CN113092878B - Test method and detection device for electromagnetic radiation of W-band environment - Google Patents
Test method and detection device for electromagnetic radiation of W-band environment Download PDFInfo
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- CN113092878B CN113092878B CN202110347310.0A CN202110347310A CN113092878B CN 113092878 B CN113092878 B CN 113092878B CN 202110347310 A CN202110347310 A CN 202110347310A CN 113092878 B CN113092878 B CN 113092878B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0878—Sensors; antennas; probes; detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
Abstract
The application provides a method and a device for testing electromagnetic radiation of a W-band environment, wherein the testing method comprises the following steps: and selecting a receiving antenna and a frequency spectrograph, and connecting the receiving antenna and the frequency spectrograph through a connector. The receiving antenna is placed in the test area. Electromagnetic waves are emitted into the test area by a radiation source to be tested. And adjusting the position of the receiving antenna and detecting the electromagnetic radiation power. And calculating various parameters in the test area according to the electromagnetic radiation power, wherein the parameters comprise power density, electric field intensity and magnetic field intensity. According to the test method provided by the application, the radiation source emits the electromagnetic wave of the W waveband, the antenna electromagnetic wave is received, the spectrometer detects the current electromagnetic radiation power, and the power density, the electric field strength and the magnetic field strength in the test area can be calculated according to the electromagnetic radiation power and a related formula, so that the detection of the electromagnetic radiation intensity of the W waveband is realized, and the blank of the detection of the electromagnetic radiation intensity of the W waveband is made up.
Description
Technical Field
The application relates to the technical field of detection, in particular to a method and a device for testing electromagnetic radiation of a W-band environment.
Background
At present, the environmental detection department mainly uses electromagnetic detectors/electric field strength testers and other devices to perform electromagnetic spectrum monitoring and other work on electromagnetic radiation/electric field strength/magnetic field strength in space, and such devices need to be equipped with probes of corresponding frequency bands when in use. The highest working frequency of the high-frequency-band field intensity measuring instrument on the market reaches 60GHz. The monitoring of the electromagnetic radiation intensity of the frequency of 60GHz at the maximum can be realized. However, a dedicated meter for a higher frequency band (for example, a W band (75 GHz to 110 GHz)) is not available. At present, the working frequency of the radar for backing car is 77GHz. Therefore, testing for W-band electromagnetic radiation is increasingly important.
Disclosure of Invention
The application aims to provide a test method and a detection device which are convenient to operate and enable an operator to quickly obtain the electromagnetic radiation intensity of a W-band environment.
In order to achieve at least one of the above objectives, an embodiment of the first aspect of the present application provides a method for testing electromagnetic radiation in a W-band environment, including the following steps:
selecting a receiving antenna and a frequency spectrograph, and connecting the receiving antenna and the frequency spectrograph through a connector;
placing a receiving antenna in a test area;
emitting electromagnetic waves into a test area through a radiation source to be tested;
adjusting the position of a receiving antenna, and detecting the electromagnetic radiation power;
calculating all parameters in the test area according to the electromagnetic radiation power, wherein all parameters comprise power density, electric field intensity and magnetic field intensity;
calculating the power density, electric field strength and magnetic field strength in the test area according to the following formulas:
s is power density, P is electromagnetic radiation power, L is insertion loss of the connector, A e In order to obtain the effective receiving area of the receiving antenna, G is the gain of the receiving antenna, λ is the wavelength of the received electromagnetic wave, | E | is the scalar of the electric field E, | H | is the magnetic field strength.
In some of these embodiments, after said calculating parameters in the test area from the electromagnetic radiation power comprises the steps of:
closing the radiation source, keeping the position of the receiving antenna, and detecting background electromagnetic radiation power;
calculating various parameters in the test area according to the background electromagnetic radiation power, wherein the parameters comprise power density, electric field intensity and magnetic field intensity;
and comparing each parameter calculated according to the background electromagnetic radiation power with each parameter calculated according to the electromagnetic radiation power, and determining whether each parameter calculated according to the electromagnetic radiation power is accurate.
In some embodiments, the method further comprises, before the selecting and connecting the receiving antenna with the spectrometer, the steps of:
adjusting a linear polarization antenna to be horizontally polarized to detect electromagnetic waves emitted by a radiation source and generate a first frequency spectrum distribution map;
adjusting the linear polarization antenna to be vertical polarization to detect the electromagnetic wave emitted by the radiation source and generate a second frequency spectrum distribution map;
and judging the polarization mode of the electromagnetic wave according to the first spectrum distribution diagram and the second spectrum distribution diagram.
In some embodiments, the determining the polarization mode of the electromagnetic wave according to the first spectrum distribution map and the second spectrum distribution map specifically includes:
comparing the first spectrum distribution diagram with the second spectrum distribution diagram;
at the frequency point with the highest power, when the power of the horizontally polarized electromagnetic wave and the vertically polarized electromagnetic wave is unchanged, judging that the electromagnetic wave is circularly polarized;
when the frequency point has frequency spectrum under the left-hand circular polarization or the right-hand circular polarization, judging that the electromagnetic wave is left-hand circular polarization or right-hand circular polarization;
when the frequency point has frequency spectrum under horizontal polarization or vertical polarization, the electromagnetic wave is judged to be horizontal polarization or vertical polarization.
In some embodiments, the adjusting the position of the receiving antenna and performing the electromagnetic radiation power detection specifically includes:
and adjusting the receiving antenna to the position with the maximum electromagnetic radiation power, and detecting the electromagnetic radiation power.
An embodiment of a second aspect of the present application provides a device for testing electromagnetic radiation in a W-band environment, including: a receiving antenna; the frequency spectrograph is connected with the receiving antenna through a connector; the adjusting device is used for adjusting the position of the receiving antenna; the control device is connected with the adjusting device and is used for controlling the starting and stopping of the adjusting device; and the data processing device is connected with the frequency spectrograph and used for calculating all parameters in the test area according to the electromagnetic radiation power collected by the frequency spectrograph, wherein all the parameters comprise power density, electric field intensity and magnetic field intensity.
In some embodiments, the receiving antenna comprises a linear polarization receiving antenna, a left-hand circular polarization receiving antenna, and a right-hand circular polarization receiving antenna.
In some of these embodiments, the test device further comprises: and the data judgment device is connected with the data processing device and is used for judging whether each parameter calculated according to the background electromagnetic radiation power is accurate or not according to each parameter calculated according to the background electromagnetic radiation power and each parameter calculated according to the electromagnetic radiation power.
In some of these embodiments, the test device further comprises: and the filtering device is arranged between the receiving antenna and the frequency spectrograph and is used for filtering clutter.
The above technical scheme of this application has following advantage: the problem that the existing W-band electromagnetic radiation intensity is lack of a special detection mode can be solved, and the blank of W-band electromagnetic radiation intensity detection is made up; in addition, the detection mode is simple, the operation is convenient, an operator can quickly obtain the electromagnetic radiation intensity of the W-waveband environment, the test accuracy of the electromagnetic radiation intensity is high, different radiation sources can be distinguished according to the frequency spectrum of received electromagnetic waves, and the radiation intensity of each electromagnetic radiation source can be visually compared under the condition that a plurality of electromagnetic radiation sources exist.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration only and are not necessarily drawn to scale or quantity with respect to the actual product. Wherein:
FIG. 1 is a schematic structural diagram of a first embodiment of a testing device according to the present application;
FIG. 2 is a schematic structural diagram of a second embodiment of the test apparatus of the present application;
FIG. 3 is a schematic structural diagram of a third embodiment of the testing device of the present application.
Wherein, the correspondence between the reference numbers and the part names of fig. 1 to 3 is:
a receiving antenna 10, a frequency spectrograph 20, an adjusting device 30, a control device 40, a data processing device 50, a data judging device 60, a filtering device 70 and a radiation source 80.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. 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.
The following discussion provides a number of embodiments of the application. While each embodiment represents a single combination of applications, the various embodiments of the disclosure may be substituted or combined in any combination, and thus, the disclosure is intended to include all possible combinations of the same and/or different embodiments of what is described. Thus, if one embodiment comprises A, B, C and another embodiment comprises a combination of B and D, this application should also be considered to include an embodiment that includes one or more of all other possible combinations of A, B, C, D, although this embodiment may not be explicitly recited in text below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.
The embodiment of the first aspect of the present application provides a method for testing electromagnetic radiation in a W-band environment, including the following steps:
and S10, selecting a receiving antenna and a frequency spectrograph, and connecting the receiving antenna and the frequency spectrograph through a connector.
Step S20, placing the receiving antenna in the test area.
And step S30, emitting electromagnetic waves into the test area through the radiation source to be tested.
And S40, adjusting the position of the receiving antenna and detecting the electromagnetic radiation power. Step S40 specifically includes: and adjusting the receiving antenna to the position with the maximum electromagnetic radiation power, and detecting the electromagnetic radiation power.
And S50, calculating all parameters in the test area according to the electromagnetic radiation power, wherein all parameters comprise power density, electric field intensity and magnetic field intensity.
Calculating the power density, electric field strength and magnetic field strength in the test area according to the following formulas:
s is power density, P is electromagnetic radiation power, L is insertion loss of the connector, A e In order to obtain the effective receiving area of the receiving antenna, G is the gain of the receiving antenna, λ is the wavelength of the received electromagnetic wave, | E | is the scalar of the electric field E, | H | is the magnetic field strength.
According to the test method provided by the application, the radiation source emits electromagnetic waves in a W wave band, the receiving antenna receives the electromagnetic waves in the W wave band, the frequency spectrograph detects the current electromagnetic radiation power, and the power density, the electric field strength and the magnetic field strength in the test area can be calculated according to the electromagnetic radiation power and a related formula, so that the detection of the electromagnetic radiation intensity in the W wave band is realized, the problem that the conventional W wave band electromagnetic radiation intensity lacks a special measurement method can be solved, and the blank of the detection of the electromagnetic radiation intensity in the W wave band is made up.
In addition, the detection method is simple and convenient to operate, an operator can quickly obtain the electromagnetic radiation intensity of the W-band environment, the electromagnetic radiation intensity testing accuracy is high, different radiation sources can be distinguished according to the frequency spectrum of received electromagnetic waves, and the radiation intensity of each electromagnetic radiation source can be visually compared under the condition that a plurality of electromagnetic radiation sources exist.
The derivation of the above formula is as follows:
calculation of electromagnetic radiation power density: reading of frequency spectrograph at certain frequency point
P＝SA e -L (1)
In the formula (1), P is the electromagnetic radiation power, S is the electromagnetic power density of the measured area, L is the insertion loss of the connector, A e Is the effective receiving area of the receiving antenna.
A e The gain of the receiving antenna and the wavelength of the received electromagnetic wave can be expressed as:
in the formula (2), G is the gain of the receiving antenna, and λ is the wavelength of the received electromagnetic wave.
Substituting formula (2) into formula (1) yields:
the electromagnetic power density S of the measured area can be calculated by the formula (3). According to the theorem of slope Yin Ting:
S＝E×H (4)
in the formula (4), S represents a vector of power density, E represents a vector of electric field, and H represents a vector of magnetic field.
Under far field conditions, the voltage vector and the magnetic field vector are perpendicular to each other, and the scalar calculation formula of S is as follows:
|E|＝377|H| (6)
in the formula (5), S is the power density and has the unit of W/m 2 And 377 is the space wave impedance.
In the formula (6), | E | represents the scalar quantity of the electric field E, and represents the voltage intensity, and the unit is V/m. And | H | is the magnetic field intensity and has the unit of A/m.
The electric field intensity | E | and the magnetic field intensity | H | of the measured area can be calculated by substituting S obtained by the calculation of the formula (3) into the formula (5) and the formula (6).
In one embodiment of the present application, the following steps are included after step S40:
and S60, turning off the radiation source, keeping the position of the receiving antenna, and detecting the background electromagnetic radiation power.
And S70, calculating all parameters in the test area according to the background electromagnetic radiation power, wherein all parameters comprise power density, electric field intensity and magnetic field intensity.
And S80, comparing each parameter calculated according to the background electromagnetic radiation power with each parameter calculated according to the electromagnetic radiation power, and determining whether each parameter calculated according to the electromagnetic radiation power is accurate.
Background electromagnetic radiation refers to electromagnetic radiation originally existing in human living environment, and mainly comprises cosmic rays and rays emitted by natural radionuclides in the nature. And comparing each parameter of the body calculated according to the background electromagnetic radiation power with each detected parameter calculated according to the electromagnetic radiation power at the same position, and when the difference between each parameter of the body and each detected parameter is not great, judging that the radiation source does not emit W-band electromagnetism and each parameter detected as the background electromagnetic radiation. When the difference between each parameter of the body and each detected parameter is large, the radiation source can be judged to emit W-waveband electromagnetism. By the detection method, the influence of background electromagnetic radiation on the detection accuracy is effectively avoided, so that the detection accuracy is ensured.
In one embodiment of the present application, step S10 is preceded by the steps of:
and S01, adjusting the linear polarization antenna to be horizontally polarized to detect the electromagnetic waves emitted by the radiation source, and generating a first frequency spectrum distribution map.
And S02, adjusting the linear polarization antenna to be vertical polarization to detect the electromagnetic wave emitted by the radiation source, and generating a second frequency spectrum distribution map.
And step S03, judging the polarization mode of the electromagnetic wave according to the first frequency spectrum distribution diagram and the second frequency spectrum distribution diagram.
The electromagnetic wave emitted by the radiation source can be detected by means of horizontal polarization or vertical polarization of the linear polarization antenna, and then the receiving antenna which is the same as the polarization mode of the electromagnetic wave emitted by the radiation source is adopted to receive the electromagnetic wave, so that the receiving antenna can effectively receive the electromagnetic wave. The polarization mode of the antenna refers to the direction of the electric field intensity formed when the antenna radiates.
In an embodiment of the present application, step S03 specifically includes:
step S31, comparing the first spectrum distribution map and the second spectrum distribution map.
Step S32, at the frequency point with the highest power, when the power of the horizontally polarized and vertically polarized electromagnetic waves is not changed, it is determined that the electromagnetic waves are circularly polarized.
Step S33, when the frequency point has frequency spectrum under the left-hand circular polarization or the right-hand circular polarization, the electromagnetic wave is judged to be left-hand circular polarization or right-hand circular polarization.
And step S34, when the frequency point has a frequency spectrum under horizontal polarization or vertical polarization, judging that the electromagnetic wave is horizontal polarization or vertical polarization.
When the electromagnetic wave emitted by the radiation source is horizontally polarized, the linearly polarized antenna is horizontally polarized and can detect a frequency spectrum, and the linearly polarized antenna is vertically polarized and cannot detect the frequency spectrum. Similarly, when the electromagnetic wave emitted by the radiation source is vertically polarized, the linearly polarized antenna is vertically polarized and can detect the frequency spectrum, and the linearly polarized antenna is horizontally polarized and cannot detect the frequency spectrum. When the electromagnetic wave emitted by the radiation source is circularly polarized, the linear polarization antenna can detect the frequency spectrum for vertical polarization and horizontal polarization, and the power of the vertical polarization and the power of the horizontal polarization are basically the same at a certain frequency point. When the electromagnetic wave emitted by the radiation source is left-handed circular polarized, the linear polarized antenna can detect the frequency spectrum for left-handed circular polarized, and the linear polarized antenna can not detect the frequency spectrum for right-handed circular polarized. Similarly, when the electromagnetic wave emitted by the radiation source is right-hand circular polarization, the spectrum can be detected when the linearly polarized antenna is right-hand circular polarization, and the spectrum cannot be detected when the linearly polarized antenna is left-hand circular polarization.
As shown in fig. 1, an embodiment of the second aspect of the present application provides a device for testing electromagnetic radiation in a W-band environment, including: a receiving antenna 10, a spectrometer 20, an adjusting device 30, a control device 40 and a data processing device 50.
The spectrometer 20 is connected to the receiving antenna 10 by a connector.
The receiving antenna 10 is arranged on an adjusting device 30, and the adjusting device 30 is used for adjusting the position of the receiving antenna 10.
The control device 40 is connected to the adjustment device 30 and is configured to control the start and stop of the adjustment device 30.
The data processing device 50 is connected to the spectrometer 20, and is configured to calculate parameters in the test area according to the electromagnetic radiation power collected by the spectrometer 20, where the parameters include power density, electric field strength, and magnetic field strength.
According to the testing device provided by the application, a radiation source 80 emits electromagnetic waves in a W wave band, a receiving antenna 10 receives the electromagnetic waves in the W wave band, a frequency spectrograph 20 detects the current electromagnetic radiation power, and the power density, the electric field strength and the magnetic field strength in a testing area can be calculated according to the electromagnetic radiation power and a related formula, so that the detection of the electromagnetic radiation intensity in the W wave band is realized, the problem that the conventional electromagnetic radiation intensity in the W wave band lacks a special measuring device can be solved, and the blank of the detection of the electromagnetic radiation intensity in the W wave band is made up; in addition, the detection device is simple and convenient to operate, an operator can quickly obtain the electromagnetic radiation intensity of the W-band environment, the electromagnetic radiation intensity testing accuracy is high, different radiation sources 80 can be distinguished according to the frequency spectrum of received electromagnetic waves, and the radiation intensity of each electromagnetic radiation source 80 can be visually compared under the condition that a plurality of electromagnetic radiation sources 80 exist.
In one embodiment of the present application, the receiving antenna includes a linear polarization receiving antenna, a left-hand circular polarization receiving antenna, and a right-hand circular polarization receiving antenna.
The polarization receiving antenna can receive horizontally polarized electromagnetic waves and vertically polarized electromagnetic waves, the left-hand circular polarization receiving antenna can receive left-hand circular polarization electromagnetic waves, and the right-hand circular polarization receiving antenna can receive right-hand circular polarization electromagnetic waves. When the electromagnetic wave emitted from the radiation source 80 is horizontally polarized, the spectrum can be detected by the linearly polarized antenna being horizontally polarized, and the spectrum cannot be detected by the linearly polarized antenna being vertically polarized. Similarly, when the electromagnetic wave emitted from the radiation source 80 is vertically polarized, the spectrum can be detected by the linearly polarized antenna being vertically polarized, and the spectrum cannot be detected by the linearly polarized antenna being horizontally polarized. When the electromagnetic wave emitted by the radiation source 80 is circularly polarized, the linearly polarized antenna can detect the frequency spectrum by vertical polarization and horizontal polarization, and the power of the vertical polarization and the power of the horizontal polarization are basically the same at a certain frequency point. When the electromagnetic wave emitted by the radiation source 80 is left-handed circular polarized, the spectrum can be detected when the linear polarized antenna is left-handed circular polarized, and the spectrum cannot be detected when the linear polarized antenna is right-handed circular polarized. Similarly, when the electromagnetic wave emitted by the radiation source 80 is right-hand circular polarized, the spectrum can be detected when the linearly polarized antenna is right-hand circular polarized, and the spectrum cannot be detected when the spectrum is left-hand circular polarized.
As shown in fig. 1, in one embodiment of the present application, the testing apparatus further includes: and a data determination device 60.
The data determining device 60 is connected to the data processing device 50, and is configured to determine whether each parameter calculated according to the background electromagnetic radiation power is accurate according to each parameter calculated according to the electromagnetic radiation power and each parameter calculated according to the electromagnetic radiation power.
The background electromagnetic radiation power is measured at the same position, then each parameter of the body calculated according to the background electromagnetic radiation power is compared with each detected parameter calculated according to the electromagnetic radiation power, when the difference between each parameter of the body and each detected parameter is not a few, it can be judged that the radiation source 80 does not emit W-band electromagnetic waves, and each parameter of the background electromagnetic radiation is detected. When the difference between each parameter of the body and each detected parameter is large, it can be determined that the radiation source 80 emits electromagnetic waves of the W band. By the detection method, the influence of background electromagnetic radiation on the detection accuracy is effectively avoided, so that the detection accuracy is ensured. Background electromagnetic radiation refers to electromagnetic radiation originally existing in human living environment, and mainly comprises cosmic rays and rays emitted by natural radionuclides in the nature.
As shown in fig. 3, in one embodiment of the present application, the testing apparatus further includes: a filtering means 70.
A filtering means 70 is provided between the receiving antenna 10 and the spectrometer 20 for filtering clutter.
The filtering device 70 can filter out the noise waves, so as to ensure the detection accuracy of the spectrometer 20, thereby avoiding the influence of the noise waves on the detection result and ensuring the detection accuracy.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application. In this application, the term "plurality" means two or more unless explicitly defined otherwise. In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (3)
1. A method for testing electromagnetic radiation of a W-band environment is characterized by comprising the following steps:
selecting a receiving antenna and a frequency spectrograph, and connecting the receiving antenna and the frequency spectrograph through a connector;
placing a receiving antenna in a test area;
emitting electromagnetic waves into a test area through a radiation source to be tested;
adjusting the position of a receiving antenna, and detecting the electromagnetic radiation power;
calculating all parameters in the test area according to the electromagnetic radiation power, wherein all parameters comprise power density, electric field intensity and magnetic field intensity;
calculating the power density, electric field strength and magnetic field strength in the test area according to the following formulas:
s is power density, P is electromagnetic radiation power, L is insertion loss of the connector, A e The effective receiving area of the receiving antenna, G the gain of the receiving antenna, lambda the wavelength of the received electromagnetic wave, | E | the scalar of the electric field E, | H | the magnetic field intensity;
before selecting the receiving antenna and the frequency spectrograph and connecting the receiving antenna and the frequency spectrograph, the method comprises the following steps:
adjusting a linear polarization antenna to be horizontally polarized to detect electromagnetic waves emitted by a radiation source and generate a first frequency spectrum distribution map;
adjusting the linear polarization antenna to be vertical polarization to detect the electromagnetic wave emitted by the radiation source and generate a second frequency spectrum distribution map;
judging the polarization mode of the electromagnetic wave according to the first frequency spectrum distribution diagram and the second frequency spectrum distribution diagram;
the determining the polarization mode of the electromagnetic wave according to the first spectrum distribution map and the second spectrum distribution map specifically includes:
comparing the first spectrum distribution diagram with the second spectrum distribution diagram;
at the frequency point with the highest power, when the power of the horizontally polarized electromagnetic wave and the vertically polarized electromagnetic wave is unchanged, judging that the electromagnetic wave is circularly polarized;
when the frequency point has frequency spectrum under the left-hand circular polarization or the right-hand circular polarization, judging that the electromagnetic wave is left-hand circular polarization or right-hand circular polarization;
when the frequency point has frequency spectrum under horizontal polarization or vertical polarization, the electromagnetic wave is judged to be horizontal polarization or vertical polarization.
2. The test method according to claim 1,
the method comprises the following steps after calculating each parameter in the test area according to the electromagnetic radiation power: closing the radiation source, keeping the position of the receiving antenna, and detecting background electromagnetic radiation power;
calculating various parameters in the test area according to the background electromagnetic radiation power, wherein the parameters comprise power density, electric field intensity and magnetic field intensity;
and comparing each parameter calculated according to the background electromagnetic radiation power with each parameter calculated according to the electromagnetic radiation power, and determining whether each parameter calculated according to the electromagnetic radiation power is accurate.
3. The test method according to claim 1,
the adjusting the position of the receiving antenna and the detecting the electromagnetic radiation power specifically comprise:
and adjusting the receiving antenna to the position with the maximum electromagnetic radiation power, and detecting the electromagnetic radiation power.
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