CN109412715B - System and method for testing electromagnetic interference of quantization index of airborne communication radio frequency receiving equipment - Google Patents
System and method for testing electromagnetic interference of quantization index of airborne communication radio frequency receiving equipment Download PDFInfo
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- H04B17/00—Monitoring; Testing
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- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
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- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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- H04B7/00—Radio transmission systems, i.e. using radiation field
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Abstract
The application belongs to the technical field of electromagnetic compatibility testing of airborne communication radio frequency receiving equipment, and particularly relates to a quantitative index electromagnetic interference testing system and a quantitative index electromagnetic interference testing method for airborne communication radio frequency receiving equipment. A test system, comprising: the radio frequency signal output device is used for generating a radio frequency signal with adjustable intensity and outputting the radio frequency signal; an aircraft under test, comprising: the system comprises airborne communication radio frequency receiving equipment and one or more other airborne equipment, wherein any other airborne equipment becomes an electromagnetic interference source of the airborne communication radio frequency receiving equipment after being started; a radio frequency signal measurement device; a receiving antenna capable of receiving the radio frequency signal output by the radio frequency signal output device; the receiving antenna has: in the installation state, the receiving antenna is installed on the airborne communication radio frequency receiving equipment; and in the measuring state, the receiving antenna is connected with the radio frequency signal measuring device. The testing method is based on the testing system, and the using performance of the airplane airborne communication radio frequency receiving equipment can be more scientifically evaluated.
Description
Technical Field
The application belongs to the technical field of electromagnetic compatibility testing of airborne communication radio frequency receiving equipment, and particularly relates to a quantitative index electromagnetic interference testing system and a quantitative index electromagnetic interference testing method for airborne communication radio frequency receiving equipment.
Background
In the whole-airplane electromagnetic compatibility mutual interference check test for the airplane, because the airborne communication radio frequency receiving equipment is influenced by the external electromagnetic environment and the performance of the analog signal equipment, although the receiving sensitivity performance index of the radio frequency communication receiving equipment can be known, the index quantification of the electromagnetic interference problem in the whole-airplane electromagnetic compatibility mutual interference check test is difficult.
At present, the electromagnetic interference is directly evaluated according to the response condition generated by the radio frequency receiving equipment, the evaluation mode is only to evaluate the airborne communication radio frequency receiving equipment from the function aspect, if the performance aspect is considered, the evaluation mode is not accurate, how to quantify the electromagnetic interference index of the airborne communication radio frequency receiving equipment, and the evaluation of the electromagnetic interference condition of the airborne communication radio frequency equipment from the performance index is thoroughly difficult in the current airplane test.
Accordingly, a technical solution is desired to overcome or at least alleviate at least one of the above-mentioned drawbacks of the prior art.
Disclosure of Invention
The present application is directed to an electromagnetic interference testing system and a testing method thereof for quantifying indicators of an airborne communication radio frequency receiving device, so as to overcome or alleviate at least one of the above problems.
The technical scheme of the application is as follows:
one aspect provides a system for testing quantization index electromagnetic interference of airborne communication radio frequency receiving equipment, comprising:
the radio frequency signal output device is used for generating a radio frequency signal with adjustable intensity and outputting the radio frequency signal;
an aircraft under test, comprising: the system comprises airborne communication radio frequency receiving equipment and one or more other airborne equipment, wherein any other airborne equipment becomes an electromagnetic interference source of the airborne communication radio frequency receiving equipment after being started;
a radio frequency signal measurement device;
a receiving antenna capable of receiving the radio frequency signal output by the radio frequency signal output device; the receiving antenna has:
in the installation state, the receiving antenna is installed on the airborne communication radio frequency receiving equipment;
and in the measuring state, the receiving antenna is connected with the radio-frequency signal measuring device, and the radio-frequency signal measuring device is used for measuring the strength of the radio-frequency signal received by the receiving antenna.
Preferably, the test system further comprises an anechoic chamber;
the radio frequency signal output device, the airplane to be tested, the radio frequency signal measuring device and the receiving antenna are arranged in the anechoic chamber.
Preferably, the wave-absorbing material is laid on the inner surface of the anechoic chamber.
Preferably, the test system further comprises:
a control chamber in which a controller is arranged;
the surface of the trench is coated with a protective layer and communicated with the anechoic chamber and the control chamber;
and the cable penetrates through the trench, one end of the cable is connected with the airplane to be tested, and the other end of the cable is connected with the controller.
Preferably, the test system further comprises:
the hydraulic pipe penetrates through the trench, one end of the hydraulic pipe is connected with the airplane to be tested, and the other end of the hydraulic pipe is connected with the hydraulic excitation equipment;
and the ventilation pipe penetrates through the trench, one end of the ventilation pipe is connected with the airplane to be tested, and the other end of the ventilation pipe is connected with the ventilation excitation equipment.
Preferably, the radio frequency signal output means includes:
the airborne communication radio frequency receiving equipment simulator is used for generating radio frequency signals;
the adjustable attenuator is connected with the airborne communication radio frequency receiving equipment simulator and is used for adjusting the intensity of the radio frequency signal generated by the airborne communication radio frequency receiving equipment simulator;
and the transmitting antenna is connected with the adjustable attenuator and outputs the radio-frequency signal adjusted by the adjustable attenuator.
Preferably, the radio frequency signal measuring device includes:
the preamplifier is used for reducing the noise of the radio-frequency signal received by the receiving antenna when the receiving antenna is in a measuring state;
and the spectrum analyzer is connected with the preamplifier and is used for measuring the radio-frequency signal with noise reduced by the preamplifier to obtain the intensity of the radio-frequency signal.
On the other hand, the application also provides a method for testing the quantization index electromagnetic interference of the airborne communication radio frequency receiving equipment, and the system for testing the quantization index electromagnetic interference of the airborne communication radio frequency receiving equipment comprises the following steps:
step one, obtaining a radio frequency signal required by a receiving sensitivity index of airborne communication radio frequency receiving equipment of an airplane to be tested;
step two, obtaining the power-on receiving sensitivity on the basis of the step one, and obtaining the power-on sensitivity according to the power-on receiving sensitivity; wherein the content of the first and second substances,
the power-on receiving sensitivity refers to the intensity of the minimum radio frequency signal responded by the airborne communication radio frequency receiving equipment after the airplane to be tested is powered on;
the power-on sensitivity is the difference value between the power-on receiving sensitivity and the receiving sensitivity of the airborne communication radio frequency receiving equipment;
step three, obtaining the power-on and interference receiving sensitivity on the basis of the step two, and obtaining the power-on and interference sensitivity according to the power-on and interference receiving sensitivity; wherein the content of the first and second substances,
the power-on and interference receiving sensitivity refers to the strength of the minimum radio frequency signal responded by the airborne communication radio frequency receiving equipment after the airplane to be tested is powered on and any one of other airborne equipment is started;
the power-on and interference sensitivity is the difference value between the power-on and interference receiving sensitivity and the receiving sensitivity of the airborne communication radio frequency receiving equipment.
Preferably, the first step is specifically:
connecting a receiving antenna with a preamplifier, and setting the resolution bandwidth of a spectrum analyzer according to the receiving resolution bandwidth of the airborne communication radio frequency receiving equipment;
and starting the simulator of the airborne communication radio frequency receiving equipment, and gradually adjusting the adjustable attenuator to enable the radio frequency signal intensity measured by the spectrum analyzer to be consistent with the sensitivity index requirement of the airborne communication radio frequency receiving equipment.
Preferably, the second step is specifically:
mounting a receiving antenna to an airborne communication radio frequency receiving device, and powering on an airplane to be tested;
if the airborne communication radio frequency receiving equipment responds, the power-on receiving sensitivity is equal to the receiving sensitivity of the airborne communication radio frequency receiving equipment, and the power-on sensitivity is zero;
if the airborne communication radio frequency receiving equipment does not respond, gradually adjusting the adjustable attenuator to enable the intensity of the radio frequency signal output by the transmitting antenna to be gradually increased until the airborne communication radio frequency receiving equipment responds; then, the airplane to be tested is powered off, the receiving antenna is connected with the preamplifier, the intensity of the radio frequency signal measured by the spectrum analyzer is the power-on receiving sensitivity, and the difference value between the power-on receiving sensitivity and the receiving sensitivity of the airborne communication radio frequency receiving equipment is calculated to obtain the power-on sensitivity; then, the receiving antenna is installed on the airborne communication radio frequency receiving equipment, and the airplane to be tested is powered on.
Preferably, the third step is specifically:
turning on one other onboard device;
if the airborne communication radio frequency receiving equipment responds, the electrifying and interference receiving sensitivity is equal to the electrifying receiving sensitivity, and the difference value between the electrifying and interference receiving sensitivity and the receiving sensitivity of the airborne communication radio frequency receiving equipment is calculated to obtain the electrifying and interference sensitivity;
if the airborne communication radio frequency receiving equipment does not respond, gradually adjusting the adjustable attenuator to enable the intensity of the radio frequency signal output by the transmitting antenna to be gradually increased until the airborne communication radio frequency receiving equipment responds; and then, powering off the airplane to be tested, connecting the receiving antenna with a preamplifier, measuring the intensity of the radio frequency signal obtained by the spectrum analyzer into electrifying and interference receiving sensitivity, and calculating the difference value between the electrifying and interference receiving sensitivity and the receiving sensitivity of the airborne communication radio frequency receiving equipment to obtain the electrifying and interference sensitivity.
The application has at least the following beneficial technical effects: the test system and the test method thereof can realize quantitative test on the electromagnetic interference indexes of the airborne communication radio frequency receiving equipment in an aircraft electromagnetic compatibility mutual interference check test, and quantitatively evaluate the sensitivity criterion of the airborne communication radio frequency receiving equipment so as to more scientifically evaluate the service performance of the airborne communication radio frequency receiving equipment of the aircraft.
Drawings
FIG. 1 is a schematic structural diagram of an electromagnetic interference test system for quantitative indicators of airborne communication radio frequency receiving equipment according to the present application;
fig. 2 is a flowchart of a method for testing electromagnetic interference of quantization indexes of an airborne communication radio frequency receiving device according to the present application.
Fig. 3 is a flowchart of a first step of the method for testing the quantitative indicator electromagnetic interference of the airborne communication radio frequency receiving device according to the present application.
Fig. 4 is a flowchart of a second step of the method for testing the quantitative indicator electromagnetic interference of the airborne communication radio frequency receiving device.
Fig. 5 is a flowchart of a third step of the method for testing electromagnetic interference of the quantitative index of the airborne communication radio frequency receiving device.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present application and for simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the scope of the present application.
The present application is described in further detail below with reference to fig. 1-2.
An airborne communication radio frequency receiving equipment quantization index electromagnetic interference test system comprises:
the radio frequency signal output device is used for generating a radio frequency signal with adjustable intensity and outputting the radio frequency signal;
an aircraft under test 12, comprising: the system comprises airborne communication radio frequency receiving equipment and one or more other airborne equipment, wherein any other airborne equipment becomes an electromagnetic interference source of the airborne communication radio frequency receiving equipment after being started;
a radio frequency signal measurement device;
a receiving antenna 1 capable of receiving the radio frequency signal output by the radio frequency signal output device; the receiving antenna 1 includes:
in the installation state, the receiving antenna 1 is installed on the airborne communication radio frequency receiving equipment;
and in the measuring state, the receiving antenna 1 is connected with a radio frequency signal measuring device, and the radio frequency signal measuring device is used for measuring the intensity of the radio frequency signal received by the receiving antenna 1.
Furthermore, the test system also comprises an anechoic chamber 1; the radio frequency signal output device, the airplane to be tested 12, the radio frequency signal measuring device and the receiving antenna 1 are arranged inside the anechoic chamber 2. The anechoic chamber 2 is arranged to isolate the interference of external electromagnetic signals.
Furthermore, the wave-absorbing material 3 is laid on the inner surface of the anechoic chamber 2 to reduce the reflection and refraction effects of the radio-frequency signals in the anechoic chamber 2, so as to simulate a clean electromagnetic environment.
Further, the test system further includes: a control chamber in which a controller is arranged; the surface of the trench 4 is coated with a protective layer and communicated with the anechoic chamber 2 and the control chamber; and the cable penetrates through the trench 4, one end of the cable is connected with the airplane 12 to be tested, and the other end of the cable is connected with the controller.
Further, the test system further includes: the hydraulic pipe 5 penetrates through the trench 4, one end of the hydraulic pipe is connected with the airplane 12 to be tested, and the other end of the hydraulic pipe is connected with the hydraulic excitation equipment; and the ventilation pipe 6 penetrates through the trench 4, one end of the ventilation pipe is connected with the airplane 12 to be tested, and the other end of the ventilation pipe is connected with ventilation excitation equipment.
Further, the radio frequency signal output device includes: the airborne communication radio frequency receiving equipment simulator 7 is used for generating radio frequency signals; the adjustable attenuator 8 is connected with the airborne communication radio frequency receiving equipment simulator 7 and is used for adjusting the intensity of the radio frequency signal generated by the airborne communication radio frequency receiving equipment simulator 7; and the transmitting antenna 9 is connected with the adjustable attenuator 8 and outputs the radio-frequency signal adjusted by the adjustable attenuator 8.
Further, the radio frequency signal measuring apparatus includes: the preamplifier 10 is used for reducing the noise of the radio frequency signal received by the receiving antenna 1 when the receiving antenna 1 is in a measuring state; and the spectrum analyzer 11 is connected with the preamplifier 10 and is used for measuring the radio frequency signal with noise reduced by the preamplifier 10 to obtain the intensity of the radio frequency signal.
A method for testing electromagnetic interference of quantization indexes of airborne communication radio frequency receiving equipment comprises the following steps:
step one, obtaining a radio frequency signal required by a receiving sensitivity index of an airborne communication radio frequency receiving device of an airplane 12 to be tested;
step two, obtaining the power-on receiving sensitivity on the basis of the step one, and obtaining the power-on sensitivity according to the power-on receiving sensitivity; wherein the content of the first and second substances,
the power-on receiving sensitivity refers to the strength of the minimum radio frequency signal responded by the airborne communication radio frequency receiving equipment after the airplane 12 to be tested is powered on;
the power-on sensitivity is the difference value between the power-on receiving sensitivity and the receiving sensitivity of the airborne communication radio frequency receiving equipment;
step three, obtaining the power-on and interference receiving sensitivity on the basis of the step two, and obtaining the power-on and interference sensitivity according to the power-on and interference receiving sensitivity; wherein the content of the first and second substances,
the power-on and interference receiving sensitivity refers to the strength of the minimum radio frequency signal that the airborne communication radio frequency receiving equipment responds after the aircraft 12 to be tested is powered on and any one of other airborne equipment is started;
the power-on and interference sensitivity is the difference value between the power-on and interference receiving sensitivity and the receiving sensitivity of the airborne communication radio frequency receiving equipment.
Further, the first step is specifically as follows: connecting the receiving antenna 1 with a preamplifier 10, and setting the resolution bandwidth of a spectrum analyzer 11 according to the receiving resolution bandwidth of the airborne communication radio frequency receiving equipment; and starting the simulator 7 of the airborne communication radio frequency receiving equipment, and gradually adjusting the adjustable attenuator 8 to enable the radio frequency signal intensity measured by the spectrum analyzer 11 to be consistent with the sensitivity index requirement of the airborne communication radio frequency receiving equipment.
Further, the second step is specifically as follows: mounting the receiving antenna 1 to an airborne communication radio frequency receiving device, and powering on the airplane 12 to be tested; if the airborne communication radio frequency receiving equipment responds, the power-on receiving sensitivity is equal to the receiving sensitivity of the airborne communication radio frequency receiving equipment, and the power-on sensitivity is zero; if the airborne communication radio frequency receiving equipment does not respond, gradually adjusting the adjustable attenuator 8 to enable the intensity of the radio frequency signal output by the transmitting antenna 9 to be gradually increased until the airborne communication radio frequency receiving equipment responds; then, the airplane 12 to be tested is powered off, the receiving antenna 1 is connected with the preamplifier 10, the intensity of the radio frequency signal measured by the spectrum analyzer 11 is the power-on receiving sensitivity, and the difference value between the power-on receiving sensitivity and the receiving sensitivity of the airborne communication radio frequency receiving equipment is calculated to obtain the power-on sensitivity; then, the receiving antenna 1 is mounted to the on-board communication radio frequency receiving device, and the aircraft 12 to be tested is powered on.
Further, the third step is specifically: turning on one other onboard device; if the airborne communication radio frequency receiving equipment responds, the electrifying and interference receiving sensitivity is equal to the electrifying receiving sensitivity, and the difference value between the electrifying and interference receiving sensitivity and the receiving sensitivity of the airborne communication radio frequency receiving equipment is calculated to obtain the electrifying and interference sensitivity;
if the airborne communication radio frequency receiving equipment does not respond, gradually adjusting the adjustable attenuator 8 to enable the intensity of the radio frequency signal output by the transmitting antenna 9 to be gradually increased until the airborne communication radio frequency receiving equipment responds; and then, powering off the airplane 12 to be tested, connecting the receiving antenna 1 with the preamplifier 10, measuring the intensity of the radio frequency signal by the spectrum analyzer 11 to obtain the power-on and interference receiving sensitivity, and calculating the difference value between the power-on and interference receiving sensitivity and the receiving sensitivity of the airborne communication radio frequency receiving equipment to obtain the power-on and interference sensitivity.
In the method, the electric sensitivity, the power-on sensitivity and the interference sensitivity are used as quantitative indexes of the electromagnetic interference test of the airborne communication radio frequency receiving equipment, so that the quantitative test of the electromagnetic interference indexes of the airborne communication radio frequency receiving equipment is realized, and the use performance of the airborne communication radio frequency receiving equipment of the airplane can be more scientifically evaluated.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (3)
1. A method for testing electromagnetic interference of quantization indexes of airborne communication radio frequency receiving equipment is characterized by comprising the following steps:
step one, obtaining a radio frequency signal required by a receiving sensitivity index of airborne communication radio frequency receiving equipment of an airplane (12) to be tested;
step two, obtaining the power-on receiving sensitivity on the basis of the step one, and obtaining the power-on sensitivity according to the power-on receiving sensitivity; wherein the content of the first and second substances,
the power-on receiving sensitivity refers to the strength of the minimum radio frequency signal responded by the airborne communication radio frequency receiving equipment after the airplane (12) to be tested is powered on;
the power-on sensitivity is the difference value between the power-on receiving sensitivity and the receiving sensitivity of the airborne communication radio frequency receiving equipment;
step three, obtaining the power-on and interference receiving sensitivity on the basis of the step two, and obtaining the power-on and interference sensitivity according to the power-on and interference receiving sensitivity; wherein the content of the first and second substances,
the power-on and interference receiving sensitivity refers to the intensity of the minimum radio frequency signal responded by the airborne communication radio frequency receiving equipment after the airplane (12) to be tested is powered on and any one of other airborne equipment is started;
the power-on and interference sensitivity is the difference value between the power-on and interference receiving sensitivity and the receiving sensitivity of the airborne communication radio frequency receiving equipment.
2. The test method according to claim 1, wherein the first step is specifically:
connecting a receiving antenna (1) with a preamplifier (10), and setting the resolution bandwidth of a spectrum analyzer (11) according to the receiving resolution bandwidth of the airborne communication radio frequency receiving equipment;
and starting the simulator (7) of the airborne communication radio frequency receiving equipment, and gradually adjusting the adjustable attenuator (8) to enable the radio frequency signal intensity measured by the spectrum analyzer (11) to be consistent with the sensitivity index requirement of the airborne communication radio frequency receiving equipment.
3. The testing method according to claim 2, wherein the second step is specifically:
mounting the receiving antenna (1) to the airborne communication radio frequency receiving equipment, and powering on the airplane (12) to be tested;
if the airborne communication radio frequency receiving equipment responds, the power-on receiving sensitivity is equal to the receiving sensitivity of the airborne communication radio frequency receiving equipment, and the power-on sensitivity is zero;
if the airborne communication radio frequency receiving equipment does not respond, gradually adjusting the adjustable attenuator (8) to enable the intensity of the radio frequency signal output by the transmitting antenna (9) to be gradually increased until the airborne communication radio frequency receiving equipment responds; then, the airplane (12) to be tested is powered off, the receiving antenna (1) is connected with the preamplifier (10), the intensity of the radio frequency signal measured by the spectrum analyzer (11) is the power-on receiving sensitivity, and the difference value between the power-on receiving sensitivity and the receiving sensitivity of the airborne communication radio frequency receiving equipment is calculated to obtain the power-on sensitivity; then, mounting the receiving antenna (1) to the airborne communication radio frequency receiving equipment, and powering on the airplane (12) to be tested;
the third step is specifically as follows:
turning on one of the other onboard devices;
if the airborne communication radio frequency receiving equipment responds, the electrifying and interference receiving sensitivity is equal to the electrifying receiving sensitivity, and the difference value between the electrifying and interference receiving sensitivity and the airborne communication radio frequency receiving equipment receiving sensitivity is calculated to obtain the electrifying and interference sensitivity;
if the airborne communication radio frequency receiving equipment does not respond, gradually adjusting the adjustable attenuator (8) to enable the intensity of the radio frequency signal output by the transmitting antenna (9) to be gradually increased until the airborne communication radio frequency receiving equipment responds; and then, the airplane (12) to be tested is powered off, the receiving antenna (1) is connected with the preamplifier (10), the intensity of the radio frequency signal measured by the spectrum analyzer (11) is the power-on and interference receiving sensitivity, and the difference value between the power-on and interference receiving sensitivity and the receiving sensitivity of the airborne communication radio frequency receiving equipment is calculated to obtain the power-on and interference sensitivity.
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| CN112379201A (en) * | 2020-11-11 | 2021-02-19 | 浙江吉利控股集团有限公司 | Electromagnetic compatibility testing system and method for vehicle |
| CN112600610B (en) * | 2020-12-09 | 2023-03-24 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Beidou communication module testing method, device, equipment and storage medium |
| CN113641186B (en) * | 2021-08-08 | 2023-11-28 | 中国航空工业集团公司沈阳飞机设计研究所 | Unmanned aerial vehicle formation radio frequency compatibility design method |
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