Time reference cross-domain transfer apparatus and cross-domain transfer method thereof

Abstract

The present application relates to time synchronization transmission technical field, especially time reference cross-domain transmission device and cross-domain transmission method thereof, including water surface receiving module, underwater receiving module, atomic clock group, power module, control circuit and suspension module; the power module, control circuit and water surface receiving module, underwater receiving module, atomic clock group, suspension module are connected; water surface receiving module and underwater receiving module are used to receive the time reference signal of water surface and underwater transmission, and complete the solution of time reference signal; the power module supplies energy for the device; the control circuit is used for controlling the device work; the suspension module is used for controlling the floating and diving depth of the device in water.The present application guarantees the high reliable stability of itself through the time keeping of multiple atomic clocks; through dynamic tracing, the influence of abnormal external signal on time reference signal is reduced, the robustness and accuracy of the system are improved, the cross-domain high-precision transmission of time reference is completed, and the time synchronization demand of underwater unit is met.

Description

Technical Field

[0001] This invention relates to the field of time synchronization and transmission technology, and in particular to a time reference cross-domain transmission device and method. Background Technology

[0002] With the continuous development of marine industries such as marine resource exploration and deep-sea search and rescue, the demand for intelligent and unmanned underwater vehicles is constantly increasing. Intelligent and unmanned underwater vehicles can reduce the difficulty of underwater operations and improve the accuracy and reliability of various underwater tasks. A high-precision time reference is one of the fundamental prerequisites for the efficient and normal operation of intelligent and unmanned underwater vehicles, and it is an unavoidable technical challenge. Current technologies lack time reference infrastructure for marine areas. Due to the rapid attenuation of electromagnetic wave signals in seawater, the underwater time synchronization accuracy is far lower than that on land. Existing technologies struggle to achieve cross-medium time reference transmission between land, space, sky, and ocean. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in related technologies. To this end, this invention provides a time reference cross-domain transmission device and method, which ensures its high reliability and stability through multi-atomic clock joint timekeeping; and reduces the impact of abnormal external signals on the time reference signal through dynamic tracing, thereby improving the robustness and accuracy of the system, completing the cross-domain high-precision transmission of the time reference, and meeting the time synchronization requirements of underwater units.

[0004] This invention provides a time reference inter-domain transfer device, comprising: a surface receiving and transmitting module, an underwater receiving and transmitting module, an atomic clock group, a power supply module, a control circuit, and a levitation module.

[0005] The power module is connected to the surface transmitter module, the underwater transmitter module, the atomic clock group, and the levitation module;

[0006] The control circuit is connected to the surface receiving module, the underwater receiving module, the atomic clock group, and the levitation module;

[0007] The water surface transceiver module is used to receive and transmit time reference signals above the water surface.

[0008] The underwater transceiver module is used to receive and transmit time reference signals below the water surface, and simultaneously perform time reference signal calculation.

[0009] The power module is used to supply power to the surface transceiver module, the underwater transceiver module, the atomic clock group, and the levitation module;

[0010] The control circuit includes a control algorithm for controlling the operation of the surface transmitter module, the underwater transmitter module, the atomic clock group, the power supply module, and the levitation module.

[0011] The levitation module is used to control the device's buoyancy and diving depth in water.

[0012] According to the present invention, a time reference cross-domain transmission device is provided, wherein the water surface transceiver module includes a retractable integrated antenna, a satellite navigation receiver, and a radio receiver;

[0013] The retractable integrated antenna is connected to the satellite navigation receiver;

[0014] The retractable integrated antenna is connected to the radio receiver;

[0015] The retractable integrated antenna is used to receive time reference signals and convert the signals into satellite radio frequency signals processed by the satellite navigation receiver and radio station radio frequency signals processed by the radio receiver.

[0016] The satellite navigation receiver is used to process satellite radio frequency signals and complete the calculation of satellite time reference signals;

[0017] The radio receiver is used to process radio frequency signals from the radio station and to perform the calculation of the radio station time reference signal.

[0018] According to the present invention, a time reference cross-domain transmission device is provided, wherein the underwater transceiver module includes an acoustic transceiver and a laser transceiver:

[0019] The underwater acoustic receiver and control circuit are connected;

[0020] The laser receiving and transmitting device is connected to the control circuit;

[0021] The underwater acoustic transceiver is used to receive and transmit underwater acoustic time reference signals, and at the same time to perform the calculation of the time reference signals;

[0022] The laser receiving and transmitting device is used to receive and transmit laser time reference signals, and simultaneously perform time reference signal calculation.

[0023] According to the present invention, a time reference inter-domain transfer device has two states: floating on the water surface and submerged in water.

[0024] When the device is floating on the water surface, it receives satellite and radio time reference signals from the water surface, as well as underwater acoustic time reference signals and laser time reference signals from underwater.

[0025] When the device is in a submerged state, it receives underwater acoustic and laser time reference signals and periodically rises to receive satellite signals to calibrate deviations.

[0026] According to the present invention, a time reference cross-domain transfer device has two operating modes: external synchronization mode and self-timekeeping mode.

[0027] When this device is in external synchronization mode, it is used to receive external time reference signals and tame the local atomic clock group. The atomic clock group works with the control circuit to generate a local time reference.

[0028] When this device is in self-timekeeping mode, it receives external time reference signals but does not tame the local atomic clock group. The atomic clock group works with the control circuit to generate a local time reference.

[0029] According to the present invention, a time reference cross-domain transmission device transmits time reference signals as PPS (Pulse Per Second) and TOD (Time of Day).

[0030] According to the present invention, a time reference inter-domain transfer device is provided, wherein the atomic clock group consists of three or more high-precision frequency reference atomic clocks, and the atomic clocks include one or more of rubidium atomic clocks, cesium atomic clocks and hydrogen atomic clocks.

[0031] The present invention also provides a cross-domain transfer method for a time reference cross-domain transfer device, comprising the following steps:

[0032] S1: Periodically monitor the historical data of short-term stability, abnormal jump rate and phase noise of the atomic clocks in the atomic clock group, monitor faulty atomic clocks in real time, and re-include faulty atomic clocks with qualified monitoring results into the joint timekeeping category to obtain joint timekeeping atomic clocks.

[0033] S2: Calculate a comprehensive score based on the historical data of the joint timekeeping atomic clock;

[0034] S3: Based on the comprehensive score, assign dynamic weights to each atomic clock, use a weighted average algorithm to generate the main time scale of the atomic clock group, and use the control circuit to generate PPS and TOD time reference signals.

[0035] This invention also provides a cross-domain transfer method for a time reference cross-domain transfer device, wherein the method for determining short-term stability is based on the overlap Allan variance. The evaluation formula is as follows:

[0036]

[0037] in, The total number of data samples. The number of data points in each group. Sampling time, for Within a time period One sampling deviation, The ordinal number of the grouped data. for Within a time period One sampling deviation.

[0038] The present invention also provides a cross-domain transfer method for a time reference cross-domain transfer device. When the quality of the external clock reference signal deteriorates, a dynamic tracing method is used to adjust the operating mode. The steps of the dynamic tracing method are as follows:

[0039] S11: The device is set to external synchronization mode in the default attitude, and the external time reference signal is monitored and received in real time.

[0040] S12: The device compares the monitoring results of the external time reference signal and the local atomic clock group. If the quality of the external time reference signal is inferior to that of the local atomic clock group for a fixed duration, it switches to self-timekeeping mode and stops the external signal from controlling the local atomic clock group. Otherwise, it maintains the current attitude to monitor the received external time reference signal.

[0041] S13: The device compares the monitoring results of the external time reference signal and the local atomic clock group. When the quality of the external time reference signal is inferior to that of the local atomic clock group for a fixed period of time, the device switches its attitude using the levitation control device to receive and monitor the external time reference signal in the other attitude.

[0042] S14: The device compares the monitoring results of the external time reference signal and the local atomic clock group. If the quality of the external time reference signal is better than that of the local atomic clock group for a fixed duration, it switches to the external synchronization mode, enables the external signal to discipline the local atomic clock group, maintains the attitude discipline synchronization set time, and then switches to the default attitude and repeats S11; otherwise, it repeats S13.

[0043] The above-described one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0044] The present invention provides a time reference cross-domain transmission device and method that ensures high reliability and stability through multi-atomic clock joint timekeeping; the device reduces the impact of abnormal external signals on the time reference signal through dynamic tracing, improves the robustness and accuracy of the system, completes high-precision cross-domain transmission of the time reference, and meets the time synchronization requirements of underwater units.

[0045] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in this 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0047] Figure 1 This is to demonstrate a scenario of cross-domain transfer of time references.

[0048] Figure 2 This is a schematic diagram of the structural composition of a time reference cross-domain transfer device.

[0049] Figure 3 This is a flowchart of a dynamic traceability time reference cross-domain transfer method for a time reference cross-domain transfer device.

[0050] Figure label:

[0051] 1. Retractable integrated antenna; 2. Satellite navigation receiver; 3. Radio receiver; 4. Underwater acoustic transceiver; 5. Laser transceiver; 6. Atomic clock assembly; 7. Power module; 8. Suspension module. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. The following embodiments are used to illustrate this invention but cannot be used to limit the scope of this invention.

[0053] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0055] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] Example

[0058] The following is combined with Figures 1 to 3 This invention is described.

[0059] like Figure 1 As shown, a time reference cross-domain transmission device and method are based on a semi-submersible buoy device deployed on the water surface and underwater to transmit time reference signals. The device receives time reference signals on the water surface and underwater in two attitudes: floating on the water surface and submerged in the water. By real-time monitoring of the local atomic clock group and external time reference signals, local and external interference factors affecting the cross-domain transmission of the time reference are eliminated in real time, thereby improving the reliability and stability of the time reference network and completing the cross-domain transmission of high-precision time reference. Figure 1This device receives satellite radio frequency signals from four navigation systems: GPS, GLONASS, Galileo, and BeiDou; it also receives radio frequency signals from shortwave, longwave, and very low frequency radio stations; and it receives underwater acoustic and laser time reference signals from other devices and fiber optic underwater stations. This device is used to provide time reference signals to surface vessels and underwater submersibles.

[0060] Specifically, such as Figure 2 As shown, Figure 2 A schematic diagram of the structural composition of a time reference inter-domain transfer device includes the following components: a surface receiving and transmitting module, an underwater receiving and transmitting module, an atomic clock group 6, a power supply module 7, a control circuit, and a levitation module 8.

[0061] The power module 7 is connected to the surface transmitter module, the underwater transmitter module, the atomic clock group 6, and the levitation module 8;

[0062] The control circuit is connected to the surface receiving and transmitting module, the underwater receiving and transmitting module, the atomic clock group 6, and the levitation module 8;

[0063] The water surface transceiver module is used to receive and transmit time reference signals above the water surface, and simultaneously perform time reference signal calculation.

[0064] The underwater transceiver module is used to receive and transmit time reference signals below the water surface, and simultaneously perform time reference signal calculation.

[0065] The power module 7 is used to supply power to the surface transmitter module, the underwater transmitter module, the atomic clock group 6 and the levitation module 8.

[0066] The control circuit includes a control algorithm for controlling the operation of the surface transmitter module, the underwater transmitter module, the atomic clock group 6, the power module 7, and the levitation module 8.

[0067] The levitation module 8 is used to control the device's buoyancy and diving depth in water.

[0068] Specifically, the water surface transceiver module includes a retractable integrated antenna 1, a satellite navigation receiver 2, and a radio receiver 3;

[0069] The retractable integrated antenna 1 is connected to the satellite navigation receiver 2;

[0070] The retractable integrated antenna 1 is connected to the radio receiver 3;

[0071] The retractable integrated antenna 1 is used to receive time reference signals and convert the signals into satellite radio frequency signals processed by satellite navigation receiver 2 and radio station radio frequency signals processed by radio receiver 3;

[0072] The satellite navigation receiver 2 is used to process satellite radio frequency signals and complete the calculation of satellite time reference signals;

[0073] The radio receiver 3 is used to process radio frequency signals from the radio station and to perform the calculation of the radio station time reference signal.

[0074] Specifically, the underwater transceiver module includes an acoustic transceiver device 4 and a laser transceiver device 5.

[0075] The underwater acoustic receiver 4 is connected to the control circuit;

[0076] The laser receiving and transmitting device 5 is connected to the control circuit;

[0077] The underwater acoustic transceiver 4 is used to receive and transmit underwater acoustic time reference signals, and at the same time complete the calculation of the time reference signals;

[0078] The laser receiving and transmitting device 5 is used to receive and transmit laser time reference signals, and at the same time complete the calculation of the time reference signals.

[0079] Specifically, this device has two states: floating on the water surface and submerged in water.

[0080] When the device is floating on the water surface, it receives satellite and radio time reference signals from the water surface, as well as underwater acoustic time reference signals and laser time reference signals from underwater.

[0081] When the device is in a submerged state, it receives underwater acoustic and laser time reference signals and periodically rises to receive satellite signals to calibrate deviations.

[0082] Specifically, this device has two operating modes:

[0083] When this device is in external synchronization mode, it is used to receive external time reference signals and tame the local atomic clock group 6. The atomic clock group works with the control circuit to generate a local time reference.

[0084] When this device is in self-timekeeping mode, it receives external time reference signals but does not tame the local atomic clock group 6. The atomic clock group works with the control circuit to generate a local time reference.

[0085] The solution effectively reduces the impact of abnormal external signals, such as satellite signal blockage and underwater acoustic signal interference, on the time reference by setting two attitudes and two working modes, thereby improving the system's robustness and accuracy.

[0086] Specifically, the time reference signals transmitted by this device are PPS and TOD.

[0087] The clock signal output by this device is a standard signal, adapted to actual application needs, and can be directly adapted to the time synchronization requirements of underwater equipment without the need for an additional signal conversion module, reducing the integration difficulty in practical applications; moreover, it takes into account both high precision and practicality, meeting the high requirements for time synchronization accuracy in different scenarios, and enabling rapid deployment and application.

[0088] Specifically, the atomic clock group 6 consists of three or more rubidium atomic clocks with high-precision frequency references. The atomic clocks include one or more of rubidium, cesium, and hydrogen atomic clocks.

[0089] The device provided by this invention reduces the impact of abnormal external signals on the time reference signal compared with traditional methods, improves the robustness and accuracy of the system, completes high-precision cross-domain transmission of the time reference, and meets the time synchronization requirements of underwater units.

[0090] like Figure 3 As shown, specifically, the present invention also provides a method for time-domain transfer, comprising the following steps:

[0091] S1: Periodically monitor the historical data of short-term stability, abnormal jump rate and phase noise of the atomic clocks in the atomic clock group, and use the dynamic tracing method to monitor the faulty atomic clocks in real time. Faulty atomic clocks with qualified monitoring results are re-included into the joint timekeeping category to obtain the joint timekeeping atomic clock.

[0092] Specifically, the method for determining short-term stability uses overlapping Allan variance. The evaluation formula is as follows:

[0093]

[0094] in, The total number of data samples. The number of data points in each group. Sampling time, for Within a time period One sampling deviation, The ordinal number of the grouped data. for Within a time period One sampling deviation.

[0095] Specifically, the larger the overlap Allan variance, the worse the atomic clock performance; the abnormal jump rate is the number of abnormal phase and frequency jumps of the atomic clock during the data statistics period, and the larger the number, the worse the atomic clock performance; the phase noise is the single-sideband phase noise value (unit: dBc / Hz) at a specific offset frequency, and the larger the phase noise, the worse the atomic clock performance.

[0096] In this embodiment, an atomic clock is determined to be a faulty atomic clock if it meets one or more of the above characteristics, such as a short-term stability deviation of more than one order of magnitude from the normal value, an abnormal jump rate of more than 10 times that of other atomic clocks, and a phase noise of more than 10 times that of other atomic clocks.

[0097] S2: Calculate a comprehensive score based on the historical data of the joint timekeeping atomic clocks. Specifically, in this embodiment, the comprehensive score is calculated as follows: each atomic clock has a maximum score of 10 points, with short-term stability accounting for 5 points, abnormal jump rate accounting for 3 points, and indicators such as phase noise accounting for 2 points. Let the score of a certain indicator be X, and the score corresponding to the k-th atomic clock be... The corresponding index score of the k-th atomic clock for:

[0098]

[0099] in, This represents the highest score for an atomic clock. This is the lowest score for the atomic clock.

[0100] S3: Based on the comprehensive score, assign dynamic weights to each atomic clock, use a weighted average algorithm to generate the main time scale of the atomic clock group, and use the control circuit to generate PPS and TOD time reference signals.

[0101] Finally, a comprehensive score for the atomic clocks is calculated. The dynamic weighting of the atomic clocks and the generation of the main time scale for the atomic clock group are as follows: based on the scores of each atomic clock, weights are assigned to each atomic clock from highest to lowest, with higher scores resulting in greater weights, and the sum of all atomic clock weights is 1. The main time scale for the atomic clock group is generated based on the weights of each atomic clock. The 1PPS clock difference between each atomic clock and the reference source is calculated, and the 1PPS clock difference between the atomic clock group and the reference source is calculated according to the weights of each atomic clock. In this embodiment of the invention, a time reference signal obtained from satellite signals is preferentially used as the reference source.

[0102] Specifically, the time reference cross-domain transmission device adopts a dynamic tracing method to reduce the impact of abnormal external signals on the time reference signal, and the steps are as follows:

[0103] S11: The device is set to external synchronization mode in the default attitude, and the external time reference signal is monitored and received in real time.

[0104] S12: The device compares the monitoring results of the external time reference signal and the local atomic clock group. If the quality of the external time reference signal is inferior to that of the local atomic clock group for a fixed duration, it switches to self-timekeeping mode and stops the external signal from controlling the local atomic clock group. Otherwise, it maintains the current attitude to monitor the received external time reference signal.

[0105] S13: The device compares the monitoring results of the external time reference signal and the local atomic clock group. When the quality of the external time reference signal is inferior to that of the local atomic clock group for a fixed period of time, the device switches its attitude using the levitation control device to receive and monitor the external time reference signal in the other attitude.

[0106] S14: The device compares the monitoring results of the external time reference signal and the local atomic clock group. If the quality of the external time reference signal is better than that of the local atomic clock group for a fixed duration, it switches to the external synchronization mode, enables the external signal to discipline the local atomic clock group, maintains the attitude discipline synchronization set time, and then switches to the default attitude and repeats S11; otherwise, it repeats S13.

[0107] Specifically, the dynamic tracing method in this embodiment of the invention includes the following steps:

[0108] Step 1: Set the semi-submersible to external synchronization mode in the default attitude. Determine whether the default attitude of the semi-submersible is submerged in water. If so, float on the surface every 30 days to receive satellite signals and tame the local clock for 6 hours.

[0109] Step 2: Monitor the received external time reference signal in real time at the default attitude;

[0110] Step 3: In this embodiment of the invention, the monitoring results of the external time reference signal and the local atomic clock group are compared. If the quality of the external time reference signal is inferior to that of the local atomic clock group for 2 hours, the system is switched to self-timekeeping mode to stop the external signal from controlling the atomic clock group; otherwise, the system maintains the current state and monitors the external time reference signal.

[0111] Step 4: In this embodiment of the invention, the monitoring results of the external time reference signal and the local atomic clock group are compared. If the quality of the external time reference signal is inferior to that of the local atomic clock group for 24 hours, the attitude is switched using the levitation control device to receive the external time reference signal in another attitude.

[0112] Step 5: In this embodiment of the invention, the monitoring results of the external time reference signal and the local atomic clock group are compared. If the quality of the external time reference signal is better than that of the local atomic clock group for 24 hours, the external synchronization mode is switched to enable the external signal to tame the atomic clock group. Step 2 is repeated; otherwise, Step 4 is repeated.

[0113] Land-based tests have verified that the timekeeping capability of the multi-atomic clock joint timekeeping method is superior to that of the single-atomic clock timekeeping method. It can be concluded that in the scenario of cross-domain transmission of time reference, the use of the multi-atomic clock joint timekeeping method can improve system performance.

[0114] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0116] It should be noted that the embodiments of this disclosure can be implemented using hardware, software, or a combination of both. The hardware portion can be implemented using dedicated logic; the software portion can be stored in memory and executed by a suitable instruction execution system, such as a microprocessor or dedicated-design hardware. Those skilled in the art will understand that the above-described devices and methods can be implemented using computer-executable instructions and / or included in processor control code, for example, such code provided on a programmable memory or a data carrier such as an optical or electronic signal carrier.

[0117] Furthermore, although the operation of the methods of this disclosure is described in a specific order in the accompanying drawings, this does not require or imply that these operations must be performed in that specific order, or that all the operations shown must be performed to achieve the desired result. Rather, the steps depicted in the flowcharts may be performed in a different order. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps. It should also be noted that the features and functions of two or more devices according to this disclosure may be embodied in one device. Conversely, the features and functions of one device described above may be further divided and embodied by multiple devices.

[0118] While this disclosure has been described with reference to several specific embodiments, it should be understood that this disclosure is not limited to the specific embodiments disclosed. This disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A time reference cross-domain transfer device, characterized in that, include: Surface transceiver module, underwater transceiver module, atomic clock assembly, power supply module, control circuit, and levitation module: The power module is connected to the surface transmitter module, the underwater transmitter module, the atomic clock group, and the levitation module; The control circuit is connected to the surface receiving module, the underwater receiving module, the atomic clock group, and the levitation module; The water surface transceiver module is used to receive and transmit time reference signals above the water surface, and simultaneously perform time reference signal calculation. The underwater transceiver module is used to receive and transmit time reference signals below the water surface, and simultaneously perform time reference signal calculation. The power module is used to supply power to the surface transceiver module, the underwater transceiver module, the atomic clock group, and the levitation module; The control circuit includes a control algorithm for controlling the operation of the surface transmitter module, the underwater transmitter module, the atomic clock group, the power supply module, and the levitation module. The levitation module is used to control the device's buoyancy and diving depth in water; This device has two operating modes: external synchronization mode and self-timekeeping mode. When this device is in external synchronization mode, it is used to receive external time reference signals and tame the local atomic clock group. The atomic clock group works with the control circuit to generate a local time reference. When this device is in self-timekeeping mode, it is used to receive external time reference signals but not to control the local atomic clock group. The atomic clock group works with the control circuit to generate a local time reference. The cross-domain transmission method of this device includes the following steps: S1: Periodically monitor the historical data of short-term stability, abnormal jump rate and phase noise of the atomic clocks in the atomic clock group, monitor faulty atomic clocks in real time, and re-include faulty atomic clocks with qualified monitoring results into the joint timekeeping category to obtain joint timekeeping atomic clocks. S2: Calculate a comprehensive score based on the historical data of the joint timekeeping atomic clock; S3: Based on the comprehensive score, assign dynamic weights to each atomic clock, use a weighted average algorithm to generate the main time scale of the atomic clock group, and use the control circuit to generate PPS and TOD time reference signals; When the quality of the external clock reference signal deteriorates, a dynamic tracing method is used to adjust the operating mode. The steps of the dynamic tracing method are as follows: S11: The device is set to external synchronization mode in the default attitude, and the external time reference signal is monitored and received in real time. S12: The device compares the monitoring results of the external time reference signal and the local atomic clock group. If the quality of the external time reference signal is inferior to that of the local atomic clock group for a fixed duration, it switches to self-timekeeping mode and stops the external signal from controlling the local atomic clock group. Otherwise, it maintains the current attitude to monitor the received external time reference signal. S13: The device compares the monitoring results of the external time reference signal and the local atomic clock group. When the quality of the external time reference signal is inferior to that of the local atomic clock group for a fixed period of time, the device switches its attitude using the levitation control device to receive and monitor the external time reference signal in the other attitude. S14: The device compares the monitoring results of the external time reference signal and the local atomic clock group. If the quality of the external time reference signal is better than that of the local atomic clock group for a fixed duration, it switches to the external synchronization mode, enables the external signal to discipline the local atomic clock group, maintains the attitude discipline synchronization set time, and then switches to the default attitude and repeats S11; otherwise, it repeats S13.

2. The time reference cross-domain transfer device according to claim 1, characterized in that, The surface transceiver module includes a retractable integrated antenna, a satellite navigation receiver, and a radio receiver; The retractable integrated antenna is connected to the satellite navigation receiver; The retractable integrated antenna is connected to the radio receiver; The retractable integrated antenna is used to receive time reference signals and convert the signals into satellite radio frequency signals processed by the satellite navigation receiver and radio station radio frequency signals processed by the radio receiver. The satellite navigation receiver is used to process satellite radio frequency signals and complete the calculation of satellite time reference signals; The radio receiver is used to process radio frequency signals from the radio station and to perform the calculation of the radio station time reference signal.

3. The time reference cross-domain transfer device according to claim 1, characterized in that, The underwater transceiver module includes an acoustic transceiver device and a laser transceiver device: The underwater acoustic receiver and control circuit are connected; The laser receiving and transmitting device is connected to the control circuit; The underwater acoustic transceiver is used to receive and transmit underwater acoustic time reference signals, and at the same time to perform the calculation of the time reference signals; The laser receiving and transmitting device is used to receive and transmit laser time reference signals, and simultaneously perform time reference signal calculation.

4. The time reference cross-domain transfer device according to claim 1, characterized in that, This device can float on the water surface and submerge in water. When the device is floating on the water surface, it receives satellite and radio time reference signals from the water surface, as well as underwater acoustic time reference signals and laser time reference signals from underwater. When the device is in a submerged state, it receives underwater acoustic and laser time reference signals and periodically rises to receive satellite signals to calibrate deviations.

5. The time reference cross-domain transfer device according to claim 1, characterized in that, The time reference signals transmitted by this device are PPS and TOD.

6. The time reference cross-domain transfer device according to claim 1, characterized in that, The atomic clock group consists of three or more high-precision frequency reference atomic clocks, including one or more of rubidium atomic clocks, cesium atomic clocks, and hydrogen atomic clocks.

7. The time reference cross-domain transfer device according to claim 1, characterized in that, The method for determining short-term stability uses overlapping Allan variance. The evaluation formula is as follows: in, The total number of data samples. The number of data points in each group. Sampling time, for Within a time period One sampling deviation, The ordinal number of the grouped data. for Within a time period One sampling deviation.

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