Sea surface and chaff coupling electromagnetic scattering simulation method, device and equipment and application thereof

Abstract

The invention discloses a sea surface and chaff coupling electromagnetic scattering simulation method, device and equipment and application thereof, relates to the field of radars, and is used for integrating electromagnetic scattering simulation analysis functions of various coupling scenes in the same simulation platform. A third module is designed in the system to display a plurality of coupling scenes to be selected, a fourth module is designed to respond to the selected coupling scene, and an electromagnetic scattering simulation task under the coupling scene is carried out in an independent page. For a sea surface and low-altitude chaff coupling scene, radar parameters, chaff parameters and sea surface parameters are set, a sea surface model is established according to the sea surface parameters, a chaff interference model is loaded in the sea surface model according to the chaff parameters, and electromagnetic scattering calculation is performed according to the radar parameters. According to the method, the blank that coupling scattering of the multi-scene complex electromagnetic environment is analyzed on the same simulation platform is filled up, and compared with actual measurement, the measurement cost is reduced, and the confidentiality is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of radar technology, and particularly to a sea surface and chaff coupled electromagnetic scattering simulation method, device, equipment and application thereof. BACKGROUND

[0002] Complex electromagnetic environment is the main feature of battlefield informatization. Under the complex electromagnetic environment, efficiently and accurately obtaining the electromagnetic scattering characteristic data of the coupling between the environment and the target is the first step for detecting, identifying and classifying the targets in the radar coverage system. The research on the simulation of the target / jamming coupled RCS (electromagnetic scattering cross section) under the complex environment plays an important guiding role in the detection and evaluation of battlefield targets, the deployment and evaluation of jamming systems and the analysis of coupled electromagnetic scattering transmission mechanism. In addition, by analyzing the coupled electromagnetic scattering characteristics under the complex environment, the special complex electromagnetic environment can be more fully utilized to construct the electromagnetic situation, and the base station signal transmission and the detection of land and sea natural resources under the complex electromagnetic environment can be more effectively carried out.

[0003] The research on the complex electromagnetic environment multi-element coupled electromagnetic scattering technology usually includes experimental measurement and simulation research. The experimental measurement technology of the target / jamming under the complex environment is limited by the natural weather and difficult to reproduce the specific scene, and the measurement cost is high. The coupled electromagnetic scattering simulation technology of the target / jamming under the complex electromagnetic environment is based on the electromagnetic coupling mechanism between the environment background and the target to be measured, and summarizes the transformation theory of the electromagnetic environment influence with the change of the environment elements on the basis of the experimental measurement, which can effectively simulate the complex electromagnetic environment under various complex electromagnetic scenes and various environment elements.

[0004] In recent years, the increasing concern about the strategic position of the sea makes the research of sea surface electromagnetic analysis urgent and practical. The sea combat environment has a decisive influence on the performance of radar. The sea surface echo is usually very strong, so in many cases, the detection capability of radar is not limited by the receiver noise, but by the scattered echo from the sea surface. In order to improve the detection and identification capability of radar for ship targets, we must first fully understand the electromagnetic scattering characteristics of ships, especially the mechanism and process of the interaction between the sea environment and ship targets under radar illumination. This is the value of the research on the composite electromagnetic scattering of sea surface and ship targets in the field of marine remote sensing. Moreover, considering the increasingly severe situation of territorial disputes near the coast, and the fact that coastal cities are important economic and population centers, we need to take advantage of the complexity of the coastal and island environments to make the islands the last line of defense for entering the land. This highlights the strategic significance of target coupling analysis in island environments, which is comparable to sea surface electromagnetic scattering analysis. Target coupling scattering analysis in ground environments is a difficult point in the research of down-looking target tracking, detection, and identification. Ground clutter has an important influence on the use of weapons. First, it affects the detection performance of various early warning radars for targets. For example, the influence of ground clutter on the detection of ground targets such as tanks and armored vehicles is manifested in two aspects. On the one hand, strong clutter reduces the signal-to-clutter ratio of target detection, and in severe cases, it can drown out the target signal, thereby reducing the detection probability of the target. On the other hand, clutter sometimes exhibits characteristics similar to those of targets, thereby increasing the false alarm rate of radars. In summary, coupling scattering analysis in various scenarios such as sea, island, and ground environments has special strategic significance.

[0005] With the development of electronic warfare jamming systems, the theory of complex electromagnetic environment and passive jamming coupling electromagnetic scattering is becoming increasingly important. Chaff and corner reflector jammers are widely used because of their effectiveness and high cost performance. For example, by taking advantage of the strong RCS characteristics of corner reflectors, a corner reflector floating on the sea surface can create a false target deception jamming. The strong return amplitude of the corner reflector can reduce the probability of a high-value target being detected by the opponent's radar. By mixing true and false targets, the probability of a high-value target being correctly identified, tracked, and damaged by the opponent's radar is reduced. By changing the electromagnetic scattering characteristics of the environment, the opponent's terrain matching and battlefield environment information processing system is disturbed. Low-altitude chaff is mainly used to simulate chaff dilution and chaff centroid jamming results, and is also used to interfere with the identification of important targets. Sometimes, in order to evaluate the actual jamming performance of chaff or corner reflectors in a sea surface scenario, a large amount of radar jamming return data in a complex electromagnetic environment is needed. If these data are obtained through field tests with real objects, such as the known vector transport theory for calculating sea background chaff cloud scattering, the cost will be very high, and the confidentiality of jamming effectiveness evaluation will be affected. Therefore, by using complex electromagnetic environment multi-factor coupling electromagnetic scattering simulation technology to obtain radar jamming return signals in the scenario, simulation instead of real objects can greatly reduce testing costs and time.

[0006] The simulation of multi-factor coupled electromagnetic scattering in complex electromagnetic environment needs to consider multiple scenes, multiple targets or interferences and complex environmental factors, which brings several problems. First, different scenes such as sea surface, ground and island shore have different electromagnetic field bands and different application directions, so that the algorithms used in various scenes are different, and some algorithms cannot be compatible in the same platform or even the same programming environment. Second, the complex and multi-factor environmental parameters make the environmental modeling, target / interference deployment and coupled electromagnetic scattering calculation in complex scenes further difficult, because the environmental modeling not only involves model subdivision, but also involves the cross integration of fluid mechanics, materials science, random process and other disciplines with electromagnetics. Therefore, in the existing technology, most of the inventions can only achieve coupled electromagnetic scattering calculation for a single scene and a single type of target, but to further approach the electromagnetic scattering calculation of coupled targets in complex electromagnetic environment in real scenes, it is necessary to develop and integrate coupled electromagnetic scattering calculation technologies in multiple scenes. This has important significance for the analysis of target coupling scattering in complex electromagnetic environment, informationized battlefield interference and anti-interference effectiveness evaluation.

[0007] In general, the existing technology has the following problems: (1) The experimental measurement cost of target coupling scattering analysis in complex electromagnetic environment is high, depends on natural weather, and is difficult to reproduce.

[0008] (2) The analysis of chaff / angle decoy interference effectiveness in complex electromagnetic environment requires a large amount of echo data, which is costly and affects confidentiality if obtained through field experiment measurement.

[0009] (3) Due to the differences in analysis algorithms, programming languages and programming environments of different coupling scenes, most of the existing technologies are for single-scene and single-type target complex environment coupled electromagnetic scattering calculation, and there is no integrated multi-system, multi-scene, multi-factor and multi-target coupling scattering analysis. SUMMARY

[0010] The purpose of the present application is to provide a sea surface and chaff coupled electromagnetic scattering simulation method, device, equipment and its application to integrate multiple coupling scene electromagnetic scattering simulation analysis functions in the same simulation platform, and to propose an electromagnetic scattering simulation method for sea surface and low-altitude chaff coupling scene, so as to solve the problems of high cost and low confidentiality in actual measurement.

[0011] The technical solution adopted by the present application is as follows: A sea surface and chaff coupled electromagnetic scattering simulation method comprises: setting radar parameters, chaff parameters and sea surface parameters; According to the sea surface parameters, a sea surface model is established, according to the chaff parameters, a chaff interference model is loaded in the sea surface model, and according to the radar parameters, electromagnetic scattering calculation is performed; The method for performing electromagnetic scattering calculation comprises: The electromagnetic scattering intensity of the chaff interference model under the action of a detection signal is calculated by using a vector transport theory method; the detection signal is simulated according to the radar parameters; Based on the electromagnetic scattering intensity, the electromagnetic scattering cross section of the chaff interference model is calculated by using a Monte Carlo method. In addition, the application further provides a sea surface and chaff coupling electromagnetic scattering simulation device, which comprises: A first module is configured to set radar parameters, chaff parameters and sea surface parameters; A second module is configured to establish a sea surface model according to the sea surface parameters, load a chaff interference model in the sea surface model according to the chaff parameters, and perform electromagnetic scattering calculation according to the radar parameters; The second module performs electromagnetic scattering calculation according to the following configuration: The electromagnetic scattering intensity of the chaff interference model under the action of a detection signal is calculated by using a vector transport theory method; the detection signal is simulated according to the radar parameters; Based on the electromagnetic scattering intensity, the electromagnetic scattering cross section of the chaff interference model is calculated by using a Monte Carlo method.

[0012] In addition, the application further provides a sea surface and chaff coupling electromagnetic scattering simulation device, which comprises a processor and a storage medium, the storage medium stores computer instructions, and the processor executes the computer instructions to perform the sea surface and chaff coupling electromagnetic scattering simulation method.

[0013] In another aspect, the application further provides a complex environment electromagnetic scattering simulation system, which comprises: A third module is configured to display a coupling scene to be selected, the coupling scene comprising sea surface and ship target coupling, sea surface and corner reflection jamming coupling, sea surface and low-altitude chaff coupling, island and complex target coupling and ground and armored target coupling; A fourth module is configured to perform an electromagnetic scattering simulation task in a selected coupling scene in a separate page; when the selected coupling scene is sea surface and low-altitude chaff coupling, the fourth module performs the sea surface and chaff coupling electromagnetic scattering simulation method.

[0014] As described above, due to the adoption of the above technical solutions, the application has the following beneficial effects: The complex environment electromagnetic scattering simulation system provided in the application integrates multiple coupling scene electromagnetic scattering analysis functions in the same simulation platform, fills the blank of multi-scene complex electromagnetic environment coupling scattering analysis in the same simulation platform, and does not need to switch between different systems when facing electromagnetic scattering analysis requirements of different coupling scenes. In addition, the system is easy to operate, and can complete electromagnetic scattering simulation in the corresponding coupling scene without complex configuration, with low operation difficulty and good user experience. The sea surface and chaff coupling electromagnetic scattering simulation scheme provided in the application can save manpower and material costs compared with the actual measurement method, and can reproduce the test environment to improve the confidentiality of electromagnetic scattering analysis. In addition, the sea surface and chaff coupling electromagnetic scattering simulation scheme of the application performs tracking analysis on the radar detection signal, improves the interpretability of the analysis result compared with the actual measurement method, and can design and change the configuration parameters according to the needs, improving the flexibility of scattering effect analysis. BRIEF DESCRIPTION OF DRAWINGS

[0015] The application will be described by way of example and with reference to the accompanying drawings, in which: Figure 1 is an interface schematic diagram of a third module of the complex environment electromagnetic scattering simulation system provided by the embodiment of the application.

[0016] Figure 2 is an interface schematic diagram of the fourth module after the complex environment electromagnetic scattering simulation system in the embodiment of the application enters the "sea surface and ship target coupling" scene.

[0017] Figure 3 is a schematic diagram of "calculation results" in the embodiment of the application.

[0018] Figure 4 is an interface schematic diagram of the fourth module after the complex environment electromagnetic scattering simulation system in the embodiment of the application enters the "sea surface and corner reflector jamming coupling" scene.

[0019] Figure 5 is an interface schematic diagram of the fourth module after the complex environment electromagnetic scattering simulation system in the embodiment of the application enters the "sea surface and low-altitude chaff coupling" scene.

[0020] Figure 6 is an interface schematic diagram of the fourth module after the complex environment electromagnetic scattering simulation system in the embodiment of the application enters the "island and complex target coupling" scene.

[0021] Figure 7 is an interface schematic diagram of the fourth module after the complex environment electromagnetic scattering simulation system in the embodiment of the application enters the "ground and armored target coupling" scene.

[0022] Figure 8is a flow chart of a sea surface and chaff coupling electromagnetic scattering simulation method provided by an embodiment of the present application.

[0023] Figure 9 is a coordinate schematic diagram of a chaff jamming model in an embodiment of the present application.

[0024] Figure 10 is a flow chart of electromagnetic scattering intensity calculation in an embodiment of the present application. DETAILED DESCRIPTION

[0025] All features disclosed in this specification, and / or all steps of any methods or processes disclosed in this specification, can be combined in any manner, except where such a combination is not technically possible.

[0026] Any feature disclosed in this specification, unless stated otherwise, can be replaced by alternative features serving the same, equivalent or similar purpose, to achieve the same, equivalent or similar result.

[0027] In view of the problems of high test cost and low security caused by actual test mode for current electromagnetic scattering analysis of complex environment, and the problems of high development cost and inconvenient operation caused by the fact that different analysis tools need to be developed and selected respectively for different coupling scenarios in the current simulation test mode, an electromagnetic scattering simulation system for complex environment is proposed in the embodiments of the present application, which aims to solve the problems of high cost and low security in actual test by simulation mode, and at the same time, integrates electromagnetic scattering analysis functions of multiple coupling scenarios on the same simulation platform, so as to reduce the complexity of user operation and improve the flexibility of use.

[0028] The electromagnetic scattering simulation system for complex environment proposed in the embodiments of the present application comprises: A scenario selection module (i.e., the third module) is configured to display coupling scenarios to be selected, which include five coupling scenarios, i.e., sea surface and ship target coupling, sea surface and corner reflector jamming coupling, sea surface and low-altitude chaff coupling, island shore and complex target coupling, and ground and armored target coupling, as shown in FIG. 1. Figure 1 As the detection signal bands of different coupling scenarios are different, the application directions are different, and the simulation methods used in different coupling scenarios are different, they cannot be compatible and run in the same platform or even the same programming environment. In the embodiments of the present application, a unified programming and function interface specification is formulated for the programming languages (such as C++, C#, CUDA, etc.) and coupling electromagnetic scattering calculation functions (such as the bounce ray method and the vector transport method, etc.) used in the electromagnetic scattering simulation algorithms of different coupling scenarios, so as to integrate the electromagnetic scattering simulation functions of the above five different coupling scenarios on the same simulation platform.

[0029] The electromagnetic scattering simulation module (i.e., the fourth module) is used to perform electromagnetic scattering simulation tasks in a separate page in response to the selected coupled scenario.

[0030] Specifically, after the user selects the coupled scenario, the fourth module displays a simulation parameter list configuration interface, allowing the user to configure radar parameters, target / jamming parameters, and environmental element parameters. After the simulation parameters are configured, the system automatically models the background and target / jamming based on the configured simulation parameters and performs electromagnetic scattering calculations for the coupled scenario.

[0031] The system described above can simultaneously perform electromagnetic scattering analysis on up to five coupled scenarios in a visual manner on the same platform. Users can flexibly switch between the required simulation scenarios as needed without switching simulation platforms, which greatly improves ease of use. Different simulation scenarios do not require complicated operations, and the simulation efficiency of different coupled scenarios is greatly improved.

[0032] like Figure 2 As shown, when the user selects "Sea Surface and Ship Target Coupling," the fourth module displays a list of simulation parameters required for configuration in this coupling scenario on a separate page. This list includes radar parameters, target parameters, and sea surface parameters. Specifically, in the sea surface and ship target coupling scenario, the simulation parameters include radar parameters such as frequency band, frequency sampling rate, and polarization; target parameters such as target type, target coordinates, and azimuth and elevation angles relative to the radar; and sea surface parameters such as wind speed, wind direction, seawater salinity, and sea surface dimensioning accuracy. Once the simulation parameter list is configured and triggered by the user (e.g., clicking the "Start Calculation" button), the fourth module automatically performs electromagnetic scattering calculations for the sea surface and ship target coupling based on the configured simulation parameters and displays the simulated spectrum image of the electromagnetic scattering cross section (RCS) on the same page.

[0033] Under the function of "sea surface and ship target coupling", the fourth module simulates the three-dimensional linear sea surface geometry profile according to the wind speed and wind direction by using a linear filtering method. Furthermore, on the basis of the three-dimensional linear sea surface geometry modeling, the nonlinear and complex sea surface phenomena such as foam and white caps generated by wave breaking are considered. The semi-deterministic facet + vector radiation transfer (VRT) hybrid algorithm is used to calculate the multiple scattering effect of the white caps and foam particles generated by broken waves, while the occlusion and multiple scattering effects between facets are also considered. For the ordinary sea surface area where no wave breaking phenomenon occurs, the semi-deterministic facet method is used to calculate the electromagnetic scattering. For the sea surface and target composite area, the frequency domain shooting and bouncing rays (SBR) method is used to calculate the multiple scattering between the target facets. The SBR method is a high-frequency algorithm that combines geometrical optics (GO) and physical optics (PO). It uses GO to consider the energy propagation between targets and uses PO to integrate in the far field area. The SBR method is very suitable for electromagnetic scattering calculation of geometric targets with multiple reflections because it considers the multiple reflection problem between target facets. When the SBR method deviates from the mirror direction, the accuracy is not high, and at this time, the edge diffraction effect must be considered to improve the calculation accuracy.

[0034] Since the physical diffraction method (PTD) has the advantages of clear physical mechanism, simple calculation formula and perfect combination with SBR, the PTD method combined with the SBR method is selected to perform electromagnetic scattering calculation in order to improve the calculation accuracy of the algorithm. The embedded calculation function can not only calculate the coupling scattering echo, but also calculate the target or background alone.

[0035] In addition, the fourth module also provides a download function of analysis results. After completing the electromagnetic scattering calculation, the user can click the "open result" button to open the electromagnetic scattering calculation result file under the corresponding configuration coupling scene. The result file is saved in.txt format. As shown in Figure 3 , the opened result file schematic diagram contains two columns of numbers. The left column is the frequency (Hz), and the right column is the RCS (dBsm). For the simulation modules of the remaining coupling scenes, the calculation results can also be downloaded for viewing.

[0036] As shown in Figure 4As shown, when the user selects "sea surface and corner reflector coupling", the fourth module displays a list of required simulation parameters for configuration in the coupling scenario in a separate page for the user to configure, including sea surface parameters, corner reflector parameters, and radar parameters. The corner reflector parameters include attitude and position parameters of the corner reflector, etc. Specifically, the simulation parameters include radar parameters such as frequency band, frequency sampling rate, and polarization mode; corner reflector parameters include corner reflector size, corner reflector coordinate position, corner reflector azimuth angle relative to the radar, corner reflector pitch angle, and attitude angle of the corner reflector such as roll angle; and sea surface parameters include sea surface wind speed, sea surface wind direction, sea water salinity, and sea surface size profile accuracy. After the parameter configuration is completed, the user can click "Start calculation" to automatically calculate the electromagnetic scattering of the sea surface and the corner reflector coupling according to the configured simulation parameters, and display the calculated RCS spectrum image in the same page.

[0037] The sea surface corner reflector is mainly used as an RCS enhancer, a calibration body, or a target body. The present embodiment uses a icosahedron corner reflector for interference simulation calculation, which has the advantage of wide directional coverage. The present embodiment analyzes the coupling effect of the corner reflector and the sea surface by the PO combined time-domain SBR (TDSBR) method. When studying the time-domain characteristics, the dynamic model needs to be time-sliced, and the time-domain characteristics of the incident wave form are combined to obtain the time-domain variation results of the dynamic model by TDSBR calculation. Based on the time-domain scattering results of the model, the Doppler results of the corner reflector can be obtained through frequency domain analysis. The simulated echo signal can be used for interference effectiveness evaluation of the sea surface corner reflector.

[0038] As shown, Figure 5 As shown, when the user selects "sea surface and low-altitude chaff coupling", the fourth module displays a list of required simulation parameters for configuration in the coupling scenario in a separate page for the user to configure, including sea surface parameters, chaff parameters, and radar parameters. The chaff parameters include chaff bomb type parameters and state parameters, etc. Specifically, the simulation parameters include radar parameters such as frequency band, frequency sampling rate, and polarization mode; chaff parameters include total number of chaff filaments in the bomb, frequency band mixing type, chaff shape and distribution, etc.; and sea surface parameters include sea surface wind speed, sea surface wind direction, sea water salinity, and sea surface size profile accuracy. After the parameter configuration is completed, the user can click "Start calculation" to automatically calculate the electromagnetic scattering of the sea surface and the chaff coupling according to the configured simulation parameters, and display the calculated RCS spectrum image in the same page.

[0039] This embodiment divides the whole process of the foil strip bomb from launching to ascending, expanding, forming cloud, and scattering into three stages according to its interference mechanism and motion characteristics. In the modeling of the position transformation of the foil cloud, the method of detonating type throwing foil cloud is adopted. Firstly, the initial state of each foil strip is determined, including the initial spatial position, motion speed, acceleration of the foil strip, and the attitude of the foil strip. Secondly, the force state of the foil strip is determined. The force condition of each foil strip in the air is analyzed to determine the acceleration direction. Thirdly, the position and speed of each foil strip are updated according to the dynamics to finally determine the overall motion characteristics of the cloud group. However, due to the random distribution and large volume of the foil, it is extremely difficult to study its scattering characteristics, and the research on the composite scattering of the sea surface and the foil is even more rare. This embodiment adopts the vector transport theory (Vector Radiative Transfer, VRT) method, and according to the coupling scattering four-path method, the sea surface and the foil interference composite scattering characteristic modeling is carried out. The four paths refer to the four main scattering paths of the radar detection signal between the radar-foil cloud-sea surface. The vector transport theory method is a theory for calculating the propagation and scattering of electromagnetic waves in dense random media. Since the foil is very thin and can be compared with the medium particles, and the distribution and direction of the foil in the foil cloud group have a certain randomness. Therefore, the foil cloud group can be analogized as a random medium, and the vector transport theory and the numerical simulation algorithm-Monte Carlo method are used to solve the coupling scattering of the foil cloud and the sea surface. The interference echo signal of the foil-sea surface coupling scene is an important means for radar anti-jamming performance analysis, verification, and system test.

[0040] As Figure 6 shown, when the user selects "island shore and complex target coupling", the fourth module displays a list of simulation parameters required for configuration in the coupling scene in an independent page for the user to configure, including radar parameters and sea surface, island shore, and bare soil parameters. Specifically, the simulation parameters include radar parameters such as frequency band, frequency sampling rate, and polarization mode; target parameters include target model, target coordinate position, target azimuth angle relative to the radar, and elevation angle; sea surface parameters include sea surface wind speed, wind direction, sea water salinity, and sea surface size subdivision accuracy, etc. Ground bare soil parameters include temperature, soil moisture content, ground dielectric constant, and vegetation and sand beach dielectric constant. After the parameter configuration is completed, the user can click "Start calculation" to automatically calculate the electromagnetic scattering of the island shore and the complex target coupling according to the configured simulation parameters, and display the calculated RCS spectrum image in the same page.

[0041] Island shore complex target coupling scene is the most complex scene, which includes sea surface, beach, ground, and island terrain elevation information, so it is also the most demanding in computing among the five scenes. Island shore background contains sea surface in the nearshore area of land-sea junction, which needs to consider phenomena such as shoaling, refraction, diffraction, reflection and breaking of sea waves in the nearshore area, and also needs to consider different terrains such as sandy land, reefs, vegetation and the like. These complex and diverse background environments not only make environmental modeling challenging, but also have higher requirements for the applicability of coupling calculation. In this module, the sea surface model is created using the sea spectrum function, the ground model is obtained using the digital elevation model and interpolation processing, and finally the geometric model of the ship target is established using modeling software. Moreover, the sea surface, beach, island and ship model are integrated through Boolean operation to obtain the island shore model. For the vegetation-covered layer with arbitrary surface roughness and inclined slope, the cylindrical body is used to simulate the trunk and branches, and the ellipsoid is used to simulate the leaves, needles and stems, which to some extent satisfies the regularity of the hierarchical structure of the vegetation layer. When calculating the island shore and target composite field, the vegetation scattering calculation method based on SBR method and Monte Carlo technique is used for the vegetation-covered terrain, and the SBR method is used for the calculation of coupling scattering for other island shore terrains. The coupling scattering calculation of the sea surface is the same as that in the “sea surface and ship target coupling”, which will not be repeated here.

[0042] As shown in Figure 7 When the user selects “ground and armored target coupling”, the fourth module displays a list of simulation parameters required for configuration in the coupling scene in a separate page for the user to configure, including radar parameters and bare soil parameters. Specifically, the simulation parameters include radar parameters such as frequency band, frequency sampling rate, and polarization mode; target parameters include target model, target coordinate position, target relative to radar azimuth angle, pitch angle, etc.; ground bare soil parameters include temperature, soil moisture content, ground dielectric constant, etc. After the parameter configuration is completed, the user can click “Start calculation” to automatically calculate the electromagnetic scattering of the ground and armored target coupling according to the configured simulation parameters, and display the calculated RCS spectrum image in the same page.

[0043] In this coupling scene, first, the bare soil electrical parameters are determined according to the parameters of bare soil humidity, temperature, sand content, and pore volume ratio, the two-dimensional ground and target models are imported, and then the SBR method combined with the PTD method is used to calculate the electromagnetic scattering of the ground armored target coupling. The armored target coupling module can calculate the scattering echo of armored targets in various ground environments, and can be used to evaluate the stealth performance of ground stealth targets in different ground backgrounds.

[0044] For each coupled scenario, after configuring the simulation parameters, background modeling is performed based on these parameters. For example, a sea surface model is constructed based on the configured sea surface size and sea surface subdivision accuracy. After loading the background model, the target / interference model is loaded onto the background model according to the target / interference parameters. Target model files, such as those for a specific ship type, are built into the system and can be accessed by specifying the type and location using the configured target / interference parameters. The selection of target / interference parameters affects the deployment of the interference model. For example, the chaff state, shape, and number of chaff filaments in the chaff parameters affect the generation of the chaff interference model using hydrodynamic functions during chaff deployment. The angle of reflection in the angle reflection parameters affects the coupling relationship between the angle reflection model and the sea surface, and the size of the angle reflection affects the scattering intensity of the angle reflection model. After the target / interference model is loaded, the final step is to calculate the coupled electromagnetic scattering. This is the most crucial part of the system's functionality, and the electromagnetic scattering calculation methods used include the bouncing ray method, vector radiative transfer method, and hybrid methods.

[0045] In summary, the advantages and positive effects of the embodiments of this application are as follows: This application develops and integrates coupled electromagnetic scattering calculation techniques under five complex electromagnetic environments, filling the gap in coupled scattering analysis techniques for complex electromagnetic environments in multiple scenarios. Based on this, a simple and intuitive simulation system has been developed, allowing users to easily perform simulation calculations without complex configuration and visualize target / interference coupled echoes under five scenarios. This is of great significance for the analysis of target coupled scattering mechanisms under complex electromagnetic environments and the evaluation of interference and anti-interference effectiveness in informationized battlefields.

[0046] In another aspect of this application, a method for simulating electromagnetic scattering coupled between the sea surface and chaff is provided, such as... Figure 8 As shown, it includes: S1. Set simulation parameters such as radar parameters, chaff parameters, and sea surface parameters.

[0047] The details of the simulation parameters set can be found in the previous examples, and will not be repeated here.

[0048] S2. Establish a sea surface model based on sea surface parameters, load a chaff interference model into the sea surface model based on chaff parameters, and perform electromagnetic scattering calculations based on radar parameters.

[0049] The construction of the sea surface model and the chaff interference model has been described in the previous embodiments. The construction of the chaff interference model is divided into three stages: First, the initial state of each chaff is determined, including its initial spatial position, velocity, acceleration, and attitude. Second, the force state of the chaff is determined. The forces acting on each chaff in the air are analyzed to determine the direction of acceleration. Finally, the position and velocity of each chaff are updated based on dynamics, ultimately determining the overall motion characteristics of the chaff cloud (i.e., the chaff interference model).

[0050] As an optional implementation, a method for loading a chaff interference model into a sea surface model based on chaff parameters includes: S21. Based on the foil parameters, establish a foil interference model containing a large number of foils, including the force model, position model, velocity model, orientation model, and angular velocity model of each foil.

[0051] First, we analyze the motion equations of a single foil strip.

[0052] Translation and rotation are the two states that the foil exhibits during motion. Assuming the rotational angular velocity is... For The following are examples of foil strips that rotate at a constant speed: (1) Assuming attitude For the initial state of scattering the foil strips, then for In terms of time, the formula for its attitude change is: (2) The expression for the resistance experienced by the foil strip in the translational state is: (3) Among them, the foil strip axial direction along distributed, The length to be taken for the foil strip. Indicates the diameter of the foil cross-section and the atmospheric gas velocity. direction and The included angle between the axes is 90°, and The angle between the intersecting axes is Furthermore, this direction determines the direction of the force on the foil, C D Indicates the drag coefficient. This represents atmospheric density. The atmospheric drag experienced by the foil is decomposed into its velocity relative to the atmosphere based on the principles of mechanical analysis. The force consists of two components in two directions, namely, the parallel and perpendicular components, where the perpendicular component is... The component can decelerate the foil strip, and its expression is: (4) Horizontal The component's function is to allow the foil strip to move laterally; the corresponding expression is: (5) In the above formula, the angle of attack of the foil strip is... The drag coefficient at that time can be used The lift coefficient is expressed as... express.

[0053] In addition to the effects of atmospheric forces on a single strip of foil, consider Earth's gravity. The effect of the foil strip is expressed as follows: (6) In the formula, m represents the mass of a single foil strip, M represents the mass of the Earth, and μ represents the gravitational constant. (x, y) represents the x and y coordinates of the foil in a cylindrical coordinate system centered at the foil's center. The lateral coordinates of the foil in the cylindrical coordinate system are... , Where z is the z-axis coordinate value, and the coordinates of the upper and lower bottom surfaces of the foil are respectively... Atmospheric forces and Earth's gravity work together to accelerate the chaff, resulting in a force model of the chaff.

[0054] Since each chaff in a chaff cloud exists with different speeds, positions, attitudes, and angular velocities, when analyzing the diffusion characteristics of a chaff cloud, it is necessary to analyze its characteristic distribution as a whole. The normal distribution is a good description of the chaff cloud in its initial state.

[0055] The initial position of the foil strip follows a normal distribution, that is, the position model is expressed as: (7) in, , ,and Indicates that the foil strips are respectively in , , The probability distribution of positions on the coordinate system. , and These respectively represent the foil strips in , , Standard deviation of coordinate distribution in direction , , These represent the times at which the foil dispenser is deployed. , , Position in direction Represents pi (π). These represent the possible coordinates of the chaff at the moment of deployment. , , The component in direction. The initial velocity of the foil follows a normal distribution, that is, the velocity model is expressed as: (8) in, , ,and Indicates that the foil strips are respectively in , , The probability distribution of velocities in a given direction. , and These respectively represent the foil strips in , , Standard deviation of velocity distribution in the direction , and These represent the timing of the chaff dispenser's application. , , velocity in the direction, These represent the possible chaff velocity components in the x, y, and z directions at the moment of deployment. The initial orientation of the chaff. Obeys a uniform spherical distribution. This indicates the angle between the axial direction of the foil strip and the z-axis. Let x represent the angle between the projection of the foil strip onto the horizontal plane and the x-axis, then the orientation model of the foil strip is... Represented as: (9) angular velocity of the foil strip It follows a normal distribution, i.e., the angular velocity model. Represented as: (10) in, This represents the variance of the normal distribution of angular velocity.

[0056] S22. Based on the force model, position model, velocity model, orientation model and angular velocity model of each foil strip, establish the center of mass motion model of the foil strip interference model.

[0057] When chaff is actually deployed, the space contains atmospheric molecules. The atmospheric environment at the deployment location is a significant factor influencing the diffusion of the chaff cloud. Analyzing the forces acting on the chaff, for a single chaff strip within the cloud, we have: (11) (12) In the above formula, and The first The drag and lift force experienced by the first foil strip, the first The speed of the root foil strip is The atmospheric density value at the location of the foil strip is The angle between the axial direction of the foil strip and the direction of the airflow velocity is , Indicates the drag coefficient. This represents the lift coefficient.

[0058] Ignoring the differences in the speed of individual foil strips within the cloud, we use the overall speed of the cloud. In substitutions (11) and (12) Furthermore, it is assumed that the atmospheric density is very uniform across the entire cloud cluster. In substitutions (11) and (12) Using the axial direction of a single foil strip and the velocity of the cloud cluster. Angle of direction In the substitution formulas (11) and (12) We can obtain: (13) (14) If the chaff strips in a cloud have the same physical characteristics, then they have the same mass. The coordinates of the center of mass of the entire chaff cloud can be calculated using a system of particles: (15) In the above formula, The first in the cloud The spatial position vector of the root chaff, the number of chaff in the cloud is represented by... express.

[0059] The force acting on the center of mass of the cloud is: (16) In the above formula, For the first The vector of atmospheric forces acting on the chaff strip. The attitude information of the chaff strip and its pitch angle. and azimuth related, yes The function. Equation (16) is extended to: (17) In the above formula, satisfy , is the weighting function for the chaff attitude information. .

[0060] Based on the fact that the foil strip's orientation follows a uniform spherical distribution and the force analysis of a single foil strip, the symmetry equation (17) can be expressed as: (18) In the above formula, Indicates the orientation angle. The direction is opposite to the direction of the cloud's absolute velocity. Let be the air resistance coefficient of the cloud's center of mass. When uniformly distributed, the attitude distribution of the foil strips is as follows: Then we have: (19) The motion equation of the foil cloud center can be expressed as: (20) In the above equation, is the mass of a single foil, is the universal gravitation vector, represents the second derivative of the position vector, i.e., the acceleration vector of the foil center. The operation represents taking the vector modulus.

[0061] S23, based on the center-of-mass motion model, a diffusion motion model of the foil jamming model position with time is established.

[0062] The foil cloud center coordinate system is shown in Figure 9 . Referring to Figure 9 , the displacement of the foil in the , and directions is respectively: (21) Where: (22) (23) (24) respectively represent functions with respect to time , T represents the total diffusion time, and t represents the time variable after integration. Thus, the diffusion motion of the foil cloud position with time is given.

[0063] As an optional implementation, as shown in Figure 10 , the method for calculating the electromagnetic scattering intensity of the foil jamming model under the action of the detection signal emitted by the radar using the vector transport theory method includes: 1) Generate a detection signal incident source plane, and uniformly sample the incident source plane.

[0064] 2) Partition the foil jamming model, and calculate the outer envelope of the foil jamming model and the outer envelope of each partition. The foil jamming model is partitioned into multiple scattering units.

[0065] 3) Calculate the attenuation coefficient of each partition respectively.

[0066] The feature design of the above steps 1) - 3) can correspond to the prior art documents introduced in the background art. Or when there are still the same operation steps in the following, reference can be made to the documents.

[0067] 4) A beam of probe signals is emitted to determine whether the set maximum number of analog probe signal beams is reached, and if so, the process is ended, otherwise the next step is performed.

[0068] 5) It is determined whether the probe signal collides with the foil interference model, and if so, the next step is performed, otherwise it returns to step 4).

[0069] 6) The energy of the probe signal after collision with the foil interference model is collected, and the scattering direction of the probe signal after collision is extracted.

[0070] 7) The collision free path of the probe signal is extracted to determine the next collision point; it is determined whether the probe signal escapes from the foil interference model or the energy of the probe signal is lower than the threshold, and if so, it returns to step 4) to simulate the next beam of probe signals, otherwise it returns to step 6) to continue collision with the foil interference model.

[0071] 8) After all the probe signals are simulated, the vector transport equation of the foil interference model is constructed according to the collected energy, and the Stokes vector is extracted from the vector transport equation to obtain the electromagnetic scattering intensity.

[0072] For a scattering unit, it is assumed that the probe signal incident on it is: (25) wherein, is the initial emitted V-polarized electric field intensity, is the initial emitted V-polarized magnetic field intensity. is the imaginary unit, is the wave number vector of the emitted electromagnetic wave, and the direction is the same as the direction of electromagnetic wave propagation. is the position vector of the scattering unit. is the horizontal polarization unit vector, is the vertical polarization unit vector. Therefore, the relationship between the incident field and the scattered field can be represented by the scattering matrix, that is: (26) The formula represents the relationship between the electric field incident field intensity and the electric field scattering field intensity, wherein is the vertical component of the scattering field, is the horizontal component of the scattering field, is the vertical component of the incident field, is the horizontal component of the incident field, is the scattering amplitude function ( ).

[0073] The calculation of RCS requires the calculation of the scattered field intensity, or the radiance of the scattered wave. Radiance refers to the energy per unit area per unit solid angle The unit power can be written as: (27) where, is the scattered intensity, is the power flow direction, is the and the angle between the surface element normal.

[0074] The radiance can be obtained by integrating the unit power over the radiating area.

[0075] In addition, in order to consider the polarization of electromagnetic waves and perfectly describe the polarization characteristics of electromagnetic radiance, four Stokes parameters are introduced, which are: (28) (29) (30) (31) where represents the electric field of V polarization, represents the electric field of H polarization. represents the wave impedance in free space. The superscript represents the conjugate operation on the complex number. and represent the real and imaginary operations on the complex number, respectively. For a complete elliptical polarized wave, the relationship between the four parameters is: (32) Suppose that n particles (i.e. probe signals) are randomly distributed in a cylindrical element with length ds and volume dv, and an electromagnetic wave with radiance I passes through the element. According to the law of conservation of energy, the change in the radiance of the electromagnetic wave is: (33) where, is the incident intensity, is the scattered intensity, is the space other radiation source, is the transition coefficient or matrix between the incident intensity and the scattered intensity. The first term on the right side of the above equation refers to the absorption , scattering , background absorption ​The consumed energy, the second term represents the energy provided by other radiation sources in space, and the third term represents the coupling scattering between scatterers in the total scattering intensity.

[0076] The above equation is applied to the foil cloud electromagnetic scattering characteristics analysis, the vector transport equation of the foil cloud group is as follows: (34) Wherein, , is the extinction coefficient, is the other radiation sources in space, is the coefficient matrix used to represent the relationship between the incident intensity and the scattering intensity , denoted as the phase matrix.

[0077] In the vector transport equation, the electromagnetic scattering intensity is represented by the Stokes vector, which is composed of four modified Stokes parameters I, Q, U, V. The numerical simulation algorithm-Monte Carlo method is used to solve the vector transport equation, which needs to sample and calculate each process. Here, a beam of probe signals (abstracted as photons) is set to irradiate a large-scale foil cloud group on the sea surface, and the intersection judgment is made to determine whether the photon collides with the foil cloud or the sea surface. The collision judgment satisfies the four path definitions, including (1) direct path: the probe signal emitted by the radar directly acts on the foil interference model and returns to the radar; (2) sea surface reflection path: the probe signal emitted by the radar is reflected by the sea surface and then acts on the foil interference model and returns to the radar; (3) foil cloud-sea surface path: the probe signal emitted by the radar acts on the foil interference model and is reflected to the sea surface, and then the sea surface reflects it back to the radar; (4) multiple reflection path: the probe signal emitted by the radar is reflected multiple times between the foil interference model and the sea surface, and then reflected back to the radar. If any of the path rules is met, it means that a collision occurs. If the probe signal collides with the foil cloud, when the photon enters the sphere from the sphere, it will collide with a foil with a random orientation in a free path distance, and be scattered to a random direction with a certain probability, and the next collision will be carried out in the free path along this direction. In this way, the beam energy is consumed by the collision process or scattered out of the range of the foil cloud group; if it intersects with the sea surface, it is processed according to the principle of medium surface electromagnetic wave reflection. The intersection judgment is processed throughout the entire motion process of the photon, until it is collected or the energy is almost exhausted without any intersection with the cloud group and the sea surface. The solution flowchart is shown in Figure 10 .

[0078] On the basis of the existing foil interference model (cloud group spatial distribution and foil orientation data file), the process of calculating the electromagnetic scattering field intensity by the vector transport equation is as follows Figure 10As shown. Based on this, the Monte Carlo method is used to solve the vector transport equation to obtain the RCS information of the chaff interference model, and its electromagnetic scattering characteristics are obtained.

[0079] In some specific implementations, the process of calculating the electromagnetic scattering cross section of the chaff interference model using a vector transport method combined with the Monte Carlo method includes: Step 1: Simulate the initial direction and position of the incident "photon" (i.e., single-beam detection signal) on the spherical surface of the foil cloud.

[0080] Observation coordinate system The origin of the coordinate system is established at the center of the spherical foil cloud. For parallel light, the initial direction is determined. Let's assume a "photon"... From the direction angle The direction of the light is irradiated onto the spherical surface of a foil cloud with radius A; sampling of the radius of the circle containing the "photon". , for Uniformly distributed random numbers (the same applies below). The location of the "photon" and... Angle between axes The coordinates of the "photon" at this moment are: .

[0081] Step 2: Sampling of foil orientation angles. The orientation angles of the foil strips are sampled according to a uniform probability density. ,in .

[0082] Step 3: Sampling the "photon" scattering path. When the density of the chaff cloud is uniformly distributed, its free path follows an exponential probability distribution and is related to the density of the chaff cloud. Therefore, the collision distance of the "photon" between the chaff is... (i.e., free path) sampling is , Let be the average attenuation cross section, where The value represents the density of the chaff cloud, and the angle brackets represent the geometric mean of the chaff orientation. express Forward scattering amplitude under polarization conditions This represents the forward scattering amplitude under HH polarization conditions. and These represent the incident intensities of the photon, which are vertically and horizontally polarized, respectively. Wavenumber represents free space.

[0083] Step 4: Sampling the scattering direction of "photons". Let the maximum field strength obtained under all incident and scattering angles be... Extract the comparison field strength Simultaneously, a scattering angle conforming to the uniform distribution characteristics is extracted from the entire space. , The sampled scattering angle , the sampled foil orientation angle and the incident angle of the last scattering are substituted into the phase matrix to calculate the phase matrix and the magnitude of the scattering field strength, and compare it with the sampled contrast field strength to complete the verification: if , where , , , it means that the verification is passed, the sampled scattering angle is adopted, if not, re-sample and calculate until the above verification condition is met.

[0084] Step five: tracking of the photon position. According to the sampled free path and the scattering angle , the position reached by the "photon" after this scattering is calculated, that is: (35) Step six: test of the "photon" emission from the foil cloud or absorption. Calculate the distance between the position of the "photon" and the center of the foil cloud, if the distance d is greater than the radius A of the cloud, it means that the "photon" is scattered out of the cloud, and its emission direction and intensity are recorded; if the distance d is less than the radius A of the cloud, it means that the "photon" is still in the foil cloud after scattering. According to the incident intensity and the phase matrix, the scattering field strength of the "photon" is calculated (the subscript represents the incident, and the subscript represents the scattering. The phase matrix contains the conversion matrix of the local coordinate system and the observation coordinate system polarization conversion, which is constructed based on the incident angle of the detection signal, the extracted foil orientation angle and the sampled scattering angle of the detection signal, and the calculation method is given in the foregoing) is attenuated times, where is the extinction coefficient. At this time, the scattering intensity of the "photon" is detected. If the "photon" intensity is less than the lower limit (i.e. the set threshold), the "photon" is eliminated, and step one and the following steps are re-performed; if the "photon" intensity is greater than the lower limit , the next scattering is prepared.

[0085] Step seven: convert the scattering angle into the incident angle of the next "photon" incident, and re-perform step two and the following steps until the "photon" is scattered out of the foil cloud or consumed in the foil cloud.

[0086] Step eight: Repeat step one and the steps below until the simulation is complete for the total number of "photons" of the probe signal.

[0087] Step nine: Calculate the electromagnetic scattering cross section for all exit directions, subscript denotes incidence, denotes scattering, subscript and denote polarization conditions. The scattering cross section expression is: (36) The electromagnetic scattering of the foil cloud at a static time point is quickly calculated using the vector radiation transfer theory, and the dynamic scattering simulation is realized by splicing the dynamic diffusion scattering characteristics of the foil cloud based on the time slicing simulation idea.

[0088] According to the idea of the application, the embodiment of the application further provides a sea surface and foil coupled electromagnetic scattering simulation device, which comprises: A first module is configured to set radar parameters, foil parameters and sea surface parameters. A second module is configured to establish a sea surface model according to the sea surface parameters, load a foil interference model in the sea surface model according to the foil parameters, and perform electromagnetic scattering calculation according to the radar parameters. The second module performs electromagnetic scattering calculation according to the following configuration: The electromagnetic scattering intensity of the foil interference model under the action of the probe signal is calculated by using the vector transport theory method; the probe signal is simulated according to the radar parameters; Based on the electromagnetic scattering intensity, the electromagnetic scattering cross section of the foil interference model is calculated by using the Monte Carlo method.

[0089] The data specifically configured by each module in the device can be referred to the features designed for each step in the foregoing method embodiment.

[0090] In addition, the embodiment of the application further provides a sea surface and foil coupled electromagnetic scattering simulation device, comprising a processor and a storage medium, the storage medium stores computer instructions, and the processor runs the computer instructions, and can execute the above-mentioned sea surface and foil coupled electromagnetic scattering simulation method.

[0091] The present application is not limited to the foregoing specific embodiments. The present application extends to any new feature or any new combination disclosed in the specification, as well as any new method or process step or any new combination disclosed.

Claims

1. A simulation method for electromagnetic scattering coupled between sea surface and foil, characterized in that, include: Set radar parameters, chaff parameters, and sea surface parameters; A sea surface model is established based on the sea surface parameters, a chaff interference model is loaded into the sea surface model based on the chaff parameters, and electromagnetic scattering calculations are performed based on the radar parameters. The methods for performing electromagnetic scattering calculations include: The electromagnetic scattering intensity of the chaff interference model under the action of the detection signal is calculated using vector transport theory; the detection signal is obtained by simulation based on the radar parameters. Based on the electromagnetic scattering intensity, the electromagnetic scattering cross section of the foil interference model is calculated using the Monte Carlo method.

2. The electromagnetic scattering simulation method coupled with chaff on the sea surface as described in claim 1, characterized in that, The calculation of the electromagnetic scattering intensity of the chaff interference model under the action of the detection signal using vector transport theory includes: 1) Generate a detection signal incident source plane and uniformly sample the incident source plane; 2) Divide the foil interference model into partitions, and calculate the outer envelope of the foil interference model and the outer envelope of each partition; 3) Calculate the attenuation coefficient for each zone; 4) Emits a probe signal and determines whether the maximum number of simulated probe signal beams has been reached. If yes, the process ends; otherwise, proceed to the next step. 5) Determine if the detection signal collides with the chaff interference model. If yes, proceed to the next step; otherwise, return to step 4. 6) Collect the energy after the detection signal collides with the chaff interference model, and extract the scattering direction of the detection signal after the collision; 7) Extract the free path of the detection signal collision to determine the next collision point; determine whether the detection signal escapes the foil interference model, or whether the energy of the detection signal is lower than the threshold. If so, return to step 4) to simulate the next beam of detection signal; otherwise, return to step 6) to continue colliding with the foil interference model. 8) After all the detection signals have been simulated, construct the vector transport equation of the chaff interference model based on the collected energy, and extract the Stokes vector from the vector transport equation to obtain the electromagnetic scattering intensity.

3. The electromagnetic scattering simulation method coupled with chaff on the sea surface as described in claim 2, characterized in that, The determination of whether the detection signal collides with the foil interference model includes: Determine if the following path rules are met: The detection signal emitted by the radar directly acts on the chaff jamming model and then returns to the radar; Alternatively, the radar's detection signal is transmitted from the sea surface, acts on the chaff jamming model, and then returns to the radar; Alternatively, the radar's detection signal may act on the chaff jamming model, be reflected to the sea surface, and then be reflected back to the radar. Alternatively, the radar's detection signal may be reflected multiple times between the chaff jamming model and the sea surface before being reflected back to the radar. If any path rule is satisfied, it indicates that a collision has occurred.

4. The electromagnetic scattering simulation method coupled with chaff on the sea surface as described in claim 2, characterized in that, The process of collecting the energy after the detection signal collides with the chaff interference model and extracting the scattering direction of the detection signal after the collision includes: The initial direction and position of the probe signal were simulated on the surface of the foil interference model; Sampling was performed on the foil orientation angle; The scattering path of the probe signal is sampled to obtain the sampled collision free path; The scattering angle of the detected signal is sampled, the scattered field strength at that scattering angle is calculated, and it is compared with the sampled comparison field strength for verification. If the verification is successful, the sampled scattering angle and scattering field strength are adopted; otherwise, the sampling is repeated until the verification is successful.

5. The electromagnetic scattering simulation method coupled with chaff on the sea surface as described in claim 4, characterized in that, Determining whether the detection signal escapes the foil interference model includes: Based on the sampled collision free path and the sampled scattering angle, calculate the position reached by the detection signal after collision scattering; Calculate the distance between the detection signal at this location and the center of the chaff interference model sphere; If the calculated distance exceeds the radius of the chaff interference model, it indicates that the detection signal has escaped the chaff interference model.

6. The electromagnetic scattering simulation method coupled with chaff on the sea surface as described in claim 4, characterized in that, Determining whether the energy of the detected signal is below a threshold includes: The scattered field strength of the detection signal is calculated based on the incident intensity and phase matrix of the detection signal; the phase matrix is ​​constructed based on the incident angle of the detection signal, the orientation angle of the sampled foil strip, and the scattering angle of the sampled detection signal; wherein, the incident angle of the detection signal is the initial azimuth angle of the detection signal or the scattering angle after the previous collision. The intensity of the scattered field of the detected signal is compared with the threshold value to determine whether it is below the threshold.

7. The electromagnetic scattering simulation method coupled with chaff as described in claim 1, characterized in that, Based on the chaff parameters, a chaff interference model is loaded into the sea surface model, including: Based on the foil parameters, a foil interference model containing a large number of foils is established, including the force model, position model, velocity model, orientation model, and angular velocity model of each foil. Based on the force model, position model, velocity model, orientation model and angular velocity model of each foil strip, a center of mass motion model of the foil strip interference model is established. Based on the centroid motion model, a diffusion motion model of the foil interference model position over time is established.

8. A simulation device for electromagnetic scattering coupled between sea surface and foil strips, characterized in that, include: The first module is used to set radar parameters, chaff parameters, and sea surface parameters; The second module is used to establish a sea surface model based on the sea surface parameters, load a chaff interference model into the sea surface model based on the chaff parameters, and perform electromagnetic scattering calculations based on the radar parameters. The second module performs electromagnetic scattering calculations according to the following configuration: The electromagnetic scattering intensity of the chaff interference model under the action of the detection signal is calculated using vector transport theory; the detection signal is obtained by simulation based on the radar parameters. Based on the electromagnetic scattering intensity, the electromagnetic scattering cross section of the foil interference model is calculated using the Monte Carlo method.

9. A simulation device for electromagnetic scattering coupled between sea surface and foil, comprising a processor and a storage medium, wherein the storage medium stores computer instructions, characterized in that, When the processor executes the computer instructions, it can perform the electromagnetic scattering simulation method of sea surface and foil as described in any one of claims 1-7.

10. A complex environment electromagnetic scattering simulation system, characterized in that, include: The third module is used to display the coupling scenarios to be selected, including sea surface and ship target coupling, sea surface and corner anti-jamming coupling, sea surface and low-altitude chaff coupling, island and shore and complex target coupling, and ground and armored target coupling. The fourth module is used to perform an electromagnetic scattering simulation task in a separate page in response to the selected coupling scenario; wherein, when the selected coupling scenario is sea surface and low-altitude chaff coupling, the fourth module executes the sea surface and chaff coupling electromagnetic scattering simulation method as described in any one of claims 1-7.

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