An embedded clock synchronization device

Abstract

This utility model discloses an embedded clock synchronization device, comprising a first embedded timing unit located locally and at least one second embedded timing unit located remotely. The first embedded timing unit includes a BeiDou timing module located on land, and a first clock synchronization module, a first high-precision clock module, and a first external timing interface circuit located underwater. The second embedded timing unit includes a second clock synchronization module, a second high-precision clock module, and a second external timing interface circuit located underwater. The input terminal of the first clock synchronization module is connected to the BeiDou timing module and the first high-precision clock module, and its output terminal is connected to the first external timing interface circuit. The input terminal of the second clock synchronization module is connected to the first external timing interface circuit and the second high-precision clock module, and its output terminal is connected to the second external timing interface circuit. This utility model solves the problem of time synchronization for multiple local and remote underwater devices.

Description

Technical Field

[0001] This utility model relates to the field of clock synchronization technology, and in particular to an embedded clock synchronization device. Background Technology

[0002] Synchronized clocks are becoming increasingly important in the field of information processing, especially in coordinating computational processing between different devices and between devices located in different locations. A precise clock system can ensure that the time of each device is consistent with the standard time, thus ensuring the synchronicity and simultaneity of information processing.

[0003] Especially with the increase in the number of underwater acoustic signal processing channels and the improvement in accuracy and complexity, the demand for computing power has further expanded. Often, multiple computing devices work simultaneously, forming a computing resource pool, or even requiring the establishment of multiple computing resource pools. Therefore, the synchronization problem between these computing devices has become particularly important and a pressing issue for the industry. Moreover, multiple computing resource pools may be located in different underwater locations. Compared to the ease of satellite time synchronization for ground-based equipment, achieving time synchronization among multiple remote underwater devices is much more difficult. In particular, the need to consider the concealment and security of underwater equipment further increases the difficulty of time synchronization among multiple remote underwater devices.

[0004] Furthermore, the increasing demands for information security have created new requirements for domestically produced components and modules. Currently, most time synchronization modules rely heavily on imported components, resulting in relatively simple time synchronization methods. While these methods meet the time synchronization requirements, they pose information security risks. In addition, the underwater signal processing field involves multi-channel underwater acoustic signal conditioning, acquisition, processing, and computation processes, requiring simultaneous acquisition and processing. Therefore, how to consider the time synchronization of various processing units and flexible time synchronization interfaces in the design of underwater acoustic signal processing systems has become a crucial issue for developers in the underwater acoustic industry. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] Based on the above problems, this utility model provides an embedded clock synchronization device to solve the time synchronization problem of multiple local and remote underwater devices.

[0007] (II) Technical Solution

[0008] To address the aforementioned technical issues, this utility model provides an embedded clock synchronization device, comprising a first embedded timing unit located locally and at least one second embedded timing unit located remotely. The first embedded timing unit includes a BeiDou timing module located on the ground, and a first clock synchronization module, a first high-precision clock module, and a first external timing interface circuit located underwater. The second embedded timing unit includes a second clock synchronization module, a second high-precision clock module, and a second external timing interface circuit located underwater. The input terminal of the first clock synchronization module is connected to the BeiDou timing module and the first high-precision clock module, and the output terminal is connected to the first external timing interface circuit. The first external timing interface circuit connects to multiple local devices, and the BeiDou timing module is connected to the BeiDou satellite navigation system via an antenna. The input terminal of the second clock synchronization module is connected to the second high-precision clock module and the first external timing interface circuit, and the output terminal is connected to the second external timing interface circuit. The second external timing interface circuit connects to multiple remote devices.

[0009] The BeiDou time synchronization module is used to parse the received BeiDou time; the first high-precision clock module and the second high-precision clock module provide high-precision clock frequencies for the corresponding clock synchronization modules; the first clock synchronization module and the second clock synchronization module are used to tame the local clock and quickly achieve frequency and phase synchronization calibration based on the received BeiDou time and the input clock frequency of the corresponding high-precision clock module.

[0010] Furthermore, the BeiDou timing module is connected to the first clock synchronization module via a serial port.

[0011] Furthermore, the first high-precision clock module and the second high-precision clock module adopt the XHTF1045 chip atomic clock module.

[0012] Furthermore, the first clock synchronization module and the second clock synchronization module adopt the CM35P clock module.

[0013] Furthermore, both the first and second external time synchronization interface circuits include an Ethernet optical port, an Ethernet electrical port, an electrical port for 1PPS+TOD signals, and an optical port for 1PPS+TOD signals.

[0014] Furthermore, the Ethernet port is brought out through the PHY chip YT8531SH.

[0015] Furthermore, the Ethernet optical port is brought out through an external OCB3823 optical module.

[0016] Furthermore, the optical port of the 1PPS+TOD signal is brought out using the photoelectric conversion module OCB4343.

[0017] Furthermore, the electrical port of the 1PPS+TOD signal is brought out using the RS232 interface chip CA-IF43232E.

[0018] (III) Beneficial Effects

[0019] The above-mentioned technical solution of this utility model has the following advantages:

[0020] (1) This utility model uses the Beidou satellite navigation system as the standard time information source. It only needs the local Beidou time synchronization module to receive Beidou time. It can synchronize the local equipment through the local clock synchronization module, and can also connect to the remote clock synchronization module through the network port to synchronize the remote equipment. It effectively realizes the time synchronization of multiple local and remote underwater equipment.

[0021] (2) All the remote equipment of this utility model is located underwater, and only the local Beidou timing module is located on the ground. It has high security, good concealment and strong adaptability.

[0022] (3) This utility model can use an electrical port or an optical port to synchronize the time of local or remote devices. It is compatible with different time synchronization interfaces, has anti-interference models, and is suitable for many scenarios. It can be used as a time synchronization device or a timekeeping device, and has good versatility. Attached Figure Description

[0023] The features and advantages of this utility model will be more clearly understood by referring to the accompanying drawings. The drawings are schematic and should not be construed as limiting the utility model in any way. In the drawings:

[0024] Figure 1 This is a schematic diagram of the overall structure of the embedded clock synchronization device according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the first embedded timing unit according to an embodiment of the present invention;

[0026] Figure 3 This is a circuit diagram of the Ethernet port according to an embodiment of the present invention;

[0027] Figure 4 This is a circuit diagram of the Ethernet optical port according to an embodiment of the present invention;

[0028] Figure 5 This is a circuit diagram of the electrical port of the 1PPS+TOD signal in an embodiment of this utility model.

[0029] Figure 6 This is a circuit diagram of the optical port for the 1PPS+TOD signal in an embodiment of this utility model. Detailed Implementation

[0030] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0031] This utility model embodiment is an embedded clock synchronization device, such as... Figure 1 As shown, it includes a first embedded timing unit located locally and at least one second embedded timing unit located remotely. The first embedded timing unit is as follows: Figure 2 As shown, it includes a BeiDou time synchronization module located on the ground, and a first clock synchronization module, a first high-precision clock module, and a first external time synchronization interface circuit located underwater. The second embedded time synchronization unit differs from the first embedded time synchronization unit in that it does not have a BeiDou time synchronization module, and includes a second clock synchronization module, a second high-precision clock module, and a second external time synchronization interface circuit located underwater.

[0032] The first clock synchronization module has its input connected to the BeiDou time synchronization module and the first high-precision clock module, and its output connected to the first external time synchronization interface circuit. The first external time synchronization interface circuit connects to multiple local devices. The BeiDou time synchronization module is connected to the BeiDou satellite navigation system via an antenna. The second clock synchronization module has its input connected to the second high-precision clock module and the first external time synchronization interface circuit, and its output connected to the second external time synchronization interface circuit. The second external time synchronization interface circuit connects to multiple remote devices. The BeiDou time synchronization module is used to parse the received BeiDou time and send it to the first clock synchronization module via a serial port. The first and second high-precision clock modules provide high-precision clock frequencies for their respective clock synchronization modules. Based on the received BeiDou time and referring to the input clock frequency of the corresponding high-precision clock module, the first and second clock synchronization modules tame the local clock, quickly achieve frequency and phase synchronization calibration, and enter hold mode after the reference source is lost. The first and second external time synchronization interface circuits are used to synchronize the time of the connected devices.

[0033] The BeiDou time synchronization module receives BeiDou time via an antenna, primarily used to parse the received BeiDou time and send it to the first clock synchronization module via a serial port. This BeiDou time synchronization module is manufactured by domestic company Hexin Xingtong Technology, integrating a true-point RTK algorithm and data services internally, and connected to an external BeiDou antenna. It achieves a time synchronization accuracy better than 20ns, with high stability and reliability. After calculating the BeiDou time information, the BeiDou time synchronization module sends the precise time to the clock synchronization module via a serial port and 1PPS.

[0034] The first and second high-precision clock modules provide high-precision clock sources for the clock synchronization module, serving as one of the reference high-precision clock sources. The high-precision clock module uses the XHTF1045 chip atomic clock module produced by Tian'ao Electronics, which outputs a stable 10MHz precise clock signal to provide a precise working clock for the clock synchronization module.

[0035] Both the first and second external time synchronization interface circuits support Ethernet optical and electrical ports. The external time synchronization interface circuits are designed with two Ethernet PHY chips, connected to the clock synchronization module via the RGMII bus. One of the PHY chips provides a gigabit Ethernet electrical port, using a YT8531SH chip, as the external PTP time synchronization and timekeeping signal transmission channel. Figure 3 As shown, another PHY chip connects to an OCB3823 optical module via a SerDes interface, leading out a gigabit Ethernet optical port as an external PTP time synchronization and timekeeping signal transmission channel, such as... Figure 4 As shown; the first and second external time synchronization interface circuits also support electrical and optical ports for 1PPS+TOD signals, connecting to the clock synchronization module to transmit and receive precise times in TOD (Time of Day) format and 1PPS whole-second start pulse signals, and to extract the 1PPS+TOD signal from the clock synchronization module to complete external time synchronization. The electrical port for the 1PPS+TDO (Time of Day) signal is extracted using an RS232 interface chip, specifically the CA-IF43232E interface chip manufactured by Chuantu Microelectronics, a domestic company, to extract the TDO electrical port. Figure 5 As shown; the 1PPS+TDO (Time of The optical port for the Day signal is implemented using the OCB4343 optoelectronic conversion module manufactured by Yuanchuang Optoelectronic Technology, a domestic company. Figure 6 As shown;

[0036] The first and second clock synchronization modules employ the CM35P clock module manufactured by domestic Dapu Communication. This module uses a high-precision reference clock module as the input clock source to tame the local clock, quickly achieving frequency and phase synchronization calibration. It enters hold mode after the reference source is lost. The CM35P clock module can achieve precise time synchronization or timekeeping via its 1PPS and TOD input / output interfaces; and it can achieve precise time synchronization or timekeeping in PTP format via its Ethernet input / output interfaces.

[0037] The embedded time synchronization device can be configured to process the time information input by the BeiDou time synchronization module and then perform external time synchronization, and can achieve precise time output in 1PPS and TOD formats, as well as precise time output in PTP Ethernet format; the embedded time synchronization device can also be configured to complete local timekeeping through precise time input in 1PPS and TOD formats, or precise time input in PTP Ethernet format.

[0038] The embedded clock synchronization device can achieve local and remote time synchronization. To illustrate the technical effects of this device, its specific operation is as follows:

[0039] Local time synchronization: The BeiDou time synchronization module periodically receives BeiDou time via an antenna, parses the received BeiDou time, and sends it to the first clock synchronization module; the first high-precision clock module sends its clock frequency to the first clock synchronization module; the first clock synchronization module, based on the received BeiDou time and clock frequency, disciplines the local clock of the local device connected to the first external time synchronization interface circuit, quickly achieving frequency and phase synchronization calibration, thus realizing local time synchronization; when the first clock synchronization module cannot receive BeiDou time, it enters hold mode to achieve local time synchronization.

[0040] Remote time synchronization: The first external time synchronization interface circuit also sends the received BeiDou time to the second clock synchronization module; the second high-precision clock module sends the clock frequency to the second clock synchronization module; the second clock synchronization module, based on the received BeiDou time and clock frequency, disciplines the remote clock of the remote device connected to the second external time synchronization interface circuit, quickly achieving frequency and phase synchronization calibration, and realizing remote time synchronization; when the second clock synchronization module cannot receive BeiDou time, it enters hold mode to achieve remote time synchronization.

[0041] The aforementioned time synchronization and timekeeping functions are built-in functions of the clock synchronization module. However, through the clock synchronization device in this embodiment, local time synchronization or timekeeping, as well as remote time synchronization or timekeeping synchronization, can be achieved for multiple devices.

[0042] In summary, the above-described embedded clock synchronization device has the following beneficial effects:

[0043] (1) This utility model uses the Beidou satellite navigation system as the standard time information source. It only needs the local Beidou time synchronization module to receive Beidou time. It can synchronize the local equipment through the local clock synchronization module, and can also connect to the remote clock synchronization module through the network port to synchronize the remote equipment. It effectively realizes the time synchronization of multiple local and remote underwater equipment.

[0044] (2) All the remote equipment of this utility model is located underwater, and only the local Beidou timing module is located on the ground. It has high security, good concealment and strong adaptability.

[0045] (3) This utility model can use an electrical port or an optical port to synchronize the time of local or remote devices. It is compatible with different time synchronization interfaces, has anti-interference models, and is suitable for many scenarios. It can be used as a time synchronization device or a timekeeping device, and has good versatility.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, and not to limit it; although the implementation of this utility model has been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An embedded clock synchronization apparatus, characterized by, The system includes a first embedded timing unit located locally and at least one second embedded timing unit located remotely. The first embedded timing unit includes a BeiDou timing module located on the ground, and a first clock synchronization module, a first high-precision clock module, and a first external timing interface circuit located underwater. The second embedded timing unit includes a second clock synchronization module, a second high-precision clock module, and a second external timing interface circuit located underwater. The input terminal of the first clock synchronization module is connected to the BeiDou timing module and the first high-precision clock module, and the output terminal is connected to the first external timing interface circuit. The first external timing interface circuit connects to multiple local devices. The BeiDou timing module is connected to the BeiDou satellite navigation system via an antenna. The input terminal of the second clock synchronization module is connected to the second high-precision clock module and the first external time synchronization interface circuit, and the output terminal is connected to the second external time synchronization interface circuit. The second external time synchronization interface circuit is connected to multiple remote devices. The BeiDou time synchronization module is used to parse the received BeiDou time; the first high-precision clock module and the second high-precision clock module provide high-precision clock frequencies for the corresponding clock synchronization modules; The first clock synchronization module and the second clock synchronization module are used to tame the local clock and quickly achieve frequency and phase synchronization calibration based on the received BeiDou time and the input clock frequency of the corresponding high-precision clock module.

2. The embedded clock synchronization device of claim 1, wherein, The BeiDou timing module is connected to the first clock synchronization module via a serial port.

3. The embedded clock synchronization device of claim 1, wherein, The first and second high-precision clock modules use XHTF1045 chip atomic clock modules.

4. The embedded clock synchronization device of claim 1, wherein, The first clock synchronization module and the second clock synchronization module both use CM35P clock modules.

5. The embedded clock synchronization device of claim 1, wherein, Both the first and second external time synchronization interface circuits include an Ethernet optical port, an Ethernet electrical port, an electrical port for 1PPS+TOD signals, and an optical port for 1PPS+TOD signals.

6. The embedded clock synchronization device of claim 5, wherein, The Ethernet port is brought out through the PHY chip YT8531SH.

7. The embedded clock synchronization device according to claim 5, characterized in that, The Ethernet optical port is brought out through an external OCB3823 optical module.

8. The embedded clock synchronization device of claim 5, wherein, The optical port of the 1PPS+TOD signal is brought out using the photoelectric conversion module OCB4343.

9. The embedded clock synchronization device according to claim 5, characterized in that, The electrical port for the 1PPS+TOD signal is brought out using the RS232 interface chip CA-IF43232E.

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