A method for river and lake supervision

Abstract

The application relates to the technical field of river and lake monitoring, and provides a river and lake monitoring method, a first position and a second position are arranged on the same water bank side, time domain signals in water and in air are collected at the first position and the second position, whether the collected time domain signals have blasting characteristic signals is judged, the distance between the first position and a blasting point and the distance between the second position and the blasting point are calculated according to the time when the signals with the blasting characteristics are received, so that the accurate position of the blasting point is determined, the calculation amount is reduced, and the method is beneficial to popularization and use in actual life; the second preset time is arranged to limit the acoustic signals received in the air and in the water after one blasting, and the time efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of river and lake supervision, and particularly relates to a river and lake supervision method. BACKGROUND

[0002] The river and lake supervision content includes four disorders, illegal pollution, electric fishing and blasting, etc. With the rapid development of information, remote sensing, video, AI, Beidou high-precision positioning and other technologies, such as illegal sand mining, illegal occupation, illegal stacking and illegal pollution, electric fishing and other four disorders have made significant progress in monitoring means; however, due to the fact that the management range line is relatively long, illegal behaviors are implemented quickly and concealed, illegal fishing and illegal blasting behaviors have the problems of supervision and monitoring, and in most cases, only rely on public reporting supervision.

[0003] The unified feature of illegal fishing and illegal blasting is blasting and explosion phenomenon, which is often realized by air array, high-speed photography, photoelectric measurement method, etc.; among them, the air array structure is relatively complex and high in cost, and is not suitable for popularization and use; due to the concealment characteristics of illegal fishing and illegal blasting operation in river and lake supervision, the monitoring difficulty of high-speed photography and photoelectric measurement method is relatively large, and it is not suitable for river and lake supervision.

[0004] In order to further improve the river and lake supervision ability, it is urgent to propose a method for real-time monitoring of illegal fishing and blasting behaviors to solve the above problems. SUMMARY

[0005] In order to solve the above technical problems, the present application provides a river and lake supervision method, which monitors the fishing and blasting behaviors in the management range of rivers and lakes, and automatically reports the explosion area range.

[0006] In a first aspect, the present application provides a river and lake supervision method for monitoring fishing and blasting behaviors in rivers and lakes, wherein a first position and a second position are set on the same water bank side of the shallow water area of the river and lake, and the first position and the second position are apart by a fixed distance.

[0007] The method comprises the following steps:

[0008] S1, a first preset time and a second preset time are set, and the first position and the second position are respectively entered into the first time counting;

[0009] S2, whether the first time counting time exceeds the first preset time is judged at the first position and the second position, if yes, the second preset time, the real-time sound speed in water and air are updated, and the first time counting is restarted, and the second preset time and the real-time sound speed in the supervision process are updated in real time;

[0010] S3. Acquire a first underwater acoustic time domain signal at the first position and the second position, respectively, and determine whether the first acoustic time domain signal contains a blasting feature. If so, record the corresponding first acoustic time domain signal as the first blasting feature signal and the time of receiving the first blasting feature signal, and enter the second timing. If not, enter S3.

[0011] S4. Continuously acquiring a first underwater acoustic time domain signal at the first position and a second airborne acoustic time domain signal at the second position, respectively, and determining whether the second timing exceeds a second preset time. If so, the second timing is stopped and the process proceeds to S3; if not, the process proceeds to S5.

[0012] S5. At the first position and the second position, respectively, determine whether the second acoustic time domain signal contains a blast feature. If so, record the corresponding second acoustic time domain signal as the second blast feature signal and the time of receiving the second blast feature signal, and proceed to S6. If not, determine whether the currently acquired first acoustic time domain signal contains a blast feature. If so, sequentially record the corresponding first acoustic time domain signal as the first blast feature signal and the time of receiving each first blast feature signal, and proceed to S4. If not, directly proceed to S4.

[0013] S6. Calculate the first distance between the first position and the blasting point and the second distance between the second position and the blasting point based on the second blasting characteristic signal at the first position and the second position, the first blasting characteristic signal, and the receiving time, determine the position of the blasting point based on the first distance and the second distance, and issue an alarm.

[0014] Further, in S3, determining whether the first acoustic time domain signal contains a burst feature includes the following steps: performing digital signal processing on the first acoustic time domain signal to obtain a processed first acoustic time domain signal and a first frequency domain signal; and performing feature extraction on the processed first acoustic time domain signal and the first frequency domain signal to determine whether the signal contains a burst feature.

[0015] Furthermore, the second preset time at the first position and the second position are both calculated by the following formula:

[0016] ,

[0017] in, is the second preset time, R is the detection radius, is the real-time speed of sound in the air, , is the speed of sound in space at zero degrees Celsius, and Tem1 is the air temperature collected in real time at the first position or the second position.

[0018] Furthermore, in S6, based on the second blasting characteristic signals at the first position and the second position, the first blasting characteristic signal, and the reception time, a first distance between the first position and the blasting point and a second distance between the second position and the blasting point are calculated respectively, the position of the blasting point is determined based on the first distance and the second distance, and an alarm is issued, which specifically includes the following steps:

[0019] S61, judging whether the blasting point is located in water based on each first blasting characteristic signal recorded at the first position or the second position, if so, proceeding to S62; if not, proceeding to S64;

[0020] S62. At the first position and the second position, a first distance between the first position and the blasting point and a second distance between the second position and the blasting point are calculated based on the real-time sound speed in water and air, the reception time of the second blasting characteristic signal, and the reception time of the first blasting characteristic signal with the largest amplitude.

[0021] S63, determining the location of the blasting point based on the first distance and the second distance; reporting the location of the blasting point and the blasting type as underwater blasting, and issuing an underwater blasting alarm;

[0022] S64. Calculate, at both the first position and the second position, a third distance between the first position and the blasting point and a fourth distance between the second position and the blasting point based on the real-time sound speed in water and air, the sound speed of the formation, the reception time of the second blasting characteristic signal, and the reception time of the first blasting characteristic signal with the largest amplitude;

[0023] S65. Determine the location of the blasting point based on the third distance and the fourth distance; report the location of the blasting point and the blasting type as ground blasting, and issue a ground blasting alarm.

[0024] Furthermore, in S61, determining whether the blasting point is located in water based on each first blasting characteristic signal recorded at the first position or the second position specifically includes:

[0025] The first blasting characteristic signals recorded at the first position or the second position are sorted according to the time domain amplitude, and the first blasting characteristic signal with the largest amplitude is obtained and recorded as M1 and the first blasting characteristic signal with the second largest amplitude is recorded as M2. If M1 ≥ 2 M2, it is determined that the blasting point is in water.

[0026] Furthermore, in S63, the position of the blasting point is determined according to the first distance and the second distance, specifically including:

[0027] Draw a circle with the first position as the center and the first distance as the radius; draw a circle with the second position as the center and the second distance as the radius to obtain two circles; if there is an intersection between the two circles, the blasting point is located at the intersection in the water.

[0028] Further, in S65, determining the location of the blasting point according to the third distance and the fourth distance includes:

[0029] Draw a circle with the first position as the center and the third distance as the radius, and draw a circle with the second position as the center and the fourth distance as the radius, to obtain two circles;

[0030] Determine whether one of the intersection points of the two circles is in the water. If so, it is considered that the blasting point is located at the intersection point of the circles away from the water bank. If not, determine whether the difference in reception time of any two first blasting characteristic signals at the first position or the second position is greater than or equal to the ratio of the third distance or the fourth distance to the real-time sound speed in the water. If so, it is considered that the blasting point is located at the intersection point of the circles at the first position away from the water bank. If not, it is considered that the blasting point is located at the intersection point of the circles at the first position close to the water bank.

[0031] In a second aspect, the present invention provides an electronic device, the electronic device comprising:

[0032] processor and memory;

[0033] The processor is used to execute the steps of the method of the first aspect by calling the program or instructions stored in the memory.

[0034] In a third aspect, the present invention provides a computer-readable storage medium storing a program or instruction, wherein the program or instruction enables a computer to execute the steps of the method of the first aspect.

[0035] The present invention has the following technical effects:

[0036] The present application sets a first position and a second position on the same waterside, collects time domain signals in water and air at the first position and the second position at the same time, determines whether the collected time domain signals contain blasting characteristic signals, and then calculates the distance between the first position and the blasting point and the distance between the second position and the blasting point based on the time when the blasting characteristic signals are received to determine the exact location of the blasting point, and issues an alarm, thereby reducing the amount of calculation and facilitating its widespread use in real life.

[0037] The present application improves time efficiency by setting a second preset time to limit the acoustic signals that can be received in the air and water after an explosion occurs; and updates the second preset time in real time by monitoring temperature changes over a certain period of time, thereby reducing the impact of temperature on the speed of sound and improving calculation accuracy and speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 This is a flow chart of a method for river and lake supervision provided by an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of blasting point locations for river and lake supervision provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention are described clearly and completely below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0042] First, the following are explained:

[0043] According to public papers and other documents, the sound of blasting has highly recognizable characteristics in the time domain and frequency domain. In addition, the speed of sound propagation in different media is different, and the speed difference method can be used to calculate the sound propagation distance. Furthermore, the propagation of sound between different media involves natural phenomena such as reflection, transmission, and refraction. For example, sonic logging is used in surveying work, and there is loss in propagation in the same medium. There is a large amount of energy loss in propagation at the interface between different media. Within the scope of river and lake supervision, sound will propagate in media such as earth, water, and air. The same sound signal may penetrate different media, and the intensity and amplitude of the sound wave can also be used to distinguish the type of transmission medium.

[0044] Example 1

[0045] The present application provides a method for supervising rivers and lakes, which is used to supervise fishing and blasting activities in rivers and lakes. A first position and a second position are set on the same waterside in a shallow water area of ​​a river or lake. The first position and the second position are a fixed distance apart. In practice, the distance between the first position and the second position can be set as needed, and this application does not limit it.

[0046] Figure 1 This is a flow chart of a method for river and lake supervision provided by an embodiment of the present invention. Figure 1 , specifically including:

[0047] S1, set a first preset time and a second preset time, and enter a first time counting at the first position and the second position respectively.

[0048] S2, judge whether the first time counting exceeds the first preset time at the first position and the second position respectively, and if yes, update the second preset time, the real-time sound speed in water and in air, and re-perform the first time counting, and update the second preset time and the real-time sound speed in real time during the monitoring process.

[0049] In the present application, there is a certain detection monitoring range at the first position and the second position, and the longest time for the blasting signal to propagate from the farthest position that can be detected to the first position or the second position is taken as the standard for judging whether a signal is within the detection radius, so the second preset time is set as the longest time. The farthest length that can be detected is defined as the detection radius.

[0050] In addition, during the propagation of sound, the propagation speed will change due to the influence of temperature, so a fixed time is preset, and when the fixed time, i.e. the first preset time, is exceeded, the value of the second preset time is updated in real time to minimize the error.

[0051] Here, the first preset time is not specifically limited and can be set according to actual conditions.

[0052] The temperature in water and the temperature in air are obtained at the first position and the second position, and the sound propagation speed in air and in water is corrected by the real-time temperature, specifically, the second preset time at the first position and the second position is calculated by the following formula:

[0053] ,

[0054] wherein, is the second preset time, R is the detection radius, is the real-time sound speed in air.

[0055] The real-time sound speed in air at the first position and the second position is calculated by the following formula:

[0056] ,

[0057] wherein, is the sound speed in air at zero Celsius 331.4 m / s, and Tem1 is the real-time air temperature collected at the first position or the second position. Exemplarily, Tem1 can be obtained by a temperature sensor; the setting of the first preset time and the second preset time can be realized by a timer, which is not limited in the present application.

[0058] The real-time sound speed in water at the first position and the second position Calculated using the following formula:

[0059] ,

[0060] Among them, Tem3 is the water temperature at the first position or the second position collected in real time.

[0061] S3. Acquire the first underwater acoustic time domain signal at the first position and the second position, respectively, and determine whether the first acoustic time domain signal contains the blasting feature. If so, record the corresponding first acoustic time domain signal as the first blasting feature signal and the moment of receiving the first blasting feature signal, and enter the second timing. If not, enter S3.

[0062] The timing starts when the first first blasting characteristic signal is detected. If the second preset time is exceeded, it is considered that the device is not within the detection range of the first position or the second position, and no operation is performed on the collected signal, and the process re-enters S3.

[0063] Repeatedly determine whether the first acoustic time domain signal containing the explosion feature is received. If not received, repeat the determination.

[0064] In one embodiment, the underwater first time domain signal may be collected by an underwater transducer.

[0065] The acoustic signal in the water is collected first because the speed of sound on the earth is greater than the speed of sound in water, and the speed of sound in water is greater than the speed of sound in air. Therefore, the signal is received faster in the water, and the acoustic signal transmitted in the air arrives the slowest. The second timing starts with the receipt of the first time domain signal containing the explosion characteristic signal in the water and ends with the receipt of the explosion characteristic signal in the air.

[0066] Because explosive sounds have highly recognizable characteristics in both the time and frequency domains, determining whether the first time domain signal contains explosive characteristic signals includes the following steps: performing digital signal processing on the first acoustic time domain signal to obtain a processed first acoustic time domain signal and a first frequency domain signal; and performing feature extraction on the processed first acoustic time domain signal and first frequency domain signal to determine whether they contain explosive characteristics.

[0067] Feature extraction, including denoising and transformation operations, is a prior art and will not be elaborated in this application. In practice, AI analysis can be used to determine whether the extracted signal contains a burst characteristic signal, which is also a prior art and will not be elaborated in this application.

[0068] S4. Continuously acquire the first underwater acoustic time domain signal at the first position and the second position, respectively, and acquire the second airborne acoustic time domain signal in real time, and determine whether the second timing time exceeds the second preset time. If so, stop the second timing and enter S3; if not, enter S5.

[0069] When an explosion occurs in water, the sound signal propagation media mainly include water, earth and air. When propagating in the medium, the sound waves will experience reflection, projection, refraction and other phenomena. The same sound signal may also penetrate different media and form different sound signals reaching the first position and the second position.

[0070] The received signal needs to be judged. If it exceeds the second preset time, it is considered to be beyond the detection range and no processing is performed.

[0071] The detection radius at the first position and the detection radius at the second position can be the same or different, and are set according to the actual width of the lake or river to be detected, etc. This application does not make any specific restrictions.

[0072] S5. At the first position and the second position, respectively, determine whether the second acoustic time domain signal contains a blast feature. If so, record the corresponding second acoustic time domain signal as the second blast feature signal and the time of receiving the second blast feature signal, and enter S6. If not, determine whether the currently acquired first acoustic time domain signal contains a blast feature. If so, record the corresponding first acoustic time domain signal as the first blast feature signal and the time of receiving each first blast feature signal in sequence, and enter S4. If not, directly enter S4.

[0073] The method for judging the blasting characteristic signal is the same as before and will not be elaborated here.

[0074] The collection of the second blast characteristic signal is regarded as the end point of the loop, thereby entering S6, because the speed of sound propagation in the air is the slowest and it arrives last.

[0075] Because reflection, projection and other phenomena may occur in the water, and the signal may also be refracted to the ground, the first time domain signal with different signal strength, signal loss status, arrival time, etc. may be received in the water.

[0076] S6. Calculate the first distance between the first position and the blasting point and the second distance between the second position and the blasting point based on the second blasting characteristic signal at the first position and the second position, the first blasting characteristic signal, and the receiving time, determine the position of the blasting point based on the first distance and the second distance, and issue an alarm.

[0077] Specifically, the method includes the following steps:

[0078] S61, judging whether the blasting point is located in water based on each first blasting characteristic signal recorded at the first position or the second position, if so, proceeding to S62; if not, proceeding to S64;

[0079] In one embodiment, a method for determining whether a blasting point is located in water is as follows: first blasting characteristic signals recorded at the first position or the second position are sorted according to their time domain amplitudes, the first blasting characteristic signal with the largest amplitude is obtained and recorded as M1, and the first blasting characteristic signal with the second largest amplitude is obtained and recorded as M2; if M1 ≥ 2 M2, the blasting point is determined to be in water; otherwise, it is determined to be in non-water area.

[0080] S62. At the first position and the second position, a first distance between the first position and the blasting point and a second distance between the second position and the blasting point are calculated based on the real-time sound speed in water and air, the reception time of the second blasting characteristic signal, and the reception time of the first blasting characteristic signal with the largest amplitude.

[0081] The real-time speed calculation formula for the speed of sound in the air at the first position or the second position has been explained above and will not be repeated here.

[0082] In one embodiment, when the blasting point is in water, the first distance between the first position and the blasting point is Calculated by the following formula:

[0083] ,

[0084] in, is the receiving time of the second blasting characteristic signal at the first position, is the receiving time of the first blasting characteristic signal with the largest amplitude in the time domain at the first position.

[0085] When the blasting point is in water, the second distance between the second position and the blasting point Calculated by the following formula:

[0086] ,

[0087] in, is the receiving time of the second blasting characteristic signal at the second position, is the receiving time of the first blasting characteristic signal with the largest time domain amplitude at the second position.

[0088] S63, determining the location of the blasting point based on the first distance and the second distance; reporting the location of the blasting point and the blasting type as underwater blasting, and issuing an underwater blasting alarm;

[0089] Specifically, a circle is drawn with the first location as the center and the first distance as the radius; a circle is drawn with the second location as the center and the second distance as the radius, resulting in two circles. If the two circles intersect, the blasting point is located at the intersection in the water. If the two circles do not intersect, an error is determined, or the blasting point is located on the shortest line connecting the two circles.

[0090] In summary, the calculation and judgment process of a blasting point in water is completed.

[0091] S64. At the first position and the second position, a third distance between the first position and the blasting point and a fourth distance between the second position and the blasting point are calculated based on the real-time sound speed in water and air, the sound speed of the formation, the reception time of the second blasting characteristic signal, and the reception time of the first blasting characteristic signal with the largest amplitude.

[0092] The real-time speed calculation formula for the speed of sound in the air at the first position or the second position has been explained above and will not be repeated here.

[0093] The sound velocity of the formation can be set according to the actual local formation sound velocity, and this application does not limit it.

[0094] In one embodiment, when the blasting point is not in water, the third distance between the first position and the blasting point is Calculated by the following formula:

[0095] ,

[0096] in, is the speed of sound in the formation.

[0097] The explosion point is not in water, the fourth distance between the second position and the explosion point Calculated by the following formula:

[0098] .

[0099] S65. Determine the location of the blasting point based on the third distance and the fourth distance; report the location of the blasting point and the blasting type as ground blasting, and issue a ground blasting alarm.

[0100] Specifically, a circle is drawn with the first position as the center and the third distance as the radius, and a circle is drawn with the second position as the center and the fourth distance as the radius, to obtain two circles;

[0101] River and lake supervision also includes shoreline management, so further analysis of ground blasting near the shoreline is needed.

[0102] Specifically, a circle is drawn with the first position as the center and the third distance as the radius, and a circle is drawn with the second position as the center and the fourth distance as the radius, to obtain two circles;

[0103] Among them, in the case where both intersection points of the two circles are on the ground, it is necessary to continue to judge and analyze at which waterside the intersection point the blasting point is located.

[0104] Determine whether one of the intersection points of the two circles is in the water. If so, it is considered that the blasting point is located at the intersection point of the circles away from the water bank. If not, determine whether the difference in reception time of any two first blasting characteristic signals at the first position or the second position is greater than or equal to the ratio of the third distance or the fourth distance to the real-time sound speed in the water. If so, it is considered that the blasting point is located at the intersection point of the circles at the first position away from the water bank, that is, on the water bank side where the first position is not; if not, it is considered that the blasting point is located at the intersection point of the circles at the first position close to the water bank, that is, on the water bank side where the first position is located.

[0105] Based on the above technical solution, the present application sets a first position and a second position on the same waterside, collects time domain signals in water and air at the first position and the second position at the same time, determines whether the collected time domain signals have blasting characteristic signals, and then calculates the distance between the first position and the blasting point and the distance between the second position and the blasting point based on the time when the blasting characteristic signal is received to determine the exact location of the blasting point, and issues an alarm, thereby reducing the amount of calculation and facilitating its popularization and use in real life.

[0106] The present application improves time efficiency by setting a second preset time to limit the acoustic signals that can be received in the air and water after an explosion occurs; and updates the second preset time in real time by monitoring temperature changes over a certain period of time, thereby reducing the impact of temperature on the speed of sound and improving calculation accuracy and speed.

[0107] Example 2

[0108] Based on the content of Example 1, this application provides a specific implementation method:

[0109] A key illegal blasting monitoring section of a river has a cross-section width of 500m and an east-west flow direction. Positions 1 and 2 are set up 500m apart on the south bank of the river. Position 1 is located west of position 2 to monitor fishing and blasting in this section. The velocity of sound in the formation of this section is V e =3500m / s.

[0110] Set the detection radius R = 1000m, the first preset time is 60 minutes, and collect air temperature data every 60 minutes to calibrate the second preset time; collect underwater and air acoustic time domain signals in real time at the first and second positions for digital signal processing, and extract features from the underwater and air acoustic time domain signals to determine whether a signal with blasting characteristics is received. If not, continue to collect data in a loop and perform data analysis;

[0111] At 13:30:40.146754, i.e., 13:30:40 146 milliseconds 754 microseconds, the first underwater acoustic time domain signal was collected at the first position. After digital signal processing, feature extraction, and AI analysis, it was determined that the first blasting characteristic signal was received. The reception time of the first blasting characteristic signal was recorded as t 1A =13:30:40.146754, that is, 13:30:40 146 milliseconds 754 microseconds, and collect the second acoustic time domain signal in real time for digital signal processing, feature extraction and AI analysis, at T 1A =13:30:41.482793, that is, the second blasting characteristic signal was received at 13:30:41 seconds 482 milliseconds 793 microseconds. Before that, the first blasting characteristic signal was received and recorded 6 times in total.

[0112] The second position is at t 1B =13:30:40.164379, that is, the first blasting characteristic signal was received at 13:30:40, 164 milliseconds, 379 microseconds; 1B =13:30:41.660869, that is, the second blasting characteristic signal was collected at 13:30:41, 660 milliseconds, 869 microseconds. Before that, the first blasting characteristic signal was received and recorded underwater a total of 6 times.

[0113] After receiving the time domain signal with blasting characteristics at both locations, the explosion point calculation step is entered. The real-time data of air and water are collected at 25°C and 20°C respectively. The real-time sound speed in air is calibrated to 346.4m / s and the real-time sound speed in water is V w =1480.3m / s;

[0114] The first blasting characteristic signal collected at the first location is sorted by time domain amplitude. The characteristic signal received at 13:30:40.388654, that is, at 13:30:40, 388 milliseconds, 654 microseconds, is twice the strength of other signals. This proves that the signal at this moment is a direct signal that propagated linearly through the water to reach the first location without being significantly weakened by transmission, refraction, etc., and it is determined that the blasting point is located in the water; see Figure 2 The distance between the blasting point and the first position, point A, is S A =513.6m, the distance between the blasting point and the second position, point B, is S B =575.3m; respectively S A 、S B Draw a circle with point A and point B as the radius, and the two circles intersect at two points. Among them, the intersection point located in the water area is the blasting point. Report the blasting within the river and lake supervision area, report the location where the blasting occurred, and report the blasting type as underwater blasting.

[0115] Example 3

[0116] The present application provides an electronic device, which includes: a processor and a memory; the processor is used to execute the steps of the method in Example 1 by calling a program or instruction stored in the memory.

[0117] Example 4

[0118] The present application provides a computer-readable storage medium, which stores a program or instruction. The program or instruction enables a computer to execute the steps of the method in Example 1.

[0119] It should be noted that the terms used in the present invention are only for describing specific embodiments and are not intended to limit the scope of this application. As shown in the present specification, unless the context clearly indicates an exception, the words "one", "a", "a kind of" and / or "the" do not specifically refer to the singular and may also include the plural. The terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method or device comprising a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method or device. In the absence of further restrictions, the elements defined by the sentence "comprise a..." do not exclude the presence of other identical elements in the process, method or device comprising the elements.

[0120] It should also be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. A method for supervising river and lake activities, for supervising fishing and blasting in rivers and lakes, characterized in that: On the same bank side of a shallow water area of ​​a river or lake, a first position and a second position are set, wherein the first position and the second position are a fixed distance apart; The method comprises the following steps: S1. Setting a first preset time and a second preset time, and entering the first timing at the first position and the second position respectively; S2. At the first position and the second position, respectively, determining whether the first timing time exceeds the first preset time; if so, updating the second preset time, the real-time sound speed in water and in the air, and re-calculating the first timing, and performing real-time cyclic updates on the second preset time and the real-time sound speed during the monitoring process; S3. Acquire a first underwater acoustic time domain signal at the first position and the second position, respectively, and determine whether the first acoustic time domain signal contains a blasting feature. If so, record the corresponding first acoustic time domain signal as a first blasting feature signal and the time of receiving the first blasting feature signal, and enter a second timing. If not, enter S3. S4. Continuously acquiring a first underwater acoustic time-domain signal at the first position and a second airborne acoustic time-domain signal at the second position, respectively, and determining whether a second timing time exceeds a second preset time. If so, the second timing is stopped and the process proceeds to S3; if not, the process proceeds to S5. S5. At the first position and the second position, respectively, determine whether the second acoustic time domain signal contains a burst feature. If so, record the corresponding second acoustic time domain signal as a second burst feature signal and the time of receiving the second burst feature signal, and proceed to S6. If not, determine whether the currently acquired first acoustic time domain signal contains a burst feature. If so, sequentially record the corresponding first acoustic time domain signal as a first burst feature signal and the time of receiving each first burst feature signal, and proceed to S4. If not, directly proceed to S4. S6. Calculate a first distance between the first position and the blasting point and a second distance between the second position and the blasting point based on the second blasting characteristic signal at the first position and the second position, the first blasting characteristic signal, and the reception time, determine the position of the blasting point based on the first distance and the second distance, and issue an alarm.

2. A method for river and lake supervision according to claim 1, characterized in that: In S3, determining whether the first acoustic time domain signal has a burst feature includes the following steps: performing digital signal processing on the first acoustic time domain signal to obtain a processed first acoustic time domain signal and a first frequency domain signal; and performing feature extraction on the processed first acoustic time domain signal and the first frequency domain signal to determine whether the signal contains a burst feature.

3. A method for river and lake supervision according to claim 1, characterized in that: The second preset time at the first position and the second preset time at the second position are both calculated by the following formula: ， in, is the second preset time, R is the detection radius, is the real-time speed of sound in the air, , is the speed of sound in space at zero degrees Celsius, and Tem1 is the air temperature collected in real time at the first position or the second position.

4. A method for river and lake supervision according to claim 1, characterized in that: In S6, based on the second blasting characteristic signals at the first position and the second position, the first blasting characteristic signal, and the reception time, a first distance between the first position and the blasting point and a second distance between the second position and the blasting point are calculated respectively, the position of the blasting point is determined based on the first distance and the second distance, and an alarm is issued, which specifically includes the following steps: S61, judging whether the blasting point is located in water based on each first blasting characteristic signal recorded at the first position or the second position, if so, proceeding to S62; if not, proceeding to S64; S62. At the first position and the second position, a first distance between the first position and the blasting point and a second distance between the second position and the blasting point are calculated based on the real-time sound speed in water and air, the reception time of the second blasting characteristic signal, and the reception time of the first blasting characteristic signal with the largest amplitude. S63, determining the location of the blasting point based on the first distance and the second distance; reporting the location of the blasting point and the blasting type as underwater blasting, and issuing an underwater blasting alarm; S64. Calculate, at both the first position and the second position, a third distance between the first position and the blasting point and a fourth distance between the second position and the blasting point based on the real-time sound speed in water and air, the sound speed of the formation, the reception time of the second blasting characteristic signal, and the reception time of the first blasting characteristic signal with the largest amplitude; S65. Determine the location of the blasting point based on the third distance and the fourth distance; report the location of the blasting point and the blasting type as ground blasting, and issue a ground blasting alarm.

5. A method for river and lake supervision according to claim 4, characterized in that: In S61, judging whether the blasting point is located in water according to each first blasting characteristic signal recorded at the first position or the second position specifically includes: The first blasting characteristic signals recorded at the first position or the second position are sorted according to the time domain amplitude, and the first blasting characteristic signal with the largest amplitude is obtained and recorded as M1 and the first blasting characteristic signal with the second largest amplitude is recorded as M2. If M1 ≥ 2 M2, it is determined that the blasting point is in water.

6. A method for river and lake supervision according to claim 4, characterized in that: In S63, determining the location of the blasting point according to the first distance and the second distance specifically includes: Draw a circle with the first position as the center and the first distance as the radius; draw a circle with the second position as the center and the second distance as the radius to obtain two circles; if there is an intersection between the two circles, the blasting point is located at the intersection in the water.

7. A method for river and lake supervision according to claim 4, characterized in that: In S65, determining the location of the blasting point according to the third distance and the fourth distance includes: Draw a circle with the first position as the center and the third distance as the radius, and draw a circle with the second position as the center and the fourth distance as the radius, to obtain two circles; Determine whether one of the intersection points of the two circles is in the water. If so, it is considered that the blasting point is located at the intersection point of the circles away from the water bank. If not, determine whether the difference in reception time of any two first blasting characteristic signals at the first position or the second position is greater than or equal to the ratio of the third distance or the fourth distance to the real-time sound speed in the water. If so, it is considered that the blasting point is located at the intersection point of the circles at the first position away from the water bank. If not, it is considered that the blasting point is located at the intersection point of the circles at the first position close to the water bank.

8. An electronic device, characterized in that: The electronic device comprises: processor and memory; The processor is configured to execute the steps of the method according to any one of claims 1 to 7 by calling the program or instructions stored in the memory.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a program or instruction, and the program or instruction enables a computer to execute the steps of the method according to any one of claims 1 to 7.

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