CN111682907A - Satellite antenna isolation high-precision test system - Google Patents

Satellite antenna isolation high-precision test system Download PDF

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CN111682907A
CN111682907A CN202010351768.9A CN202010351768A CN111682907A CN 111682907 A CN111682907 A CN 111682907A CN 202010351768 A CN202010351768 A CN 202010351768A CN 111682907 A CN111682907 A CN 111682907A
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antenna
data
isolation
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CN111682907B (en
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张玉廷
杨小勇
王振兴
刘立平
张庆君
周怀安
舒卫平
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Beijing Institute of Spacecraft System Engineering
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/10—Monitoring; Testing of transmitters
    • H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
    • H04B17/102—Power radiated at antenna
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/345—Interference values
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay

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Abstract

The invention discloses a high-precision test system for satellite antenna isolation, which can complete the test of the characteristics of a test system link in a wider frequency band only by one time, improves the test efficiency, realizes the data on a concerned frequency band or a frequency point in the test process of the wider frequency band by data interpolation processing in the test process of the test link, and ensures the test precision; the suppression of environmental interference including environmental electromagnetic reflection and electromagnetic scattering signals is realized through filtering processing on the spatial distance, and the testing accuracy is improved; the antenna isolation degree evaluation method has the advantages that the relation between the angle, the frequency and the isolation degree is uniformly reflected for the antenna with a plurality of working states, the relation between the antenna isolation degree and the frequency of the antenna in different states can be fully reflected, the integrity of the antenna isolation degree data is improved, and the accuracy of the satellite system radio frequency compatibility evaluation is guaranteed.

Description

Satellite antenna isolation high-precision test system
Technical Field
The invention belongs to the technical field of satellite radio frequency electromagnetic compatibility, and particularly relates to a satellite antenna isolation high-precision testing system.
Background
Antenna isolation is a key content of satellite radio frequency electromagnetic compatibility, and relates to satellite antenna layout and system level electromagnetic compatibility. For satellites with complex electromagnetic environments, a radiation model star or an electrical star is generally required to be designed for special antenna isolation tests.
Regarding the antenna isolation test, different methods are proposed in patents such as CN1324911C "device and method for testing antenna isolation of wireless co-frequency repeater", CN105306153B "device and method for measuring antenna isolation", CN106559145A "system and method for testing isolation between antennas", and CN106027177A "method for testing isolation between antennas at multiple elevation angles". However, in the process of testing the isolation degree of the satellite antenna, the methods mainly have the following three problems:
one is that the frequency range of satellite application is very wide, and multiple frequency bands such as L, S, C and Ka are often applied to one satellite at the same time. When the antenna isolation is tested in such a wide frequency band, the calibration of the test system link may greatly affect the accuracy and efficiency of the test result. If the test parameters are directly applied to the test result after the link is tested in the wider frequency band, the test precision is affected due to lower resolution; if the system link test is performed in each test frequency band, the test efficiency is greatly reduced. Therefore, a system link testing method which simultaneously considers the testing precision and the testing efficiency is needed.
And secondly, the satellite antenna isolation degree test is usually carried out in a laboratory, the laboratory cannot be completely consistent with an ideal open field, in the test process, the electromagnetic wave reflection and scattering caused by the test environment can seriously influence the test result, and the test result is seriously oscillated, so that the test result is difficult to judge. Moreover, errors approaching 20dB have been found in practical tests, which adversely affect the theory. Therefore, in the process of testing the isolation of the antenna, the influence of the environment must be processed, and the accuracy of the test is improved.
Thirdly, when the tested antenna has a multi-angle working state, the test result of a single angle cannot reflect the change condition of the antenna isolation, and the antenna isolation change condition which simultaneously reflects the relation between different angles and frequencies of the antenna needs to be provided.
The problem with these three aspects is that the above patents do not consider, or only consider narrow band testing without concern.
Disclosure of Invention
In view of this, the present invention provides a high-precision test system for satellite antenna isolation, which can ensure the test precision and improve the test efficiency.
A high-precision test system for satellite antenna isolation comprises a control module, a data processing module and a test result output module; the control module is used for controlling the test equipment and reading initial test data; the data processing module is used for analyzing and processing initial test data; the test result output module is used for outputting the processed test data, and specifically comprises the following steps:
the control module is specifically configured to:
1) controlling a vector network analyzer to calibrate;
2) establishing a test system link of the satellite antenna, and controlling a vector network analyzer to carry out S21 parameter test on the test system link;
3) reading an S21 parameter of a test system link and exporting the S21 parameter to a central computer;
4) after the test state of the satellite antenna is determined, setting measurement parameters of a vector network analyzer according to the state and the requirement control of the antenna to be tested;
5) controlling a network analyzer to measure an antenna isolation S21 parameter of an antenna in a concerned frequency band;
6) the antenna isolation test result S21 is read and exported to the central computer;
7) if the current antenna is in only one state, the test of the isolation of the antenna is finished; if the antenna has a plurality of states, adjusting the states and repeating the process;
the data processing module is specifically configured to:
1) after the data processing module obtains data from the central computer, interpolation processing is carried out on the obtained isolation S21 parameter to obtain link characteristic data on the concerned frequency point;
2) eliminating the link characteristic data obtained in the last step from the antenna isolation measurement result to obtain a processed result Sf21；
3) To Sf21, carrying out Fourier inversion to obtain a time domain characteristic parameter St21；
4) Obtaining a filtering time window by taking the distance between the satellite and the edge of the test field as the light speed; taking the peak value on the time domain characteristic as a filtering center point, and taking the filtering time window as a filtering width for filtering to obtain a parameter S't21；
5) And parameter S't21 times a windowing function;
6) to S't21, performing Fourier transform, namely obtaining an antenna isolation test result S of the satellite antenna in the current statep21；
7) If the current antenna has only one state, finishing processing the antenna isolation data; if the antenna has a plurality of states, adjusting the states and repeating the process;
the test result output module is specifically configured to:
1) when the test antenna has only one state, outputting an antenna isolation test result in the form of a two-dimensional curve graph;
2) when the test antenna has a plurality of states, outputting an antenna isolation test result in the form of a pseudo color image;
3) and when the test data is needed, outputting the antenna isolation test result in a table form.
Preferably, when testing the S21 parameter of the test system link, the test covers all frequency bands of the satellite antenna isolation to be tested at one time, the frequency fO is used as the reference frequency input data, and the amplitude-phase parameter corresponding to the S21 parameter is used as the output data, so as to obtain the reference link data;
when testing the isolation between a certain transmitting antenna and a receiving antenna, determining a frequency fin to be tested;
and taking the frequency fin as an interpolation input, and in the reference link data, calculating by adopting third-order spline interpolation to obtain S21 amplitude phase parameters of the fin of the frequency fin to be tested.
Preferably, the control module realizes the specific functions through the following function transfer process:
1) entering a control module interface after logging in the system;
2) calling a function Cal _ VNA to calibrate the vector network analyzer;
3) calling a function Con _ VNA, and controlling a vector network analyzer to set test parameters, frequency bands, output power, medium frequency bandwidth and test point number;
4) calling a function Mea _ VNA to control a vector network analyzer to carry out S21 parameter test on a test system link;
5) and judging whether the test process is to test a link or a test antenna. If the link is tested, calling a function Dat _ Sys, and storing the parameter test result of the test system link S21 in a data table form into the central computer; if the antenna is tested, calling a function Dat _ Ant, and storing an S21 parameter test result of the antenna to be tested in a data table form into the central computer;
6) judging whether to repeat the current process or enter the next process through the process in each process;
7) after the whole process is finished, judging whether to repeat the process of the current module or quit the current module;
the link test result storage format is as follows:
frequency of S21 real part of parameter S21 imaginary part of parameter
…… …… ……
The antenna isolation test result storage format is as follows:
Figure BDA0002472170700000041
Figure BDA0002472170700000051
preferably, the data processing module realizes its specific functions through the following function transfer process:
1) entering a data processing module interface after logging in the system;
2) calling a Re _ Sys function, and reading the parameters of the test system link S21 stored on the central computer;
3) calling a Re _ Ant function, and reading the S21 parameter of the isolation of the antenna to be tested, which is stored on the central computer;
4) calling a Post _ Ant function, and eliminating the influence of the test link on the antenna isolation measurement result in a corresponding frequency band;
5) calling an Ifft _ Ant function and carrying out Fourier inverse transformation;
6) calling an SF _ Ant function to carry out spatial filtering processing on the multipath signals;
7) calling Fft _ Ant function, and performing Fourier transform to obtain an antenna isolation test result of the current antenna in the current state;
8) calling a Save _ Ant function, storing the processed result into a central computer in a data table form, and transmitting the data to a test result output module;
9) judging whether to repeat the current process or enter the next process through the process in each process;
10) after the whole process is finished, judging whether to repeat the process of the current module or quit the current module;
the link test result storage format is as follows:
Figure BDA0002472170700000052
preferably, the test result output module realizes the specific functions thereof through the following function transfer process:
1) entering a data processing module interface after logging in the system;
2) judging the state of the test antenna;
3) when the test antenna has only one state, calling a Lin _ An function, and outputting An antenna isolation test result in a form of a two-dimensional curve graph;
4) when the test antenna has a plurality of states, calling a Fig _ An function, and outputting An antenna isolation test result in a form of a pseudo color image;
5) judging whether to repeat the current process or enter the next process through the process in each process;
6) and after the whole process is finished, judging to repeat the process of the current module or quitting the current module.
The invention has the following beneficial effects:
according to the satellite antenna isolation high-precision test system, the characteristics of the link of the test system in a wider frequency band can be tested only once, so that the test efficiency is improved, data on a frequency band or a frequency point is focused in the wider frequency band test process through data interpolation processing in the test process of the link, and the test precision is ensured; the suppression of environmental interference including environmental electromagnetic reflection and electromagnetic scattering signals is realized through filtering processing on the spatial distance, and the testing accuracy is improved; the antenna isolation degree evaluation method has the advantages that the relation between the angle, the frequency and the isolation degree is uniformly reflected for the antenna with a plurality of working states, the relation between the antenna isolation degree and the frequency of the antenna in different states can be fully reflected, the integrity of the antenna isolation degree data is improved, and the accuracy of the satellite system radio frequency compatibility evaluation is guaranteed.
Drawings
FIG. 1 is a system architecture diagram of the present invention.
FIG. 2 is a diagram of the function transfer process of the control module of the present invention;
FIG. 3 is a diagram of the function transfer process of the data processing module of the present invention;
FIG. 4 is a diagram of the function transfer process of the test result output module of the present invention;
fig. 5 is an example of a comparison between a test link using interpolation processing and a conventional test method.
Fig. 6 is an example of comparison with a conventional test method using a spatial filtering process.
Fig. 7 is an example of the results of an L-band antenna isolation test for the presence of a single state.
Fig. 8 is an example of the results of the S-band antenna isolation test for the presence of a single state.
Fig. 9 is an example of the results of the isolation test for a Ka band antenna for which there are multiple states.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
As shown in fig. 1, in order to implement the satellite antenna isolation high-precision testing system of the present invention, the system is carried on a central computer for application. The system mainly comprises three modules: the device comprises a control module, a data processing module and a test result output module. The control module is mainly used for controlling the test equipment and reading the test result data. The data processing module is mainly used for analyzing and processing initial test data. The test result output module is mainly used for outputting the processed test data in the form of a graph and a table.
The user performs the analysis by entering corresponding instructions on the central computer.
When the user starts the control module, the control module is mainly used for controlling the test equipment and reading the test data and is stored on the central computer.
The method comprises the following specific steps:
1) and controlling the vector network analyzer to calibrate.
2) And establishing a test system link, such as a cable used for testing, and controlling the vector network analyzer to perform S21 parameter testing on the test system link.
3) The S21 parameter of the read test system link is exported to the central computer.
4) And after the test state of the satellite antenna is determined, setting measurement parameters of a vector network analyzer according to the state and the requirement control of the antenna to be tested.
5) And controlling the network analyzer to measure the antenna isolation S21 parameter of the antenna in the concerned frequency band.
6) The read antenna isolation test result S21 is exported to the central computer.
7) If the current antenna is in only one state, the test of the isolation of the antenna is finished; if the antenna has multiple states, the adjustment state repeats the above steps.
When the user starts the data processing module, the data processing module is mainly used for processing the test data on the central computer and storing the test data on the central computer.
The method comprises the following specific steps:
1) when the link test of the test system is carried out, the frequency band is wide, the frequency resolution is poor, and interpolation processing is carried out on the test result to obtain the link characteristic on the concerned frequency point.
When the test system link S21 parameter is tested, all frequency bands covering the isolation of the satellite antenna to be tested are tested at one time, the frequency fO is used as reference frequency input data, and amplitude-phase parameters corresponding to S21 parameters are used as output data to obtain reference link data;
when testing the isolation between a certain transmitting antenna and a receiving antenna, determining a frequency fin to be tested;
using the frequency fin as interpolation input, in the reference link dataAnd calculating by adopting a third-order spline interpolation to obtain the amplitude-phase parameter of the frequency fin to be tested. 2) Eliminating the influence of the test link on the antenna isolation measurement result to obtain a processed result Sf21。
3) Performing Fourier inverse transformation to obtain time domain characteristic parameter St21。
4) Taking the peak value on the time domain characteristic as a filtering central point, taking the distance smaller than the satellite distance testing field edge as a filtering width, and filtering the spatial distance to obtain a parameter S't21。
5) Parameter S't21 times a windowing function; the windowing function may be any windowing function, with a kessel windowing function being preferred.
6) Fourier transform is carried out, namely the result S of the antenna isolation test of the current antenna in the current state is obtainedp21。
7) If the current antenna has only one state, finishing processing the antenna isolation data; if the antenna has multiple states, the adjustment state repeats the above steps.
When the user starts the test result output module, the test result output module is mainly used for outputting the test result in the form of a graph and a table.
The method comprises the following specific steps:
1) and when the test antenna has only one state, outputting an antenna isolation test result in the form of a two-dimensional graph.
2) When the test antenna has a plurality of states, the test result of the isolation degree of the antenna is output in the form of a pseudo color image.
3) And when the test data is needed, outputting the antenna isolation test result in a table form.
The above steps are repeated when testing other antenna pairs.
Example (b):
as shown in fig. 1, the system is on a central computer, and carries three modules: the device comprises a control module, a data processing module and a test result output module. The control module is mainly used for controlling the test equipment and reading the test result data. The data processing module is mainly used for analyzing and processing initial test data. The test result output module is mainly used for outputting the processed test data in the form of a graph and a table.
And starting AITS.exe, and logging in the system.
As shown in fig. 2, the control module is mainly used for controlling the testing device and reading the testing data, and is stored on the central computer.
The concrete implementation steps are as follows:
1) and entering a control module interface after logging in the system.
2) And the vector network analyzer is connected with a corresponding calibration piece, and a function Cal _ VNA is called to calibrate the vector network analyzer.
3) And establishing a test system link.
4) And calling a function Con _ VNA to control the vector network analyzer to set test parameters, frequency bands, output power, medium frequency bandwidth and test point number. In the test process, the S21 parameter is tested, and the frequency band used by the tested satellite is 1-30 GHz. The transmission power is set to 0dBm, the medium frequency bandwidth is set to 100Hz, and the number of test points is set to 3201.
5) And calling a function Mea _ VNA to control the vector network analyzer to perform S21 parameter test on the test system link.
6) Calling a function Dat _ Sys, and storing the parameter test result of the test system link S21 in a data table form into the central computer, wherein the data format is as follows:
frequency of S21 real part of parameter S21 imaginary part of parameter
…… …… ……
7) And after the test state of the satellite antenna is determined, calling a function Con _ VNA according to the state and the requirement of the antenna to be tested, and controlling a vector network analyzer to set test parameters, a frequency band, output power, a medium frequency bandwidth and the number of test points.
8) And calling a function Mea _ VNA to control the vector network analyzer to perform S21 parameter test on the antenna to be tested.
9) Calling a function Dat _ Ant, and storing the S21 parameter test result of the antenna to be tested into the central computer in a data table form, wherein the data format is as follows:
Figure BDA0002472170700000101
10) if the current antenna is in only one state, the test of the isolation of the antenna is finished; if the antenna has multiple states, the adjustment state repeats the above steps. The data storage format is as follows:
Figure BDA0002472170700000102
as shown in fig. 3, the data processing module is mainly used for processing the test data on the central computer and storing the test data on the central computer.
The concrete implementation steps are as follows:
1) and entering a data processing module interface after logging in the system.
2) The Re _ Sys function is called to read the test system link S21 parameters stored on the central computer.
3) When the link test of the test system is carried out, the frequency band is wide, the frequency resolution is poor, and interpolation processing is carried out on the test result to obtain the link characteristic on the concerned frequency point. In this embodiment, third-order spline interpolation processing is performed on the test result to obtain link characteristics concerning the L frequency band, the S frequency band, and the Ka frequency band. The comparative results are shown in FIG. 5.
4) The Re _ Ant function is called to read the measured antenna isolation S21 parameter stored on the central computer.
5) Calling a Post _ Ant function, eliminating the influence of the test link on the antenna isolation measurement result in the corresponding frequency band, and obtaining a processed result Sf21。
6) Calling an Ifft _ Ant function, and performing inverse Fourier transform to obtain a time domain characteristic parameter St21。
7) Calling an SF _ Ant function, taking a peak value on the time domain characteristic as a filtering central point, taking a distance smaller than the satellite distance from the testing field edge as a filtering width, and filtering the spatial distance to obtain a parameter S't21. In this embodiment, the distance smaller than 10m is used as the filter width.
8) Calling Fft _ Ant function, and performing Fourier transform, namely obtaining the antenna isolation test result S of the current antenna in the current statep21. The comparative results are shown in FIG. 6.
9) And calling a Save _ Ant function, and storing the processed result into the central computer in a data table form. The data storage format is as follows:
Figure BDA0002472170700000111
in this embodiment, the test of the isolation of the antenna is finished because the L antenna and the S antenna are in only one state on the satellite. The above steps are repeated for the Ka antenna. Because the Ka antenna comprises a plurality of scanning angles, the antenna isolation degree test of a plurality of angles is carried out to obtain a comprehensive test result.
As shown in fig. 4, the test result output module is mainly used for outputting test results in the form of a graph or a table.
The concrete implementation steps are as follows:
1) and entering a data processing module interface after logging in the system.
2) The test results are stored in the central computer in the form of a data table. The data storage format is as follows:
Figure BDA0002472170700000121
3) the user can open the data file with the Excel program.
4) And when the test antenna has only one state, calling a Lin _ An function, and outputting An antenna isolation test result in a two-dimensional graph form. As shown in fig. 7 and 8.
5) When the test antenna has a plurality of states, calling the Fig _ An function, and outputting An antenna isolation test result in the form of a pseudo color image. As shown in fig. 9.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. A high-precision test system for satellite antenna isolation is characterized by comprising a control module, a data processing module and a test result output module; the control module is used for controlling the test equipment and reading initial test data; the data processing module is used for analyzing and processing initial test data; the test result output module is used for outputting the processed test data, and specifically comprises the following steps:
the control module is specifically configured to:
1) controlling a vector network analyzer to calibrate;
2) establishing a test system link of the satellite antenna, and controlling a vector network analyzer to carry out S21 parameter test on the test system link;
3) reading an S21 parameter of a test system link and exporting the S21 parameter to a central computer;
4) after the test state of the satellite antenna is determined, setting measurement parameters of a vector network analyzer according to the state and the requirement control of the antenna to be tested;
5) controlling a network analyzer to measure an antenna isolation S21 parameter of an antenna in a concerned frequency band;
6) the antenna isolation test result S21 is read and exported to the central computer;
7) if the current antenna is in only one state, the test of the isolation of the antenna is finished; if the antenna has a plurality of states, adjusting the states and repeating the process;
the data processing module is specifically configured to:
1) after the data processing module obtains data from the central computer, interpolation processing is carried out on the obtained isolation S21 parameter to obtain link characteristic data on the concerned frequency point;
2) eliminating the link characteristic data obtained in the last step from the antenna isolation measurement result to obtain a processed result Sf21；
3) To Sf21, carrying out Fourier inversion to obtain a time domain characteristic parameter St21；
4) Obtaining a filtering time window by taking the distance between the satellite and the edge of the test field as the light speed; taking the peak value on the time domain characteristic as a filtering center point, and taking the filtering time window as a filtering width for filtering to obtain a parameter S't21；
5) And parameter S't21 times a windowing function;
6) to S't21, performing Fourier transform, namely obtaining an antenna isolation test result S of the satellite antenna in the current statep21；
7) If the current antenna has only one state, finishing processing the antenna isolation data; if the antenna has a plurality of states, adjusting the states and repeating the process;
the test result output module is specifically configured to:
1) when the test antenna has only one state, outputting an antenna isolation test result in the form of a two-dimensional curve graph;
2) when the test antenna has a plurality of states, outputting an antenna isolation test result in the form of a pseudo color image;
3) and when the test data is needed, outputting the antenna isolation test result in a table form.
2. The satellite antenna isolation high-precision test system of claim 1, wherein when testing the S21 parameters of the test system link, one test covers all frequency bands of the isolation of the satellite antenna to be tested, and the reference link data is obtained by using the frequency fO as the reference frequency input data and the amplitude-phase parameter corresponding to the S21 parameter as the output data;
when testing the isolation between a certain transmitting antenna and a receiving antenna, determining a frequency fin to be tested;
and taking the frequency fin as an interpolation input, and in the reference link data, calculating by adopting third-order spline interpolation to obtain S21 amplitude phase parameters of the fin of the frequency fin to be tested.
3. The satellite antenna isolation high-precision test system according to claim 1, wherein the control module realizes its specific functions through the following function transfer process:
1) entering a control module interface after logging in the system;
2) calling a function Cal _ VNA to calibrate the vector network analyzer;
3) calling a function Con _ VNA, and controlling a vector network analyzer to set test parameters, frequency bands, output power, medium frequency bandwidth and test point number;
4) calling a function Mea _ VNA to control a vector network analyzer to carry out S21 parameter test on a test system link;
5) and judging whether the test process is to test a link or a test antenna. If the link is tested, calling a function Dat _ Sys, and storing the parameter test result of the test system link S21 in a data table form into the central computer; if the antenna is tested, calling a function Dat _ Ant, and storing an S21 parameter test result of the antenna to be tested in a data table form into the central computer;
6) judging whether to repeat the current process or enter the next process through the process in each process;
7) after the whole process is finished, judging whether to repeat the process of the current module or quit the current module;
the link test result storage format is as follows:
frequency of S21 real part of parameter S21 imaginary part of parameter …… …… ……
The antenna isolation test result storage format is as follows:
Figure FDA0002472170690000031
4. the satellite antenna isolation high-precision test system according to claim 1, wherein the data processing module realizes its specific functions through the following function transfer process:
1) entering a data processing module interface after logging in the system;
2) calling a Re _ Sys function, and reading the parameters of the test system link S21 stored on the central computer;
3) calling a Re _ Ant function, and reading the S21 parameter of the isolation of the antenna to be tested, which is stored on the central computer;
4) calling a Post _ Ant function, and eliminating the influence of the test link on the antenna isolation measurement result in a corresponding frequency band;
5) calling an Ifft _ Ant function and carrying out Fourier inverse transformation;
6) calling an SF _ Ant function to carry out spatial filtering processing on the multipath signals;
7) calling Fft _ Ant function, and performing Fourier transform to obtain an antenna isolation test result of the current antenna in the current state;
8) calling a Save _ Ant function, storing the processed result into a central computer in a data table form, and transmitting the data to a test result output module;
9) judging whether to repeat the current process or enter the next process through the process in each process;
10) after the whole process is finished, judging whether to repeat the process of the current module or quit the current module;
the link test result storage format is as follows:
Figure FDA0002472170690000041
5. the satellite antenna isolation high-precision test system according to claim 1, wherein the test result output module realizes specific functions thereof through a function transfer process as follows:
1) entering a data processing module interface after logging in the system;
2) judging the state of the test antenna;
3) when the test antenna has only one state, calling a Lin _ An function, and outputting An antenna isolation test result in a form of a two-dimensional curve graph;
4) when the test antenna has a plurality of states, calling a Fig _ An function, and outputting An antenna isolation test result in a form of a pseudo color image;
5) judging whether to repeat the current process or enter the next process through the process in each process;
6) and after the whole process is finished, judging to repeat the process of the current module or quitting the current module.
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