master clock. The Beidou timing signal and the positioning timing signal are obtained respectively through the Beidou timing unit and the positioning timing unit of the first master clock, and the status detection is performed according to the Beidou timing signal and the positioning timing signal through the timing unit. When there is a fault state in the operation state of the Beidou timing unit and the positioning timing unit, the timing generation signal is sent to the second master clock, which not only ensures the accuracy of the status detection, but also improves the accuracy of the target timing signal generation.

[0091] Reference Figure 4 , Figure 4 This is a flow chart of a first embodiment of a dual-machine redundant time synchronization method according to the present invention. The dual-machine redundant time synchronization method is applied to the dual-machine redundant time synchronization system described above. The dual-machine redundant time synchronization system includes: a first master clock, a second master clock, an extended clock, and a time-served device. The first master clock and the second master clock are both equipped with a Beidou timing unit and a positioning timing unit. The dual-machine redundant time synchronization method includes:

[0092] Step S10: The first master clock detects the current operating state, and when the current operating state is a fault state, sends a time synchronization generation signal to the second master clock.

[0093] It should be noted that the executor of this embodiment is a dual-machine redundant timing system, which includes a first master clock, a second master clock, an extended clock and a timing device. Both the first master clock and the second master clock are equipped with a Beidou timing unit and a positioning timing unit.

[0094] It can be understood that the first master clock is a device for generating and sending target timing signals, and can also detect the current operating status of the Beidou timing unit and the positioning timing unit in the first master clock. When any one or both of the Beidou timing unit and the positioning timing unit are in a fault state, the first master clock generates a timing generation signal and sends the timing generation signal to the second master clock. The timing generation signal is a trigger signal for the second master clock to generate a timing source.

[0095] Step S20: When receiving the timing generation signal, the second master clock determines a first target timing signal according to the first target reference signal, and sends the first target timing signal to the first master clock and the extended clock.

[0096] It should be noted that the second master clock has the same functions and modules as the first master clock. When the first master clock is in a faulty state, the second master clock generates the target timing signal based on the timing generation signal sent by the first master clock. The first reference signal refers to the Beidou timing signal received by the Beidou timing unit in the second master clock and the positioning timing signal received by the positioning timing unit in the second master clock.

[0097] It is understood that the first target timing signal is an accurate timing source generated by the second master clock based on the first reference signal, and the first target timing signal is sent to the first master clock and the extended clock.

[0098] Step S30: The first master clock receives the first target timing signal, generates a second target timing signal according to the first target timing signal, and sends the second target timing signal to the extended clock.

[0099] It should be noted that after receiving the first target timing signal, the first master clock generates a second target timing signal identical to the first target timing signal based on the first target timing signal, and sends the second timing signal to the extended clock.

[0100] Step S40: The extended clock receives the first target timing signal and the second target timing signal, and sends the first target timing signal and the second target timing signal to the timing device.

[0101] It should be noted that since the number of output boards of the first master clock and the second master clock is limited and cannot meet the requirements of the time-served device, an extended clock is required. The first master clock and the second master clock are both connected to a corresponding extended clock through optical fiber. The first master clock corresponds to the first extended clock, and the second master clock corresponds to the second extended clock. The first extended clock receives the second target timing signal sent by the first master clock, and the second extended clock receives the first target timing signal sent by the second master clock. The first extended clock and the second extended clock are respectively connected to the corresponding time-served device. The first extended clock forwards the second target timing signal to the time-served device corresponding to the first extended clock, and the second extended clock forwards the first target timing signal to the time-served device corresponding to the second extended clock.

[0102] Step S50: The timing device performs device timing synchronization according to the first target timing signal and the second target timing signal.

[0103] It should be noted that the time-synchronized devices include but are not limited to relay protection equipment, auxiliary network control systems, smoke purification CEMS systems and unit DCS systems. After receiving the first target timing signal and the second target timing signal, each time-synchronized device will synchronize the equipment according to the first target timing signal and the second target timing signal.

[0104] It can be understood that in order to ensure the stability of the dual-machine redundant timing system and to ensure the normal operation of the system, the dual-machine redundant timing method further includes: the first master clock detects the current operating status, and when the current operating status is not a fault state, determines the third target timing signal according to the second target reference signal, and sends the third target timing signal to the second master clock and the extended clock; when the second master clock receives the third target timing signal, it generates a fourth target timing signal according to the third target timing signal, and sends the fourth target timing signal to the extended clock; the extended clock receives the third target timing signal and the fourth target timing signal, and sends the third target timing signal and the fourth target timing signal to the timed device; the timed device performs device timing according to the third target timing signal and the fourth target timing signal.

[0105] In a specific implementation, the first master clock detects the current operating status of the Beidou timing unit and the positioning timing unit in the first master clock. When neither the Beidou timing unit nor the positioning timing unit is in a faulty state, the first master clock determines the third target timing signal based on the second target reference signal. The second reference signal refers to the Beidou timing signal received by the Beidou timing unit in the first master clock and the positioning timing signal received by the positioning timing unit in the first master clock.

[0106] It is understood that the third target timing signal is a precise timing source generated by the first master clock based on the second reference signal, and the third target timing signal is sent to the second master clock and the extended clock.

[0107] In a specific implementation, when the current operating state of the first master clock is not a fault state, the second master clock generates a fourth target timing signal that is identical to the third target timing signal only based on the third target timing signal generated by the first master clock, and sends the fourth target timing signal to the extended clock.

[0108] It should be noted that after the first extended clock in the extended clock receives the third target timing signal sent by the first master clock, it forwards the third target timing signal to the timing device corresponding to the first extended clock. After the second extended clock receives the fourth target timing signal sent by the second master clock, it forwards the fourth target timing signal to the timing device corresponding to the second extended clock. Each timing device performs device synchronization according to the third target timing signal and the fourth target timing signal.

[0109] It can be understood that in order to obtain an accurate third target timing signal, thereby ensuring that the timing source in the system is more accurate, further, the first master clock includes a Beidou timing unit, a positioning timing unit, a timing unit and a protection unit; the first master clock detects the current operating state, and when the current operating state is not a fault state, determines the third target timing signal according to the second target reference signal, and sends the third target timing signal to the second master clock and the extended clock, including: the Beidou timing unit receives Beidou satellite signals, determines Beidou timing signals according to the Beidou satellite signals, and sends the Beidou timing signals to the protection unit; the positioning timing unit receives positioning satellite signals, and determines the third target timing signal according to the second target reference signal. The positioning satellite signal determines the positioning timing signal, and sends the positioning timing signal to the protection unit; after receiving the Beidou timing signal and the positioning timing signal, the protection unit sends the Beidou timing signal and the positioning timing signal to the timing unit; the timing unit detects the first operating state of the Beidou timing unit according to the Beidou timing signal and the second operating state of the positioning timing unit according to the positioning timing signal, and when the first operating state and the second operating state are not fault states, determines a third target timing signal according to the Beidou timing signal and the positioning timing signal, and sends the third target timing signal to the second master clock and the extended clock.

[0110] In the specific implementation, the first master clock includes a Beidou timing unit, a positioning timing unit, a timing unit and a protection unit. The Beidou timing unit in the first master clock receives the Beidou timing signal through the Beidou reference signal antenna, and the Beidou timing signal is transmitted to the protection unit through a coaxial cable. At the same time, there is no obstruction within 180 degrees around the location of the Beidou timing unit.

[0111] It should be noted that the positioning and timing unit receives the positioning and timing signal through the GPS reference signal antenna, and the positioning and timing signal is transmitted to the protection unit through the coaxial cable. At the same time, there is no obstruction within 180 degrees around the location of the positioning and timing unit.

[0112] It can be understood that the protection unit is used to connect the Beidou timing unit and the timing unit, and is also used to connect the positioning timing unit and the timing unit. Under normal circumstances, the protection unit is installed before the coaxial cable is connected to the timing unit to protect the timing unit and prevent lightning strikes from damaging the timing unit. The protection unit can be a lightning arrester or other protection device that can achieve the above functions. This embodiment does not limit this.

[0113] In a specific implementation, the timing unit includes an internal timing unit that outputs a preset timing signal. The internal timing unit compares the preset timing signal with the Beidou timing signal and the positioning timing signal. When the Beidou timing signal and the positioning timing signal are identical, it indicates that the first operating state corresponding to the Beidou timing unit and the second operating state corresponding to the positioning timing unit are not faulty. If there is a significant difference between the preset timing signal and the Beidou timing signal and the positioning timing signal, a third target timing signal is determined based on the Beidou timing signal and the positioning timing signal. The timing unit then sends the third target timing signal to the second master clock and the extended clock.

[0114] In this embodiment, the first master clock detects the current operating state. When the current operating state is a fault state, a timing generation signal is sent to the second master clock. When the second master clock receives the timing generation signal, it determines a first target timing signal based on the first target reference signal and sends the first target timing signal to the first master clock and the extended clock. The first master clock receives the first target timing signal, generates a second target timing signal based on the first target timing signal, and sends the second target timing signal to the extended clock. The extended clock receives the first target timing signal and the second target timing signal and sends the first target timing signal and the second target timing signal to the timed device. The timed device performs device timing according to the first target timing signal and the second target timing signal. Time is synchronized by configuring dual clocks, each with a Beidou timing unit and a positioning timing unit. When the operating state of the first master clock is abnormal, the first target timing signal is generated based on the second master clock. By configuring Beidou timing, positioning timing, and dual-machine redundancy, the accuracy of the timing source is guaranteed, while saving the construction cost of the clock system.

[0115] Figure 5 1 is a flow chart of a second embodiment of a dual-machine redundant time synchronization method according to the present invention. Based on the above-mentioned first embodiment, the second embodiment of the dual-machine redundant time synchronization method according to the present invention is proposed.

[0116] In this embodiment, step S10 includes:

[0117] Step S11: the Beidou timing unit receives Beidou satellite signals, determines Beidou timing signals according to the Beidou satellite signals, and sends the Beidou timing signals to the protection unit.

[0118] It should be noted that the Beidou timing unit in the first master clock receives Beidou satellite signals through the Beidou reference signal antenna, determines the Beidou timing signal generated by the Beidou timing unit based on the received Beidou satellite signals, and transmits the Beidou timing signal to the protection unit via a coaxial cable. The Beidou timing unit is located in a 180-degree clear area.

[0119] Step S12: The positioning and timing unit receives a positioning satellite signal, determines a positioning and timing signal according to the positioning satellite signal, and sends the positioning and timing signal to the protection unit.

[0120] It should be noted that the positioning and timing unit receives positioning satellite signals through the GPS reference signal antenna, determines the positioning and timing signal generated by the positioning and timing unit based on the received positioning satellite signals, and transmits the positioning and timing signal to the protection unit via a coaxial cable. At the same time, there must be no obstructions within a 180-degree radius around the positioning and timing unit.

[0121] Step S13: After receiving the Beidou timing signal and the positioning timing signal, the protection unit sends the Beidou timing signal and the positioning timing signal to the timing unit.

[0122] It should be noted that the protection unit is used to connect the Beidou timing unit and the timing unit, and is also used to connect the positioning timing unit and the timing unit. Under normal circumstances, the protection unit is installed before the coaxial cable is connected to the timing unit to protect the timing unit and prevent lightning strikes from damaging the timing unit. The protection unit can be a lightning arrester or other protection device that can achieve the above functions. This embodiment does not limit this.

[0123] It can be understood that after receiving the Beidou timing signal and the positioning timing signal, the protection unit sends the Beidou timing signal and the positioning timing signal to the timing unit, so that the timing unit generates a third target timing signal based on the Beidou timing signal and the positioning timing signal.

[0124] Step S14: The timing unit detects the first operating state of the Beidou timing unit according to the Beidou timing signal and detects the second operating state of the positioning timing unit according to the positioning timing signal. When the first operating state and / or the second operating state is a fault state, a timing generation signal is sent to the second master clock.

[0125] It should be noted that the timing unit compares the Beidou timing signal and the positioning timing signal. If the Beidou timing signal and the positioning timing signal are different, it indicates that one or both of the first operating state of the Beidou timing unit and the second operating state of the positioning timing unit are in a faulty state. At this time, the timing unit of the first master clock sends a timing generation signal to the second master clock.

[0126] It can be understood that in order to accurately judge the operating status of the Beidou timing unit and the positioning timing unit in the first master clock, thereby ensuring the stable operation of the system, further, the timing unit detects the first operating status of the Beidou timing unit according to the Beidou timing signal and detects the second operating status of the positioning timing unit according to the positioning timing signal, and when the first operating status and / or the second operating status is a fault state, sends a timing generation signal to the second master clock, including: the timing unit obtains a preset timing signal, compares the Beidou timing signal with the positioning timing signal, and when the Beidou timing signal and the positioning timing signal are different, determines that the first operating status and / or the second operating status is a fault state, sends a timing generation signal to the second master clock, and compares the Beidou timing signal and the positioning timing signal with the preset timing signal respectively to obtain a comparison result, and determines the fault state in the first operating status and the second operating status according to the comparison result.

[0127] In a specific implementation, the timing unit contains an internal timing unit that outputs a preset timing signal and compares the Beidou timing signal with the positioning timing signal. If the Beidou timing signal and the positioning timing signal differ, it indicates that one or both of the first operating state corresponding to the Beidou timing unit and the second operating state corresponding to the positioning timing unit are in a faulty state. At this time, the timing unit of the first master clock sends a timing generation signal to the second master clock.

[0128] It can be understood that when the timing unit determines that there is a fault state in the first operating state corresponding to the Beidou timing unit and the second operating state corresponding to the positioning timing unit, the timing unit will compare the preset timing signal and the Beidou timing signal to obtain the comparison result of the two, and at the same time compare the preset timing signal and the positioning timing signal to obtain the comparison result of the two. When the preset timing signal and the Beidou timing signal are significantly different, it means that the first operating state of the Beidou timing unit is a fault state. When the preset timing signal and the positioning timing signal are significantly different, it means that the second operating state of the positioning timing unit is a fault state. When the difference between the preset timing signal and the Beidou timing signal is significantly different from the difference between the positioning timing signal and the preset timing signal, it means that the first operating state of the Beidou timing unit and the second operating state of the positioning timing unit are both fault states.

[0129] In this embodiment, the Beidou timing unit receives Beidou satellite signals, determines Beidou timing signals based on the Beidou satellite signals, and sends the Beidou timing signals to the protection unit; the positioning timing unit receives positioning satellite signals, determines positioning timing signals based on the positioning satellite signals, and sends the positioning timing signals to the protection unit; after receiving the Beidou timing signals and the positioning timing signals, the protection unit sends the Beidou timing signals and the positioning timing signals to the timing unit; the timing unit detects the first operating state of the Beidou timing unit based on the Beidou timing signals and the second operating state of the positioning timing unit based on the positioning timing signals, and when the first operating state and / or the second operating state is a fault state, sends a timing generation signal to the second master clock. The Beidou timing signal and the positioning timing signal are obtained respectively through the Beidou timing unit and the positioning timing unit of the first master clock, and the status detection is performed according to the Beidou timing signal and the positioning timing signal through the timing unit. When there is a fault state in the operation state of the Beidou timing unit and the positioning timing unit, the timing generation signal is sent to the second master clock, which not only ensures the accuracy of the status detection, but also improves the accuracy of the target timing signal generation.

[0130] In addition, it should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0131] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0132] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, or of course by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as a read-only memory (ROM) / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0133] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A dual-machine redundant timing system, characterized in that: The dual-machine redundant timing system includes: a first master clock, a second master clock, an extended clock and a time-served device, wherein the first master clock and the second master clock are both equipped with a Beidou timing unit and a positioning timing unit; The first master clock is configured to detect a current operating state and, when the current operating state is a fault state, send a time synchronization generation signal to the second master clock; The second master clock is configured to determine a first target timing signal according to a first target reference signal upon receiving the timing generation signal, and send the first target timing signal to the first master clock and the extended clock; The first master clock is further configured to receive the first target timing signal, generate a second target timing signal according to the first target timing signal, and send the second target timing signal to the extended clock; The extended clock is used to receive the first target timing signal and the second target timing signal, and send the first target timing signal and the second target timing signal to the timing device; The timing device is configured to perform device timing according to the first target timing signal and the second target timing signal; Wherein, the first master clock further includes a timing unit and a protection unit; The Beidou timing unit is configured to receive Beidou satellite signals, determine a Beidou timing signal based on the Beidou satellite signals, and send the Beidou timing signal to the protection unit; The positioning and timing unit is configured to receive positioning satellite signals, determine positioning and timing signals based on the positioning satellite signals, and send the positioning and timing signals to the protection unit; The protection unit is configured to send the Beidou timing signal and the positioning timing signal to the timing unit after receiving the Beidou timing signal and the positioning timing signal; The timing unit is configured to detect a first operating state of the Beidou timing unit according to the Beidou timing signal and a second operating state of the positioning timing unit according to the positioning timing signal, and send a timing generation signal to the second master clock when the first operating state and / or the second operating state is a fault state; In which, the timing unit is also used to obtain a preset timing signal, compare the Beidou timing signal with the positioning timing signal, and when the Beidou timing signal and the positioning timing signal are different, determine that the first operating state and / or the second operating state is a fault state, send a timing generation signal to the second master clock, and compare the Beidou timing signal and the positioning timing signal with the preset timing signal respectively to obtain a comparison result, and determine the fault state in the first operating state and the second operating state according to the comparison result.

2. The dual-machine redundant timing system according to claim 1, wherein: The first master clock is further configured to detect a current operating state, and when the current operating state is not a fault state, determine a third target timing signal based on the second target reference signal, and send the third target timing signal to the second master clock and the extended clock; The second master clock is further configured to generate a fourth target timing signal according to the third target timing signal when receiving the third target timing signal, and send the fourth target timing signal to the extended clock; The extended clock is further configured to receive the third target timing signal and the fourth target timing signal, and send the third target timing signal and the fourth target timing signal to the timing device; The timing device is used to synchronize device time according to the third target timing signal and the fourth target timing signal.

3. The dual-machine redundant timing system according to claim 2, wherein: The first master clock includes a Beidou timing unit, a positioning timing unit, a timing unit and a protection unit; The Beidou timing unit is configured to receive Beidou satellite signals, determine a Beidou timing signal based on the Beidou satellite signals, and send the Beidou timing signal to the protection unit; The positioning and timing unit is configured to receive positioning satellite signals, determine positioning and timing signals based on the positioning satellite signals, and send the positioning and timing signals to the protection unit; The protection unit is configured to send the Beidou timing signal and the positioning timing signal to the timing unit after receiving the Beidou timing signal and the positioning timing signal; The timing unit is used to detect the first operating state of the Beidou timing unit according to the Beidou timing signal and the second operating state of the positioning timing unit according to the positioning timing signal. When the first operating state and the second operating state are not fault states, a third target timing signal is determined according to the Beidou timing signal and the positioning timing signal, and the third target timing signal is sent to the second master clock and the extended clock.

4. A dual-machine redundant time synchronization method, characterized in that: The dual-machine redundant time synchronization method is applied to the dual-machine redundant time synchronization system according to any one of claims 1 to 3, wherein the dual-machine redundant time synchronization system comprises: a first master clock, a second master clock, an extended clock, and a time-served device, wherein the first master clock and the second master clock are both configured with a Beidou time synchronization unit and a positioning time synchronization unit; The dual-machine redundant time synchronization method includes: The first master clock detects a current operating state, and when the current operating state is a fault state, sends a time synchronization generation signal to the second master clock; When the second master clock receives the timing generation signal, it determines a first target timing signal according to the first target reference signal, and sends the first target timing signal to the first master clock and the extended clock; The first master clock receives the first target timing signal, generates a second target timing signal according to the first target timing signal, and sends the second target timing signal to the extended clock; The extended clock receives the first target timing signal and the second target timing signal, and sends the first target timing signal and the second target timing signal to the timed device; The timing device synchronizes the device time according to the first target timing signal and the second target timing signal; Wherein, the first master clock further includes a timing unit and a protection unit; The first master clock detects a current operating state, and when the current operating state is a fault state, sends a time synchronization generation signal to the second master clock, including: The Beidou timing unit receives a Beidou satellite signal, determines a Beidou timing signal according to the Beidou satellite signal, and sends the Beidou timing signal to the protection unit; The positioning and timing unit receives a positioning satellite signal, determines a positioning and timing signal according to the positioning satellite signal, and sends the positioning and timing signal to the protection unit; After receiving the Beidou timing signal and the positioning timing signal, the protection unit sends the Beidou timing signal and the positioning timing signal to the timing unit; The timing unit detects a first operating state of the Beidou timing unit according to the Beidou timing signal and detects a second operating state of the positioning timing unit according to the positioning timing signal, and sends a timing generation signal to the second master clock when the first operating state and / or the second operating state is a fault state; The timing unit detects a first operating state of the Beidou timing unit according to the Beidou timing signal and detects a second operating state of the positioning timing unit according to the positioning timing signal, and when the first operating state and / or the second operating state is a fault state, sends a timing generation signal to the second master clock, including: The timing unit obtains a preset timing signal, compares the Beidou timing signal with the positioning timing signal, and when the Beidou timing signal and the positioning timing signal are different, determines that the first operating state and / or the second operating state is a fault state, sends a timing generation signal to the second master clock, and compares the Beidou timing signal and the positioning timing signal with the preset timing signal respectively to obtain a comparison result, and determines the fault state in the first operating state and the second operating state according to the comparison result.

5. The dual-machine redundant time synchronization method according to claim 4, wherein: The dual-machine redundant time synchronization method further includes: The first master clock detects a current operating state, and when the current operating state is not a fault state, determines a third target timing signal according to a second target reference signal, and sends the third target timing signal to the second master clock and the extended clock; When the second master clock receives the third target timing signal, it generates a fourth target timing signal according to the third target timing signal, and sends the fourth target timing signal to the extended clock; The extended clock receives the third target timing signal and the fourth target timing signal, and sends the third target timing signal and the fourth target timing signal to the timed device; The timing-accredited device performs device timing synchronization according to the third target timing signal and the fourth target timing signal.

6. The dual-machine redundant time synchronization method according to claim 5, wherein: The first master clock includes a Beidou timing unit, a positioning timing unit, a timing unit and a protection unit; The first master clock detects a current operating state, and when the current operating state is not a fault state, determines a third target timing signal according to a second target reference signal, and sends the third target timing signal to the second master clock and the extended clock, including: The Beidou timing unit receives a Beidou satellite signal, determines a Beidou timing signal according to the Beidou satellite signal, and sends the Beidou timing signal to the protection unit; The positioning and timing unit receives a positioning satellite signal, determines a positioning and timing signal according to the positioning satellite signal, and sends the positioning and timing signal to the protection unit; After receiving the Beidou timing signal and the positioning timing signal, the protection unit sends the Beidou timing signal and the positioning timing signal to the timing unit; The timing unit detects a first operating state of the Beidou timing unit according to the Beidou timing signal and a second operating state of the positioning timing unit according to the positioning timing signal. When the first operating state and the second operating state are not fault states, the timing unit determines a third target timing signal according to the Beidou timing signal and the positioning timing signal, and sends the third target timing signal to the second master clock and the extended clock.

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