Electromagnetic compatibility design method for airborne electronic equipment

Abstract

The invention belongs to the technical field of electromagnetic compatibility design, and particularly relates to an electromagnetic compatibility design method for airborne electronic equipment, which is used for quickly positioning an electromagnetic standard exceeding circuit in an electromagnetic compatibility design stage of the airborne electronic equipment. According to the method, the complete machine-level electromagnetic compatibility can be rapidly analyzed in the prototype sample stage of the airborne electronic product, and the design is effectively optimized. The electromagnetic compatibility design method for the complete machine-level airborne electronic equipment combining the far field and the near field is short in analysis and verification time, and the electromagnetic compatibility design efficiency of the airborne electronic equipment and the passing rate of product test authentication are effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic compatibility design, and in particular relates to an electromagnetic compatibility design method for airborne electronic equipment. Background Art

[0002] Electromagnetic compatibility is a major technical problem in the current avionics field. The non-standardization and customization of avionics equipment make it difficult to implement the industry's electromagnetic compatibility design rules. Avionics pursues high safety and reliability, has a short development cycle, and has tight scientific research tasks, so there is an urgent need for one-time electromagnetic compatibility passing.

[0003] In the aviation field, multiple modules of electronic equipment are developed jointly by multiple units. It is common that a single module passes the electromagnetic test and is successfully delivered, but the electromagnetic compatibility of the whole machine exceeds the standard in the joint test, and rectification is difficult to start. When the electromagnetic compatibility of the whole machine exceeds the standard, the conventional practice is to rectify the frequency points of the exceeding standards for multiple modules at the same time, but it is impossible to accurately point to the exceeding location, resulting in blind rectification and a large waste of manpower and time. This will bring unprecedented pressure to the development cost and development cycle of avionics products.

[0004] Therefore, there is an urgent need for a technical method that can reduce the development cost and development cycle of the electromagnetic design of the entire avionics product. Summary of the invention

[0005] In view of this, the present invention provides an electromagnetic compatibility design method for airborne electronic equipment, which can realize the rapid design of product electromagnetic compatibility and the rapid positioning and rectification of electromagnetic excesses, so as to solve the problems of difficult electromagnetic compatibility design of the whole airborne electronic equipment and low one-time pass rate, and can improve the electromagnetic compatibility design efficiency of avionics equipment.

[0006] The technical solution of the present invention is:

[0007] An electromagnetic compatibility design method for airborne electronic equipment, used to quickly locate electromagnetic over-standard circuits during the electromagnetic compatibility design stage of airborne electronic equipment;

[0008] The design method comprises the following steps:

[0009] S101: sorting the modules in the airborne electronic device based on electromagnetic radiation risk, and measuring the near-field electromagnetic radiation value of each module according to the sorting;

[0010] S102: Finding the maximum value of the near-field direction extreme value of the electromagnetic radiation of each module in each of the near-field electromagnetic radiations;

[0011] S103: taking the maximum value of each of the near-field direction extreme values ​​as the maximum value of the near-field electromagnetic radiation of each module and comparing it with the first threshold;

[0012] S104: When the maximum value of the near-field electromagnetic radiation exceeds the first threshold, the corresponding module is marked as a near-field radiation exceeding standard module.

[0013] Furthermore, after S104, the step further includes:

[0014] S105: Analyze the electromagnetic radiation spectrum of the near-field radiation exceeding the standard module, find out the exceeding standard frequency points exceeding the threshold, and locate the exceeding standard circuit in the exceeding standard module based on the exceeding standard frequency points.

[0015] Furthermore, after S103, the step further includes:

[0016] S201: When the maximum electromagnetic radiation value of each module is less than the first threshold, the near-field electromagnetic radiation value of each module is cascaded to the simulation model of the airborne electronic device, and then the simulation model of the airborne electronic device is subjected to far-field electromagnetic simulation to obtain the far-field electromagnetic radiation value of the airborne electronic device;

[0017] S202: Finding the maximum value of the far-field direction extreme value of the far-field electromagnetic radiation value as the maximum value of the electromagnetic radiation of the airborne electronic device and comparing it with a second threshold;

[0018] S203: If the maximum value of the electromagnetic radiation of the airborne electronic device exceeds a second threshold, analyze the radiation spectrum of the airborne electronic device to locate the circuit with excessive far-field radiation.

[0019] Furthermore, the sorting method in S101 is:

[0020] The clock circuit, power conversion circuit and external interface circuit of each module in the airborne electronic device are sorted according to the number of electromagnetic radiation risk points inside the module, and the near-field electromagnetic radiation value of each module is measured respectively according to the sorting.

[0021] Furthermore, the sorting method is:

[0022] Set weighting points, where the clock circuit weighting coefficient is 0.4, the power conversion circuit weighting coefficient is 0.3, and the external interface circuit weighting coefficient is 0.3;

[0023] Assuming that the module includes X clock circuits, Y power conversion circuits, and Z external interface circuits, the near-field electromagnetic radiation risk value of the module is 0.4*X+0.3*Y+0.3*Z.

[0024] Furthermore, in S102, the specific method of finding the maximum value of the near-field direction extreme value of the electromagnetic radiation of the module is:

[0025] Compare the values ​​of the near-field electromagnetic radiation in the horizontal polarization direction and the vertical polarization direction.

[0026] Furthermore, in S201, the method of cascading the near-field electromagnetic radiation value of each module to the simulation model of the airborne electronic device is specifically:

[0027] Construct a topological relationship between the modules to form a cross-linking relationship diagram of the module's clock, power supply and interface, which includes the input and output of the power supply, the input and output of the clock, and the input and output of the bus; based on the cross-linking relationship, import the near-field electromagnetic radiation value of each module into the simulation model of the airborne electronic equipment, and connect the near-field electromagnetic radiation values ​​of each module through the motherboard.

[0028] Beneficial effects of the present invention:

[0029] (1) The present invention can determine whether the electromagnetic radiation of a single module exceeds the standard, discover the problem of electromagnetic radiation exceeding the standard in advance, and quickly locate and rectify it.

[0030] (2) The present invention can improve the electromagnetic simulation accuracy of the whole machine, and use the real single-module near-field electromagnetic radiation data as the simulation radiation excitation source instead of the ideal electromagnetic radiation excitation source.

[0031] (3) The present invention can realize closed-loop verification of simulation testing and form an electromagnetic simulation test closed-loop verification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a flow chart for the implementation of electromagnetic compatibility design methods for airborne electronic equipment;

[0034] Figure 2 It is a block diagram of a typical electromagnetic compatibility design system. DETAILED DESCRIPTION

[0035] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0036] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0037] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0038] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The illustrations only show components related to the present disclosure rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0039] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0040] In one embodiment of the present invention, an electromagnetic compatibility design method for airborne electronic equipment is provided, which is used to quickly locate electromagnetic exceeding standard circuits during the electromagnetic compatibility design stage of airborne electronic equipment;

[0041] See also Figure 1-Figure 2 The design method comprises the following steps:

[0042] S101: sorting the modules in the airborne electronic device based on electromagnetic radiation risk, and measuring the near-field electromagnetic radiation value of each module according to the sorting;

[0043] S102: Finding the maximum value of the near-field direction extreme value of the electromagnetic radiation of each module in each of the near-field electromagnetic radiations;

[0044] S103: taking the maximum value of each of the near-field direction extreme values ​​as the maximum value of the near-field electromagnetic radiation of each module and comparing it with the first threshold;

[0045] S104: When the maximum value of the near-field electromagnetic radiation exceeds the first threshold, the corresponding module is marked as a near-field radiation exceeding standard module.

[0046] In this embodiment, after S104, the following steps are further performed:

[0047] S105: Analyze the electromagnetic radiation spectrum of the near-field radiation exceeding the standard module, find out the exceeding standard frequency points exceeding the threshold, and locate the exceeding standard circuit in the exceeding standard module based on the exceeding standard frequency points.

[0048] In this embodiment, after S103, the following steps are further performed:

[0049] S201: When the maximum electromagnetic radiation value of each module is less than the first threshold, the near-field electromagnetic radiation value of each module is cascaded to the simulation model of the airborne electronic device, and then the simulation model of the airborne electronic device is subjected to far-field electromagnetic simulation to obtain the far-field electromagnetic radiation value of the airborne electronic device;

[0050] S202: Finding the maximum value of the far-field direction extreme value of the far-field electromagnetic radiation value as the maximum value of the electromagnetic radiation of the airborne electronic device and comparing it with a second threshold;

[0051] S203: If the maximum value of the electromagnetic radiation of the airborne electronic device exceeds a second threshold, analyze the radiation spectrum of the airborne electronic device to locate the circuit with excessive far-field radiation.

[0052] In this embodiment, the sorting method in S101 is:

[0053] The clock circuit, power conversion circuit and external interface circuit of each module in the airborne electronic device are sorted according to the number of electromagnetic radiation risk points inside the module, and the near-field electromagnetic radiation value of each module is measured respectively according to the sorting.

[0054] In this embodiment, the sorting method is:

[0055] Set weighting points, where the clock circuit weighting coefficient is 0.4, the power conversion circuit weighting coefficient is 0.3, and the external interface circuit weighting coefficient is 0.3;

[0056] Assuming that the module includes X clock circuits, Y power conversion circuits, and Z external interface circuits, the near-field electromagnetic radiation risk value of the module is 0.4*X+0.3*Y+0.3*Z.

[0057] In this embodiment, in S102, the specific method of finding the maximum value of the near-field direction extreme value of the electromagnetic radiation of the module is:

[0058] Compare the values ​​of the near-field electromagnetic radiation in the horizontal polarization direction and the vertical polarization direction.

[0059] In this embodiment, in S201, the method of cascading the near-field electromagnetic radiation value of each module to the simulation model of the airborne electronic device is specifically as follows:

[0060] Construct a topological relationship between the modules to form a cross-linking relationship diagram of the module's clock, power supply and interface, which includes the input and output of the power supply, the input and output of the clock, and the input and output of the bus; based on the cross-linking relationship, import the near-field electromagnetic radiation value of each module into the simulation model of the airborne electronic equipment, and connect the near-field electromagnetic radiation values ​​of each module through the motherboard.

[0061] This embodiment mainly includes the following steps: single module near-field electromagnetic radiation collection, single module near-field electromagnetic radiation data analysis and whole machine electromagnetic radiation simulation.

[0062] Single-module near-field electromagnetic radiation acquisition collects real-time electromagnetic radiation data of multiple modules in airborne electronic equipment respectively; single-module near-field electromagnetic radiation data analysis requires collecting single-module near-field electromagnetic radiation into electromagnetic signal data for storage and analysis to obtain the peak spectrum of single-module electromagnetic radiation; whole-machine electromagnetic radiation simulation requires importing multiple single-module electromagnetic radiation data into the whole-machine chassis for signal cascading to achieve whole-machine electromagnetic radiation simulation. Utilizing the electromagnetic compatibility design method of airborne electronic equipment combining far-field and near-field of the present invention, the electromagnetic compatibility of the whole-machine level can be quickly analyzed in the initial prototype stage of airborne electronic products, and the design can be effectively optimized.

[0063] Step 1: Single module near-field electromagnetic radiation collection, using near-field automated electromagnetic radiation collection equipment to collect real-time electromagnetic radiation data from multiple modules in the airborne electronic equipment. In particular, the collection module is a module that contains electromagnetic radiation risk points, such as a module containing a clock circuit, a power supply circuit, and an external interface circuit. Single module electromagnetic radiation data collection is not required for backplane modules and adapter modules.

[0064] Step 2: Single module near-field electromagnetic radiation data analysis, the means and environment of data collection are consistent, the electromagnetic radiation data collected by a single module has horizontal comparison significance, and the modules with larger near-field radiation energy should be the first priority for structural shielding. In particular, the near-field electromagnetic radiation energy of a single module needs to be compared with the near-field radiation threshold to ensure that the single module optimizes the near-field radiation energy to meet the requirements.

[0065] Step 3: Electromagnetic radiation simulation of the whole machine. After the electromagnetic radiation of a single module meets the requirements, a simulation model of the whole machine is constructed based on the cross-linking relationship diagram of the clock, power supply and interface of each module. The near-field radiation of each module is used to collect data according to the cross-linking relationship diagram, and then the electromagnetic radiation of the whole machine is evaluated through mature commercial electromagnetic simulation software.

[0066] The following is in accordance with Figure 1 Implementation flow chart: First, analyze the whole machine design file and sort out that the whole machine includes power module, interface module, processing module and storage module. The specific components are as follows: Figure 2 As shown. Sort by the number of electromagnetic radiation risk points inside the module. The main sorting principle is: the weighting coefficient of the clock circuit is 0.4, the weighting coefficient of the power conversion circuit is 0.3, and the weighting coefficient of the external interface circuit is 0.3. Calculate the electromagnetic radiation risk points of the four modules respectively. The radiation risk point of the power module is: 0.3*3+0.3=1.2; the radiation risk point of the interface module is: 0.3*7=2.1; the radiation risk point of the processing module is: 0.3*3+0.4*2+0.3*2=2.3, and the radiation risk point of the storage module is: 0.3*2+0.4*2+0.3*1=1.7. Therefore, the near-field test sequence is processing module, interface module, storage module and power module. The maximum electromagnetic radiation spectrum of each module is obtained in turn through near-field electromagnetic scanning. Compare with the near-field radiation spectrum threshold value respectively. After passing, the whole machine signal cascade is performed for electromagnetic simulation. If it fails in the process, it is iterated through rapid rectification.

[0067] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A method for electromagnetic compatibility design of airborne electronic equipment, characterized in that: Used to quickly locate electromagnetic exceeding standard circuits during the electromagnetic compatibility design phase of airborne electronic equipment; The design method comprises the following steps: S101: sorting the modules in the airborne electronic device based on electromagnetic radiation risk, and measuring the near-field electromagnetic radiation value of each module according to the sorting; S102: Finding the maximum value of the near-field direction extreme value of the electromagnetic radiation of each module in each of the near-field electromagnetic radiations; S103: taking the maximum value of each of the near-field direction extreme values ​​as the maximum value of the near-field electromagnetic radiation of each module and comparing it with the first threshold; S104: When the maximum value of the near-field electromagnetic radiation exceeds the first threshold, the corresponding module is marked as a near-field radiation exceeding standard module.

2. The electromagnetic compatibility design method for airborne electronic equipment according to claim 1, characterized in that: After S104, the following steps are also included: S105: Analyze the electromagnetic radiation spectrum of the near-field radiation exceeding the standard module, find out the exceeding standard frequency points exceeding the threshold, and locate the exceeding standard circuit in the exceeding standard module based on the exceeding standard frequency points.

3. The electromagnetic compatibility design method for airborne electronic equipment according to claim 2, characterized in that: After S103, the following steps are also included: S201: When the maximum electromagnetic radiation value of each module is less than the first threshold, the near-field electromagnetic radiation value of each module is cascaded to the simulation model of the airborne electronic device, and then the simulation model of the airborne electronic device is subjected to far-field electromagnetic simulation to obtain the far-field electromagnetic radiation value of the airborne electronic device; S202: Finding the maximum value of the far-field direction extreme value of the far-field electromagnetic radiation value as the maximum value of the electromagnetic radiation of the airborne electronic device and comparing it with a second threshold; S203: If the maximum value of the electromagnetic radiation of the airborne electronic device exceeds a second threshold, analyze the radiation spectrum of the airborne electronic device to locate the circuit with excessive far-field radiation.

4. The electromagnetic compatibility design method for airborne electronic equipment according to claim 3, characterized in that: The sorting method in S101 is: The clock circuit, power conversion circuit and external interface circuit of each module in the airborne electronic device are sorted according to the number of electromagnetic radiation risk points inside the module, and the near-field electromagnetic radiation value of each module is measured respectively according to the sorting.

5. The electromagnetic compatibility design method for airborne electronic equipment according to claim 4, characterized in that: The sorting method is: Set weighting points, where the clock circuit weighting coefficient is 0.4, the power conversion circuit weighting coefficient is 0.3, and the external interface circuit weighting coefficient is 0.3; Assuming that the module includes X clock circuits, Y power conversion circuits, and Z external interface circuits, the near-field electromagnetic radiation risk value of the module is 0.4*X+0.3*Y+0.3*Z.

6. The electromagnetic compatibility design method for airborne electronic equipment according to claim 5, characterized in that: In S102, the specific method of finding the maximum value of the near-field direction extreme value of the electromagnetic radiation of the module is: Compare the values ​​of the near-field electromagnetic radiation in the horizontal polarization direction and the vertical polarization direction.

7. The electromagnetic compatibility design method for airborne electronic equipment according to claim 6, characterized in that: In S201, the method of cascading the near-field electromagnetic radiation value of each module to the simulation model of the airborne electronic device is specifically as follows: Build the topological relationship between modules and form a cross-link diagram of the module's clock, power supply, and interface. The cross-link diagram includes the input and output of the power supply, the input and output of the clock, and the input and output of the bus. According to the cross-linking relationship, the near-field electromagnetic radiation value of each module is introduced into the simulation model of the airborne electronic device, and the near-field electromagnetic radiation value of each module is connected through the motherboard.

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