Synchronous acquisition optical fiber hydrophone buoy system

Abstract

The utility model discloses a synchronous acquisition optical fiber hydrophone buoy system, and belongs to the technical field of underwater monitoring. Comprising a comprehensive control module, a Beidou trigger module, a hydrophone data acquisition module and an optical fiber hydrophone array, the comprehensive control module is used for executing a command of the upper computer display control system and returning demodulated signal data; the Beidou trigger module is used for receiving a time signal and carrying out time service; the hydrophone data acquisition module is used for acquiring sound wave signals received by a hydrophone; the optical fiber hydrophone array is used for arranging and combining a plurality of optical fiber hydrophones into an array; the optical fiber hydrophone array is connected with the bottom of the buoy through a transmission cable; the Beidou trigger module sends a synchronous trigger signal to the hydrophone data acquisition module, and sends signal data in a time-sharing manner according to the synchronous trigger signal. The underwater sound signal can be synchronously triggered and collected under the cooperative work of a plurality of buoys.

Description

Technical Field

[0001] The utility model relates to the technical field of underwater monitoring, in particular to a synchronously collected optical fiber hydrophone buoy system. Background Art

[0002] Fiber optic hydrophone is an underwater acoustic signal sensor that uses highly sensitive optical coherence detection technology to convert underwater acoustic vibrations into optical signals. Fiber optic hydrophone has the characteristics of high sensitivity, good frequency response characteristics, and large dynamic range. It has important application scenarios in the fields of ocean monitoring and underwater safety.

[0003] The main deployment methods of fiber optic hydrophone arrays include shore-based array deployment, seabed array deployment, workboat deployment, shallow buoy deployment, and buoy deployment. Compared with other deployment methods, the fiber optic hydrophone buoy system has the advantages of high detection accuracy and strong anti-interference ability. When using the fiber optic hydrophone buoy system for underwater detection and underwater positioning, there is a requirement for the synchronization of the hydroacoustic signal, so a fiber optic hydrophone buoy system with synchronous acquisition is very necessary. The existing fiber optic hydrophone buoy system does not have the synchronous acquisition function and cannot meet the requirements of underwater detection and underwater positioning for synchronous hydroacoustic signals. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a synchronously collected optical fiber hydrophone buoy system.

[0005] The purpose of the utility model is achieved through the following technical solutions: a synchronous acquisition optical fiber hydrophone buoy system, including an integrated control module, a Beidou trigger module, a hydrophone data acquisition module, and an optical fiber hydrophone array;

[0006] The integrated control module is used to execute the commands of the upper computer display and control system and return the demodulated signal data; the Beidou trigger module is used to receive the time signal and perform time synchronization; the hydrophone data acquisition module is used to collect the sound wave signal received by the hydrophone; the fiber optic hydrophone array is used to arrange and combine multiple fiber optic hydrophones into an array;

[0007] The integrated control module, Beidou trigger module, and hydrophone data acquisition module are uniformly integrated inside the buoy, and the optical fiber hydrophone array is connected to the bottom of the buoy via a transmission cable;

[0008] The Beidou trigger module sends a synchronous trigger signal to the hydrophone data acquisition module, and sends the signal data in time according to the synchronous trigger signal.

[0009] Preferably, it also includes a wireless data transmission module, which is integrated with the integrated control module, the Beidou trigger module, and the hydrophone data acquisition module inside the buoy, and the wireless data transmission module is connected to the integrated control module via an RJ45 interface.

[0010] Preferably, it also includes a battery management module, which is integrated with the integrated control module, Beidou trigger module, hydrophone data acquisition module and wireless data transmission module inside the buoy. The battery management module includes two units: a power supply and a power management board. The battery management module is the power supply unit of the fiber optic hydrophone buoy system, which is divided into 5 routes through the power management board to power the Beidou trigger module, integrated control module, hydrophone data acquisition module and wireless data transmission module respectively.

[0011] Preferably, the integrated control module uses Raspberry Pi CM4 as the control core and an SD card as the data storage unit. The Raspberry Pi CM4 saves the received hydroacoustic data and position information in the SD card and performs preprocessing operations on the hydroacoustic data of the optical fiber hydrophone, and transmits the data back to the communication terminal of the integrated control module through the wireless data transmission module.

[0012] Preferably, the Beidou trigger module includes two units: a Beidou positioning module and a trigger board. The Beidou external antenna is placed on the top of the antenna barrel. The Beidou positioning module is connected to the Raspberry Pi CM4 via an RS485 serial port. The Beidou positioning module obtains time and location information and transmits it to the Raspberry Pi CM4 via the RS485 serial port, and is bidirectionally connected to the trigger board via the IPEX1 signal line; the trigger board is bidirectionally connected to the Raspberry Pi CM4 via the IPEX1 signal line; the trigger board uses a single-chip microcomputer with an STM32 core.

[0013] Preferably, the hydrophone data acquisition module includes three units: a light source, a photoelectric detector, and a data acquisition card. The photoelectric detector is connected to the data acquisition card via an IPEX1 signal line. The data acquisition card is connected to the Raspberry Pi CM4 via an RJ45 interface and is bidirectionally connected to the trigger board via the IPEX1 signal line.

[0014] Preferably, the fiber optic hydrophone array is connected to the light source via one end of an external circulator, and the other end of the fiber optic hydrophone is connected to the photodetector.

[0015] Preferably, the communication terminal of the fiber optic hydrophone buoy system is a host computer display and control system, which sends commands to the integrated control module to realize the entire process of signal acquisition; the host computer display and control system realizes data acquisition card parameter configuration, mode selection, and control acquisition start and stop through Raspberry Pi CM4 transparent transmission.

[0016] Preferably, the data acquisition card has a triggered working mode, the Beidou trigger module completes the timing and longitude and latitude acquisition, the Beidou positioning module transmits the timing result to the trigger board via the IPEX1 signal line, and the trigger board periodically provides a trigger signal to the data acquisition card through the IPEX1 signal line according to the configuration, and the data acquisition card starts working after receiving the trigger pulse to complete the acquisition function.

[0017] Preferably, the data acquisition card has a continuous sampling working mode, and the data acquisition card performs sampling according to set parameters after receiving a start sampling instruction.

[0018] The beneficial effects of the utility model are:

[0019] 1) The synchronous triggering and collection of underwater sound signals by multiple buoys working together is realized. The synchronized fiber optic hydrophone array acoustic data is of great significance to the development of underwater acoustic positioning algorithms.

[0020] 2) The synchronous fiber optic hydrophone buoy system uses Raspberry Pi as the core controller, uses Beidou module for synchronous timing, and sends synchronous trigger signals to the data acquisition card through the trigger board to achieve synchronous acquisition function. The system sends the original data in time according to the synchronous trigger signal, which reduces the bandwidth requirements of wireless communication. Multi-buoy data provides a data basis for underwater detection and positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the fiber optic hydrophone buoy system for synchronous data collection in the utility model. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1 , the utility model provides a technical solution: a synchronous acquisition fiber optic hydrophone buoy system, including an integrated control module, a Beidou trigger module, a hydrophone data acquisition module, and a fiber optic hydrophone array;

[0024] The integrated control module is used to execute the commands of the upper computer display and control system and return the demodulated signal data; the Beidou trigger module is used to receive the time signal and perform time synchronization; the hydrophone data acquisition module is used to collect the sound wave signal received by the hydrophone; the fiber optic hydrophone array is used to arrange and combine multiple fiber optic hydrophones into an array;

[0025] The integrated control module, Beidou trigger module, and hydrophone data acquisition module are uniformly integrated inside the buoy, and the optical fiber hydrophone array is connected to the bottom of the buoy via a transmission cable;

[0026] The Beidou trigger module sends a synchronous trigger signal to the hydrophone data acquisition module, and sends the signal data in time according to the synchronous trigger signal.

[0027] In some embodiments, it also includes a wireless data transmission module, which is integrated with the integrated control module, Beidou trigger module, and hydrophone data acquisition module inside the buoy, and the wireless data transmission module is connected to the integrated control module via an RJ45 interface.

[0028] In some embodiments, it also includes a battery management module, which is integrated with the integrated control module, Beidou trigger module, hydrophone data acquisition module and wireless data transmission module inside the buoy. The battery management module includes two units: a power supply and a power management board. The battery management module is the power supply unit of the fiber optic hydrophone buoy system, which is divided into 5 routes through the power management board to power the Beidou trigger module, the integrated control module, the hydrophone data acquisition module and the wireless data transmission module respectively.

[0029] In some embodiments, the integrated control module uses Raspberry Pi CM4 as the control core and an SD card as the data storage unit. The Raspberry Pi CM4 saves the received hydroacoustic data and location information in the SD card and performs preprocessing operations on the fiber optic hydrophone hydroacoustic data, and transmits it back to the communication terminal of the integrated control module through the wireless data transmission module.

[0030] In some embodiments, the Beidou trigger module includes two units: a Beidou positioning module and a trigger board. The Beidou external antenna is placed on the top of the antenna barrel. The Beidou positioning module is connected to the Raspberry Pi CM4 via an RS485 serial port. The Beidou positioning module obtains time and location information and transmits it to the Raspberry Pi CM4 via the RS485 serial port, and is bidirectionally connected to the trigger board via the IPEX1 signal line; the trigger board is bidirectionally connected to the Raspberry Pi CM4 via the IPEX1 signal line; the trigger board uses a single-chip microcomputer with an STM32 core.

[0031] In some embodiments, the hydrophone data acquisition module includes three units: a light source, a photoelectric detector, and a data acquisition card. The photoelectric detector is connected to the data acquisition card via an IPEX1 signal line. The data acquisition card is connected to the Raspberry Pi CM4 via an RJ45 interface and is bidirectionally connected to the trigger board via an IPEX1 signal line.

[0032] In some embodiments, the fiber optic hydrophone array is connected to the light source via one end of an external circulator, and the other end of the fiber optic hydrophone is connected to the photodetector.

[0033] In some embodiments, the fiber optic hydrophone buoy system communication terminal is a host computer display and control system, which sends commands to the integrated control module to realize the entire signal acquisition process; the host computer display and control system transmits through the Raspberry Pi CM4 to realize data acquisition card parameter configuration, mode selection, and control acquisition start and stop.

[0034] In some embodiments, the data acquisition card has a triggered working mode, the Beidou trigger module completes the timing and longitude and latitude acquisition, the Beidou positioning module transmits the timing result to the trigger board via the IPEX1 signal line, and the trigger board periodically provides a trigger signal to the data acquisition card through the IPEX1 signal line according to the configuration. After receiving the trigger pulse, the data acquisition card starts working and completes the acquisition function.

[0035] In some embodiments, the data acquisition card has a continuous sampling working mode, and the data acquisition card performs sampling according to the set parameters after receiving the start acquisition instruction.

[0036] During use, press the external switch of the buoy barrel to start the battery power supply. The Raspberry Pi automatically starts running the program to communicate with the host computer network through the wireless module and establish a network connection with the data acquisition card through the network cable.

[0037] The upper computer display and control system transmits data through the Raspberry Pi CM4 to realize data acquisition card parameter configuration, mode selection, and control the start and stop of acquisition.

[0038] When the system is in working state, the Raspberry Pi receives and pre-processes the optical fiber hydrophone acoustic data sent by the data acquisition card through network communication.

[0039] The data acquisition card has two working modes: continuous sampling and triggered sampling. In the continuous mode, the data acquisition card receives the start acquisition instruction through network communication and performs acquisition according to the set parameters. In the triggered mode, the Beidou positioning module receives satellite signals to complete the timing and longitude and latitude acquisition. The Beidou positioning module transmits the timing result to the trigger board through the IPEX1 signal line. The trigger board periodically provides a trigger signal to the data acquisition card through the IPEX1 signal line according to the configuration. The data acquisition card starts working after receiving the trigger pulse to complete the acquisition function.

[0040] The Beidou positioning module obtains time and location information and transmits it to the Raspberry Pi CM4 via the RS485 serial port. The Beidou positioning module can obtain accurate time and location information.

[0041] The Raspberry Pi CM4 saves the received underwater acoustic data and location information in the SD card and transmits it back to the host computer display and control system through the wireless data transmission module.

[0042] When multiple buoys work together, the Beidou positioning module inside the buoy is synchronized with the satellite, and the trigger board sends a pulse signal at a fixed time interval based on the timing result. The synchronized trigger board can output synchronized pulse signals to multiple data acquisition cards, thereby realizing the synchronized acquisition of multiple fiber optic hydrophone buoy systems.

[0043] Due to the limitation of communication bandwidth, the present embodiment adopts the method of trigger time-sharing to send data back to the shore station. According to the number of buoys in actual use, the time interval between two triggers of the trigger board is equally divided, and the trigger board outputs short-time interval pulse signals at the same time. According to the order of short-time pulse signals, multiple buoys complete data transmission in different short time intervals, thereby realizing time-sharing data transmission.

[0044] The utility model is not limited to the use of buoys, and other components that can also achieve the function of buoys can also be used.

[0045] The above is only a preferred embodiment of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A fiber optic hydrophone buoy system for synchronous acquisition, characterized in that: It includes integrated control module, Beidou trigger module, hydrophone data acquisition module, and fiber optic hydrophone array; The integrated control module is used to execute the commands of the upper computer display and control system and return the demodulated signal data; the Beidou trigger module is used to receive the time signal and perform time synchronization; the hydrophone data acquisition module is used to collect the sound wave signal received by the hydrophone; the fiber optic hydrophone array is used to arrange and combine multiple fiber optic hydrophones into an array; The integrated control module, Beidou trigger module, and hydrophone data acquisition module are uniformly integrated inside the buoy, and the optical fiber hydrophone array is connected to the bottom of the buoy via a transmission cable; The Beidou trigger module sends a synchronous trigger signal to the hydrophone data acquisition module, and sends the signal data in time according to the synchronous trigger signal.

2. The synchronous acquisition optical fiber hydrophone buoy system according to claim 1, characterized in that: It also includes a wireless data transmission module, which is integrated with the integrated control module, the Beidou trigger module, and the hydrophone data acquisition module inside the buoy. The wireless data transmission module is connected to the integrated control module via an RJ45 interface.

3. The synchronous acquisition optical fiber hydrophone buoy system according to claim 2, characterized in that: It also includes a battery management module, which is integrated with the integrated control module, Beidou trigger module, hydrophone data acquisition module and wireless data transmission module inside the buoy. The battery management module includes two units: a power supply and a power management board. The battery management module is the power supply unit of the fiber optic hydrophone buoy system, which is divided into 5 routes through the power management board to supply power to the Beidou trigger module, integrated control module, hydrophone data acquisition module and wireless data transmission module respectively.

4. The synchronous acquisition optical fiber hydrophone buoy system according to claim 2, characterized in that: The integrated control module uses Raspberry Pi CM4 as the control core and an SD card as the data storage unit. The Raspberry Pi CM4 saves the received hydroacoustic data and position information in the SD card and performs preprocessing operations on the hydroacoustic data of the optical fiber hydrophone, and transmits the data back to the communication terminal of the integrated control module through the wireless data transmission module.

5. The synchronous acquisition optical fiber hydrophone buoy system according to claim 4, characterized in that: The Beidou trigger module includes two units: a Beidou positioning module and a trigger board. The Beidou external antenna is placed on the top of the antenna barrel. The Beidou positioning module is connected to the Raspberry Pi CM4 through an RS485 serial port. The Beidou positioning module obtains time and position information and transmits it to the Raspberry Pi CM4 through the RS485 serial port, and is bidirectionally connected to the trigger board through an IPEX1 signal line; the trigger board is bidirectionally connected to the Raspberry Pi CM4 through an IPEX1 signal line; the trigger board uses a single-chip microcomputer with an STM32 core.

6. The synchronous acquisition optical fiber hydrophone buoy system according to claim 5, characterized in that: The hydrophone data acquisition module includes three units: a light source, a photoelectric detector, and a data acquisition card. The photoelectric detector is connected to the data acquisition card through an IPEX1 signal line. The data acquisition card is connected to the Raspberry Pi CM4 through an RJ45 interface and is bidirectionally connected to the trigger board through an IPEX1 signal line.

7. The synchronous acquisition optical fiber hydrophone buoy system according to claim 6, characterized in that: The fiber optic hydrophone array is connected to the light source via one end of an external circulator, and the other end of the fiber optic hydrophone is connected to the photoelectric detector.

8. The synchronous acquisition optical fiber hydrophone buoy system according to claim 4, characterized in that: The communication terminal of the fiber optic hydrophone buoy system is a host computer display and control system, which sends commands to the integrated control module to realize the entire process of signal acquisition; the host computer display and control system transmits through the Raspberry Pi CM4 to realize data acquisition card parameter configuration, mode selection, and control acquisition start and stop.

9. The fiber optic hydrophone buoy system for synchronous data collection according to claim 6, characterized in that: The data acquisition card has a triggered working mode. The Beidou trigger module completes the timing and longitude and latitude acquisition. The Beidou positioning module transmits the timing result to the trigger board via the IPEX1 signal line. The trigger board periodically provides a trigger signal to the data acquisition card via the IPEX1 signal line according to the configuration. After receiving the trigger pulse, the data acquisition card starts working and completes the acquisition function.

10. The fiber optic hydrophone buoy system for synchronous data collection according to claim 6, characterized in that: The data acquisition card has a continuous sampling working mode. After receiving the start acquisition instruction, the data acquisition card performs acquisition according to the set parameters.

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