Deep sea low frequency high power underwater acoustic response system and implementation method thereof

Abstract

The application discloses a kind of deep sea low-frequency high-power underwater acoustic response system and its implementation method, including receiving transducer, transmitting transducer, comprehensive processing module, power amplifier module and display operation module, receiving transducer is connected with comprehensive processing module by watertight cable, transmitting transducer is connected with power amplifier by watertight cable, and comprehensive processing module is connected with power amplifier module by signal;Comprehensive processing module is composed of channel switch, signal conditioning acquisition module, signal processing submodule, signal generation emission control submodule and power module, and after sound signal enters comprehensive processing module, it is first received by channel switch Single or double-way receiving transducer parallel switch.The application comprehensively realizes deep sea complex environment response, real-time solution of direct wave pulse level, data real-time storage, data playback and other functions.

Description

Technical fields:

[0001] This invention relates to the field of sonar testing technology, specifically to a deep-sea low-frequency high-power underwater acoustic response system and its implementation method. Background technology:

[0002] As sonar equipment development progresses towards low frequency, high power, and multi-functionality, performance verification often needs to be conducted in conjunction with actual marine environments and real targets. Considering the complexity of different environmental conditions, large-scale targets, due to their high concealment requirements, are difficult to verify in conjunction with surface equipment performance over extended periods, making it difficult to ascertain the performance boundaries and operational effectiveness of sonar equipment. Therefore, there is an urgent need for an underwater acoustic transponder system that can, in actual marine environments, receive direct waves emitted by sonar equipment to simulate acoustic echoes from submarines (or torpedoes, etc.) with different reflection characteristics and motion elements, or simulate radiated noise from submarines (or torpedoes, etc.) with specific spectral characteristics. This would meet the performance verification needs of sonar equipment and support the increasing demands for boundary performance research and testing.

[0003] The conventional method uses a specially designed sphere with a reflectivity matching that of the actual target to be detected. The test vessel tows the target sphere to simulate the actual target, approaching the underwater array of the sonar equipment at a controlled speed. The target's status information is then displayed in real-time on a control panel to verify the sonar equipment's target detection performance. While existing technology has solved the technical and economic problems of sonar equipment target detection experiments, it undoubtedly increases the complexity of the experiments. In complex environments such as high sea states and deep seas, the depth, attitude, and motion of the sphere are difficult to control, making it unsuitable for scientific research experiments. Existing underwater acoustic transponders, although mature, have limited functionality and suffer from significant problems such as high false alarm rates at close range and inability to respond at long range. Summary of the Invention:

[0004] The technical problem to be solved by this invention is to provide a deep-sea low-frequency high-power underwater acoustic response system and its implementation method. The system has four working modes: automatic response, program-controlled response, manual response, and submarine radiated noise simulation. It simulates the acoustic echo reflected by submarine targets with different reflection characteristics and speed characteristics, and simulates the radiated noise of submarines emitting specific spectral characteristics. It comprehensively realizes functions such as response in complex deep-sea environments, real-time calculation of direct wave pulse level, real-time data storage, and data playback.

[0005] The technical solution of the present invention is to provide a deep-sea low-frequency high-power underwater acoustic response system, including a receiving transducer, a transmitting transducer, an integrated processing module, a power amplifier module and a display and operation module. The receiving transducer is connected to the integrated processing module through a watertight cable, the transmitting transducer is connected to the power amplifier through a watertight cable, and the integrated processing module and the power amplifier module are connected by a signal.

[0006] The integrated processing module consists of a channel switching switch, a signal conditioning and acquisition module, a signal processing submodule, a signal generation and transmission control submodule, and a power supply module. After the acoustic signal enters the integrated processing module, it first undergoes a single-channel or dual-channel parallel switching of the receiving transducers via the channel switching switch. Then, it enters the signal conditioning and acquisition module for signal conditioning and acquisition. The signal processing submodule unpacks and processes the acquired data, calculates the response signal parameters and pulse signal level in real time, and packages and stores this signal segment in a buffer. Finally, the signal generation and transmission control submodule generates the response signal. A high-sensitivity receiving transducer can be selected to improve the intensity of the first-stage acoustic-to-electrical conversion. The signal conditioning and acquisition module uses a fully differential instrumentation amplifier to reduce receiving circuit noise, utilizes a high-order bandpass filter to improve the frequency selectivity of the received signal, and employs a wide-range programmable amplifier to improve the dynamic range of the received signal. The received data is sent in real time to the main control processing module through the signal conditioning and acquisition module to complete signal processing, matched filtering, signal generation, and data display.

[0007] Preferably, the power amplifier module includes a transmitting module and a secondary matching module.

[0008] Preferably, the transmitting module includes transmitting module 1, transmitting module 2, and transmitting module 3. The transmitting transducer and power amplifier module constitute the transmitting function system, which adopts multiple sets of linear power amplifier modules in series-output secondary matching method to achieve low-frequency, high-power, high-source-level signal response.

[0009] This system features four operating modes: automatic response, program-controlled response, manual response, and submarine radiated noise simulation. It can simulate acoustic echoes from submarine targets with varying reflection characteristics and speeds, and can also simulate submarine radiated noise with specific spectral characteristics. Integrating functions such as deep-sea complex environment response, real-time calculation of direct wave pulse levels, real-time data storage, and data playback, it meets the requirements for high-precision, high-stability, and high-efficiency target simulation, maximizing the approximation of simulated target echoes to real target characteristics. It boasts high precision, high stability, high efficiency, and fully automatic response, effectively solving the problems of conventional methods being ineffective in complex environments and the high false alarm rate and inability to respond at long distances of traditional underwater acoustic transponders.

[0010] This invention also provides a method for implementing a deep-sea low-frequency high-power underwater acoustic response system, including...

[0011] S1, Real-time data acquisition, includes the following steps.

[0012] S1.1, The receiving transducer is connected to the dry-end integrated processing module via a watertight connector and a watertight cable;

[0013] S1.2 After the acoustic signal enters the integrated processing module, it first switches between single-channel and dual-channel receiving transducers in parallel through a channel switching switch. Then, it enters the first-stage low-noise differential instrumentation amplifier of the signal conditioning and acquisition module for first-stage amplification, and then enters the second-stage programmable amplifier to amplify or reduce the signal, thereby improving the dynamic range of the signal input.

[0014] S1.3, after entering the output of the second-stage programmable amplifier, enters the high-order bandpass filter for filtering, to obtain the in-band signal and filter out the out-of-band signal, thereby improving the signal-to-noise ratio;

[0015] S1.4 The filtered in-band single-ended signal is further improved by a single-ended to differential low-noise instrumentation amplifier before being sent to a high-precision differential ADC for analog-to-digital conversion.

[0016] S1.5, the signal conditioning and acquisition module packages the analog-to-digital converted data and sends it to the network data group in real time;

[0017] S2, receiving data and processing it in real time, includes the following steps:

[0018] S2.1, The signal processing submodule receives real-time data collected from the network data group and performs unpacking processing on it;

[0019] S2.2, the unpacked acoustic data is stored in a large-capacity EMMC memory in real time and simultaneously processed by high-order FIR filtering, windowing, FFT calculation, matched filtering, correlation matching calculation and threshold calculation.

[0020] S2.3 After the above-mentioned processing, the signal processing submodule calculates the response signal parameters and pulse signal level in real time, and packages and stores this signal segment in the buffer;

[0021] S2.4, The relevant calculated data is sent and displayed in real time via the network;

[0022] S2.5, the operator sets relevant parameters such as response mode, response trigger threshold, receive / transmit MGC and target speed simulation and response transmission delay based on the data displayed;

[0023] S2.6 After all parameters are set, the device enters the working mode. When the automatic response mode is selected, no manual intervention is required. The signal processing submodule automatically completes signal calculation and result output, and packages the received signal into a packet and sends it to the signal generation and transmission control submodule. After data transmission is completed, transmission is automatically started according to the set response strength parameters. When the programmable response mode is selected, no manual intervention is required. The signal processing submodule automatically completes signal calculation, result output, and response transmission start envelope, and sends them to the signal generation and transmission control submodule. The signal generation and transmission control submodule automatically generates the corresponding response signal based on the received calculated parameters, and then transmits it according to the transmission start envelope. When the manual response mode is selected, manual intervention is required. The operator must manually set the parameters and start the transmission to respond.

[0024] S3, Response signal generation and control, the response signal generation and control includes the following steps.

[0025] S3.1 When the automatic response mode is selected, no human intervention is required. The signal generation and transmission control submodule receives the entire raw signal data sent by the signal processing submodule in real time. After the data transmission is completed, the transmission is automatically started according to the set response strength parameters, and the data is packaged and sent to the high-precision DAC data buffer. When the programmable response mode is selected, no human intervention is required. The signal generation and transmission control submodule automatically generates the corresponding response signal according to the received and calculated parameters, and then automatically starts the transmission according to the set response strength parameters, and sends the data to the high-precision DAC data buffer. When the manual response mode is selected, human intervention is required. The signal generation and transmission control submodule generates the signal according to the manually set parameters, and then the transmission is started manually to respond, and the data is packaged and sent to the high-precision DAC data buffer. When the submarine radiated noise simulation mode is selected, the signal generation and transmission control submodule automatically generates a continuous corresponding submarine radiated noise simulation broadband noise signal according to the set parameters, and continuously packages the data and sends it to the high-precision DAC data buffer.

[0026] S3.2 converts the signal data from the high-precision DAC data buffer into analog data at a certain sampling rate, then performs low-pass filtering and isolation before sending the output to the power amplifier module to excite the transmitter transducer to complete the transmission of the response signal, and displays the transmission parameter status in real time.

[0027] Compared with the prior art, the present invention has the following advantages after adopting the above solution:

[0028] This innovative approach achieves a reliable 60km response in complex deep-sea environments under sea state 5 conditions. The front-end employs a high-order hardware filter, while the rear-end uses a high-order FIR digital filter to achieve high signal-to-noise ratio acquisition. It can perform real-time calculations of direct wave pulse levels, respond to any signal form within 20kHz, and provide adjustable error accuracy of less than 1dB within a 100dB–200dB range at the response source level. It also supports data storage and playback, and has the capability to detect the deployment depth of the receiving transducer (transmitting transducer). This breakthrough solves the problem that conventional special spheres and existing underwater acoustic transponders cannot reliably complete long-distance responses in complex environments, providing crucial technical support for the boundary performance verification of sonar equipment. Attached image description:

[0029] Figure 1 For the response system functional module diagram;

[0030] Figure 2 A flowchart of the response system workflow;

[0031] Figure 3 This is a structural outline diagram of the response system;

[0032] Figure 4 The system displays an operation interface to respond to user requests. Detailed implementation method:

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0034] Reference Figure 1 , 3 As shown, this embodiment of the invention comprises three parts: real-time acquisition of received data, real-time processing of received data, and generation and transmission control of response signals. Specifically, it includes a receiving transducer, a transmitting transducer, an integrated processing module, a power amplifier module, and a display and operation module. The receiving transducer is connected to the integrated processing module via a watertight cable, the transmitting transducer is connected to the power amplifier via a watertight cable, and the integrated processing module and the power amplifier module are connected via a signal connection.

[0035] The integrated processing module consists of a channel switching switch, a signal conditioning and acquisition module, a signal processing submodule, a signal generation and transmission control submodule, and a power supply module. After the acoustic signal enters the integrated processing module, it is first switched between single-channel and dual-channel parallel receiving transducers via the channel switching switch; then it enters the signal conditioning and acquisition module for signal conditioning and acquisition; and the signal processing submodule unpacks and processes the acquired data to calculate the response signal parameters and pulse signal level in real time, and packages and stores this signal segment in a buffer; finally, the signal generation and transmission control submodule generates the response signal. The power amplification module includes a transmission module and a secondary matching module, and the transmission module includes transmission module 1, transmission module 2, and transmission module 3.

[0036] Its workflow is as follows Figure 2 As shown, the specific steps include:

[0037] 1) Install the underwater receiving transducer and transmitting transducer onto the underwater structure frame, connect the corresponding transmitting and receiving watertight cables, check the insulation, and then lower them into the water to the designated depth by hydrological crane or manual deployment. Then, turn on the dry-end equipment (including: integrated processing module, power amplification module and display operation module).

[0038] 2) In Figure 4 The response system display interface shows that the received signal amplitude is normal by using the time domain waveform, frequency domain display, and energy time waterfall plot display area.

[0039] 3) The received signal can be programmed and MGC set in the receive and transmit parameter setting area until the signal amplitude is appropriate;

[0040] 4) After the received signal is normal, check whether the transmitted signal is normal. Switch to manual response mode, manually set the transmitted signal parameters through the receive and transmit parameter setting area, and then manually start the transmission. Observe whether the underwater transducer's transmission frequency and sound source level switch normally by switching the frequency, pulse width, and amplitude several times.

[0041] 5) After both the receiving and transmitting channels are normal, select the required response mode and start receiving the direct wave sent by the sonar in real time. In the first two cycles, observe the signal quality and amplitude to set appropriate trigger thresholds and related response parameters (such as delayed response, sound source level, frequency offset (only programmable response and manual response modes are supported) etc.).

[0042] 6) After setting the threshold and relevant response parameters, this response system will enter the automatic response / programmable response mode, which will respond in real time without human intervention and record the relevant calculation results and original array element signals in real time;

[0043] 7) When selecting the submarine radiated noise simulation mode, you can quickly enter the noise emission mode with one click after selecting the corresponding noise curve according to your needs. After the emission starts, the equipment enters the continuous noise emission mode. After switching modes, it will automatically exit the current working mode and enter the new working mode.

[0044] This embodiment constructs a deep-sea low-frequency high-power underwater acoustic response system, which realizes active signal response, real-time pulse signal level calculation, target distance / velocity / intensity simulation, submarine radiated noise simulation, real-time storage of calculation results and raw data, and real playback of the test process.

[0045] The above description only illustrates preferred embodiments of the present invention and should not be construed as limiting the scope of the claims. Any equivalent structural or procedural modifications made using this specification are included within the patent protection scope of the present invention.

Claims

1. A method for implementing a deep-sea low-frequency high-power underwater acoustic response system, characterized in that, The system comprises a receiving transducer, a transmitting transducer, a comprehensive processing module, a power amplification module and a display operation module, the receiving transducer is connected with the comprehensive processing module through a water-proof cable, the transmitting transducer is connected with the power amplification module through a water-proof cable, and the comprehensive processing module and the power amplification module are connected through a signal; The comprehensive processing module comprises a channel switching switch, a signal conditioning and collecting module, a signal processing submodule, a signal generation and transmission control submodule and a power module, after the acoustic signal enters the comprehensive processing module, the channel switching switch is used for parallel switching of single or double receiving transducers, then the signal conditioning and collecting module is used for signal conditioning and collecting, the signal processing submodule is used for unpacking and relevant processing of the collected data, the responding signal parameters and the pulse signal level are calculated in real time, the signal is packaged and stored in the cache, and then the signal generation and transmission control submodule is used for generating the responding signal; The implementation method comprises the following steps: S1, real-time acquisition of received data, comprising the following steps, S1.1, the receiving transducer is connected with the dry end comprehensive processing module through a water-proof connector and a water-proof cable; S1.2, after the acoustic signal enters the comprehensive processing module, the channel switching switch is used for parallel switching of single or double receiving transducers, a first-stage low-noise differential instrument amplifier of the signal conditioning and collecting module is used for first-stage amplification, and then a second-stage program-controlled amplifier is used for amplifying or reducing the signal; S1.3, after the output of the second-stage program-controlled amplifier, a high-order band-pass filter is used for filtering to obtain in-band signals and filter out out-of-band signals, and the signal-to-noise ratio is improved; S1.4, the in-band single-ended signal after filtering is sent to a high-precision differential ADC through a single-ended-to-differential low-noise instrument amplifier to further improve the anti-interference capability and perform analog-to-digital conversion; S1.5, the signal conditioning and collecting module packages the data after analog-to-digital conversion and sends the data to a network data group in real time; S2, real-time processing of received data, comprising the following steps, S2.1, the signal processing submodule receives the data collected in real time in the network data group and unpacks the data; S2.2, the acoustic data after unpacking is stored in an EMMC memory in real time and is subjected to high-order FIR filtering, windowing processing, FFT calculation, matched filtering, correlation matching calculation and threshold calculation synchronously; S2.3, the signal processing submodule calculates the responding signal parameters and the pulse signal level in real time, packages and stores the signal in the cache; S2.4, the data after correlation calculation is sent to a display in real time through a network; S2.5, an operator sets relevant parameters according to the data sent to the display. S2.6, after the completion of the relevant parameter setting, the device enters the working mode, when the automatic answering mode is selected, the signal processing submodule automatically completes the signal solution, result output, and sends the received whole section signal to the signal generation and transmission control submodule, and automatically starts the transmission according to the set answering strength parameter after the completion of data transmission; when the program-controlled answering mode is selected, the signal processing submodule automatically completes the signal solution, result output, and answering transmission start envelope and sends it to the signal generation and transmission control submodule, the signal generation and transmission control submodule automatically generates the corresponding answering signal according to the received solution parameters, and then performs transmission output according to the transmission start envelope; S3, answering signal generation and control, the answering signal generation and control comprises the following steps, S3.1, when the automatic answering mode is selected, the signal generation and transmission control submodule receives the whole section original signal data sent by the signal processing submodule in real time, and automatically starts the transmission according to the set answering strength parameter after the completion of data transmission, and sends the data to the high-precision DAC data buffer area, when the program-controlled answering mode is selected, the signal generation and transmission control submodule automatically generates the corresponding answering signal according to the received solution parameters, and then automatically starts the transmission according to the set answering strength parameter, and sends the data to the high-precision DAC data buffer area, when the manual answering mode is selected, the signal generation and transmission control submodule generates the signal according to the manual setting parameters, and then starts the transmission by manual to answer, and sends the data to the high-precision DAC data buffer area; when the submarine radiation noise simulation mode is selected, the signal generation and transmission control submodule automatically generates continuous corresponding submarine radiation noise simulation wideband noise signal according to the set parameters, and continuously sends the data to the high-precision DAC data buffer area; S3.2, the signal data in the high-precision DAC data buffer area is converted into digital signal according to a certain sampling rate, and then low-pass filtered and isolated output is sent to the power amplification module for transmission excitation, the driving transmission transducer outputs to complete the answering signal transmission, and the transmission parameter state is sent in real time.

2. The implementation method of the deep-sea low-frequency high-power underwater acoustic response system according to claim 1, characterized in that: The power amplification module comprises a transmission module and a secondary matching module.

3. The method for implementing the deep-sea low-frequency high-power underwater acoustic transponder system according to claim 2, characterized in that: The transmission module comprises a transmission module one, a transmission module two, and a transmission module three.

4. The method of implementing a deep-sea low-frequency high-power underwater acoustic transponder system according to claim 1, characterized in that, The relevant parameters in S2.5 include the answering mode, the answering trigger threshold, the receiving / transmission MGC, the target speed simulation, and the answering transmission delay.

5. The method of implementing a deep-sea low-frequency high-power underwater acoustic transponder system according to claim 1, characterized in that, In S2.6, when the manual answering mode is selected, the manual setting parameters and the starting transmission are used for answering.

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