Method for analyzing multipath scattering effect of offshore wind plant on passive radar system

Abstract

The invention relates to the technical field of wind power plant echo suppression, in particular to a method for analyzing the multipath scattering effect of an offshore wind plant on a passive radar system, and the method comprises the steps: constructing a novel sea condition offshore wind plant model; the offshore wind plant model comprises a model construction module, a simulation position design module and a sea condition program application macro module; calculating scattering superposition RCS of different wind turbines in the wind power plant under different incident angles based on the offshore wind power plant model; constructing a multipath scattering mathematical model of the offshore wind power plant according to the offshore wind power plant model and scattering superposition RCS of different wind turbines in the wind power plant; the multipath influence of the offshore wind power plant on the passive radar system is confirmed based on the multipath scattering mathematical model of the offshore wind power plant, and the method is of great significance to scientific estimation of the passive radar system by the multipath scattering effect of the wind power plant.

Description

Technical Field

[0001] The invention relates to the technical field of wind farm echo suppression, and in particular to a method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system. Background Art

[0002] Due to the vigorous development of the wind power industry, more and more wind farms (hereinafter referred to as wind farms) are being established, and the scale of wind farms and the structure of wind turbines are getting larger and larger. However, recent studies have shown that the main wind turbines in wind farms, due to their increasingly large structures and complex electromagnetic scattering characteristics, have gradually become more prominent in their impact on various radars, navigation and monitoring equipment, and have had a certain impact on the working security of electronic equipment. Foreign developed countries, such as the United States, the United Kingdom, Germany and Spain, have begun to study the interference of wind farms to radars, in order to provide technical support for the site selection of wind farms and the suppression of wind farm interference.

[0003] Due to the huge structure of the wind turbine, the RCS of the wind turbine is very large, and in some cases it can exceed the RCS of a Boeing 747 aircraft, causing a multipath scattering effect, which can cause false alarms or false target echo information to the radar receiver.

[0004] At present, the method of simulating the multipath interference of echoes of offshore wind farms by radar, navigation and monitoring equipment mainly simulates the state of a single wind turbine in free space, and then calculates and analyzes the multipath impact of the entire wind farm based on the RCS of the single wind turbine state. For the RCS of wind turbines in different states under different sea conditions in the entire offshore wind farm, it is difficult to perform quantitative simulation calculations with existing simulation technology. Therefore, constructing an offshore wind farm model with a new sea condition, calculating the scattered superposition RCS of different wind turbines in the wind farm under different incident angles, and simulating and analyzing the multipath impact of offshore wind farms on electronic equipment such as radars is the basis for the interference protection of wind farms against electronic equipment such as radars. Summary of the invention

[0005] The purpose of the present invention is to provide a method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system, so as to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system, the method comprising:

[0008] Constructing a new offshore wind farm model under sea conditions; the offshore wind farm model includes a model construction module, a simulation location design module and a sea condition program application macro module;

[0009] Based on the offshore wind farm model, the scattered superposition RCS of different wind turbines in the wind farm under different incident angles is calculated;

[0010] The offshore wind farm multipath scattering mathematical model is constructed based on the offshore wind farm model and the scattering superposition RCS of different wind turbines in the wind farm;

[0011] The multipath impact of offshore wind farms on passive radar systems is confirmed based on the mathematical model of offshore wind farm multipath scattering.

[0012] Preferably, the model building module includes:

[0013] Obtaining an aerodynamic model of a wind turbine blade, the principle of which mainly includes blade geometry parameters and aerodynamic force analysis, and is used to convert wind energy in the atmosphere into rotational energy, and transmit it to a generator through a rotating shaft to generate electrical energy;

[0014] Based on the aerodynamic model of the wind turbine blades, a separate wind turbine entity model is established using 3D modeling software (SolidWorks, UG, etc.), wherein the components of the separate wind turbine entity model mainly include a tower, blades, a nacelle, and a hub;

[0015] The individual wind turbine entity models are saved as model output files, where different wind turbine postures can be adjusted by adjusting the angles of the wind turbine blades.

[0016] Preferably, the simulation position design module includes:

[0017] By connecting the array information of wind turbines in offshore wind farms to electromagnetic simulation software (FEKO, CST, etc.) and converting it into rectangular coordinate information; and then setting the radiation source target azimuth and radar receiving azimuth, the required offshore wind farm simulation scenario is obtained.

[0018] Preferably, the sea condition program application macro module includes:

[0019] To set a general sea condition scenario, you can simulate the sea spectrum model to achieve different sea conditions or build a simple automatic model through the macro library of electromagnetic simulation software;

[0020] When simulating different sea conditions with the macro library of electromagnetic simulation software, the complex sea conditions can be simplified, which is conducive to building an offshore wind farm model. The simplified calculation of electromagnetic parameters can reduce the calculation time and the use of computing resources.

[0021] Offshore wind farms are set up according to different sea conditions: the wave height range for level 1 sea conditions is 0-0.1m; the wave height range for level 2 sea conditions is 0.1-0.5m; the wave height range for level 3 sea conditions is 0.5-1.25m; the wave height range for level 4 sea conditions is 1.25-2.5m; the wave height range for level 5 sea conditions is 2.5-4.0m; the wave height range for level 6 sea conditions is 4.0-6.0m; the wave height range for level 7 sea conditions is 6.9m; the wave height range for level 8 sea conditions is 9-14m; and the wave height for level 9 sea conditions is greater than 14m.

[0022] Preferably, the scattering superposition RCS of different wind turbines in the wind farm at different incident angles is calculated based on the offshore wind farm model, including:

[0023] Based on the offshore wind farm model, the RCS of the offshore wind farm with different wind turbines superimposed at different incident angles is calculated using electromagnetic simulation software, and the RCS of the wind farm under the radar line of sight is calculated using the ray-launching geometric optics algorithm; the electromagnetic simulation software includes but is not limited to FEKO and CST;

[0024] The maximum number of reflections corresponding to the ray emission geometric optics algorithm is set according to the echo path constructed between the radar, the wind turbine and the reflector (the sea surface or other wind turbines). The maximum number of ray reflections is limited to be consistent with the multipath model, and the complex and disordered scattering is simplified, which simplifies the calculation complexity and is more conducive to the final ray tracing display;

[0025] The echoes of the wind farm model during multiple scattering are obtained, and the RCS size of the offshore wind farm at this time is calculated.

[0026] Preferably, a mathematical model of multipath scattering of an offshore wind farm is constructed based on the offshore wind farm model and the scattering superposition RCS of different wind turbines in the wind farm, including:

[0027] Get the detection target of the passive radar system, set the detection target of the passive radar system as point G, confirm that the distance between the detection target and the passive radar system is R1, the distance between the detection target and the wind farm is R2, and confirm that the transmission power of the detection target is P t , the antenna gain is G t ;

[0028] According to the signal power density from the marine radiation source target to the passive radar system antenna: The passive radar system receives the emission signal of the target at sea: P r1 =S1·A e ;

[0029] Among them, A e Represents the passive radar system antenna area;

[0030] The power density of the signal radiated by the offshore radiation source target reaching the wind farm is calculated as:

[0031] The power density of the multipath reflected signal received by the passive radar system through the wind farm is calculated as: The power of the multipath reflected signal received by the passive radar system through the wind farm is: P r2 =S3·A e ;

[0032] Among them, σ represents the RCS of the offshore wind farm received by the bistatic radar, and R3 represents the distance from the wind farm to the passive radar system;

[0033] Then the multipath scattered signal power P received by the passive radar system is obtained r2 The received radiation source signal power P r1 The ratio is:

[0034] At this time, α is used as the mathematical model of multipath scattering in offshore wind farms.

[0035] Preferably, confirming the multipath impact of the offshore wind farm on the passive radar system based on the offshore wind farm multipath scattering mathematical model includes:

[0036] The RCS of the offshore wind farm with different wind turbines superimposed at different incident angles within the passive radar frequency range is obtained, and the relationship diagram of the power density ratio of the direct wave and the refracted wave of the target radiation source is confirmed based on the mathematical model of multipath scattering of the offshore wind farm. Then, the multipath impact of the offshore wind farm on the passive radar system is confirmed based on the relationship diagram of the power density ratio of the direct wave and the refracted wave of the target radiation source.

[0037] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps in the above-mentioned method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system.

[0038] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the program, the steps in the above-mentioned method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system are implemented.

[0039] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0040] When simulating different sea conditions and sea surfaces by using a macro class library of electromagnetic simulation software, the present invention simplifies the complex sea conditions, which is beneficial to constructing an offshore wind farm model. The simplified calculation of electromagnetic parameters can reduce the calculation time and reduce the utilization of computing resources. By setting the maximum number of reflections corresponding to the ray emission geometric optics algorithm according to the echo path constructed between the radar, the wind turbine and the reflector, the complex and disordered scattering is simplified, which simplifies the calculation complexity and is more conducive to the final ray tracing display. Through model establishment and computational simulation, the influence of the wind farm on the radiation signal of the radiation source target is obtained, which is of great significance for scientifically estimating the multipath scattering effect of the wind farm on the passive radar system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0042] Figure 1 It is a flow chart of a method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system of the present invention;

[0043] Figure 2 It is the main components and overall three-dimensional solid model of the wind turbine;

[0044] Figure 3 This is a schematic diagram of the macro module for the sea condition program application;

[0045] Figure 4 This is a schematic diagram of the wind farm simulation location scenario;

[0046] Figure 5 Schematic diagram of the multipath effect inside a wind turbine;

[0047] Figure 6 This is a schematic diagram of the maximum number of reflections;

[0048] Figure 7 Display schematics for ray tracing;

[0049] Figure 8 This is the RCS curve of electromagnetic radiation in the offshore wind farm scenario;

[0050] Fig. 9 is a schematic diagram of the overall echo path;

[0051] Fig.10 It is the relationship diagram of the power density ratio of direct wave and refracted wave of the target radiation source; DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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.

[0053] See also Figure 1-Figure 10 , the present invention provides a technical solution:

[0054] Embodiment 1:

[0055] A method for analyzing the impact of offshore wind farms on multipath scattering effects of passive radar systems. The specific implementation steps include establishing an offshore wind farm model under a new sea condition, calculating the superposition RCS of scattering of different wind turbines in the wind farm under different incident angles, establishing a mathematical model of multipath scattering of offshore wind farms, and analyzing the multipath impact of offshore wind farms on passive radar systems. The flowchart is as follows Figure 1 As shown;

[0056] S1. Constructing a new offshore wind farm model under sea conditions; the offshore wind farm model includes a model construction module, a simulation location design module and a sea condition program application macro module;

[0057] Preferably, to establish an offshore wind farm model for a new sea condition, a wind turbine blade model can be established based on the aerodynamic model of the wind turbine blade, and then a separate wind turbine solid model (including tower, blades, nacelle, hub and other components) can be established through 3D modeling software (SolidWorks, UG, etc.), and saved as a model output file, wherein different wind turbine postures can be adjusted by adjusting the angle of the wind turbine blades. Here, the wind turbine blades are set to rotate to a state parallel to the plane of the nacelle, that is, the angle between the blades and the plane where the nacelle is located is 0°. The main components of the wind turbine and the overall 3D solid model are shown in the figure. Figure 2 The wind turbine parameter settings are shown in the following table:

[0058]

[0059] Preferably, when establishing an offshore wind farm model for a new sea condition, the general sea condition scenario can be set by simulating the sea spectrum model to achieve different sea conditions or by using the macro class library of the electromagnetic simulation software to build a simple automatic model. When simulating different sea conditions with the macro class library of the electromagnetic simulation software, the sea conditions of the offshore wind farm such as wave height and wave period can be set autonomously according to different sea conditions. The schematic diagram of the sea condition program application macro module is as follows: Figure 3 The sea condition simulation module simplifies the complex sea conditions, which is conducive to building an offshore wind farm model. The simplified calculation of electromagnetic parameters can reduce the calculation time and reduce the use of computing resources.

[0060] Preferably, the offshore wind farm is set up according to different sea conditions: the wave height range of level 1 sea condition is 0-0.1m; the wave height range of level 2 sea condition is 0.1-0.5m; the wave height range of level 3 sea condition is 0.5-1.25m; the wave height range of level 4 sea condition is 1.25-2.5m; the wave height range of level 5 sea condition is 2.5-4.0m; the wave height range of level 6 sea condition is 4.0-6.0m; the wave height range of level 7 sea condition is 6.9m; the wave height range of level 8 sea condition is 9-14m; the wave height of level 9 sea condition is greater than 14m.

[0061] Preferably, a new offshore wind farm model is established for a new sea condition, and the array information of wind turbines in the offshore wind farm is connected to the simulation software as required and converted into rectangular coordinate information. After setting the radiation source target orientation and the radar receiving orientation, the required offshore wind farm simulation scenario is obtained. Figure 4 Shown is a hypothetical simulation location scenario.

[0062] S2. Calculate the scattered superposition RCS of different wind turbines in the wind farm at different incident angles based on the offshore wind farm model;

[0063] Preferably, the scattered superposition RCS of different wind turbines in the wind farm at different incident angles is calculated, and the RCS of the offshore wind farm superimposed with different wind turbines at different incident angles is calculated using electromagnetic simulation software, wherein the electromagnetic simulation software includes but is not limited to FEKO and CST, etc., and the ray emission geometric optics algorithm is used to calculate the RCS of the wind farm under the radar line of sight.

[0064] Preferably, the maximum number of reflections corresponding to the ray emission geometric optics algorithm is set according to the echo path constructed between the radar, the wind turbine and the reflector (sea surface or other wind turbine), and the echo path of the first three reflections is selected to obtain a multipath echo path schematic diagram as shown in Figure 5 shown.

[0065] Preferably, the maximum number of reflections corresponding to the geometric optics algorithm for limiting the ray emission is consistent with the multipath echo path obtained by the echo path, which is 3 times. The algorithm setting diagram is as follows: Figure 6 shown.

[0066] Preferably, the echoes of the wind farm model during multiple scattering are obtained, and the ray tracing thereof is shown as follows: Figure 7 As shown, the RCS size of the offshore wind farm is calculated, and the result is as follows Figure 8 shown.

[0067] S3. Construct a mathematical model of multipath scattering of offshore wind farms based on the offshore wind farm model and the scattering superposition RCS of different wind turbines in the wind farm;

[0068] Preferably, a multipath scattering mathematical model is established, and its echo path map is as follows: Fig. 9As shown in the figure, the offshore wind farm is assumed to be located in the northeast direction of the radar system, the wind farm array is arranged with an internal arrangement interval of 250m, and the offshore radiation source moves in the southeast direction of the wind farm. The passive radar is about 30km away from the offshore wind farm, and the offshore radiation source target is about 37km away from the offshore wind farm.

[0069] Preferably, the parameter settings include:

[0070] Simple model settings for the sea surface: Maximum wave height: set the maximum wave height to 0.5m; Wavelength range: set the wavelength range to 1m; Sea surface shape: select the sea surface shape as a rectangle; Sea surface size: finally generate a simple sea surface model of 1000*1000m;

[0071] Offshore radiation source target setting: Offshore radiation source target position: set at the wind farm azimuth angle 40° and pitch angle 88°;

[0072] Passive radar settings: Passive radar position: set at the wind farm azimuth angle of 300° and elevation angle of 80°;

[0073] Ray Launch Geometric Optics Algorithm Settings: Ray Launch Geometric Optics Algorithm Parameters: Select the maximum number of interactive reflections of the ray of the ray launch geometric optics algorithm to be 3 times; Ray Launch Geometric Optics Algorithm Advanced Settings: Add edge and wedge diffraction; Ray Launch Geometric Optics Algorithm Ray Launch Settings: Set to the normal number of rays emitted by adaptive light;

[0074] Get the detection target of the passive radar system, set the detection target of the passive radar system as point G, confirm that the distance between the detection target and the passive radar system is R1, the distance between the detection target and the wind farm is R2, and confirm that the transmission power of the detection target is P t , the antenna gain is G t ;

[0075] According to the signal power density from the marine radiation source target to the passive radar system antenna: The passive radar system receives the emission signal of the target at sea: P r1 =S1·A e ;

[0076] Among them, A e Represents the passive radar system antenna area;

[0077] The power density of the signal radiated by the offshore radiation source target reaching the wind farm is calculated as:

[0078] The power density of the multipath reflected signal received by the passive radar system through the wind farm is calculated as: The power of the multipath reflected signal received by the passive radar system through the wind farm is: Pr2 =S3·A e ;

[0079] Among them, σ represents the RCS of the offshore wind farm received by the bistatic radar, and R3 represents the distance from the wind farm to the passive radar system;

[0080] Then the multipath scattered signal power P received by the passive radar system is obtained r2 The received radiation source signal power P r1 The ratio is:

[0081] At this time, α is used as the mathematical model of multipath scattering in offshore wind farms.

[0082] S4. Confirm the multipath impact of offshore wind farms on passive radar systems based on the mathematical model of offshore wind farm multipath scattering;

[0083] Preferably, the relationship diagram of the power density ratio of the direct wave and the refracted wave of the target radiation source is obtained by calculation using MatLab software, such as Fig.10 As shown;

[0084] Obtain the RCS of offshore wind farms with different wind turbines superimposed at different incident angles within the passive radar frequency range, and confirm the relationship diagram of the power density ratio of direct wave and refracted wave of the target radiation source based on the mathematical model of multipath scattering of offshore wind farms. Then, confirm the multipath impact of offshore wind farms on the passive radar system based on the relationship diagram of the power density ratio of direct wave and refracted wave of the target radiation source;

[0085] From the figure, it can be found that the power ratio of the scattered wave to the direct wave of the radiation source signal reaching the passive radar system after being scattered by the wind turbines in the wind farm varies with the RCS caused by the position of the target radiation source. When the number of wind turbines in the radar line of sight is small and the incident angle of the incident wave corresponds to a small RCS, the multipath effect caused is minimal.

[0086] Embodiment 2:

[0087] The computer-readable storage medium of this embodiment stores a computer program thereon, and when the program is executed by a processor, the steps in the method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system in embodiment 1 are implemented.

[0088] The computer-readable storage medium of this embodiment may be an internal storage unit of the terminal, such as a hard disk or memory of the terminal; the computer-readable storage medium of this embodiment may also be an external storage device of the terminal, such as a plug-in hard disk, a smart memory card, a secure digital card, a flash memory card, etc. equipped on the terminal; further, the computer-readable storage medium may also include both an internal storage unit of the terminal and an external storage device.

[0089] The computer-readable storage medium of this embodiment is used to store computer programs and other programs and data required by the terminal. The computer-readable storage medium can also be used to temporarily store data that has been output or is to be output.

[0090] Embodiment 3:

[0091] The computer device of this embodiment includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the steps in the method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system in Embodiment 1 are implemented.

[0092] In this embodiment, the processor may be a central processing unit, or other general-purpose processors, digital signal processors, application-specific integrated circuits, readily available programmable gate arrays or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The memory may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include a non-volatile random access memory. For example, the memory may also store information about the device type.

[0093] Those skilled in the art will appreciate that the disclosed content of the embodiments may be provided as methods, systems, or computer program products. Therefore, the present solution may adopt the form of hardware embodiments, software embodiments, or embodiments combining software and hardware. Moreover, the present solution may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program codes.

[0094] The present solution is described with reference to the method according to the embodiment of the present solution and the flowchart and / or block diagram of the computer program product. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions; these computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 one or more processes and / or methods Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0095] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 one or more processes and / or methods Figure 1 A function specified in one or more boxes.

[0096] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 one or more processes and / or methods Figure 1 The steps for the functions specified in one or more boxes.

[0097] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM).

[0098] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system, characterized in that: The method comprises: Constructing a new offshore wind farm model under sea conditions; the offshore wind farm model includes a model construction module, a simulation location design module and a sea condition program application macro module; Based on the offshore wind farm model, the scattered superposition RCS of different wind turbines in the wind farm under different incident angles is calculated; The offshore wind farm multipath scattering mathematical model is constructed based on the offshore wind farm model and the scattering superposition RCS of different wind turbines in the wind farm; The multipath impact of offshore wind farms on passive radar systems is confirmed based on the mathematical model of offshore wind farm multipath scattering.

2. A method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system as claimed in claim 1, characterized in that: The model building module comprises: Obtaining an aerodynamic model of a wind turbine blade, the principle of which mainly includes blade geometry parameters and aerodynamic force analysis, and is used to convert wind energy in the atmosphere into rotational energy, and transmit it to a generator through a rotating shaft to generate electrical energy; Based on the aerodynamic model of the wind turbine blades, a separate wind turbine entity model is established using three-dimensional modeling software, wherein the components of the separate wind turbine entity model mainly include a tower, blades, a nacelle and a hub; The individual wind turbine entity models are saved as model output files, where different wind turbine postures can be adjusted by adjusting the angles of the wind turbine blades.

3. The method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system according to claim 1, characterized in that: The simulation position design module comprises: By connecting the array information of wind turbines in the offshore wind farm to the electromagnetic simulation software and converting it into rectangular coordinate information; and then setting the radiation source target orientation and radar receiving orientation, the required offshore wind farm simulation scenario is obtained.

4. The method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system according to claim 1, characterized in that: The sea condition program application macro module includes: To set a general sea condition scenario, you can simulate the sea spectrum model to achieve different sea conditions or build a simple automatic model through the macro library of electromagnetic simulation software; When simulating different sea conditions and sea surfaces with the macro library of electromagnetic simulation software, complex sea conditions can be simplified; Offshore wind farms are set up according to different sea conditions: the wave height range for level 1 sea conditions is 0-0.1m; the wave height range for level 2 sea conditions is 0.1-0.5m; the wave height range for level 3 sea conditions is 0.5-1.25m; the wave height range for level 4 sea conditions is 1.25-2.5m; the wave height range for level 5 sea conditions is 2.5-4.0m; the wave height range for level 6 sea conditions is 4.0-6.0m; the wave height range for level 7 sea conditions is 6.9m; the wave height range for level 8 sea conditions is 9-14m; and the wave height for level 9 sea conditions is greater than 14m.

5. The method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system according to claim 1, characterized in that: The calculation of the scattered superposition RCS of different wind turbines in the wind farm at different incident angles based on the offshore wind farm model includes: Based on the offshore wind farm model, electromagnetic simulation software is used to calculate the RCS of offshore wind farms with different wind turbines superimposed at different incident angles, and the ray-launching geometric optics algorithm is used to calculate the RCS of the wind farm under the radar line of sight; The maximum number of reflections corresponding to the ray emission geometric optics algorithm is set according to the echo path constructed between the radar, the wind turbine and the reflector, wherein the maximum number of ray reflections is limited to be consistent with the multipath model; The echoes of the wind farm model during multiple scattering are obtained, and the RCS size of the offshore wind farm at this time is calculated.

6. The method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system according to claim 1, characterized in that: The offshore wind farm multipath scattering mathematical model is constructed based on the offshore wind farm model and the scattering superposition RCS of different wind turbines in the wind farm, including: Get the detection target of the passive radar system, set the detection target of the passive radar system as point G, confirm that the distance between the detection target and the passive radar system is R1, the distance between the detection target and the wind farm is R2, and confirm that the transmission power of the detection target is P t , the antenna gain is G t ; According to the signal power density from the marine radiation source target to the passive radar system antenna: The passive radar system receives the emission signal of the target at sea: P r1 =S1·A e ; Among them, A e Represents the passive radar system antenna area; The power density of the signal radiated by the offshore radiation source target reaching the wind farm is calculated as: The power density of the multipath reflected signal received by the passive radar system through the wind farm is calculated as: The power of the multipath reflected signal received by the passive radar system through the wind farm is: P r2 =S3·A e ; Among them, σ represents the RCS of the offshore wind farm received by the bistatic radar, and R3 represents the distance from the wind farm to the passive radar system; Then the multipath scattered signal power P received by the passive radar system is obtained r2 The received radiation source signal power P r1 The ratio is: At this time, α is used as the mathematical model of multipath scattering in offshore wind farms.

7. The method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system according to claim 1, characterized in that: The method of confirming the multipath impact of offshore wind farms on passive radar systems based on a mathematical model of offshore wind farm multipath scattering includes: The RCS of the offshore wind farm with different wind turbines superimposed at different incident angles within the passive radar frequency range is obtained, and the relationship diagram of the power density ratio of the direct wave and the refracted wave of the target radiation source is confirmed based on the mathematical model of multipath scattering of the offshore wind farm. Then, the multipath impact of the offshore wind farm on the passive radar system is confirmed based on the relationship diagram of the power density ratio of the direct wave and the refracted wave of the target radiation source.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps in a method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system as described in any one of claims 1 to 7 are implemented.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps in the method for analyzing the multipath scattering effect of an offshore wind farm on a passive radar system as described in any one of claims 1-8 are implemented.

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