Profile sector scanning method, control device and migration flux statistics method of insect radar

Abstract

The present invention discloses a profile fan scanning method, a control device and a migration flux statistical method for an insect radar, belonging to the technical field of insect radar. It is a working mode of profile fan scanning for migration based on the prior information of the insect head orientation. This scanning method significantly improves the beam coverage range and shortens the sampling period. The error of the migration flux statistics carried out under this scanning method is relatively small. First, the insect radar performs pre-measurement for a set time to obtain the prior information of the aerial migration state of the insect target, and determines the orientation θ0 where the insect migration directions are concentrated and the maximum angular velocity ω of the target relative to the insect radar based on the prior information. scan ; It is set that the insect radar performs profile fan scanning on the profile in the insect migration direction, and at the same time, the fixed azimuth angle of the insect radar is set to θ0 and the scanning angular velocity is set to ω. scan ; And calculate the beam coverage time ΔT of different altitude layers of the insect radar in the profile fan scanning mode. h .

Description

Technical Field

[0001] The invention relates to the technical field of insect radars, and in particular to a profile fan scanning method and a control device of an insect radar in a migration direction. Background Art

[0002] Insect migration is a common phenomenon in nature. Migratory entomology is a discipline that studies insect sources and migration pathways, migration behaviors and their regulation, as well as research methods and means. Radar, as a tool for long-distance detection, can achieve all-day and all-weather monitoring of target airspace, providing the most effective means for observing the migration of aerial insect swarms. Its application and development have promoted the development of migratory entomology from qualitative research to quantitative analysis. As the most effective insect migration monitoring method at present, insect radar can effectively monitor the biological parameters and kinematic parameters of migratory insects in the high altitude, and plays an irreplaceable role in the field of insect migration.

[0003] The beam coverage of insect radar directly affects whether it can accurately monitor insect migration. For beam coverage, existing insect radars have two working modes: vertical measurement and scanning. The vertical measurement mode is to point the beam vertically to the sky, monitor the insects flying over the beam to evaluate the migration scale of this airspace area. The disadvantage of the vertical measurement mode is that the spatial sampling range is small, especially in narrow migration channels. If the installation site is not directly below the migration, the estimation of the flux of migrating insects cannot accurately evaluate the migration status of insects. The other is the scanning mode. In this mode, the radar periodically scans the azimuth at a series of fixed elevation angles, and estimates the migration flux of this area based on the echo power intensity of each detection unit. The disadvantage of the scanning mode is that the spatial sampling rate is low and the airspace coverage is incomplete. Only a small part of the elevation space can be sampled and counted. When the insect migration takes off and lands (the insect is not in a horizontal flight state), it is more likely to have repeated statistics or incomplete statistics. When there is a large density of biological migration, the flux statistics error is large. Moreover, due to the narrow radar beam width, this method takes a long time to complete a complete wave position coverage cycle.

[0004] Therefore, there is currently a lack of a scanning method for insect radar with high spatial sampling rate and complete airspace coverage, which leads to the problem of large statistical errors in insect migration flux, and there has been no better solution. Summary of the invention

[0005] In view of this, the present invention provides a profile sector scanning method, a control device and a migration flux statistics method for an insect radar, which is a migration profile sector scanning working mode based on prior information of the insect head direction. This scanning method significantly improves the beam coverage range and shortens the sampling period. The migration flux statistics performed under this scanning method have a small error.

[0006] To achieve the above object, the present invention provides a profile sector scanning method of an insect radar in the migration direction, comprising the following steps:

[0007] The insect radar performs a pre-measurement at a set time to obtain the prior information of the aerial migration state of the insect target, and determines the direction θ0 of the insect migration direction based on the prior information, and determines the maximum angular velocity ω of the target relative to the insect radar. scan ;

[0008] Set the insect radar to perform profile fan scanning on the profile of the insect migration direction, and set the fixed azimuth angle of the insect radar to θ0 and the scanning angular velocity to ω scan ; and calculate the beam coverage time ΔT of different altitude layers of insect radar in profile sector scanning mode h .

[0009] Furthermore, the insect radar performs a pre-measurement at a set time to obtain prior information on the aerial migration status of the insect target, specifically:

[0010] Perform vertical measurement within the set time, or set the insect radar to perform vertical measurement and profile scanning in a cycle alternating within the set time to obtain prior information on the aerial migration status.

[0011] Furthermore, the prior information of the insect target’s migratory state in the air includes: the insect target’s flight speed, altitude, and target polarization scattering matrix PSM;

[0012] The flight speed is the tangential flight speed of the insect target.

[0013] Further, based on the prior information, the direction θ0 of the concentrated insect migration direction of the insect migration is determined, which specifically includes the following steps:

[0014] The body axis orientation of the insect target is determined by PSM. After obtaining the body axis orientation of all insects in a statistical period, a data set with different orientations is obtained. A statistical distribution of all orientation angles in the data set is performed, and the peak value of the statistical result is obtained as the orientation θ0 where the insect migration direction is concentrated at this time.

[0015] Furthermore, the maximum angular velocity ω of the target relative to the insect radar is determined scan for:

[0016]

[0017] Where V i is the tangential velocity of the insect target, h i The height of the insect target.

[0018] If ω scan If the maximum speed allowed by the insect radar servo hardware is exceeded, the ω scanSet to the maximum servo speed.

[0019] Furthermore, it is assumed that the beam coverage time ΔT(h) of different altitude layers of the insect radar in the profile sector scanning mode is different. Specifically, the functional relationship between the beam coverage height h and its residence time ΔT(h) is:

[0020]

[0021] Where 0≤h≤R max , R min and R max They are respectively the closest detection distance and the farthest detection distance of the insect radar.

[0022] Another embodiment of the present invention further provides a fan-scan control device for an insect radar in the migration direction, including an insect radar control module, a priori information acquisition module, and a profile fan-scan parameter determination module.

[0023] The insect radar control module is used to control the insect radar to perform pre-measurement of a set time at the initial moment to obtain prior information of the aerial migration state of the insect target and send it to the prior information acquisition module.

[0024] A priori information acquisition module is used to determine the direction θ0 of the insect migration direction of the insect migration based on the priori information and determine the maximum angular velocity ω of the target relative to the insect radar scan , and sent to the profile sector scanning parameter determination module.

[0025] The profile fan scanning parameter determination module sets the insect radar to perform profile fan scanning on the profile of the insect migration direction, sets the profile fan scanning parameters, and sends the profile fan scanning parameters to the insect radar control module; setting the profile fan scanning parameters includes: setting the insect radar fixed azimuth angle to θ0, scanning angular velocity to ω scan , and set the beam coverage time ΔT of different altitude layers of insect radar in profile sector scanning mode h different.

[0026] After receiving the profile sector scanning parameters, the insect radar control module controls the insect radar to perform profile sector scanning under the profile sector scanning parameters.

[0027] Furthermore, the maximum angular velocity ω of the target relative to the insect radar is determined scan for:

[0028]

[0029] Where V i is the tangential velocity of the insect target, h i The height of the insect target.

[0030] If ω scanIf the maximum speed allowed by the insect radar servo hardware is exceeded, the ω scan Set to the maximum servo speed.

[0031] Furthermore, it is assumed that the beam coverage time ΔT(h) of different altitude layers of the insect radar in the profile sector scanning mode is different. Specifically, the functional relationship between the beam coverage height h and its residence time ΔT(h) is:

[0032]

[0033] Where 0≤h≤R max , R min and R max They are respectively the closest detection distance and the farthest detection distance of the insect radar.

[0034] 10. A migration flux statistical method, characterized in that it comprises the following steps:

[0035] S1: setting the profile sector scanning mode of the insect radar by the method as claimed in claims 1 to 5;

[0036] S2: Statistics of insect migration flux based on profile fan scanning mode, specifically:

[0037] Set at time T n Time interval ΔT n , height h k Height interval Δh k , that is, the minimum statistical unit (k,n) defined. Within the statistical unit, the flux statistics are flux(k,n):

[0038]

[0039] In the smallest statistical unit (k,n), num k,n Migratory insects, D i (k,n) is the longest beam-crossing distance of the detected target, E[D i (k,n)] is D i (k,n), α is the elevation angle of the insect radar beam, and h is the beam coverage height.

[0040] Beneficial effects:

[0041] 1. The present invention provides a profile sector scanning method for an insect radar. The method is a migration profile scanning working mode based on the prior information of the insect head direction. It is necessary to first obtain the prior information of insect migration, including the peak value of the head direction distribution and the maximum angular velocity of the target relative to the radar. Then, the profile sector scanning parameters are set using the prior information. The set profile sector scanning mode can significantly improve the beam coverage range and shorten the sampling period.

[0042] 2. The profile sector scanning method of an insect radar provided by the present invention requires a period of vertical measurement before performing a migration profile pitch scanning working mode to obtain prior information on the aerial migration status. The insect radar can also be set to perform vertical measurement and profile scanning in a cyclic alternating manner, thereby obtaining prior information including the direction in which the insect migration direction is concentrated and the maximum angular velocity of the target relative to the insect radar. This method can accurately obtain true aerial migration prior information.

[0043] 3. The profile sector scanning method of an insect radar provided by the present invention sets profile sector scanning parameters based on prior information, adjusts the radar azimuth to the direction of the insect migration profile, and performs continuous and periodic large-profile scanning on the profile to obtain the migration information with the largest range.

[0044] 4. The present invention provides a profile sector scanning method for an insect radar, in which the body axis orientation of the insect target is determined by PSM, and the measurement accuracy of the target polarization scattering matrix PSM determines the measurement accuracy of the insect body axis orientation. After calculating the body axis orientations of all insects within a statistical period, a data set with different orientations is often obtained. Here, a statistical distribution is made for all orientation angles, and the peak value of the statistical result is obtained as the orientation in which the insect migration direction is concentrated at this time. This method determines the accuracy of the insect orientation and can ensure that after the subsequent profile sector scanning parameters are set, the profile scanning range can accurately cover the actual range of aerial migration.

[0045] 5. The present invention provides a profile fan-scan control device for an insect radar, which can use a control module to control the insect radar, use a priori information acquisition module to obtain the insect head direction priori information profile fan-scan parameter determination module, set the insect radar to perform profile fan-scan on the profile of the insect migration direction, and set the profile fan-scan parameters. The device can not only implement the profile fan-scan method, improve the beam coverage, and shorten the sampling period, but also the functional modules of the device are reasonably set, and the modular design enables the radar interconnection part and the information solution part to be implemented in different functional modules, which is more conducive to the real-time profile fan-scan method and improves the control efficiency.

[0046] 6. The migration flux statistics method provided by the present invention is based on the above-mentioned profile fan scanning working mode. Since the beam coverage range is improved and the sampling period is shortened, the scanning mode achieves the purpose of complete airspace coverage and high spatial sampling rate. When the insect migration takes off and lands (the insects are not in level flight), it is not easy to have repeated statistics or incomplete statistics, and the flux statistical error is small. It is suitable for the migration flux statistics when large-density biological migration occurs. The flux statistics have high accuracy and are of great significance for the assessment of the scale of insect migration and early warning of agricultural pests. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the insect radar scanning operation of the present invention.

[0048] Figure 2 The present invention is a flow chart of the method.

[0049] Figure 3 The difference in beam coverage height at different elevation angles of the present invention: a) radar beam coverage height at low elevation angle α_1; b) beam coverage height at high elevation angle α_2.

[0050] Figure 4 This is a schematic diagram of the time integration range covered by the height h of the present invention.

[0051] Figure 5 This is a schematic diagram of the scanning statistics height and coverage time of the present invention. DETAILED DESCRIPTION

[0052] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0053] In order to enable the insect radar to detect a larger airspace, the present invention proposes a migration channel profile scanning method, which needs to first obtain prior information on insect migration, including the peak value of the head direction distribution and the maximum angular velocity of the target relative to the radar.

[0054] For creatures flying at high altitudes, since they need to maximize their flight efficiency, it can be expected that they will fly straight and stably. When the servo scans the profile in the migration direction in a reciprocating manner, it is more likely to detect more individual insects. Therefore, the scanning method proposed in the present invention is to fix the azimuth angle and scan the pitch angle in a reciprocating manner in the profile in the migration direction of the insects. The scanning schematic diagram is shown in FIG. Figure 1 shown.

[0055] The invention provides a migration profile scanning working mode based on a priori information of insect head orientation, and a method for setting scanning parameters, specifically:

[0056] The insect radar performs a pre-measurement at a set time to obtain the prior information of the aerial migration state of the insect target, and determines the direction θ0 of the insect migration direction based on the prior information, and determines the maximum angular velocity ω of the target relative to the insect radar. scan ;

[0057] Set the insect radar to perform profile fan scanning on the profile of the insect migration direction, and set the fixed azimuth angle of the insect radar to θ0 and the scanning angular velocity to ω scan ; and set the beam coverage time ΔT of different altitude layers of insect radar in profile sector scanning mode h different.

[0058] Specifically, the following steps can be used to achieve this:

[0059] Step 1: Determine the fixed azimuth angle of the insect radar. Specifically:

[0060] In order to make the radar beam cover more migrating pests, it is common sense that when the radar beam scanning direction is perpendicular to the migration direction, the most migrating insects can be covered. Based on this common sense, it is first necessary to detect the head orientation distribution information of the insect radar, and then adjust the servo azimuth angle to be perpendicular to the peak angle of the insect migration head orientation distribution. For example, most insects are migrating with their heads facing 23° north-east, so the insect radar azimuth angle is set to 113° north-east to maximize the coverage of the radar's effective statistical profile. Therefore, when performing the migration profile pitch scanning working mode, it is necessary to first perform vertical measurements for a period of time to obtain prior information on the migration status in the air. The insect radar can also be set to perform vertical measurements and profile scanning in a cyclic alternating manner.

[0061] The calculation method of the insect's body axis direction is as follows. First, assume that the insect's body shape is symmetrical about the midline of the body axis. According to the principle that the echo intensity is the largest when the polarization direction is parallel to the body axis, it is known that when the insect's body axis is parallel to the horizontal polarization (H polarization) direction, its polarization scattering matrix (PSM) can be expressed as:

[0062]

[0063] Where |S h |>|S v |, then the target rotates by angle θ (the insect body axis deviates from the polarization direction of H by angle θ, see Figure 2 ), the polarization scattering matrix can be expressed as:

[0064]

[0065] Because θ represents the direction of the insect body axis, when defining θ∈(-π / 4,π / 4), θ can be expressed by the insect's PSM as:

[0066]

[0067] Formula (3) expresses the direction of the insect body axis through the polarization scattering matrix. It can be seen from the formula that the measurement accuracy of the target polarization scattering matrix PSM determines the measurement accuracy of the insect body axis direction. After calculating the body axis orientation of all insects in a statistical period, a data set with different orientations is often obtained. Here, a statistical distribution of all orientation angles is performed, and the peak value of the statistical result is obtained as the orientation of the concentrated insect migration direction at this time.

[0068] Step 2: Calculate the target's maximum angular velocity ω relative to the insect radar scan Specifically:

[0069] The scanning speed is determined according to the tangential flight speed of the insect migration. Assume that the tangential speed sequence of the target is measured in the vertical measurement mode stage. and the altitude sequence The scanning angular velocity ω of the radar scan can be set to the highest angular velocity of the target relative to the radar. The purpose is to minimize the scanning cycle time on the premise of reducing the radar from repeatedly detecting the same target. The calculation method is as follows:

[0070]

[0071] Note that in Equation (4), if ω scan exceeds the highest rotational speed allowed by the servo hardware, then ω scan is set to the highest rotational speed of the servo. So far, the key scanning parameters of the profile pitch reciprocating scan based on the insect migration direction have been determined.

[0072] Step 3: Calculate the beam coverage time ΔT of the insect radar at different altitude layers in this scanning mode h . Specifically:

[0073] The following introduces the calculation method of the beam coverage time ΔT h of different altitude layers within one scanning cycle in the scanning working mode. One scanning cycle is when the pitch angle α ranges from 0° to 180°. The insect radar is of pulse system, and the nearest detection distance R min >0. It is known that the detection distance range of the radar is [R min , R max . When the radar is in the scanning working mode, within one complete scanning cycle (0~π), for different altitude layers, the dwell time of the beam is different, and as the elevation angle α increases, the detection altitude range gradually increases. For example, at Figure 3 , when the radar beam points at the low elevation angle α1 and the high elevation angle α2 respectively, the detection altitude ranges of the radar are [H min1 , H max1 and [H min2 , H max2 . According to trigonometric functions, the altitude ranges can be easily obtained as sin(α1)·[R min , R max and sin(α2)·[R min , R max . It is easy to find that since sin(α1)<sin(α2), the altitude range that the radar can cover is larger at the high elevation angle α2.

[0074] Assume that the radar scans at a constant speed, ignoring the acceleration and deceleration of the radar turntable during the start and stop phases. The instantaneous beam coverage duration t h The calculation method is as shown in Equation (7), where ω scanis the pitch scanning angular velocity of the turntable.

[0075]

[0076] In a scanning cycle, when the radar beam is uniformly scanned from 0° to 180°, for a certain height h, the beam coverage time is the sum of the residence time of all elevation angle beams in the scanning cycle at that height. Figure 4 As shown, the red area is the area that the radar beam center axis and detection range can cover. Figure 4 -(a) When h∈[0,R min ], taking height h1 as an example, the radar can count the angle range of height h1 is 2×[α min1 ,α max1 ]. Figure 4 -(b) When h∈[R min ,R max ], taking height h2 as an example, the radar beam can cover the elevation angle range of height h2 is 2×[α min2 ,α max2 ].

[0077] Depend on Figure 4 It can be seen that α min1 With α min2 From the height h and R max Decide, Due to the radar's blind range, the radar beam pitch angle is higher than α max1 , the beam will not be able to cover the height h1, so As for [R min ,R max ] altitude range, it will not be affected by the radar blind range. According to the beam dwell time ΔT(h) at height h in a scanning cycle, the coverage angle is integrated by equation (8), so the height h is expressed as R min The boundary interval is divided into two sections and the beam coverage duration is calculated separately, and we can get:

[0078]

[0079] Therefore, by combining equations (7) and (8), we can obtain the functional relationship between the height h and its residence time ΔT(h) as follows, where 0≤h≤R max :

[0080]

[0081] According to this method, we can get Figure 5The diagram shows the relationship between height h and ΔT(h). This diagram is a mapping curve of beam coverage time and height at different heights within a scanning cycle. In the diagram, the darker areas have longer beam coverage time, and the lighter areas have shorter beam coverage time. min The coverage time of nearby beams reaches the maximum value. And the coverage range of height is from 0 to H max Compared with the detection altitude range of the fixed beam working mode, the scanning mode can detect lower altitude layers.

[0082] An embodiment of the present invention further provides a fan-scan control device for an insect radar in the migration direction, comprising an insect radar control module, a priori information acquisition module and a profile fan-scan parameter determination module.

[0083] The insect radar control module is used to control the insect radar to perform pre-measurement of a set time at the initial moment to obtain prior information of the aerial migration state of the insect target and send it to the prior information acquisition module.

[0084] A priori information acquisition module is used to determine the direction θ0 of the insect migration direction of the insect migration based on the priori information and determine the maximum angular velocity ω of the target relative to the insect radar scan , and sent to the profile sector scanning parameter determination module.

[0085] The profile fan scanning parameter determination module sets the insect radar to perform profile fan scanning on the profile of the insect migration direction, sets the profile fan scanning parameters, and sends the profile fan scanning parameters to the insect radar control module; setting the profile fan scanning parameters includes: setting the insect radar fixed azimuth angle to θ0, scanning angular velocity to ω scan , and set the beam coverage time ΔT of different altitude layers of insect radar in profile sector scanning mode h different.

[0086] After receiving the profile sector scanning parameters, the insect radar control module controls the insect radar to perform profile sector scanning under the profile sector scanning parameters.

[0087] The device can not only realize the profile sector scanning method, improve the beam coverage and shorten the sampling period, but also the functional modules of the device are reasonably set. The modular design enables the radar interconnection part and the information solution part to be realized in different functional modules, which is more conducive to the real-time profile sector scanning method and improves the control efficiency.

[0088] The embodiment of the present invention also provides a statistical method for calculating insect migration flux based on an insect migration profile scanning mode.

[0089] According to the definition of migration flux: Assume that at time T n Time interval ΔT n , height h k Height interval Δhk , that is, within the defined minimum statistical unit (k, n), the radar detects an insect, then within the statistical unit, the calculation method of the migration flux flux′(k, n) is as follows:

[0090]

[0091] If within the minimum statistical unit (k,n), num is detected k,n For the first migratory insects, the flux statistics flux(k,n) is the sum of equation (10), and the calculation formula is as follows:

[0092]

[0093] Formula (11) is the calculation method of the migration flux flux (k, n) in the statistical unit (k, n). In the actual application of insect radar, it is often necessary to count the flux statistics of different altitude layers within a long period of time (N time statistical units). Formula (11) can be averaged in n time periods, and the calculation formula is:

[0094]

[0095] Formula (7) and (8) are statistical calculation methods for insect migration flux, where Δh k and ΔT n is a known statistical condition parameter. To obtain the flux statistics, it is necessary to know the longest beam-crossing distance D of all detected targets. i (k,n). According to Chapman JW et al. in the article “Vertical-Looking Radar: A New Tool for Monitoring High-Altitude Insect Migration”, D i (k,n) is determined by the RCS value measured by the target. The calculation formula is:

[0096]

[0097] Where R i is the distance between the target and the radar, θ 3db is the radar antenna beam width, δ i is the target RCS, C is the gain factor related to the radar hardware, SNR min is the target detection threshold.

[0098] Substituting formula (9) into formula (11), we can obtain the flux statistics calculation formula in the statistical unit:

[0099]

[0100] Where D i (k,n) can be obtained by formula (13).

[0101] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The profile sector scanning method of insect radar in the migration direction is characterized by: include: The insect radar performs a pre-measurement at a set time to obtain prior information on the aerial migration state of the insect target, and determines the direction θ0 of the insect migration direction based on the prior information, and determines the maximum angular velocity ω of the target relative to the insect radar. scan ; The insect radar is set to perform profile fan scanning on the profile of the insect migration direction, and the fixed azimuth angle of the insect radar is set to θ0 and the scanning angular velocity is set to ω scan ; And calculate the beam coverage dwell time ΔT(h) of different altitude layers of insect radar in profile sector scanning mode; The step of determining the concentrated direction θ0 of the insect migration direction of the insect migration based on the prior information specifically includes the following steps: The body axis orientation of the insect target is determined by PSM. After obtaining the body axis orientation of all insects in a statistical period, a data set with different orientations is obtained. A statistical distribution of all orientation angles in the data set is performed, and the peak value of the statistical result is obtained as the orientation θ0 where the insect migration direction is concentrated at this time. Determine the maximum angular velocity ω of the target relative to the insect radar scan for: Where V i is the tangential velocity of the insect target, h i Height of target for insects; If ω scan If the maximum speed allowed by the insect radar servo hardware is exceeded, the ω scan Set to the maximum servo speed; The insect radar is set to have different beam coverage times ΔT(h) at different altitudes in the profile sector scanning mode. Specifically, the functional relationship between the beam coverage height h and its dwell time ΔT(h) is: Where 0≤h≤R max , R min and R max They are respectively the closest detection distance and the farthest detection distance of the insect radar.

2. The method for scanning the profile of the insect radar in the migration direction as claimed in claim 1, characterized in that: The insect radar performs a pre-measurement of a set time to obtain prior information on the aerial migration status of insect targets, specifically: Perform vertical measurement within the set time, or set the insect radar to perform vertical measurement and profile scanning in a cycle alternating within the set time to obtain prior information on the aerial migration status.

3. The profile sector scanning method of insect radar in the migration direction as claimed in claim 1, characterized in that: The prior information of the insect target's migratory state in the air includes: the insect target's flight speed, altitude and target polarization scattering matrix PSM; The flight speed is the tangential flight speed of the insect target.

4. The fan-sweep control device of the insect radar in the migration direction is characterized by: It includes an insect radar control module, a priori information acquisition module and a profile sector scanning parameter determination module; The insect radar control module is used to control the insect radar to perform a pre-measurement of a set time at an initial moment to obtain a priori information of the aerial migration state of the insect target and send it to the priori information acquisition module; The prior information acquisition module is used to determine the direction θ0 of the insect migration direction of the insect migration based on the prior information, and determine the maximum angular velocity ω of the target relative to the insect radar scan , sent to the profile sector scanning parameter determination module; The profile fan scanning parameter determination module sets the insect radar to perform profile fan scanning on the profile of the insect migration direction, sets profile fan scanning parameters, and sends the profile fan scanning parameters to the insect radar control module; The setting of the profile sector scanning parameters includes: setting the fixed azimuth angle of the insect radar to θ0 and the scanning angular velocity to ω scan , and set the insect radar in profile sector scanning mode different altitude layer beam coverage dwell time ΔT (h) different; After receiving the profile sector scanning parameters, the insect radar control module controls the insect radar to perform profile sector scanning under the profile sector scanning parameters; Determine the maximum angular velocity ω of the target relative to the insect radar scan for: Where V i is the tangential velocity of the insect target, h i Height of target for insects; If ω scan If the maximum speed allowed by the insect radar servo hardware is exceeded, the ω scan Set to the maximum servo speed; Calculate the beam coverage time ΔT(h) of different altitude layers of the insect radar in the profile sector scanning mode. Specifically, the functional relationship between the beam coverage height h and its residence time ΔT(h) is: Where 0≤h≤R max , R min and R max They are respectively the closest detection distance and the farthest detection distance of the insect radar.

5. A migration flux statistical method, characterized in that: The steps include: S1: setting the profile sector scanning mode of the insect radar by the method described in claims 1 to 3; S2: Statistical analysis of insect migration flux based on the profile fan scanning mode, specifically: Set at time T n Time interval ΔT n , height h k Height interval Δh k , that is, the minimum statistical unit (k,n) defined. Within the statistical unit, the flux statistics are flux(k,n): In the smallest statistical unit (k,n), num k,n Migratory insects, D i (k,n) is the longest beam-crossing distance of the detected target, E[D i (k,n)] is D i (k,n), α is the elevation angle of the insect radar beam, h is the beam coverage height, R min and R max They are respectively the closest detection distance and the farthest detection distance of the insect radar.

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