CN111208359A - Compact range reflecting surface side tooth and design method - Google Patents
Compact range reflecting surface side tooth and design method Download PDFInfo
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- CN111208359A CN111208359A CN202010081167.0A CN202010081167A CN111208359A CN 111208359 A CN111208359 A CN 111208359A CN 202010081167 A CN202010081167 A CN 202010081167A CN 111208359 A CN111208359 A CN 111208359A
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Abstract
The invention relates to a compact range reflector side tooth and a design method thereof, wherein the method comprises the following steps: determining the size and the working frequency of a quiet zone of a reflecting surface of a required compact range, and designing at least three reflecting surfaces with different types of side teeth; respectively simulating each reflecting surface, and respectively obtaining simulation data of amplitude and phase at the front, middle and rear positions of a quiet zone of each reflecting surface, so as to determine the reflecting surface with the best longitudinal consistency of the quiet zone and the reflecting surface with the best transverse consistency of the quiet zone in each reflecting surface; designing and optimizing the reflecting surface by combining the type of the side teeth of the reflecting surface with the best longitudinal consistency in the dead zone and the reflecting surface with the best transverse consistency in the dead zone, and determining each adjustable parameter of the side teeth; and respectively optimizing each adjustable parameter of the optimized reflecting surface side tooth to obtain a specific numerical value of the optimized reflecting surface side tooth. The invention can reduce the influence of the edge of the reflecting surface on the performance of the quiet zone and improve the accuracy of the electromagnetic property test of the target to be tested.
Description
Technical Field
The invention relates to the technical field of electromagnetic measurement, in particular to a compact range reflecting surface side tooth and a design method thereof.
Background
Since the six-seventies of the twentieth century, the compact field electromagnetic measurement technology gradually replaces the traditional far field measurement method by the advantages that the measurement is not influenced by weather and interference clutter, the required test field is small, the measurement consistency is good and the like, and becomes a main measurement means for electromagnetic characteristic parameters of various scatterers and radiators.
The core component of the compact range is the reflective surface. The surface type forms of the reflecting surfaces are usually different according to different numbers of the reflecting surfaces, a common single reflecting surface mainly adopts a single rotating paraboloid, and a common double reflecting surface mainly adopts a double parabolic cylinder. The types of the side teeth of the reflecting surface are various, and the mixed winding side teeth are developed from the initial common triangular side teeth to the present mixed winding side teeth.
At present, the most common reflecting surface tooth forms can be mainly divided into three types, including a right-angled triangle tooth, a cosine tooth and a corner straight tooth, as shown in fig. 1, fig. 1 is a schematic diagram of aperture surface projection of the three types of common tooth forms, fig. 1(a) shows the right-angled triangle tooth reflecting surface projection, fig. 1(b) shows the cosine tooth reflecting surface projection, and fig. 1(c) shows the corner straight tooth reflecting surface projection. The three common side teeth have advantages and disadvantages, wherein the research history of the side teeth of the right-angled triangle is the longest, the theoretical research is relatively deep, the processing and design difficulty is relatively low, but the performance of the dead zone depends on the optimization of the slope of the hypotenuse of the triangle, the hypotenuse has relative restriction relation, and an optimal scheme is difficult to find. Cosine side teeth are similar to right-angled triangle side teeth, the hypotenuse of a triangle is changed from a straight line to a cosine curve, stray field distribution of a quiet area introduced by the side teeth is adjusted by changing the order of the cosine curve, although the side teeth are novel in form, the performance of the final quiet area is not improved greatly. The degree of freedom that the straight side tooth of turning designed the side tooth further promotes, for right angled triangle side tooth, becomes the broken line form with right-angle side and hypotenuse simultaneously, can set up the position of corner point in a flexible way according to the distribution condition of side tooth diffraction field to reduce the influence of plane of reflection edge to quiet district's performance, but this type of side tooth present form is single, lacks flexibility and adaptability.
Disclosure of Invention
The invention aims to overcome at least part of defects, and provides a novel compact range reflector side tooth and a design method thereof, so as to reduce the influence of the reflector side edge on the performance of a dead zone.
In order to achieve the above object, the present invention provides a compact range reflector sidetooth design method, comprising the steps of:
s1, determining the size and the working frequency of a quiet zone of the reflecting surface of the required compact range, and designing at least three reflecting surfaces with different types of side teeth;
s2, simulating each reflecting surface respectively, and obtaining simulation data of amplitude and phase at the front, middle and rear positions of a quiet zone respectively, so as to determine the reflecting surface with the best longitudinal consistency and the reflecting surface with the best transverse consistency of the quiet zone in each reflecting surface;
s3, designing and optimizing the reflecting surface by combining the edge tooth type of the reflecting surface with the best longitudinal consistency in the dead zone and the reflecting surface with the best transverse consistency in the dead zone, and determining each adjustable parameter of the edge tooth;
and S4, optimizing each adjustable parameter of the optimized reflecting surface side tooth respectively to obtain a specific numerical value of the optimized reflecting surface side tooth.
Preferably, in step S1, the designed reflection surfaces include right-angled triangle-shaped tooth reflection surfaces, cosine-shaped tooth reflection surfaces, and corner straight-edged tooth reflection surfaces.
Preferably, in step S3, when designing the optimized reflective surface and determining each adjustable parameter of its edge teeth, the adjustable parameters include bottom edge width, apex distance, inflection point distance, and inflection point height.
Preferably, in the step S4, when the adjustable parameters of the optimized reflection surface side teeth are optimized, the widths of the bottom sides of the side teeth are arranged in an arithmetic series or an geometric series from the center to the outer side.
Preferably, when the adjustable parameters of the optimized reflecting surface side teeth are optimized in step S4, the distances between the tops of the side teeth are arranged in an arithmetic progression from the center to the outer side.
Preferably, when the adjustable parameters of the optimized reflection face tooth are optimized in step S4, the inflection point pitch of each tooth is a value to be optimized plus one half of the width of the bottom edge of the tooth.
Preferably, when the adjustable parameters of the optimized reflection surface side teeth are optimized in step S4, the inflection point heights of the side teeth are arranged in an arithmetic progression from the center to the outer side.
Preferably, in step S1, the designed size of the reflecting surface is in the range of 25 λ -30 λ, wherein the length of the side tooth is in the range of 3 λ -5 λ, and λ represents the wavelength of the electromagnetic wave corresponding to the lowest operating frequency.
The invention also provides a compact range reflecting surface side tooth which is obtained based on the compact range reflecting surface side tooth design method in any one of the above aspects.
The invention also provides a compact range reflecting surface, which is provided with the compact range reflecting surface side teeth.
The technical scheme of the invention has the following advantages: the compact range reflector side tooth design method provided by the invention can obtain a new side tooth through an optimized adjustment mode on the basis of the traditional common side tooth, thereby further reducing the influence of the reflector edge on the quiet zone performance and improving the accuracy of the electromagnetic characteristic test of the target to be tested.
Drawings
FIG. 1 is a schematic projection of three common side tooth form calibre surfaces;
FIG. 2 is a schematic illustration of the steps of a compact range reflector tooth design method in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of the composition of the reflecting surfaces and the parameters of the side teeth in the embodiment of the present invention;
FIG. 4 shows a central vertical sectional line of the quiet zone under 1GHz horizontal polarization of the reflecting surface in the embodiment of the invention;
FIG. 5 shows a central horizontal sectional line of a 10GHz vertically polarized lower dead zone of a reflecting surface in an embodiment of the invention.
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.
As shown in fig. 2 to 5, a compact range reflector sidetooth design method provided in an embodiment of the present invention includes the following steps:
s1, determining the size of the quiet zone and the working frequency of the reflecting surface in the required compact range, and designing at least three reflecting surfaces with different types of side teeth.
In step S1, the size and operating frequency of the dead zone are set according to actual requirements, and a plurality of reflecting surfaces with different types of edge teeth are designed according to the size and operating frequency of the desired dead zone by using a (conventional) method for designing edge teeth of reflecting surfaces in the prior art.
Preferably, when the reflecting surface is designed, the mouth surface size range of the designed reflecting surface (including the side teeth) is usually required to be 25 λ -30 λ, and the length range of the side teeth is required to be 3 λ -5 λ, and the fine adjustment can be specifically carried out according to the actual requirement, wherein λ represents the wavelength of the electromagnetic wave corresponding to the lowest working frequency.
Further, in step S1, the designed reflection surfaces include a right-angled triangle tooth reflection surface, a cosine tooth reflection surface, and a corner straight tooth reflection surface, that is, three reflection surfaces whose tooth types are a right-angled triangle tooth, a cosine tooth, and a corner straight tooth are obtained in sequence by using a conventional design method. As shown in fig. 1, the right-angled triangle tooth, the cosine tooth and the corner straight tooth are the most common three types of tooth in the prior art, and the present invention preferably obtains a new tooth by optimizing the adjustment design based on the three types of tooth. The traditional design method for the right-angled triangle side teeth, the cosine side teeth and the corner straight side teeth is relatively mature, the reflecting surface side teeth with the best performance can be directly obtained by utilizing the prior art, and specific contents such as the design process, parameter setting and the like are not repeated.
And S2, respectively simulating each reflecting surface, respectively obtaining simulation data of amplitude and phase at the front, middle and rear positions of a quiet zone, and further determining the reflecting surface with the best longitudinal consistency of the quiet zone and the reflecting surface with the best transverse consistency of the quiet zone in each reflecting surface.
In step S2, the same simulation method is used to sequentially simulate each reflection surface to consider the quiet zone performance of each reflection surface, the judgment positions of the quiet zone are front, middle and rear, and other positions may not be considered, so as to improve the calculation efficiency. In step S2, the simulation data of the amplitudes and phases of the front, middle, and rear positions of each reflection surface in the dead zone obtained in step S1 are compared, and the optimal adjustment direction of the new tooth expected to be obtained by the method is predicted by analyzing the influence of different types of teeth on the dead zone in a summary manner.
In a preferred embodiment, when the reflecting surfaces designed in step S1 are right-angled triangle side tooth reflecting surfaces, cosine side tooth reflecting surfaces and corner straight side tooth reflecting surfaces, the dead zone performance of the three reflecting surfaces is compared according to the obtained simulation data of amplitude and phase, and by combining the dead zone characteristics of the actual reflecting surfaces and further analyzing the influence rule of the side tooth, it is found that the consistency of the corner straight side tooth reflecting surfaces in the longitudinal forward, middle and backward positions of the dead zone is better than that of the other two reflecting surfaces, while the lateral consistency of the dead zone characteristics of the right-angled triangle side tooth reflecting surfaces is slightly better than that of the other reflecting surfaces, that is, the reflecting surface with the best dead zone longitudinal consistency among the reflecting surfaces is the corner straight side tooth reflecting surface, and the reflecting surface with the best dead zone lateral consistency is the right-angled triangle side tooth reflecting surface.
And S3, designing and optimizing the reflecting surface by combining the type of the edge teeth of the reflecting surface with the best longitudinal consistency of the dead zone and the reflecting surface with the best transverse consistency of the dead zone, and determining each adjustable parameter of the edge teeth.
In step S3, the types of the side teeth of the reflection surface with the best longitudinal consistency in the dead zone and the reflection surface with the best transverse consistency in the dead zone are comprehensively analyzed, the basic types of the side teeth of the optimized reflection surface are determined, and various parameters of the side teeth are further determined.
Preferably, when the reflecting surfaces designed in step S1 are right-angled triangle-shaped tooth reflecting surfaces, cosine-shaped tooth reflecting surfaces and corner straight-edged tooth reflecting surfaces, the reflecting surface with the best longitudinal consistency in the dead zone is the corner straight-edged tooth reflecting surface, and the reflecting surface with the best transverse consistency in the dead zone is the right-angled triangle-shaped tooth reflecting surface, the profile (i.e., the tooth area) of the optimized reflecting surface with the new edge tooth should be in the form of a combination of the corner straight-edged tooth and the right-angled triangle-shaped edge tooth.
Considering that on the premise of determining the length of the tooth, the adjustable parameter of the right-angled triangle tooth is only one of the base width, and the corner straight tooth has a plurality of adjustable parameters such as the base width, the apex distance, the inflection point interval, the inflection point height, and the like, preferably, in step S3, the optimized reflecting surface is designed, and when determining each adjustable parameter of the tooth, the reflecting surface with more adjustable parameter items and better design flexibility is selected as the basis to determine each adjustable parameter of the new tooth desired to be obtained, so as to perform further optimization, that is, the optimization is performed on the basis of the reflecting surface of the corner straight tooth, and the adjustable parameters include but are not limited to: the bottom edge width, the apex distance, the inflection point interval and the inflection point height of the side teeth.
Further, when the optimized reflecting surface is designed and the adjustable parameters of the tooth are determined in step S3, the outer shape of the new tooth that is desired to be obtained by the present invention can be adjusted by adding new adjustable parameter items, for example, the outer shape can be derived from four sides of a corner straight tooth into a multi-side shape, and each side can be allowed to have a straight line shape and can also adopt an arbitrary curve obtained based on a parameter equation.
And S4, optimizing each adjustable parameter of the optimized reflecting surface side tooth respectively to obtain a specific numerical value of the optimized reflecting surface side tooth.
This step S4 is to design the teeth of the optimized reflecting surface based on the current parameters, and based on the simulation results, optimize the parameter settings of the reflecting surface until finding the reflecting surface that meets the current requirements of the quiet zone size and the operating frequency. In the process of respectively optimizing and adjusting each adjustable parameter, only one parameter is adjusted each time, other parameters are kept unchanged for simulation, if the simulation effect is not ideal, the parameter is adjusted until the design requirement is met, then the parameter is kept, other parameters are continuously adjusted, and finally the compact range reflecting surface specific value meeting the specific environmental requirement is obtained.
According to the compact range reflector side tooth design method provided by the invention, on the premise of ensuring the complete consistency of the feed source irradiation condition, the dead zone observation position and the main reflection zone, theoretical simulation is taken as guidance, and the traditional reflector design method is used for reference, so that corner straight side teeth are optimized and adjusted, a new side tooth capable of further improving the performance of the dead zone and an optimized reflector adopting the new side tooth are obtained, the influence of the edge of the reflector on the performance of the dead zone can be effectively reduced, and the accuracy of the electromagnetic property test of a target to be tested is improved.
Preferably, in the step S4, when each adjustable parameter of the optimized reflection surface side teeth is optimized, the widths of the bottom sides of the side teeth are arranged in an arithmetic progression or an geometric progression from the center of the optimized reflection surface to the outer side. Different from the prior art, the widths of the bottom edges of the side teeth can be different, so that the flexibility and the adaptability of the side teeth of the reflecting surface are effectively improved.
Further, when the adjustable parameters of the optimized reflecting surface side teeth are optimized in step S4, the distances between the apexes of the side teeth are arranged in an arithmetic progression from the center of the optimized reflecting surface to the outside (for the reflecting surface whose projection is close to a square or a rectangle, that is, from the center to both sides of each side). The arrangement of the tip distance is further arranged according to the equal-difference series and the equal rule on the basis of the arranged width of the bottom edge, but the contact interference of adjacent edge teeth is avoided.
Further, when the adjustable parameters of the optimized reflection face tooth are optimized in step S4, the distance between inflection points of each tooth is equal to half the width of the bottom edge of the tooth, and the optimal value is set, and care should be taken to avoid the adjacent teeth from touching. During optimization, other parameters are fixed, and the specific value of the value to be optimized is adjusted and set according to the performance of the dead zone, so that the inflection point distance of each side tooth can be obtained.
Further, when the adjustable parameters of the optimized reflection surface tooth are optimized in step S4, the inflection point heights of the optimized reflection surface tooth are arranged in an arithmetic progression from the center of the optimized reflection surface to the outside. The inflection point height is mainly set from inside to outside according to the equal-difference series and the like rules on the basis of considering the overall surface shape size.
In summary, the optimized reflective surface with the new edge tooth can be optimized and adjusted on the basis of the conventional corner straight edge tooth, and the setting of the base width thereof can refer to the optimization process of the right-angled triangle edge tooth, which is not further described herein.
Figures 4 and 5 show the dead band performance curves of a reflecting surface with completely new toothing obtained by the method according to the invention in one embodiment, FIG. 4 is a diagram of a vertical cross-section of the center of a dead zone under 1GHz horizontal polarization, and FIG. 4(a) shows the amplitude of the main polarization of the vertical cross-section of the center of the dead zone in horizontal polarization, FIG. 4(b) shows the dominant polarization phase of the central vertical stub of the dead zone in the case of horizontal polarization, FIG. 4(c) shows the cross-polarization amplitude of the central vertical stub of the dead zone in the case of horizontal polarization, FIG. 5 is a diagram of the central horizontal cross-section of the dead zone under 10GHz vertical polarization, and FIG. 5(a) shows the amplitude of the main polarization of the central horizontal cross-section of the dead zone in vertical polarization, FIG. 5(b) shows the phase of the main polarization of the central horizontal sectional line of the quiet zone in the case of vertical polarization, and FIG. 5(c) shows the amplitude of the cross polarization of the central horizontal sectional line of the quiet zone in the case of vertical polarization. The size of a dead zone of the reflecting surface is 2m, the working frequency is 1-40 GHz, the performance of the reflecting surface is superior to that of the similar reflecting surface, and the effectiveness of the compact range reflecting surface side tooth design method provided by the invention is verified.
The invention also provides a compact range reflector side tooth, which is obtained by the following steps of:
s1, determining the size and the working frequency of a quiet zone of the reflecting surface of the required compact range, and designing at least three reflecting surfaces with different types of side teeth;
s2, simulating each reflecting surface respectively, and obtaining simulation data of amplitude and phase at the front, middle and rear positions of a quiet zone respectively, so as to determine the reflecting surface with the best longitudinal consistency and the reflecting surface with the best transverse consistency of the quiet zone in each reflecting surface;
s3, designing and optimizing the reflecting surface by combining the edge tooth type of the reflecting surface with the best longitudinal consistency in the dead zone and the reflecting surface with the best transverse consistency in the dead zone, and determining each adjustable parameter of the edge tooth;
and S4, optimizing each adjustable parameter of the optimized reflecting surface side tooth respectively to obtain a specific numerical value of the optimized reflecting surface side tooth.
In some preferred embodiments, the toothing may also be obtained based on the compact range reflector toothing design method described in any of the above embodiments, and a description thereof will not be repeated.
The invention is based on the traditional side tooth design method, and finally obtains a brand new side tooth different from the traditional reflecting surface side tooth by a theoretical simulation analysis and adjustment optimization iterative mode, thereby reducing the influence of the reflecting surface edge on the quiet zone performance.
The invention also provides a compact range reflecting surface which is provided with the compact range reflecting surface side tooth. Compared with the traditional side tooth reflecting surface, the reflecting surface side tooth has great flexibility in design, simulation designers can flexibly adjust the size and the appearance of the side tooth according to actual darkroom environmental conditions and test requirements, and meanwhile, the longitudinal consistency and the transverse stability of the quiet zone performance of the reflecting surface side tooth are far superior to those of the traditional side tooth reflecting surface.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A compact range reflecting surface side tooth design method is characterized by comprising the following steps:
s1, determining the size and the working frequency of a quiet zone of the reflecting surface of the required compact range, and designing at least three reflecting surfaces with different types of side teeth;
s2, simulating each reflecting surface respectively, and obtaining simulation data of amplitude and phase at the front, middle and rear positions of a quiet zone respectively, so as to determine the reflecting surface with the best longitudinal consistency and the reflecting surface with the best transverse consistency of the quiet zone in each reflecting surface;
s3, designing and optimizing the reflecting surface by combining the edge tooth type of the reflecting surface with the best longitudinal consistency in the dead zone and the reflecting surface with the best transverse consistency in the dead zone, and determining each adjustable parameter of the edge tooth;
and S4, optimizing each adjustable parameter of the optimized reflecting surface side tooth respectively to obtain a specific numerical value of the optimized reflecting surface side tooth.
2. The method of claim 1, wherein:
in step S1, the designed reflection surfaces include a right-angled triangle tooth reflection surface, a cosine tooth reflection surface, and a corner straight tooth reflection surface.
3. The method of claim 2, wherein:
in the step S3, when the optimized reflecting surface is designed and each adjustable parameter of the tooth of the reflecting surface is determined, the adjustable parameter includes a bottom edge width, a vertex distance, an inflection point interval, and an inflection point height.
4. The method of claim 3, wherein:
when the adjustable parameters of the optimized reflecting surface side teeth are optimized in step S4, the widths of the bottom sides of the side teeth are arranged in an arithmetic series or an geometric series from the center to the outer side.
5. The method of claim 4, wherein:
when the adjustable parameters of the optimized reflecting surface side teeth are optimized in the step S4, the distances between the apexes of the side teeth are arranged in an arithmetic progression from the center to the outer side.
6. The method of claim 5, wherein:
when the adjustable parameters of the optimized reflection face tooth are respectively optimized in the step S4, the distance between inflection points of each tooth is a value to be optimized plus one half of the width of the bottom edge of the tooth.
7. The method of claim 6, wherein:
when the adjustable parameters of the optimized reflection surface side teeth are optimized in step S4, the inflection point heights of the side teeth are arranged in an arithmetic progression from the center to the outer side.
8. The method of claim 1, wherein:
in step S1, the designed size range of the aperture surface of the reflection surface is 25 λ -30 λ, wherein the range of the tooth length is 3 λ -5 λ, and λ represents the wavelength of the electromagnetic wave corresponding to the lowest operating frequency.
9. A compact range reflector side tooth is characterized in that: obtained on the basis of the compact range reflector sidetooth design method as claimed in any one of claims 1 to 8.
10. A compact range reflector, comprising: with a compact range reflector toothing as claimed in claim 9.
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