CN113126053B - Method and device for evaluating radar cross section of ship - Google Patents
Method and device for evaluating radar cross section of ship Download PDFInfo
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- CN113126053B CN113126053B CN202110375590.6A CN202110375590A CN113126053B CN 113126053 B CN113126053 B CN 113126053B CN 202110375590 A CN202110375590 A CN 202110375590A CN 113126053 B CN113126053 B CN 113126053B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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Abstract
The application relates to the technical field of ship radars, and discloses a method for evaluating a ship radar scattering cross section, which comprises the following steps: receiving electromagnetic wave beam information of a grazing sea incidence azimuth; preprocessing an electromagnetic wave beam in a sea-sweeping incidence direction based on a sea surface model to generate a coupling wave beam; calculating ship electromagnetic scattering energy echo by taking the coupled wave beam as an incident wave; coupling the ship electromagnetic scattering energy echo with the sea surface model to generate a ship scattering energy echo; and calculating the radar cross section of the ship on the sea surface in the sea sweeping direction. According to the method, the non-planar incident wave can be obtained through coupling processing of the configuration information of the electromagnetic wave beam and the preset sea surface model, and further the scattering characteristics of the ship radar under the irradiation of the non-planar incident wave are analyzed, so that the scattering cross section of the ship radar is obtained, and the calculation is more in accordance with the actual application scene. The application also discloses a device for evaluating the radar cross section of the ship.
Description
Technical Field
The present application relates to the technical field of ship radars, for example, to a method and a device for evaluating a ship radar cross section.
Background
At present, a water surface ship is a complex platform integrating a plurality of functions, and in practical application, the ship is in close contact with the sea surface. Therefore, in evaluating the radar cross section of a ship, the scattering from the bulk of the ship has been objectively expanded to the composite scattering of the ship and the nearby sea surface. In the prior art, when analyzing the scattering cross section of a ship-sea composite radar, electromagnetic wave beam irradiation is usually considered to be arranged at the very far end or the very near end of the ship, the association relation between the electromagnetic wave beam and the sea surface in conduction is ignored, and the electromagnetic wave beam is regarded as a horizontal incident wave to calculate.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
at present, a method for improving the accuracy of the radar cross section of the ship on the sea in a large scale in the sea sweeping direction is not available.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.
The embodiment of the disclosure provides a method for improving the accuracy of the radar cross section of the ship on the sea with the large scale in the sea-sweeping direction, so that the calculation is more in line with the technical problem of the actual application scene.
In some embodiments, a method for evaluating a radar cross section of a ship comprises:
receiving electromagnetic wave beam information of a grazing sea incidence azimuth; preprocessing electromagnetic wave beams of the sea-sweeping incidence azimuth based on a sea surface model, and generating coupling wave beams after sea surface coupling; calculating ship electromagnetic scattering energy echo by taking the coupled wave beam as an incident wave; coupling the calculated ship electromagnetic scattering energy echo with the sea surface model to generate a ship scattering energy echo; and calculating a ship radar scattering cross section on the sea surface in the sea skimming azimuth by using the ship scattering energy echo.
In some embodiments, an apparatus for evaluating radar cross-section of a ship comprises: a processor and a memory storing program instructions, the processor being configured to perform the aforementioned method for ship stealth performance optimization when running the program instructions.
The method and the device for evaluating the radar cross section of the ship provided by the embodiment of the disclosure can realize the following technical effects:
and coupling processing is carried out according to the configuration information of the electromagnetic wave beam and a preset sea surface model to obtain a non-planar incident wave, so that the ship radar scattering characteristic under the irradiation of the non-planar incident wave is analyzed. The ship radar scattering cross section is obtained through analysis of the ship radar scattering characteristics, so that the accuracy of the ship radar scattering cross section on the sea surface with the large scale in the sea sweeping direction is improved, and the calculation is more in accordance with the actual application scene.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:
FIG. 1 is a schematic illustration of a method for evaluating radar cross-section of a ship provided by an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a method for generating coupled beams coupled via the sea surface based on a sea surface model, provided by an example of the present disclosure;
FIG. 3 is a schematic diagram of a method for preprocessing an electromagnetic beam to obtain a coupled beam after sea surface coupling according to an example of the present disclosure;
FIG. 4-1 is a schematic diagram of an antenna illuminating wave provided by an embodiment of the present disclosure;
FIG. 4-2 is a schematic illustration of a plane wave provided by an embodiment of the present disclosure;
FIGS. 4-3 are schematic diagrams of an antenna wave coupled from the sea surface provided by embodiments of the present disclosure;
FIG. 5 is a schematic diagram of a method for calculating echo of electromagnetic scattering energy of a ship provided by an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a method of generating ship's scattered energy echoes provided by embodiments of the present disclosure;
FIG. 7 is a schematic diagram of a method of calculating a radar cross section of a ship on a sea level at sea level in a sea level azimuth provided by an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of an apparatus for evaluating radar cross-section of a ship provided by an embodiment of the present disclosure;
Detailed Description
So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.
The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The term "plurality" means two or more, unless otherwise indicated.
In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.
Referring to fig. 1, an embodiment of the present disclosure provides a method for evaluating a radar cross section of a ship, including:
s01, receiving information of electromagnetic wave beams of sea grazing incidence azimuth.
S02, preprocessing electromagnetic wave beams of the sea-grazing incidence azimuth based on a sea surface model, and generating coupling wave beams after sea surface coupling.
S03, calculating ship electromagnetic scattering energy echo by taking the coupling wave beam as an incident wave.
And S04, coupling the calculated ship electromagnetic scattering energy echo with the sea surface model to generate the ship scattering energy echo.
S05, calculating a ship radar scattering cross section on the sea surface of the sea glancing azimuth by using the ship scattering energy echo.
By adopting the method for evaluating the scattering cross section of the ship radar provided by the embodiment of the disclosure, the non-planar incident wave can be obtained by coupling processing according to the configuration information of the electromagnetic wave beam and the preset sea surface model, and further the scattering characteristic of the ship radar under the irradiation of the non-planar incident wave is analyzed. And obtaining the scattering cross section of the ship radar through analyzing the scattering characteristics of the ship radar. Therefore, the accuracy of the radar cross section of the ship on the sea surface with the large scale in the sea sweeping direction is improved, and the calculation is more in line with the actual application scene.
Optionally, receiving the grazing incidence azimuth electromagnetic beam information includes receiving an electromagnetic beam F ann The height h of (θ, φ), the normal direction (θ, φ) and the distance l of the target.
Here, by receiving electromagnetic beam F ann The height h of the (theta, phi) and the distance l between the normal line direction (theta, phi) and the target can determine the irradiation angle of the electromagnetic beam through the included angle formed by the height of the electromagnetic beam and the normal line direction, and the normal line direction and the intersection point formed by the distance between the normal line direction and the target can be understood as the irradiation area of the beam corresponding to the normal line direction. The expected irradiation range of the electromagnetic wave beam can be effectively prejudged by determining the irradiation angle and the irradiation area, so that a mat is prepared for the subsequent pretreatment operation of the sea surface model.
Optionally, as shown in fig. 2, preprocessing the electromagnetic beam of the sea-skimming incident azimuth based on the sea surface model, and generating the coupled beam after sea surface coupling includes the steps of receiving the sea surface model in step S11; step S12, preprocessing the electromagnetic wave beam based on the sea surface model to obtain a coupled wave beam after sea surface coupling. The method has the advantages that the preset sea surface model is imported, the electromagnetic wave beam is preprocessed, and the coupling relation between the electromagnetic wave beam and the sea surface is taken into consideration, so that the calculation is more in line with the actual application scene, and the accuracy of calculation of the radar cross section of the ship on the sea surface in the sea sweeping direction is improved.
Optionally, receiving the sea surface model includes meshing the sea surface model to obtain a sea surface heave mesh bin S 1～N The sea surface relief grid elements may be trilateral or quadrilateral, where N is a positive integer.
Optionally, as shown in fig. 3, preprocessing the electromagnetic beam based on the sea surface model, and obtaining the coupled beam after sea surface coupling includes step S21, dividing the electromagnetic beam into direct components F by an irradiation angle of the electromagnetic beam ann1 And a non-direct component F ann2 The method comprises the steps of carrying out a first treatment on the surface of the Step S22, non-direct component F ann2 The sea surface model is reflected to obtain a secondaryReflection component F' ann2 The method comprises the steps of carrying out a first treatment on the surface of the Step S23, direct component F ann1 And a secondary reflection component F' ann2 Superposition to form coupled beam E in . The irradiation area of the electromagnetic wave beam and the sea surface fluctuation grid surface element in the preset sea surface model can be determined through the irradiation angle of the electromagnetic wave beam, so that the electromagnetic wave beam is divided into a direct component and a non-direct component. The non-direct component and the sea surface relief grid surface element are reflected to form a secondary reflection component. The secondary reflection component and the direct component are overlapped to form a coupling wave beam, and the coupling wave beam is used as a calculation standard, so that calculation is more in line with the actual application scene, and the accuracy of calculation of the radar cross section of the ship on the sea surface in the sea sweeping direction is improved.
Alternatively, the electromagnetic beam is divided into direct components F by the irradiation angle of the electromagnetic beam ann1 And a non-direct component F ann2 Comprises dividing an electromagnetic beam into direct components F which can be directly irradiated to a ship by determining the irradiation angle of the electromagnetic beam from the target distance through the height and normal direction of the electromagnetic beam ann1 And a non-direct component F impinging on the sea surface grid surface element ann2 。
Optionally, the non-direct component F ann2 Obtaining a secondary reflection component F 'after reflection by the sea surface model' ann2 The expression can be expressed by the following expression:
wherein S is i The i-th grid surface element is represented, the value range of i is 1 to N, and N is a positive integer.
Here, by irradiating the non-direct component F of the sea surface grid surface element ann2 And the secondary reflection component is formed by superposition of the reflection beams formed by the grid surface elements of each sea surface model subdivision.
Alternatively, the direct component F ann1 And a secondary reflection component F' ann2 Superposition to form coupled beam E in The expression can be expressed by the following expression:
E in ＝F ann1 +F′ ann2 。
here, by vector-superposing the direct component and the secondary reflected component, a non-planar incident wave coupled by the sea surface, i.e. a coupled beam E, is formed in 。
In practical application, the image of the electromagnetic beam is shown in fig. 4-1 without considering the coupling effect of the sea surface model; in the case of taking the electromagnetic beam as a plane incident wave into consideration for calculation, an image of the electromagnetic beam is shown in fig. 4-2; preprocessing the electromagnetic wave beam by the sea surface model to obtain a coupled wave beam after sea surface coupling, as shown in figures 4-3, namely a coupled wave beam E in 。
Optionally, as shown in fig. 5, calculating the ship electromagnetic scattering energy echo by using the coupled beam as an incident wave includes step S31, and meshing the ship three-dimensional model; s32, performing electromagnetic scattering simulation calculation on each grid surface element; step S33, according to the simulation calculation result, the reflection energy of all the surface elements under the irradiation of the non-planar incident wave is superimposed to form a ship electromagnetic scattering energy echo F ship (θ+π,π-φ)。
Optionally, meshing the three-dimensional model of the ship to obtain a grid surface element S 'of the surface of the ship' 1～N The grid surface elements of the ship surface can enable trilateral or quadrilateral.
Alternatively, the electromagnetic scattering simulation calculation for each mesh bin may be expressed by:
wherein dF ship (S′ i ) Representing electromagnetic scattering simulation values of the ith grid bin, wherein the value range of i is 1 to N, and N is a positive integer;is the normal vector of the non-point source, +.>For scattering electric field vector>For the incident field vector +.>Is a radiation direction vector>R is the incident direction vector 0 Is the center position of the bin, k is a constant, < >>
Here, radar cross-sections and coupling actions of each bin are calculated by subdividing the target surface into grid bins. When the irradiation wave is plane wave, all incident fieldsWhen the coupling effect with the sea surface model is considered, the weighting processing of the incidence length is required according to the field intensity distribution after the beam is coupled with the sea surface model. />For incident magnetic field vector, ">Is the incident direction vector, determined by the initial illumination beam. In beam sea surface coupling calculations, < >>And->The direction is the half power beamwidth pointing angle of the illuminating beam. In the calculation of the target reflection intensity, < >>And->The direction is 180+ beam half power beamwidth pointing angle.
Optionally, according to the simulation calculation result, the reflected energy of all the surface elements under the irradiation of the non-planar incident wave is superimposed to form a ship electromagnetic scattering energy echo F ship (θ+pi, pi-phi) can be expressed by the following expression:
F ship (θ+π,π-φ)＝∑ i＝1 E in (i)×dF ship (S′ i )，
wherein E is in (i) Represents the energy intensity of the ith grid cell under non-planar incident wave illumination.
Here, the incident wave energy of each grid cell is independently assigned based on the energy intensity at that location of the non-planar incident wave, and based on dF ship (S′ i ) And superposing the reflection energy of all the surface elements under the irradiation of the non-planar incident wave to form the ship electromagnetic scattering energy echo by the calculation result.
Optionally, as shown in fig. 6, performing coupling processing on the calculated ship electromagnetic scattering energy echo and the sea surface model to generate a ship scattering energy echo includes step S41, and acquiring an irradiation angle of the ship electromagnetic scattering energy echo; step S42, dividing electromagnetic scattering characteristics into direct components F by the irradiation angle of the ship electromagnetic scattering energy echo ship1 And a non-direct component F ship2 The method comprises the steps of carrying out a first treatment on the surface of the Step S43, non-direct component F ship2 Obtaining a secondary reflection component F 'after reflection by the sea surface model' ship2 The method comprises the steps of carrying out a first treatment on the surface of the Step S44, direct component F ship1 And a secondary reflection component F' ship2 Superposition to form ship scattering energy echo E ship Wherein E is ship Is a non-planar wave. The irradiation area of the ship electromagnetic scattering energy echo and the sea surface fluctuation grid surface element in the preset sea surface model can be determined through the irradiation angle of the ship electromagnetic scattering energy echo, so that the ship electromagnetic scattering energy echo is divided into a direct component and a non-direct component. The non-direct component and the sea surface relief grid surface element are reflected to form a secondary reflection component. The secondary reflection component and the direct reflection component are combinedThe components are overlapped to form a ship scattering energy echo, and the ship scattering energy echo is used as a calculation standard, so that calculation is more in line with an actual application scene, and the accuracy of calculation of the ship radar scattering cross section on the sea surface in the sea sweeping direction is improved.
Optionally, the irradiation angle of the ship electromagnetic scattering energy echo is determined by the height of the ship electromagnetic scattering energy echo and the distance between the normal direction and the target.
Optionally, the ship electromagnetic scattering energy echo is divided into direct components F by the irradiation angle of the ship electromagnetic scattering energy echo ship1 And a non-direct component F ship2 Comprises dividing ship electromagnetic scattering energy echo into direct components F which are not reflected by sea surface model ship1 And a non-direct component F impinging on the sea surface grid surface element ship2 。
Optionally, the non-direct component F ship2 Obtaining a secondary reflection component F 'after reflection by the sea surface model' ship2 The expression can be expressed by the following expression:
here, by irradiating the non-direct component F of the sea surface grid surface element ann2 And the secondary reflection component is formed by superposition of the reflection beams formed by the grid surface elements of each sea surface model subdivision.
Alternatively, the direct component F ship1 And a secondary reflection component F' ship2 Superposition to form ship scattering energy echo E ship The expression can be expressed by the following expression:
E ship ＝F ship1 +F′ Ship2 。
here, by vector-superposing the direct component and the secondary reflection component, a non-planar wave after sea-surface coupling, E, is formed iship 。
Optionally, as shown in fig. 7, calculating a ship radar cross section on the sea surface of the sea azimuth by using the ship scattering energy echo includes a step S51 of measuring an electromagnetic scattering energy echo of a preset calibration body of a known radar cross section value under the condition that the measuring environment is kept unchanged; and S52, calculating the radar cross section of the ship on the sea surface in the sea azimuth according to the measured value of the preset calibration body. Under the condition that the measuring environment is unchanged, electromagnetic scattering energy echoes of preset calibration bodies with known radar scattering section values are measured, the absolute value of the ratio between the electromagnetic scattering energy echoes of the ship and the electromagnetic scattering energy echoes of the calibration bodies is formed into a ratio relation through a relative calibration method, and the radar scattering section of the ship on the sea surface in the sea azimuth is calculated.
Optionally, measuring electromagnetic scattering energy echoes of the preset calibration volume of known radar cross-section values while maintaining the measurement environment unchanged includes measuring electromagnetic scattering energy echoes that take sea surface coupling effects into account or measuring electromagnetic scattering energy echoes that do not take sea surface coupling effects into account.
Alternatively, the calculation of the radar cross section of the ship on the sea surface of the sea azimuth can be expressed by the following expression according to the measured value of the preset calibration body:
wherein E is 0 Representing electromagnetic scattering energy echo, sigma of a preset calibration body 0 Representing radar scattering cross-section values of a predetermined calibration volume.
Here, the predetermined calibration body may be a sphere with a radius r, and the radar cross section of the predetermined calibration body may be known to pass through sigma 0 ＝πr 2 The expression is expressed.
As shown in connection with fig. 3, an embodiment of the present disclosure provides an apparatus for evaluating a radar cross section of a ship, including a processor (processor) 100 and a memory (memory) 101. Optionally, the apparatus may further comprise a communication interface (Communication Interface) 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via the bus 103. The communication interface 102 may be used for information transfer. Processor 100 may invoke logic instructions in memory 101 to perform the method of the above-described embodiments for evaluating radar cross-section of a ship.
Further, the logic instructions in the memory 101 described above may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand alone product.
The memory 101 is a computer readable storage medium that can be used to store a software program, a computer executable program, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. Processor 100 executes functional applications and data processing by running program instructions/modules stored in memory 101, i.e. implements the method for assessing radar cross section of a ship in the above described embodiments.
The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the terminal device, etc. Further, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.
The embodiment of the disclosure provides a product computer, which comprises the device for evaluating the radar cross section of a ship.
Embodiments of the present disclosure provide a computer readable storage medium storing computer executable instructions configured to perform the above-described method for evaluating a radar cross section of a ship.
The disclosed embodiments provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the above-described method for assessing radar cross section of a ship.
The computer readable storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.
Embodiments of the present disclosure may be embodied in a software product stored on a storage medium, including one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of a method according to embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium including: a plurality of media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or a transitory storage medium.
The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, when used in this application, the terms "comprises," "comprising," and/or "includes," and variations thereof, mean that the stated features, integers, steps, operations, elements, and/or components are present, but that the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.
Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. The skilled artisan may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units may be merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than that disclosed in the description, and sometimes no specific order exists between different operations or steps. For example, two consecutive operations or steps may actually be performed substantially in parallel, they may sometimes be performed in reverse order, which may be dependent on the functions involved. Each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (7)
1. A method for evaluating a radar cross section of a ship, comprising:
receiving electromagnetic wave beam information of a grazing sea incidence azimuth;
preprocessing electromagnetic wave beams of the sea-sweeping incidence azimuth based on a sea surface model, and generating coupling wave beams after sea surface coupling;
calculating ship electromagnetic scattering energy echo by taking the coupled wave beam as an incident wave;
coupling the calculated ship electromagnetic scattering energy echo with the sea surface model to generate a ship scattering energy echo;
calculating a ship radar scattering cross section on the sea surface in the sea skimming azimuth by using the ship scattering energy echo;
preprocessing an electromagnetic wave beam of a sea-swept incident azimuth based on a sea surface model to generate a coupled wave beam after sea surface coupling, wherein the method comprises the following steps:
receiving a sea surface model;
preprocessing an electromagnetic wave beam based on the sea surface model to obtain a coupled wave beam E after sea surface coupling in Wherein E is in Is a non-planar incident wave;
preprocessing an electromagnetic wave beam based on the sea surface model to obtain a coupled wave beam E after sea surface coupling in Comprising:
dividing the electromagnetic beam into direct components F by the irradiation angle of the electromagnetic beam ann1 And a non-direct component F ann2 ；
Non-direct component F ann2 Obtaining a secondary reflection component F 'after reflection by the sea surface model' ann2 ；
Will direct component F ann1 And a secondary reflection component F' ann2 Superposition to form coupled beam E in ；
Calculating ship electromagnetic scattering energy echo by taking the coupled wave beam as an incident wave, wherein the method comprises the following steps of:
meshing the ship three-dimensional model;
performing electromagnetic scattering simulation calculation on each grid surface element;
according to the simulation calculation result, the reflection energy of all the surface elements under the irradiation of non-planar incident wave is superimposed to form a ship electromagnetic scattering energy echo F ship (θ+π,π-φ)。
2. The method of claim 1 wherein the electromagnetic beam information of the grazing incidence azimuth comprises an electromagnetic beam F ann The height h of (θ, φ), the normal direction (θ, φ) and the distance l of the target.
3. The method according to claim 1, wherein the irradiation angle of the electromagnetic beam is determined based on the height h of the electromagnetic beam, the normal direction (θ, Φ) and the distance l from the target.
4. The method of claim 1, wherein performing electromagnetic scattering simulation calculations for each mesh bin comprises:
and (3) calculating:
wherein dF ship (S′ i ) Representing electromagnetic scattering simulation values of the ith grid bin, wherein the value range of i is 1 to N, and N is a positive integer;is the normal vector of the non-point source, +.>For scattering electric field vector>For the incident field vector +.>Is a radiation direction vector>R is the incident direction vector 0 Is the center position of the bin, k is a constant, < >>
5. The method of claim 1, wherein coupling the calculated ship electromagnetic scattering energy echo with the sea surface model generates a ship scattering energy echo, comprising:
acquiring an irradiation angle of a ship electromagnetic scattering energy echo;
dividing electromagnetic scattering characteristics into direct components F by irradiation angles of ship electromagnetic scattering energy echoes ship1 And; non-direct component F ship2 ；
Non-direct component F ship2 Obtaining a secondary reflection component F 'after reflection by the sea surface model' ship2 ；
Will direct component F ship1 And a secondary reflection component F' ship2 Superposition to form ship scattering energy echo E ship Wherein E is ship Is a non-planar wave.
6. The method of claim 5, wherein calculating a ship radar cross-section on a sea level at a sea level glancing orientation from the ship scattering energy echoes comprises:
under the condition of keeping the measuring environment unchanged, measuring electromagnetic scattering energy echoes of a preset calibration body with known radar scattering cross section values;
according to the measured value of the preset calibration body, calculating the radar cross section of the ship on the sea surface in the sea azimuth; and (3) calculating:
wherein E is 0 Representing electromagnetic scattering energy echo, sigma of a preset calibration body 0 Representing radar scattering cross-section values of a predetermined calibration volume.
7. An apparatus for assessing a radar cross section of a ship, comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for assessing a radar cross section of a ship of any one of claims 1 to 6 when the program instructions are run.
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