CN114397007A - Underwater multi-channel distortion-free data acquisition and storage system under high sampling rate - Google Patents
Underwater multi-channel distortion-free data acquisition and storage system under high sampling rate Download PDFInfo
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- G—PHYSICS
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- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
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- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
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- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0655—Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
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Abstract
The invention discloses an underwater multichannel undistorted data acquisition and storage system under high sampling rate, which comprises a hydrophone, an underwater carrier, a control circuit, a power supply and a main controller, wherein the hydrophone is connected with the control circuit; the hydrophone is arranged at the bottom of the underwater carrier; the control circuit is arranged in the underwater carrier; the power supply supplies power to the hydrophone, the underwater carrier and the control circuit, the main controller is connected with the control circuit, the control circuit comprises a program control gain amplification circuit, a low-pass filter circuit, an A/D conversion module, a micro control unit, a data storage module, an RTC module and a state indication module, the acquisition efficiency is higher, and a foundation is provided for subsequent data processing and analysis. Under the high sampling rate, adopt two buffer structure, can practice thrift buffer space and improve data storage rate simultaneously to once save when data accumulation is suitable, improved storage efficiency, also can avoid losing a large amount of original data when unexpected circumstances such as sudden power failure take place.
Description
Technical Field
The invention relates to the technical field of underwater acoustic data acquisition and storage, in particular to an underwater multichannel distortion-free data acquisition and storage system under high sampling rate.
Background
Underwater acoustic data acquisition is one of the important functions of various underwater working platforms. Underwater work platforms usually work in unmanned environments for a long time, which requires that the underwater acoustic data acquisition system itself must have extremely high stability and reliability. Besides, different application scenarios also have higher requirements on the aspects of the overall size, the synchronism, the sampling precision, the power consumption and the like of the system, which needs to consider the universality and the expansibility of the system during design. Meanwhile, the data storage speed is also very important, and the storage speed must be matched with the acquisition speed to ensure the integrity of the received data.
Through analysis, the existing ocean acoustic data acquisition system mainly has the following defects:
(1) and the number of sampling channels is small. Because the writing speed of the existing storage medium is unstable, the longest time for writing data needs to be considered, so that the existing underwater acoustic data acquisition and storage system is generally low in storage speed and cannot realize a multichannel synchronous acquisition and storage function.
(2) The sampling rate is low. The low sampling rate has higher tolerance to the storage speed and the system stability to a certain extent, and the problem of data loss easily occurs if the acquisition rate is increased.
The power consumption is high. Because the underwater equipment cannot supply power to the underwater equipment in a working state, the underwater equipment cannot continuously work underwater for a long time if the power consumption of the system is large.
Disclosure of Invention
Therefore, the invention aims to overcome the defects of the existing acquisition and storage functions and provide the underwater multi-channel distortion-free data acquisition and storage system under the high sampling rate, so that the storage efficiency can be improved, the loss of original data is avoided, the power consumption is reduced, and the continuous working time is prolonged.
In order to solve the technical problems, the technical scheme of the invention is as follows:
an underwater multichannel distortion-free data acquisition and storage system under high sampling rate comprises a hydrophone, an underwater carrier, a control circuit, a power supply and a main controller, wherein the hydrophone is connected with the control circuit; the hydrophone is arranged at the bottom of the underwater carrier; the control circuit is arranged in the underwater carrier; the power supply supplies power to the hydrophone, the underwater carrier and the control circuit, the main controller is connected with the control circuit and used for achieving information interaction, the control circuit comprises a program control gain amplification circuit, a low-pass filter circuit, an analog-to-digital (A/D) conversion module, a micro control unit, a data storage module, a Real Time Clock (RTC) module and a state indication module, the program control gain amplification circuit is connected with the main controller, the program control gain amplification circuit, the low-pass filter circuit and the A/D conversion module are sequentially connected and output to the micro control unit, a clock signal of the RTC module is output to the micro control unit, the data storage module is connected with the micro control unit and used for reading and writing data, and the state indication module is connected with the micro control unit and used for judging whether the storage state is normal or not.
Preferably, the hydrophone is of a piezoelectric circular tube structure, one end of the hydrophone is connected with the input end of the control circuit through a wire harness, a sealing ring is arranged at the joint of the wire harness and the underwater carrier, and the hydrophone is fixed on the underwater carrier outer wall.
Preferably, the control circuit has a sampling rate of 75 ksps.
Preferably, the programmable gain amplifying circuit adjusts the gain to be 0-64V/V, steps by 4dB, and comprises a programmable gain amplifying chip LTC 6911-2.
Preferably, the underwater vehicle is of a sealed cylindrical structure, horizontal wings are symmetrically arranged on two sides of the underwater vehicle, an antenna is arranged on the underwater vehicle, and a sensor module, a buoyancy driving module and a posture adjusting module are further arranged in the underwater vehicle.
Preferably, the low-pass filter circuit has a circuit form as follows:
cutoff frequency calculation formula:
wherein, CcmAnd CDIFFIs the size of the capacitor.
Preferably, the a/D conversion module comprises an ADS1274 chip, the a/D conversion module is connected to an external interrupt pin of the micro control unit to trigger SPI transmission, the a/D conversion module is 24-bit 4-channel synchronous sampling, the maximum sampling rate of the a/D conversion module is 144kSPS, the a/D conversion module is connected with the micro control unit through an SPI interface, and DRDY is output by the a/D conversion module.
Preferably, the data storage module comprises 2 SD cards, and the data storage module is connected to an SDIO bus of the micro control unit through a three-state bus switch.
Preferably, the RTC module is connected to the micro control unit via an I2C interface.
Preferably, the power supply provides a 5V analog power supply for the A/D conversion module; the power supply provides a 1.8V digital power supply for the A/D conversion module; the power supply provides a 2.5V reference power supply for the A/D conversion module; the 3.3V power supply is respectively used for the IO power supply of the micro control unit and the A/D conversion module and the RTC module.
The invention has the following characteristics and beneficial effects:
(1) the invention can simultaneously open 8 channels, can simultaneously receive more data information, has higher acquisition efficiency and provides a basis for subsequent data processing and analysis.
(2) Under the high sampling rate, adopt two buffer structure, can practice thrift buffer space and improve data storage rate simultaneously to once save when data accumulation is suitable, improved storage efficiency, also can avoid losing a large amount of original data when unexpected circumstances such as sudden power failure take place.
(3) The invention has low power consumption and can support the continuous work of the underwater glider for a long time.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention
Fig. 2 is a general block diagram of a control circuit of an embodiment of the present invention.
Fig. 3 is a schematic diagram of the low pass filter circuit of fig. 2.
Fig. 4 is a schematic diagram of the a/D conversion module of fig. 2.
Fig. 5 is a flow chart of the double-cache structure of fig. 2.
Fig. 6 is a schematic diagram of the power supply topology of fig. 2.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention discloses an underwater multichannel undistorted data acquisition and storage system under high sampling rate, as shown in fig. 1 and fig. 2, comprising a hydrophone 1, an underwater carrier 2, a control circuit 3, a power supply 4 and a main controller 21, wherein the hydrophone 1 is connected with the control circuit 3; the hydrophone 1 is arranged at the bottom of the underwater carrier 2; the control circuit 3 is arranged in the underwater carrier 2; the power supply 4 supplies power to the hydrophone 1, the underwater carrier 2 and the control circuit 3, the main controller is connected with the control circuit 3, for realizing information interaction, the control circuit 3 comprises a programmable gain amplifying circuit 31, a low-pass filter circuit 32, an A/D conversion module 33, a micro-control unit 34, a data storage module 35, an RTC module 36 and a status indication module 37, the program control gain amplifying circuit 31 is connected with the main controller 21, the program control gain amplifying circuit 31, the low pass filter circuit 32 and the A/D conversion module 33 are connected in sequence, and outputs the clock signal to the micro control unit 34, the clock signal of the RTC module 36 outputs the clock signal to the micro control unit 34, the data storage module 35 is connected to the micro control unit 34, the state indicating module 37 is connected to the micro control unit 34 and is configured to determine whether the storage state is normal. Wherein the sampling rate of the control circuit 3 is 75 ksps.
It can be understood that the hydrophone 1 converts the received acoustic signal into an electric signal and outputs the electric signal to the control circuit 3, the SPI communication is used for data acquisition, the RTC module is used for obtaining real-time, the acquired data and the current time are stored in the SD card through DMA transmission and a double-cache structure according to a data storage protocol, each group of data storage succeeds, and the indicator light flashes once. The power supply 4 supplies power to the hydrophone 1, the underwater glider 2 and the control circuit 3.
Specifically, the hydrophone 1 is of a piezoelectric circular tube structure, one end of the hydrophone 1 is connected with the input end of the control circuit 3 through a wire harness, a sealing ring is arranged at the joint of the wire harness and the underwater carrier 2, the hydrophone 1 is fixed on the outer wall of the underwater carrier 2 and used for receiving an acoustic signal in water and converting the acoustic signal into an electric signal, the total length of the hydrophone is 91mm, the length of a black rubber part is 52.5mm, the diameter of the black rubber part is 22.6mm, the length of a lower end metal part is 38.5mm, the diameter of the black rubber part is 16.6mm, and the total weight of the hydrophone is 100g (+/-5 g).
It can be understood that by arranging the sealing ring, water is prevented from permeating into the underwater carrier from the connection part to damage the control circuit 3.
The invention further provides that the underwater carrier 2 is of a sealed cylindrical structure, horizontal wings 21 are symmetrically arranged on two sides of the underwater carrier 2, an antenna 22 is arranged on the underwater carrier 2, and a sensor module, a buoyancy driving module and a posture adjusting module are further arranged in the underwater carrier 2.
It can be understood, through setting up the sensor module, buoyancy drive module, gesture adjusting module, thereby through the depth and the gesture current situation of sensor module underwater carrier 2, and then adjust the underwater position of underwater carrier 2 through buoyancy drive module, and adjust the gesture of underwater carrier through gesture adjusting module, guarantee underwater carrier 2 in the initial condition of laying the aquatic also be the surface of water waiting stage from lacking, the carrier is not the level floats on the surface of water in this stage, but put the focus in the front end of fuselage through the adjustment of gesture, in order to guarantee that the antenna of afterbody can spill the surface of water, improve satellite communication's signal intensity as far as possible under the state of surface of water waiting like this.
Specifically, the control circuit 3 mainly includes a programmable gain amplifying circuit 31, a low-pass filter circuit 32, an a/D conversion module 33, a micro control unit 34, a data storage module 35, an RTC module 36, and a status indication module 37. The programmable gain amplifying circuit 31 realizes the gain of 0-64V/V, adopts the programmable gain amplification and steps by 4 dB. The programmable gain amplification chip LTC6911-2 is a two-channel 3-bit digital gain controller and supports three power supply modes of 3V, 5V and +/-5V. In the design, two channels are respectively used as a positive signal and a negative signal of a differential signal, and due to the adoption of a single power supply mode of 5V, 2.5V bias voltage at an input end can be provided by external 5V power supply voltage division. The low-pass filter circuit 32 is used for performing anti-aliasing before a signal enters the AD, and filtering out high-frequency components with a sampling frequency higher than 1/2, and the circuit form is as follows:
cutoff frequency calculation formula:
wherein, CcmAnd CDIFFIs the size of the capacitor in fig. 3.
Specifically, as shown in fig. 4, the a/D conversion module 33 adopts an ADS1274 chip, which is a 24-bit 4-channel synchronous sampling ADC, and the maximum sampling rate can reach 144kSPS in a High Speed mode. The interface between the ADC and the micro control unit 34(MCU) is an SPI interface, where DRDY is output by the ADC, connected to an external interrupt pin of the MCU, and triggers SPI transmission.
Specifically, as shown in fig. 5, the data storage module 35 is composed of 2 SD cards, and is connected to the SDIO bus of the MCU through a tri-state bus switch to implement time-sharing operation of the two SD cards, considering that the 2 SD cards do not need to be accessed simultaneously, a power supply is designed for each SD card to be turned off, and the SD card that does not need to be accessed currently can be turned off when the system is in operation, so as to save power consumption. The data storage module 35 transmits the acquired data through DMA while adopting a double-cache structure, so that parallel execution of acquisition and storage is realized and the integrity of the data is ensured. According to the storage mode of the FATFS file system of the SD card, when the data is accumulated to 768KB, the data is stored, the consistency of the actual file system on the disk and the content in the cache is ensured by using fsync, and the modified block is ensured to be written into the disk immediately. The data accumulation is to improve the storage efficiency, and balance the storage speed and prevent the data loss in an unexpected situation.
The RTC module adopts PCF2129AT, and a +/-3 ppm high-precision oscillation source is arranged in the chip. The RTC is connected to the MCU through an I2C interface, and a miniature rechargeable battery is adopted as the RTC standby power supply.
It can be understood that the status indication module is an LED, and when a group of data is stored normally and successfully, the indicator light flashes once, otherwise, if the data is placed in a long on or long off status, it indicates that a certain error occurs in the program, and a corresponding measure should be taken in time.
Specifically, as shown in fig. 6, the external power supply of the power supply 4 is 24V, and converts the required voltage through the DCDC and LDO chips in the power supply topology structure diagram, wherein the 5V power supply is mainly used for the analog power supply of the ADC chip, the 1.8V power supply is mainly used for the digital power supply of the ADC chip, the 2.5V power supply is mainly used for the reference power supply of the ADC chip, and the 3.3V power supply is respectively used for the IO power supply and the RTC chip of the MCU and the ADC chip.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments, including the components, without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (10)
1. An underwater multichannel distortion-free data acquisition and storage system under high sampling rate is characterized by comprising a hydrophone (1), an underwater carrier (2), a control circuit (3), a power supply (4) and a main controller (21), wherein the hydrophone (1) is connected with the control circuit (3); the hydrophone (1) is arranged at the bottom of the underwater carrier (2); the control circuit (3) is arranged in the underwater carrier (2); the power supply (4) supplies power to the hydrophone (1), the underwater carrier (2) and the control circuit (3), the main controller is connected with the control circuit (3) and used for realizing information interaction, the control circuit (3) comprises a program control gain amplification circuit (31), a low-pass filter circuit (32), an A/D conversion module (33), a micro control unit (34), a data storage module (35), an RTC module (36) and a state indication module (37), the program control gain amplification circuit (31) is connected with the main controller (21), the program control gain amplification circuit (31), the low-pass filter circuit (32) and the A/D conversion module (33) are sequentially connected and output to the micro control unit (34), a clock signal of the RTC module (36) is output to the micro control unit (34), the data storage module (35) is connected with the micro control unit (34), the state indicating module (37) is used for reading and writing data and is connected with the micro control unit (34) and used for judging whether the storage state is normal or not.
2. The underwater multichannel undistorted data acquisition and storage system under high sampling rate according to claim 1, characterized in that the hydrophone (1) is of a piezoelectric circular tube structure, one end of the hydrophone (1) is connected with the input end of the control circuit (3) through a wire harness, a sealing ring is arranged at the connection position of the wire harness and the underwater carrier (2), and the hydrophone (1) is fixed on the outer wall of the underwater carrier (2).
3. The underwater multichannel distortion-free data acquisition and storage system at high sampling rate of claim 1, characterized in that the sampling rate of the control circuit (3) is 75 ksps.
4. The underwater multichannel distortion-free data acquisition and storage system at high sampling rate of claim 1, wherein the programmable gain amplification circuit (31) adjusts the gain to 0-64V/V, step by 4dB, which includes a programmable gain amplification chip LTC 6911-2.
5. The underwater multichannel undistorted data acquisition and storage system under high sampling rate according to claim 1, characterized in that the underwater vehicle (2) is a sealed cylindrical structure, horizontal wings (21) are arranged on two sides of the underwater vehicle in a symmetrical structure, an antenna (22) is arranged on the underwater vehicle (2), and a sensor module, a buoyancy driving module and a posture adjusting module are further arranged in the underwater vehicle (2).
6. The underwater multichannel distortion-free data acquisition and storage system at high sampling rate of claim 1, wherein the low pass filter circuit (32) is of the circuit form:
cutoff frequency calculation formula:
wherein, CcmAnd CDIFFIs the size of the capacitor.
7. The underwater multichannel distortion-free data acquisition and storage system at high sampling rate of claim 1, wherein the a/D conversion module (33) comprises an ADS1274 chip, the a/D conversion module (33) is connected to an external interrupt pin of the micro control unit (34) to trigger SPI transmission, the a/D conversion module (33) is 24-bit 4-channel synchronous sampling, the a/D conversion module (33) has a maximum sampling rate of 144kSPS, the a/D conversion module (33) is connected with the micro control unit (34) through an SPI interface, and DRDY is output by the a/D conversion module (33).
8. The underwater multichannel distortion-free data acquisition and storage system at high sampling rate of claim 1, characterized in that the data storage module (35) comprises 2 SD cards, and the data storage module (35) is connected to the SDIO bus of the micro control unit (34) through a three-state bus switch.
9. The underwater multichannel distortion-free data acquisition and storage system at high sampling rate of claim 1, characterized in that the RTC module (36) employs PCF2129AT, the chip is built-in with ± 3ppm high precision oscillation source, and the RTC module (36) is connected to the micro control unit (34) through I2C interface.
10. The underwater multichannel distortion-free data acquisition and storage system at high sampling rate of claim 1, wherein the power supply (4) provides 5V analog power for the a/D conversion module (33); the power supply (4) provides a 1.8V digital power supply for the A/D conversion module (33); the power supply (4) provides a 2.5V reference power supply for the A/D conversion module (33); the 3.3V power supply is respectively used for an IO power supply of the micro control unit (34) and the A/D conversion module (33) and the RTC module (36).
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| CN115051757A (en) * | 2022-06-08 | 2022-09-13 | 大连理工大学 | Modularized underwater wireless optical communication device and communication method |
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| CN113093107A (en) * | 2021-04-07 | 2021-07-09 | 嘉兴中科声学科技有限公司 | Underwater sound signal acquisition and transmission system and method |
| CN113485180A (en) * | 2021-06-29 | 2021-10-08 | 中国人民解放军91550部队 | Self-contained multi-channel transient noise measurement system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115051757A (en) * | 2022-06-08 | 2022-09-13 | 大连理工大学 | Modularized underwater wireless optical communication device and communication method |
| CN115051757B (en) * | 2022-06-08 | 2023-12-22 | 大连理工大学 | Modularized underwater wireless optical communication device and communication method |
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