• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present disclosure discloses an on-site quick calibration system for a fish finder and a method thereof, which solve the defects of time-consuming of underwater positioning 5 of a standard sphere, low calibration accuracy, high cost and beam-limited condition during the marine living resources acoustic survey using eXisting ultrasonic fish finder. The gist of the technical scheme comprises a fish finder transducer, a standard sphere, two acoustic beacons respectively fixedly connected above and below the standard sphere, three hydrophones, a central console, and three take-up and pay-off components. 10 According to the on-site quick calibration system for a fish finder and the method thereof, the underwater positioning and automatic position control of the standard sphere for calibration of a fish finder can be quickly realized, and the efficiency and the accuracy of on-site acoustic parameter calibration of the fish finder can be improved.
    公开号:NL2027867A
    申请号:NL2027867
    申请日:2021-03-30
    公开日:2021-06-17
    发明作者:Tong Jianfeng；Zhang Jin；Tian Siquan；Wang Xuefang
    申请人:Univ Shanghai Ocean；
    IPC主号:
    专利说明:

    ON-SITE QUICK CALIBRATION SYSTEM FOR FISH FINDER ANDMETHOD THEREOF
    TECHNICAL FIELD The present disclosure relates to the field of marine fishery resources survey, in particular to an on-site quick calibration system for a fish finder and a method thereof.
    BACKGROUND As the main instrument for acoustic assessment of fishery resources, an ultrasonic fish finder has a principle based on the corresponding relationship between the intensity of echo of a detection target and the size and/or number of targets. Simply speaking, the larger the target, the stronger the echo, and the more the number, the stronger the echo. When using a fish finder to quantitatively assess fishery resources, the fish finder system must be calibrated, including the echo intensity and the underwater three-dimensional position of the target. The existing calibration method for a fish finder system is to use a standard sphere with known echo intensity at the operating frequency of a fish finder as a reference for system calibration. Because of the narrow beam of a fish finder and the small diameter of a standard sphere, it is difficult to find the echo of the standard sphere through the echo display screen of the fish finder. For single beam system, it is impossible to know the deviation direction of the standard sphere with respect to the acoustic axis. Even if the standard sphere echo is found on the fish finder screen, it is impossible to know how to control the standard sphere to make it close to the center of the acoustic axis in the next step. Because it is impossible to know the specific position of the standard sphere on the acoustic axis, the calibration accuracy is low. Under the influence of the difficulty of positioning the standard sphere, the existing calibration technology of a fish finder is time-consuming and labor-consuming, the time cost of a general survey ship is high, and the sea state window suitable for calibration time is uncertain, which increases the cost of survey at sea.
    SUMMARY The object of the present disclosure is to provide an on-site quick calibration system for a fish finder and a method thereof, the underwater positioning and automatic position control of the standard sphere for calibration of the fish finder can be quickly realized, and the efficiency and the accuracy of on-site acoustic parameter calibration of the fish finder are improved.
    The above technical object of the present disclosure is achieved by the following technical scheme.
    The present disclosure relates to an on-site quick calibration system for a fish finder, comprising a fish finder transducer, further comprising: a standard sphere, which is installed right below the fish finder transducer to be used as a reference for calibration; two acoustic beacons, which are fixedly connected above and below the standard sphere, respectively, send beacon underwater acoustic signals, and have built-in depth sensors for outputting beacon depth signals; three hydrophones, which receive and convert beacon underwater acoustic signals sent by acoustic beacons; a central console, which is coupled to the hydrophone, receives the converted beacon underwater acoustic signal and the beacon depth signal, calculates and obtains the underwater three-dimensional position of the standard sphere, and outputs a control signal; three take-up and pay-off components, each of which comprises a winding reel, a suspension wire, a winch and a controller, wherein the suspension wire is fixedly connected with the acoustic beacon above the standard sphere; the controller is coupled to the central console, responds to the control signal to control the winch to retract and release the suspension wire, and adjusts and controls the position of the standard sphere.
    Preferably, two acoustic beacons are equidistant from the standard sphere.
    Preferably, a weighting hammer is fixedly installed on the acoustic beacon located below the standard sphere.
    Preferably, a Hall sensor for detecting the length of the take-up and pay-off wire is installed on the winding reel, and the controller is coupled to the Hall sensor. Preferably, the winch is in wireless/wired connection with the controller.
    The present disclosure relates to an on-site quick calibration method for a fish finder, comprising the steps of: fixing the standard sphere by the suspension wires of the three take-up and pay-off components, and controlling the take-up and pay-off of the suspension wires by the winch to adjust the underwater position of the standard sphere; acquiring the underwater three-dimensional position of the standard sphere according to the underwater position information of acoustic beacons installed at equal distances above and below the standard sphere; calibrating the fish finder transducer according to the underwater three-dimensional position and the echo information of the standard sphere.
    Preferably, acquiring the underwater three-dimensional position of the standard sphere specifically comprises: calculating and obtaining the horizontal positions of the two acoustic beacons, IO respectively, according to the arrival time difference when the beacon underwater acoustic signals sent by the acoustic beacons above and below the standard sphere reach the three hydrophones, and obtaining the vertical positions of the acoustic beacons according to the beacon depth signals detected and acquired by the depth sensors of the acoustic beacons; determining the underwater positioning area of the standard sphere according to the position relationship between the standard sphere and two acoustic beacons, and confirming the underwater three-dimensional position of the standard sphere in conjunction with the echo information of the standard sphere obtained by the fish finder.
    To sum up, the present disclosure has the following beneficial effects.
    Through two acoustic beacons provided above and below the standard sphere and combined with three hydrophones, the positioning can be accurately realized, and the efficiency of three-dimensional positioning of the underwater standard sphere can be improved; without being limited by a split beam or a single beam system, the application is more convenient and universal with high efficiency and high precision, so that survey at sea is lower in cost and controllable.
    BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural diagram of the system. In the figure: 1. Hull; 2. Take-up and pay-off component; 3. Hydrophone; 4.
    Acoustic beacon; 5. Standard sphere; 6. Weighting hammer.
    DETAILED DESCRIPTION The present disclosure will be further described in detail with reference to the accompanying drawings.
    The transducer of fish finder is installed under the bottom of the ship. In the field survey, the sensitivity difference, interface plug and pull, and environmental difference between ultrasonic transducers will cause errors in the fish finder system. In addition, the position of the detection target in the transducer beam is different. Because of the directivity of the acoustic beam and the attenuation of the underwater propagation of the acoustic wave, it is necessary to locate the target accurately and therefore compensate for the backscattering energy. Therefore, when using a fish finder to quantitatively assess fishery resources, the fish finder system must be calibrated, including the echo intensity and the underwater three-dimensional position of the target. At present, the standard sphere 1s manually controlled just below the transducer by three hand-pay-off winding reels on the ship rail, and the fish finder is calibrated by the echo reflected by the standard sphere.
    The effective beam angle of a fish finder is relatively small, and the scientific fish finder is generally 8°, so itis difficult to control the position of the standard sphere within the beam. The survey environment at sea is changeable, and sometimes it is difficult to find the echo of the standard sphere from the fish finder screen due to being affected by ocean currents and waves, so that it is time-consuming and labor-consuming to calibrate.
    For single beam system, it is impossible to know the deviation direction of the standard sphere with respect to the acoustic axis. Even if the standard sphere echo is found on the fish finder screen, it is impossible to know how to control the standard sphere to make it close to the center of the acoustic axis in the next step. Because it is impossible to know the specific position of the standard sphere on the acoustic axis, the calibration accuracy is low. Under the influence of the difficulty of positioning the standard sphere, the existing calibration technology of a fish finder is time-consuming and labor-consuming, the time cost of a general survey ship is high, and the sea state window suitable for calibration time is uncertain, which increases the cost of survey at sea. Whereas, the existing split beam fish finder uses the arrival time difference when echo reaches each quadrant of the transducer to calculate the position deviation of the standard sphere with respect to the acoustic axis center of the transducer. Because the size of the fish finder transducer is small and the arrival time difference is small, the calculated position deviation accuracy is low.
    According to one or more embodiments, an on-site quick calibration system for a fish finder is disclosed, comprising a hull for offshore operation. As shown in FIG. 1, the system further comprises a fish finder transducer, a standard sphere, two acoustic beacons, a hydrophone, a take-up and pay-off component and a central console.
    The fish finder transducer is installed under the hull for detection. The standard 5 sphere is installed right below the fish finder transducer to be used as a reference to calibrate the fish finder transducer.
    Three take-up and pay-off components are provided, each of which comprises a winding reel, a suspension wire, a winch and a controller. The suspension wire is coiled by the winding reel, and the suspension wire is retracted and released by the winch. The IO winch is controlled by the controller. The standard sphere is fixedly connected underwater by the suspension wires of three take-up and pay-off components. A Hall sensor for detecting the length of the take-up and pay-off wire is installed on the winding reel. The Hall sensor acquires the length information of the take-up and pay-off wire according to the radius of the winding reel. The number of the Hall sensors is encrypted equidistantly by the rotating wheel of the winding reel to improve the control accuracy of the wire length. The Hall sensor outputs the detected length information of the take- up and pay-off wire to the controller.
    Two acoustic beacons are respectively provided above and below the standard sphere at equal distance from the standard sphere, and are provided on the upper and lower sides of the standard sphere. The acoustic beacons above the standard sphere are fixedly connected with the suspension wires of the take-up and pay-off components, and the acoustic beacons below the standard sphere are fixedly provided with weighting hammers, thus increasing the overall weight and reducing the influence of water flow. The acoustic beacon sends a beacon underwater acoustic signal correspondingly, and a depth sensor is built in the acoustic beacon to detect the depth information of the acoustic beacon in water in real time and output the beacon depth signal.
    Three hydrophones are provided, which are used to receive beacon underwater acoustic signals sent by two acoustic beacons, and carry out acoustic-electrical conversion on the received beacon underwater acoustic signals and transmit them to the central console.
    The central console can calculate and obtain the horizontal positions of the two acoustic beacons according to the arrival time difference when the beacon underwater acoustic signals sent by the two acoustic beacons reach each hydrophone. Then,
    according to the position between the two acoustic beacons and the standard sphere, combined with the water flow elements, the positioning range of the standard sphere can be narrowed, and the standard sphere can be quickly found. According to the beacon depth signals detected by the depth sensors built in the two acoustic beacons received by the central console, the vertical position of the standard sphere in water can be obtained, and then the underwater three-dimensional position area of the standard sphere can be obtained. According to the echo information of the standard sphere, the underwater positioning is carried out accurately. The echo information includes echo intensity, echo depth and phase information for the split beam system.
    The central console is wirelessly connected with the controller of each take-up and pay-off component through wireless network or is in wired connection with the controller. The central console outputs the generated control signal to the controller, and the length information output by the Hall sensor received by the controller is transmitted to the central console. The controller communicates with the central console bidirectionally, so that the controller can control the winch in response to the control signal.
    The central console also predicts the influence of ocean current on the standard sphere according to the underwater movement of the standard sphere, and predicts and controls the position of the standard sphere according to the real-time position of the standard sphere, the spatial layout of the winch and the length relationship of the take- up and pay-off wire.
    Three hydrophones combined with two acoustic beacons are used to three- dimensionally positioning the standard sphere underwater, which can improve the positioning accuracy without being limited by a split beam or single beam system.
    According to one or more embodiments, the present disclosure discloses an on-site quick calibration method for a fish finder, comprising the steps of: fixing the standard sphere by the suspension wires of the three take-up and pay-off components, and controlling the take-up and pay-off of the suspension wires by the winch to adjust the underwater position of the standard sphere; acquiring the underwater three-dimensional position of the standard sphere according to the underwater position information of acoustic beacons installed at equal distances above and below the standard sphere; calibrating the fish finder transducer according to the underwater three-dimensional position and the echo information of the standard sphere.
    Specifically, the specific steps of acquiring the underwater three-dimensional position of the standard sphere comprise: calculating and obtaining the horizontal positions of the two acoustic beacons, respectively, according to the arrival time difference when the beacon underwater acoustic signals sent by the acoustic beacons above and below the standard sphere reach the three hydrophones, and obtaining the vertical positions of the acoustic beacons according to the beacon depth signals detected and acquired by the depth sensors of the acoustic beacons; obtaining the underwater three-dimensional position area of the standard sphere according to the position relationship between the standard sphere and two acoustic beacons, and accurately positioning the standard sphere underwater in conjunction with the echo information of the standard sphere.
    This specific embodiment is only an explanation of the present disclosure, rather than a limitation on the present disclosure. After reading this specification, those skilled in the art can modify this embodiment without creative contribution as needed, which 1s protected by the patent law as long as it is within the scope of the claims of the present disclosure.
    权利要求:
    Claims (7)
    [1]
    -8- Conclusions l. Rapid calibration system for a fish finder on site, the calibration system comprising a fish finder transducer, the calibration system further comprising: a standard bulb installed exactly below the fish finder transducer to be used as a reference for calibration; two acoustic beacons, fixedly mounted above and below the standard sphere, respectively, which transmit underwater acoustic beacon signals, and have built-in depth sensors for outputting beacon depth signals; three hydrophones, which receive and convert underwater acoustic beacon signals transmitted by acoustic beacons; a central control panel coupled to the hydrophone, which receives the converted underwater acoustic beacon signal and the beacon depth signal, calculates and obtains the three-dimensional underwater position of the standard sphere, and outputs a control signal; three winding and unwinding components, each comprising a wind spool, a suspension wire, a winch and a regulator; wherein the suspension wire is fixedly attached to the acoustic beacon above the standard sphere, the controller is coupled to the central control panel, responds to the control signal to control the winch to retract and release the suspension wire, and the position of the standard sphere adjust and regulate.
    [2]
    The on-site fish finder rapid calibration system of claim 1, wherein two acoustic beacons are equidistant from the standard sphere.
    [3]
    The on-site fish finder rapid calibration system according to claim 2, wherein a weighted hammer is fixedly installed on the acoustic beacon located below the standard sphere.
    [4]
    The on-site fish finder rapid calibration system according to claim 1, wherein a series of Hall sensors for detecting the length of the winding and unwinding wire are installed on the wind spool, and the controller is coupled to the Hall sensors.
    -9.
    [5]
    The on-site fish finder rapid calibration system of claim 4, wherein the winch is in wireless/wired communication with the controller.
    [6]
    6. Rapid calibration method for a fish finder on site, the method comprising the steps of: securing the standard sphere by means of the suspension wires of the three winding and unwinding components, and controlling the winding and unwinding of the suspension wires by the winch around the adjust the underwater position of the standard bulb; acquiring the three-dimensional underwater position of the standard sphere according to the underwater position information from acoustic beacons installed equidistant above and below the standard sphere; calibrating the fish finder converter according to the three-dimensional underwater position and the echo information of the standard sphere.
    [7]
    The fast calibration method for a fish finder on site according to claim 6, wherein acquiring the three-dimensional underwater position of the standard sphere specifically comprises: calculating and obtaining the horizontal positions of the two acoustic beacons, respectively, according to the difference in arrival time when the underwater acoustic beacon signals sent by the acoustic beacons above and below the standard sphere reaching the three hydrophones, and obtaining the vertical positions of the acoustic beacons according to the beacon depth signals detected and acquired by the depth sensors of the acoustic beacons; determining the underwater positioning area of the standard sphere according to the positional relationship between the standard sphere and two acoustic beacons, and confirming the three-dimensional underwater position of the standard sphere in conjunction with the echo information of the standard sphere obtained by the fish finder.
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    同族专利:
    公开号 | 公开日
    CN112014847A|2020-12-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CN202010874845.9A|CN112014847A|2020-08-27|2020-08-27|System and method for rapidly correcting fish finder on site|
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