Compound field characteristic optimization method and system based on stray suppression and aberration compensation

Abstract

The application provides a complex field characteristic optimization method and system based on stray suppression and aberration compensation, comprising: designing a bias-fed parabolic body structure, setting a feed antenna, a beam complex lens, designing an aberration compensation lens group, and performing edge processing on the bias-fed parabolic body; coating a wave-absorbing material, calculating a set static zone field amplitude and phase fluctuation; if the calculated static zone field amplitude and phase fluctuation result does not conform to a preset standard, performing Fourier transform on a phase distribution curve to obtain angular position information, and performing wave-absorbing material processing on corresponding phase distribution abnormal distribution points; if the calculation result conforms to the preset standard, performing volume and weight optimization; adding a turntable, performing wave-absorbing processing, and performing static zone field characteristic calculation; if the calculation result conforms to the preset standard, completing stray suppression processing. The application performs calculation and analysis on a radio frequency field on the basis that an infrared target design meets imaging quality, thereby avoiding the problem of poor infrared imaging quality caused by an existing parabolic metal mesh.

Description

Technical Field

[0001] This invention relates to the field of infrared and millimeter-wave multi-simulation technology, specifically to a method and system for optimizing composite field characteristics based on spurious suppression and aberration compensation, and more specifically to a method and system for spurious suppression and aberration compensation of a radio frequency / infrared composite target simulation system in a radio frequency / infrared composite guidance and control hardware-in-the-loop simulation system. Background Technology

[0002] The radio frequency / infrared composite target simulation system of the hardware-in-the-loop guidance and control system needs to combine the physical radiation of the two frequency bands together. Due to the introduction of a beamforming medium that transmits radio frequency and reflects infrared or reflects frequency and transmits infrared, distortion of radio frequency and infrared signals is inevitable.

[0003] Patent documents CN104215950A and CN108461920A disclose a method for infrared microwave beamforming, in which a metal mesh grating is placed at the center of a rotating parabolic reflector. The metal mesh grating transmits infrared signals, while both the metal mesh grating and the rotating parabolic reflector simultaneously reflect microwave signals, thus combining the infrared and microwave signals. This method introduces radio frequency (RF) spurious emissions and infrared aberrations that are difficult to compensate for. On one hand, to avoid the non-uniform effect of direct openings on the parabolic surface on the RF field, a metal mesh grating structure is used to compensate for RF distortion. However, manufacturing errors in the metal mesh grating cause phase fluctuations in the still plane to be much greater than 10°, making distortion difficult to suppress. On the other hand, the metal mesh grating structure reduces infrared energy transmittance, and the diffraction effect of the metal mesh grating causes a significant decrease in infrared imaging quality, far exceeding the requirements of a single pixel size. In this case, infrared aberrations cannot be effectively compensated.

[0004] Existing composite target simulation systems focus on the implementation of radio frequency (RF) target simulation and infrared target simulation, emphasizing only the technical specifications of RF or infrared targets, without systematically considering RF and infrared targets as a whole for spurious suppression and aberration compensation. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the purpose of this invention is to provide a method and system for optimizing composite field characteristics based on stray suppression and aberration compensation.

[0006] A method for optimizing composite field characteristics based on stray suppression and aberration compensation, provided by the present invention, includes:

[0007] Step S1: Design the main structure of the offset parabolic surface, set up the feed antenna and beam composite lens, design the aberration compensation lens group according to the infrared imaging quality, and perform edge processing of the offset parabolic surface.

[0008] Step S2: Design the feed antenna in conjunction with the beamforming composite lens and the offset parabolic surface, cover it with absorbing material, and calculate the set static field amplitude and phase fluctuation.

[0009] Step S3: If the calculated static field amplitude and phase fluctuation results do not meet the preset standards, perform Fourier transform on the phase distribution curve to obtain angular position information, process the corresponding abnormal phase distribution points with absorbing materials, and jump to step S2.

[0010] If the calculation results meet the preset standards, optimize the volume and weight.

[0011] Step S4: Add a turntable, perform wave absorption on the turntable, and calculate the static field characteristics. If the calculation results do not meet the preset standards, optimize the volume and weight and repeat step S4.

[0012] If the calculation results meet the preset standards, the stray suppression process is complete.

[0013] Preferably, in step S1:

[0014] Step S1.1: Design the main structure of the offset parabolic surface according to the quiet zone size requirements, and ensure that the surface accuracy of the parabolic surface meets the reflection requirements within the optical wavelength range;

[0015] Step S1.2: Design the feed antenna according to the radio frequency signal band and polarization requirements. Position the feed antenna at the focal point of the offset parabolic surface. Add a beamforming composite lens that transmits radio frequency and reflects infrared to the front end of the feed antenna. The size of the beamforming composite lens covers the infrared incident angle field of view and the outer contour of the antenna.

[0016] Step S1.3: Place the infrared imaging simulator chip below the offset parabolic surface, and use the beam compound lens to turn the optical path to below the offset parabolic surface;

[0017] Step S1.4: Add an aberration compensation lens group between the radio frequency transmittance and infrared reflectance beam composite lens and the infrared imaging simulator chip to compensate for the aberrations caused by the single offset parabolic surface;

[0018] Step S1.5: Evaluate the infrared imaging quality in the optical software. If the speckles in all fields of view of the obtained system dot plot are smaller than the size of 1 pixel of the infrared imaging simulator chip, then the requirements are met.

[0019] If any of the dots in the field of view of the obtained system dot plot are larger than or equal to 1 pixel in size of the infrared imaging simulator chip, proceed to step S1.4 to redesign the aberration compensation lens group.

[0020] Step S1.6: Perform edge processing on the offset parabolic surface, including curling or jagged edge processing.

[0021] Preferably, in step S2:

[0022] The feed antenna is designed in conjunction with a beam composite lens that transmits radio frequency and reflects infrared, and a parabolic surface. The infrared imaging simulator chip and aberration compensation lens group are covered with absorbing material as a whole. Commercial electromagnetic software is used to calculate the set static field amplitude and phase fluctuation.

[0023] Preferably, in step S3:

[0024] The amplitude and phase distributions of all points in the plane are fitted. If the phase fluctuation in the plane where the calculated static field rotation center is located is greater than or equal to 10° in the X and Ku bands or greater than or equal to 22° in the Ka band or greater than or equal to 1dB, the maximum value of the difference between the amplitude or phase value in the plane and the amplitude and phase difference of the corresponding point on the fitted surface is taken as the amplitude and phase fluctuation. Fourier transform is performed on the phase distribution curve to obtain the angular position information. The corresponding abnormal phase distribution points are processed with absorbing materials.

[0025] If the phase fluctuation within the plane where the calculated static field rotation center is located is less than 10° in the X and Ku bands and less than 22° in the Ka band, and the amplitude fluctuation is less than 1dB, then volume and weight optimization is performed.

[0026] Preferably, in step S4:

[0027] Add a turntable structure, perform wave absorption treatment on the turntable, apply wave absorbing material or coat with wave absorbing paint, and perform static field characteristic calculations on the turntable.

[0028] If the phase fluctuation within the plane where the calculated static field rotation center is located is less than 10° and the amplitude fluctuation is less than 1dB, the stray suppression processing of the entire simulation system is completed.

[0029] A composite field characteristic optimization system based on spurious suppression and aberration compensation, provided by the present invention, includes:

[0030] Module M1: Design the main structure of the offset parabolic surface, set up the feed antenna and beamforming composite lens, design the aberration compensation lens group according to the infrared imaging quality, and perform edge processing of the offset parabolic surface;

[0031] Module M2: The feed antenna is designed in conjunction with the beamforming composite lens and the offset parabolic surface, covered with absorbing material, and the amplitude and phase fluctuation of the set quiet zone field are calculated.

[0032] Module M3: If the calculated static field amplitude and phase fluctuation results do not meet the preset standards, perform Fourier transform on the phase distribution curve to obtain angular position information, process the corresponding abnormal phase distribution points with absorbing materials, and trigger module M2.

[0033] If the calculation results meet the preset standards, optimize the volume and weight.

[0034] Module M4: Add a turntable, perform wave absorption on the turntable, calculate the static field characteristics, and if the calculation results do not meet the preset standards, optimize the volume and weight and then repeatedly trigger module M4.

[0035] If the calculation results meet the preset standards, the stray suppression process is complete.

[0036] Preferably, in module M1:

[0037] Module M1.1: The main structure of the offset parabolic surface is designed according to the quiet zone size requirements, and the surface accuracy of the parabolic surface meets the reflection requirements within the optical wavelength range;

[0038] Module M1.2: Design the feed antenna according to the radio frequency signal band and polarization requirements. Position the feed antenna at the focal point of the offset parabolic surface. Add a beamforming composite lens that transmits radio frequency and reflects infrared to the front end of the feed antenna. The size of the beamforming composite lens covers the infrared incident angle field of view and the outer contour of the antenna.

[0039] Module M1.3: An infrared imaging simulator chip is placed below the offset parabolic surface, and the optical path is turned to the area below the offset parabolic surface by a beamforming compound lens;

[0040] Module M1.4: An aberration compensation lens group is added between the radio frequency transmittance and infrared reflectance beam composite lens and the infrared imaging simulator chip to compensate for the aberrations caused by the single offset parabolic surface;

[0041] Module M1.5: Evaluates the infrared imaging quality in optical software. If the speckles in all fields of view of the obtained system dot plot are smaller than the size of 1 pixel of the infrared imaging simulator chip, then the usage requirements are met.

[0042] If the obtained system dot plot has a dot size greater than or equal to 1 pixel of the infrared imaging simulator chip, the trigger module M1.4 will redesign the aberration compensation lens group.

[0043] Module M1.6: Edge processing of the off-feed parabolic surface, including curling or jagged edges.

[0044] Preferably, in module M2:

[0045] The feed antenna is designed in conjunction with a beam composite lens that transmits radio frequency and reflects infrared, and a parabolic surface. The infrared imaging simulator chip and aberration compensation lens group are covered with absorbing material as a whole. Commercial electromagnetic software is used to calculate the set static field amplitude and phase fluctuation.

[0046] Preferably, in module M3:

[0047] The amplitude and phase distributions of all points in the plane are fitted. If the phase fluctuation in the plane where the calculated static field rotation center is located is greater than or equal to 10° in the X and Ku bands or greater than or equal to 22° in the Ka band or greater than or equal to 1dB, the maximum value of the difference between the amplitude or phase value in the plane and the amplitude and phase difference of the corresponding point on the fitted surface is taken as the amplitude and phase fluctuation. Fourier transform is performed on the phase distribution curve to obtain the angular position information. The corresponding abnormal phase distribution points are processed with absorbing materials.

[0048] If the phase fluctuation within the plane where the calculated static field rotation center is located is less than 10° in the X and Ku bands and less than 22° in the Ka band, and the amplitude fluctuation is less than 1dB, then volume and weight optimization is performed.

[0049] Preferably, in module M4:

[0050] Add a turntable structure, perform wave absorption treatment on the turntable, apply wave absorbing material or coat with wave absorbing paint, and perform static field characteristic calculations on the turntable.

[0051] If the phase fluctuation within the plane where the calculated static field rotation center is located is less than 10° and the amplitude fluctuation is less than 1dB, the stray suppression processing of the entire simulation system is completed.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] 1. This invention, based on the infrared target design meeting imaging quality requirements, then performs radio frequency field calculation and analysis, avoiding the problem of poor infrared imaging quality caused by existing parabolic metal mesh gratings.

[0054] 2. This invention performs overall design calculations for the feed source, radio frequency transparent infrared reflector and parabolic surface in the radio frequency link, avoiding the problem of static field distortion caused by inserting radio frequency transparent infrared reflector composite devices in the radio frequency field;

[0055] 3. This invention calculates the amplitude and phase characteristics of the simulation system as a whole, performs stray suppression and aberration compensation, and achieves the goal of effectively optimizing the simulation system. Attached Figure Description

[0056] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0057] Figure 1 This is a flowchart of the composite field characteristic optimization method based on stray suppression and aberration compensation of the present invention. Detailed Implementation

[0058] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0059] Example 1:

[0060] This invention discloses a method for optimizing the characteristics of a composite field based on spurious suppression and aberration compensation. This method primarily compensates for and optimizes the uniformity of the radio frequency (RF) quiet zone field and the infrared imaging quality formed by microwave / infrared composite targets. Based on an RF infrared parabolic reflector, this invention uses tilted and eccentric mirror groups for infrared imaging quality compensation, judging whether the requirements are met by the point spot size in the imaging dot pattern being smaller than the size of a single pixel in the simulated device. The RF feed, beam-composite mirrors that transmit RF and reflect infrared, and the parabolic reflector are jointly designed, with phase fluctuations within the plane of the quiet zone field rotation center being less than 10° and amplitude fluctuations less than 1dB as the judgment criteria. Finally, electromagnetic field spurious suppression is performed on details such as applying absorbing materials to the simulation system, with phase fluctuations within the quiet zone field being less than 10° and amplitude fluctuations less than 1dB as the judgment criteria, ultimately determining whether the RF spurious suppression objective is achieved. This invention can solve the problems in hardware-in-the-loop simulation systems where the amplitude and phase distribution of the RF quiet zone field formed by a rotating parabolic reflector are difficult to approximate ideal plane waves, and the difficulty in achieving high-fidelity simulation of infrared physical radiation image quality.

[0061] According to the present invention, a method for optimizing the characteristics of a composite field based on stray suppression and aberration compensation is provided, such as... Figure 1 As shown, it includes:

[0062] Step S1: Design the main structure of the offset parabolic surface, set up the feed antenna and beam composite lens, design the aberration compensation lens group according to the infrared imaging quality, and perform edge processing of the offset parabolic surface.

[0063] Specifically, in step S1:

[0064] Step S1.1: Design the main structure of the offset parabolic surface according to the quiet zone size requirements, and ensure that the surface accuracy of the parabolic surface meets the reflection requirements within the optical wavelength range;

[0065] Step S1.2: Design the feed antenna according to the radio frequency signal band and polarization requirements. Position the feed antenna at the focal point of the offset parabolic surface. Add a beamforming composite lens that transmits radio frequency and reflects infrared to the front end of the feed antenna. The size of the beamforming composite lens covers the infrared incident angle field of view and the outer contour of the antenna.

[0066] Step S1.3: Place the infrared imaging simulator chip below the offset parabolic surface, and use the beam compound lens to turn the optical path to below the offset parabolic surface;

[0067] Step S1.4: Add an aberration compensation lens group between the radio frequency transmittance and infrared reflectance beam composite lens and the infrared imaging simulator chip to compensate for the aberrations caused by the single offset parabolic surface;

[0068] Step S1.5: Evaluate the infrared imaging quality in the optical software. If the speckles in all fields of view of the obtained system dot plot are smaller than the size of 1 pixel of the infrared imaging simulator chip, then the requirements are met.

[0069] If any of the dots in the field of view of the obtained system dot plot are larger than or equal to 1 pixel in size of the infrared imaging simulator chip, proceed to step S1.4 to redesign the aberration compensation lens group.

[0070] Step S1.6: Perform edge processing on the offset parabolic surface, including curling or jagged edge processing.

[0071] Step S2: Design the feed antenna in conjunction with the beamforming composite lens and the offset parabolic surface, cover it with absorbing material, and calculate the set static field amplitude and phase fluctuation.

[0072] Specifically, in step S2:

[0073] The feed antenna is designed in conjunction with a beam composite lens that transmits radio frequency and reflects infrared, and a parabolic surface. The infrared imaging simulator chip and aberration compensation lens group are covered with absorbing material as a whole. Commercial electromagnetic software is used to calculate the set static field amplitude and phase fluctuation.

[0074] Step S3: If the calculated static field amplitude and phase fluctuation results do not meet the preset standards, perform Fourier transform on the phase distribution curve to obtain angular position information, process the corresponding abnormal phase distribution points with absorbing materials, and jump to step S2.

[0075] If the calculation results meet the preset standards, optimize the volume and weight.

[0076] Specifically, in step S3:

[0077] The amplitude and phase distributions of all points in the plane are fitted. If the phase fluctuation in the plane where the calculated static field rotation center is located is greater than or equal to 10° in the X and Ku bands or greater than or equal to 22° in the Ka band or greater than or equal to 1dB, the maximum value of the difference between the amplitude or phase value in the plane and the amplitude and phase difference of the corresponding point on the fitted surface is taken as the amplitude and phase fluctuation. Fourier transform is performed on the phase distribution curve to obtain the angular position information. The corresponding abnormal phase distribution points are processed with absorbing materials.

[0078] If the phase fluctuation within the plane where the calculated static field rotation center is located is less than 10° in the X and Ku bands and less than 22° in the Ka band, and the amplitude fluctuation is less than 1dB, then volume and weight optimization is performed.

[0079] Step S4: Add a turntable, perform wave absorption on the turntable, and calculate the static field characteristics. If the calculation results do not meet the preset standards, optimize the volume and weight and repeat step S4.

[0080] If the calculation results meet the preset standards, the stray suppression process is complete.

[0081] Specifically, in step S4:

[0082] Add a turntable structure, perform wave absorption treatment on the turntable, apply wave absorbing material or coat with wave absorbing paint, and perform static field characteristic calculations on the turntable.

[0083] If the phase fluctuation within the plane where the calculated static field rotation center is located is less than 10° and the amplitude fluctuation is less than 1dB, the stray suppression processing of the entire simulation system is completed.

[0084] Example 2:

[0085] Example 2 is a preferred embodiment of Example 1, and is used to illustrate the present invention in more detail.

[0086] The present invention also provides a composite field characteristic optimization system based on spurious suppression and aberration compensation. The composite field characteristic optimization system based on spurious suppression and aberration compensation can be implemented by executing the process steps of the composite field characteristic optimization method based on spurious suppression and aberration compensation. That is, those skilled in the art can understand the composite field characteristic optimization method based on spurious suppression and aberration compensation as a preferred embodiment of the composite field characteristic optimization system based on spurious suppression and aberration compensation.

[0087] A composite field characteristic optimization system based on spurious suppression and aberration compensation, provided by the present invention, includes:

[0088] Module M1: Design the main structure of the offset parabolic surface, set up the feed antenna and beamforming composite lens, design the aberration compensation lens group according to the infrared imaging quality, and perform edge processing of the offset parabolic surface;

[0089] Specifically, in module M1:

[0090] Module M1.1: The main structure of the offset parabolic surface is designed according to the quiet zone size requirements, and the surface accuracy of the parabolic surface meets the reflection requirements within the optical wavelength range;

[0091] Module M1.2: Design the feed antenna according to the radio frequency signal band and polarization requirements. Position the feed antenna at the focal point of the offset parabolic surface. Add a beamforming composite lens that transmits radio frequency and reflects infrared to the front end of the feed antenna. The size of the beamforming composite lens covers the infrared incident angle field of view and the outer contour of the antenna.

[0092] Module M1.3: An infrared imaging simulator chip is placed below the offset parabolic surface, and the optical path is turned to the area below the offset parabolic surface by a beamforming compound lens;

[0093] Module M1.4: An aberration compensation lens group is added between the radio frequency transmittance and infrared reflectance beam composite lens and the infrared imaging simulator chip to compensate for the aberrations caused by the single offset parabolic surface;

[0094] Module M1.5: Evaluates the infrared imaging quality in optical software. If the speckles in all fields of view of the obtained system dot plot are smaller than the size of 1 pixel of the infrared imaging simulator chip, then the usage requirements are met.

[0095] If the obtained system dot plot has a dot size greater than or equal to 1 pixel of the infrared imaging simulator chip, the trigger module M1.4 will redesign the aberration compensation lens group.

[0096] Module M1.6: Edge processing of the off-feed parabolic surface, including curling or jagged edges.

[0097] Module M2: The feed antenna is designed in conjunction with the beamforming composite lens and the offset parabolic surface, covered with absorbing material, and the amplitude and phase fluctuation of the set quiet zone field are calculated.

[0098] Specifically, in module M2:

[0099] The feed antenna is designed in conjunction with a beam composite lens that transmits radio frequency and reflects infrared, and a parabolic surface. The infrared imaging simulator chip and aberration compensation lens group are covered with absorbing material as a whole. Commercial electromagnetic software is used to calculate the set static field amplitude and phase fluctuation.

[0100] Module M3: If the calculated static field amplitude and phase fluctuation results do not meet the preset standards, perform Fourier transform on the phase distribution curve to obtain angular position information, process the corresponding abnormal phase distribution points with absorbing materials, and trigger module M2.

[0101] If the calculation results meet the preset standards, optimize the volume and weight.

[0102] Specifically, in module M3:

[0103] The amplitude and phase distributions of all points in the plane are fitted. If the phase fluctuation in the plane where the calculated static field rotation center is located is greater than or equal to 10° in the X and Ku bands or greater than or equal to 22° in the Ka band or greater than or equal to 1dB, the maximum value of the difference between the amplitude or phase value in the plane and the amplitude and phase difference of the corresponding point on the fitted surface is taken as the amplitude and phase fluctuation. Fourier transform is performed on the phase distribution curve to obtain the angular position information. The corresponding abnormal phase distribution points are processed with absorbing materials.

[0104] If the phase fluctuation within the plane where the calculated static field rotation center is located is less than 10° in the X and Ku bands and less than 22° in the Ka band, and the amplitude fluctuation is less than 1dB, then volume and weight optimization is performed.

[0105] Module M4: Add a turntable, perform wave absorption on the turntable, calculate the static field characteristics, and if the calculation results do not meet the preset standards, optimize the volume and weight and then repeatedly trigger module M4.

[0106] If the calculation results meet the preset standards, the stray suppression process is complete.

[0107] Specifically, in module M4:

[0108] Add a turntable structure, perform wave absorption treatment on the turntable, apply wave absorbing material or coat with wave absorbing paint, and perform static field characteristic calculations on the turntable.

[0109] If the phase fluctuation within the plane where the calculated static field rotation center is located is less than 10° and the amplitude fluctuation is less than 1dB, the stray suppression processing of the entire simulation system is completed.

[0110] Example 3:

[0111] Example 3 is a preferred example of Example 1, and is used to illustrate the present invention in more detail.

[0112] To address the shortcomings of existing technologies, the purpose of this invention is to provide a method for optimizing composite field characteristics based on spurious suppression and aberration compensation, thereby solving the problems in hardware-in-the-loop simulation systems where the amplitude and phase distribution of the radio frequency quiet zone field formed by a rotating parabolic reflector are difficult to approximate ideal plane waves and where high-fidelity simulation of infrared physical radiation image quality is challenging.

[0113] This invention discloses a method for optimizing the characteristics of a composite field based on stray suppression and aberration compensation. The method mainly includes the following steps:

[0114] Step 1: Perform initial design of the main structure of the offset parabolic surface according to the requirements of the quiet zone size, and ensure that the surface accuracy of the parabolic surface meets the reflection requirements within the optical wavelength range;

[0115] Step 2: Design the feed antenna according to the radio frequency signal band, polarization requirements, etc., and place the feed antenna at the focal point of the parabolic surface. Add a beam composite lens that transmits radio frequency and reflects infrared to the front end of the feed antenna. The size of the lens covers the infrared incident angle field of view and the outer contour of the antenna.

[0116] Step 3: Add a lens group between the radio frequency transmittance and infrared reflectance beam composite lens and the infrared imaging simulator chip to compensate for the aberrations caused by the single offset parabolic surface.

[0117] Positional relationship: An infrared imaging simulator chip is placed below the parabola, and the light path is turned to the area below the parabola by relying on an anti-infrared beam composite lens.

[0118] Step four: Evaluate the infrared imaging quality in optical software such as Zemax. If the speckles in all fields of view of the obtained system dot plot are smaller than the size of 1 pixel of the infrared imaging simulator chip, then the requirements are met. If the speckles in all fields of view of the obtained system dot plot are larger than the size of 1 pixel of the infrared imaging simulator chip, then the optical system of the aberration compensation lens group needs to be redesigned.

[0119] Step 5: Perform edge treatment on the offset parabolic surface, either by curling or jagged edges, with curling being the preferred method.

[0120] Step 6: The feed antenna is designed in conjunction with the radio frequency transparent and infrared reflective beam composite lens and parabolic surface. At the same time, the infrared imaging simulator chip and aberration compensation lens group are covered with absorbing material, and the set static field amplitude and phase fluctuation are calculated.

[0121] Electromagnetic calculations were all performed using commercial electromagnetic software, such as Feko. The calculations of the quiet zone electromagnetic field, from the design of the main structure of the parabolic surface and the design of the feed antenna to the addition of radio frequency transmission lenses, were all performed in commercial electromagnetic software.

[0122] Step 7: If the phase fluctuation within the plane where the calculated static field rotation center is located is greater than or equal to 10° (X, Ku band) or 22° (Ka band) or the amplitude fluctuation is greater than or equal to 1dB, then the amplitude distribution and phase distribution of all points in the plane are fitted. The maximum value of the difference between the amplitude or phase value in the plane and the amplitude and phase of the corresponding point on the fitted surface is taken as the amplitude and phase fluctuation. Then, the phase distribution curve is further subjected to Fourier transform to obtain angular position information, and the corresponding abnormal phase distribution points are processed with absorbing materials.

[0123] Step 8: If the phase fluctuation in the plane where the calculated static field rotation center is located is less than 10° (X, Ku band) or 22° (Ka band) and the amplitude fluctuation is less than 1dB, then further optimize the volume and weight of the composite target simulation system, and reduce the weight on the basis of meeting the performance requirements so that it can work on the turntable.

[0124] Step 9: Add a turntable structure and perform wave-absorbing treatment on the turntable, such as applying wave-absorbing materials or coating wave-absorbing paint. Preferably, all exposed metal parts of the turntable are covered with wave-absorbing materials or wave-absorbing coatings. Then, perform static field characteristic calculations on the turntable for the composite target simulation system.

[0125] Step 10: If the phase fluctuation within the plane where the center of rotation of the static field is located is less than 10° and the amplitude fluctuation is less than 1dB, then the stray suppression processing of the entire simulation system is completed.

[0126] Example 4:

[0127] Example 4 is a preferred example of Example 1, which is used to illustrate the present invention in more detail.

[0128] This invention discloses a method for optimizing the characteristics of a composite field based on stray suppression and aberration compensation. The method mainly includes the following steps:

[0129] Step 1: Design the initial structure of the offset parabolic surface according to the requirement of a quiet zone size of 300mm×300mm and a focal length of 600mm. Determine the quiet zone area based on the location of the RF detector. The axial distance of the quiet zone from the parabolic surface is 12000mm. The surface accuracy of the parabolic surface meets the reflection requirements within the optical wavelength range, with a surface accuracy of 0.03μm.

[0130] Step 2: Design the feed antenna according to the radio frequency signal band, horizontal or vertical polarization requirements, etc., and place the feed antenna at the focal point of the parabolic surface. Add a beam composite lens that transmits radio frequency and reflects infrared to the front end of the feed antenna. The size of the lens covers the infrared incident field of view and the outer contour of the antenna.

[0131] Step 3: Add a supplementary lens group between the radio frequency-transmitting and infrared-reflecting beam composite lens and the infrared imaging simulator chip. The supplementary lens group consists of 4 lenses, with each pair of lenses being coaxial. The two groups are tilted and eccentric to balance the residual asymmetric aberration of the front group, thereby compensating for the infrared aberration caused by the single offset parabolic surface.

[0132] Step four: Evaluate the infrared imaging quality. If the speckle in the infrared optical system dot map is smaller than the size of one pixel of the infrared imaging simulator chip, then the requirements are met and the infrared imaging quality compensation is completed. If the speckle in the obtained infrared optical system dot map is larger than the size of one pixel of the infrared imaging simulator chip, then the relay lens optical system needs to be further designed and optimized until the requirements are met.

[0133] Step 5: Perform edge processing on the offset parabolic surface, such as edge curling or serration processing. Edge curling is preferred to reduce electromagnetic scattering at the edge of the parabolic surface.

[0134] Step 6: The feed antenna is designed in conjunction with the radio frequency transparent and infrared reflective beam composite lens and parabolic surface. At the same time, an infrared simulator structure is added. In addition to the infrared lens, the infrared simulator structure is a sealed metal structure, and the metal structure is covered with triangular wedge absorbing material.

[0135] Step 7: If the phase fluctuation in the plane where the turntable rotation center is located is greater than 10° or the amplitude fluctuation is greater than 1dB, then the phase distribution curve is further subjected to Fourier transform to obtain angular position information, and the corresponding abnormal phase distribution points are subjected to microwave absorbing material covering optimization processing.

[0136] Step 8: If the phase fluctuation in the plane where the center of rotation of the calculated static field turntable is located is less than 10° and the amplitude fluctuation is less than 1dB, then further optimize the volume and weight of the composite target simulation system, and appropriately reduce the weight on the basis of meeting the performance requirements so that it can work on the turntable.

[0137] Step 9: Add a turntable structure and perform wave-absorbing treatment on the turntable by applying wave-absorbing material or coating it with wave-absorbing coating / paint, etc. All exposed metal parts of the turntable are covered with wave-absorbing material. Then, perform static field characteristic calculations on the turntable for the composite target simulation system.

[0138] Step 10: If the phase fluctuation in the plane where the turntable rotation center is located is less than 10° and the amplitude fluctuation is less than 1dB, then the stray suppression processing of the entire simulation system is completed.

[0139] Preferably, the horn antenna is made into a movable structure, so that when the phase center drifts, the phase center can be corrected by fine-tuning the horn antenna.

[0140] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0141] Those skilled in the art will understand that, in addition to implementing the system, apparatus, and their modules provided by this invention in purely computer-readable program code, the same program can be implemented in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system, apparatus, and their modules provided by this invention can be considered a hardware component, and the modules included therein for implementing various programs can also be considered structures within the hardware component; alternatively, modules for implementing various functions can be considered both software programs implementing the method and structures within the hardware component.

[0142] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for optimizing the characteristics of a composite field based on spurious suppression and aberration compensation, characterized in that, include: Step S1: Design the main structure of the offset parabolic surface, set up the feed antenna and beam composite lens, design the aberration compensation lens group according to the infrared imaging quality, and perform edge processing of the offset parabolic surface. Step S2: Design the feed antenna in conjunction with the beam composite lens and the offset parabolic surface, cover the infrared imaging simulator chip and aberration compensation lens group with absorbing material, and calculate the set static field amplitude and phase fluctuation. Step S3: If the calculated static field amplitude and phase fluctuation results do not meet the preset standards, perform Fourier transform on the phase distribution curve to obtain angular position information, process the corresponding abnormal phase distribution points with absorbing materials, and jump to step S2. If the calculation results meet the preset standards, the volume and weight of the composite target simulation system are optimized. Step S4: Add a turntable, perform wave absorption on the turntable, and calculate the static field characteristics. If the calculation results do not meet the preset standards, optimize the volume and weight and repeat step S4. If the calculation results meet the preset standards, the stray suppression process is complete.

2. The method for optimizing composite field characteristics based on spurious suppression and aberration compensation according to claim 1, characterized in that, In step S1: Step S1.1: Design the main structure of the offset parabolic surface according to the quiet zone size requirements, and ensure that the surface accuracy of the parabolic surface meets the reflection requirements within the optical wavelength range; Step S1.2: Design the feed antenna according to the radio frequency signal band and polarization requirements, place the feed antenna at the focal position of the offset parabolic surface, and add a beamforming lens to the front end of the feed antenna. The size of the beamforming lens covers the infrared incident angle field of view and the outer contour of the antenna. Step S1.3: Place the infrared imaging simulator chip below the offset parabolic surface, and use the beam composite lens to turn the optical path to below the offset parabolic surface; Step S1.4: Add an aberration compensation lens group between the beam composite lens and the infrared imaging simulator chip to compensate for the aberrations caused by the single offset parabolic surface; Step S1.5: Evaluate the infrared imaging quality in the optical software. If the speckles in all fields of view of the obtained system dot plot are smaller than the size of 1 pixel of the infrared imaging simulator chip, then the requirements are met. If any of the dots in the field of view of the obtained system dot plot are larger than or equal to 1 pixel in size of the infrared imaging simulator chip, proceed to step S1.4 to redesign the aberration compensation lens group. Step S1.6: Perform edge processing on the off-feed parabolic surface, including curling or jagged edge processing.

3. The method for optimizing composite field characteristics based on spurious suppression and aberration compensation according to claim 1, characterized in that, In step S2: The feed antenna is designed in conjunction with the beamforming composite lens and the offset parabolic surface. The infrared imaging simulator chip and aberration compensation lens group are covered with absorbing material. Commercial electromagnetic software is used to calculate the set static field amplitude and phase fluctuation.

4. The method for optimizing composite field characteristics based on spurious suppression and aberration compensation according to claim 1, characterized in that, In step S3: The amplitude and phase distributions of all points in the plane are fitted. If the phase fluctuation in the plane where the calculated static field rotation center is located is greater than or equal to 10° in the X and Ku bands or greater than or equal to 22° in the Ka band or greater than or equal to 1dB, the maximum value of the difference between the amplitude or phase value in the plane and the amplitude and phase difference of the corresponding point on the fitted surface is taken as the amplitude and phase fluctuation. Fourier transform is performed on the phase distribution curve to obtain the angular position information. The corresponding abnormal phase distribution points are processed with absorbing materials. If the phase fluctuation within the plane where the calculated static field rotation center is located is less than 10° in the X and Ku bands and less than 22° in the Ka band, and the amplitude fluctuation is less than 1dB, then volume and weight optimization is performed.

5. The method for optimizing composite field characteristics based on spurious suppression and aberration compensation according to claim 1, characterized in that, In step S4: Add a turntable structure, perform wave absorption treatment on the turntable, apply wave absorbing material or coat with wave absorbing paint, and perform static field characteristic calculations on the turntable. If the phase fluctuation within the plane where the calculated static field rotation center is located is less than 10° and the amplitude fluctuation is less than 1dB, the stray suppression processing of the entire simulation system is completed.

6. A composite field characteristic optimization system based on spurious suppression and aberration compensation, characterized in that, include: Module M1: Design the main structure of the offset parabolic surface, set up the feed antenna and beamforming composite lens, design the aberration compensation lens group according to the infrared imaging quality, and perform edge processing of the offset parabolic surface; Module M2: The feed antenna is designed in conjunction with the beam composite lens and the offset parabolic surface. The infrared imaging simulator chip and aberration compensation lens group are covered with absorbing material to calculate the set static field amplitude and phase fluctuation. Module M3: If the calculated static field amplitude and phase fluctuation results do not meet the preset standards, perform Fourier transform on the phase distribution curve to obtain angular position information, process the corresponding abnormal phase distribution points with absorbing materials, and trigger module M2. If the calculation results meet the preset standards, the volume and weight of the composite target simulation system are optimized. Module M4: Add a turntable, perform wave absorption on the turntable, calculate the static field characteristics, and if the calculation results do not meet the preset standards, optimize the volume and weight and then repeatedly trigger module M4. If the calculation results meet the preset standards, the stray suppression process is complete.

7. The composite field characteristic optimization system based on spurious suppression and aberration compensation according to claim 6, characterized in that, In module M1: Module M1.1: The main structure of the offset parabolic surface is designed according to the quiet zone size requirements, and the surface accuracy of the parabolic surface meets the reflection requirements within the optical wavelength range; Module M1.2: Design the feed antenna according to the radio frequency signal band and polarization requirements. Position the feed antenna at the focal point of the offset parabolic surface. Add a beamforming lens to the front end of the feed antenna. The size of the beamforming lens covers the infrared incident angle field of view and the outer contour of the antenna. Module M1.3: An infrared imaging simulator chip is placed below the offset parabolic surface, and the optical path is turned to the area below the offset parabolic surface by a beamforming compound lens; Module M1.4: Adds an aberration compensation lens group between the beamforming compound lens and the infrared imaging simulator chip to compensate for the aberrations caused by the single offset parabolic surface; Module M1.5: Evaluates the infrared imaging quality in optical software. If the speckles in all fields of view of the obtained system dot plot are smaller than the size of 1 pixel of the infrared imaging simulator chip, then the usage requirements are met. If the obtained system dot plot has a dot size greater than or equal to 1 pixel of the infrared imaging simulator chip, the trigger module M1.4 will redesign the aberration compensation lens group. Module M1.6: Edge processing of the off-feed parabolic surface, including curling or jagged edges.

8. The composite field characteristic optimization system based on spurious suppression and aberration compensation according to claim 6, characterized in that, In module M2: The feed antenna is designed in conjunction with the beamforming composite lens and the offset parabolic surface. The infrared imaging simulator chip and aberration compensation lens group are covered with absorbing material. Commercial electromagnetic software is used to calculate the set static field amplitude and phase fluctuation.

9. The composite field characteristic optimization system based on spurious suppression and aberration compensation according to claim 6, characterized in that, In module M3: The amplitude and phase distributions of all points in the plane are fitted. If the phase fluctuation in the plane where the calculated static field rotation center is located is greater than or equal to 10° in the X and Ku bands or greater than or equal to 22° in the Ka band or greater than or equal to 1dB, the maximum value of the difference between the amplitude or phase value in the plane and the amplitude and phase difference of the corresponding point on the fitted surface is taken as the amplitude and phase fluctuation. Fourier transform is performed on the phase distribution curve to obtain the angular position information. The corresponding abnormal phase distribution points are processed with absorbing materials. If the phase fluctuation within the plane where the calculated static field rotation center is located is less than 10° in the X and Ku bands and less than 22° in the Ka band, and the amplitude fluctuation is less than 1dB, then volume and weight optimization is performed.

10. The composite field characteristic optimization system based on spurious suppression and aberration compensation according to claim 6, characterized in that, In module M4: Add a turntable structure, perform wave absorption treatment on the turntable, apply wave absorbing material or coat with wave absorbing paint, and perform static field characteristic calculations on the turntable. If the phase fluctuation within the plane where the calculated static field rotation center is located is less than 10° and the amplitude fluctuation is less than 1dB, the stray suppression processing of the entire simulation system is completed.

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