CN112711874A - Method and device for selecting plasma coating target wide-band radar wave-absorbing parameters - Google Patents
Method and device for selecting plasma coating target wide-band radar wave-absorbing parameters Download PDFInfo
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Abstract
A method and a device for selecting radar wave-absorbing parameters of a plasma coating target in a wide frequency band comprise the following steps: establishing a plasma coating target wide-band radar wave-absorbing electromagnetic calculation model; determining the variation range of the plasma coating target optimization parameters; randomly selecting an initial value of a plasma coating target parameter within the variation range of the optimized parameter; calculating the wave absorbing effect of the wide-band radar of the plasma coating target wide-band radar wave absorbing electromagnetic calculation model by using a time domain finite difference method; updating the plasma coating target parameters by a parameter optimization method; and jumping out of the parameter optimization cycle through a preset optimization termination condition to obtain a parameter value corresponding to the plasma coating target broadband radar wave absorption. The method can realize the optimized selection of corresponding parameters aiming at the wave absorption requirements of the plasma coating target broadband radar, and is used for the stealth optimization design of a target structure.
Description
Technical Field
The invention relates to the field of plasma coating target parameter optimization, in particular to a method and a device for selecting radar wave-absorbing parameters of a plasma coating target in a wide frequency band.
Background
With the continuous improvement of radar detection and anti-stealth technologies, the requirement of target stealth and defense cannot be met by simply changing the appearance of a target. The plasma radar wave-absorbing technology is an effective means for avoiding radar detection, has a plurality of unique advantages of high absorption rate, wide wave-absorbing frequency band and the like, has the wave-absorbing capacity of the target equipment electromagnetic wave wide-frequency-band radar, and has wide application prospect. With the research, the plasma radar wave-absorbing technology is gradually applied to the aspects of plasma stealth device design and military target stealth. Due to the complexity of the wave absorbing mechanism of the plasma radar, the optimization and selection of plasma parameters aiming at the wave absorbing requirement of a specific target electromagnetic broadband section become difficult to realize. Therefore, a new parameter optimization method capable of realizing the plasma coating target broadband radar wave absorption is needed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method and a device for selecting radar wave-absorbing parameters of a plasma coating target broadband, which solve the problem that the selection of parameters corresponding to the radar wave-absorbing of the plasma coating target broadband is difficult to realize due to the complex radar wave-absorbing mechanism of the plasma coating target in the past.
In a first aspect, the invention provides a method for selecting radar wave-absorbing parameters of a plasma coating target in a wide frequency band, which comprises the following steps:
establishing a plasma coating target wide-band radar wave-absorbing electromagnetic calculation model;
determining the variation range of the plasma coating target optimization parameters; randomly selecting an initial value of a plasma coating target parameter within the variation range of the optimized parameter;
calculating the wave absorbing effect of the wide-band radar of the plasma coating target wide-band radar wave absorbing electromagnetic calculation model by using a time domain finite difference method;
updating the plasma coating target parameters by a parameter optimization method;
and jumping out of the parameter optimization cycle through a preset optimization termination condition to obtain a parameter value corresponding to the plasma coating target broadband radar wave absorption.
Preferably, the establishing of the plasma coating target wide-band radar wave-absorbing electromagnetic calculation model comprises the following steps:
coating plasma on the outer surface of a target, and setting the thickness of the plasma coating;
the plasma coating Maxwell's equation set under the electromagnetic calculation model is as follows:
wherein ,
is an electric field, and is,
is a magnetic field and is used for generating a magnetic field,
is the polarization current density, omegapDenotes the plasma frequency, v is the electron impact frequency, ε0Is dielectric constant in vacuum, mu0Is the permeability in vacuum.
Preferably, determining the variation range of the plasma coating target optimization parameter; randomly selecting an initial value of a plasma coating target parameter within the variation range of the optimized parameter comprises:
determining parameters influencing the radar wave absorption effect of the plasma coating target, including the plasma frequency omegapElectron impact frequency v and coating thickness d;
determining plasma frequency omegapThe variation range is a1≤ωp≤a2The electron impact frequency v varies within a range of b1≤v≤b2The coating thickness d varies within a range of c1≤d≤c2, wherein a1、a2、b1、b2、c1、c2Respectively plasma frequency omegapThe minimum value and the maximum value of the variation range of the electron collision frequency v and the coating thickness d are initialized by adopting the following formula:
ωp＝(a2-a1)·rand
ν＝(b2-b1)·rand
d＝(c2-c1)·rand
wherein rand represents a random value between 0 and 1.
Preferably, the method for calculating the wave-absorbing effect of the wide-band radar of the plasma coating target wave-absorbing electromagnetic calculation model by using a finite difference time domain method comprises the following steps:
substituting the obtained parameter values into a Maxwell's equation set coated by the plasma, and calculating the corresponding reflectivity by a plasma time domain finite difference method;
and obtaining the radar wave absorbing effect of the plasma coating target according to the corresponding relation between the reflectivity and the radar wave absorbing effect.
Preferably, updating the plasma coating target parameters by the parameter optimization method comprises:
determining a cost function corresponding to the parameter optimization method as follows: fcost ═ max (Reflection (from f)min～fmax))；
wherein ,fmin and fmaxFrequency minimum and frequency maximum, max (from f), respectively, for a wide frequency bandmin～fmax) ) indicates selection of a wide frequency band fminTo fmaxMaximum value of reflectivity of;
and circularly updating and optimizing the plasma coating parameters by a biological optimization method based on the cost function.
Preferably, the preset optimization termination condition comprises one of the following:
optimizing the iteration times to reach a preset maximum value;
the cost function is less than a predetermined minimum.
Preferably, obtaining parameter values corresponding to the plasma coating target broadband radar wave absorption includes:
and the optimal parameter value obtained by jumping out of the optimization cycle by the cycle jumping-out judgment condition is the parameter value required by the wave absorption of the corresponding plasma coating target broadband radar.
Preferably, the plasma coating parameter obtained by radar wave absorption optimization of the plasma coating target in the 5 to 10GHz wide frequency band is the plasma frequency omegap87GHz, 100GHz and 92mm coating thickness d, the reflectivity is less than-18 dB, and the radar electromagnetic wave energy absorbing effect is at least 98.85 percent.
In a second aspect, the present invention further provides a device for selecting radar wave-absorbing parameters of a plasma coating target in a wide frequency band, which is characterized by comprising:
the modeling module is used for establishing a plasma coating target wide-frequency-band radar wave-absorbing electromagnetic calculation model;
a parameter module configured to determine a variation range of a plasma coating target optimization parameter; randomly selecting an initial value of a plasma coating target parameter within the variation range of the optimized parameter;
the calculation module is used for calculating the wave absorbing effect of the wide-band radar of the plasma coating target wide-band radar wave absorbing electromagnetic calculation model by using a finite difference time domain method;
an update module configured to update a plasma coating target parameter by a parameter optimization method;
and the acquisition module is set to jump out of the parameter optimization cycle through a preset optimization termination condition to obtain a parameter value corresponding to the plasma coating target wide-band radar wave absorption.
In another aspect, the present invention also provides a computer-readable storage medium, in which a computer program is stored, which computer program, when executed by a processor, implements the above-described method.
Compared with the prior art, the invention has the following advantages:
the method is used for optimizing the radar wave-absorbing parameters of the plasma coating target in the wide frequency band based on the biological optimization algorithm, does not need to carry out complex stealth mechanism research, only needs to update and optimize a plurality of plasma parameters through the optimization algorithm, sets different parameter optimization cycle jump-out conditions according to different radar wave-absorbing requirements, and can optimize and obtain the parameters meeting the requirements.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a flow chart of a method for selecting wave-absorbing parameters of a plasma coating target broadband radar in an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a plasma coating target wide-band radar wave-absorbing electromagnetic calculation model in an embodiment of the invention;
FIG. 3 is a graph of electromagnetic wave reflectivity for a wide band of a plasma coating target in accordance with an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a plasma coating target broadband radar wave-absorbing parameter selection device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Example one
Fig. 1 is a flowchart of a method for selecting radar wave-absorbing parameters of a plasma coating target in a wide frequency band, which may include steps S101 to S105:
s101, establishing a plasma coating target wide-band radar wave-absorbing electromagnetic calculation model;
s102, determining the variation range of the plasma coating target optimization parameters; randomly selecting an initial value of a plasma coating target parameter within the variation range of the optimized parameter;
s103, calculating the wave absorbing effect of the wide-band radar of the plasma coating target wide-band radar wave absorbing electromagnetic calculation model by using a finite difference time domain method;
s104, updating the plasma coating target parameters by a parameter optimization method;
and S105, jumping out of a parameter optimization cycle through a preset optimization termination condition to obtain a parameter value corresponding to the plasma coating target wide-band radar wave absorption.
The embodiment of the invention firstly establishes a plasma coating target radar wave-absorbing electromagnetic calculation model. Then determining the variation range of parameters to be optimized of the plasma coating target, and randomly selecting the initial value of the plasma parameters in the parameter range; then, calculating the broadband radar wave absorption effect of the plasma coating target electromagnetic model by using a time domain finite difference method, and updating the parameters of the plasma coating target by using a parameter optimization method; and finally, jumping out of a parameter optimization cycle through a preset optimization termination condition to obtain a parameter value corresponding to the plasma coating target broadband radar wave absorption. The embodiment of the invention can realize the optimized selection of the wave-absorbing corresponding parameters of the plasma coating target wide-band radar, and can be used for the stealth design of the target wide-band.
In the embodiment of the invention, the step S101 of establishing the plasma coating target wide-band radar wave-absorbing electromagnetic calculation model comprises the following steps:
coating plasma on the outer surface of a target, and setting the thickness of the plasma coating;
the plasma coating Maxwell's equation set under the electromagnetic calculation model is as follows:
wherein ,
is an electric field, and is,
is a magnetic field and is used for generating a magnetic field,
is the polarization current density of the polarized light,ωpdenotes the plasma frequency, v is the electron impact frequency, ε0Is dielectric constant in vacuum, mu0Is the permeability in vacuum.
The structural schematic diagram of the plasma coating target wide-band radar wave-absorbing electromagnetic calculation model is shown in fig. 2, and plasma is coated on a target shell. In fig. 2, 1 is the target outer surface, 2 is the plasma coating, 3 is the plasma coating thickness, 4 is the incident electromagnetic wave in solid line and the reflected electromagnetic wave in dashed line.
The parameter influencing the radar wave absorption effect of plasma coating has the plasma frequency omegapThree parameters, electron impact frequency v and coating thickness d. When parameter initialization is carried out, parameter values need to be randomly selected in the variation range of the three parameters, so in the embodiment of the invention, step S102 determines the variation range of the plasma coating target optimization parameters; randomly selecting an initial value of a plasma coating target parameter within the variation range of the optimized parameter comprises:
determining parameters influencing the radar wave absorption effect of the plasma coating target, including the plasma frequency omegapElectron impact frequency v and coating thickness d;
determining plasma frequency omegapThe variation range is a1≤ωp≤a2The electron impact frequency v varies within a range of b1≤v≤b2The coating thickness d varies within a range of c1≤d≤c2, wherein a1、a2、b1、b2、c1、c2Respectively plasma frequency omegapThe minimum value and the maximum value of the variation range of the electron collision frequency v and the coating thickness d are initialized by adopting the following formula:
ωp＝(a2-a1)·rand
ν＝(b2-b1)·rand
d＝(c2-c1)·rand
wherein rand represents a random value between 0 and 1.
In the embodiment of the invention, the step S103 of calculating the wave-absorbing effect of the wide-band radar of the plasma coating target wave-absorbing electromagnetic calculation model by using a finite difference time domain method comprises the following steps:
substituting the obtained parameter values into a Maxwell's equation set coated by the plasma, and calculating the corresponding reflectivity by a plasma time domain finite difference method;
and obtaining the radar wave absorbing effect of the plasma coating target according to the corresponding relation between the reflectivity and the radar wave absorbing effect.
In the embodiment of the present invention, the step S104 of updating the plasma coating target parameter by the parameter optimization method includes:
determining a cost function corresponding to the parameter optimization method as follows: fcost ═ max (Reflection (from f)min～fmax))；
wherein ,fmin and fmaxFrequency minimum and frequency maximum, max (from f), respectively, for a wide frequency bandmin～fmax) ) indicates selection of a wide frequency band fminTo fmaxMaximum value of reflectivity of;
and circularly updating and optimizing the plasma coating parameters by a biological optimization method based on the cost function.
In the embodiment of the present invention, the preset optimization termination condition in step S105 includes one of the following conditions:
optimizing the iteration times to reach a preset maximum value;
the cost function is less than a predetermined minimum.
In the embodiment of the invention, the parameter values corresponding to the plasma coating target broadband radar wave absorption obtained in the step S105 comprise:
and the optimal parameter value obtained by jumping out of the optimization cycle by the cycle jumping-out judgment condition is the parameter value required by the wave absorption of the corresponding plasma coating target broadband radar.
In the embodiment of the invention, the plasma coating parameter obtained by the radar wave absorption optimization of the plasma coating target with the wide frequency band of 5-10 GHz is the plasma frequency omegap87GHz, electron impact frequency v 100GHz and coating thickness d92mm, the reflectivity is less than-18 dB, and the wave absorbing effect of the radar electromagnetic wave energy is at least 98.85 percent.
Plasma frequency omega obtained by wave absorption optimization of 5-10 GHz wide-band plasma coating target radarp87GHz, 100GHz for electron collision frequency v and 92mm for coating thickness d, the corresponding electromagnetic wave reflectivity is shown in figure 3, the reflectivity is less than-18 dB in a wide frequency band of 5 to 10GHz, and the radar electromagnetic wave energy absorbing effect is at least 98.85% in the wide frequency band of 5 to 10GHz for a plasma coating target.
Example two
As shown in fig. 4, an embodiment of the present invention provides a plasma coating target broadband radar wave-absorbing parameter selection apparatus, including:
the modeling module 100 is configured to establish a plasma coating target wide-band radar wave-absorbing electromagnetic calculation model;
a parameter module 200 configured to determine a variation range of a plasma coating target optimization parameter; randomly selecting an initial value of a plasma coating target parameter within the variation range of the optimized parameter;
the calculation module 300 is configured to calculate the wave-absorbing effect of the plasma coating target broadband radar wave-absorbing electromagnetic calculation model broadband radar by using a finite difference time domain method;
an update module 400 configured to update the plasma coating target parameter by a parameter optimization method;
the obtaining module 500 is configured to jump out of a parameter optimization cycle through a preset optimization termination condition to obtain a parameter value corresponding to the plasma coating target wide-band radar wave absorption.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Claims (10)
1. A method for selecting radar wave-absorbing parameters of a plasma coating target in a wide frequency band is characterized by comprising the following steps:
establishing a plasma coating target wide-band radar wave-absorbing electromagnetic calculation model;
determining the variation range of the plasma coating target optimization parameters; randomly selecting an initial value of a plasma coating target parameter within the variation range of the optimized parameter;
calculating the wave absorbing effect of the wide-band radar of the plasma coating target wide-band radar wave absorbing electromagnetic calculation model by using a time domain finite difference method;
updating the plasma coating target parameters by a parameter optimization method;
and jumping out of the parameter optimization cycle through a preset optimization termination condition to obtain a parameter value corresponding to the plasma coating target broadband radar wave absorption.
2. The parameter selection method according to claim 1, wherein the establishing of the plasma coating target broadband radar wave-absorbing electromagnetic calculation model comprises:
coating plasma on the outer surface of a target, and setting the thickness of the plasma coating;
the plasma coating Maxwell's equation set under the electromagnetic calculation model is as follows:
wherein ,
is an electric field, and is,
is a magnetic field and is used for generating a magnetic field,
is the polarization current density, omegapDenotes the plasma frequency, v is the electron impact frequency, ε0Is dielectric constant in vacuum, mu0Is the permeability in vacuum.
3. The parameter selection method according to claim 1, wherein a variation range of the plasma coating target optimization parameter is determined; randomly selecting an initial value of a plasma coating target parameter within the variation range of the optimized parameter comprises:
determining parameters influencing the radar wave absorption effect of the plasma coating target, including the plasma frequency omegapElectron impact frequency v and coating thickness d;
determining plasma frequency omegapThe variation range is a1≤ωp≤a2The electron impact frequency v varies within a range of b1≤v≤b2The coating thickness d varies within a range of c1≤d≤c2, wherein a1、a2、b1、b2、c1、c2Respectively plasma frequency omegapThe minimum value and the maximum value of the variation range of the electron collision frequency v and the coating thickness d are initialized by adopting the following formula:
ωp＝(a2-a1)·rand
ν＝(b2-b1)·rand
d＝(c2-c1)·rand
wherein rand represents a random value between 0 and 1.
4. The parameter selection method according to claim 3, wherein the step of calculating the wave-absorbing effect of the wide-band radar of the plasma coating target wide-band radar wave-absorbing electromagnetic calculation model by using a finite difference time domain method comprises the following steps:
substituting the obtained parameter values into a Maxwell's equation set coated by the plasma, and calculating the corresponding reflectivity by a plasma time domain finite difference method;
and obtaining the radar wave absorbing effect of the plasma coating target according to the corresponding relation between the reflectivity and the radar wave absorbing effect.
5. The parameter selection method according to any one of claims 1 to 4, wherein the updating of the plasma coating target parameter by the parameter optimization method comprises:
determiningThe cost function corresponding to the parameter optimization method is as follows: fcost ═ max (Reflection (from f)min～fmax))；
wherein ,fmin and fmaxFrequency minimum and frequency maximum, max (from f), respectively, for a wide frequency bandmin～fmax) ) indicates selection of a wide frequency band fminTo fmaxMaximum value of reflectivity of;
and circularly updating and optimizing the plasma coating parameters by a biological optimization method based on the cost function.
6. The parameter selection method according to claim 5, wherein the preset optimization termination condition comprises one of the following conditions:
optimizing the iteration times to reach a preset maximum value;
the cost function is less than a predetermined minimum.
7. The parameter selection method according to claim 5, wherein obtaining the parameter values corresponding to the plasma coating target broadband radar wave absorption comprises:
and the optimal parameter value obtained by jumping out of the optimization cycle by the cycle jumping-out judgment condition is the parameter value required by the wave absorption of the corresponding plasma coating target broadband radar.
8. The parameter selection method according to claim 7, wherein the plasma coating parameter obtained by optimizing the radar wave absorption of the plasma coating target in the 5 to 10GHz wide frequency band is the plasma frequency omegap87GHz, 100GHz and 92mm coating thickness d, the reflectivity is less than-18 dB, and the radar electromagnetic wave energy absorbing effect is at least 98.85 percent.
9. A plasma coating target wide band section radar wave absorption parameter selection device is characterized by comprising:
the modeling module is used for establishing a plasma coating target wide-frequency-band radar wave-absorbing electromagnetic calculation model;
a parameter module configured to determine a variation range of a plasma coating target optimization parameter; randomly selecting an initial value of a plasma coating target parameter within the variation range of the optimized parameter;
the calculation module is used for calculating the wave absorbing effect of the wide-band radar of the plasma coating target wide-band radar wave absorbing electromagnetic calculation model by using a finite difference time domain method;
an update module configured to update a plasma coating target parameter by a parameter optimization method;
and the acquisition module is set to jump out of the parameter optimization cycle through a preset optimization termination condition to obtain a parameter value corresponding to the plasma coating target wide-band radar wave absorption.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-8.
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