A method for constructing an electromagnetic susceptibility effect model of an aircraft on-board communication device receiver

Abstract

The application belongs to the technical field of aircraft spectrum compatibility design, and particularly relates to a method for constructing an electromagnetic sensitivity effect model of an aircraft airborne communication equipment receiver, comprising the following steps: step one, constructing a basic theory model of a carrier-to-interference ratio threshold of the airborne communication equipment receiver in sections, which is expressed as a continuous function of interference signal frequency; step two, performing an electromagnetic sensitivity characteristic test of the airborne communication equipment receiver to obtain the carrier-to-interference ratio threshold of the airborne communication equipment receiver under different interference signal frequencies; and step three, inputting the carrier-to-interference ratio threshold of the airborne communication equipment receiver under different receiving signal frequencies into the basic theory model of the carrier-to-interference ratio threshold to perform data fitting, obtaining model parameters, and obtaining the electromagnetic sensitivity effect model.

Description

Technical Field

[0001] This application belongs to the field of aircraft spectrum compatibility design technology, specifically relating to a method for constructing an electromagnetic susceptibility effect model for an aircraft airborne communication equipment receiver. Background Technology

[0002] Electromagnetic susceptibility effect models primarily describe the receiving characteristics of electromagnetically sensitive devices, namely the frequency response characteristics of input and interference signals. Establishing a susceptibility effect model for aircraft airborne communication equipment receivers in complex electromagnetic environments, and obtaining effective and accurate susceptibility characteristics of airborne communication equipment receivers in complex electromagnetic environments, is an important basis for aircraft spectrum compatibility design and prediction.

[0003] The electromagnetic sensitivity characteristics of aircraft airborne communication equipment receivers are related not only to the receiver's own radio frequency and signal processing channel architecture, but also to the receiver's operating mode, performance indicators, anti-interference data processing software algorithms, and the types of interference signals.

[0004] Aircraft-borne communication equipment receiver circuits have complex structures, making it extremely difficult to construct circuit-level electromagnetic susceptibility effect models for predicting electromagnetic susceptibility characteristics, and circuit-level parameters are also difficult to obtain.

[0005] In view of the aforementioned technical deficiencies, this application is hereby filed. Summary of the Invention

[0006] The purpose of this application is to provide a method for constructing an electromagnetic susceptibility effect model for an aircraft airborne communication equipment receiver, so as to provide support for aircraft spectrum compatibility design and prediction.

[0007] The technical solution of this application is:

[0008] A method for constructing an electromagnetic susceptibility effect model for an aircraft airborne communication equipment receiver includes:

[0009] Step 1: Construct a segmented theoretical model of the interference-to-signal ratio threshold for the receiver of airborne communication equipment, expressed as a continuous function of the interference signal frequency:

[0010] ;

[0011] in,

[0012] The receiver interference-to-signal ratio threshold for airborne communication equipment;

[0013] The frequency of the interference signal for the airborne communication equipment receiver;

[0014] This is the operating center frequency of the receiver for airborne communication equipment.

[0015] This refers to the operating signal bandwidth of the receiver in airborne communication equipment.

[0016] These are model parameters;

[0017] Step 2: Conduct electromagnetic susceptibility tests on the receiver of the airborne communication equipment to obtain the interference-to-signal ratio threshold of the receiver under different interference signal frequencies;

[0018] Step 3: Substitute the interference-to-signal ratio (ISR) threshold values ​​of the airborne communication equipment receiver at different received signal frequencies into the basic theoretical model of ISR threshold for data fitting, obtain the model parameters, and obtain the electromagnetic susceptibility effect model.

[0019] According to at least one embodiment of this application, in the above-described method for constructing an electromagnetic susceptibility effect model for an aircraft airborne communication equipment receiver, step two specifically comprises:

[0020] A standard test signal is generated by a comprehensive tester or exciter and injected into the receiver of the airborne communication equipment through a combiner. The output level of the comprehensive tester or exciter is adjusted from small to large to enable the airborne communication equipment to be in a communicable state.

[0021] The interference signals of different frequencies and patterns are generated by the interference signal simulator, injected into the power amplifier for radiation power adjustment, and injected into the receiver of the airborne communication equipment through the combiner;

[0022] Gradually increase the power of the interference signal until the airborne communication equipment is in a state of interference, and record the power value of the interference signal;

[0023] By comparing the power value of the interference signal with the standard test signal value, the interference-to-signal ratio threshold of the airborne communication equipment receiver under different interference signal frequencies is calculated.

[0024] According to at least one embodiment of this application, in the above-described method for constructing an electromagnetic susceptibility effect model for an aircraft airborne communication equipment receiver, step two, where the airborne communication equipment is in a disturbed state, refers to abnormal communication, service, or bit error rate of the airborne communication equipment.

[0025] According to at least one embodiment of this application, in the above-described method for constructing an electromagnetic susceptibility effect model for an aircraft airborne communication equipment receiver, step three specifically comprises:

[0026] Using linear or nonlinear least squares methods, the interference-to-signal ratio (ISR) thresholds of the airborne communication equipment receiver at different received signal frequencies are substituted into the basic theoretical model of ISR thresholds for data fitting to obtain model parameters. Thus, the electromagnetic sensitivity effect model was obtained. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the electromagnetic susceptibility test system for airborne communication equipment receivers provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram comparing the prediction accuracy of the electromagnetic susceptibility effect model of the receiver of an aircraft airborne communication equipment, provided in an embodiment of this application, with actual measurement data.

[0029] To better illustrate this embodiment, some content in the accompanying drawings may be omitted, enlarged, or reduced. They are for illustrative purposes only and should not be construed as limiting the scope of this application. Detailed Implementation

[0030] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, and other related parts can be referred to the general design.

[0031] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The word "comprising" as used in this application description indicates that the concept preceding the word encompasses the concepts listed following the word and their equivalents, without excluding other related concepts.

[0032] Furthermore, the terms indicating location used in the description of this application are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation" and "connection" used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0033] This application provides a method for constructing an electromagnetic susceptibility effect model for an aircraft airborne communication equipment receiver. The method employs a fusion model of "mechanism model + measured data" to construct a parameterized electromagnetic effect model, which accurately and effectively simulates the sensitive response of the airborne communication equipment receiver under complex electromagnetic environments, providing support for aircraft spectrum compatibility design and prediction.

[0034] Step 1: Construct a basic theoretical model of the interference-to-signal ratio threshold of the receiver of the airborne communication equipment in segments, which is expressed as a continuous function of the interference signal frequency.

[0035] Based on the operating frequency of the airborne communication equipment receiver, the fundamental theoretical model of electromagnetic susceptibility effect is expressed as a continuous function of the interference signal frequency. The fundamental theoretical model of interference-to-signal ratio (ISR) thresholds is constructed segmentally according to the same-frequency ISR threshold, adjacent-frequency ISR threshold, and out-of-band ISR threshold:

[0036] ;

[0037] in,

[0038] The receiver interference-to-signal ratio threshold for airborne communication equipment;

[0039] The frequency of the interference signal for the airborne communication equipment receiver;

[0040] This is the operating center frequency of the receiver for airborne communication equipment.

[0041] This refers to the operating signal bandwidth of the receiver in airborne communication equipment.

[0042] These are model parameters, which are constants related to the receiver model and operating status of the airborne communication equipment.

[0043] Step 2: Conduct electromagnetic susceptibility tests on the airborne communication equipment receiver to obtain the interference-to-signal ratio threshold of the airborne communication equipment receiver under different interference signal frequencies.

[0044] Build a test system for the electromagnetic susceptibility characteristics of airborne communication equipment receivers, such as... Figure 1 As shown.

[0045] A standard test signal is generated by a comprehensive tester or exciter and injected into the receiver of the airborne communication equipment through a combiner. The output level of the comprehensive tester or exciter is adjusted from small to large to enable the airborne communication equipment to be in a communicable state.

[0046] Interference signals of different frequencies and patterns are generated using an interference signal simulator, injected into a power amplifier for radiation power adjustment, and then injected into the receiver of the airborne communication equipment through a combiner.

[0047] Monitor the functions of airborne communication equipment, including communication status, service status, bit error rate, and response signals.

[0048] Gradually increase the power of the interference signal until the airborne communication equipment is in a state of disruption, and record the power value of the interference signal.

[0049] By comparing the power value of the interference signal with the standard test signal value, the interference-to-signal ratio threshold of the airborne communication equipment receiver under different interference signal frequencies is calculated.

[0050] Step 3: Substitute the interference-to-signal ratio (ISR) threshold values ​​of the airborne communication equipment receiver at different received signal frequencies into the basic theoretical model of ISR threshold for data fitting, obtain the model parameters, and obtain the electromagnetic susceptibility effect model.

[0051] Linear or nonlinear least squares methods can be used to fit the interference-to-signal ratio (ISR) thresholds of the airborne communication equipment receiver at different received signal frequencies into the basic theoretical model of ISR thresholds, thereby obtaining the model parameters. Thus, the electromagnetic sensitivity effect model was obtained.

[0052] The electromagnetic susceptibility effect model construction method for the receiver of the airborne communication equipment disclosed in the above embodiments fully considers the coupled influence of multiple factors such as receiver operating mode and anti-interference processing algorithm. It adopts a method that combines mechanism model and measured data to construct the electromagnetic susceptibility effect model of the airborne communication equipment receiver in segments related to the interference frequency, thus obtaining a relatively effective and accurate electromagnetic susceptibility effect model.

[0053] In a specific example, the method for constructing an electromagnetic susceptibility effect model for an aircraft airborne communication equipment receiver disclosed in the above embodiments compares the prediction accuracy of the electromagnetic susceptibility effect model with measured data, such as... Figure 2 As shown.

[0054] Tests verified that the model accuracy using this method is better than 4dB. See the attached table for model accuracy comparison data. Figure 2 .

[0055] The technical solution of this application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A method for constructing an electromagnetic susceptibility effect model for an aircraft airborne communication equipment receiver, characterized in that, include: Step 1: Construct a segmented theoretical model of the interference-to-signal ratio threshold for the receiver of airborne communication equipment, expressed as a continuous function of the interference signal frequency: ； in, The receiver interference-to-signal ratio threshold for airborne communication equipment; The frequency of the interference signal for the airborne communication equipment receiver; This is the operating center frequency of the receiver for airborne communication equipment. This refers to the operating signal bandwidth of the receiver in airborne communication equipment. These are model parameters; Step 2: Conduct electromagnetic susceptibility tests on the receiver of the airborne communication equipment to obtain the interference-to-signal ratio threshold of the receiver under different interference signal frequencies; Step 3: Substitute the interference-to-signal ratio (ISR) threshold values ​​of the airborne communication equipment receiver at different received signal frequencies into the basic theoretical model of ISR threshold for data fitting, obtain the model parameters, and obtain the electromagnetic susceptibility effect model.

2. The method for constructing an electromagnetic susceptibility effect model for an aircraft airborne communication equipment receiver according to claim 1, characterized in that, Step two is as follows: A standard test signal is generated by a comprehensive tester or exciter and injected into the receiver of the airborne communication equipment through a combiner. The output level of the comprehensive tester or exciter is adjusted from small to large to enable the airborne communication equipment to be in a communicable state. The interference signals of different frequencies and patterns are generated by the interference signal simulator, injected into the power amplifier for radiation power adjustment, and injected into the receiver of the airborne communication equipment through the combiner; Gradually increase the power of the interference signal until the airborne communication equipment is in a state of interference, and record the power value of the interference signal; By comparing the power value of the interference signal with the standard test signal value, the interference-to-signal ratio threshold of the airborne communication equipment receiver under different interference signal frequencies is calculated.

3. The method for constructing an electromagnetic susceptibility effect model for an aircraft airborne communication equipment receiver according to claim 2, characterized in that, In step two, "the airborne communication equipment is in a disrupted state" means that the communication, services, or bit error rate of the airborne communication equipment are abnormal.

4. The method for constructing an electromagnetic susceptibility effect model for an aircraft airborne communication equipment receiver according to claim 3, characterized in that, Step three specifically involves: Using linear or nonlinear least squares methods, the interference-to-signal ratio (ISR) thresholds of the airborne communication equipment receiver at different received signal frequencies are substituted into the basic theoretical model of ISR thresholds for data fitting to obtain model parameters. Thus, the electromagnetic sensitivity effect model was obtained.

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