A foil modeling method, system, device, medium and product

Abstract

The present application discloses a chaff modeling method, system, device, medium and product, and relates to the field of simulation modeling. The method comprises: modeling the RCS of a single chaff under polarization conditions and constructing a single chaff RCS model; setting a chaff cloud as a spherical chaff cloud, splitting the spherical chaff cloud into cubic units according to a finite element method, and constructing a chaff cloud RCS model based on the single chaff RCS model; determining unit echo signals of chaff units that can generate echoes based on the chaff cloud RCS model; determining an overall echo signal of the chaff cloud based on all unit echo signals; the overall echo signal is used to characterize the overall scattering characteristics of chaff interference. The finite element method of the present application unitizes the chaff cloud, and obtains the echo signal of the chaff interference through coupling calculation to characterize the overall scattering characteristics of the chaff interference, thereby meeting the needs of engagement-level simulation.

Description

Technical Field

[0001] The present application relates to the field of simulation modeling, and in particular to a foil strip modeling method, system, equipment, medium and product. Background Art

[0002] Simulation based on the functional level (also known as platform level) model is a digital model that has acceptable consistent behavior with the simulated system in terms of functional structure and working principle after reasonable abstraction based on the model mechanism within the problem domain and level of concern. When large sample simulation is required for analysis, the use of functional level simulation models can achieve fast simulation calculations and conduct more in-depth research on equipment performance and related problem mechanisms.

[0003] Passive chaff jamming is an important means of active defense for surface ships, of which the main means used are diluted chaff jamming and centroid chaff jamming. Diluted chaff jamming is a self-defense deceptive jamming, which is generally launched at a relatively long distance from the incoming target. When the terminal guidance radar is turned on to search for the target, it is possible to capture the chaff cloud false target, reducing the probability of capturing the real target ship. Centroid chaff jamming is a self-defense deceptive jamming in the final stage. When the radar tracks the ship, the centroid chaff jamming can form a chaff cloud at a certain distance from the ship target, so that the jammer and the target are in the same resolution unit of the radar, so that the radar seeker tracks the centroid of the mixed real and false targets, increasing the relative lateral distance, thereby reducing the probability of hitting the ship.

[0004] Flake interference is the sum of echoes generated by a large number of foil strips randomly distributed in space. It is a distributed target. How to calculate the overall scattering characteristics of foil strip interference is still a difficult problem in the industry. Summary of the invention

[0005] The purpose of this application is to provide a chaff modeling method, system, equipment, medium and product, which unitizes the chaff cloud by the finite element method, and obtains the echo signal of the chaff interference by coupling calculation to characterize the overall scattering characteristics of the chaff interference, thereby meeting the needs of engagement-level simulation.

[0006] To achieve the above objectives, this application provides the following solutions.

[0007] In a first aspect, the present application provides a foil strip modeling method, comprising the following steps.

[0008] The RCS of a single foil strip under polarization conditions is modeled and a single foil strip RCS model is constructed.

[0009] The foil strip cloud is set as a spherical foil strip cloud, and the spherical foil strip cloud is split into cubic units according to the finite element method. Based on the single foil strip RCS model, a foil strip cloud RCS model is constructed.

[0010] Based on the foil cloud RCS model, the unit echo signal of the foil unit that can generate an echo is determined.

[0011] The overall echo signal of the foil cloud is determined based on all unit echo signals; the overall echo signal is used to characterize the overall scattering characteristics of the foil interference.

[0012] Optionally, the RCS of a single foil strip under polarization conditions is modeled to construct a single foil strip RCS model, which specifically includes the following steps.

[0013] A spatial coordinate system is suggested with the center of a single foil strip as the origin, the horizontal plane as the XOY plane, the east direction as the Y axis, and the vertical upward direction as the Z axis. Based on the spatial coordinate system, a polarization coordinate system is suggested. The polarization coordinate system is established with the center of the dipole as the origin, the electric field incident direction as the Z axis, the horizontal polarization direction as the X axis, and the vertical polarization direction as the Y axis.

[0014] Based on the polarization coordinate system and according to the spatial geometric relationship, the relationship between the scattered electric field and the incident electric field is determined.

[0015] According to radar polarization theory, the polarization scattering matrix of the dipole of a single foil strip is determined based on the relationship between the scattered electric field and the incident electric field.

[0016] The average Mueller matrix of a single foil strip is solved based on the polarization scattering matrix of the dipole.

[0017] A single foil strip RCS model is constructed according to the average Mueller matrix; the single foil strip RCS model is used to calculate the average RCS of the single foil strip under polarization mode.

[0018] Optionally, the single chaff RCS model for: .

[0019] in, E in is the electric field of the incident wave; J r is the normalized Stokes vector of the receive polarization; J t is the normalized Stokes vector of transmit polarization; is the average Mueller matrix of a single foil strip; r is the distance from the dipole center to the field point.

[0020] Optionally, the foil strip cloud is set to a spherical foil strip cloud, the spherical foil strip cloud is split into cubic units according to the finite element method, and a foil strip cloud RCS model is constructed based on the single foil strip RCS model, which specifically includes the following steps.

[0021] The plane electromagnetic wave energy incident on the foil strip cloud is divided into two parts of plane electromagnetic wave energy; one part of the plane electromagnetic wave energy is scattered in the direction opposite to the incident direction, and the other part of the plane electromagnetic wave energy continues to propagate forward along the incident direction and passes through the foil strip cloud.

[0022] The calculation method of determining the area of ​​the foil cloud ball is based on the divided two parts of plane electromagnetic wave energy.

[0023] The spherical foil strip cloud is split into cubic units according to the finite element method to determine the foil strip units.

[0024] Based on the single foil strip RCS model, the RCS of the foil strip unit is determined.

[0025] Based on the calculation method of the chaff cloud ball area and according to the RCS of the chaff unit, a chaff cloud RCS model is constructed; the chaff cloud RCS model is used to characterize the maximum radar scattering cross-section of the chaff cloud.

[0026] Optionally, the maximum radar cross-sectional area of ​​the chaff cloud S max for:

[0027] Where R is the radius of the chaff cloud; is the effective foil density; is the average effective RCS of a single chaff strip; It is the total effective number of chaff strips after correction.

[0028] Optionally, based on the foil cloud RCS model, determining a unit echo signal of a foil unit capable of generating an echo specifically includes the following steps.

[0029] Based on the RCS model of the chaff cloud, the Doppler frequency shift generated when the chaff cloud moves horizontally is determined.

[0030] The Doppler frequency shift caused by the speed fluctuation of each foil strip unit is determined according to the Doppler frequency shift generated when the foil strip cloud moves horizontally.

[0031] The Doppler frequency shift of each foil strip unit is determined according to the Doppler frequency shift generated when the foil strip cloud moves horizontally and the Doppler frequency shift caused by the speed fluctuation of each foil strip unit.

[0032] The unit echo signal of the foil strip unit capable of generating an echo is determined according to the Doppler frequency shift of each foil strip unit.

[0033] In a second aspect, the present application provides a foil strip modeling system, comprising the following modules.

[0034] The single foil strip RCS model building module is used to model the RCS of a single foil strip under polarization conditions and build a single foil strip RCS model.

[0035] The foil cloud RCS model building module is used to set the foil cloud as a spherical foil cloud, split the spherical foil cloud into cubic units according to the finite element method, and build a foil cloud RCS model based on the single foil RCS model.

[0036] The unit echo signal determination module is used to determine the unit echo signal of the foil strip unit that can generate an echo based on the foil strip cloud RCS model.

[0037] The overall echo signal determination module is used to determine the overall echo signal of the foil strip cloud according to all unit echo signals; the overall echo signal is used to characterize the overall scattering characteristics of the foil strip interference.

[0038] In a third aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of any one of the foil strip modeling methods described above.

[0039] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the above-described foil strip modeling methods.

[0040] In a fifth aspect, the present application provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of any one of the foil strip modeling methods described above.

[0041] According to the specific embodiments provided by the present application, the present application discloses the following technical effects: the present application models the radar cross section (RCS) of a single foil strip, splits the foil strip cloud through the finite element method, models the RCS of the foil strip cloud, and splits the entire foil strip cloud into multiple foil strip units, thereby determining the unit echo signal of the foil strip unit that generates the echo, and then obtaining the overall echo signal of the foil strip cloud, so as to accurately determine the overall scattering characteristics of the foil strip interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 The figure is a flow chart of a foil strip modeling method in one embodiment of the present application.

[0044] Figure 2 A schematic diagram of dipole scattering in a spatial coordinate system provided in an embodiment of the present application.

[0045] Figure 3 A schematic diagram of dipole scattering in a polarization coordinate system provided in an embodiment of the present application.

[0046] Figure 4 An electromagnetic scattering diagram of a spherical foil cloud provided in accordance with an embodiment of the present application.

[0047] Figure 5 A flowchart of foil cloud echo modeling provided in one embodiment of the present application.

[0048] Figure 6 A schematic diagram of the division of foil cloud units provided in one embodiment of the present application. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0051] like Figure 1 As shown, an embodiment of the present application provides a foil strip modeling method, comprising the following steps.

[0052] Step 101: Model the RCS of a single foil strip under polarization conditions and construct a single foil strip RCS model.

[0053] Step 102: setting the foil strip cloud to a spherical foil strip cloud, splitting the spherical foil strip cloud into cubic units according to the finite element method, and constructing a foil strip cloud RCS model based on the single foil strip RCS model.

[0054] Step 103: Based on the foil cloud RCS model, determine the unit echo signal of the foil unit that can generate an echo.

[0055] Step 104: determining the overall echo signal of the foil cloud according to all unit echo signals; the overall echo signal is used to characterize the overall scattering characteristics of the foil interference.

[0056] In an exemplary embodiment of the present application, step 101 is replaced by the following steps 201 to 205.

[0057] Step 201: A spatial coordinate system is suggested with the center of a single foil strip as the origin, the horizontal plane as the XOY plane, the east direction as the Y axis, and the vertical upward direction as the Z axis, and based on the spatial coordinate system, a polarization coordinate system is suggested; the polarization coordinate system is established with the center of the dipole as the origin, the electric field incident direction as the Z axis, the horizontal polarization direction as the X axis, and the vertical polarization direction as the Y axis.

[0058] Step 202: Based on the polarization coordinate system and according to the spatial geometric relationship, determine the relationship between the scattered electric field and the incident electric field.

[0059] Step 203: According to radar polarization theory, based on the relationship between the scattered electric field and the incident electric field, a polarization scattering matrix of the dipole of a single foil strip is determined.

[0060] Step 204: Solve the average Mueller matrix of a single foil strip based on the polarization scattering matrix of the dipole.

[0061] Step 205: constructing a single foil strip RCS model according to the average Mueller matrix; the single foil strip RCS model is used to calculate the average RCS of the single foil strip under polarization mode.

[0062] In practical applications, RCS is a measure of the returned or scattered power in a given direction. If the foil strips are in any position in space and are equally distributed, the average radar cross-section of the foil strips should be the radar cross-section. Average over the entire solid angle of space, that is

[0063] .

[0064] in, is the solid angle, which obeys the equal probability distribution, that is, , according to the spherical coordinate system, taking the radius as 1, then , The orientation vector of a single foil strip is The angle with the positive Z axis.

[0065] After points are accumulated , is the maximum value of the half-wavelength foil radar cross section, , is the wavelength. So we get the average radar cross-section of a single foil strip. Since foil strips are not ideal conductors, in practical applications, .

[0066] The above analysis is based on the fact that the polarization mode of the foil strip is not taken into consideration. Since the polarization mode has a great influence on the RCS of the foil strip cloud, the RCS of a single foil strip under polarization conditions will be modeled below.

[0067] 1. The relationship between the scattered electric field and the incident electric field.

[0068] First, establish Figure 2 In the spatial coordinate system shown, the origin of the coordinate system is located at the center of the foil strip, the Z axis is vertically upward, the XOY plane is a horizontal plane, and the Y axis is selected as the east direction.

[0069] Assume that the orientation vector of the foil strip is , whose azimuth is , The angle with the positive Z axis is The direction of the scattered electric field is , whose azimuth is , The angle with the positive Z axis is , Elevation angle to radar line of sight The relationship is ; θ is the angle between the electric field direction and the dipole orientation direction; the unit direction vector of the incident wave is It means that the propagation direction of the incident electric field is far away and points to the origin of the coordinate system, which is opposite to the propagation direction of the scattered electric field, that is, , so the propagation direction of the incident electric field is ( , ).

[0070] Next, establish the polarization coordinate system, such as Figure 3 As shown, the center of the dipole is taken as the origin, the direction of electric field incidence is taken as the Z axis, the horizontal polarization direction is taken as the X axis, and the vertical polarization direction is taken as the Y axis. Assume that the polarization direction of the dipole scattered electric field is , is the dipole orientation vector Reversal of the projection direction in the polar coordinate plane.

[0071] For an incident wave of arbitrary polarization, it can be expressed in the polarization coordinate system as , E in is the electric field of the incident wave; E h1 is the horizontal component of the incident wave; E v1 is the vertical component of the incident wave; e h is the unit vector of the horizontal component; e vis the unit vector of the vertical component; according to the secondary scattering formula of the dipole, ignoring the phase delay caused by propagation, the scattered electric field can be expressed as: .

[0072] Where L is the equivalent length of the dipole, , is the characteristic impedance of free space, is the scattering impedance of the dipole, is the distance from the dipole center to the field point, is the angle between the electric field direction and the dipole orientation direction, is the azimuth of the dipole orientation in the polar coordinate system, E h2 is the horizontal component of the scattered electric field; E v2 is the vertical component of the scattered electric field.

[0073] The length of the foil strip is generally taken as half the wavelength of the suppressed radar.

[0074] According to the spatial geometric relationship, we can get: .

[0075] 2. Solve for the Sinclair matrix of the foil strip.

[0076] According to radar polarization theory, the Sinclair matrix of the target can link the polarization states of the incident field and the scattered field, which can be expressed as: .

[0077] Among them, the distance factor .

[0078] The polarization scattering matrix S of the dipole is: .

[0079] 3. Solve the Mueller matrix of a single foil strip.

[0080] Since chaff cloud is a complex undulating target and its scattered echo is a partially polarized wave, it is more practical to use Stokes parameters to characterize its statistical scattering polarization characteristics.

[0081] ;in, and are the Stokes vectors of the incident wave and the scattered wave respectively, M is the Mueller matrix of the polarization scattering of a single foil strip, and the relationship between it and the scattering matrix is: .

[0082] Where R is the radius of the chaff cloud, , j is a plural unit; for conjugation; is the kronecher direct product.

[0083] set up is the average Mueller matrix of a single foil strip, and its calculation formula is: .

[0084] in, The spatial orientation of the foil strip is The Mueller matrix of a single foil strip is is the area element on the unit sphere, is the spatial orientation of the foil strip The probability density function of .

[0085] 4. Radar polarization mode normalized Stokes vector.

[0086] The polarization modes currently used by radars mainly include horizontal polarization (normalized Stokes vector is ), vertical polarization (normalized Stokes vector is ), left-hand circular polarization (normalized Stokes vector is ) and right-hand circular polarization (normalized Stokes vector is ), among which T is the transpose.

[0087] 5. Average RCS of a single foil strip.

[0088] According to polarization theory, for any transmit / receive polarization mode, assuming that the normalized Stokes vector of the transmit polarization is , the normalized Stokes vector of the receiving polarization is , the average Mueller matrix of a single foil strip is , then the average RCS of a single foil strip under this transmit / receive polarization mode can be expressed as: .

[0089] According to the above modeling process, the average RCS of a single foil strip in various different transmit and receive polarization modes under the polarization modes used by current radars can be obtained. The following is a calculation formula for the average RCS of foil strips under commonly used polarization modes.

[0090] When the polarization mode used by the radar is horizontal or vertical polarization, .

[0091] When the transmit / receive polarization mode used by the radar is circular polarization, .

[0092] When circular polarization is transmitted and horizontal or vertical polarization is received, .

[0093] Reciprocity can be used to obtain horizontal or vertical transmission and circular polarization reception. , .

[0094] The foil strip spatial orientation is uniformly distributed on the sphere. For foil strip spatial orientation, it is completely random. The spatial orientation of the foil strips in the polarized coordinate system when they are uniformly distributed on the spherical surface It also obeys the uniform distribution on the sphere, so we have .

[0095] The average Mueller matrix of a single foil strip is obtained when the foil strip spatial orientation is uniformly distributed on the spherical surface. for .

[0096] in, ,Will , , Substituting the above conclusions, we can find the average RCS of the foil strips under the commonly used polarization mode when the foil strip cloud is uniformly distributed on the spherical surface. .

[0097] For practical applications, the assumption that the spatial orientation of the foil cloud is completely random is too simplistic and can only be applied to the short time after the foil explodes. According to the latest research, it is proved that the more realistic assumption of the orientation distribution of the foil is the azimuth (i.e. )exist The range is uniformly distributed, and the foil strip orientation angle is The probability distribution is relatively concentrated at a certain inclination and a certain degree of dispersion (also known as variance ). The probability distribution of The horizontal plane is symmetrical up and down, so we can use " exist Inclination and is centered and has a variance of The probability distribution of the foil strip orientation angle is approximately described by the "normal distribution". Therefore, the probability density function of the foil strip spatial orientation angle can be expressed as .

[0098] in, .

[0099] Because it is difficult to The probability density function is derived from The analytical expression of the probability density function of is obeyed. The integral result of the above formula is difficult to obtain an accurate expression, so the numerical integration method is used.

[0100] The posture of the foil strip is related to many physical properties of the foil strip, the factors of delivery, airflow and other factors. The main postures of the foil strip at sea are as follows:

[0101] Horizontal motion state, horizontal normal distribution To represent this situation.

[0102] The spiral motion state is a double-skewed normal distribution. Represents this situation.

[0103] Vertical normal distribution, with vertical normal distribution To represent this situation.

[0104] Random orientation state: When the chaff bomb is just launched and within a very short time after the explosion, the chaff is randomly oriented, which can be represented by a uniform distribution on a spherical surface.

[0105] In another exemplary embodiment of the present application, step 102 is replaced by the following steps 301 to 305 .

[0106] Step 301: Divide the plane electromagnetic wave energy incident on the foil strip cloud into two parts of plane electromagnetic wave energy; wherein, one part of the plane electromagnetic wave energy is scattered in the direction opposite to the incident direction, and the other part of the plane electromagnetic wave energy continues to propagate forward along the incident direction and passes through the foil strip cloud.

[0107] Step 302: Determine the calculation method of the foil cloud ball area according to the two divided parts of plane electromagnetic wave energy.

[0108] Step 303: split the spherical foil strip cloud into cubic units according to the finite element method to determine the foil strip units.

[0109] Step 304: Determine the RCS of the foil strip unit based on the single foil strip RCS model.

[0110] Step 305: Based on the calculation method of the chaff cloud ball area and according to the RCS of the chaff unit, a chaff cloud RCS model is constructed; the chaff cloud RCS model is used to characterize the maximum radar cross-sectional area of ​​the chaff cloud.

[0111] In practical applications, the RCS generated by a collection of N foil strips is the sum of the RCS generated by each foil strip at the corresponding frequency; if all foil strips are the same, then the RCS generated by N foil strips is N times the RCS of each foil strip. However, in reality, the RCS of N foil strips is always N times smaller than the RCS of a single foil strip. This is mainly due to the influence of factors such as the shielding effect, blocking effect and shielding effect of the foil strip cloud, which are actually mutual coupling effects; if the mutual coupling distance is greater than After that, that is, the distance between the foil strips is greater than These effects are not taken into account.

[0112] The following mainly considers the backward RCS of the foil cloud. Assume that the density is constant, that is, the electromagnetic energy leaked through the side of the sphere can be ignored. Therefore, the plane electromagnetic wave energy incident from the left side of the foil cloud is It must be divided into two parts, one part is energy Scattered back in the opposite direction, another part of the energy will continue to propagate forward and eventually pass through the chaff cloud. Figure 4 shown.

[0113] Since the foil strip is assumed to be an ideal conductor, we obtain: .

[0114] therefore, .

[0115] set up is a channel parallel to the propagation direction of electromagnetic waves: ;in, r is the surface area element.

[0116] Corresponding to the same depth , thickness is The projected area of ​​the spherical foil cloud unit in the incident direction for: .

[0117] The RCS of this chaff unit is: ;in, is the effective foil density, in pieces / m 3 , is the average effective RCS of a single foil strip.

[0118] , It is the total effective number of chaff strips after correction.

[0119] We can get: .

[0120] In the initial stage of the chaff cloud dispersal, When I was very young, When it is very large, the cross-sectional area can be simplified to: .

[0121] That is, at this time, the RCS of the spherical foil cloud is approximately equal to its projection area in the direction of electromagnetic wave propagation. When it becomes very big, Very small, at this time, the maximum radar cross-sectional area of ​​the foil cloud is: .

[0122] In another exemplary embodiment of the present application, step 103 is replaced by the following steps 401 to 405.

[0123] Step 401: Based on the RCS model of the foil cloud, determine the Doppler frequency shift generated when the foil cloud moves horizontally.

[0124] Step 402: Determine the Doppler frequency shift caused by the speed fluctuation of each foil strip unit according to the Doppler frequency shift generated when the foil strip cloud moves horizontally.

[0125] Step 403: Determine the Doppler frequency shift of each foil strip unit according to the Doppler frequency shift generated when the foil strip cloud moves horizontally and the Doppler frequency shift caused by the speed fluctuation of each foil strip unit.

[0126] Step 404: Determine the unit echo signal of the foil strip unit that can generate an echo according to the Doppler frequency shift of each foil strip unit.

[0127] In practical applications, after the RCS of the chaff cloud is generated, the next step is to consider the echo of the chaff cloud, because it is unrealistic to calculate the echo of the chaff cloud one by one. Based on the analysis of the characteristics of chaff strips and the radar scattering cross-section of chaff strip clouds in the previous article, the specific simulation process of chaff strip cloud echo is established as follows: Figure 5 shown.

[0128] When the radar beam hits the chaff cloud, in the absence of wind, its downward motion is perpendicular to the direction of the incident wave or the angle is small, which hardly causes Doppler shift. The speeds are not the same, and the motion component in the horizontal direction will produce a frequency shift, that is, each There will be a Doppler frequency shift. In this application, the Doppler effect caused by △V rotation is not considered.

[0129] like Figure 6 As shown, it is assumed that the foil cloud is spherical with a radius of R. The coordinates of the center of the foil cloud are Consider the circumscribed cube of the foil cloud. Take a vertex of the cube as the origin and the three corresponding edges as the X-axis, Y-axis, and Z-axis to establish a coordinate system. In the XYZ coordinate system, assume that the cube is filled with foil strips with the same density as the foil cloud. If we divide this cube into small cubes, then the volume of each small cube is .

[0130] So we get For these small cubic units, if their centers are within the chaff cloud sphere, that is, the distance to the center of the chaff cloud sphere is less than , then this unit is considered to belong to the chaff cloud and its echo needs to be considered, otherwise it is not considered. The total RCS of the chaff cloud at any time is divided by the volume of the chaff cloud ball to get the RCS per unit volume, and then multiplied by The RCS of each chaff cloud unit is obtained.

[0131] Because each The positions are different, so different time delays will inevitably occur. Due to the influence of wind speed, first, the translation of the foil cloud will produce a Doppler frequency shift; secondly, it is believed that the movement speed of each small cube of the foil cloud is not consistent, and there will be a speed fluctuation. Here, it is believed that this fluctuation obeys the normal distribution, so the Doppler frequency shift caused by the speed fluctuation of each small cube can be obtained; then, the Doppler frequency shift caused by the translation of the foil cloud is added to the Doppler frequency shift caused by the speed fluctuation of each small cube, and the Doppler frequency shift of this small cube is obtained; then, the echo of this small cube can be generated; finally, the echo of all small cubes is added to get the overall echo signal of the foil cloud.

[0132] Based on the same inventive concept, the embodiment of the present application also provides a foil strip modeling system for implementing the foil strip modeling method involved above. The implementation scheme for solving the problem provided by the system is similar to the implementation scheme recorded in the above method.

[0133] In an exemplary embodiment, a foil modeling system is provided, comprising:

[0134] The single foil strip RCS model building module is used to model the RCS of a single foil strip under polarization conditions and build a single foil strip RCS model.

[0135] The foil cloud RCS model building module is used to set the foil cloud as a spherical foil cloud, split the spherical foil cloud into cubic units according to the finite element method, and build a foil cloud RCS model based on the single foil RCS model.

[0136] The unit echo signal determination module is used to determine the unit echo signal of the foil strip unit that can generate an echo based on the foil strip cloud RCS model.

[0137] The overall echo signal determination module is used to determine the overall echo signal of the foil strip cloud according to all unit echo signals; the overall echo signal is used to characterize the overall scattering characteristics of the foil strip interference.

[0138] In an exemplary embodiment, a computer device is provided, which can be a server or a terminal. The computer device includes a processor, a memory, an input / output interface (I / O for short) and a communication interface. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store chaff modeling data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a chaff modeling method is implemented.

[0139] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0140] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0141] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0142] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0143] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0144] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0145] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0146] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A foil strip modeling method, characterized in that: The foil strip modeling method comprises: The RCS of a single foil strip under polarization conditions is modeled, and a single foil strip RCS model is constructed, including: Taking the center of a single foil strip as the origin, the horizontal plane as the XOY plane, the due east direction as the Y axis, and the vertical upward direction as the Z axis, a spatial coordinate system is suggested, and based on the spatial coordinate system, a polarization coordinate system is suggested; the polarization coordinate system is established with the center of the dipole as the origin, the electric field incident direction as the Z axis, the horizontal polarization direction as the X axis, and the vertical polarization direction as the Y axis; Based on the polarization coordinate system and according to the spatial geometric relationship, determining the relationship between the scattered electric field and the incident electric field; According to radar polarization theory, the polarization scattering matrix of the dipole of a single foil strip is determined based on the relationship between the scattered electric field and the incident electric field; Solve the average Mueller matrix of a single foil strip based on the dipole polarization scattering matrix; A single foil strip RCS model is constructed according to the average Mueller matrix; the single foil strip RCS model is used to calculate the average RCS of the single foil strip under polarization mode; The foil strip cloud is set as a spherical foil strip cloud, the spherical foil strip cloud is split into cubic units according to the finite element method, and a foil strip cloud RCS model is constructed based on the single foil strip RCS model; Based on the chaff cloud RCS model, determining a unit echo signal of a chaff unit capable of generating an echo; The overall echo signal of the foil cloud is determined based on all unit echo signals; the overall echo signal is used to characterize the overall scattering characteristics of the foil interference.

2. A foil modeling method according to claim 1, characterized in that, The single chaff RCS model for: ； in, E in is the electric field of the incident wave; J r is the normalized Stokes vector of the receive polarization; J t is the normalized Stokes vector of transmit polarization; is the average Mueller matrix of a single foil strip; r is the distance from the dipole center to the field point.

3. A foil modeling method according to claim 1, characterized in that, The foil strip cloud is set as a spherical foil strip cloud, the spherical foil strip cloud is split into cubic units according to the finite element method, and the foil strip cloud RCS model is constructed based on the single foil strip RCS model, which specifically includes: The plane electromagnetic wave energy incident on the foil strip cloud is divided into two parts of plane electromagnetic wave energy; wherein one part of the plane electromagnetic wave energy is scattered in the direction opposite to the incident direction, and the other part of the plane electromagnetic wave energy continues to propagate forward along the incident direction and passes through the foil strip cloud; The calculation method of determining the area of ​​the foil cloud ball according to the divided two parts of plane electromagnetic wave energy; Decomposing the spherical foil strip cloud into cubic units according to the finite element method to determine the foil strip units; Determining the RCS of the chaff unit based on the single chaff RCS model; Based on the calculation method of the chaff cloud ball area and according to the RCS of the chaff unit, a chaff cloud RCS model is constructed; the chaff cloud RCS model is used to characterize the maximum radar scattering cross-section of the chaff cloud.

4. A foil modeling method according to claim 3, characterized in that: The maximum radar cross-sectional area of ​​the chaff cloud S max for: ； Where R is the radius of the chaff cloud; is the effective foil density; is the average effective RCS of a single chaff strip; It is the total effective number of chaff strips after correction.

5. A foil modeling method according to claim 1, characterized in that: Based on the chaff cloud RCS model, determining the unit echo signal of the chaff unit capable of generating an echo specifically includes: Based on the chaff cloud RCS model, determining the Doppler frequency shift generated when the chaff cloud moves horizontally; Determining the Doppler frequency shift caused by the speed fluctuation of each foil strip unit according to the Doppler frequency shift generated when the foil strip cloud moves horizontally; Determine the Doppler frequency shift of each foil strip unit according to the Doppler frequency shift generated when the foil strip cloud moves horizontally and the Doppler frequency shift caused by the speed fluctuation of each foil strip unit; The unit echo signal of the foil strip unit capable of generating an echo is determined according to the Doppler frequency shift of each foil strip unit.

6. A chaff modeling system, characterized in that: include: The single foil strip RCS model building module is used to model the RCS of a single foil strip under polarization conditions and build a single foil strip RCS model, which specifically includes: Taking the center of a single foil strip as the origin, the horizontal plane as the XOY plane, the due east direction as the Y axis, and the vertical upward direction as the Z axis, a spatial coordinate system is suggested, and based on the spatial coordinate system, a polarization coordinate system is suggested; the polarization coordinate system is established with the center of the dipole as the origin, the electric field incident direction as the Z axis, the horizontal polarization direction as the X axis, and the vertical polarization direction as the Y axis; Based on the polarization coordinate system and according to the spatial geometric relationship, determining the relationship between the scattered electric field and the incident electric field; According to the radar polarization theory, the polarization scattering matrix of the dipole of a single foil strip is determined based on the relationship between the scattered electric field and the incident electric field; Solve the average Mueller matrix of a single foil strip based on the dipole polarization scattering matrix; A single foil strip RCS model is constructed according to the average Mueller matrix; the single foil strip RCS model is used to calculate the average RCS of the single foil strip under polarization mode; A foil cloud RCS model building module is used to set the foil cloud to a spherical foil cloud, split the spherical foil cloud into cubic units according to the finite element method, and build a foil cloud RCS model based on the single foil RCS model; A unit echo signal determination module, used for determining a unit echo signal of a chaff unit capable of generating an echo based on the chaff cloud RCS model; The overall echo signal determination module is used to determine the overall echo signal of the foil strip cloud according to all unit echo signals; the overall echo signal is used to characterize the overall scattering characteristics of the foil strip interference.

7. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement a foil strip modeling method according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, a foil strip modeling method according to any one of claims 1 to 5 is implemented.

9. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, a foil strip modeling method according to any one of claims 1 to 5 is implemented.

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