CN113777596A - Adaptive fish finder gain compensation method and device based on sea depth detection - Google Patents
Adaptive fish finder gain compensation method and device based on sea depth detection Download PDFInfo
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- CN113777596A CN113777596A CN202111189419.2A CN202111189419A CN113777596A CN 113777596 A CN113777596 A CN 113777596A CN 202111189419 A CN202111189419 A CN 202111189419A CN 113777596 A CN113777596 A CN 113777596A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/523—Details of pulse systems
- G01S7/526—Receivers
- G01S7/529—Gain of receiver varied automatically during pulse-recurrence period
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/96—Sonar systems specially adapted for specific applications for locating fish
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/534—Details of non-pulse systems
- G01S7/5345—Gain control of receivers
Abstract
The invention relates to a self-adaptive fish finder gain compensation method and a device based on sea depth detection, wherein the method comprises the following steps: acquiring a preset initial compensation curve to perform gain compensation on the first echo signal; calculating a first depth value according to the compensated first echo signal; selecting a corresponding compensation curve according to the magnitude relation between the first depth value and the first threshold value to perform gain compensation on the second echo signal; calculating a second depth value according to the compensated second echo signal; and selecting a corresponding compensation curve according to the size relation between the second depth value and the second threshold value and the third threshold value to perform gain compensation on the target signal. According to the method, the first echo signal and the second echo signal are subjected to gain compensation, the depth value is calculated according to the compensated echo signals, a more accurate current sea depth value is obtained, a more accurate compensation curve is determined according to the depth value, the target signal is subjected to gain compensation, the accuracy of gain compensation of the target signal is achieved, and the accuracy of fish shoal detection is improved.
Description
Technical Field
The invention relates to the technical field of fish detection for marine fishery fishing, in particular to a self-adaptive fish detector gain compensation method and device based on sea depth detection.
Background
As the most widely used fishing instrument in marine fishery, a fish finder emits acoustic signals and detects the position and size of a fish school by using reflected underwater acoustic echo information after encountering a target. Due to the expansion of the wave front, the acoustic signal will be attenuated with the increase of the propagation distance in the propagation process of the ocean acoustic channel, namely the expansion loss. The expansion loss causes the problem that the echo intensity of the long-distance target is inconsistent with that of the short-distance target, and the targets with the same size are presented with different sizes on the display end. Therefore, in order to achieve the same strength of the echo signals of the targets with different distances and the same size on the display end, a gain compensation control part is required to be added in the receiving system of the fish finder. The gain compensation principle is that a voltage gain control signal is generated according to a gain compensation curve corresponding to the distance between the transducer and a detection target, and the voltage gain control signal is used for carrying out intensity compensation on an echo signal, so that the purpose of automatically amplifying long-distance echo is achieved.
Ideally, the sound signal expands spherically in deep sea and cylindrically in shallow sea. The traditional gain compensation method requires a user to manually select the gain according to the actual working sea area condition of the fishing boat in a display interface. Taking an SX90 horizontal fish finder manufactured by SIMRAD company of norway as an example, the gain compensation value is divided into two grades of 10lgR and 20lgR, which respectively correspond to two expansion modes of cylindrical expansion and spherical expansion, wherein R is the detection distance. According to the gain compensation method for manually setting the limited gears, compensation errors may be introduced in uncertain areas of deep and shallow sea due to changes of operating sea areas and uncertainty of depth, so that objects with the same size are displayed in different sizes on a display end; in actual working environment, because the working ship is often in an uncertain region of deep sea and shallow sea, the expansion mode is between spherical expansion and cylindrical expansion, namely the gain compensation value is between 10lgR and 20 lgR. In addition, since the manual judgment requires a certain experience, the accuracy of the gain compensation is affected if the gain is set by mistake.
Disclosure of Invention
The invention aims to provide a self-adaptive fish finder gain compensation method and device based on sea depth detection, which can automatically select and match the compensation parameters of the current depth according to the depth, realize the intelligence and convenience of the gain compensation process and improve the accuracy of the echo signal gain compensation.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a self-adaptive fish finder gain compensation method based on sea depth detection, which comprises the following steps:
s1, obtaining an initial compensation curve corresponding to a preset initial compensation value to perform gain compensation on the first echo signal, and obtaining a compensated first echo signal; the first echo signal is an echo signal of a first detection signal after being reflected by the sea bottom;
s2, calculating a first depth value according to the compensated first echo signal;
s3, judging whether the first depth value is larger than a first threshold value; if so, performing gain compensation on the second echo signal according to a first compensation curve corresponding to the first compensation parameter; if not, performing gain compensation on the second echo signal according to a second compensation curve corresponding to the second compensation parameter; the second echo signal is an echo signal of a second detection signal after being reflected by the sea bottom;
s4, calculating a second depth value according to the compensated second echo signal;
s5, judging whether the second depth value is smaller than a second threshold value;
if so, performing gain compensation on the target signal according to the second compensation curve;
if not, judging whether the second depth value is larger than a third threshold value;
when the second depth value is larger than a third threshold value, performing gain compensation on the target signal according to a first compensation curve;
when the second depth value is between the second threshold value and the third threshold value, calculating a gain multiple through an empirical function of the gain multiple and the depth value and the second depth value, determining a third compensation parameter according to the gain multiple, and determining a third compensation curve according to the third compensation parameter to perform gain compensation on the target signal; the target signal is an echo signal of the fish school detection signal reflected by the sea bottom.
Optionally, after executing step S5, the method further includes:
performing gain compensation on a third echo signal according to the third compensation curve, and calculating a third depth value according to the third echo signal; the third echo signal is an echo signal of a third probe signal reflected from the sea bottom, and the third probe signal is a signal that is continuously transmitted after step S5;
judging whether the difference value of the third depth value and the second depth value is larger than a fourth threshold value or not; if yes, replacing the second depth value with the third depth value, and returning to the step S5; if not, keeping the second depth value to continue measuring.
In order to achieve the above object, the present invention further provides an adaptive fish finder gain compensation device based on deep sea exploration, for performing gain compensation on an echo signal formed after a transmission signal of a fish finder is reflected by a sea floor, the device comprising:
the waveform generator is used for generating a first detection signal, a second detection signal and a fish detection signal;
the transceiver is connected with the waveform generator and used for transmitting the first detection signal and receiving a first echo signal of the first detection signal after the first detection signal is reflected by the sea bottom; the second detection signal is used for transmitting the second detection signal and receiving a second echo signal of the second detection signal after being reflected by the sea bottom; the system is used for transmitting the fish school detection signal and receiving a target signal of the fish school detection signal after being reflected by the seabed;
the compensation unit is connected with the transceiver and used for performing gain compensation on the first echo signal according to an initial compensation curve corresponding to a preset initial compensation value to obtain a compensated first echo signal;
a processor, connected to the transceiver, for calculating a first depth value according to the compensated first echo signal;
the comparison unit is connected with the processor and used for judging whether the first depth value is larger than a first threshold value or not;
the compensation unit is also connected with the comparison unit and is used for performing gain compensation on the second echo signal according to a first compensation curve corresponding to the first compensation parameter when the first depth value is greater than a first threshold value; the second compensation parameter is used for compensating the gain of the second echo signal according to a second compensation curve corresponding to the second compensation parameter when the first depth value is smaller than or equal to the first threshold value;
the processor is further configured to calculate a second depth value according to the compensated second echo signal;
the comparison unit is used for judging whether the second depth value is smaller than a second threshold value or not;
the compensation unit is further configured to perform gain compensation on the target signal according to a second compensation curve when the second depth value is smaller than a second threshold; the target signal is an echo signal of a fish school detection signal reflected by the sea bottom;
the comparing unit is further configured to determine whether the second depth value is greater than a third threshold value when the second depth value is greater than or equal to a second threshold value;
the compensation unit is further configured to perform gain compensation on the target signal according to a first compensation curve when the second depth value is greater than a third threshold;
the processor is further configured to calculate a gain multiple according to an empirical function of the gain multiple and the depth value and the second depth value when the second depth value is between the second threshold and the third threshold, determine a third compensation parameter according to the gain multiple, and determine a third compensation curve according to the third compensation parameter;
the compensation unit is further configured to perform gain compensation on the target signal according to the third compensation curve.
Optionally, the compensation unit is further configured to perform gain compensation on a third echo signal according to the third compensation curve, where the third echo signal is an echo signal of a third detection signal reflected from the sea bottom, and the third detection signal is a signal that is transmitted without interruption after the compensation unit performs gain compensation on the target signal according to the third compensation curve;
the processor is further configured to calculate a third depth value from the third echo signal;
the comparison unit is further configured to determine whether a difference between the third depth value and the second depth value is greater than or equal to a fourth threshold;
the processor is further configured to replace the second depth value with the third depth value when a difference between the third depth value and the second depth value is greater than or equal to a fourth threshold.
Optionally, the apparatus further comprises:
and the transducer is connected with the transceiver and used for converting the signal transmitted by the transceiver into an acoustic signal and transmitting the acoustic signal and converting the echo signal received by the transceiver into an electric signal.
Optionally, the apparatus further comprises:
and the display is connected with the processor and used for displaying the strength of the first echo signal, the strength of the second echo signal and the strength of the target signal.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a self-adaptive fish finder gain compensation method and a device based on sea depth detection, wherein the method comprises the following steps: acquiring an initial compensation curve to perform gain compensation on the first echo signal; calculating a first depth value according to the compensated first echo signal; judging whether the first depth value is larger than a first threshold value or not; if so, performing gain compensation on the second echo signal according to the first compensation curve; if not, performing gain compensation on the second echo signal according to the second compensation curve; calculating a second depth value according to the compensated second echo signal; judging whether the second depth value is smaller than a second threshold value; if so, performing gain compensation on the target signal according to the second compensation curve; if not, judging whether the second depth value is larger than a third threshold value; when the second depth value is larger than a third threshold value, performing gain compensation on the target signal according to a first compensation curve; and when the second depth value is between the second threshold value and the third threshold value, calculating a gain multiple through an empirical function of the gain multiple and the depth value and the second depth value, determining a third compensation parameter according to the gain multiple, and determining a third compensation curve according to the third compensation parameter to perform gain compensation on the target signal. According to the method, the first echo signal and the second echo signal are subjected to gain compensation, the depth value is calculated according to the compensated echo signals, a more accurate seabed depth value is obtained, a more accurate compensation curve is determined according to the depth value, the target signal is subjected to gain compensation, the accuracy of the gain compensation of the target signal is achieved, and the accuracy of fish shoal detection is improved.
In addition, the adaptive fish finder gain compensation device based on sea depth detection can automatically select and match the compensation parameters of the current depth according to the depth, and the intelligence and convenience of the gain compensation process are realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments 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 it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a conventional gain compensation method for a fish finder;
FIG. 2 is a flow chart of the adaptive fish finder gain compensation method based on sea depth detection according to the present invention;
FIG. 3 is a graph showing the relationship between depth and gain factor;
fig. 4 is a schematic structural diagram of the adaptive fish finder gain compensation device based on sea depth detection according to the present invention.
Description of the symbols:
waveform generator-1, transceiver-2, compensation unit-3, processor-4, comparison unit-5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The propagation of the acoustic signal in the sea gradually attenuates with the distance, so that the intensity of the echo signal returning after encountering the target is obviously reduced compared with the transmitted signal, and in addition, the echo signal intensities of the targets with different distances are inconsistent. The gain compensation is to adjust the echo gain to compensate the propagation loss, so that the echo intensities of the compensated targets at different distances are consistent, and the targets with the same density and size can show the same intensity on the display end. The traditional gain compensation method relies on the user to set and select compensation parameters at a control panel to adjust the gain according to the experience and the sea surface environment. Fig. 1 is a flowchart illustrating a conventional compensation method.
Compared with the traditional method, the invention can automatically select the gain compensation parameters according to the current sea depth, thereby reducing the compensation error caused by uncertain operation sea areas, improving the accuracy of gain compensation and increasing the intelligence of the fish finder.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 2, the adaptive fish finder gain compensation method based on sea depth detection of the present invention includes: primary compensation, secondary compensation and tertiary compensation.
The primary compensation comprises the following steps: s1, obtaining an initial compensation curve corresponding to a preset initial compensation value to perform gain compensation on the first echo signal, and obtaining a compensated first echo signal; the first echo signal is an echo signal of a first detection signal after being reflected by the sea bottom;
s2, calculating a first depth value according to the compensated first echo signal;
s3, judging whether the first depth value is larger than a first threshold value; if so, performing gain compensation on the second echo signal according to a first compensation curve corresponding to the first compensation parameter; if not, performing gain compensation on the second echo signal according to a second compensation curve corresponding to the second compensation parameter; the second echo signal is an echo signal of a second detection signal after being reflected by the sea bottom;
s4, calculating a second depth value according to the compensated second echo signal;
s5, judging whether the second depth value is smaller than a second threshold value;
if so, performing gain compensation on the target signal according to the second compensation curve;
if not, judging whether the second depth value is larger than a third threshold value;
when the second depth value is larger than a third threshold value, performing gain compensation on the target signal according to a first compensation curve;
if not, judging whether the second depth value is larger than a third threshold value;
when the second depth value is larger than a third threshold value, performing gain compensation on the target signal according to a first compensation parameter;
when the second depth value is between the second threshold value and the third threshold value, calculating a gain multiple through an empirical function of the gain multiple and the depth value and the second depth value, determining a third compensation parameter according to the gain multiple, and determining a third compensation curve according to the third compensation parameter to perform gain compensation on the target signal; the target signal is an echo signal of the fish school detection signal reflected by the sea bottom.
Further, in a specific embodiment of the present invention, the preset initial compensation value is 15 lgR; the first compensation parameter is 20 lgR; the second compensation parameter is 10 lgR.
During the second compensation, if the first depth value exceedsFirst threshold value ThFor example, 300 meters, the ship is considered to be in a deep sea area, the expansion loss is calculated according to spherical expansion, and the compensation parameter is 20 lgR; if the first depth value is smaller than the first threshold value ThAnd considering that the ship is in the shallow sea area, calculating the expansion loss according to the cylindrical surface expansion, and selecting 10lgR as the compensation parameter.
During the third compensation, the second depth value is segmented, and if the second depth value is smaller than the second threshold value Th1Selecting 10lgR as compensation parameter; if the second depth value exceeds the third threshold value Th2Selecting 20lgR as compensation parameter; if the second depth value is at Th1And Th2And calculating the gain multiple according to the empirical function of the depth value and the gain multiple and the depth, selecting a third compensation parameter corresponding to the gain multiple, and performing gain compensation on the target signal according to the third compensation curve. FIG. 3 is a graph of depth values versus gain factor.
The fishing boat is usually in a sailing state in the operation process of detecting fish schools, the position of the boat changes in real time, and the depth of the current working sea area also changes in real time, so after the compensation curve is determined through three times of compensation, the following steps are executed to measure the sea depth again.
Specifically, after step S5 is executed, the method further includes:
performing gain compensation on a third echo signal according to the third compensation curve, and calculating a third depth value according to the third echo signal; the third echo signal is an echo signal of a third probe signal reflected from the sea bottom, and the third probe signal is a signal that is continuously transmitted after step S5;
judging whether the difference value of the third depth value and the second depth value is larger than a fourth threshold value or not; if yes, replacing the second depth value with the third depth value, and returning to the step S5; if not, keeping the second depth value to continue measuring. By the steps, based on the sea depth change condition, the adaptive adjustment of the gain compensation of the fish finder is realized, and the detection precision of the fish finder on fish shoals is improved.
In order to achieve the above object, the present invention further provides an adaptive fish finder gain compensation device based on sea depth detection, as shown in fig. 4, the device includes: waveform generator 1, transceiver 2, compensation unit 3, processor 4 and comparison unit 5.
The waveform generator 1 is configured to generate a first detection signal, a second detection signal, and a fish detection signal.
The transceiver 2 is connected with the waveform generator 1 and is used for transmitting the first detection signal and receiving a first echo signal of the first detection signal after the first detection signal is reflected by the sea bottom; the second detection signal is used for transmitting the second detection signal and receiving a second echo signal of the second detection signal after being reflected by the sea bottom; the device is used for transmitting the submarine detection signal and receiving a target signal of the submarine detection signal after being reflected by the seabed.
And the compensation unit 3 is connected with the transceiver 2 and is used for performing gain compensation on the first echo signal according to an initial compensation curve corresponding to a preset initial compensation value to obtain a compensated first echo signal.
And the processor 4 is connected with the transceiver 2 and used for calculating a first depth value according to the compensated first echo signal.
A comparing unit 5, connected to the processor, for determining whether the first depth value is greater than a first threshold;
the compensation unit 3 is further connected to the comparison unit 5, and configured to perform gain compensation on the second echo signal according to a first compensation curve corresponding to the first compensation parameter when the first depth value is greater than the first threshold; and when the first depth value is smaller than or equal to the first threshold value, performing gain compensation on the second echo signal according to a second compensation curve corresponding to the second compensation parameter.
The processor 4 is further configured to calculate a second depth value according to the compensated second echo signal.
The comparing unit 5 is configured to determine whether the second depth value is smaller than a second threshold.
The compensation unit 3 is further configured to perform gain compensation on the target signal according to a second compensation curve when the second depth value is smaller than a second threshold; the target signal is an echo signal of the fish school detection signal reflected by the sea bottom.
The comparing unit 5 is further configured to determine whether the second depth value is greater than a third threshold when the second depth value is greater than or equal to a second threshold.
The compensation unit 3 is further configured to perform gain compensation on the target signal according to a first compensation curve when the second depth value is greater than a third threshold.
The processor 4 is further connected to the compensation unit 3, and configured to calculate a gain multiple according to an empirical function of the gain multiple and the depth value and the second depth value when the second depth value is between the second threshold and the third threshold, determine a third compensation parameter according to the gain multiple, and determine a third compensation curve according to the third compensation parameter.
The compensation unit 3 is further configured to perform gain compensation on the target signal according to the third compensation curve.
Further, the compensation unit 3 is further configured to perform gain compensation on a third echo signal according to the third compensation curve, where the third echo signal is an echo signal of a third detection signal reflected by the sea bottom, and the third detection signal is a signal that is transmitted uninterruptedly after the compensation unit 3 performs gain compensation on the target signal according to the third compensation curve.
The processor 4 is further configured to calculate a third depth value from the third echo signal.
The comparing unit 5 is further configured to determine whether a difference between the third depth value and the second depth value is greater than or equal to a fourth threshold.
The processor 4 is further configured to replace the second depth value with the third depth value when a difference between the third depth value and the second depth value is greater than or equal to a fourth threshold value.
Further, the apparatus further comprises: a transducer.
And the transducer is connected with the transceiver and used for converting the signal transmitted by the transceiver into an acoustic signal and transmitting the acoustic signal and converting the echo signal received by the transceiver into an electric signal.
Optionally, the apparatus further comprises: a display.
And the display is connected with the processor and used for displaying the strength of the first echo signal, the strength of the second echo signal and the strength of the target signal. Wherein different intensities are displayed as different colors.
Further, the compensation unit 3 is also connected with a voltage amplifier and an analog-to-digital converter.
The transceiver is also connected to a processor, by means of which the received echo signals are processed.
The compensation unit is also connected with the transceiver and sends the compensation curve to a receiving channel of the transceiver.
The working principle of the invention is as follows: the signal processing unit generates a detection waveform through the waveform generator in the transmitting process, and meanwhile, the FPGA outputs a default compensation curve; the echo signal processed by the received signal processing module in the receiving process is input to a display for displaying, meanwhile, the processor calculates a first depth value according to the echo signal return time, selects a corresponding gain multiple by the gain multiple calculating module, then reads a compensation curve stored in the compensation curve storage module, and starts the compensation of transmitting the echo for the second time. After receiving the second echo signal, the processor starts to calculate a second depth value, calculates a gain multiple according to the corresponding relation between the second depth value and the gain multiple, and then selects a compensation curve corresponding to the gain to start the compensation of the third echo emission. And after the three times of compensation, the sea depth measurement is carried out again, and the current depth is compared with the previous depth by the comparison unit. If the depth difference exceeds the threshold value, calculating gain multiples and selecting a compensation curve again; if the depth difference is smaller than the threshold value, the current compensation value is kept until the difference value exceeds the threshold value, and the process is continued until the detection is finished.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A self-adaptive fish finder gain compensation method based on sea depth detection is characterized by comprising the following steps:
s1, obtaining an initial compensation curve corresponding to a preset initial compensation value to perform gain compensation on the first echo signal, and obtaining a compensated first echo signal; the first echo signal is an echo signal of a first detection signal after being reflected by the sea bottom;
s2, calculating a first depth value according to the compensated first echo signal;
s3, judging whether the first depth value is larger than a first threshold value; if so, performing gain compensation on the second echo signal according to a first compensation curve corresponding to the first compensation parameter; if not, performing gain compensation on the second echo signal according to a second compensation curve corresponding to the second compensation parameter; the second echo signal is an echo signal of a second detection signal after being reflected by the sea bottom;
s4, calculating a second depth value according to the compensated second echo signal;
s5, judging whether the second depth value is smaller than a second threshold value;
if so, performing gain compensation on the target signal according to the second compensation curve;
if not, judging whether the second depth value is larger than a third threshold value;
when the second depth value is larger than a third threshold value, performing gain compensation on the target signal according to a first compensation curve;
if not, judging whether the second depth value is larger than a third threshold value;
when the second depth value is larger than a third threshold value, performing gain compensation on the target signal according to a first compensation parameter;
when the second depth value is between the second threshold value and the third threshold value, calculating a gain multiple through an empirical function of the gain multiple and the depth value and the second depth value, determining a third compensation parameter according to the gain multiple, and determining a third compensation curve according to the third compensation parameter to perform gain compensation on the target signal; the target signal is an echo signal of the fish school detection signal reflected by the sea bottom.
2. The adaptive fish finder gain compensation method based on sea depth detection according to claim 1, further comprising after performing step S5:
performing gain compensation on a third echo signal according to the third compensation curve, and calculating a third depth value according to the third echo signal; the third echo signal is an echo signal of a third probe signal reflected from the sea bottom, and the third probe signal is a signal that is continuously transmitted after step S5;
judging whether the difference value of the third depth value and the second depth value is larger than a fourth threshold value or not; if yes, replacing the second depth value with the third depth value, and returning to the step S5; if not, keeping the second depth value to continue measuring.
3. An adaptive fish finder gain compensation device based on sea depth detection is used for carrying out gain compensation on echo signals formed by transmitting signals of a fish finder after being reflected by the sea bottom, and is characterized by comprising:
the waveform generator is used for generating a first detection signal, a second detection signal and a fish detection signal;
the transceiver is connected with the waveform generator and used for transmitting the first detection signal and receiving a first echo signal of the first detection signal after the first detection signal is reflected by the sea bottom; the second detection signal is used for transmitting the second detection signal and receiving a second echo signal of the second detection signal after being reflected by the sea bottom; the system is used for transmitting the fish school detection signal and receiving a target signal of the fish school detection signal after being reflected by the seabed;
the compensation unit is connected with the transceiver and used for performing gain compensation on the first echo signal according to an initial compensation curve corresponding to a preset initial compensation value to obtain a compensated first echo signal;
a processor, connected to the transceiver, for calculating a first depth value according to the compensated first echo signal;
the comparison unit is connected with the processor and used for judging whether the first depth value is larger than a first threshold value or not;
the compensation unit is also connected with the comparison unit and is used for performing gain compensation on the second echo signal according to a first compensation curve corresponding to the first compensation parameter when the first depth value is greater than a first threshold value; the second compensation parameter is used for compensating the gain of the second echo signal according to a second compensation curve corresponding to the second compensation parameter when the first depth value is smaller than or equal to the first threshold value;
the processor is further configured to calculate a second depth value according to the compensated second echo signal;
the comparison unit is used for judging whether the second depth value is smaller than a second threshold value or not;
the compensation unit is further configured to perform gain compensation on the target signal according to a second compensation curve when the second depth value is smaller than a second threshold; the target signal is an echo signal of a fish school detection signal reflected by the sea bottom;
the comparing unit is further configured to determine whether the second depth value is greater than a third threshold value when the second depth value is greater than or equal to a second threshold value;
the compensation unit is further configured to perform gain compensation on the target signal according to a first compensation curve when the second depth value is greater than a third threshold;
the processor is further configured to calculate a gain multiple according to an empirical function of the gain multiple and the depth value and the second depth value when the second depth value is between the second threshold and the third threshold, determine a third compensation parameter according to the gain multiple, and determine a third compensation curve according to the third compensation parameter;
the compensation unit is further configured to perform gain compensation on the target signal according to the third compensation curve.
4. The adaptive fish finder gain compensation device based on deep sea exploration according to claim 3, wherein the compensation unit is further configured to perform gain compensation on a third echo signal according to the third compensation curve, the third echo signal is an echo signal of the third exploration signal reflected by the sea bottom, and the third exploration signal is a signal that is transmitted without interruption after the compensation unit performs gain compensation on the target signal according to the third compensation curve;
the processor is further configured to calculate a third depth value from the third echo signal;
the comparison unit is further configured to determine whether a difference between the third depth value and the second depth value is greater than or equal to a fourth threshold;
the processor is further configured to replace the second depth value with the third depth value when a difference between the third depth value and the second depth value is greater than or equal to a fourth threshold.
5. The adaptive fish finder gain compensation device based on sea depth detection of claim 3, wherein the device further comprises:
and the transducer is connected with the transceiver and used for converting the signal transmitted by the transceiver into an acoustic signal and transmitting the acoustic signal and converting the echo signal received by the transceiver into an electric signal.
6. The adaptive fish finder gain compensation device based on sea depth detection of claim 3, wherein the device further comprises:
and the display is connected with the processor and used for displaying the strength of the first echo signal, the strength of the second echo signal and the strength of the target signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111189419.2A CN113777596A (en) | 2021-10-12 | 2021-10-12 | Adaptive fish finder gain compensation method and device based on sea depth detection |
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