Design method for changing frequency dependence of traditional corner reflector

Abstract

The invention relates to a design method for changing frequency dependence of a traditional corner reflector, which relates to the field of corner reflectors, and comprises the following steps: redesigning an original corner reflector with three mutually vertical surfaces into a non-mutually vertical structure, carrying out simulation calculation to obtain RCS of the corner reflector at different deflection angles and different frequency points, and calculating an RCS mean value; the method comprises the following steps: analyzing the RCS mean value change under the relation between the deflection angle and different frequencies, and fitting the change relation of the RCS mean value change of the corner reflector along with the deflection angle and the frequencies by adopting a third-order polynomial, so as to obtain the structural data of different corner reflectors according to different frequencies. The method has the advantages that the frequency dependence of a traditional corner reflector can be changed, a novel simulation unit is provided for more truly and accurately simulating a real target, and technical support is provided for boundary exploration of simulation effect by simulation unit machining precision by analyzing different state RCS characteristics of the corner reflector.

Description

Technical Field

[0001] The present invention relates to the technical field of corner reflectors, and in particular to a design method for changing the frequency dependence of a traditional corner reflector. Background Art

[0002] A trihedral corner reflector, composed of three vertical panels, is often used as a simulated radar target due to its high backscatter radar cross section (RCS) over a wide angle range. However, trihedral corner reflectors are subject to machining errors during production, significantly affecting RCS performance, and their machining accuracy directly impacts the simulation results. Furthermore, the magnitude of these traditional corner reflectors is inversely proportional to the square of the wavelength, resulting in significant differences from real targets.

[0003] Therefore, in view of the above shortcomings, it is necessary to provide a design method for changing the frequency dependence of the traditional corner reflector. Summary of the Invention

[0004] (1) Technical issues to be solved

[0005] The technical problem to be solved by the present invention is to resolve the limitation of conventional corner reflectors that the magnitude increases in a quadratic relationship with increasing frequency.

[0006] (2) Technical solution

[0007] In order to solve the above technical problems, the present invention provides a design method for changing the frequency dependence of a traditional corner reflector, comprising the following steps:

[0008] Ⅰ. The original three-sided corner reflector is redesigned into a non-perpendicular structure, where the angle between the two sides of the new corner reflector and the two corresponding sides of the original corner reflector is t;

[0009] II. Place the new corner reflector horizontally and simulate its RCS scattering characteristics to obtain the RCS at different deflection angles and frequencies. Statistically analyze the RCS within the aperture and calculate the mean RCS.

[0010] III. By analyzing the change in the mean RCS of the corner reflector with a new structure under the relationship between the deflection angle of the two surfaces and different frequencies, a third-order polynomial is used to fit the relationship between the change in the mean RCS of the corner reflector and the change in deflection angle and frequency, so as to obtain the structural data of different corner reflectors according to different frequencies.

[0011] As a further illustration of the present invention, preferably, the two deflection surfaces of the corner reflector are two vertical surfaces.

[0012] As a further illustration of the present invention, preferably, the deflection angle is an acute angle.

[0013] As a further illustration of the present invention, preferably, the polynomial fitting result is:

[0014] f(t,x)=17+44.15t+2.1x-28.39t 2 -3.51x 2 +4.4t 3 +0.93t 2 x

[0015] in,

[0016] t is the deflection angle of the vertical plate of the corner reflector;

[0017] x is the frequency point.

[0018] (3) Beneficial effects

[0019] The above technical solution of the present invention has the following advantages:

[0020] The new design method for corner reflectors provided by the present invention can change the limitation of traditional corner reflectors that the magnitude increases in a square relationship with the wavelength, and provides a new simulation unit for more realistic and accurate simulation of real targets; there are certain errors in the processing and manufacturing of corner reflectors, which have a certain impact on RCS performance. The scattering characteristics of different deflection angles can reflect the scattering characteristics of different processing errors, providing technical support for exploring the boundaries of the simulation unit processing accuracy on the simulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 1 is a schematic structural diagram of a corner reflector of the present invention;

[0022] Figure 2 This is a graph showing how the mean RCS of a traditional corner reflector changes with frequency;

[0023] Figure 3 This is a graph showing how the mean RCS value changes with frequency when the present invention is tilted 0.2°;

[0024] Figure 4 This is a graph showing how the mean RCS value changes with frequency when the present invention is tilted 0.5°;

[0025] Figure 5 This is a graph showing how the mean RCS value changes with frequency when the present invention is tilted 0.6°;

[0026] Figure 6 This is a graph showing how the mean RCS value changes with frequency when the present invention is tilted 0.7°;

[0027] Figure 7 This is a graph showing how the mean RCS value changes with frequency when the present invention is tilted 0.8°;

[0028] Figure 8This is a graph showing how the mean RCS changes with frequency when the present invention is tilted 0.9°.

[0029] Figure 9 This is a graph showing how the mean RCS value changes with frequency when the present invention is tilted 1.0°;

[0030] Figure 10 This is a graph showing how the mean RCS changes with frequency when the present invention is tilted 1.2°;

[0031] Figure 11 This is a graph showing the fitting results of the corner reflector RCS mean, tilt degree, and frequency. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0033] A design method to change the frequency dependence of traditional corner reflectors, such as Figure 1 As shown, the following steps are included:

[0034] I. The original three-sided corner reflector was redesigned into a non-perpendicular structure, with the base plate defined as OAB and the vertical plates as OAD and OBD. The angle t between the two faces of the new corner reflector and the corresponding two faces of the original corner reflector is acute.

[0035] Ⅱ. Place the corner reflector of the new structure horizontally. To verify the difference in RCS scattering characteristics under different tilt states of the vertical plate, different tilt angles are designed, namely 0.2°, 0.5°, 0.6°, 0.7°, 0.8°, 0.9°, 1.0°, 1.2°, 1.4° and 1.6°. Electromagnetic theoretical simulation is performed on the corner reflector under different tilt angles. To verify the change of this type of corner reflector with frequency, the simulation frequency is set to 10GHz to 35GHz. The RCS characteristic value in the aperture is obtained through simulation calculation, and the RCS mean value is statistically calculated. The results are as follows Figures 2 to 10 shown.

[0036] From the curve of the change of the RCS mean value of the corner reflector with frequency at different tilt angles, it can be seen that the RCS of the traditional three-sided corner reflector increases with the increase of frequency, while the RCS mean value of the corner reflector designed by the present invention gradually decreases with the increase of frequency. When the tilt angle becomes larger, this trend is more obvious, and the RCS magnitude is weaker in the high frequency band.

[0037] III. By analyzing the change in the mean RCS value of the new corner reflector under the relationship between the deflection angle of the two surfaces and different frequencies, a third-order polynomial is used to fit the relationship between the change in the mean RCS value of the corner reflector and the change in the deflection angle and frequency, so as to obtain the structural data of different corner reflectors according to different frequencies. The polynomial fitting results are:

[0038] f(t,x)=17+44.15t+2.1x-28.39t 2 -3.51x 2 +4.4t 3 +

[0039] 0.93t 2 x.

[0040] in,

[0041] t is the deflection angle of the vertical plate of the corner reflector;

[0042] x is the frequency point.

[0043] The fitting results are as follows Figure 11 As shown, the present invention can change the frequency dependence of the traditional corner reflector, providing a new simulation unit for more realistic and accurate simulation of real targets; and by analyzing its RCS characteristics in different states, providing technical support for exploring the boundaries of the simulation unit processing accuracy on the simulation effect.

[0044] 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 various embodiments of the present invention.

Claims

1. A design method for changing the frequency dependence of a conventional corner reflector, characterized in that: The following steps are involved: Ⅰ. The original three-sided corner reflector is redesigned into a non-perpendicular structure, wherein the angle between the two sides of the new corner reflector and the two corresponding sides of the original corner reflector is t; II. Place the new corner reflector horizontally, simulate and calculate its RCS scattering characteristics, obtain the RCS of the corner reflector at different deflection angles and different frequencies, count the RCS within the mouth surface and calculate the RCS mean; III. By analyzing the change of RCS mean value under the relationship between the deflection angle of the two surfaces of the new structure corner reflector and different frequencies, the third-order polynomial is used to fit the relationship between the change of RCS mean value of the corner reflector with the deflection angle and frequency, so as to obtain the structural data of different corner reflectors according to different frequencies.

2. The design method for changing the frequency dependence of a conventional corner reflector according to claim 1, characterized in that: The two deflection surfaces of the corner reflector are two vertical surfaces.

3. The design method for changing the frequency dependence of a conventional corner reflector according to claim 2, characterized in that: The deflection angle is an acute angle.

4. The design method for changing the frequency dependence of a conventional corner reflector according to claim 3, characterized in that: The polynomial fitting result is: f(t,x)=17+44.15t+2.1x-28.39t 2 -3.51x 2 +4.4t 3 +0.93t 2 x in, t is the deflection angle of the vertical plate of the corner reflector; x is the frequency point.

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