Method, device and equipment for measuring electrical performance of antenna housing

Abstract

The invention provides a method, a device and equipment for measuring the electrical performance of an antenna housing. The method comprises the following steps: acquiring a preset turntable angle, and acquiring an initial near-field information value penetrating through a to-be-tested antenna housing based on a receiving antenna in the antenna housing system; the antenna housing system comprises a three-axis degree-of-freedom antenna turntable, a receiving antenna, a transmitting antenna and a to-be-tested antenna housing. The to-be-tested antenna housing and the receiving antenna are fixed on the three-axis degree-of-freedom antenna turntable through a clamping structure; performing compensation processing on the preset turntable angle based on an antenna housing system to obtain a far-field space angle; performing frequency spectrum conversion processing on the initial near-field information value by using a preset turntable angle to obtain a conversion result; obtaining a radiation field value of the to-be-measured antenna housing through the conversion result, the far-field space angle and a preset radiation characteristic compensation model; the preset radiation characteristic compensation model is obtained based on difference fitting of the ideal radiation field value and the test radiation field value; and taking the radiation field value as an electrical performance measurement result of the to-be-measured antenna housing.

Description

Technical Field

[0001] The present invention relates to the technical field of antenna data processing, and in particular to a method, device and equipment for measuring the electrical performance of a radome. Background Art

[0002] The radome electrical performance measurement method is an important means to detect whether the electrical performance of the radome sample meets the design indicators. It helps to ensure that the communication quality of the antenna system in actual applications is not affected by negative environmental factors. At the same time, according to the radome electrical performance measurement results, the impact of the radome on the antenna performance can be minimized, thereby ensuring the effectiveness of the antenna performance.

[0003] Most of the existing electrical performance measurements of radomes are based on a large, six-axis rotation clamping device and a large darkroom measurement system with a far-field distance. However, the devices included in the measurement system have problems such as long design and processing cycles and high costs, making them difficult to apply to general small and medium-sized darkrooms. Another effective measurement method is to directly fix a radome fixture on a three-axis freedom antenna turntable. The advantages of this method are that it is light in size and easy to install. However, this measurement method has the problem that the rotation centers of the antenna turntable and the radome fixture do not coincide and the far-field distance is insufficient, which may lead to inaccurate electrical performance tests of the radome. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a method, device and equipment for measuring the electrical properties of a radome.

[0005] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides a method for measuring electrical properties of a radome, comprising:

[0007] Obtain a preset turntable angle, and obtain the initial near-field information value through the radome to be tested based on the receiving antenna in the radome system; the radome system includes: a three-axis freedom antenna turntable, a receiving antenna, a transmitting antenna and a radome to be tested; the radome to be tested and the receiving antenna are fixed on the three-axis freedom antenna turntable through a clamping structure, and the receiving antenna and the transmitting antenna are on the same horizontal line;

[0008] The preset turntable angle is compensated based on the radome system to obtain the far-field spatial angle;

[0009] Performing spectrum conversion processing on the initial near-field information value using a preset turntable angle to obtain a conversion result;

[0010] The radiation field value of the antenna cover to be tested is obtained through the conversion result, the far-field spatial angle and the preset radiation characteristic compensation model; the preset radiation characteristic compensation model is obtained by fitting the difference between the ideal radiation field value and the test radiation field value;

[0011] The radiation field value is taken as the electrical performance measurement result of the antenna cover to be tested.

[0012] Optionally, the preset turntable angle is compensated based on the radome system to obtain a far-field spatial angle, including:

[0013] Based on the preset turntable angle, the following formula is used for compensation to obtain the far-field spatial angle:

[0014]

[0015] in, represents the far-field spatial angle, θ represents the preset turntable angle, d represents the horizontal distance between the transmitting antenna and the rotation center of the three-axis freedom antenna turntable, and z represents the horizontal distance between the receiving antenna and the rotation center of the three-axis freedom antenna turntable.

[0016] Optionally, the initial near-field information value is subjected to spectrum conversion processing using a preset turntable angle to obtain a conversion result, including:

[0017] Based on the preset turntable angle and Fourier transform method, the initial near-field information value is subjected to spectrum conversion processing to obtain a conversion result.

[0018] Optionally, the conversion result is represented as:

[0019]

[0020] Among them, B m Indicates the conversion result. represents the second kind of Hankel function under the mth order of spectral expansion, k represents the wave number of free space, λ represents the wavelength of the frequency when the transmitting antenna is working, u(d,θ) represents the initial near-field information value, θ represents the preset turntable angle, d represents the horizontal distance between the transmitting antenna and the turntable rotation center, j represents the imaginary unit, and e (·) Represents an exponential function with the natural constant e as the base.

[0021] Optionally, the preset radiation characteristic compensation model is expressed as:

[0022]

[0023] in, represents the radiation field value of the antenna cover to be tested, j represents the imaginary unit, m represents the order of spectrum expansion, B m Indicates the conversion result. represents the far-field spatial angle.

[0024] Optionally, the fitting process of the preset radiation characteristic compensation model includes:

[0025] S201, obtaining a preset test turntable angle, and obtaining a test near-field information value through the radome to be tested based on a receiving antenna in the radome system;

[0026] S202, performing compensation processing on the preset test turntable angle based on the radome system to obtain a far-field test space angle;

[0027] S203, performing spectrum conversion processing on the test near-field information value using a preset test turntable angle to obtain a test conversion result;

[0028] S204, obtaining a test radiation field value of the antenna cover to be tested by testing the conversion result, the far-field test space angle and the initial radiation characteristic compensation model;

[0029] S205, judging whether the matching degree between the test radiation field value and the ideal radiation field meets the preset matching condition; the ideal radiation field is obtained based on the simulation application CST simulation;

[0030] S206: When the preset matching is satisfied, the initial radiation characteristic compensation model is used as a preset radiation characteristic compensation model.

[0031] Optionally, after determining whether the matching degree between the test radiation field value and the ideal radiation field meets a preset matching condition, the method for measuring the electrical performance of the radome further includes:

[0032] When the preset match is not satisfied, the spectrum expansion order in the initial radiation characteristic compensation model is increased by a preset step size, and S203 and S204 are re-executed until the condition of S205 is met.

[0033] Optionally, judging whether the matching degree between the test radiation field value and the ideal radiation field satisfies a preset matching condition includes:

[0034] Determine whether the difference between the test radiation field value and the ideal radiation field is less than the preset wave transmittance.

[0035] In a second aspect, the present invention provides a radome electrical performance measurement device, the radome electrical performance measurement device comprising: an acquisition unit, a compensation unit, a conversion unit, a calculation unit, and a determination unit;

[0036] The acquisition unit is used to: obtain a preset turntable angle, and obtain an initial near-field information value through the antenna cover to be tested based on a receiving antenna in the antenna cover system; the antenna cover system includes: a three-axis freedom antenna turntable, a receiving antenna, a transmitting antenna and a antenna cover to be tested; the antenna cover to be tested and the receiving antenna are fixed on the three-axis freedom antenna turntable through a clamping structure, and the receiving antenna and the transmitting antenna are on the same horizontal line;

[0037] The compensation unit is used to: perform compensation processing on the preset turntable angle based on the radome system to obtain the far-field spatial angle;

[0038] The conversion unit is used to: perform spectrum conversion processing on the initial near-field information value using a preset turntable angle to obtain a conversion result;

[0039] The calculation unit is used to obtain the radiation field value of the antenna cover to be tested through the conversion result, the far-field spatial angle and the preset radiation characteristic compensation model; the preset radiation characteristic compensation model is obtained by fitting the difference between the ideal radiation field value and the test radiation field value;

[0040] The determination unit is used to: use the radiation field value as the electrical performance measurement result of the antenna cover to be tested.

[0041] In a third aspect, the present invention provides a radome electrical performance measurement device, comprising: a processor, a storage medium and a bus, wherein the storage medium stores machine-readable instructions executable by the processor. When the radome electrical performance measurement device is running, the processor and the storage medium communicate via the bus, and the processor executes the machine-readable instructions to perform the steps of the radome electrical performance measurement method as described in the first aspect above.

[0042] The present invention provides a method, device and equipment for measuring the electrical performance of a radome. The method for measuring the electrical performance of a radome comprises: obtaining a preset turntable angle, and obtaining the initial near-field information value through the radome to be tested based on the receiving antenna in the radome system; the radome system comprises: a three-axis freedom antenna turntable, a receiving antenna, a transmitting antenna and the radome to be tested; the radome to be tested and the receiving antenna are fixed on the three-axis freedom antenna turntable through a clamping structure, and the receiving antenna and the transmitting antenna are on the same horizontal line; the preset turntable angle is compensated based on the radome system to obtain the far-field spatial angle; the initial near-field information value is subjected to spectrum conversion processing using the preset turntable angle to obtain the conversion result; the radiation field value of the radome to be tested is obtained through the conversion result, the far-field spatial angle and the preset radiation characteristic compensation model; the preset radiation characteristic compensation model is obtained based on the difference fitting between the ideal radiation field value and the test radiation field value; the radiation field value is used as the electrical performance measurement result of the radome to be tested. In the present invention, a radome system is established based on a three-axis antenna turntable, and the system is used to perform angle compensation on a preset turntable angle. Under the action of the compensated far-field spatial angle and a preset radiation characteristic compensation model, the initial near-field information value is processed to obtain a final electrical performance measurement result. Compared with a six-axis rotation clamping device, a three-axis antenna turntable is lightweight and easy to install, thereby avoiding the problems of a long design and processing cycle and high use cost in existing radome electrical performance testing methods. Secondly, since the method of the present invention is based on the existing three-axis antenna turntable and performs design compensation processing according to actual scene errors, the accuracy of the radome electrical performance test is improved.

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of a flow chart of a method for measuring electrical properties of a radome provided in an embodiment of the present invention;

[0045] Figure 2 Comparison results of normalized power patterns obtained by different methods provided in the embodiments of the present invention;

[0046] Figure 3 A schematic structural diagram of a device for measuring electrical properties of a radome provided in an embodiment of the present invention;

[0047] Figure 4 A schematic structural diagram of a radome electrical performance measurement device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0049] In order to improve the accuracy of the electrical performance test of the radome, an embodiment of the present invention provides a method for measuring the electrical performance of the radome. Figure 1 A schematic diagram of a method for measuring the electrical properties of a radome provided in an embodiment of the present invention. Figure 1 As shown, including:

[0050] S101, obtaining a preset turntable angle, and obtaining an initial near-field information value through the radome to be tested based on a receiving antenna in the radome system.

[0051] The radome system includes: a three-axis freedom antenna turntable, a receiving antenna, a transmitting antenna and a radome to be tested; the radome to be tested and the receiving antenna are fixed on the three-axis freedom antenna turntable through a clamping structure, and the receiving antenna and the transmitting antenna are on the same horizontal line.

[0052] S102: Compensate the preset turntable angle based on the radome system to obtain a far-field spatial angle.

[0053] Optionally, S102 may specifically include:

[0054] Based on the preset turntable angle, the following formula is used for compensation to obtain the far-field spatial angle:

[0055]

[0056] in, represents the far-field spatial angle, θ represents the preset turntable angle, d represents the horizontal distance between the transmitting antenna and the rotation center of the three-axis freedom antenna turntable, and z represents the horizontal distance between the receiving antenna and the rotation center of the three-axis freedom antenna turntable.

[0057] S103: Perform spectrum conversion processing on the initial near-field information value using a preset turntable angle to obtain a conversion result.

[0058] Optionally, S103 may specifically include:

[0059] Based on the preset turntable angle and Fourier transform method, the initial near-field information value is subjected to spectrum conversion processing to obtain a conversion result.

[0060] Optionally, the conversion result is represented as:

[0061]

[0062] Among them, B m Indicates the conversion result. represents the second kind of Hankel function under the mth order of spectral expansion, k represents the wave number of free space, λ represents the wavelength of the frequency when the transmitting antenna is working, u(d,θ) represents the initial near-field information value, θ represents the preset turntable angle, d represents the horizontal distance between the transmitting antenna and the turntable rotation center, j represents the imaginary unit, and e (·) Represents an exponential function with the natural constant e as the base.

[0063] S104, obtaining the radiation field value of the antenna cover to be tested through the conversion result, the far-field spatial angle and the preset radiation characteristic compensation model.

[0064] The preset radiation characteristic compensation model is obtained based on the difference fitting between the ideal radiation field value and the test radiation field value.

[0065] Optionally, the preset radiation characteristic compensation model is expressed as:

[0066]

[0067] in, represents the radiation field value of the antenna cover to be tested, j represents the imaginary unit, m represents the order of spectrum expansion, B m Indicates the conversion result. represents the far-field spatial angle.

[0068] Optionally, the fitting process of the preset radiation characteristic compensation model includes:

[0069] S201, obtaining a preset test turntable angle, and obtaining a test near-field information value through the radome to be tested based on a receiving antenna in the radome system;

[0070] S202, performing compensation processing on the preset test turntable angle based on the radome system to obtain a far-field test space angle;

[0071] S203, performing spectrum conversion processing on the test near-field information value using a preset test turntable angle to obtain a test conversion result;

[0072] S204, obtaining a test radiation field value of the antenna cover to be tested by testing the conversion result, the far-field test space angle and the initial radiation characteristic compensation model;

[0073] S205, judging whether the matching degree between the test radiation field value and the ideal radiation field meets the preset matching condition; the ideal radiation field is obtained based on the simulation application CST simulation;

[0074] S206: When the preset matching is satisfied, the initial radiation characteristic compensation model is used as a preset radiation characteristic compensation model.

[0075] Optionally, after S205, the method for measuring electrical properties of the radome further includes:

[0076] When the preset match is not satisfied, the spectrum expansion order in the initial radiation characteristic compensation model is increased by a preset step size, and S203 and S204 are re-executed until the condition of S205 is met.

[0077] Optionally, judging whether the matching degree between the test radiation field value and the ideal radiation field satisfies a preset matching condition includes:

[0078] Determine whether the difference between the test radiation field value and the ideal radiation field is less than the preset wave transmittance.

[0079] S105. Using the radiation field value as the electrical performance measurement result of the antenna cover to be tested.

[0080] An embodiment of the present invention provides a method for measuring the electrical properties of an antenna cover, comprising: establishing a antenna cover system based on an antenna turntable with three axes of freedom, and using the system to perform angle compensation on a preset turntable angle, processing the initial near-field information value under the action of the compensated far-field spatial angle and a preset radiation characteristic compensation model to obtain a final electrical performance measurement result. Since the antenna turntable with three axes of freedom is lighter and easier to install than a rotary clamping device with six axes of freedom, the problem of long design and processing cycle and high use cost in the existing antenna cover electrical performance testing method is avoided. Secondly, since the method of the present invention is based on the existing three-axis freedom antenna turntable and performs design compensation processing according to actual scene errors, the accuracy of the antenna cover electrical performance test is improved.

[0081] In order to verify the effectiveness of the method of the present invention, the embodiment of the present invention also conducted a simulation experiment. As follows:

[0082] 1. Test and simulation experimental conditions:

[0083] The test experimental platform used in this embodiment is: microwave darkroom MVGAMS, 15GHz slot array antenna TF-PA-01, and antenna cover system fixed clamping.

[0084] The platform for the simulation experiment is: Intel i5 8500k CPU, main frequency is 3.0GHz, memory is 16GB.

[0085] The software platform for the simulation experiment is: Windows 10 operating system and Matlab 2020b.

[0086] The test and simulation experiments in this embodiment use a slot array antenna and radome with a working center frequency of 15 GHz. The external radome of the antenna adopts a single-layer dielectric structure. The antenna aperture is 240 mm and the diameter of the radome is 440 mm. The dielectric constant and loss tangent of the radome are 2.81 and 0.023 respectively, and the thickness of the radome is 6.9 mm.

[0087] 2. Test and simulation content and results analysis:

[0088] The method of the present invention and the prior art are used to analyze the electrical performance of the antenna after adding the radome, and the far-field directional diagram and electrical performance index of the antenna after adding the radome are obtained.

[0089] The prior art refers to the Finite Difference Time Domain Method in Computer Simulation Technology Studio Suite (CST Studio Suite), referred to as the FDTD calculation method.

[0090] Combine the following Figure 2 The effects of the present invention are further described.

[0091] Figure 2 The comparison results of normalized power patterns obtained by different methods are shown in Figure 1. Specifically, the results of the existing method (FDTD), the method of the present invention, and the simulation experiment (ideal result) are compared. Figure 2 It is obtained by uniformly selecting 751 sampling points within the preset turntable angle range of [-15°, 15°], testing and calculating the far-field power of the antenna at each sampling point after adding the radome, and normalizing the far-field power to its maximum value. The horizontal axis represents the observation angle of the far-field direction of the antenna, in degrees, and the vertical axis represents the normalized power pattern, in dB. Figure 2 It can be seen that the method of the present invention can correct and compensate for the distortion results of the existing testing technology, and the improved results are basically consistent with the simulation experimental results under ideal conditions, proving that when the rotation center of the antenna cover and the three-axis freedom antenna does not coincide and the darkroom space is small, the method of the present invention shows good consistency with the ideal error-free result, that is, the estimation result is relatively accurate.

[0092] In order to further prove the effect of the simulation experiment of the present invention, the calculation results of the present invention and the prior art are evaluated respectively by using the changes of three electrical performance indicators corresponding to the three methods (gain change, left side lobe level, right side lobe level).

[0093] according to Figure 2 The results of the changes in electrical performance indicators under the three methods of the prior art (radome error test), the method of the present invention and the ideal simulation experiment are obtained, and all the calculation results are plotted into Table 1:

[0094] Table 1. Electrical performance analysis table

[0095]

[0096] From Table 1, it can be seen that compared with the existing simulation technology, the gain error of the antenna cover obtained by the method of the present invention is 0.37dB, the error of the left side lobe level is 0.29dB, and the error of the right side lobe level is 0.28dB, indicating that the error of estimating the electrical performance by the method of the present invention is small, proving the effectiveness of the method of the present invention.

[0097] The method provided in the embodiment of the present invention can be applied to an electronic device. Specifically, the electronic device can be: a desktop computer, a portable computer, an intelligent mobile terminal, a server, etc., which is not limited in the embodiment of the present invention.

[0098] Based on the same inventive concept, an embodiment of the present invention further provides a device for measuring the electrical properties of a radome. Figure 3 A schematic diagram of the structure of a device for measuring the electrical properties of a radome provided in an embodiment of the present invention. Figure 3 As shown, it includes: an acquisition unit 301, a compensation unit 302, a conversion unit 303, a calculation unit 304 and a determination unit 305;

[0099] The acquisition unit 301 is used to: acquire a preset turntable angle, and acquire an initial near-field information value through the antenna cover to be tested based on a receiving antenna in the antenna cover system; the antenna cover system includes: a three-axis freedom antenna turntable, a receiving antenna, a transmitting antenna and a antenna cover to be tested; the antenna cover to be tested and the receiving antenna are fixed on the three-axis freedom antenna turntable through a clamping structure, and the receiving antenna and the transmitting antenna are on the same horizontal line;

[0100] The compensation unit 302 is used to: perform compensation processing on the preset turntable angle based on the radome system to obtain a far-field spatial angle;

[0101] The conversion unit 303 is used to: perform spectrum conversion processing on the initial near-field information value using a preset turntable angle to obtain a conversion result;

[0102] The calculation unit 304 is used to obtain the radiation field value of the antenna cover to be tested through the conversion result, the far-field spatial angle and the preset radiation characteristic compensation model; the preset radiation characteristic compensation model is obtained by fitting the difference between the ideal radiation field value and the test radiation field value;

[0103] The determination unit 305 is used to: use the radiation field value as the electrical performance measurement result of the antenna cover to be tested.

[0104] Figure 4A schematic diagram of the structure of a radome electrical performance measurement device provided by an embodiment of the present invention includes: a processor 710, a storage medium 720 and a bus 730, wherein the storage medium 720 stores machine-readable instructions executable by the processor 710, and when the radome electrical performance measurement device is running, the processor 710 communicates with the storage medium 720 via the bus 730, and the processor 710 executes the machine-readable instructions to execute the steps of the above method embodiment. The specific implementation method and technical effect are similar and will not be repeated here.

[0105] The storage medium may include a random access memory (RAM) or a non-volatile memory (NVM), such as at least one disk storage. Optionally, the storage medium may also be at least one storage device located away from the aforementioned processor.

[0106] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0107] It should be noted that the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention.

[0108] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0109] Although the present invention is described herein in conjunction with various embodiments, in the process of implementing the claimed invention, those skilled in the art can understand and implement other changes of the above disclosed embodiments by viewing the drawings and the disclosed content. In the description of the present invention, the term "comprising" does not exclude other components or steps, "one" or "an" does not exclude multiple situations, and the meaning of "multiple" is two or more, unless otherwise clearly and specifically limited. In addition, certain measures are recorded in different embodiments, but this does not mean that these measures cannot be combined to produce good results.

[0110] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A method for measuring the electrical properties of a radome, characterized in that: include: Obtaining a preset turntable angle, and obtaining an initial near-field information value through the radome to be tested based on a receiving antenna in the radome system; The radome system comprises: a three-axis freedom antenna turntable, a receiving antenna, a transmitting antenna and a radome to be tested; the radome to be tested and the receiving antenna are fixed on the three-axis freedom antenna turntable through a clamping structure, and the receiving antenna and the transmitting antenna are on the same horizontal line; Performing compensation processing on the preset turntable angle based on the radome system to obtain a far-field spatial angle; Performing spectrum conversion processing on the initial near-field information value using the preset turntable angle to obtain a conversion result; The radiation field value of the antenna cover to be tested is obtained through the conversion result, the far-field spatial angle and the preset radiation characteristic compensation model; the preset radiation characteristic compensation model is obtained based on the difference fitting between the ideal radiation field value and the test radiation field value; The radiation field value is used as the electrical performance measurement result of the antenna cover to be tested.

2. The method for measuring the electrical properties of a radome according to claim 1, characterized in that: The compensating the preset turntable angle based on the radome system to obtain a far-field spatial angle includes: Based on the preset turntable angle, the following formula is used for compensation processing to obtain the far-field spatial angle: in, represents the far-field spatial angle, θ represents the preset turntable angle, d represents the horizontal distance between the transmitting antenna and the rotation center of the three-axis freedom antenna turntable, and z represents the horizontal distance between the receiving antenna and the rotation center of the three-axis freedom antenna turntable.

3. The method for measuring the electrical properties of a radome according to claim 1, characterized in that: The using the preset turntable angle to perform spectrum conversion processing on the initial near-field information value to obtain a conversion result includes: Based on the preset turntable angle and the Fourier transform method, the initial near-field information value is subjected to spectrum conversion processing to obtain the conversion result.

4. The method for measuring the electrical properties of a radome according to claim 1 or 3, characterized in that: The conversion result is expressed as: Among them, B m represents the conversion result, represents the second kind of Hankel function under the mth order of spectral expansion, k represents the wave number of free space, λ represents the wavelength of the frequency when the transmitting antenna is working, u(d,θ) represents the initial near-field information value, θ represents the preset turntable angle, d represents the horizontal distance between the transmitting antenna and the turntable rotation center, j represents the imaginary unit, and e (·) Represents an exponential function with the natural constant e as the base.

5. The method for measuring the electrical properties of a radome according to claim 1, characterized in that: The preset radiation characteristic compensation model is expressed as: in, represents the radiation field value of the antenna cover to be tested, j represents the imaginary unit, m represents the order of spectrum expansion, B m represents the conversion result, represents the far-field spatial angle.

6. The method for measuring the electrical properties of a radome according to claim 1, characterized in that: The fitting process of the preset radiation characteristic compensation model includes: S201, obtaining a preset test turntable angle, and obtaining a test near-field information value through the radome to be tested based on a receiving antenna in the radome system; S202, performing compensation processing on the preset test turntable angle based on the radome system to obtain a far-field test space angle; S203, performing spectrum conversion processing on the test near-field information value using the preset test turntable angle to obtain a test conversion result; S204, obtaining a test radiation field value of the antenna cover to be tested through the test conversion result, the far-field test space angle and the initial radiation characteristic compensation model; S205, judging whether the matching degree between the test radiation field value and the ideal radiation field meets a preset matching condition; the ideal radiation field is obtained based on the simulation application CST simulation; S206: When the preset matching is satisfied, use the initial radiation characteristic compensation model as the preset radiation characteristic compensation model.

7. The method for measuring the electrical properties of a radome according to claim 6, characterized in that: After determining whether the matching degree between the test radiation field value and the ideal radiation field meets the preset matching condition, the antenna cover electrical performance measurement method further includes: When the preset match is not satisfied, the spectrum expansion order in the initial radiation characteristic compensation model is increased by a preset step size, and S203 and S204 are re-executed until the condition of S205 is met.

8. The method for measuring the electrical properties of a radome according to claim 6, characterized in that: The determining whether the matching degree between the test radiation field value and the ideal radiation field satisfies a preset matching condition includes: It is determined whether the difference between the test radiation field value and the ideal radiation field is less than a preset transmittance.

9. A device for measuring the electrical properties of a radome, characterized in that: The radome electrical performance measurement device comprises: an acquisition unit, a compensation unit, a conversion unit, a calculation unit and a determination unit; The acquisition unit is used to: acquire a preset turntable angle, and acquire an initial near-field information value through the antenna cover to be tested based on a receiving antenna in the antenna cover system; the antenna cover system comprises: a three-axis freedom antenna turntable, a receiving antenna, a transmitting antenna and a antenna cover to be tested; the antenna cover to be tested and the receiving antenna are fixed on the three-axis freedom antenna turntable through a clamping structure, and the receiving antenna and the transmitting antenna are on the same horizontal line; The compensation unit is used to: perform compensation processing on the preset turntable angle based on the radome system to obtain a far-field spatial angle; The conversion unit is used to: perform spectrum conversion processing on the initial near-field information value using the preset turntable angle to obtain a conversion result; The calculation unit is used to: obtain the radiation field value of the antenna cover to be tested through the conversion result, the far-field spatial angle and a preset radiation characteristic compensation model; the preset radiation characteristic compensation model is obtained based on the difference fitting between the ideal radiation field value and the test radiation field value; The determination unit is used to: use the radiation field value as the electrical performance measurement result of the antenna cover to be tested.

10. A radome electrical performance measurement device, characterized in that: include: A processor, a storage medium and a bus, wherein the storage medium stores machine-readable instructions executable by the processor, and when the antenna cover electrical performance measurement device is running, the processor communicates with the storage medium via the bus, and the processor executes the machine-readable instructions to perform the steps of the antenna cover electrical performance measurement method as described in any one of claims 1 to 8.

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