Layout establishment method and system of radar infrared single-dual-mode universal semi-physical simulation system

Abstract

The application provides a radar infrared single-dual-mode universal semi-physical simulation system layout establishment method and system, including the following steps: step S1: overall establishment of the system is performed, and system composition is determined; step S2: a space structure is established according to the system composition; step S3: a quiet zone characteristic analysis process is performed according to the established space structure, and a space structure layout meeting the quiet zone characteristic is obtained; and step S4: infrared imaging analysis processing is performed according to the space structure layout meeting the quiet zone characteristic, and a space structure layout meeting the infrared imaging requirement is obtained. The application effectively solves the conflict between the radar electromagnetic performance and the infrared imaging performance in the same physical space, and avoids repeated design and performance contradiction caused by only considering single performance design.

Description

Technical Field

[0001] This invention relates to the technical field of radar-infrared hardware-in-the-loop simulation, specifically to a method and system for establishing the layout of a universal radar-infrared single-mode and dual-mode hardware-in-the-loop simulation system. More particularly, it preferably relates to a method for designing the layout of a reconfigurable universal radar-infrared single-mode and dual-mode hardware-in-the-loop simulation system. Background Technology

[0002] To simultaneously simulate radar and infrared composite signals from the same object in a laboratory environment, it is necessary to simulate electromagnetic wave signals from two different frequency bands. However, since radar and infrared electromagnetic frequency bands are typically far apart, achieving radar-infrared signal composite is subject to several limitations. In an anechoic chamber environment, radar and infrared composite is primarily achieved through the physical radiation transmission of the microwave / millimeter-wave array to the center of the array sphere, i.e., the rotation center of the three-axis turntable in the anechoic chamber; the infrared target simulator radiation is reflected by the two-axis motion turntable and beam combiner, similarly reaching the rotation center of the three-axis turntable. The specific design methods for the structural layout, electromagnetic characteristics, and infrared characteristics of the equipment in the composite system have not yet been disclosed.

[0003] Chinese invention patent document CN112505643A discloses an open-loop hardware-in-the-loop simulation method and system for a radar and infrared composite seeker, relating to the field of hardware-in-the-loop simulation technology. The method includes the following steps: constructing a radar and infrared composite hardware-in-the-loop simulation system and inputting set simulation conditions; according to the simulation conditions, calling the target scene model, loading the simulation parameter configuration file and corresponding binding data, and performing hardware-in-the-loop simulation on the composite seeker; obtaining the output data of each stage of the hardware-in-the-loop simulation and processing the output data to obtain various evaluation index data; and verifying whether the various indicators of the composite seeker are normal based on the evaluation index data.

[0004] Regarding the aforementioned technologies, the inventors believe that these technologies are difficult to combine radar and infrared signals. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a method and system for establishing the layout of a general-purpose semi-physical simulation system for radar infrared single and dual modes.

[0006] The present invention provides a method for establishing the layout of a general-purpose semi-physical simulation system for radar infrared single and dual modes, comprising the following steps:

[0007] Step S1: Establish the overall system and determine its components;

[0008] Step S2: Establish the spatial structure based on the system composition;

[0009] Step S3: Based on the established spatial structure, perform quiet zone characteristic analysis to obtain a spatial structure layout that satisfies the quiet zone characteristics;

[0010] Step S4: Based on the spatial structure layout that meets the quiet zone characteristics, perform infrared imaging analysis and processing to obtain a spatial structure layout that meets the requirements of infrared imaging.

[0011] Preferably, in step S1, a beam combiner and a beam combiner positioning mechanism are inserted into the dark room, and an infrared target simulator and an infrared target simulator motion mechanism are added. The beam combiner positioning mechanism and the infrared target simulator motion mechanism are moved into or out of the dark room along a set track to establish the overall system layout and determine the system composition.

[0012] The system consists of an anechoic chamber, a three-axis turntable, a radar target array, a beam combiner, a beam combiner positioning mechanism, an infrared target simulator, and an infrared target simulator motion mechanism.

[0013] Preferably, step S2 includes the following steps:

[0014] Step S21: Set the origin of the simulation system coordinates to the rotation center of the three-axis turntable. The center of the radar target array and the rotation center of the infrared target simulator after being mirrored by the beam combiner both coincide with the rotation center of the three-axis turntable.

[0015] Step S22: Based on the geometric constraints between the radar target array specifications, infrared target simulator specifications, beam compounder specifications, and three-axis turntable specifications, give the preliminary values ​​for the system layout;

[0016] Step S23: Establish a virtual integrated 3D model of the system based on the preliminary system layout values, the structural parameters of the three-axis turntable, the structural parameters of the infrared target simulator, the structural parameters of the infrared target simulator motion mechanism, the structural parameters of the beam combiner, and the structural parameters of the beam combiner positioning mechanism.

[0017] Step S24: In the virtual integrated 3D model of the system, the object space collision interference check method is used to perform collision detection on the three-axis turntable, beam combiner, beam combiner positioning mechanism, infrared target simulator, and infrared target simulator motion mechanism in different working positions to determine whether interference occurs; if interference occurs, adjustments are made; if no interference occurs, proceed to the next step.

[0018] Preferably, step S3 includes the following steps:

[0019] Step S31: Using the anechoic chamber modeling and electromagnetic field analysis method based on the uniform geometric diffraction theory, under the condition of a pure anechoic chamber, the field characteristics of the quiet zone of the anechoic chamber are calculated for the frequency point and the position of the microwave radiating antenna, and the first calculation result is obtained.

[0020] Step S32: Based on step S31, add a three-axis turntable model to perform electromagnetic field calculations in the quiet zone of the dark room and obtain the second calculation result;

[0021] Step S33: Based on step S32, add the infrared target simulator model and the infrared target simulator motion mechanism model, perform electromagnetic field calculation in the quiet zone of the dark room, and obtain the third calculation result;

[0022] Step S34: Based on step S33, add the beam combiner model and the beam combiner positioning mechanism model, perform electromagnetic field calculation in the quiet zone of the dark room, and obtain the fourth calculation result;

[0023] Step S35: Based on step S34, the beam compounder model is edge-toothed according to the geometric diffraction theory and aperture field integral, and the electromagnetic field of the quiet zone in the dark room is calculated to obtain the fifth calculation result;

[0024] Step S36: Based on the first calculation result, the second calculation result, the third calculation result, the fourth calculation result, and the fifth calculation result, obtain the factors that affect the quiet zone characteristics of the anechoic chamber, and perform wave absorption processing on the models that do not meet the quiet zone characteristics of the anechoic chamber until all models meet the quiet zone characteristics.

[0025] Preferably, step S4 includes the following steps:

[0026] Step S41: Perform finite element mechanical analysis on the modeled beamformer and beamformer support structure to obtain the deformation δ of the infrared reflector surface;

[0027] Step S42: When the deformation δ of the infrared reflective surface meets the requirements, the point spread function is obtained by ray tracing; when the deformation δ of the infrared reflective surface does not meet the requirements, the wavefront error ΔW is obtained by the deformation δ of the infrared reflective surface, and the point spread function is obtained by physical optics analysis.

[0028] Wherein, wavefront error ΔW:

[0029]

[0030] In the formula, P represents the diameter of the circular pupil function; α represents the tilt angle; and λ represents the wavelength.

[0031] Step S43: Perform transformation analysis on the point spread function to obtain imaging aberrations; evaluate the impact of beamformer surface deformation on imaging quality based on the imaging aberrations;

[0032] If the imaging aberrations meet the requirements, the system setup ends; if the imaging aberrations do not meet the requirements, proceed to step S44.

[0033] Step S44: If the imaging aberration does not meet the requirements, a preset transparent material is selected to reconstruct the beamformer and beamformer support structure, and the process returns to step S41 until the imaging aberration meets the requirements. At the same time, if the beamformer structure is changed, the electromagnetic performance in the anechoic chamber is calculated and confirmed again to determine whether the quiet zone characteristics meet the requirements. If the quiet zone characteristics meet the requirements, the system establishment ends. If the quiet zone characteristics do not meet the requirements, the beamformer is processed until the quiet zone characteristics meet the requirements.

[0034] A layout establishment system for a general-purpose semi-physical simulation system for radar infrared single and dual modes according to the present invention includes the following modules:

[0035] Module M1: System overall setup, defining system composition;

[0036] Module M2: Establishes the spatial structure based on the system composition;

[0037] Module M3: Based on the established spatial structure, perform quiet zone characteristic analysis and processing to obtain a spatial structure layout that satisfies the quiet zone characteristics;

[0038] Module M4: Based on the spatial structure layout that meets the quiet zone characteristics, perform infrared imaging analysis and processing to obtain a spatial structure layout that meets the requirements of infrared imaging.

[0039] Preferably, in module M1, a beam combiner and a beam combiner positioning mechanism are inserted into the dark chamber, and an infrared target simulator and an infrared target simulator motion mechanism are added. The beam combiner positioning mechanism and the infrared target simulator motion mechanism are moved into or out of the dark chamber along a set track to establish the overall system layout and determine the system composition.

[0040] The system consists of an anechoic chamber, a three-axis turntable, a radar target array, a beam combiner, a beam combiner positioning mechanism, an infrared target simulator, and an infrared target simulator motion mechanism.

[0041] Preferably, module M2 includes the following modules:

[0042] Module M21: Set the origin of the simulation system coordinates to the rotation center of the three-axis turntable. The center of the radar target array and the rotation center of the infrared target simulator after being mirrored by the beam combiner both coincide with the rotation center of the three-axis turntable.

[0043] Module M22: Based on the geometric constraints between radar target array specifications, infrared target simulator specifications, beam compounder specifications, and three-axis turntable specifications, preliminary values ​​for system layout are given;

[0044] Module M23: Based on the preliminary system layout values, structural parameters of the three-axis turntable, structural parameters of the infrared target simulator, structural parameters of the infrared target simulator motion mechanism, structural parameters of the beam combiner, and structural parameters of the beam combiner positioning mechanism, a virtual integrated 3D model of the system is established.

[0045] Module M24: In the system's virtual integrated 3D model, the object space collision interference check method is used to perform collision detection on the three-axis turntable, beam combiner, beam combiner positioning mechanism, infrared target simulator, and infrared target simulator motion mechanism in the system's virtual integrated 3D model at different working positions to determine whether interference occurs; if interference occurs, adjustments are made; if no interference occurs, the next step is performed.

[0046] Preferably, module M3 includes the following modules:

[0047] Module M31: Using the anechoic chamber modeling and electromagnetic field analysis method based on the uniform geometric diffraction theory, under the condition of a pure anechoic chamber, the field characteristics of the quiet zone of the anechoic chamber are calculated for the frequency point and the position of the microwave radiating antenna, and the first calculation result is obtained.

[0048] Module M32: Based on Module M31, a three-axis turntable model is added to perform electromagnetic field calculations in the quiet zone of a dark room and obtain the second calculation result;

[0049] Module M33: Based on Module M32, an infrared target simulator model and an infrared target simulator motion mechanism model are added to perform electromagnetic field calculations in the quiet zone of the dark room and obtain the third calculation result;

[0050] Module M34: Based on Module M33, a beamformer model and a beamformer positioning mechanism model are added to perform electromagnetic field calculations in the quiet zone of the dark room, and the fourth calculation result is obtained.

[0051] Module M35: Based on Module M34, the beam compounder model is edge-toothed using geometric diffraction theory and aperture field integral, and the electromagnetic field of the quiet zone in the dark room is calculated to obtain the fifth calculation result.

[0052] Module M36: Based on the first, second, third, fourth, and fifth calculation results, obtain the factors affecting the quiet zone characteristics of the anechoic chamber, and perform wave absorption processing on the models corresponding to the factors that do not meet the quiet zone characteristics of the anechoic chamber until all models meet the quiet zone characteristics.

[0053] Preferably, module M4 includes the following modules:

[0054] Module M41: Perform finite element mechanical analysis on the modeled beamformer and its support structure to obtain the deformation δ of the infrared reflector surface;

[0055] Module M42: When the infrared reflector deformation δ meets the requirements, the point spread function is obtained through ray tracing; when the infrared reflector deformation δ does not meet the requirements, the wavefront error ΔW is obtained through the infrared reflector deformation δ, and the point spread function is obtained through physical optics analysis.

[0056] Wherein, wavefront error ΔW:

[0057]

[0058] In the formula, P represents the diameter of the circular pupil function; α represents the tilt angle; and λ represents the wavelength.

[0059] Module M43: Performs transformation analysis on the point spread function to obtain imaging aberrations; evaluates the impact of beamformer surface deformation on imaging quality based on imaging aberrations;

[0060] If the imaging aberrations meet the requirements, the system setup is complete; if the imaging aberrations do not meet the requirements, proceed to module M44.

[0061] Module M44: If the imaging aberration does not meet the requirements, a preset transparent material is selected to reconstruct the beamformer and beamformer support structure, and the process returns to module M41 until the imaging aberration meets the requirements. At the same time, if the beamformer structure is changed, the electromagnetic performance in the anechoic chamber is calculated and confirmed again to determine whether the quiet zone characteristics meet the requirements. If the quiet zone characteristics meet the requirements, the system setup ends. If the quiet zone characteristics do not meet the requirements, the beamformer is processed until the quiet zone characteristics meet the requirements.

[0062] Compared with the prior art, the present invention has the following beneficial effects:

[0063] 1. This invention first determines the overall system composition through overall design, then conducts preliminary design of equipment geometric parameters, determines the coordination and matching of system layout and related subsystem parameters, establishes a three-dimensional model, and carries out virtual assembly of three-dimensional spatial layout design to avoid and eliminate spatial interference; then, it analyzes the quiet zone characteristics of the layout in the dark room through electromagnetic calculation and optimizes the equipment's wave absorption processing to achieve feasible quiet zone performance; finally, it achieves clear infrared imaging through infrared imaging quality analysis.

[0064] 2. This invention effectively resolves the conflict between radar electromagnetic performance and infrared imaging performance in the same physical space, avoiding design iterations and performance contradictions caused by considering only a single performance aspect.

[0065] 3. The radar-infrared single-mode and dual-mode universal hardware-in-the-loop simulation system designed by this invention can be used for radar-infrared dual-mode hardware-in-the-loop simulation experiments, as well as radar single-mode hardware-in-the-loop simulation experiments and infrared single-mode hardware-in-the-loop simulation experiments. Attached Figure Description

[0066] 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:

[0067] Figure 1 This is a flowchart of the layout design method for the reconfigurable radar-infrared single- and dual-mode general-purpose hardware-in-the-loop simulation system of the present invention;

[0068] Figure 2 This is a schematic diagram of the system spatial layout parameter constraints of the present invention. Detailed Implementation

[0069] 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 protection scope of the present invention.

[0070] Embodiment 1 of this invention discloses a method for establishing the layout of a general-purpose semi-physical simulation system for radar infrared single and dual modes, such as... Figure 1 and Figure 2 As shown, it includes the following steps:

[0071] Step S1: Establish the overall system layout and determine the system composition. Insert a beamformer and beamformer positioning mechanism into the anechoic chamber, and add an infrared target simulator and infrared target simulator motion mechanism. The beamformer positioning mechanism and infrared target simulator motion mechanism are moved into or out of the anechoic chamber along a set track to establish the overall system layout and determine the system composition. The system composition includes an anechoic chamber, a three-axis turntable, a radar target array, a beamformer and support mechanism, a beamformer positioning mechanism, an infrared target simulator, and an infrared target simulator motion mechanism.

[0072] Step S2: Establish the spatial structure based on the system composition.

[0073] Step S2 includes the following steps:

[0074] Step S21: Set the origin of the simulation system coordinates to the rotation center of the three-axis turntable. The center of the radar target array and the rotation center of the infrared target simulator after being mirrored by the beam combiner both coincide with the rotation center of the three-axis turntable.

[0075] Step S22: Based on the geometric constraints between the radar target array specifications, infrared target simulator specifications, beam compounder specifications, and three-axis turntable specifications, give the preliminary values ​​for the system layout;

[0076] Step S23: Establish a virtual integrated 3D model of the system based on the preliminary system layout values, the structural parameters of the three-axis turntable, the structural parameters of the infrared target simulator, the structural parameters of the infrared target simulator motion mechanism, the structural parameters of the beam combiner, and the structural parameters of the beam combiner positioning mechanism.

[0077] Step S24: In the virtual integrated 3D model of the system, the object space collision interference check method is used to perform collision detection on the three-axis turntable, beam combiner and support structure, beam combiner positioning mechanism, infrared target simulator and infrared target simulator motion mechanism in different working positions to determine whether interference occurs; if interference occurs, adjustments are made; if no interference occurs, proceed to the next step.

[0078] Step S3: Based on the established spatial structure, perform quiet zone characteristic analysis and processing to obtain a spatial structure layout that satisfies the quiet zone characteristics.

[0079] Step S3 includes the following steps:

[0080] Step S31: Using the anechoic chamber modeling and electromagnetic field analysis method based on the uniform geometric diffraction theory, under the condition of a pure anechoic chamber, the field characteristics of the quiet zone of the anechoic chamber are calculated for the frequency point and the position of the microwave radiating antenna, and the first calculation result is obtained.

[0081] Step S32: Based on step S31, add a three-axis turntable model to perform electromagnetic field calculations in the quiet zone of the dark room and obtain the second calculation result.

[0082] Step S33: Based on step S32, add the infrared target simulator model and the infrared target simulator motion mechanism model, perform electromagnetic field calculation in the quiet zone of the dark room, and obtain the third calculation result.

[0083] Step S34: Based on step S33, add the beam combiner model and the beam combiner positioning mechanism model, perform electromagnetic field calculation in the quiet zone of the dark room, and obtain the fourth calculation result.

[0084] Step S35: Based on step S34, the beam compounder model is edge-toothed based on geometric diffraction theory and aperture field integral, and the electromagnetic field of the quiet zone in the dark room is calculated to obtain the fifth calculation result.

[0085] Step S36: Based on the first calculation result, the second calculation result, the third calculation result, the fourth calculation result, and the fifth calculation result, obtain the factors that affect the quiet zone characteristics of the anechoic chamber, and perform wave absorption processing on the models that do not meet the quiet zone characteristics of the anechoic chamber until all models meet the quiet zone characteristics.

[0086] Step S4: Based on the spatial structure layout that meets the quiet zone characteristics, perform infrared imaging analysis and processing to obtain a spatial structure layout that meets the requirements of infrared imaging.

[0087] Step S4 includes the following steps:

[0088] Step S41: Perform finite element mechanical analysis on the modeled beamformer and its support structure to obtain the deformation δ of the infrared reflector surface. The beamformer support structure is a frame structure used to hold the beamformer, and the beamformer is secured on all four sides with pressure strips. When the beamformer is small, radio-transparent materials such as plastic or fiberglass are preferred for its support structure; when the beamformer is large, and plastic or fiberglass materials cannot meet the imaging aberration requirements due to deformation, aluminum alloy is selected to cover the absorbing material.

[0089] Step S42: When the deformation δ of the infrared reflective surface meets the requirements, the point spread function is obtained by ray tracing; when the deformation δ of the infrared reflective surface does not meet the requirements, the wavefront error ΔW is obtained by the deformation δ of the infrared reflective surface, and the point spread function is obtained by physical optics analysis.

[0090] Wherein, wavefront error ΔW:

[0091]

[0092] In the formula, P represents the diameter of the circular pupil function; α represents the tilt angle; and λ represents the wavelength.

[0093] Step S43: Perform transformation analysis on the point spread function to obtain imaging aberrations; evaluate the impact of beam combiner surface deformation on imaging quality based on the imaging aberrations.

[0094] If the imaging aberrations meet the requirements, the system setup ends; if the imaging aberrations do not meet the requirements, proceed to step S44.

[0095] Step S44: If the imaging aberration does not meet the requirements, a preset transparent material is selected to reconstruct the beamformer and beamformer support structure, and the process returns to step S41 until the imaging aberration meets the requirements. At the same time, if the beamformer structure is changed, the electromagnetic performance in the anechoic chamber is calculated and confirmed again to determine whether the quiet zone characteristics meet the requirements. If the quiet zone characteristics meet the requirements, the system establishment ends. If the quiet zone characteristics do not meet the requirements, the beamformer is processed until the quiet zone characteristics meet the requirements.

[0096] This invention also provides a layout establishment system for a general-purpose semi-physical simulation system for radar and infrared single and dual modes. The layout establishment system for the general-purpose semi-physical simulation system for radar and infrared single and dual modes can be implemented by executing the process steps of the layout establishment method for the general-purpose semi-physical simulation system for radar and infrared single and dual modes. That is, those skilled in the art can understand the layout establishment method for the general-purpose semi-physical simulation system for radar and infrared single and dual modes as a preferred embodiment of the layout establishment system for the general-purpose semi-physical simulation system for radar and infrared single and dual modes.

[0097] Embodiment 1 of this invention discloses a layout establishment system for a general-purpose semi-physical simulation system for radar infrared single and dual modes, such as... Figure 1 and Figure 2 As shown, it includes the following modules:

[0098] Module M1: System overall setup and system composition determination. A beamformer and beamformer positioning mechanism are inserted into the anechoic chamber, along with an infrared target simulator and its motion mechanism. The beamformer positioning mechanism and the infrared target simulator motion mechanism are moved into or out of the anechoic chamber along a set track. This completes the overall system layout and determines the system composition. The system components include the anechoic chamber, a three-axis turntable, a radar target array, a beamformer and its support structure, the beamformer positioning mechanism, the infrared target simulator, and the infrared target simulator motion mechanism.

[0099] Module M2: Establishes the spatial structure based on the system composition.

[0100] Module M2 includes the following modules:

[0101] Module M21: Set the origin of the simulation system coordinates to the rotation center of the three-axis turntable. The center of the radar target array and the rotation center of the infrared target simulator after being mirrored by the beam combiner both coincide with the rotation center of the three-axis turntable.

[0102] Module M22: Based on the geometric constraints between radar target array specifications, infrared target simulator specifications, beam compounder specifications, and three-axis turntable specifications, preliminary values ​​for system layout are given;

[0103] Module M23: Based on the preliminary system layout values, structural parameters of the three-axis turntable, structural parameters of the infrared target simulator, structural parameters of the infrared target simulator motion mechanism, structural parameters of the beam combiner, and structural parameters of the beam combiner positioning mechanism, a virtual integrated 3D model of the system is established.

[0104] Module M24: In the system's virtual integrated 3D model, the object space collision interference check method is used to perform collision detection on the three-axis turntable, beam combiner and support structure, beam combiner positioning mechanism, infrared target simulator, and infrared target simulator motion mechanism in the system's virtual integrated 3D model at different working positions to determine whether interference occurs; if interference occurs, adjustments are made; if no interference occurs, the next operation is performed.

[0105] Module M3: Based on the established spatial structure, perform quiet zone characteristic analysis and processing to obtain a spatial structure layout that satisfies the quiet zone characteristics.

[0106] Module M3 includes the following modules:

[0107] Module M31: Using the anechoic chamber modeling and electromagnetic field analysis method based on the uniform geometric diffraction theory, under the condition of a pure anechoic chamber, the field characteristics of the quiet zone of the anechoic chamber are calculated for the frequency point and the position of the microwave radiating antenna, and the first calculation result is obtained.

[0108] Module M32: Based on Module M31, a three-axis turntable model is added to perform electromagnetic field calculations in the quiet zone of a dark room, and a second calculation result is obtained.

[0109] Module M33: Based on Module M32, an infrared target simulator model and an infrared target simulator motion mechanism model are added to perform electromagnetic field calculations in the quiet zone of the dark room and obtain the third calculation result.

[0110] Module M34: Based on Module M33, a beamformer model and a beamformer positioning mechanism model are added to perform electromagnetic field calculations in the quiet zone of the dark room, resulting in the fourth calculation result.

[0111] Module M35: Based on Module M34, the beam combiner model is edge-toothed using geometric diffraction theory and aperture field integral, and electromagnetic field calculations are performed in the quiet zone of the dark room to obtain the fifth calculation result.

[0112] Module M36: Based on the first, second, third, fourth, and fifth calculation results, obtain the factors affecting the quiet zone characteristics of the anechoic chamber, and perform wave absorption processing on the models corresponding to the factors that do not meet the quiet zone characteristics of the anechoic chamber until all models meet the quiet zone characteristics.

[0113] Module M4: Based on the spatial structure layout that meets the quiet zone characteristics, perform infrared imaging analysis and processing to obtain a spatial structure layout that meets the requirements of infrared imaging.

[0114] Module M4 includes the following modules:

[0115] Module M41: Performs finite element mechanical analysis on the modeled beamformer and its support structure to obtain the deformation δ of the infrared reflector surface.

[0116] Module M42: When the infrared reflector deformation δ meets the requirements, the point spread function is obtained through ray tracing; when the infrared reflector deformation δ does not meet the requirements, the wavefront error ΔW is obtained through the infrared reflector deformation δ, and the point spread function is obtained through physical optics analysis.

[0117] Wherein, wavefront error ΔW:

[0118]

[0119] In the formula, P represents the diameter of the circular pupil function; α represents the tilt angle; and λ represents the wavelength.

[0120] Module M43: Performs transformation analysis on the point spread function to obtain imaging aberrations; evaluates the impact of beamformer surface deformation on imaging quality based on imaging aberrations.

[0121] If the imaging aberrations meet the requirements, the system setup ends; if the imaging aberrations do not meet the requirements, then module M44 is executed.

[0122] Module M44: If the imaging aberration does not meet the requirements, a preset transparent material is selected to reconstruct the beamformer and beamformer support structure, and the process returns to module M41 until the imaging aberration meets the requirements. At the same time, if the beamformer structure is changed, the electromagnetic performance in the anechoic chamber is calculated and confirmed again to determine whether the quiet zone characteristics meet the requirements. If the quiet zone characteristics meet the requirements, the system setup ends. If the quiet zone characteristics do not meet the requirements, the beamformer is processed until the quiet zone characteristics meet the requirements.

[0123] Embodiment 2 of the present invention discloses a layout design method for a reconfigurable radar-infrared single- and dual-mode general-purpose hardware-in-the-loop simulation system, comprising the following steps:

[0124] Step 1: Using methods such as inserting a movable beam combiner and positioning mechanism into the anechoic chamber, and adding a movable infrared target simulator and motion mechanism, the overall layout design of the reconfigurable radar-infrared single and dual-mode general-purpose hardware simulation system is carried out. The system composition is determined to include a microwave anechoic chamber, a three-axis flight turntable, a radar target array, a beam combiner and positioning mechanism, and an infrared target simulator and motion mechanism.

[0125] Specifically, the overall design of the reconfigurable radar-infrared single / dual-mode universal hardware-in-the-loop simulation system aims to achieve reconfigurability within the microwave anechoic chamber. Both the beam combiner and the infrared target simulator within the anechoic chamber are movable structures, capable of being moved in and out of the chamber along a set track. When the beam combiner and positioning mechanism, along with the infrared target simulator and motion mechanism, are within the anechoic chamber, a radar-infrared composite hardware-in-the-loop simulation system is formed. When these components are removed from the anechoic chamber, a single-mode radar hardware-in-the-loop simulation system is formed. During radar-infrared composite hardware-in-the-loop simulation experiments using this structure, the infrared target simulator and motion mechanism receive commands and generate infrared radiation within a certain range of motion. The beam combiner remains stationary, reflecting the infrared radiation onto the detector under test on a three-axis turntable.

[0126] Step 2, based on the system composition, conduct two-dimensional and three-dimensional spatial structure design, including the following:

[0127] 2-1. Set the origin of the simulation system coordinates as the rotation center O of the three-axis turntable. The center of the radar target array and the center of the target motion in the infrared target simulation system are mirrored by the beam combiner to ensure that the electric axis of the radar target and the optical axis of the infrared target are aligned and both point to the rotation center of the three-axis turntable, so that they can be received by the photoelectric detector under test located on the three-axis turntable.

[0128] 2-2, as Figure 2 As shown, based on the radar array sphere radius R corresponding to the field of view angle ω FOV Instantaneous field of view θ of the infrared target simulator FOV The geometric constraints between the infrared target simulator exit pupil distance L, infrared target simulator lens aperture D, infrared target simulator motion range, beam combiner size d, beam combiner tilt angle α, beam combiner distance to seeker L1, and three-axis flight turntable motion envelope are established to create a mathematical model and provide the preliminary design values ​​for the corresponding spatial geometric layout.

[0129] Specifically, the beamformer's plane length and width must cover the radar's azimuth and elevation angles, as well as the infrared's azimuth and elevation angles. Generally, the radar's field of view is larger than the infrared's field of view; this is primarily based on satisfying the radar's field of view. The beamformer's tilt angle is generally 45°. The infrared target simulator lens aperture D is determined by the exit distance L and the instantaneous field of view θ. FOV The diameter of the entrance pupil of the detector under test is calculated; then, based on the aperture of the infrared target simulator lens, the range of motion of the infrared target simulator, the size of the beam combiner, and the motion envelope of the three-axis flight turntable, the distance from the beam combiner to the seeker is given, and the initial structural layout design in the plane is completed.

[0130] The system is centered on the rotation center of a three-axis flight turntable. The three-axis flight turntable is located on one side of the anechoic chamber, while the radar target array is located on the other side of the anechoic chamber on a sphere with radius R centered on the rotation center of the three-axis flight turntable. The beamformer and positioning mechanism are located in front of the three-axis flight turntable, tilted at 45° vertically or parallel to the ground surface. The infrared target simulator and motion mechanism are positioned along the same horizontal or vertical line as the beamformer, depending on its placement. Figure 2 As shown, the rotation center of the infrared target simulator's motion mechanism coincides with the rotation center of the three-axis flight turntable mirrored from the beam combiner. The beam combiner is tilted at 45° vertically to the ground (top view). The infrared target simulator and its motion mechanism are on the same horizontal line as the beam combiner. The beam combiner is tilted at 45° parallel to the ground (side view). In this top-down position, the infrared target simulator is obscured by the beam combiner, and the infrared target simulator and its motion mechanism are on a vertical line with the beam combiner.

[0131] 2-3. Based on the preliminary design values ​​of the system layout and the structural dimension design parameters of the three-axis turntable, infrared target simulator and motion mechanism, beam combiner positioning mechanism, etc., establish a virtual integrated three-dimensional model of the system, that is, give the corresponding three-dimensional model according to the planar relationship diagram.

[0132] 2-4. In the 3D model, the object space collision interference inspection method is used to perform collision detection on the three-axis turntable, beam combiner, infrared target simulator and motion mechanism in different working positions. If interference exists, the position, attitude, range of motion and external dimensions of the equipment are adjusted, or the radar-infrared field of view is appropriately reduced.

[0133] Step 3: If no collision relationship exists, proceed to the next step of electromagnetic calculation and absorption layout structure optimization design. This involves performing electromagnetic performance calculations and designing the absorption layout based on the established spatial structure. The spatial layout is then optimized to obtain a spatial structure layout that meets the quiet zone characteristics, as well as the absorption material laying structure. This includes the following:

[0134] 3-1. Using the anechoic chamber modeling and electromagnetic field analysis method based on the uniform geometric diffraction theory, the field characteristics of the quiet zone of the anechoic chamber are first calculated under the condition of a pure anechoic chamber (empty anechoic chamber condition) for typical frequency points and the positions of typical microwave radiating antennas. The quiet zone reflection level, field amplitude uniformity, path loss uniformity, cross polarization, etc. are obtained.

[0135] 3-2. Add a three-axis turntable model to the three-dimensional model and perform electromagnetic field calculations again in the quiet zone of the dark room.

[0136] 3-3, then add an infrared target simulator and motion mechanism model to perform electromagnetic field calculations in the quiet zone of the dark room.

[0137] 3-4. Then, add the beam combiner model and the positioning mechanism model to calculate the electromagnetic field in the quiet zone of the dark room.

[0138] 3-5. Based on geometric diffraction theory and aperture field integral, the edge teeth of the beamcomplexer are designed to obtain the edge tooth structure of the beamcomplexer, and the electromagnetic field of the quiet zone in the dark room is calculated. The edge tooth structure is mainly to optimize the electromagnetic field performance in the quiet zone, and the edge teeth are processed on the beamcomplexer with a finite size in front of the quiet zone.

[0139] 3-6. Based on the calculation results of each step above, identify the key factors affecting the quiet zone characteristics of the anechoic chamber and optimize the absorption design of the equipment layout until the quiet zone reflection level and other indicators meet the requirements. Analyze and compare the changes in quiet zone reflection level, field amplitude uniformity, path loss uniformity, and cross-polarization after multiple calculations from 3-1 to 3-5. Those with larger changes compared to the empty anechoic chamber condition are the main factors affecting the quiet zone characteristics and require absorption treatment of the structure until the impact of all models and absorption treatment on the quiet zone characteristics is within the allowable range.

[0140] Step 4, Infrared Imaging Analysis and Optimization Design, involves calculating and optimizing the infrared reflective surface. Based on satisfying the quiet zone characteristics, infrared imaging analysis is performed on the infrared portion of the spatial structure layout to optimize the optical system until a structure meeting infrared characteristics is obtained. This includes the following:

[0141] 4-1. Design and model the beamformer structure and its supporting structure. Perform finite element mechanical analysis on the beamformer structure and its supporting structure model to obtain the deformation δ of the infrared reflector surface.

[0142] 4-2. When the deformation δ is more than twice the infrared wavelength (much greater than the infrared wavelength), the point spread function is obtained by ray tracing. When the deformation is comparable to the infrared wavelength (not much greater than the infrared wavelength), the wavefront error ΔW is directly estimated by the deformation δ, and then the point spread function is obtained by physical optics analysis.

[0143] The wavefront error ΔW can be obtained by the zeroth-order approximation.

[0144]

[0145] In the formula, P is the diameter of the circular pupil function, such as 100mm, α is the tilt angle, and λ is the wavelength.

[0146] 4-3. Perform transformation analysis on the point spread function to obtain imaging aberrations and evaluate the impact of beamformer surface deformation on imaging quality; if it has no impact on imaging quality, the system design is complete.

[0147] 4-4. If the imaging aberration is too large, select wave-transparent materials such as fiberglass, epoxy resin board, and polytetrafluoroethylene for the beam combiner support structure design, and then repeat the calculation of the infrared reflector deformation and imaging quality (repeat step 4 calculation) until the imaging quality requirements are met.

[0148] 4-5. If the beamformer structure has been modified, the electromagnetic performance in the anechoic chamber must be calculated and confirmed again. If the quiet zone reflection level and other indicators meet the requirements, the design is complete. If not, the beamformer should be optimized appropriately until the quiet zone reflection level and other indicators meet the requirements.

[0149] This invention can be used for both radar-infrared dual-mode composite guidance hardware-in-the-loop simulation experiments and radar or infrared single-mode guidance hardware-in-the-loop simulation experiments. This invention discloses a layout design method for a reconfigurable radar-infrared single-mode / dual-mode universal hardware-in-the-loop simulation system. This method mainly includes four steps: overall system design, two-dimensional and three-dimensional spatial structure design, electromagnetic characteristic calculation and structural optimization, and infrared imaging analysis and optimization design. This invention is used for the layout design of reconfigurable radar-infrared universal hardware-in-the-loop simulation systems and is applicable to radar single-mode hardware-in-the-loop simulation experiments, infrared single-mode hardware-in-the-loop simulation experiments, and radar-infrared composite dual-mode hardware-in-the-loop simulation experiments.

[0150] Those skilled in the art will understand that, besides implementing the system and its various devices, modules, and units provided by this invention in the form of purely computer-readable program code, the same functions can be achieved entirely through logical programming of the method steps, making the system and its various devices, modules, and units of this invention function in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, the system and its various devices, modules, and units provided by this invention can be considered as a hardware component, and the devices, modules, and units included therein for implementing various functions can also be considered as structures within the hardware component; alternatively, the devices, modules, and units for implementing various functions can be considered as both software modules implementing the method and structures within the hardware component.

[0151] 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 establishing the layout of a general-purpose semi-physical simulation system for radar infrared single and dual modes, characterized in that, Includes the following steps: Step S1: Establish the overall system and determine its components; Step S2: Establish the spatial structure based on the system composition; Step S3: Based on the established spatial structure, perform quiet zone characteristic analysis to obtain a spatial structure layout that satisfies the quiet zone characteristics; Step S4: Based on the spatial structure layout that meets the quiet zone characteristics, perform infrared imaging analysis and processing to obtain a spatial structure layout that meets the requirements of infrared imaging. Step S4 includes the following steps: Step S41: Perform finite element mechanical analysis on the modeled beamformer and its support structure to obtain the deformation of the infrared reflector. δ ; Step S42: Deformation of the infrared reflective surface δ When the requirements are met, the point spread function is obtained through ray tracing; the deformation of the infrared reflective surface is also measured. δ If the requirements are not met, use an infrared reflective surface. δ Deformation amount to obtain wavefront error Δ W And the point spread function is obtained through physical optics analysis; Among them, wavefront error Δ W : In the formula, P α represents the diameter of the circular pupil function; α represents the tilt angle; λ represents the wavelength. Step S43: Perform transformation analysis on the point spread function to obtain imaging aberrations; evaluate the impact of beamformer surface deformation on imaging quality based on the imaging aberrations; If the imaging aberrations meet the requirements, the system setup ends; if the imaging aberrations do not meet the requirements, proceed to step S44. Step S44: If the imaging aberration does not meet the requirements, a preset transparent material is selected to reconstruct the beamformer and beamformer support structure, and the process returns to step S41 until the imaging aberration meets the requirements. At the same time, if the beamformer structure is changed, the electromagnetic performance in the anechoic chamber is calculated and confirmed again to determine whether the quiet zone characteristics meet the requirements. If the quiet zone characteristics meet the requirements, the system establishment ends. If the quiet zone characteristics do not meet the requirements, the beamformer is processed until the quiet zone characteristics meet the requirements.

2. The method for establishing the layout of a radar infrared single / dual-mode universal hardware-in-the-loop simulation system according to claim 1, characterized in that, In step S1, a beam combiner and a beam combiner positioning mechanism are inserted into the dark room, and an infrared target simulator and an infrared target simulator motion mechanism are added. The beam combiner positioning mechanism and the infrared target simulator motion mechanism are moved into or out of the dark room along a set track to establish the overall system layout and determine the system composition. The system consists of an anechoic chamber, a three-axis turntable, a radar target array, a beam combiner, a beam combiner positioning mechanism, an infrared target simulator, and an infrared target simulator motion mechanism.

3. The method for establishing the layout of a radar infrared single / dual-mode universal hardware-in-the-loop simulation system according to claim 2, characterized in that, Step S2 includes the following steps: Step S21: Set the origin of the simulation system coordinates to the rotation center of the three-axis turntable. The center of the radar target array and the rotation center of the infrared target simulator after being mirrored by the beam combiner both coincide with the rotation center of the three-axis turntable. Step S22: Based on the geometric constraints between the radar target array specifications, infrared target simulator specifications, beam compounder specifications, and three-axis turntable specifications, give the preliminary values ​​for the system layout; Step S23: Establish a virtual integrated 3D model of the system based on the preliminary system layout values, the structural parameters of the three-axis turntable, the structural parameters of the infrared target simulator, the structural parameters of the infrared target simulator motion mechanism, the structural parameters of the beam combiner, and the structural parameters of the beam combiner positioning mechanism. Step S24: In the virtual integrated 3D model of the system, the object space collision interference check method is used to perform collision detection on the three-axis turntable, beam combiner, beam combiner positioning mechanism, infrared target simulator and infrared target simulator motion mechanism in the virtual integrated 3D model of the system at different working positions to determine whether interference occurs. If interference occurs, make adjustments; if no interference occurs, proceed to the next step.

4. The method for establishing the layout of a radar infrared single / dual-mode universal hardware-in-the-loop simulation system according to claim 3, characterized in that, Step S3 includes the following steps: Step S31: Using the anechoic chamber modeling and electromagnetic field analysis method based on the uniform geometric diffraction theory, under the condition of a pure anechoic chamber, the field characteristics of the quiet zone of the anechoic chamber are calculated for the frequency point and the position of the microwave radiating antenna, and the first calculation result is obtained. Step S32: Based on step S31, add a three-axis turntable model to perform electromagnetic field calculations in the quiet zone of the dark room and obtain the second calculation result; Step S33: Based on step S32, add the infrared target simulator model and the infrared target simulator motion mechanism model, perform electromagnetic field calculation in the quiet zone of the dark room, and obtain the third calculation result; Step S34: Based on step S33, add the beam combiner model and the beam combiner positioning mechanism model, perform electromagnetic field calculation in the quiet zone of the dark room, and obtain the fourth calculation result; Step S35: Based on step S34, the beam compounder model is edge-toothed according to the geometric diffraction theory and aperture field integral, and the electromagnetic field of the quiet zone in the dark room is calculated to obtain the fifth calculation result; Step S36: Based on the first calculation result, the second calculation result, the third calculation result, the fourth calculation result, and the fifth calculation result, obtain the factors that affect the quiet zone characteristics of the anechoic chamber, and perform wave absorption processing on the models that do not meet the quiet zone characteristics of the anechoic chamber until all models meet the quiet zone characteristics.

5. A layout establishment system for a general-purpose semi-physical simulation system for radar infrared single and dual modes, characterized in that, Includes the following modules: Module M1: System overall setup, defining system composition; Module M2: Establishes the spatial structure based on the system composition; Module M3: Based on the established spatial structure, perform quiet zone characteristic analysis and processing to obtain a spatial structure layout that satisfies the quiet zone characteristics; Module M4: Based on the spatial structure layout that meets the quiet zone characteristics, perform infrared imaging analysis and processing to obtain a spatial structure layout that meets the requirements of infrared imaging. Module M4 includes the following modules: Module M41: Performs finite element mechanical analysis on the modeled beamformer and its support structure to obtain the deformation of the infrared reflector. δ ; Module M42: Deformation of Infrared Reflector Surface δ When the requirements are met, the point spread function is obtained through ray tracing; the deformation of the infrared reflective surface is also measured. δ If the requirements are not met, use an infrared reflective surface. δ Deformation amount to obtain wavefront error Δ W And the point spread function is obtained through physical optics analysis; Among them, wavefront error Δ W : In the formula, P α represents the diameter of the circular pupil function; α represents the tilt angle. λ represents wavelength; Module M43: Performs transformation analysis on the point spread function to obtain imaging aberrations; evaluates the impact of beamformer surface deformation on imaging quality based on imaging aberrations; If the imaging aberrations meet the requirements, the system setup is complete; if the imaging aberrations do not meet the requirements, proceed to module M44. Module M44: If the imaging aberration does not meet the requirements, a preset transparent material is selected to reconstruct the beamformer and beamformer support structure, and the process returns to module M41 until the imaging aberration meets the requirements. At the same time, if the beamformer structure is changed, the electromagnetic performance in the anechoic chamber is calculated and confirmed again to determine whether the quiet zone characteristics meet the requirements. If the quiet zone characteristics meet the requirements, the system setup ends. If the quiet zone characteristics do not meet the requirements, the beamformer is processed until the quiet zone characteristics meet the requirements.

6. The radar infrared single / dual-mode universal hardware-in-the-loop simulation system layout establishment system according to claim 5, characterized in that, In module M1, a beam combiner and a beam combiner positioning mechanism are inserted into the dark chamber, and an infrared target simulator and an infrared target simulator motion mechanism are added. The beam combiner positioning mechanism and the infrared target simulator motion mechanism are moved into or out of the dark chamber along a set track to establish the overall system layout and determine the system composition. The system consists of an anechoic chamber, a three-axis turntable, a radar target array, a beam combiner, a beam combiner positioning mechanism, an infrared target simulator, and an infrared target simulator motion mechanism.

7. The radar infrared single / dual-mode universal hardware-in-the-loop simulation system layout establishment system according to claim 6, characterized in that, Module M2 includes the following modules: Module M21: Set the origin of the simulation system coordinates to the rotation center of the three-axis turntable. The center of the radar target array and the rotation center of the infrared target simulator after being mirrored by the beam combiner both coincide with the rotation center of the three-axis turntable. Module M22: Based on the geometric constraints between radar target array specifications, infrared target simulator specifications, beam compounder specifications, and three-axis turntable specifications, preliminary values ​​for system layout are given; Module M23: Based on the preliminary system layout values, structural parameters of the three-axis turntable, structural parameters of the infrared target simulator, structural parameters of the infrared target simulator motion mechanism, structural parameters of the beam combiner, and structural parameters of the beam combiner positioning mechanism, a virtual integrated 3D model of the system is established. Module M24: In the virtual integrated 3D model of the system, the object space collision interference check method is used to perform collision detection on the three-axis turntable, beam combiner, beam combiner positioning mechanism, infrared target simulator and infrared target simulator motion mechanism in different working positions to determine whether interference occurs. If interference occurs, make adjustments; if no interference occurs, proceed to the next step.

8. The radar infrared single / dual-mode universal hardware-in-the-loop simulation system layout establishment system according to claim 7, characterized in that, Module M3 includes the following modules: Module M31: Using the anechoic chamber modeling and electromagnetic field analysis method based on the uniform geometric diffraction theory, under the condition of a pure anechoic chamber, the field characteristics of the quiet zone of the anechoic chamber are calculated for the frequency point and the position of the microwave radiating antenna, and the first calculation result is obtained. Module M32: Based on Module M31, a three-axis turntable model is added to perform electromagnetic field calculations in the quiet zone of a dark room and obtain the second calculation result; Module M33: Based on Module M32, an infrared target simulator model and an infrared target simulator motion mechanism model are added to perform electromagnetic field calculations in the quiet zone of the dark room and obtain the third calculation result; Module M34: Based on Module M33, a beamformer model and a beamformer positioning mechanism model are added to perform electromagnetic field calculations in the quiet zone of the dark room, and the fourth calculation result is obtained. Module M35: Based on Module M34, the beam compounder model is edge-toothed using geometric diffraction theory and aperture field integral, and the electromagnetic field of the quiet zone in the dark room is calculated to obtain the fifth calculation result. Module M36: Based on the first, second, third, fourth, and fifth calculation results, obtain the factors affecting the quiet zone characteristics of the anechoic chamber, and perform wave absorption processing on the models corresponding to the factors that do not meet the quiet zone characteristics of the anechoic chamber until all models meet the quiet zone characteristics.

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