Fish acoustic echo monitoring and collecting system and method

Abstract

The invention discloses a fish acoustic echo monitoring and collecting system and method, and relates to the field of fish acoustic echo characteristic research. In the system, an operation platform is provided with two operation skylights; the supporting slide rail is arranged on the operation platform; the net cage is located in a lower area corresponding to the first operation skylight; the first supporting rod and the second supporting rod are connected with the supporting sliding rail. The first and second supporting rods are correspondingly positioned in lower areas corresponding to the first and second operation skylights; the vertical camera and the transducer are arranged on the first supporting rod; the horizontal camera is arranged on the second supporting rod; the transducer transmits a sound wave signal to the net cage and receives a fish body echo signal; meanwhile, a vertical camera and a horizontal camera shoot in the vertical and horizontal directions of the net cage to obtain fish body space distribution; the fish body space distribution and the fish body echo signals after matched filtering processing are used as monitoring and collecting results, fine monitoring and collecting of fish acoustic echoes can be achieved, and the accuracy of fish acoustic echo collecting is improved.

Description

Technical Field

[0001] The present application relates to the field of research on fish acoustic echo characteristics, and in particular to a fish acoustic echo monitoring and acquisition system and method. Background Art

[0002] Fish acoustic echo characteristics are crucial for fishery research. Acoustic methods are a crucial means of remotely acquiring information about individual fish and fish schools, offering advantages over optical methods in applications such as turbid water and long-distance detection. Fish acoustic echoes can be used to obtain information such as target intensity, enabling research such as assessing fish growth status, estimating fish density, monitoring farmed fish, and identifying fish species. Therefore, acquiring and collecting fish acoustic echoes is a top priority.

[0003] Fish echo collection is mainly achieved in the following way: a signal processing host drives a transmitter and a power amplifier to transmit a sound wave signal of a specific frequency or type into the water through a sonar transducer, and the echo is received by the sonar transducer to reach the signal receiver and transmitted back to the signal processing host.

[0004] In related research on the acoustic echo characteristics of fish, the main methods used are rope tethering and cage methods. The rope tethering method uses methods such as anesthesia to control the fish within the sonar beam and obtain its acoustic characteristics; the cage method places the fish in a cage and randomly collects acoustic echoes. Because the physiological state of anesthetized fish is not exactly the same as that of live fish, the acoustic echoes obtained do not necessarily fully reflect their acoustic characteristics. The traditional cage method is too extensive, and the echoes of individual fish or fish schools are obtained randomly. In the development of algorithms for single fish echo recognition and single fish trajectory tracking, as well as in many applied research studies such as the feeding and movement behavior of farmed fish, the relevant echo collection experimental methods are unable to accurately obtain information on the spatiotemporal distribution of fish in the water, and cannot meet the needs of refined research. Summary of the Invention

[0005] The purpose of this application is to provide a fish acoustic echo monitoring and acquisition system and method, which can realize the refined monitoring and acquisition of fish acoustic echoes and improve the accuracy of fish acoustic echo acquisition.

[0006] To achieve the above objectives, this application provides the following solutions:

[0007] In a first aspect, the present application provides a fish acoustic echo monitoring and acquisition system, comprising: a signal processing host, an operating platform, a support rail, a first support rod, a vertical camera, a transducer, a cage, a second support rod, and a horizontal camera;

[0008] The operating platform is provided with a first operating skylight and a second operating skylight; the supporting slide rail is arranged on the operating platform; the supporting slide rail passes through the first operating skylight and the second operating skylight; the net cage is located in the lower area corresponding to the first operating skylight; the net cage is used to hold the fish body to be tested in the water; the first support rod and the second support rod are both connected to the supporting slide rail and are perpendicular to the supporting slide rail; the first support rod is located in the lower area corresponding to the first operating skylight; the second support rod is located in the lower area corresponding to the second operating skylight; the vertical camera and the transducer are arranged on the first support rod; the horizontal camera is arranged on the second support rod; the signal processing host is respectively connected to the vertical camera, the transducer and the horizontal camera;

[0009] The signal processing host is used to simultaneously transmit sonar echo acquisition instructions and image synchronization acquisition instructions; the transducer is used to transmit sound wave signals to the fish in the water to be tested according to the sonar echo acquisition instructions, and receive fish echo signals; the vertical camera is used to photograph the fish in the water to be tested from the vertical direction of the net cage according to the image synchronization acquisition instructions to obtain a first fish spatial distribution; the horizontal camera is used to photograph the fish in the water to be tested from the horizontal direction of the net cage according to the image synchronization acquisition instructions to obtain a second fish spatial distribution; the signal processing host is also used to perform matched filtering processing on the fish echo signals, and use the processed fish echo signals, the first fish spatial distribution and the second fish spatial distribution as monitoring and acquisition results of the fish in the water to be tested.

[0010] Optionally, the fish acoustic echo monitoring and acquisition system also includes: an electric movable slider; the first support rod is connected to the support slide rail through the electric movable slider; the electric movable slider is used to drive the first support rod to slide, so that the vertical camera and the transducer are located at the set positions in the cage.

[0011] Optionally, the fish acoustic echo monitoring and acquisition system further comprises: a transmission signal processing module;

[0012] The transmission signal processing module includes a digital-to-analog conversion module and a signal transmitter; the signal processing host is connected to the transducer through the digital-to-analog conversion module and the signal transmitter in sequence;

[0013] The digital-to-analog conversion module is used to convert the transmitted sonar echo acquisition instruction into a digital-to-analog conversion to obtain an analog signal;

[0014] The signal transmitter is used to amplify, low-pass filter and boost the analog signal in sequence to obtain a boosted signal, and send the boosted signal to the transducer; after receiving the boosted signal, the transducer transmits an acoustic wave signal to the fish body in the water to be tested.

[0015] Optionally, the fish acoustic echo monitoring and acquisition system further comprises: a receiving signal processing module;

[0016] The received signal processing module includes: a pre-filter, a signal receiver and an analog-to-digital conversion module; the transducer is connected to the signal processing host through the pre-filter, the signal receiver and the analog-to-digital conversion module in sequence;

[0017] The pre-filter is used to perform band-pass filtering on the fish body echo signal to obtain a filtered signal; the signal receiver is used to perform low-noise amplification and gain amplification on the filtered signal to obtain an amplified signal; the analog-to-digital conversion module is used to perform analog-to-digital conversion on the amplified signal to obtain a digital signal, and send the digital signal to a signal processing host; after receiving the digital signal, the signal processing host performs matched filtering processing to obtain a processed fish body echo signal.

[0018] Optionally, a cage fixing hole is provided on the operating platform; the cage fixing hole is used to fix the cage.

[0019] Optionally, the fish acoustic echo monitoring and acquisition system further includes: a limiting member; the limiting member is arranged at the bottom of the second support rod; the limiting member is used to limit the horizontal camera.

[0020] Optionally, a scale ruler is provided on a side of the cage close to the horizontal camera; the scale ruler is used to determine the height of the horizontal camera.

[0021] Optionally, the fish acoustic echo monitoring and acquisition system further comprises: a shielded cable;

[0022] The signal processing host is connected to the transducer via the shielded cable.

[0023] Optionally, the fish acoustic echo monitoring and acquisition system further comprises: a camera cable;

[0024] The signal processing host is connected to the vertical camera and the horizontal camera through the camera cable.

[0025] In a second aspect, the present application provides a method for monitoring and collecting fish acoustic echoes, comprising:

[0026] After receiving the sonar echo acquisition command, it transmits sound wave signals to the fish in the water to be tested and receives the echo signals from the fish;

[0027] After receiving the image synchronization acquisition instruction, the fish bodies in the water to be tested are photographed from the vertical direction of the net cage to obtain a first fish body spatial distribution; after receiving the image synchronization acquisition instruction, the fish bodies in the water to be tested are photographed from the horizontal direction of the net cage to obtain a second fish body spatial distribution; the sonar echo acquisition instruction and the image synchronization acquisition instruction are transmitted simultaneously;

[0028] Matched filtering is performed on the fish body echo signal, and the processed fish body echo signal, the first fish body spatial distribution, and the second fish body spatial distribution are used as monitoring and acquisition results of the fish body in the water to be tested.

[0029] According to the specific embodiments provided in this application, this application has the following technical effects:

[0030] The present application provides a fish acoustic echo monitoring and acquisition system and method, which discloses a transducer to realize the acquisition of fish body echo signals, and a horizontal camera and a vertical camera to realize the acquisition of the horizontal and vertical spatial distributions of the fish body. The present application realizes the refined monitoring and acquisition of fish acoustic echoes through the combination of sound and light, thereby improving the accuracy of fish acoustic echo acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 This is a structural diagram of a fish acoustic echo monitoring and acquisition system in one embodiment of the present application;

[0033] Figure 2 A schematic diagram of the fish acoustic echo monitoring and acquisition process provided in one embodiment of the present application;

[0034] Figure 3 A schematic diagram of the spatial distribution of a school of fish captured by a vertical camera according to an embodiment of the present application;

[0035] Figure 4 A schematic diagram of the spatial distribution of a school of fish captured by a horizontal camera according to an embodiment of the present application;

[0036] Figure 5 A schematic diagram of a fish school echo signal collected at a certain moment and a matched filtering peak detection result provided in an embodiment of the present application;

[0037] Figure 6 This is a schematic diagram of a fish school echo signal collected at another moment and a matched filtering peak detection result provided by an embodiment of the present application.

[0038] Figure numerals: limiter - 1, vertical camera - 2, second support rod - 3, operating platform bottom plate - 4, operating platform top plate - 5, first operating skylight - 6, cage fixing hole - 7, electric movable slider - 8, first support rod - 9, transducer - 10, supporting slide rail - 11, scale ruler - 12, cage - 13, pre-filter - 14, signal receiver - 15, horizontal camera placement window - 16, signal transmitter - 17, digital-to-analog conversion module - 18, signal processing host - 19, camera cable - 20, shielded cable - 21, horizontal camera - 22, second operating skylight - 23, analog-to-digital conversion module - 24. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0041] When collecting fish acoustic echoes in a laboratory setting, the combination of optical and acoustic systems can improve the ability to obtain information about fish schools. When collecting fish echoes, the acoustic system is responsible for emitting sound waves, receiving echoes, and processing signals, while the optical system can clearly record the temporal and spatial information during the experiment. Therefore, it is particularly important to build a fish echo fine-grained monitoring and collection system that combines sound and light.

[0042] In an exemplary embodiment, Figure 1 As shown, a fish acoustic echo monitoring and acquisition system is provided, including: a signal processing host 19, an operating platform, a supporting slide 11, a first support rod 9, a vertical camera 2, a transducer 10, a cage 13, a second support rod 3 and a horizontal camera 22.

[0043] A first operating skylight 6 and a second operating skylight 23 are opened on the operating platform; the supporting slide 11 is arranged on the operating platform; the supporting slide 11 passes through the first operating skylight 6 and the second operating skylight 23; the net cage 13 is located in the lower area corresponding to the first operating skylight 6; the net cage 13 is used to hold the fish body to be tested in the water, and the fish body to be tested in the water can be a single fish to be tested or a school of fish to be tested; the first support rod 9 and the second support rod 3 are both connected to the supporting slide 11, and are perpendicular to the supporting slide 11; the first support rod 9 is located in the lower area corresponding to the first operating skylight 6; the second support rod 3 is located in the lower area corresponding to the second operating skylight 23; the vertical camera 2 and the transducer 10 are arranged on the first support rod 9; the horizontal camera 22 is arranged on the second support rod 3; the signal processing host 19 is respectively connected to the vertical camera 2, the transducer 10 and the horizontal camera 22.

[0044] The signal processing host 19 is used to simultaneously transmit sonar echo acquisition instructions and image synchronization acquisition instructions; the transducer 10 is used to transmit sound wave signals to the fish body in the water to be tested according to the sonar echo acquisition instructions, and receive fish body echo signals; the vertical camera 2 is used to photograph the fish body in the water to be tested from the vertical direction of the net cage 13 according to the image synchronization acquisition instruction to obtain a first fish body spatial distribution; the horizontal camera 22 is used to photograph the fish body in the water to be tested from the horizontal direction of the net cage 13 according to the image synchronization acquisition instruction to obtain a second fish body spatial distribution; the signal processing host 19 is also used to perform matched filtering processing on the fish body echo signal, and use the processed fish body echo signal, the first fish body spatial distribution and the second fish body spatial distribution as the monitoring and acquisition results of the fish body in the water to be tested.

[0045] This embodiment achieves refined monitoring and collection of fish acoustic echoes, improving the accuracy of fish acoustic echo collection. The monitoring and collection results provide a basis for subsequent research such as fish growth status assessment, fish school density assessment, farmed fish monitoring, and fish species identification. Accurate monitoring and collection results also lead to more accurate subsequent assessment, monitoring, and identification results.

[0046] In another exemplary embodiment of the present application, the fish acoustic echo monitoring and acquisition system further includes: an electrically movable slider 8; the first support rod 9 is connected to the support rail 11 via the electrically movable slider 8; the electrically movable slider 8 is configured to drive the first support rod 9 to slide, so that the vertical camera 2 and the transducer 10 are positioned at predetermined positions within the net cage 13. The support rail 11 supports the electrically movable slider 8, and simultaneously drives the first support rod 9, the vertical camera 2, and the transducer 10 to slide on the electrically movable slider 8.

[0047] In another exemplary embodiment of the present application, the fish acoustic echo monitoring and acquisition system further includes: a transmitting signal processing module and a receiving signal processing module.

[0048] The transmission signal processing module includes a digital-to-analog conversion module 18 and a signal transmitter 17; the signal processing host 19 is connected to the transducer 10 via the digital-to-analog conversion module 18 and the signal transmitter 17. The digital-to-analog conversion module 18 is used to convert the transmission sonar echo acquisition instruction into a digital-to-analog conversion to obtain an analog signal. The signal transmitter 17 has a built-in power amplifier drive circuit for sequentially amplifying, low-pass filtering, and boosting the analog signal to increase the signal strength, thereby obtaining a boosted signal, and then sending the boosted signal to the transducer 10. After receiving the boosted signal, the transducer 10 transmits an acoustic wave signal to the underwater fish to be tested.

[0049] The received signal processing module includes a prefilter 14, a signal receiver 15, and an analog-to-digital conversion module 24. The transducer 10 is connected to the signal processing host 19 via the prefilter 14, the signal receiver 15, and the analog-to-digital conversion module 24. The prefilter 14 is used to perform bandpass filtering on the fish echo signal, removing out-of-band noise from the collected fish echo signal to obtain a filtered signal. The signal receiver 15 is used to perform low-noise amplification and gain amplification on the filtered signal to obtain an amplified signal. The analog-to-digital conversion module 24 is used to perform analog-to-digital conversion on the amplified signal to obtain a digital signal, which is then sent to the signal processing host 19. After receiving the digital signal, the signal processing host 19 performs matched filtering to obtain a processed fish echo signal. Matched filtering includes down-mixing, low-pass filtering, matched filtering, and data reporting.

[0050] The above-mentioned signal processing host 19 is mainly used for signal generation, signal processing, echo storage, export and other functions of the acoustic system (transducer 10, etc.), as well as video storage, export and device control functions of the optical system (camera, etc.).

[0051] In an exemplary embodiment, the transducer 10 is used to transmit sound waves and receive echoes from individual fish or schools of fish within the beam. The transducer 10 of this embodiment can employ transducers 10 with different signal frequencies and performance characteristics, depending on practical circumstances. For example, the present application can employ a wide-angle transducer 10 that expands the beam opening angle range by varying the array element combination, thereby expanding the beam range and improving acquisition efficiency.

[0052] In another exemplary embodiment of the present application, the vertical camera 2 and the horizontal camera 22 are both underwater cameras.

[0053] In another exemplary embodiment of the present application, a cage fixing hole 7 is provided on the operating platform; the cage fixing hole 7 is used to fix the cage 13 .

[0054] In another exemplary embodiment of the present application, the fish acoustic echo monitoring and acquisition system also includes: a limiter 1; the limiter 1 is arranged at the bottom of the second support rod 3; the second support rod 3 can allow the horizontal camera 22 to move up and down to a suitable depth, and the limiter 1 is used to limit the horizontal camera 22.

[0055] In another exemplary embodiment of the present application, a scale ruler 12 is provided on a side of the cage 13 close to the horizontal camera 22 ; the scale ruler 12 is used to determine the height of the horizontal camera 22 .

[0056] The scale 12 of this embodiment assists the horizontal camera 22 in observing the depth of the fish, the transducer 10 and the like in the water.

[0057] In another exemplary embodiment of the present application, the cage 13 is mainly used to confine the activity area of ​​the fish school in the test pool, and to simulate the activity state of fish schools of different densities by putting different numbers of fish into the test pool.

[0058] In another exemplary embodiment of the present application, the operating platform includes: an operating platform base plate 4 and an operating platform top plate 5. The operating platform base plate 4 is used to support the limiter 1, the vertical camera 2, the horizontal camera 22, the second support rod 3, the first support rod 9, the transducer 10, the support rail 11, and the cage 13. The operating platform top plate 5 serves as the operating platform for the tester.

[0059] In another exemplary embodiment of the present application, a horizontal camera placement window 16 is opened on the operating platform bottom plate 4 to facilitate the placement of the horizontal camera 22.

[0060] In another exemplary embodiment of the present application, the fish acoustic echo monitoring and acquisition system further includes a shielded cable 21 and a camera cable 20. The signal processing host 19 is connected to the transducer 10 via the shielded cable 21; and the signal processing host 19 is connected to the vertical camera 2 and the horizontal camera 22 via the camera cable 20.

[0061] Specifically, the signal processing host 19 is connected to the digital-to-analog conversion module 18 and the signal transmitter 17 in sequence. The signal transmitter 17 is connected to the transducer 10 via a shielded cable 21. The shielded cable 21 enables analog signal transmission between the transducer 10 and the signal transmitter 17. The transducer 10 is connected to the prefilter 14 via the shielded cable 21. The shielded cable 21 enables analog signal transmission between the transducer 10 and the prefilter 14.

[0062] The following combination Figure 2 , a specific implementation process of the above-mentioned fish acoustic echo monitoring system in practical applications is introduced.

[0063] First, based on the experimental task and echo acquisition requirements, determine parameters such as the size of the cage 13 and the number of fish. Select a transducer 10 with the appropriate frequency based on the test requirements. After the system is set up, use the motor control system to control the transducer 10, vertical camera 2, and horizontal camera 22 to the appropriate positions. After position setting and calibration, prepare for echo acquisition.

[0064] The signal processing host 19 issues sonar echo acquisition commands and synchronized image acquisition commands to simultaneously capture echoes and video images of fish within the beam range. While obtaining the acoustic echo data of the fish school, the spatial position of the fish school in two dimensions is simultaneously determined. Based on the scale on the cage 13 and the depth calibration of the camera's motor control system, the real-time spatial position of each fish within the school is obtained, providing reference data for sonar echo analysis. The horizontal camera 22 is used to unify the time scale of the fish school's acoustic echo signal and the vertical distance of the fish within the school relative to the transducer 10. The vertical camera 2 simultaneously observes the number and spatial distribution of fish within the echo range within the school.

[0065] Afterwards, the collected fish school echo signals are subjected to data processing such as matched filtering in the signal processing host 19 to obtain high-resolution fish school echo information.

[0066] When using this embodiment, first, build Figure 1 The experimental acquisition system framework shown in the figure is prepared and connected to the experimental instruments at the same time. 10 crucian carp (this experimental system is not limited to a certain type of fish) are placed in the cage 13 of the pool (in this example, the cage 13 has a diameter of 2 meters and a depth of 6 meters. The application of this experimental system is not limited to this fixed size of cage) and the fish swim freely in the cage 13. At this time, adjust the transducer 10 to 1 meter below the water surface and adjust the vertical camera 2 to 2 meters below the water surface. Use the motor control system to move the electric moving slider 8 to drive the transducer 10 to the center of the cage 13, and at the same time control the horizontal camera to go 3 meters deep into the water.

[0067] After position setting and calibration, preparations for echo acquisition are made. The transducer 10 (transducer 10 transmits a signal at a frequency of 200 kHz) and the horizontal camera 22 and vertical camera 2 are simultaneously turned on to collect sonar echoes and images of the fish school.

[0068] Based on the above fish acoustic echo monitoring system, the spatial distribution image of the fish school captured by the vertical camera 2, that is, the spatial distribution image of the first fish body, is as follows: Figure 3 As shown, Figure 3 Part (a) of Figure 3 Part (b) shows the spatial distribution of fish at different times. The spatial distribution image of the fish school captured by the horizontal camera 22, that is, the second spatial distribution image of the fish body, is shown in FIG. Figure 4 As shown, Figure 4 Part (a) of Figure 4 Part (b) shows the spatial distribution of fish bodies at different times. Figure 3 Part (a) of Figure 4 Part (a) is the same time, Figure 3 Part (b) of Figure 4 Part (b) is the same time.

[0069] It can be seen that through two-dimensional image acquisition, the spatial distribution of the fish body in the direction perpendicular to the transducer 10 can be clearly distinguished, which is crucial for collecting echo signals that meet the needs of experimental research.

[0070] Figure 5 and Figure 6 Fish school echo signals collected at different times and matched filtering peak detection results. Figure 5 Part (a) is related to Figure 3 The fish school echo signals collected by the camera in part (a) at the same time, Figure 5 Part (b) is for Figure 5 The matched filtering peak detection result is obtained after the fish school echo signal collected in part (a) is processed by matched filtering. Figure 6 Part (a) is related to Figure 3 The fish school echo signals collected by the camera in part (b) at the same time, Figure 6 Part (b) is for Figure 6 The peak detection result of the matched filter is obtained after the fish school echo signal collected in part (a) of Figure 1 is processed by matched filtering. Through the signal echo and matched filtering, we can see that the distribution of the fish school is consistent with the distribution of the echo signal in the time domain.

[0071] The fish acoustic echo monitoring system of this embodiment realizes refined monitoring and collection of fish acoustic echoes based on the combination of sound and light, and can be used for refined collection of fish school or single fish echoes in scientific research such as fish acoustic echo characteristics research and fish echo recognition algorithm research.

[0072] Based on the same inventive concept, the present application also provides a method for fish acoustic echo monitoring implemented using the aforementioned fish acoustic echo monitoring system. The solution provided by this method is similar to the solution described in the aforementioned system. Therefore, the specific limitations of one or more of the following embodiments of the fish acoustic echo monitoring method can be found in the above-mentioned limitations on the fish acoustic echo monitoring system, and will not be further elaborated here.

[0073] In an exemplary embodiment, a fish acoustic echo monitoring method is provided, comprising:

[0074] (1) After receiving the sonar echo acquisition command, the system transmits a sound wave signal to the fish in the water to be tested and receives the echo signal from the fish.

[0075] (2) When the image synchronization acquisition instruction is received, the fish bodies in the water to be tested are photographed from the vertical direction of the cage 13 to obtain a first fish body spatial distribution; when the image synchronization acquisition instruction is received, the fish bodies in the water to be tested are photographed from the horizontal direction of the cage 13 to obtain a second fish body spatial distribution; the sonar echo acquisition instruction and the image synchronization acquisition instruction are transmitted simultaneously.

[0076] (3) performing matched filtering processing on the fish body echo signal, and using the processed fish body echo signal, the first fish body spatial distribution, and the second fish body spatial distribution as monitoring and acquisition results of the fish body in the water to be tested.

[0077] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core concept of this application. At the same time, for those skilled in the art, based on the concept of this application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A fish acoustic echo monitoring and collection system, characterized in that: The fish acoustic echo monitoring and acquisition system comprises: a signal processing host, an operating platform, a supporting slide rail, a first supporting rod, a vertical camera, a transducer, a net cage, a second supporting rod and a horizontal camera; The operating platform is provided with a first operating skylight and a second operating skylight; the supporting rail is arranged on the operating platform; the supporting rail passes through the first operating skylight and the second operating skylight; the net cage is located in the lower area corresponding to the first operating skylight; the net cage is used to hold the fish body to be tested in the water; the first support rod and the second support rod are both connected to the supporting rail and are perpendicular to the supporting rail; the first support rod is located in the lower area corresponding to the first operating skylight; the second support rod is located in the lower area corresponding to the second operating skylight; the vertical camera and the transducer are arranged on the first support rod; the horizontal camera is arranged on the second support rod; the signal processing host is respectively connected to the vertical camera, the transducer and the horizontal camera; The signal processing host is used to simultaneously transmit a sonar echo acquisition instruction and an image synchronization acquisition instruction; the transducer is used to transmit a sound wave signal to the fish body in the water to be tested according to the sonar echo acquisition instruction, and receive the fish body echo signal; the vertical camera is used to photograph the fish body in the water to be tested from the vertical direction of the net cage according to the image synchronization acquisition instruction to obtain a first fish body spatial distribution; the horizontal camera is used to photograph the fish body in the water to be tested from the horizontal direction of the net cage according to the image synchronization acquisition instruction to obtain a second fish body spatial distribution; the signal processing host is also used to perform matched filtering processing on the fish body echo signal, and use the processed fish body echo signal, the first fish body spatial distribution and the second fish body spatial distribution as the monitoring and acquisition results of the fish body in the water to be tested.

2. The fish acoustic echo monitoring and collection system according to claim 1, characterized in that: The fish acoustic echo monitoring and collection system also includes: an electric movable slider; the first support rod is connected to the support slide rail through the electric movable slider; the electric movable slider is used to drive the first support rod to slide, so that the vertical camera and the transducer are located at the set positions in the cage.

3. The fish acoustic echo monitoring and collection system according to claim 1, characterized in that: The fish acoustic echo monitoring and acquisition system further comprises: a transmission signal processing module; The transmission signal processing module includes a digital-to-analog conversion module and a signal transmitter; the signal processing host is connected to the transducer through the digital-to-analog conversion module and the signal transmitter in sequence; The digital-to-analog conversion module is used to convert the transmission sonar echo collection instruction into a digital-to-analog conversion to obtain an analog signal; The signal transmitter is used to amplify, low-pass filter and boost the analog signal in sequence to obtain a boosted signal, and send the boosted signal to the transducer; after receiving the boosted signal, the transducer transmits a sound wave signal to the fish body in the water to be tested.

4. The fish acoustic echo monitoring and collection system according to claim 1, characterized in that: The fish acoustic echo monitoring and acquisition system further comprises: a receiving signal processing module; The received signal processing module includes: a pre-filter, a signal receiver and an analog-to-digital conversion module; the transducer is connected to the signal processing host through the pre-filter, the signal receiver and the analog-to-digital conversion module in sequence; The pre-filter is used to perform band-pass filtering on the fish echo signal to obtain a filtered signal; the signal receiver is used to perform low-noise amplification and gain amplification on the filtered signal to obtain an amplified signal; the analog-to-digital conversion module is used to perform analog-to-digital conversion on the amplified signal to obtain a digital signal, and send the digital signal to a signal processing host; after receiving the digital signal, the signal processing host performs matched filtering processing to obtain a processed fish echo signal.

5. The fish acoustic echo monitoring and collection system according to claim 1, characterized in that: The operating platform is provided with a net cage fixing hole, and the net cage fixing hole is used to fix the net cage.

6. The fish acoustic echo monitoring and collection system according to claim 1, characterized in that: The fish acoustic echo monitoring and collection system also includes: a limiting member; the limiting member is arranged at the bottom of the second support rod; the limiting member is used to limit the horizontal camera.

7. The fish acoustic echo monitoring and collection system according to claim 1, characterized in that: A scale ruler is arranged on one side of the net box close to the horizontal camera; the scale ruler is used to determine the height of the horizontal camera.

8. The fish acoustic echo monitoring and collection system according to claim 1, characterized in that: The fish acoustic echo monitoring and collection system further comprises: a shielded cable; The signal processing host is connected to the transducer via the shielded cable.

9. The fish acoustic echo monitoring and collection system according to claim 1, characterized in that: The fish acoustic echo monitoring and acquisition system further comprises: a camera cable; The signal processing host is connected to the vertical camera and the horizontal camera through the camera cable.

10. A method for monitoring and collecting fish acoustic echoes, characterized in that: The fish acoustic echo monitoring and collection method comprises: After receiving the sonar echo collection command, it transmits the sound wave signal to the fish body in the water to be tested, and receives the echo signal of the fish body; When receiving the image synchronization acquisition instruction, the fish bodies in the water to be tested are photographed from the vertical direction of the net cage to obtain a first fish body spatial distribution; when receiving the image synchronization acquisition instruction, the fish bodies in the water to be tested are photographed from the horizontal direction of the net cage to obtain a second fish body spatial distribution; the sonar echo acquisition instruction and the image synchronization acquisition instruction are emitted simultaneously; The fish body echo signal is subjected to matched filtering processing, and the processed fish body echo signal, the first fish body spatial distribution and the second fish body spatial distribution are used as monitoring and acquisition results of the fish body in the water to be tested.

Images