River and lake supervision method

Abstract

The invention relates to the technical field of river and lake monitoring, and provides a river and lake monitoring method, which comprises the following steps of: setting a first position and a second position on the same water bank side, simultaneously acquiring time domain signals in water and air at the first position and the second position, judging whether the acquired time domain signals have blasting characteristic signals or not, and if yes, judging whether the blasting characteristic signals exist or not; the distance between the first position and the blasting point and the distance between the second position and the blasting point are calculated according to the moment when the signal with the blasting characteristic is received, so that the accurate position of the blasting point is determined, the calculation amount is reduced, and popularization and use in actual life are facilitated; by setting the second preset time, acoustic signals which can be received in the air and in the water after one-time blasting are limited, and the time efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of river and lake supervision, and in particular to a method for river and lake supervision. Background Art

[0002] The supervision of rivers and lakes includes the four chaos, illegal sewage discharge, electric and poisonous fishing, blasting, etc. With the rapid development of information, remote sensing, video, AI, Beidou high-precision positioning and other technologies, significant progress has been made in monitoring methods for the four chaos, such as illegal sand mining, illegal occupation, illegal stacking, illegal sewage discharge, and electric fishing; however, due to the long management scope, illegal behaviors are carried out quickly and covertly, illegal fishing and illegal blasting are difficult to supervise and monitor. In most cases, supervision can only rely on public reports.

[0003] The common characteristics of illegal fishing and illegal blasting are blasting and explosion, which are often achieved through aerial acoustic arrays, high-speed photography, photoelectric measurement and other methods; among them, the aerial array has a more complex structure and high cost, and is not suitable for popularization and use; due to the concealed nature of illegal fishing and illegal blasting operations in river and lake supervision, high-speed photography and photoelectric measurement methods are difficult to monitor and are not suitable for river and lake supervision.

[0004] In order to further improve the supervision capabilities of rivers and lakes, it is urgent to propose a method for real-time monitoring of illegal fishing and blasting behaviors to solve the above problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a method for river and lake supervision, which monitors fishing and blasting activities within the management scope of rivers, lakes and reservoirs, and automatically reports the scope of the explosion area.

[0006] In a first aspect, the present invention provides a river and lake supervision method for supervising blasting and blasting in rivers and lakes, wherein a first position and a second position are set on the same waterside of a shallow water area of ​​a river or lake, and the first position and the second position are at a fixed distance from each other; 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 determine whether the first timing time exceeds the first preset time, if it exceeds, update the second preset time, the real-time sound speed in water and in the air, and re-time the first timing, and perform real-time cyclic update of the second preset time and the real-time sound speed in the supervision process; S3, at the first position and the second position, respectively obtain the first acoustic time domain signal underwater, 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 receiving time of the first blasting feature signal, and enter the second timing; if not, enter S3; S4, at the first position and the second position, respectively, continuously obtain the first acoustic time domain signal underwater, and obtain the second acoustic time domain signal in the air in real time, and determine whether the second timing time exceeds the second preset time. If so, the second timing is stopped and the process goes to S3; if not, the process goes 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 the second burst feature signal and record the receiving time of the second burst feature signal, and enter S6; if not, determine whether the currently acquired first acoustic time domain signal contains a burst feature, if so, record the corresponding first acoustic time domain signal as the first burst feature signal and the receiving time of each first burst feature signal in sequence, and enter S4; if not, directly enter S4; 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 according to 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 according to the first distance and the second distance, and issue an alarm.

[0007] Further, in S3, determining whether the first acoustic time domain signal has a burst feature comprises 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; performing feature extraction on the processed first acoustic time domain signal and the first frequency domain signal to determine whether a burst feature is contained.

[0008] Furthermore, the second preset time at the first position and 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.

[0009] Further, in S6, according to the second blasting characteristic signal at the first position and the second position, the first blasting characteristic signal and the receiving 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 according to 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 according to 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 in air, the receiving time of the second blasting characteristic signal and the receiving time of the first blasting characteristic signal with the largest amplitude; S63, determining the location of the blasting point according to 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, 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 stratum, 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 according to 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.

[0010] Further, 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≥2M2, it is determined that the blasting point is in the water.

[0011] Further, in S63, the position of the blasting point is determined according to the first distance and the second distance, specifically including: 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 location of the blasting point is the intersection in the water.

[0012] Further, in S65, determining the position 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 far away from the water bank. If not, it is determined whether the difference in receiving 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 far 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.

[0013] In a second aspect, the present invention provides an electronic device, the electronic device comprising: Processor and memory; 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.

[0014] In a third aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a program or instruction, wherein the program or instruction enables a computer to execute the steps of the method of the first aspect.

[0015] The present invention has the following technical effects: 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 according to the time when the blasting characteristic signal is received to determine the accurate position of the blasting point, and issues an alarm, which reduces the amount of calculation and is conducive to popularization and use in real life; 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

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 is a flow chart of a method for river and lake supervision provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the locations of blasting points for river and lake supervision provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0019] First, explain the following: 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, there are natural phenomena such as reflection, transmission, and refraction when sound propagates between different media. For example, sonic logging is used in surveying work, and there is loss when sound propagates in the same medium. There is a large amount of energy loss when sound propagates at the interface between different media. Within the regulatory scope of rivers and lakes, sound will propagate through media such as the 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.

[0020] Example 1 The present application provides a method for supervising rivers and lakes, which is used to supervise blasting and blasting activities in rivers and lakes. A first position and a second position are set on the same waterside of 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 the present application does not limit it.

[0021] Figure 1 is a flow chart of a method for river and lake supervision provided by an embodiment of the present invention. Figure 1 , specifically including: S1. Set a first preset time and a second preset time, and enter the first timing at the first position and the second position respectively.

[0022] S2. At the first position and the second position, determine whether the first timing time exceeds the first preset time respectively. If it exceeds, update the second preset time, the real-time sound speed in water and in the air, and re-time the first timing. The second preset time and the real-time sound speed in the supervision process are updated in real time and cycle.

[0023] In the present application, both the first position and the second position have a certain detection and supervision range, and the longest time for the blasting signal to propagate from the farthest detectable position to the first position or the second position is used as a criterion for judging whether a signal is within the detection radius, so the second preset time is set as the maximum time. The farthest detectable length is defined as the detection radius.

[0024] In addition, during the propagation of sound, the propagation speed will change due to the influence of temperature, so a fixed time is preset. When the fixed time is exceeded, that is, the first preset time, the value of the second preset time is updated in real time to minimize the error.

[0025] There is no specific limitation on the first preset time here, and it can be set according to actual conditions.

[0026] The temperature in the water and the temperature in the air are obtained at both the first position and the second position, and the sound propagation speed in the air and in the 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: , in, is the second preset time, R is the detection radius, is the real-time speed of sound in the air.

[0027] Real-time speed of sound in the air at the first position and the second position The calculation is done by the following formula: , in, is the speed of sound in space at zero degrees Celsius, 331.4 m / s, and Tem1 is the air temperature collected in real time at the first position or the second position. For example, 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 this application.

[0028] Real-time sound speed in water at the first position and the second position The calculation is done by the following formula: , Among them, Tem3 is the water temperature at the first position or the second position collected in real time.

[0029] 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 reception time of the first blasting feature signal, and enter the second timing. If not, enter S3.

[0030] When the first blasting characteristic signal is detected, the timing starts. 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.

[0031] Repeat the process of determining whether the first acoustic time domain signal containing the explosion feature is received. If the first acoustic time domain signal is not received, the determination is repeated.

[0032] In one embodiment, the underwater first time domain signal may be collected by an underwater transducer.

[0033] 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 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.

[0034] Since the blasting sound has highly recognizable features in both the time domain and the frequency domain, determining whether the first time domain signal contains a blasting feature signal 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; performing feature extraction on the processed first acoustic time domain signal and the first frequency domain signal to determine whether they contain blasting features.

[0035] Feature extraction including denoising and transformation operations are all prior art, and this application will not elaborate on them. In practice, AI analysis can be used to determine whether the signal after feature extraction contains a burst feature signal, which is also prior art and this application will not elaborate on it.

[0036] S4. At the first position and the second position, respectively, continuously acquire the first acoustic time domain signal underwater, and acquire the second acoustic time domain signal in the air in real time, and determine whether the second timing time exceeds the second preset time. If so, the second timing is stopped and enters S3; if not, enters S5.

[0037] When an explosion occurs in water, the propagation media of the sound signal 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, forming different sound signals to reach the first position and the second position.

[0038] The received signal needs to be judged. If it exceeds the second preset time, it is considered to exceed the detection range and no processing is performed.

[0039] The detection radius at the first position and the detection radius at the second position may be the same or different, and are set according to the width of the lake or river to be detected in practice, etc., and this application does not make any specific limitation.

[0040] 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 record the receiving time of the second burst feature signal, and enter S6; if not, determine whether the first acoustic time domain signal currently obtained contains a burst feature. If so, record the corresponding first acoustic time domain signal as a first burst feature signal and the receiving time of each first burst feature signal in sequence, and enter S4; if not, directly enter S4.

[0041] The method for judging the characteristic signal of blasting is the same as before and will not be elaborated here.

[0042] 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.

[0043] Because reflection, projection and other phenomena will occur in the water, and it will also be refracted to the ground, so the first time domain signal with different signal strength, signal loss status, arrival time, etc. can be received in the water.

[0044] 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 according to 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 according to the first distance and the second distance, and issue an alarm.

[0045] Specifically, the steps include: 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, if so, proceeding to S62; if not, proceeding to S64; In one embodiment, a method for determining whether a blasting point is located in water is as follows: sorting the first blasting characteristic signals recorded at the first position or the second position according to the time domain amplitude, obtaining the first blasting characteristic signal with the largest amplitude and recording its amplitude as M1 and the first blasting characteristic signal with the second largest amplitude and recording its amplitude as M2; if M1≥2M2, it is determined that the blasting point is in water, otherwise it is in non-water area.

[0046] 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 in air, the receiving time of the second blasting characteristic signal and the receiving time of the first blasting characteristic signal with the largest amplitude; 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 before and will not be repeated here.

[0047] 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: , 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.

[0048] When the blasting point is in water, the second distance between the second position and the blasting point Calculated by the following formula: , 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 amplitude in the time domain at the second position.

[0049] S63, determining the location of the blasting point according to 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; Specifically, a circle is drawn with the first position as the center and the first distance as the radius; a circle is drawn with the second position as the center and the second distance as the radius, and two circles are obtained; if there is an intersection between the two circles, the location of the blasting point is located at the intersection in the water. If there is no intersection between the two circles, it is determined that an error occurs, or the location of the blasting point is located on the shortest line between the two circles.

[0050] In summary, the calculation and judgment process of a blasting point in water is completed.

[0051] 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 stratum, the reception time of the second blasting characteristic signal and the reception time of the first blasting characteristic signal with the largest amplitude.

[0052] 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 before and will not be repeated here.

[0053] The sound velocity of the formation can be set according to the actual local formation sound velocity, and this application does not limit it.

[0054] 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: , in, is the speed of sound in the formation.

[0055] The explosion point is not in the water, the fourth distance between the second position and the explosion point Calculated by the following formula: .

[0056] S65. Determine the location of the blasting point according to 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.

[0057] 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; River and lake supervision also includes shoreline management, so further analysis of ground blasting near the shoreline is needed.

[0058] 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; Among them, for the situation where both intersection points of the two circles are on the ground, it is necessary to continue to judge and analyze on which waterside the intersection point the blasting point is located.

[0059] 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 far away from the water bank. If not, it is determined whether at the first position or the second position, the difference in the receiving time of any two first blasting characteristic signals 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 far 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.

[0060] 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 according to the time when the blasting characteristic signal is received to determine the accurate position of the blasting point, and issues an alarm, which reduces the amount of calculation and is conducive to popularization and use in real life; 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.

[0061] Example 2 Based on the content of Example 1, this application provides a specific implementation method: A key illegal blasting monitoring section of a river has a cross-sectional width of 500m and an east-west runoff direction. The first and second positions are set at 500m intervals on the south bank of the river. The first position is located to the west of the second position to monitor the fishing and blasting in this section. The stratum sound velocity in this section is V e =3500m / s.

[0062] Set the detection radius R=1000m, the first preset time is 60min, and collect the temperature data in the air every 60min, and calibrate the second preset time; collect the acoustic time domain signals underwater and in the air in real time at the first position and the second position for digital signal processing, and extract the features of the acoustic time domain signals underwater and in the air to determine whether a signal with blasting characteristics is received, if not, continue to collect data in a loop and perform data analysis; At 13:30:40.146754, i.e., 13:30:40 146 milliseconds 754 microseconds, the first underwater acoustic time domain signal is collected at the first position. After digital signal processing, feature extraction and AI analysis, it is determined that the first blasting characteristic signal is received. The receiving time of the first blasting characteristic signal is 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. 1A =13:30:41.482793, i.e. the second blasting characteristic signal was received at 13:30:41, 482 milliseconds, 793 microseconds. Prior to this, the first blasting characteristic signal was received and recorded six times in total.

[0063] The second position is at t 1B =13:30:40.164379, i.e., the first blast characteristic signal was received at 13:30:40 164 milliseconds 379 microseconds; 1B =13:30:41.660869, i.e. the second blasting characteristic signal was collected at 13:30:41, 660 milliseconds, 869 microseconds. Prior to this, the first blasting characteristic signal was received and recorded underwater a total of 6 times.

[0064] After receiving the time domain signals with explosion characteristics at both locations, the explosion point calculation step is entered. The real-time data of air and water are collected at 25℃ and 20℃ respectively. The real-time sound speed in the air is calibrated to 346.4m / s and the real-time sound speed in the water is V w =1480.3m / s; The first blasting characteristic signal collected at the first position is sorted according to the 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, proving that the signal at this moment is a direct signal that propagates in a straight line in the water to reach the first position without being greatly weakened by transmission, refraction, etc., and it is judged 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. 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.

[0065] Example 3 The present application provides an electronic device, which includes: a processor and a memory; the processor calls a program or instruction stored in the memory to execute the steps of the method in Example 1.

[0066] Example 4 The present application provides a computer-readable storage medium, which stores a program or instruction, and the program or instruction enables a computer to execute the steps of the method in Example 1.

[0067] It should be noted that the terms used in the present invention are only for describing specific embodiments, rather than limiting the scope of the present 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, but may also include the plural. The terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method or device including 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 more restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method or device including the elements.

[0068] It should also be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the 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.

[0069] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by 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 blasting 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 at a fixed distance from each other; 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 determine whether the time of the first timing exceeds the first preset time. If it exceeds, update the second preset time, the real-time sound speed in water and in the air, and re-time the first timing, and perform real-time cyclic update of the second preset time and the real-time sound speed during the supervision process; S3, at the first position and the second position, respectively obtain the first acoustic time domain signal underwater, 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; S4, at the first position and the second position, respectively, continuously acquiring the first acoustic time domain signal underwater, and acquiring the second acoustic time domain signal in the air in real time, and determining whether the second timing time exceeds the 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 record the receiving time of the second burst feature signal, and enter S6; if not, determine whether the first acoustic time domain signal currently obtained contains a burst feature, if so, record the corresponding first acoustic time domain signal as a first burst feature signal and the receiving time of each first burst feature signal in sequence, and enter S4; if not, directly enter S4; 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 respectively according to 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 according to 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; performing feature extraction on the processed first acoustic time domain signal and the first frequency domain signal to determine whether a burst feature is included.

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, according to the second blasting characteristic signals at the first position and the second position, the first blasting characteristic signal and the receiving time, respectively calculating the first distance between the first position and the blasting point and the second distance between the second position and the blasting point, determining the position of the blasting point according to the first distance and the second distance, and issuing an alarm, specifically comprising the following steps: 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, 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 in air, the receiving time of the second blasting characteristic signal and the receiving time of the first blasting characteristic signal with the largest amplitude; S63, determining the location of the blasting point according to 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, 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 stratum, 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 according to 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≥2M2, it is determined that the blasting point is in the water.

6. A method for river and lake supervision according to claim 4, characterized in that: In S63, determining the position 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 location of the blasting point is the intersection in the water.

7. A method for river and lake supervision according to claim 4, characterized in that: In S65, determining the position 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 far away from the water bank. If not, it is determined whether the difference in receiving 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 far 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 used to execute the steps of the method according to any one of claims 1 to 7 by calling the program or instruction stored in the memory.

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

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