CN113644997B - Electromagnetic environment detection method, device and system - Google Patents

Electromagnetic environment detection method, device and system Download PDF

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CN113644997B
CN113644997B CN202111195824.5A CN202111195824A CN113644997B CN 113644997 B CN113644997 B CN 113644997B CN 202111195824 A CN202111195824 A CN 202111195824A CN 113644997 B CN113644997 B CN 113644997B
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background noise
maximum allowable
matrix
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CN113644997A (en
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叶家全
高静
邹杰
崔铠韬
梁飞
吴杰
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Second Research Institute of CAAC
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Abstract

The invention discloses a method, a device and a system for detecting an electromagnetic environment, wherein the method comprises the following steps: acquiring test parameters and test frequency spectrum data required by an electromagnetic environment test; performing fusion processing on the test frequency spectrum data to output comprehensive frequency spectrum data; and calculating the actual value of the background noise and the interference signal according to the comprehensive frequency spectrum data and the test parameters. The method can ensure the correctness and the accuracy of the electromagnetic environment test result of the site of the ground radio station (station) of the civil aviation airport to be built, and ensure the safe operation of the built aviation radio station (station), thereby providing guarantee for the safe flight of the civil aviation airplane.

Description

Electromagnetic environment detection method, device and system
Technical Field
The invention belongs to the technical field of electromagnetic environment detection, and particularly relates to an electromagnetic environment detection method, device and system.
Background
The civil aviation airport electromagnetic environment test is to test the electromagnetic environment of the airport ground aviation radio station (station) to know the electromagnetic environment condition of the proposed ground aviation radio station (station). The method aims to test whether interference signals exist around, if so, parameters such as frequency, intensity, bandwidth and the like of the interference signals are tested, the property of the interference source is analyzed according to the test result, the electromagnetic compatibility relation between the proposed station and the interference source is correctly evaluated, and a basis is provided for safe operation and frequency assignment after the airport ground aviation radio station (station) is newly built, migrated and expanded. Therefore, the quality of electromagnetic environment testing and the method of acquiring data required for proper assessment are directly related to the cost of building a site and the quality of later communications.
The electromagnetic environment testing system mainly comprises an antenna, receiving equipment (a receiver or a frequency spectrograph and the like) and auxiliary equipment (an attenuator, an amplifier and a filter) selected according to needs, wherein the testing system collects interference signals in the environment through the antenna, the intensity of the interference signals is read by the receiving equipment after low-noise amplification, and the intensity (power or field intensity) of the interference signals in the environment can be obtained after the reading is calculated in the later stage. At present, many domestic detection mechanisms carry out testing and evaluation according to related national and industrial requirements, usually adopt direct reading of test results on receiving equipment for calculation, and the result of manual reading and judgment cannot guarantee the correctness and accuracy of the test results, so that the safety evaluation of the electromagnetic environment of the civil aviation airport is influenced. Therefore, it is necessary to provide a device and a method for detecting the safety of the electromagnetic environment of a civil aviation airport, so as to solve the above problems, ensure the correctness and accuracy of the electromagnetic environment test result of the site of the ground radio station (station) of the civil aviation airport, and ensure the safe operation of the built aviation radio station (station), thereby providing a guarantee for the safe flight of the civil aviation aircraft.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an electromagnetic environment detection method, device and system, which can ensure the correctness and accuracy of an electromagnetic environment test result of a ground radio station (station) site of a civil aviation airport and ensure the safe operation of the built aviation radio station (station), thereby providing guarantee for the safe flight of a civil aviation airplane.
The purpose of the invention is realized by the following technical scheme:
an electromagnetic environment detection method, comprising the steps of:
acquiring test parameters and test frequency spectrum data required by an electromagnetic environment test;
performing fusion processing on the test frequency spectrum data to output comprehensive frequency spectrum data;
and calculating the actual value of the background noise and the interference signal according to the comprehensive frequency spectrum data and the test parameters.
Further, the fusion process adopts the following method:
Figure 959668DEST_PATH_IMAGE001
，
wherein the content of the first and second substances,
Figure 498097DEST_PATH_IMAGE002
a spectral data matrix representing the u 2 nd row n columns of spectral data S,
Figure DEST_PATH_IMAGE003
to represent
Figure 961439DEST_PATH_IMAGE004
The matrix formed by the 1 st row elements in the matrix,
Figure DEST_PATH_IMAGE005
to represent
Figure 243516DEST_PATH_IMAGE006
A matrix composed of the elements of row 2 in the matrix, an
Figure DEST_PATH_IMAGE007
，
Figure 475914DEST_PATH_IMAGE008
Wherein u =1,2, … m, m and n are positive integers;
obtaining comprehensive frequency spectrum data after fusion:
Figure DEST_PATH_IMAGE009
where s is the product of m and n,
Figure 247561DEST_PATH_IMAGE010
and
Figure DEST_PATH_IMAGE011
is a positive integer from 1 to s,
Figure 651996DEST_PATH_IMAGE012
represents H of
Figure DEST_PATH_IMAGE013
Go to the first
Figure 534502DEST_PATH_IMAGE014
Elements of a column, and
Figure DEST_PATH_IMAGE015
，
Figure 824669DEST_PATH_IMAGE016
the function indicates that the first row elements in matrix a are sorted in order from small to large, and the second row elements are sorted with the same index as the first row elements.
Further, the test parameters include a reference bandwidth, an antenna gain, an antenna factor, a radio frequency channel gain, and a resolution bandwidth.
Further, the method for calculating the interference signal is as follows:
matrix initialization, background noise
Figure DEST_PATH_IMAGE017
Of interfering signals
Figure 767217DEST_PATH_IMAGE018
First transformation matrix
Figure DEST_PATH_IMAGE019
Second transformation matrix
Figure 205151DEST_PATH_IMAGE020
Background noise mean matrix
Figure DEST_PATH_IMAGE021
The transfer matrix
Figure 829031DEST_PATH_IMAGE022
And is and
Figure DEST_PATH_IMAGE023
，
Figure 36021DEST_PATH_IMAGE024
，
Figure DEST_PATH_IMAGE025
(ii) a Wherein the content of the first and second substances,
Figure 87154DEST_PATH_IMAGE026
is composed of
Figure DEST_PATH_IMAGE027
The ith row and the jth column of (g),
Figure 12384DEST_PATH_IMAGE028
is composed of
Figure DEST_PATH_IMAGE029
The ith row and the jth column of (g),
Figure 672911DEST_PATH_IMAGE030
representing the element in row 1 and column i in Q,
Figure DEST_PATH_IMAGE031
representing the background noise mean;
calculating the mean value of the background noise values
Figure 999987DEST_PATH_IMAGE032
，
Figure DEST_PATH_IMAGE033
Where T represents the transpose of the matrix;
the matrix Q is calculated and,
Figure 18758DEST_PATH_IMAGE034
calculating the interference signal
Figure DEST_PATH_IMAGE035
And background noise
Figure 368968DEST_PATH_IMAGE036
Find all elements in the matrix Q greater than 6 db, if there is an indexed positive integer r such that
Figure DEST_PATH_IMAGE037
Then let
Figure 396967DEST_PATH_IMAGE038
Then let it
Figure DEST_PATH_IMAGE039
Finally, an interference signal is obtained
Figure 578550DEST_PATH_IMAGE035
Background noise
Figure 971485DEST_PATH_IMAGE036
；
Background noise measurement
Figure 605729DEST_PATH_IMAGE040
The calculation method of (2) is as follows:
Figure DEST_PATH_IMAGE041
，
wherein, the function max (A) represents the first maximum value in all elements of the matrix A;
the actual value of the background noise
Figure 171839DEST_PATH_IMAGE042
The calculation method of (2) is as follows:
when the background noise measures
Figure 473508DEST_PATH_IMAGE040
Has the unit of
Figure DEST_PATH_IMAGE043
Actual value of background noise
Figure 37344DEST_PATH_IMAGE044
Has the unit of
Figure DEST_PATH_IMAGE045
When the temperature of the water is higher than the set temperature,
Figure 158884DEST_PATH_IMAGE046
；
when the background noise measures
Figure 528685DEST_PATH_IMAGE040
Has the unit of
Figure DEST_PATH_IMAGE047
Actual value of background noise
Figure 121078DEST_PATH_IMAGE042
Has the unit of
Figure 918133DEST_PATH_IMAGE047
When the temperature of the water is higher than the set temperature,
Figure 526969DEST_PATH_IMAGE048
；
when the background noise measures
Figure DEST_PATH_IMAGE049
Has the unit of
Figure 434882DEST_PATH_IMAGE050
Actual value of background noise
Figure 383247DEST_PATH_IMAGE042
Has the unit of
Figure DEST_PATH_IMAGE051
When the temperature of the water is higher than the set temperature,
Figure 351203DEST_PATH_IMAGE052
；
wherein the antenna factor AF unit is
Figure DEST_PATH_IMAGE053
Gain of radio frequency channel
Figure 447335DEST_PATH_IMAGE054
Has a unit of
Figure DEST_PATH_IMAGE055
Gain of antenna
Figure 96622DEST_PATH_IMAGE056
Has a unit of
Figure DEST_PATH_IMAGE057
Reference bandwidth
Figure 961810DEST_PATH_IMAGE058
And resolution bandwidth
Figure DEST_PATH_IMAGE059
Has the unit of
Figure 38350DEST_PATH_IMAGE060
。
Further, the test parameters further include a maximum allowable interference field strength and a maximum allowable interference power, and the actual values of the interference signal and the background noise are compared with the maximum allowable interference power or the maximum allowable interference field strength to obtain a detection result of the interference signal and the background noise in the test frequency band.
Further, the step of comparing the actual values of the interference signal and the background noise with the maximum allowable interference power or the maximum allowable interference field strength to obtain the detection results of the interference signal and the background noise of the test frequency band specifically includes:
comparing the actual value of the background noise with the maximum allowable interference power or the maximum allowable interference field strength;
if the actual value of the background noise is smaller than the maximum allowable interference power or the maximum allowable interference field strength and the interference signal is a zero matrix, the detection result is that the test frequency band has no interference signal and background noise which exceed the maximum allowable interference power or the maximum allowable interference field strength;
if the actual value of the background noise is smaller than the maximum allowable interference power or the maximum allowable interference field strength and the interference signal is a non-zero matrix, listing a frequency point or a frequency band formed by non-zero elements in the first row of the interference signal matrix and a corresponding amplitude value, wherein the detection result is that the interference signal exists in the test frequency band;
if the actual value of the background noise is greater than the maximum allowable interference power or the maximum allowable interference field strength and the interference signal is a zero matrix, the detection result is that the background noise in the test frequency band exceeds the maximum allowable interference power or the maximum allowable interference field strength;
if the actual value of the background noise is greater than the maximum allowable interference power or the maximum allowable interference field strength and the interference signal is a non-zero matrix, listing a frequency point or a frequency band formed by non-zero elements in the first row of the interference signal matrix and a corresponding amplitude value, and determining that the detection result is that the interference signal exists in the test frequency band and the background noise exceeds the maximum allowable interference power or the maximum allowable interference field strength.
On the other hand, the invention also provides an electromagnetic environment detection device, which comprises an input unit and a calculation unit, wherein the input unit comprises a frequency spectrum data acquisition module and a test parameter input module, and the calculation unit comprises a data fusion module and a data processing module; wherein the content of the first and second substances,
the data fusion module is used for performing fusion processing on the test spectrum data to output comprehensive spectrum data, and the data processing module is used for calculating a background noise actual value and an interference signal according to the comprehensive spectrum data and the test parameters;
the test parameter input module is used for inputting test parameters required by electromagnetic environment detection.
Furthermore, the spectrum data acquisition module comprises a receiving antenna, the receiving antenna is connected with a preprocessor through a radio frequency cable, the preprocessor is connected with a spectrum analyzer through a radio frequency cable, the spectrum analyzer is in communication connection with the computing unit, and the preprocessor comprises an attenuator, a low noise amplifier and a filter.
Further, the device also comprises a test frequency band detection module, which is used for comparing the actual values of the interference signal and the background noise with the maximum allowable interference power or the maximum allowable interference field strength to obtain the detection results of the interference signal and the background noise of the test frequency band.
On the other hand, the invention also provides an electromagnetic environment detection system which comprises the electromagnetic environment detection device and is characterized in that the electromagnetic environment detection device is also connected with an output unit, and the output unit comprises a display module, a report generation module and a storage module; wherein the content of the first and second substances,
the display module is used for displaying the detection result of the test frequency band;
the report generation module is used for generating a uniform report document according to the detection result;
and the storage module is used for storing the detection result of the test frequency band and can be called by the terminal with the access authority to trace the result.
The invention has the beneficial effects that:
(1) the invention acquires the frequency spectrum data of the electromagnetic environment signal around the site of the proposed aviation radio station (station), and calculates and obtains the actual value of the interference signal and the background noise of the site environment of the proposed aviation radio station (station) after fusing the frequency spectrum data, thereby providing a reliable reference basis for the new construction, the transference, the extension and the like of the aviation radio station (station).
(2) The invention detects whether the interference signal and the background noise of the test frequency band exceed the standard or not by comparing the actual value of the interference signal and the background noise with the maximum allowable interference power or the maximum allowable interference field intensity, and further provides reliable basis for the safe operation and the frequency assignment after the new construction, the relocation and the expansion of the airport ground aviation radio station (station).
Drawings
Fig. 1 is a flow chart of an electromagnetic environment detection method provided in embodiment 1 of the present invention;
FIG. 2 is a flow chart of another electromagnetic environment detection method provided in embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of a frequency spectrum data input part of an electromagnetic environment detection device provided in embodiment 3 of the present invention;
fig. 4 is a schematic structural diagram of an electromagnetic environment detection system provided in embodiment 4 of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
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 invention.
Example 1
Fig. 1 is a flow chart of a method for detecting an electromagnetic environment according to this embodiment. The method specifically comprises the following steps:
the method comprises the following steps: and acquiring test parameters and test spectrum data required by the electromagnetic environment test. The test parameters required by the electromagnetic environment test comprise a reference bandwidth, an antenna gain, an antenna factor, a radio frequency channel gain and a resolution bandwidth. The test spectrum data is spectrum data of electromagnetic environment signals around the site of the planned aviation ground radio station.
Step two: and performing fusion processing on the test frequency spectrum data to output comprehensive frequency spectrum data. The fusion process adopts the following method:
spectral data
Figure DEST_PATH_IMAGE061
And (u is a positive integer), performing fusion processing, and outputting the comprehensive spectrum data H.
Figure 621778DEST_PATH_IMAGE062
，
Wherein the content of the first and second substances,
Figure 137073DEST_PATH_IMAGE002
a spectral data matrix representing the u 2 nd row n columns of spectral data S,
Figure 856767DEST_PATH_IMAGE003
to represent
Figure 602744DEST_PATH_IMAGE004
The matrix formed by the 1 st row elements in the matrix,
Figure 673468DEST_PATH_IMAGE005
to represent
Figure 726875DEST_PATH_IMAGE006
A matrix composed of the elements of row 2 in the matrix, an
Figure 566655DEST_PATH_IMAGE007
，
Figure 47315DEST_PATH_IMAGE008
Wherein u =1,2, … m, m and n are positive integers;
obtaining comprehensive frequency spectrum data after fusion:
Figure 605335DEST_PATH_IMAGE009
where s is the product of m and n,
Figure 134537DEST_PATH_IMAGE010
and
Figure 828823DEST_PATH_IMAGE011
is a positive integer from 1 to s,
Figure 745964DEST_PATH_IMAGE012
represents H of
Figure 525701DEST_PATH_IMAGE013
Go to the first
Figure 920910DEST_PATH_IMAGE014
Elements of a column, and
Figure 672965DEST_PATH_IMAGE015
，
Figure 495428DEST_PATH_IMAGE016
the function indicates that the first row elements in matrix a are sorted in order from small to large, and the second row elements are sorted with the same index as the first row elements.
Step three: and calculating the actual value of the background noise and the interference signal according to the comprehensive frequency spectrum data and the test parameters.
Matrix initialization, background noise
Figure 762461DEST_PATH_IMAGE017
Of interfering signals
Figure 961361DEST_PATH_IMAGE018
First transformation matrix
Figure 630240DEST_PATH_IMAGE019
Second transformation matrix
Figure 561287DEST_PATH_IMAGE020
Background noise mean matrix
Figure 315616DEST_PATH_IMAGE021
The transfer matrix
Figure 52628DEST_PATH_IMAGE022
And is and
Figure 576014DEST_PATH_IMAGE023
，
Figure 5858DEST_PATH_IMAGE024
，
Figure 247483DEST_PATH_IMAGE025
(ii) a Wherein the content of the first and second substances,
Figure 964684DEST_PATH_IMAGE026
is composed of
Figure 608155DEST_PATH_IMAGE027
The ith row and the jth column of (g),
Figure 943322DEST_PATH_IMAGE028
is composed of
Figure 672243DEST_PATH_IMAGE029
The ith row and the jth column of (g),
Figure 751058DEST_PATH_IMAGE030
representing the element in row 1 and column i in Q,
Figure 186718DEST_PATH_IMAGE031
representing the background noise mean;
calculating the mean value of the background noise values
Figure 958365DEST_PATH_IMAGE032
，
Figure 909004DEST_PATH_IMAGE033
Where T represents the transpose of the matrix;
the matrix Q is calculated and,
Figure 791509DEST_PATH_IMAGE034
calculating the interference signal
Figure 143993DEST_PATH_IMAGE035
And background noise
Figure 86541DEST_PATH_IMAGE036
Find all elements in the matrix Q greater than 6 db, if there is an indexed positive integer r such that
Figure 462159DEST_PATH_IMAGE037
Then let
Figure 882776DEST_PATH_IMAGE038
Then let it
Figure 355346DEST_PATH_IMAGE039
Finally, an interference signal is obtained
Figure 468795DEST_PATH_IMAGE035
Background noise
Figure 394026DEST_PATH_IMAGE036
；
Background noise measurement
Figure 556017DEST_PATH_IMAGE040
The calculation method of (2) is as follows:
Figure 617514DEST_PATH_IMAGE041
，
wherein, the function max (A) represents the first maximum value in all elements of the matrix A;
the actual value of the background noise
Figure 901865DEST_PATH_IMAGE042
The calculation method of (2) is as follows:
when the background noise measures
Figure 314391DEST_PATH_IMAGE040
Has the unit of
Figure 342390DEST_PATH_IMAGE043
Actual value of background noise
Figure 960191DEST_PATH_IMAGE044
Has the unit of
Figure 149864DEST_PATH_IMAGE045
When the temperature of the water is higher than the set temperature,
Figure 49687DEST_PATH_IMAGE046
；
when the background noise measures
Figure 615798DEST_PATH_IMAGE040
Has the unit of
Figure 917466DEST_PATH_IMAGE047
Actual value of background noise
Figure 215723DEST_PATH_IMAGE042
Has the unit of
Figure 602842DEST_PATH_IMAGE047
When the temperature of the water is higher than the set temperature,
Figure 972644DEST_PATH_IMAGE048
；
when the background noise measures
Figure 863239DEST_PATH_IMAGE049
Has the unit of
Figure 660294DEST_PATH_IMAGE050
Actual value of background noise
Figure 269130DEST_PATH_IMAGE042
Has the unit of
Figure 380305DEST_PATH_IMAGE051
When the temperature of the water is higher than the set temperature,
Figure 390987DEST_PATH_IMAGE052
；
wherein the antenna factor AF unit is
Figure 358943DEST_PATH_IMAGE053
Gain of radio frequency channel
Figure 455075DEST_PATH_IMAGE054
Has a unit of
Figure 166679DEST_PATH_IMAGE055
Gain of antenna
Figure 969550DEST_PATH_IMAGE056
Has a unit of
Figure 108407DEST_PATH_IMAGE057
Reference bandwidth
Figure 691835DEST_PATH_IMAGE058
And resolution bandwidth
Figure 941551DEST_PATH_IMAGE059
Has the unit of
Figure 926824DEST_PATH_IMAGE060
。
In the traditional detection scheme, the electromagnetic environment around the proposed aviation radio station (station) site is evaluated by directly reading the measured value of the background noise, and the electromagnetic environment detection method provided by the embodiment has higher accuracy compared with the traditional detection scheme.
According to the electromagnetic environment detection method provided by the embodiment, the spectrum data of the electromagnetic environment signals around the site of the proposed aviation radio station (station) is collected, and the spectrum data is fused and then calculated to obtain the actual values of the interference signals and the background noise of the site environment of the proposed aviation radio station (station), so that a reliable reference basis is provided for the new construction, the relocation construction, the extension construction and the like of the aviation radio station (station).
Example 2
Fig. 2 is a block flow diagram of a method for detecting an electromagnetic environment according to this embodiment. Compared with the embodiment, the method adds a further detection step for the actual values of the interference signal and the background noise of the test frequency band, and detects whether the actual values of the interference signal and the background noise of the electromagnetic environment around the proposed aviation radio station (station) can meet the station building condition.
The test parameters which need to be input at this moment include maximum allowable interference field strength and maximum allowable interference power, and the interference signal and the background noise of the test frequency band are detected according to the comparison between the actual values of the interference signal and the background noise and the maximum allowable interference power or the maximum allowable interference field strength.
Specifically, the actual value of the background noise is compared with the magnitude of the maximum allowable interference power or the maximum allowable interference field strength.
If the actual value of the background noise is smaller than the maximum allowable interference power or the maximum allowable interference field strength and the interference signal is a zero matrix, the detection result is that the interference signal and the background noise which exceed the maximum allowable interference power or the maximum allowable interference field strength do not appear in the test frequency band. The electromagnetic environment at the planned aviation radio station (station) meets the requirements and has the station setting conditions.
If the actual value of the background noise is smaller than the maximum allowable interference power or the maximum allowable interference field strength and the interference signal is a non-zero matrix, listing a frequency point or a frequency band formed by non-zero elements in the first row of the interference signal matrix and a corresponding amplitude value, and determining that the interference signal exists in the test frequency band as a detection result. The electromagnetic environment at the planned aviation radio station (station) meets the requirements and has the station setting conditions.
If the actual value of the background noise is larger than the maximum allowable interference power or the maximum allowable interference field strength and the interference signal is a zero matrix, the detection result is that the background noise in the test frequency band exceeds the maximum allowable interference power or the maximum allowable interference field strength. The electromagnetic environment at the planned aviation radio station (station) is not in accordance with the requirements, and the station condition is not met.
If the actual value of the background noise is greater than the maximum allowable interference power or the maximum allowable interference field strength and the interference signal is a non-zero matrix, listing a frequency point or a frequency band formed by non-zero elements in the first row of the interference signal matrix and a corresponding amplitude value, and determining that the detection result is that the interference signal exists in the test frequency band and the background noise exceeds the maximum allowable interference power or the maximum allowable interference field strength. The electromagnetic environment at the planned aviation radio station (station) is not in accordance with the requirements, and the station condition is not met.
Compared with the foregoing embodiments, the electromagnetic environment detection method provided in this embodiment detects whether the interference signal and the background noise in the test frequency band exceed the standard or not by comparing the actual values of the interference signal and the background noise with the maximum allowable interference power or the maximum allowable interference field strength, and further provides a reliable basis for safe operation and frequency assignment after new construction, migration and expansion of the airport ground airborne radio station (station).
Example 3
Fig. 3 is a schematic structural diagram of a spectrum data input portion of the electromagnetic environment detection apparatus provided in this embodiment. The device specifically comprises a test parameter input part, a frequency spectrum data acquisition part and an electromagnetic environment detection part. The test parameter input part is not shown in the figure and can be directly input by connecting various terminals such as a computer, a mobile phone and the like with the electromagnetic environment detection part.
The frequency spectrum data acquisition part comprises a receiving antenna, the receiving antenna is connected with a preprocessor through a radio frequency cable, the preprocessor is connected with a frequency spectrometer through the radio frequency cable, and the frequency spectrometer is in communication connection with the calculation unit. The working frequency band of the receiving antenna completely comprises a radio frequency band corresponding to the proposed station, and the polarization mode is consistent with the antenna polarization mode of the actual working of the proposed station; the preprocessor needs to be selected according to the environment of the actual test, wherein the attenuator is used for protecting the test equipment from being damaged, the low-noise amplifier is used for improving the detection rate of the interference signal, and the filter is used for filtering a high-power signal in the non-test frequency band so as to ensure the accuracy of the signal in the tested frequency band. The frequency spectrograph is used for receiving radio frequency signals transmitted by the radio frequency cable from the receiving antenna and the preprocessor, and outputting frequency spectrum data after being processed by the frequency spectrograph. The spectrometer needs to set correct test parameters, setting requirements: firstly, testing frequency bands: the radio frequency bands corresponding to the aviation ground radio station are planned to be established, including the radio frequency bands corresponding to civil aviation communication, navigation, monitoring, weather and the like; second, resolution bandwidth: 1/2, the resolution bandwidth adopted by the test is smaller than the reference bandwidth corresponding to the proposed aviation ground radio station; thirdly, the sword wave mode: the aviation ground radio station corresponding to the frequency quasi-measuring section is in a pulse working mode and adopts a peak value or quasi-peak value detection mode, and the aviation ground radio station corresponding to the frequency quasi-measuring section is in a continuous wave working mode and adopts a root mean square or average value detection mode; fourth, reference level: the background noise and the interference signal are all displayed. The electromagnetic environment computing unit comprises a data fusion module and a data processing module. The data fusion module is used for performing fusion processing on the test spectrum data to output comprehensive spectrum data, and the data processing module is used for calculating a background noise actual value and an interference signal according to the comprehensive spectrum data and the test parameters. For a specific calculation manner, reference is made to the electromagnetic environment detection method provided in the foregoing embodiment, and details are not described herein again.
The electromagnetic environment detection device also comprises a test frequency band detection module connected with the calculation unit, and the test frequency band detection module is used for detecting the interference signal and the background noise of the test frequency band according to the comparison of the actual values of the interference signal and the background noise with the maximum allowable interference power or the maximum allowable interference field strength. The input mode of the maximum allowable interference power or the maximum allowable interference field strength can be directly input by adopting a computer, a mobile phone and other terminals, and the specific numerical value of the maximum allowable interference power or the maximum allowable interference field strength is determined according to relevant specifications or standards.
The electromagnetic environment detection device provided by the embodiment can acquire the frequency spectrum data of electromagnetic environment signals around the proposed aviation radio station (station) site, and the frequency spectrum data is fused and then calculated to obtain the actual values of the interference signals and background noise of the proposed aviation radio station (station) site environment, so that a reliable reference basis is provided for new construction, migration, extension and the like of the aviation radio station (station).
Example 4
Fig. 4 is a schematic structural diagram of an electromagnetic environment detection system provided in this embodiment. The system comprises the electromagnetic environment detection device provided by the embodiment, the electromagnetic environment detection device is further connected with an output unit, and the output unit comprises a display module, a report generation module and a storage module. The display module is used for displaying the detection result of the test frequency band. And the report generating module is used for generating a uniform report document according to the detection result, and the report can be consulted or stored after being printed. And the storage module is used for storing the detection result of the test frequency band and can be called by the terminal with the access authority to trace the result.
The electromagnetic environment detection system provided by the embodiment can provide a reliable electromagnetic environment detection system for the new construction, the migration and the extension of the airport ground aviation radio station (station), and the system can provide a basis for the safe operation and the frequency assignment after the new construction, the migration and the extension of the airport ground aviation radio station (station).
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (7)

1. An electromagnetic environment detection method is characterized by comprising the following steps:
acquiring test parameters and test frequency spectrum data required by an electromagnetic environment test;
the test parameters comprise reference bandwidth, antenna gain, antenna factors, radio frequency channel gain and resolution bandwidth;
performing fusion processing on the test frequency spectrum data to output comprehensive frequency spectrum data;
the fusion treatment adopts the following method:
Figure 854310DEST_PATH_IMAGE001
，
wherein the content of the first and second substances,
Figure 214884DEST_PATH_IMAGE002
a spectral data matrix representing the u 2 nd row n columns of spectral data S,
Figure 290418DEST_PATH_IMAGE003
to represent
Figure 660220DEST_PATH_IMAGE004
The matrix formed by the 1 st row elements in the matrix,
Figure 550816DEST_PATH_IMAGE005
to represent
Figure 347870DEST_PATH_IMAGE006
A matrix composed of the elements of row 2 in the matrix, an
Figure 956706DEST_PATH_IMAGE007
，
Figure 333461DEST_PATH_IMAGE008
Wherein u =1,2, … m, m and n are positive integers;
obtaining comprehensive frequency spectrum data after fusion:
Figure 344142DEST_PATH_IMAGE009
where s is the product of m and n,
Figure 312098DEST_PATH_IMAGE010
and
Figure 408230DEST_PATH_IMAGE011
is a positive integer from 1 to s,
Figure 119834DEST_PATH_IMAGE012
represents H of
Figure 906393DEST_PATH_IMAGE013
Go to the first
Figure 45251DEST_PATH_IMAGE014
Elements of a column, and
Figure 628679DEST_PATH_IMAGE015
，
Figure 878395DEST_PATH_IMAGE016
the function indicates that the first row elements in the matrix A are sorted from small to large, and the second row elements are sorted with the same subscript as the first row elements
Calculating a background noise actual value and an interference signal according to the comprehensive frequency spectrum data and the test parameters;
the method for calculating the interference signal comprises the following steps:
matrix initialization, background noise
Figure 863668DEST_PATH_IMAGE017
Of interfering signals
Figure 111110DEST_PATH_IMAGE018
First transformation matrix
Figure 181834DEST_PATH_IMAGE019
Second transformation matrix
Figure 235241DEST_PATH_IMAGE020
Background noise mean matrix
Figure 75021DEST_PATH_IMAGE021
The transfer matrix
Figure 555681DEST_PATH_IMAGE022
And is and
Figure 533608DEST_PATH_IMAGE023
，
Figure 390705DEST_PATH_IMAGE024
，
Figure 84992DEST_PATH_IMAGE025
(ii) a Wherein the content of the first and second substances,
Figure 736553DEST_PATH_IMAGE026
is composed of
Figure 781869DEST_PATH_IMAGE027
The ith row and the jth column of (g),
Figure 177078DEST_PATH_IMAGE028
is composed of
Figure 663555DEST_PATH_IMAGE029
The ith row and the jth column of (g),
Figure 751596DEST_PATH_IMAGE030
representing the element in row 1 and column i in Q,
Figure 18630DEST_PATH_IMAGE031
representing the background noise mean;
calculating the mean value of the background noise values
Figure 217530DEST_PATH_IMAGE032
，
Figure 620829DEST_PATH_IMAGE033
Where T represents the transpose of the matrix;
the matrix Q is calculated and,
Figure 66723DEST_PATH_IMAGE034
calculating the interference signal
Figure 821052DEST_PATH_IMAGE035
And background noise
Figure 558064DEST_PATH_IMAGE036
Find all elements in the matrix Q greater than 6 db, if there is an indexed positive integer r such that
Figure 81449DEST_PATH_IMAGE037
Then let
Figure 511294DEST_PATH_IMAGE038
Then let it
Figure 425023DEST_PATH_IMAGE039
Finally, an interference signal is obtained
Figure 965726DEST_PATH_IMAGE035
Background noise
Figure 609197DEST_PATH_IMAGE036
；
Background noise measurement
Figure 944363DEST_PATH_IMAGE040
The calculation method of (2) is as follows:
Figure 673285DEST_PATH_IMAGE041
，
wherein, the function max (A) represents the first maximum value in all elements of the matrix A;
the actual value of the background noise
Figure 440515DEST_PATH_IMAGE042
The calculation method of (2) is as follows:
when the background noise measures
Figure 938492DEST_PATH_IMAGE040
Has the unit of
Figure 444560DEST_PATH_IMAGE043
Actual value of background noise
Figure 660778DEST_PATH_IMAGE044
Has the unit of
Figure 543283DEST_PATH_IMAGE045
When the temperature of the water is higher than the set temperature,
Figure 99029DEST_PATH_IMAGE046
；
when the background noise measures
Figure 41577DEST_PATH_IMAGE040
Has the unit of
Figure 479512DEST_PATH_IMAGE047
Actual value of background noise
Figure 900129DEST_PATH_IMAGE042
Has the unit of
Figure 372699DEST_PATH_IMAGE047
When the temperature of the water is higher than the set temperature,
Figure 141940DEST_PATH_IMAGE048
；
when the background noise measures
Figure 67171DEST_PATH_IMAGE049
Has the unit of
Figure 291479DEST_PATH_IMAGE050
Actual value of background noise
Figure 618555DEST_PATH_IMAGE042
Has the unit of
Figure 902906DEST_PATH_IMAGE051
When the temperature of the water is higher than the set temperature,
Figure 253116DEST_PATH_IMAGE052
；
wherein the antenna factor AF unit is
Figure 15536DEST_PATH_IMAGE053
Gain of radio frequency channel
Figure 197118DEST_PATH_IMAGE054
Has a unit of
Figure 652370DEST_PATH_IMAGE055
Gain of antenna
Figure 552193DEST_PATH_IMAGE056
Has a unit of
Figure 827227DEST_PATH_IMAGE057
Reference bandwidth
Figure 863316DEST_PATH_IMAGE058
And resolution bandwidth
Figure 489470DEST_PATH_IMAGE059
Has the unit of
Figure 876589DEST_PATH_IMAGE060
。
2. The method of claim 1, wherein the test parameters further include a maximum allowable interference field strength and a maximum allowable interference power, and the actual values of the interference signal and the background noise are compared with the maximum allowable interference power or the maximum allowable interference field strength to obtain the detection results of the interference signal and the background noise in the test frequency band.
3. The method according to claim 2, wherein the step of comparing the actual values of the interference signal and the background noise with the maximum allowable interference power or the maximum allowable interference field strength to obtain the detection results of the interference signal and the background noise in the test frequency band specifically comprises:
comparing the actual value of the background noise with the maximum allowable interference power or the maximum allowable interference field strength;
if the actual value of the background noise is smaller than the maximum allowable interference power or the maximum allowable interference field strength and the interference signal is a zero matrix, the detection result is that the test frequency band has no interference signal and background noise which exceed the maximum allowable interference power or the maximum allowable interference field strength;
if the actual value of the background noise is smaller than the maximum allowable interference power or the maximum allowable interference field strength and the interference signal is a non-zero matrix, listing a frequency point or a frequency band formed by non-zero elements in the first row of the interference signal matrix and a corresponding amplitude value, wherein the detection result is that the interference signal exists in the test frequency band;
if the actual value of the background noise is greater than the maximum allowable interference power or the maximum allowable interference field strength and the interference signal is a zero matrix, the detection result is that the background noise in the test frequency band exceeds the maximum allowable interference power or the maximum allowable interference field strength;
if the actual value of the background noise is greater than the maximum allowable interference power or the maximum allowable interference field strength and the interference signal is a non-zero matrix, listing a frequency point or a frequency band formed by non-zero elements in the first row of the interference signal matrix and a corresponding amplitude value, and determining that the detection result is that the interference signal exists in the test frequency band and the background noise exceeds the maximum allowable interference power or the maximum allowable interference field strength.
4. The electromagnetic environment detection device comprises an input unit and a calculation unit, and is characterized in that the input unit comprises a frequency spectrum data acquisition module and a test parameter input module, and the calculation unit comprises a data fusion module and a data processing module; wherein the content of the first and second substances,
the data fusion module is used for performing fusion processing on the test spectrum data to output comprehensive spectrum data, and the data processing module is used for calculating a background noise actual value and an interference signal according to the comprehensive spectrum data and the test parameters;
the test parameter input module is used for inputting test parameters required by electromagnetic environment detection.
5. The electromagnetic environment detection apparatus of claim 4, wherein the spectral data acquisition module comprises a receiving antenna, the receiving antenna is connected to the preprocessor via a radio frequency cable, the preprocessor is connected to the spectrometer via a radio frequency cable, the spectrometer is communicatively connected to the computing unit, and the preprocessor comprises an attenuator, a low noise amplifier, and a filter.
6. The electromagnetic environment detecting device of claim 5, further comprising a test frequency band detecting module for comparing the actual values of the interference signal and the background noise with the maximum allowable interference power or the maximum allowable interference field strength to obtain the detection results of the interference signal and the background noise in the test frequency band.
7. An electromagnetic environment detection system, comprising the electromagnetic environment detection device of claim 6, wherein the electromagnetic environment detection device is further connected with an output unit, and the output unit comprises a display module, a report generation module and a storage module; wherein the content of the first and second substances,
the display module is used for displaying the detection result of the test frequency band;
the report generation module is used for generating a uniform report document according to the detection result;
and the storage module is used for storing the detection result of the test frequency band and can be called by the terminal with the access authority to trace the result.
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