Grassland rodent damage monitoring method and system based on magnetic field detection

Abstract

The invention provides a grassland rodent damage monitoring method and system based on magnetic field detection, and relates to the technical field of rodent damage detection. The method comprises the steps that a magnet and a spring pedal assembly are arranged; a first relation function between the mass of an object borne by the spring pedal assembly and the induction current is determined; detecting an induced current; according to the first relation function, target induction current generated when the murine animal treads on the spring pedal assembly is screened out; and determining a serial number of a spring pedal assembly corresponding to the target induction current and a target moment of the target induction current, and determining a grassland rodent damage condition score. According to the device and the method, mouse activities can still be monitored when the terrain is blocked, the environmental adaptability of mouse damage monitoring is improved, the cost is low, large-area laying is facilitated, data generated during mouse treading can be screened based on the first relation function between the spring pedal assembly and the induction current, and the accuracy of mouse damage monitoring is improved. The interference of treading of other animals on the monitoring result is reduced, and the monitoring accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of rodent damage detection, and in particular to a grassland rodent damage monitoring method and system based on magnetic field detection. Background Art

[0002] In the related art, CN106771718B discloses an experimental device and method for detecting an animal's tendency or preference for an electric field, wherein the experimental device includes: an electric field exposure and control unit, a control unit, and a power supply; the electric field exposure and control unit includes: an insulating cover plate, an upper plate, a bottom plate, and a lower plate installed on an insulating bracket from top to bottom; an electric field shielding plate, suspended and fixed on the insulating cover plate, the electric field shielding plate divides the space between the insulating cover plate and the bottom plate into a mutually symmetrical electric field exposure chamber and a control chamber; the upper plate includes a metal upper plate located in the electric field exposure chamber and a control upper plate located in the control chamber, and the metal upper plate is connected to a power supply; the lower plate includes a metal lower plate opposite to the metal upper plate and a control lower plate opposite to the control upper plate, and the metal lower plate is grounded; the control unit is connected to and controls the power supply. The electric field exposure unit of the device is integrated with the behavioral experiment unit, and an in-situ electric field exposure behavioral experiment can be performed.

[0003] CN104777380B discloses an animal modeling device for simulating electric field exposure of ultra-high voltage direct current transmission lines, including a direct current ion flow generating unit: a corona wire mesh, a control grid and a ground potential plate installed on an insulating support from top to bottom, and the ground potential plate is grounded; an electrostatic field generating unit: a ground potential plate and a plurality of upper plate nets installed on an insulating support and located between the control grid and the ground potential plate and connected in series by wires; a voltage generating and controlling unit: three direct current power supplies respectively connected to the corona wire mesh, the control grid and the upper plate net, and a voltage control unit connected to and controlling the three direct current power supplies; and an animal breeding cage placed on the ground potential plate. The scheme can simultaneously perform animal modeling for exposure to multiple electric field strengths, so that the electric field exposure environment is as close as possible to the electric field environment generated by the actual ultra-high voltage direct current transmission line, effectively carry out animal experiments on electric field exposure of ultra-high voltage direct current transmission lines, and provide certain scientific references for the formulation of corresponding standards.

[0004] Therefore, the related technology can detect rats and other animals based on their reactions to electric fields or magnetic fields. However, the related technology can only detect the reactions of rats and other animals in specific positions in the electric field or magnetic field, but cannot detect the activities of animals when the positions and numbers of rats and other animals are uncertain. In addition, rodent monitoring in other related technologies is usually based on machine vision. However, machine vision equipment is expensive and has difficulty monitoring rodent activities when the field of view is limited (for example, when the ground is uneven and easily blocks rats, or when there is insufficient brightness at night).

[0005] The information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or any form of implication that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0006] The present invention provides a grassland rodent pest monitoring method and system based on magnetic field detection, which can solve the technical problems that the related technology has high cost and it is difficult to monitor rodent activities when the field of vision is limited.

[0007] According to a first aspect of the present invention, there is provided a grassland rodent pest monitoring method based on magnetic field detection, comprising: arranging a plurality of magnets at a plurality of first positions within a preset area in the grassland, wherein the specifications of the plurality of magnets are consistent, and the magnetic pole directions of the plurality of magnets are consistent, and the first positions are evenly distributed within the preset area; arranging a spring pedal assembly at a plurality of second positions within the preset area, wherein the spring pedal assembly comprises an insulating pedal and a spring assembly, the metal wire surface of the spring assembly is coated with an insulating layer, and current sensors are connected to both ends of the metal wire of the spring assembly, and the second position is different from the first position; testing each spring pedal assembly to determine whether the spring pedal assembly is A first relationship function between the mass of the object carried by the plate assembly and the induced current detected by the current sensor; obtaining the induced current detected by the current sensor corresponding to each spring pedal assembly at multiple moments in the current monitoring cycle; screening the induced current according to the first relationship function to determine the target induced current generated when the rodent steps on the spring pedal assembly; determining the serial number of the spring pedal assembly corresponding to the target induced current, and the target moment when the target induced current is detected; determining a grassland rodent infestation status score according to the serial number of the spring pedal assembly corresponding to the target induced current and the target moment; and generating a grassland rodent infestation monitoring report according to the grassland rodent infestation status score.

[0008] According to the present invention, each spring pedal assembly is tested to determine a first relationship function between the mass of an object carried by the spring pedal assembly and the induced current detected by the current sensor, including: determining a motion function of the object when the object exists on the insulating pedal according to design parameters of the spring pedal assembly; determining a maximum vertical movement speed of the object when the object exists on the insulating pedal according to the motion function; and determining a first relationship function between the mass of the object carried by the spring pedal assembly and the induced current detected by the current sensor according to the maximum movement speed.

[0009] According to the present invention, the motion function of the object when there is an object on the insulating pedal is determined based on the design parameters of the spring pedal assembly, including: according to the formula Determine the motion function, where t is a time variable, z(t) is a motion function between the vertical movement distance of the object and time t, z0 is an initial vertical position of the insulating pedal when no object is carried on the insulating pedal, k is an elastic coefficient of the spring assembly, m is the mass of the object, M is the mass of the insulating pedal, and g is the acceleration due to gravity.

[0010] According to the present invention, determining the maximum vertical speed of an object when there is an object on the insulating pedal according to the motion function includes: according to the formula Determine the maximum vertical velocity v of the object max .

[0011] According to the present invention, determining a first relationship function between the mass of the object carried by the spring pedal assembly and the induced current detected by the current sensor according to the maximum movement speed includes: according to the formula Determine the undetermined coefficient equation of the first relationship function between the mass of the object carried by the i-th spring pedal assembly and the induced current detected by the current sensor, where θ 1，i ,θ 2，i ,θ 3，i and θ 4，i is the undetermined coefficient of the first relational function of the i-th spring pedal assembly, I i When the mass of the object carried by the spring pedal assembly is m, the extreme value of the induced current detected by the current sensor; the mass of the object carried by the spring pedal assembly is adjusted multiple times, and the extreme value of the induced current is detected multiple times; according to the masses of multiple objects and the maximum values ​​of multiple induced currents, the undetermined coefficients are solved to obtain the solved values ​​of the undetermined coefficients; according to the solved values ​​of the undetermined coefficients and the undetermined coefficient equation of the first relationship function, the first relationship function is determined.

[0012] According to the present invention, the induced current is screened according to the first relationship function to determine the target induced current generated when a rodent steps on a spring pedal assembly, including: obtaining a preset upper limit and lower limit of the rodent mass; substituting the upper limit and lower limit of the mass into the first relationship function to obtain an upper limit of the induced current extreme value and a lower limit of the induced current extreme value; if it is detected that the extreme value of the induced current is less than or equal to the upper limit of the extreme value of the induced current, and greater than or equal to the lower limit of the extreme value of the induced current, then the induced current is the target induced current.

[0013] According to the present invention, a grassland rodent infestation score is determined based on the serial number of the spring pedal assembly corresponding to the target induced current and the target moment, including: arranging the target moments corresponding to all spring assemblies to obtain a target moment sequence; determining the distance between the spring pedal assemblies corresponding to the target induced current based on the serial number of the spring pedal assembly; and determining the grassland rodent infestation score based on the target moment sequence and the distance between the spring pedal assemblies corresponding to the target induced current.

[0014] According to the present invention, determining the grassland rodent damage status score according to the target moment sequence and the distance between the spring pedal assembly corresponding to the target induced current includes: setting a first preset time length; determining a first number of target moments in a time window with each target moment in the target moment sequence as the starting moment and the first preset time length as the duration; and determining the first number of target moments in a time window with each target moment in the target moment sequence as the starting moment and the first preset time length as the duration according to the formula Determine the grassland rodent damage score S R , where N 1，max is the maximum value of the first number of target moments in the time window, n2 is the number of second positions, ΔD is the distance between adjacent spring pedal assemblies, n1 is the minimum value of the sequence number of the time window including the last target moment in the target moment sequence, N 1，j is the first number of target moments in the time window of the jth target moment, L j，(j+s)-(j+u) is the distance between the spring pedal assembly corresponding to the j+sth target moment and the spring pedal assembly corresponding to the j+uth target moment in the time window of the jth target moment, 0≤s≤N 1，j -1, 0≤u≤N 1，j -1, and n1, n2, N 1，max 、N 1，j , j, s and u are all positive integers.

[0015] According to a second aspect of the present invention, there is provided a grassland rodent monitoring system based on magnetic field detection, comprising: a first setting module, used to set a plurality of magnets at a plurality of first positions within a preset area in the grassland, wherein the specifications of the plurality of magnets are consistent, and the magnetic pole directions of the plurality of magnets are consistent, and the first positions are evenly distributed within the preset area; a second setting module, used to set a spring pedal assembly at a plurality of second positions within the preset area, wherein the spring pedal assembly comprises an insulating pedal and a spring assembly, the metal wire surface of the spring assembly is coated with an insulating layer, and the two ends of the metal wire of the spring assembly are connected to a current sensor, and the second position is different from the first position; a first relationship function module, used to test each spring pedal assembly to determine the load carried by the spring pedal assembly. a first relationship function between the mass of an object and the induced current detected by the current sensor; a detection module, used to obtain the induced current detected by the current sensor corresponding to each spring pedal assembly at multiple moments in the current monitoring cycle; a screening module, used to screen the induced current according to the first relationship function, and determine the target induced current generated when the rodent steps on the spring pedal assembly; a determination module, used to determine the serial number of the spring pedal assembly corresponding to the target induced current, and the target moment when the target induced current is detected; a grassland rodent pest status scoring module, used to determine the grassland rodent pest status score according to the serial number of the spring pedal assembly corresponding to the target induced current and the target moment; a reporting module, used to generate a grassland rodent pest monitoring report according to the grassland rodent pest status score.

[0016] Technical effect: According to the present invention, multiple magnets can be set in a preset area in the grassland to form a magnetic field covering the preset area, and spring pedal assemblies can be set at multiple positions to detect the activities of rodents based on the principle of electromagnetic induction when rodents step on the spring pedal assembly. The magnetic field is less affected by the unevenness of the ground, and monitoring can still be performed when there are obstacles in the terrain, thereby improving the environmental adaptability of rodent monitoring, and the cost is low, which is convenient for large-scale laying. Furthermore, the data generated when rodents step on it can be screened based on the first relationship function between the spring pedal assembly and the induced current, thereby reducing the interference of other animals' stepping on the monitoring results and improving the monitoring accuracy. When determining the movement process of an object on the insulating pedal, the movement process of the object on the insulating pedal can be analyzed, and the motion function of the object can be determined based on the mass of the object, the mass of the insulating pedal, the elastic coefficient of the spring assembly and other parameters, and then the maximum speed of the object in the spring compression process can be solved based on the motion function, thereby providing an accurate data basis for solving the induced current caused by the movement of the spring assembly compressed by the object movement, improving the accuracy of solving the induced current and the accuracy of screening the induced current when the rodents step on the spring pedal assembly. When determining the first relationship function, the relationship between the mass and the maximum movement speed of the object, as well as the relationship between the maximum movement speed and the extreme value of the induced current, can be accurately expressed by the undetermined coefficient equation, so that the first relationship function corresponding to the spring pedal assembly at each second position is determined by solving the undetermined coefficient, thereby describing the relationship between the weight of the object carried on each spring pedal assembly and the extreme value of the induced current. In addition, since the above solution can be performed for each spring pedal assembly, it is not necessary to set a uniform magnetic field in a preset area with a large range, which reduces the difficulty of setting the magnetic field in the preset area. When determining the grassland rodent infestation status score, a time window can be set to exclude the situation where the same rodent steps on different spring pedal assemblies within the time window, thereby improving the accuracy of the grassland rodent infestation status score. In addition, the frequency and activity of rodent activities can be determined based on the maximum number of spring pedal assemblies stepped on by rodents within the time window, and the range of rodent activities can be determined based on the average distance of spring pedal assemblies stepped on by rodents within the time window. The grassland rodent infestation status score can be determined based on both the frequency and range of rodent activities to accurately describe the severity of grassland rodent infestation and improve the accuracy, comprehensiveness and objectivity of the grassland rodent infestation status score.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and do not limit the present invention. Other features and aspects of the present invention will become more apparent from the following detailed description of exemplary embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other embodiments can be obtained based on these drawings without creative work.

[0019] Figure 1 A flowchart of a grassland rodent damage monitoring method based on magnetic field detection according to an embodiment of the present invention is exemplarily shown;

[0020] Figure 2 A schematic diagram of a grassland rodent pest monitoring system based on magnetic field detection according to an embodiment of the present invention is exemplarily shown. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. 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 are within the scope of protection of the present invention.

[0022] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0023] Figure 1A flow chart of a grassland rodent pest monitoring method based on magnetic field detection according to an embodiment of the present invention is exemplarily shown, the method comprising: step S101, setting a plurality of magnets at a plurality of first positions within a preset area in the grassland, wherein the specifications of the plurality of magnets are consistent, and the magnetic pole directions of the plurality of magnets are consistent, and the first positions are evenly distributed within the preset area; step S102, setting a spring pedal assembly at a plurality of second positions within the preset area, wherein the spring pedal assembly comprises an insulating pedal and a spring assembly, the metal wire surface of the spring assembly is coated with an insulating layer, and the two ends of the metal wire of the spring assembly are connected to a current sensor, and the second position is different from the first position; step S103, testing each spring pedal assembly to determine whether the spring pedal assembly a first relationship function between the mass of the carried object and the induced current detected by the current sensor; step S104, obtaining the induced current detected by the current sensor corresponding to each spring pedal assembly at multiple moments in the current monitoring cycle; step S105, screening the induced current according to the first relationship function, and determining the target induced current generated when the rodent steps on the spring pedal assembly; step S106, determining the serial number of the spring pedal assembly corresponding to the target induced current, and the target moment when the target induced current is detected; step S107, determining the grassland rodent damage status score according to the serial number of the spring pedal assembly corresponding to the target induced current and the target moment; step S108, generating a grassland rodent damage monitoring report according to the grassland rodent damage status score.

[0024] According to the grassland rodent monitoring method based on magnetic field detection of the embodiment of the present invention, multiple magnets can be set in a preset area in the grassland to form a magnetic field covering the preset area, and spring pedal assemblies can be set in multiple positions to detect the activities of rodents based on the principle of electromagnetic induction when rodents step on the spring pedal assemblies. The magnetic field is less affected by the unevenness of the ground, and monitoring can still be performed when there are obstacles in the terrain, thereby improving the environmental adaptability of rodent monitoring, and the cost is low, which is convenient for large-area laying. Furthermore, the data generated when rodents step on the spring pedal assembly can be screened based on the first relationship function between the spring pedal assembly and the induced current, reducing the interference of other animals' stepping on the monitoring results and improving the monitoring accuracy.

[0025] According to one embodiment of the present invention, in step S101, rodents in the grassland may leave the underground rat holes and come to the ground to carry out activities when foraging, excreting, migrating, etc. When rodents in a preset area on the grassland move on the ground, they may move to any position in the preset area. Therefore, the activities of rodents can be detected to determine the severity of rodent damage. For example, the activity range and frequency of rodents can be detected. The larger the activity range of rodents and the higher the frequency of activities, the more serious the rodent damage.

[0026] According to one embodiment of the present invention, the activity of rodents can be detected by electromagnetic induction phenomenon in a magnetic field. For example, multiple magnets are arranged at multiple first positions in a preset area in a grassland. The specifications of the multiple magnets are consistent, and the magnetic pole directions of the multiple magnets are consistent. The first positions are evenly distributed in the preset area, that is, the first positions are evenly distributed in the preset area. In the example, the preset area is a rectangular area, the spacing distance between two adjacent magnets in the length direction of the preset area is a fixed value, the spacing distance between two adjacent magnets in the width direction is also a fixed value, and the spacing distance between two adjacent magnets in the length direction can be equal to the spacing distance between two adjacent magnets in the width direction. In addition, the magnetic pole directions of all magnets are parallel to the length direction. Through this arrangement, the magnetic pole directions of multiple magnets in the preset area are parallel to the length direction. If there is a closed circuit, and the magnetic flux passes through the cross section of the closed circuit, when the cross section of the closed circuit changes, the magnetic flux of the cross section of the closed circuit can change, and then an induced current is generated in the closed circuit, based on which the activity of rodents can be detected.

[0027] According to one embodiment of the present invention, in step S102, a spring pedal assembly may be arranged at a plurality of second positions in a preset area, and the spring pedal assembly may include the above-mentioned closed circuit. The axial direction of the spring assembly in the spring pedal assembly is in a vertical direction, and a soft spring may be used. When a rodent with a smaller body weight steps on the insulating pedal, the spring assembly may be compressed, thereby generating an induced current. When the spring is compressed, the magnetic flux in the cross section of the closed circuit connected at both ends of the spring may change, generating an induced current. Therefore, when an animal such as a rodent steps on the spring pedal assembly, the spring assembly may be compressed, generating an induced current. The second position where the spring pedal assembly is located can be evenly distributed in the preset area. For example, the interval between adjacent spring pedal assemblies is 5 meters, so that the activities of rodents in the preset area can be evenly detected. Since the spring pedal assemblies are evenly distributed, when rodents move at various positions in the preset area on the ground, there is an equal chance of stepping on the spring pedal assembly. Therefore, the relationship between the sample and the population can be presented between the rodents that step on the spring pedal assembly and all the rodents that move on the ground. Therefore, the rodent activity pattern detected by the spring pedal assembly is statistically significant and can reflect the activity pattern of the rodent population on the ground. The second position is different from the first position. The spring pedal assembly includes an insulating pedal, which is made of an insulating material and will not interfere with the induced current in the closed circuit. The metal wire surface of the spring assembly is coated with an insulating layer. When the spring assembly is compressed, multiple coils of the spring may be squeezed together. The insulating layer can prevent the induced currents generated by the multiple coils of the spring from interfering with each other. Both ends of the spring assembly are connected to a closed circuit. In the closed circuit, a current sensor is connected, which can be used to detect the induced current.

[0028] According to one embodiment of the present invention, in step S103, in addition to mice, there may be other animals stepping on the spring pedal assembly, such as rabbits, sheep and other animals. However, the weights of these animals vary greatly, and therefore, the induced current generated when mice step on the spring pedal assembly can be screened out based on the weight. Due to different weights, the degree of compression of the spring assembly when stepping on the spring pedal assembly is different. Therefore, the maximum speed that can be reached during the vertical movement process (i.e., the process of the spring being compressed in the vertical direction) is different, and the speed at which the magnetic flux of the closed circuit cross section changes is also different, resulting in different extreme values ​​of the induced current generated during the vertical movement process. Therefore, the induced current generated when mice step on the spring pedal assembly can be screened out based on the size of the extreme value of the detected induced current.

[0029] According to one embodiment of the present invention, during screening, a first relationship function between the mass of the object carried by the spring pedal assembly and the induced current detected by the current sensor can be first determined, that is, a function that describes the relationship between the mass of the animal stepping on the spring pedal assembly and the extreme value of the generated induced current, thereby determining the range of the extreme values ​​of the induced current when the mouse steps on the spring pedal assembly based on the weight range of the mouse, and determining the induced current in the detected induced current whose extreme value falls within the range as the induced current when the mouse steps on the spring pedal assembly.

[0030] According to one embodiment of the present invention, each spring pedal assembly is tested to determine a first relationship function between the mass of an object carried by the spring pedal assembly and the induced current detected by the current sensor, including: determining a motion function of the object when the object exists on the insulating pedal according to design parameters of the spring pedal assembly; determining a maximum vertical movement speed of the object when the object exists on the insulating pedal according to the motion function; and determining a first relationship function between the mass of the object carried by the spring pedal assembly and the induced current detected by the current sensor according to the maximum movement speed.

[0031] According to one embodiment of the present invention, determining the motion function of an object when there is an object on the insulating pedal according to the design parameters of the spring pedal assembly includes: determining the motion function according to formula (1),

[0032]

[0033] Wherein, t is the time variable, z(t) is the motion function between the vertical movement distance of the object and the time t, z0 is the initial vertical position of the insulating pedal when there is no object on the insulating pedal, k is the elastic coefficient of the spring assembly, m is the mass of the object, M is the mass of the insulating pedal, and g is the acceleration due to gravity.

[0034] According to one embodiment of the present invention, the elastic coefficient of the spring assembly and the mass of the insulating pedal can be determined based on the design parameters of the spring pedal assembly. When an object is carried on the insulating pedal, for example, when it is stepped on by an animal such as a rodent, the movement process of the object can be analyzed, wherein the vertical force on the object is the combined force of gravity and the spring force, and the total mass of the object and the insulating pedal is (m+M)g. At time t when the insulating pedal carries the object and moves in the vertical direction, the distance moved by the object in the vertical direction is z(t), and the spring force at this time is [z(t)-z0]k. Therefore, the acceleration of the object in the vertical direction is Furthermore, the value of acceleration is the second-order derivative z″(t) of z(t). Therefore, the motion equation of the object can be obtained as shown in the following formula (2):

[0035]

[0036] This motion equation is a differential equation, and the initial conditions of the differential equation are z(0)=z0 and z′(0)=0, where z(0) is the value of z(t) when t=0, z′(0) is the value of z′(t) when t=0, and z′(t) is the first-order derivative of z(t), which can also represent the speed of the object in the vertical direction.

[0037] According to one embodiment of the present invention, the differential equation is solved to obtain a general solution of the differential equation as shown in formula (1). Based on the general solution of the above differential equation, a function describing the speed of the object can be obtained, as shown in the following formula (3):

[0038]

[0039] Among them, v(t) is the velocity function of the object.

[0040] According to one embodiment of the present invention, determining the maximum vertical motion speed of the object when there is an object on the insulating pedal according to the motion function includes: determining the maximum vertical motion speed v of the object according to formula (4): max .

[0041]

[0042] According to one embodiment of the present invention, in formula (3), the sine function The maximum value of is 1, so the maximum value of the object's velocity function is It is the maximum vertical speed of an object.

[0043] In this way, the movement process of the object on the insulating pedal can be analyzed, and calculations can be performed based on parameters such as the object mass, the insulating pedal mass, and the elastic coefficient of the spring assembly to determine the object's motion function. The maximum speed of the object during the spring compression process can then be solved based on the motion function, thereby providing an accurate data basis for solving the induced current caused by the movement of the object compressing the spring assembly, thereby improving the accuracy of solving the induced current and the accuracy of screening the induced current when mice step on the spring pedal assembly.

[0044] According to one embodiment of the present invention, the movement speed of the object is positively correlated with the compression speed of the spring assembly. Therefore, the maximum movement speed of the object is positively correlated with the extreme value of the generated induced current. Therefore, the first relationship function between the mass of the object and the induced current detected by the current sensor can be determined based on the maximum movement speed of the object.

[0045] According to one embodiment of the present invention, determining a first relationship function between the mass of the object carried by the spring pedal assembly and the induced current detected by the current sensor according to the maximum movement speed includes: determining an undetermined coefficient equation of the first relationship function between the mass of the object carried by the i-th spring pedal assembly and the induced current detected by the current sensor according to formula (5),

[0046]

[0047] Among them, θ 1，i ,θ 2，i ,θ 3，i and θ 4，i is the undetermined coefficient of the first relational function of the i-th spring pedal assembly, I i When the mass of the object carried by the spring pedal assembly is m, the extreme value of the induced current detected by the current sensor; the mass of the object carried by the spring pedal assembly is adjusted multiple times, and the extreme value of the induced current is detected multiple times; according to the masses of multiple objects and the maximum values ​​of multiple induced currents, the undetermined coefficients are solved to obtain the solved values ​​of the undetermined coefficients; according to the solved values ​​of the undetermined coefficients and the undetermined equation of the first relationship function, the first relationship function is determined.

[0048] According to one embodiment of the present invention, it can be seen from formula (4) that the maximum movement speed of the object in the process of compressing the spring assembly is positively correlated with the square of half of the mass of the object, and since there may be an error between the elastic coefficient of the spring assembly and the mass of the insulating pedal, the undetermined coefficient θ can be used in formula (5). 1，i and θ 2，iTo replace the term represented by the elastic coefficient and the mass of the insulating pedal, and in the process of solving the unknown coefficient, the accurate solution value of the unknown coefficient is obtained, thereby describing the relationship between the mass and the maximum movement speed of the object. In addition, due to the positive correlation between the maximum movement speed of the object and the extreme value of the generated induced current, the unknown coefficient θ can be set 3，i and θ 4，i , to describe the relationship between the maximum movement speed and the extreme value of the induced current.

[0049] According to an embodiment of the present invention, after the above relationship is determined, the undetermined coefficients can be solved. For the i-th spring pedal assembly, the mass of the object carried by the spring pedal assembly can be adjusted multiple times, and the extreme value of the induced current can be detected multiple times, so as to substitute the undetermined coefficient equation of the first relationship function between the mass of the object carried by the i-th spring pedal assembly and the induced current detected by the current sensor, and solve the undetermined coefficients in the undetermined coefficient equation to obtain the solution value of the undetermined coefficient. In addition, since the mass of the insulating pedal of each spring pedal assembly and the elastic coefficient of the spring assembly may not be completely consistent, and the magnetic field strength at the position of each spring pedal assembly is different, even if the mass of the object carried on each spring pedal assembly is the same, different extreme values ​​of the induced current may be generated. Therefore, the above solution can be performed for each spring pedal assembly respectively to obtain the solution value of the undetermined coefficient of the first relationship function corresponding to each spring pedal assembly. In addition, since the above solution can be performed for each spring pedal assembly, the magnetic field strength at each position in the preset area can be different from each other, which reduces the difficulty of setting the magnetic field in the preset area.

[0050] According to one embodiment of the present invention, after obtaining the solution values ​​of the undetermined coefficients of the first relationship function corresponding to each spring pedal assembly, the undetermined coefficient equations of the first relationship function corresponding to each spring pedal assembly can be substituted respectively into the equations to obtain the first relationship functions corresponding to each spring pedal assembly.

[0051] In this way, the relationship between the mass and the maximum movement speed of the object, as well as the relationship between the maximum movement speed and the extreme value of the induced current, can be accurately expressed by the undetermined coefficient equation, so that the first relationship function corresponding to the spring pedal assembly at each second position is determined by solving the undetermined coefficient, thereby describing the relationship between the weight of the object carried on each spring pedal assembly and the extreme value of the induced current. In addition, since the above solution can be performed for each spring pedal assembly, it is not necessary to set a uniform magnetic field in a large preset area, which reduces the difficulty of setting the magnetic field in the preset area.

[0052] According to an embodiment of the present invention, in step S104, the induced current detected by the current sensor corresponding to each spring pedal assembly can be obtained at multiple moments of the current monitoring cycle, and the duration of the current monitoring cycle can be one day, 12 hours, 6 hours, 1 hour, etc., and the present invention does not limit the duration of the current detection cycle. The time interval between adjacent moments can be 1 second, 1 millisecond, etc., and the present invention does not limit the time interval between adjacent moments.

[0053] According to one embodiment of the present invention, in step S105, the induced current detected by the current sensor corresponding to each spring pedal assembly can be screened according to the weight of the rodent and the above-mentioned first relationship function to determine the target induced current generated when the rodent steps on the spring pedal assembly.

[0054] According to one embodiment of the present invention, the induced current is screened according to the first relationship function to determine the target induced current generated when a rodent steps on a spring pedal assembly, including: obtaining a preset upper limit and lower limit of the rodent mass; substituting the upper limit and lower limit of the mass into the first relationship function to obtain an upper limit of the induced current extreme value and a lower limit of the induced current extreme value; if it is detected that the extreme value of the induced current is less than or equal to the upper limit of the extreme value of the induced current, and greater than or equal to the lower limit of the extreme value of the induced current, then the extreme value of the induced current is the target induced current.

[0055] According to one embodiment of the present invention, since the mass of an object is positively correlated with the extreme value of the induced current generated, the upper limit of the mass of the rodent can be substituted into the first relationship function corresponding to each spring pedal assembly to obtain the upper limit of the extreme value of the induced current generated when each spring pedal assembly is stepped on by the rodent. Similarly, the lower limit of the mass of the rodent can be substituted into the first relationship function corresponding to each spring pedal assembly to obtain the lower limit of the extreme value of the induced current generated when each spring pedal assembly is stepped on by the rodent. Therefore, among the extreme values ​​of the induced current generated when each spring pedal assembly is stepped on, the induced current corresponding to the extreme value of the induced current within the range from the lower limit of the extreme value of the induced current to the upper limit of the extreme value of the induced current is the target induced current, that is, the induced current generated by the stepping of the rodent. Other types of animals commonly seen on grasslands, such as rabbits, sheep, insects, etc., are significantly different in weight from rodents. Therefore, the target induced current generated when the rodent steps on can be screened by the relationship between weight and the extreme value of the induced current.

[0056] According to one embodiment of the present invention, in step S106, the serial number of the spring pedal assembly that detects the target induced current and the target time when each spring pedal assembly detects the target induced current, that is, the time when the extreme value of the target induced current is detected, can be determined.

[0057] According to one embodiment of the present invention, in step S107, the activity range and frequency of rodents can be analyzed based on the serial number of the spring pedal assembly that detects the target induced current and the target time, so as to determine the grassland rodent infestation score to accurately describe the severity of the rodent infestation.

[0058] According to one embodiment of the present invention, a grassland rodent infestation score is determined based on the serial number of the spring pedal assembly corresponding to the target induced current and the target moment, including: arranging the target moments corresponding to all spring assemblies to obtain a target moment sequence; determining the distance between the spring pedal assemblies corresponding to the target induced current based on the serial number of the spring pedal assembly; and determining the grassland rodent infestation score based on the target moment sequence and the distance between the spring pedal assemblies corresponding to the target induced current.

[0059] According to one embodiment of the present invention, all target moments can be arranged in chronological order to obtain a target moment sequence. The serial numbers of the spring pedal assemblies correspond one to one with the second positions where they are located, so the distances between the spring pedal assemblies can be determined based on the serial numbers of the spring pedal assemblies.

[0060] According to one embodiment of the present invention, determining a grassland rodent damage status score according to the target time sequence and the distance between the spring pedal assembly corresponding to the target induced current includes: setting a first preset time length; determining a first number of target moments in a time window with each target moment in the target time sequence as a starting time and the first preset time length as a duration; determining the grassland rodent damage status score S according to formula (6). R ,

[0061]

[0062] Among them, N 1，max is the maximum value of the first number of target moments in the time window, n2 is the number of second positions, ΔD is the distance between adjacent spring pedal assemblies, n1 is the minimum value of the sequence number of the time window including the last target moment in the target moment sequence, N 1，j is the first number of target moments in the time window of the jth target moment, L j，(j+s)-(j+u) is the distance between the spring pedal assembly corresponding to the j+sth target moment and the spring pedal assembly corresponding to the j+uth target moment in the time window of the jth target moment, 0≤s≤N 1，j -1, 0≤u≤N 1，j -1, and n1, n2, N 1，max 、N 1，j , j, s and u are all positive integers.

[0063] According to one embodiment of the present invention, the first preset time length can be set according to the average speed of mouse movement and the distance between the spring pedal assemblies. For example, the first preset time length is the ratio of the distance between the spring pedal assemblies to the average speed of mouse movement. The time window is set based on the first preset time length. Then, within the same time window, the target induced current generated by the trampling of mice detected by different spring pedal assemblies is generated by different mice stepping on the spring pedal assemblies respectively, rather than being generated by the same mouse stepping on the two spring pedal assemblies at different times. This is because according to the average speed of mice, the same mouse cannot reach the position of another spring pedal assembly from the position of one spring pedal assembly within the time window.

[0064] According to one embodiment of the present invention, a first number of target moments within a time window starting at each target moment and lasting for a first preset time can be determined, and the first number can be used as the number of rodents stepping on the spring pedal assembly within the time window. Therefore, in formula (6), It represents the maximum value of the ratio between the number of rodents stepping on the spring pedal assembly and the spring pedal assembly in the same time window, that is, the proportion of the spring pedal assembly stepped on by rodents. The higher the ratio, the more active rodents are in the same time window, the more frequent the rodent activities are, the more active they are, and the more serious the rodent damage is.

[0065] According to one embodiment of the present invention, in formula (6), represents the sum of the distances between the spring pedal assemblies corresponding to each target moment in a time window, (N 1，j ) 2 -N 1，j is the number of distances between the spring pedal assemblies involved in the calculation. Specifically, the distances involved in the calculation may include the spring pedal assembly corresponding to the j+0th target time and the N spring pedal assemblies in the time window. 1，j The distance between the spring pedal assembly corresponding to the j+1th target moment and the spring pedal assembly corresponding to the j+1th target moment and the N 1，j The distance between the spring pedal assemblies corresponding to the target moment...j+N 1，j -1 Spring pedal assembly corresponding to the target time and N in the time window 1，j The distance between the spring pedal assemblies corresponding to the target time, a total of (N 1，j ) 2 However, the above calculation includes the distance between the spring pedal assembly corresponding to the j+0th target moment and the spring pedal assembly corresponding to the j+0th target moment, and includes the distance between the spring pedal assembly corresponding to the j+1th target moment and the spring pedal assembly corresponding to the j+1th target moment... 1，j-1 The spring pedal assembly corresponding to the target time and the j+Nth 1，j -1 The distance between the spring pedal assemblies corresponding to the target time, that is, the distance between each spring pedal assembly and itself, and this distance is 0, that is, there are N 1，j The distances with a value of 0 can be deducted from the number of distances, so the number of distances between spring pedal assemblies involved in the calculation is (N 1，j ) 2 -N 1，j .therefore, It is the average distance of mice stepping on the spring pedal assembly in the same time window. is the average value of the average distances of rodents stepping on the spring pedal assembly within multiple time windows, and the number of time windows is the minimum value of the serial number of the time windows including the last target moment in the target moment sequence, that is, when the time window includes the last target moment in the target moment sequence, the time window no longer moves backward, and the number of time windows involved in the calculation at this time is n1. Therefore, the average value of the average distances of rodents stepping on the spring pedal assembly within multiple time windows can also represent the average distance of rodents stepping on the spring pedal assembly during the time period from the first detection of a rodent stepping on the spring pedal assembly to the last detection of a rodent stepping on the spring pedal assembly, and the ratio of the average distance to the distance between adjacent spring pedal assemblies. It can be used to describe the activity range of rodents. The larger the ratio is, the greater the average distance between rodents is, the wider the activity range is, and the more serious the rodent damage is.

[0066] According to one embodiment of the present invention, the above item representing the frequency of rodent activities can be multiplied by the item representing the range of rodent activities to obtain a grassland rodent infestation score. The higher the grassland rodent infestation score, the more active the rodent activities are, the wider the activity range is, and the more severe the rodent infestation is.

[0067] In this way, by setting a time window, the situation where the same rodent steps on different spring pedal assemblies within the time window can be excluded, thereby improving the accuracy of the grassland rodent infestation status score. In addition, the frequency and activity of rodent activities can be determined based on the maximum number of spring pedal assemblies stepped on by rodents within the time window, and the range of rodent activities can be determined based on the average distance of spring pedal assemblies stepped on by rodents within the time window. The grassland rodent infestation status score can be determined based on the frequency and range of rodent activities to accurately describe the severity of grassland rodent infestation and improve the accuracy, comprehensiveness and objectivity of the grassland rodent infestation status score.

[0068] According to one embodiment of the present invention, in step S108, a grassland rodent pest monitoring report can be generated based on the grassland rodent pest status score. For example, when the grassland rodent pest status score is higher than a preset score threshold, a prompt report with content such as that the grassland rodent pest is relatively serious can be generated, thereby prompting staff to carry out rodent pest prevention and control work.

[0069] According to the grassland rodent monitoring method based on magnetic field detection of the embodiment of the present invention, multiple magnets can be set in a preset area in the grassland to form a magnetic field covering the preset area, and spring pedal components can be set at multiple positions to detect the activity of rodents based on the principle of electromagnetic induction when rodents step on the spring pedal components, and the magnetic field is less affected by the unevenness of the ground, and monitoring can still be performed when there are obstacles in the terrain, thereby improving the environmental adaptability of rodent monitoring, and the cost is low, which is convenient for large-area laying. Further, the data generated when rodents step on can also be screened based on the first relationship function between the spring pedal component and the induced current, reducing the interference of other animals' stepping on the monitoring results, and improving the monitoring accuracy. When determining the movement process of an object on the insulating pedal, the movement process of the object on the insulating pedal can be analyzed, and the motion function of the object can be determined based on the mass of the object, the mass of the insulating pedal, the elastic coefficient of the spring component and other parameters, and then the maximum speed of the object in the spring compression process can be solved based on the motion function, thereby providing an accurate data basis for solving the induced current caused by the movement of the spring component compressed by the object movement, improving the accuracy of solving the induced current and the accuracy of screening the induced current when the rodents step on the spring pedal component. When determining the first relationship function, the relationship between the mass and the maximum movement speed of the object, as well as the relationship between the maximum movement speed and the extreme value of the induced current, can be accurately expressed by the undetermined coefficient equation, so that the first relationship function corresponding to the spring pedal assembly at each second position is determined by solving the undetermined coefficient, thereby describing the relationship between the weight of the object carried on each spring pedal assembly and the extreme value of the induced current. In addition, since the above solution can be performed for each spring pedal assembly, it is not necessary to set a uniform magnetic field in a preset area with a large range, which reduces the difficulty of setting the magnetic field in the preset area. When determining the grassland rodent infestation status score, a time window can be set to exclude the situation where the same rodent steps on different spring pedal assemblies within the time window, thereby improving the accuracy of the grassland rodent infestation status score. In addition, the frequency and activity of rodent activities can be determined based on the maximum number of spring pedal assemblies stepped on by rodents within the time window, and the range of rodent activities can be determined based on the average distance of spring pedal assemblies stepped on by rodents within the time window. The grassland rodent infestation status score can be determined based on both the frequency and range of rodent activities to accurately describe the severity of grassland rodent infestation and improve the accuracy, comprehensiveness and objectivity of the grassland rodent infestation status score.

[0070] Figure 2 A schematic diagram of a grassland rodent monitoring system based on magnetic field detection according to an embodiment of the present invention is exemplarily shown, the system comprising: a first setting module, used to set a plurality of magnets at a plurality of first positions within a preset area in the grassland, wherein the specifications of the plurality of magnets are consistent, and the magnetic pole directions of the plurality of magnets are consistent, and the first positions are evenly distributed within the preset area; a second setting module, used to set a spring pedal assembly at a plurality of second positions within the preset area, wherein the spring pedal assembly comprises an insulating pedal and a spring assembly, the metal wire surface of the spring assembly is coated with an insulating layer, and the two ends of the metal wire of the spring assembly are connected to a current sensor, and the second position is different from the first position; a first relationship function module, used to test each spring pedal assembly to determine the spring pedal assembly a first relationship function between the mass of the object carried by the component and the induced current detected by the current sensor; a detection module, used to obtain the induced current detected by the current sensor corresponding to each spring pedal assembly at multiple moments in the current monitoring cycle; a screening module, used to screen the induced current according to the first relationship function, and determine the target induced current generated when the rodent steps on the spring pedal assembly; a determination module, used to determine the serial number of the spring pedal assembly corresponding to the target induced current, and the target moment when the target induced current is detected; a grassland rodent pest status scoring module, used to determine the grassland rodent pest status score according to the serial number of the spring pedal assembly corresponding to the target induced current and the target moment; a reporting module, used to generate a grassland rodent pest monitoring report according to the grassland rodent pest status score.

[0071] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A grassland rodent pest monitoring method based on magnetic field detection, characterized in that: include: A plurality of magnets are arranged at a plurality of first positions in a preset area in the grassland, wherein the specifications of the plurality of magnets are consistent, and the magnetic pole directions of the plurality of magnets are consistent, and the first positions are evenly distributed in the preset area; a spring pedal assembly is arranged at a plurality of second positions in the preset area, wherein the spring pedal assembly comprises an insulating pedal and a spring assembly, the metal wire surface of the spring assembly is coated with an insulating layer, and the two ends of the metal wire of the spring assembly are connected to a current sensor, and the second position is different from the first position; each spring pedal assembly is tested to determine a first relationship function between the mass of the object carried by the spring pedal assembly and the induced current detected by the current sensor; at a plurality of moments in the current monitoring cycle, the induced current detected by the current sensor corresponding to each spring pedal assembly is obtained; according to the first relationship function, the induced current is screened to determine a target induced current generated when a rodent steps on the spring pedal assembly; the serial number of the spring pedal assembly corresponding to the target induced current and the target time when the target induced current is detected are determined; according to the serial number of the spring pedal assembly corresponding to the target induced current and the target time, a grassland rodent damage status score is determined; according to the grassland rodent damage status score, a grassland rodent damage monitoring report is generated.

2. The grassland rodent damage monitoring method based on magnetic field detection according to claim 1 is characterized in that: Each spring pedal assembly is tested to determine a first relationship function between the mass of an object carried by the spring pedal assembly and the induced current detected by the current sensor, including: determining a motion function of the object when the object exists on the insulating pedal according to design parameters of the spring pedal assembly; determining a maximum vertical movement speed of the object when the object exists on the insulating pedal according to the motion function; and determining a first relationship function between the mass of the object carried by the spring pedal assembly and the induced current detected by the current sensor according to the maximum movement speed.

3. The grassland rodent damage monitoring method based on magnetic field detection according to claim 2 is characterized in that: According to the design parameters of the spring pedal assembly, the motion function of the object when there is an object on the insulating pedal is determined, including: according to the formula Determine the motion function, where t is a time variable, z(t) is a motion function between the vertical movement distance of the object and time t, z0 is an initial vertical position of the insulating pedal when no object is carried on the insulating pedal, k is an elastic coefficient of the spring assembly, m is the mass of the object, M is the mass of the insulating pedal, and g is the acceleration due to gravity.

4. The grassland rodent damage monitoring method based on magnetic field detection according to claim 3 is characterized in that: According to the motion function, determining the maximum vertical motion speed of the object when there is an object on the insulating pedal includes: according to the formula Determine the maximum vertical velocity v of the object max .

5. The grassland rodent damage monitoring method based on magnetic field detection according to claim 4 is characterized in that: According to the maximum movement speed, determining a first relationship function between the mass of the object carried by the spring pedal assembly and the induced current detected by the current sensor includes: according to the formula Determine the undetermined coefficient equation of the first relationship function between the mass of the object carried by the i-th spring pedal assembly and the induced current detected by the current sensor, where θ 1，i ,θ 2，i ,θ 3，i and θ 4，i is the undetermined coefficient of the first relational function of the i-th spring pedal assembly, I i When the mass of the object carried by the spring pedal assembly is m, the extreme value of the induced current detected by the current sensor; the mass of the object carried by the spring pedal assembly is adjusted multiple times, and the extreme value of the induced current is detected multiple times; according to the masses of multiple objects and the maximum values ​​of multiple induced currents, the undetermined coefficients are solved to obtain the solved values ​​of the undetermined coefficients; according to the solved values ​​of the undetermined coefficients and the undetermined coefficient equation of the first relationship function, the first relationship function is determined.

6. The grassland rodent damage monitoring method based on magnetic field detection according to claim 1, characterized in that: According to the first relationship function, the induced current is screened to determine the target induced current generated when the rodent steps on the spring pedal assembly, including: obtaining a preset upper limit and a lower limit of the rodent mass; substituting the upper limit and the lower limit of the mass into the first relationship function to obtain an upper limit of the induced current extreme value and a lower limit of the induced current extreme value; if it is detected that the extreme value of the induced current is less than or equal to the upper limit of the extreme value of the induced current, and greater than or equal to the lower limit of the extreme value of the induced current, then the induced current is the target induced current.

7. The grassland rodent damage monitoring method based on magnetic field detection according to claim 1 is characterized in that: According to the serial number of the spring pedal assembly corresponding to the target induced current and the target time, the grassland rodent infestation status score is determined, including: arranging the target times corresponding to all the spring assemblies to obtain a target time sequence; according to the serial number of the spring pedal assembly, determining the distance between the spring pedal assemblies corresponding to the target induced current; according to the target time sequence and the distance between the spring pedal assemblies corresponding to the target induced current, determining the grassland rodent infestation status score.

8. The method for monitoring grassland rodent damage based on magnetic field detection according to claim 7, characterized in that: Determining the grassland rodent damage status score according to the target moment sequence and the distance between the spring pedal assembly corresponding to the target induced current includes: setting a first preset time length; determining a first number of target moments in a time window with each target moment in the target moment sequence as a starting moment and the first preset time length as a duration ... Determine the grassland rodent damage score S R , where N 1，max is the maximum value of the first number of target moments in the time window, n2 is the number of second positions, ΔD is the distance between adjacent spring pedal assemblies, n1 is the minimum value of the sequence number of the time window including the last target moment in the target moment sequence, N 1，j is the first number of target moments in the time window of the jth target moment, L j，(j+s)-(j+u) is the distance between the spring pedal assembly corresponding to the j+sth target moment and the spring pedal assembly corresponding to the j+uth target moment in the time window of the jth target moment, 0≤s≤N 1，j -1, 0≤u≤N 1，j -1, and n1, n2, N 1，max 、N 1，j , j, s and u are all positive integers.

9. A grassland rodent monitoring system based on magnetic field detection, characterized in that: include: A first setting module is used to set a plurality of magnets at a plurality of first positions within a preset area in the grassland, wherein the specifications of the plurality of magnets are consistent, and the magnetic pole directions of the plurality of magnets are consistent, and the first positions are evenly distributed within the preset area; a second setting module is used to set a spring pedal assembly at a plurality of second positions within the preset area, wherein the spring pedal assembly includes an insulating pedal and a spring assembly, the metal wire surface of the spring assembly is coated with an insulating layer, and the two ends of the metal wire of the spring assembly are connected to a current sensor, and the second position is different from the first position; a first relationship function module is used to test each spring pedal assembly to determine whether the mass of the object carried by the spring pedal assembly is related to the sensor detected by the current sensor. a first relationship function between the spring pedal assemblies and the induced currents; a detection module, for obtaining the induced currents detected by the current sensors corresponding to the spring pedal assemblies at multiple moments in the current monitoring cycle; a screening module, for screening the induced currents according to the first relationship function, and determining the target induced currents generated when the rodents step on the spring pedal assemblies; a determination module, for determining the serial number of the spring pedal assembly corresponding to the target induced current, and the target moment when the target induced current is detected; a grassland rodent pest status scoring module, for determining the grassland rodent pest status score according to the serial number of the spring pedal assembly corresponding to the target induced current and the target moment; and a reporting module, for generating a grassland rodent pest monitoring report according to the grassland rodent pest status score.

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