Bistatic scattering regulation and control structure and design method thereof

Abstract

The invention provides a bistatic scattering regulation and control structure and a design method thereof, the bistatic scattering regulation and control structure is composed of a part of cambered surfaces in a metal spherical surface, and a radar scattering cross section in a wide angular domain detected by a bistatic radar is regulated and controlled by jointly adjusting size parameters and attitude parameters of the part of cambered surfaces. According to the scheme, the magnitude of the radar scattering cross section detected by the double-station radar can be regulated and controlled by adjusting the radius of the metal ball corresponding to the part of the cambered surface, and the scattering angle domain can be regulated and controlled by adjusting the azimuth angle and the pitch angle of the geometric center of the part of the cambered surface and the central angle corresponding to the azimuth direction and the pitch direction. Therefore, flexible regulation and control of the scattering characteristics of the bistatic radar can be realized, and the method has the characteristics of broadband, wide angular domain, polarization insensitivity and the like, and has important engineering application value.

Description

Technical Field

[0001] The present invention relates to the technical field of scattering control structures, and in particular to a bistatic scattering control structure and a design method thereof. Background Art

[0002] For the performance verification test of dual (multi) base radar detection, the lack of a wide-angle, flexible, adjustable, and easy-to-use dual-station scattering structure restricts the performance verification of dual (multi) base radar detection.

[0003] In the related technology, the scattering structure cannot meet the strong scattering contribution within a certain coverage angle range under a specific dual-station angle range, and thus cannot support the research and development test of dual-station radar detection.

[0004] Based on this, there is an urgent need for a method to implement a wide-angle bistatic scattering control structure to meet the flexible control of bistatic scattering characteristics and thus solve the experimental verification of bistatic detection radar. Summary of the invention

[0005] The embodiment of the present invention provides a bistatic scattering control structure and a design method thereof, which can realize flexible control of bistatic radar detection scattering characteristics.

[0006] In a first aspect, an embodiment of the present invention provides a dual-station scattering control structure and a design method thereof, wherein the dual-station scattering control structure is composed of a partial arc surface in a metal sphere, and the shape of the projection from the center of the partial arc surface to the center of the metal spherical surface is a rectangle. By jointly adjusting the size parameters and attitude parameters of the partial arc surface, the radar scattering cross-section magnitude and scattering angle range of dual-station radar detection are controlled.

[0007] In a possible design, the size parameter of the partial curved surface includes the radius of a metal sphere corresponding to the partial curved surface, and the radar cross section magnitude of the dual-station radar detection is regulated by adjusting the radius of the metal sphere.

[0008] In a possible design, the attitude parameters of the partial arc surface include the azimuth angle, pitch angle, and center angle corresponding to the azimuth and pitch directions of the geometric center of the metal sphere corresponding to the partial arc surface. The scattering angle domain is controlled by adjusting the azimuth angle, pitch angle, and center angle corresponding to the azimuth and pitch directions of the geometric center of the partial arc surface.

[0009] In a second aspect, an embodiment of the present invention further provides a method for designing a bistatic scattering control structure according to any one of the first aspects above, the design method comprising:

[0010] (1) Determining the radar cross section magnitude and target scattering angle range detected by the dual-station radar;

[0011] (2) calculating the size parameters of the bistatic scattering control structure according to the target radar scattering cross section using electromagnetic scattering theory;

[0012] (3) determining the attitude parameters of the bistatic scattering control structure using the principle of specular reflection according to the target scattering angle range;

[0013] (4) The bistatic scattering control structure is simulated based on the size parameters and attitude parameters of the partial arc surface, and the size parameters and attitude parameters are optimized and adjusted based on the simulation results until the preset accuracy is met, so as to complete the design of the bistatic scattering control structure.

[0014] In one possible design, the electromagnetic scattering theory formula is as follows:

[0015] σ=10×log(πR 2 )

[0016] Wherein, R is the radius of the metal sphere corresponding to the partial curved surface, and σ is the value of the radar cross section.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] In the present invention, a part of the arc surface in the metal spherical surface is used as a bistatic scattering control structure, and the size parameters and attitude parameters of the part of the arc surface structure jointly determine the parameter range of the radar scattering cross section detected by the bistatic radar. Specifically, the magnitude of the radar scattering cross section detected by the bistatic radar can be controlled by adjusting the radius of the metal sphere corresponding to the part of the arc surface, and the azimuth angle, elevation angle and the center angle corresponding to the azimuth and elevation directions of the geometric center of the part of the arc surface can be adjusted to control the scattering angle domain of the bistatic radar detection. In this way, the scattering characteristics of the bistatic radar can be flexibly controlled, and the bistatic radar has the characteristics of broadband, wide angular range, polarization insensitivity, etc., and has important engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a structural schematic diagram of a bistatic scattering control structure provided by an embodiment of the present invention;

[0021] Figure 2 It is a flow chart of a design method of a bistatic scattering control structure provided by an embodiment of the present invention;

[0022] Figure 3 is a planar geometric schematic diagram of a bistatic scattering control structure provided by an embodiment of the present invention;

[0023] Figures 4 to 8 is an RCS spatial distribution diagram of dual-station radar detection provided by an embodiment of the present invention; wherein, Figure 4 The incident azimuth angle is 20° and the elevation angle is 88°; Figure 5 The incident azimuth angle is 10° and the elevation angle is 88°; Figure 6 The incident azimuth angle is 10° and the elevation angle is 88.4°; Figure 7 The incident azimuth angle is 7° and the elevation angle is 88.7°; Figure 8 The incident azimuth angle is 5° and the elevation angle is 88.8°. DETAILED DESCRIPTION

[0024] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] like Figure 1 As shown, an embodiment of the present invention provides a bistatic scattering control structure, which is composed of a partial arc surface in a metal sphere, and the shape of the projection from the center of the partial arc surface to the center of the metal spherical surface is a rectangle. By jointly adjusting the size parameters and attitude parameters of the partial arc surface, the radar cross section (RCS) magnitude and scattering angle range of the bistatic radar detection are controlled.

[0026] The structure for realizing wide-angle dual-station scattering control in the embodiment of the present invention is composed of a portion of the arc surface of a metal sphere, which is an electrically large-size structure with a smooth surface, and serves as a flexible and adjustable electromagnetic scattering control component; the radius of the metal sphere corresponding to the portion of the arc surface, the azimuth and elevation angles of the geometric center of the portion of the arc surface, and the center angle corresponding to the azimuth and elevation directions determine its control performance.

[0027] In some embodiments, the size parameter of the partial curved surface includes the radius of a metal sphere corresponding to the partial curved surface, and the radar cross section magnitude of the dual-station radar detection is regulated by adjusting the radius of the metal sphere.

[0028] In some embodiments, the attitude parameters of the partial arc surface include the azimuth angle, pitch angle, and center angle corresponding to the azimuth and pitch directions of the geometric center of the metal sphere corresponding to the partial arc surface. The scattering angle domain detected by the dual-station radar is regulated by adjusting the azimuth angle, pitch angle, and center angle corresponding to the azimuth and pitch directions of the geometric center of the partial arc surface.

[0029] In the embodiment of the present invention, Figure 1 As shown, by using a part of the arc surface in the metal sphere as a bistatic scattering control structure, the size parameters and attitude parameters of the part of the arc surface structure jointly determine the parameter range of the RCS detected by the bistatic radar. Specifically, the RCS magnitude detected by the bistatic radar can be controlled by adjusting the radius of the metal sphere, and the azimuth angle, elevation angle and the center angle corresponding to the azimuth and elevation directions of the geometric center of the part of the arc surface can be adjusted to control the scattering angle domain detected by the bistatic radar. In this way, the scattering characteristics of the bistatic radar can be flexibly controlled, and the bistatic radar has the characteristics of broadband, wide angular range, polarization insensitivity, etc., and has important engineering application value.

[0030] like Figure 2 As shown, an embodiment of the present invention further provides a design method of a bistatic scattering control structure as described in any one of the above items, the design method comprising:

[0031] (1) Determining the radar cross section magnitude and target scattering angle range detected by the dual-station radar;

[0032] (2) calculating the size parameters of the bistatic scattering control structure according to the target radar scattering cross section using electromagnetic scattering theory;

[0033] (3) determining the attitude parameters of the bistatic scattering control structure using the principle of specular reflection according to the target scattering angle range;

[0034] (4) The bistatic scattering control structure is simulated based on the size parameters and attitude parameters of the partial arc surface, and the size parameters and attitude parameters are adjusted based on the simulation results until the preset accuracy is met, so as to complete the design of the bistatic scattering control structure.

[0035] In the embodiment of the present invention, for example, the RCS of the dual-station radar detection is designed to be 21 dBsm. Then, according to the electromagnetic scattering theory, the scattering intensity of the metal ball is related to the radius of the ball. Therefore, according to the electromagnetic scattering theory formula:

[0036] σ=10×log(πR 2 )

[0037] Wherein, R is the metal sphere corresponding to the partial arc surface, and σ is the value of the radar cross section; the RCS detected by the dual-station radar can be calculated, and the radius R of the metal sphere can be determined to be 6.6m, and the corresponding RCS value is calculated to be about 21.36dBsm, which meets the design conditions. Since the curvatures of the spherical surfaces in the metal sphere are equal everywhere, the scattering intensity of the partial arc surface in the metal sphere fluctuates less within a certain angular range and is relatively flat in distribution. Therefore, the radius R of the metal sphere corresponding to the partial arc surface can also be determined to be 6.6m.

[0038] In an embodiment of the present invention, the scattering angle domain position of the dual-station radar detection can be controlled by adjusting the partial arc surface attitude parameters. Combined with the principle of mirror reflection, the incident angle is equal to the reflection angle. According to design requirements, for example, the incident azimuth and the reflection azimuth can be designed to be equal, so the azimuth angle of the geometric center of the structure is set to 0°; at the same time, if the incident pitch angle domain is designed to be 88°-90° and the reflection pitch angle domain is designed to be 50°-80°, the pitch angle of the geometric center of the partial arc surface structure can be determined to be 77.5°.

[0039] Furthermore, the central angle corresponding to the azimuth and elevation directions can be determined according to the azimuth and elevation angles of the geometric center of the arc surface. By mapping the arc surface structure to a two-dimensional space, the geometric relationship between the incident and reflection angles and the central angle of the sector can be analyzed according to the two-dimensional space, such as Figure 3 As shown, it can be deduced that:

[0040] α2-α1=2θ

[0041] Among them, α1 and α2 are the angles of boundary incidence and reflection, θ is the central angle of the sector, and the incident directions are the same, so the angle difference between α2 and α1 is the size of the scattering angle domain. For example, the maximum size of the designed azimuth angle domain is 20°, and the maximum size of the elevation angle domain is 30°. Therefore, the central angle of the azimuth of the partial arc surface can be set to 12°, and its arc length is about 1.4m, and the central angle of the elevation direction can be set to 25°, and its arc length is about 2.9m.

[0042] Through the above design, the specific size and posture of the bistatic scattering control structure (partial curved surface) can be designed. In order to verify the electromagnetic scattering control performance of the bistatic scattering control structure, the RCS spatial distribution of the bistatic radar detection controlled by the above structure under different incident conditions is simulated and verified in the embodiment of the present invention. The simulation results are as follows: Figures 4 to 8 As shown in , combined with the simulation calculation results in Table 1, it can be seen that the spatial distribution of RCS detected by the dual-station radar meets the requirements of a wide angle range and can cover the expected angular range (the elevation angle range is 50°-80°, and the maximum azimuth angle range is ±10° of the symmetric angle of the incident azimuth), and the fluctuation of RCS is small and the distribution is relatively flat.

[0043] As shown in Table 1, the average RCS detected by the dual-station radar within the expected angular range is 21-22 dBsm, which is close to the theoretical calculation results and meets the design requirements. It can be seen that the arc surface structure designed in the embodiment of the present invention can meet different scattering control requirements under wide angular range by flexibly adjusting the size parameters and attitude parameters of the structure.

[0044] Table 1 RCS mean values ​​in specific angular domains under different incidence conditions

[0045]

[0046]

[0047] In summary, the partial curved surface structure with adjustable posture and size parameters proposed in the embodiment of the present invention can realize dual-station electromagnetic scattering control in a wide-angle range, and the design of the structure can be flexibly adjusted according to the dual-station radar detection indicators. Its specific parameters are determined by analyzing the incident and reflection angle domains, and then modeling and simulation calculation verification are carried out, and the curved surface structure can be corrected according to the results.

[0048] It should be understood that the above general description and the detailed description below are only exemplary and explanatory and cannot limit the present application. In the present application, the term "multiple" refers to two or more, unless otherwise expressly defined. In the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0049] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bistatic scattering control structure, characterized in that: The bistatic scattering control structure is composed of a partial arc surface in a metal sphere, and the shape of the projection from the center of the partial arc surface to the center of the metal sphere is a rectangle. The radar scattering cross-section magnitude and scattering angle range of bistatic radar detection are controlled by jointly adjusting the size parameters and attitude parameters of the partial arc surface.

2. The bistatic scattering control structure according to claim 1, characterized in that: The size parameters of the partial arc surface include the radius of the metal ball corresponding to the partial arc surface, and the radar cross section magnitude of the dual-station radar detection is regulated by adjusting the radius of the metal ball.

3. The bistatic scattering control structure according to claim 1, characterized in that: The attitude parameters of the partial arc surface include the azimuth angle, the pitch angle and the center angle corresponding to the azimuth and pitch directions of the geometric center of the partial arc surface. The scattering angle domain is regulated by adjusting the azimuth angle, the pitch angle and the center angle corresponding to the azimuth and pitch directions of the geometric center of the partial arc surface.

4. A method for designing a bistatic scattering control structure according to any one of claims 1 to 3, characterized in that: include: (1) determining the target radar cross section magnitude and target scattering angle range detected by the dual-station radar; (2) calculating the size parameters of the bistatic scattering control structure according to the target radar scattering cross section using electromagnetic scattering theory; (3) determining the attitude parameters of the bistatic scattering control structure using the principle of specular reflection according to the target scattering angle range; (4) The bistatic scattering control structure is simulated based on the size parameters and attitude parameters of the partial arc surface, and the size parameters and attitude parameters are optimized and adjusted based on the simulation results until the preset accuracy is met, so as to complete the design of the bistatic scattering control structure.

5. The design method according to claim 4, characterized in that: The electromagnetic scattering theory formula is as follows: σ=10×log(πR 2 ) Wherein, R is the radius of the metal sphere corresponding to the partial curved surface, and σ is the value of the radar cross section.

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