CN114264888B - SAR load satellite pulse electromagnetic leakage testing method - Google Patents
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Abstract
The invention relates to a pulse electromagnetic leakage testing method of an SAR loading satellite, in particular to a testing method of pulse electromagnetic leakage in a cabin, and belongs to the technical field of SAR loading satellite electromagnetic compatibility. The method and the device realize the correction of the influence of specific characteristic parameters of the SAR load signal on the test result, on one hand, the test accuracy is improved, and on the other hand, specific correction factors can be calculated aiming at different parameters, so that the universality of the method is ensured. The method realizes the correction of the influence of the SAR load working mode on the test result, fully considers the influence of the load scanning mode, so as to fully evaluate the influence of different load scanning modes on electromagnetic leakage and avoid under-design. The invention provides a field intensity test probe characteristic correction method, which improves the accuracy of test results on one hand, and on the other hand, realizes the high-sensitivity requirement test of pulse electromagnetic leakage by adopting general equipment, and overcomes the problem of insufficient support of general equipment.
Description
Technical Field
The invention relates to a pulse electromagnetic leakage testing method of an SAR loading satellite, in particular to a testing method of pulse electromagnetic leakage in a cabin, and belongs to the technical field of SAR loading satellite electromagnetic compatibility.
Background
Electromagnetic leakage of a radio frequency system is an electromagnetic compatibility index which is strictly controlled by a microwave loading satellite or an electromagnetic environment complex satellite, and tests are carried out in both a primary sample development stage and a positive sample development stage. Because the radio frequency link is subject to multiple transitions, including transitions between waveguides, cables, and waveguide-to-cable. If a good connection or shielding is not achieved at the transition, electromagnetic signal leakage may result. On one hand, signal power loss can be caused, and on the other hand, radiation electromagnetic interference can be generated, so that normal operation of electronic equipment in the cabin is influenced. Therefore, electromagnetic leakage of a radio frequency system link needs to be detected, and electromagnetic leakage points exceeding the index requirements are processed to ensure that the satellite has a good electromagnetic environment.
The electromagnetic leakage test is generally performed mainly on continuous wave signals. However, with the rapid development and application and technical progress of the pulsed signal system satellite represented by the SAR load, the object to be faced by the electromagnetic leakage test of the satellite radio frequency system gradually develops from continuous wave signal to pulsed signal. Particularly for high-orbit SAR load satellites, the radio frequency system has high power and high sensitivity, and the leakage of radio frequency electromagnetic interference is particularly a control key point. However, the conventional continuous wave signal electromagnetic interference leakage test method is not suitable for the pulse signal electromagnetic interference leakage test method, and cannot effectively test the electromagnetic leakage intensity of the pulse signal. Meanwhile, unlike continuous wave signals, pulse signals have more complex characteristic performances, different satellites have different duty ratios, pulse repetition frequencies, load scanning modes and the like, and all factors can influence electromagnetic leakage. However, the conventional continuous wave signal electromagnetic leakage testing method does not consider these factors, and can affect the accuracy of the test.
In addition, the current field intensity testing instrument mainly aims at testing continuous wave signals, and is relatively lacking in testing instruments for transient interference such as pulse signals. The sensitivity of the electromagnetic interference field intensity measuring instrument caused by partial pulse signals is low, and the electromagnetic interference field intensity measuring instrument is only suitable for high field intensity testing. The satellite radio frequency system has higher sensitivity and higher reliability requirement, so that the magnitude of electromagnetic leakage control is lower, the conventional pulse field intensity measuring equipment is not suitable for testing the electromagnetic leakage of the satellite, and the sensitivity cannot meet the requirement.
Disclosure of Invention
The technical solution of the invention is as follows: the pulse electromagnetic leakage testing method for the SAR load satellite is provided for overcoming the defects of the prior art. The method uses traditional electric field intensity measuring equipment to obtain higher sensitivity, and simultaneously realizes effective measurement of pulse signals through field intensity probe parameter correction technology. Meanwhile, the influence of the signal form and the working mode of the SAR load on the test result is fully considered, and the test result is corrected through specific characteristic parameters and the working mode of the SAR load signal.
The technical solution of the invention is as follows:
a pulse electromagnetic leakage test method of SAR load satellite comprises the following steps:
the method comprises the steps of firstly, determining a test link and a test position;
the test link is a radio frequency transmitting link with a connecting point;
the test position is at a distance of 5-20cm from the connection point;
secondly, determining the test frequency and the bandwidth of the test radio frequency transmission link, selecting a test field intensity meter and a field intensity probe according to the determined test frequency and the determined bandwidth, and when the test field intensity meter and the field intensity probe are selected, covering the test frequency and the bandwidth of the test radio frequency transmission link by the frequency range of the test field intensity meter and the frequency range of the field intensity probe, wherein the test frequency and the bandwidth of the test radio frequency transmission link are required to meet the following formula:
wherein F is + To test the highest frequency which can be tested by the field intensity meter, F - For testing the lowest frequency f which can be tested by the field intensity meter c B is the bandwidth of the tested radio frequency transmission link;
thirdly, determining SAR load characteristics;
the SAR load characteristics comprise a duty cycle Dc; pulse width Pw; an antenna beam width α; test positionDistance r from the antenna port face; load integration time t int The method comprises the steps of carrying out a first treatment on the surface of the Determining whether the load antenna scans, if so, determining the scanning time t r If antenna scanning is not needed, the scanning time does not need to be determined;
fourth, setting the testing field intensity instrument as a maximum holding mode, and testing the electromagnetic leakage field intensity of the testing position to obtain a testing result E 1 ；
Fifth, according to the load characteristics, the test result E obtained in the fourth step is tested 1 Correcting;
and sixthly, correcting the test result obtained in the fifth step according to the characteristics of the field intensity probe to obtain the electromagnetic leakage field intensity of the tested position.
Preferably, in the first step, the connection point includes a waveguide connection point, a radio frequency cable connection point, and a connection point between the waveguide and the radio frequency cable.
Preferably, in the fifth step, the test result E is based on the load characteristics 1 The correction method comprises the following steps:
(1) Test result E according to load antenna scanning characteristics 1 Correction is made, if the load is not in scan mode, then no correction is required for E 1 Correction is performed, and if the load is in the scanning mode, E is performed according to the following equation 1 And (3) correction:
wherein E is 2 The field intensity is corrected according to the load scanning characteristics; ec is a delay correction factor; t is t s Is the worst case active time;
(2) According to the duty ratio, test result E 1 Correction is performed, if the duty ratio is smaller than 0.001, the field intensity after the correction of the scanning characteristic of the load antenna is not required to be corrected, otherwise E is performed according to the following formula 2 Correcting;
wherein: e (E) p The field strength after correction according to the duty cycle.
Preferably, in the sixth step, the method for correcting the test result obtained in the fifth step according to the characteristics of the field intensity probe includes:
1) If the field intensity probe is thermocouple type, the test result does not need to be corrected again;
2) If the field strength probe is diode-type, E is performed as follows p And (3) correction:
wherein E is the field intensity corrected according to the field intensity probe characteristics; dp is the field strength probe correction factor.
Preferably, the field strength probe correction factor dp is a set of data relating to the measured electromagnetic field strength and the repetition frequency of the load pulse, obtained by metrology calibration.
Preferably, the load pulse repetition frequency PRF is:
advantageous effects
1) The method and the device realize the correction of the influence of specific characteristic parameters of the SAR load signal on the test result, on one hand, the test accuracy is improved, and on the other hand, specific correction factors can be calculated aiming at different parameters, so that the universality of the method is ensured.
2) The method realizes the correction of the influence of the SAR load working mode on the test result, fully considers the influence of the load scanning mode, so as to fully evaluate the influence of different load scanning modes on electromagnetic leakage and avoid under-design.
3) The invention provides a field intensity test probe characteristic correction method, which improves the accuracy of test results on one hand, and on the other hand, realizes the high-sensitivity requirement test of pulse electromagnetic leakage by adopting general equipment, and overcomes the problem of insufficient support of general equipment.
Drawings
FIG. 1 is a flow chart of a test method of the present invention.
Fig. 2 is a field intensity probe correction factor in an embodiment.
Detailed Description
The application of the invention will be further described in detail with reference to the accompanying drawings by using a method for testing electromagnetic leakage of a certain SAR load satellite in a cabin.
A pulsed electromagnetic leak test method for SAR-loaded satellites, comprising the steps of:
step one, determining a test link and a test position;
1) The test link comprises all radio frequency transmission links of SAR load;
2) On each radio frequency transmission link, the test points comprise all connection points on the radio frequency transmission link, and cover the connection points of the waveguide, the radio frequency cable and the connection points between the waveguide and the radio frequency cable;
3) The test position is at a distance of 5-20cm from the connection point;
step two, determining a test frequency and a test instrument;
1) Determining a test frequency and a bandwidth of a test radio frequency transmission link;
2) Selecting a test field intensity instrument and a field intensity probe according to the frequency and the bandwidth of the tested link, wherein the frequency ranges of the field intensity instrument and the field intensity probe are required to cover the frequency and the bandwidth of the tested radio frequency transmission link, and the following formula is satisfied:
wherein: f (F) - And F + The lowest frequency and the highest frequency which can be tested by the testing instrument are respectively; f (f) c Is the center frequency of the tested link; b is the bandwidth of the tested link.
And step three, determining SAR load characteristics.
The load characteristics include: a duty cycle Dc; pulse width Pw; an antenna beam width α; the test position is a distance r from the antenna port surface; load integration time t int The method comprises the steps of carrying out a first treatment on the surface of the Determining whether the load antenna scans, if so, determining the scanning time t r If antenna scanning is not needed, the scanning time does not need to be determined;
step four, setting a test field intensity instrument as a maximum holding mode, and testing the electromagnetic leakage field intensity of the measuring position to obtain a test result E 1 。
And fifthly, correcting the test result according to the load characteristic.
1) And correcting according to the scanning characteristics of the load antenna. If the load is not in scan mode, then no data is needed for E 1 And (5) performing correction. If the load is in scan mode, E is performed according to 1 And (5) correcting.
Wherein: e (E) 2 The field intensity is corrected according to the load scanning characteristics; ec is a delay correction factor; t is t s For a worst case active time.
2) And correcting according to the duty ratio. If the duty ratio is less than 0.001, there is no need to correct the field intensity after correction of the load scanning characteristics. Otherwise, E is performed according to the following formula 2 And (5) correcting.
Wherein: e (E) p The field strength after correction according to the duty cycle.
And step six, correcting the test result according to the characteristics of the field intensity probe.
1) If the field intensity probe is thermocouple type, the test result does not need to be corrected again;
2) If the field strength probe is diode-type, the load pulse repetition frequency PRF needs to be calculated:
determining a field strength probe correction factor according to the field strength and the pulse repetition frequency, wherein the field strength probe correction factor is a set of data related to the measured electromagnetic field strength and the pulse repetition frequency and can be obtained through metering calibration; the electromagnetic leakage at the test site results in:
wherein: e is the field intensity corrected according to the field intensity probe characteristics; dp is the field strength probe correction factor.
Step seven, testing all electromagnetic leakage points of a certain link one by one according to the steps;
and step eight, repeating the process for each radio frequency transmission link of the SAR load, and traversing all the radio frequency transmission links of the SAR load.
Examples
The test flow is shown in fig. 1.
Step one, determining a test link and a test position.
1) The transmission link of SAR load has 30 paths, and the electromagnetic leakage of the 30 paths needs to be tested;
2) On each link there are 10 attachment points, which 10 attachment points need to be tested on each link;
3) The test site is at a distance of 10cm from the connection point.
And step two, determining the test frequency and a test instrument.
1) The frequency and bandwidth of the test link are 1200+/-50 MHz;
2) And selecting a test field intensity meter and a field intensity probe according to the frequency and the bandwidth of the tested link. The frequency ranges of the field intensity meter and the probe are as follows: 100 MHz-40 GHz, which covers the frequency and bandwidth of the measured link and satisfies the following formula:
wherein: f (F) - And F + The lowest frequency and the highest frequency which can be tested by the testing instrument are respectively; f (f) c Is the center frequency of the tested link; b is the bandwidth of the tested link.
And thirdly, determining SAR load characteristics.
The load characteristics include: duty cycle dc=10%; pulse width pw=500 μs; antenna beam width α=10°; the test position is at a distance r=0.5m from the antenna port face; load integration time t int =200 ms; load antenna scanning, and determining scanning time t r ＝500ms。
Step four, setting a test field intensity instrument as a maximum holding mode, and testing the electromagnetic leakage field intensity of the measuring position to obtain a test result E 1 ＝7.9V/m。
And fifthly, correcting the test result according to the load characteristic.
1) And correcting according to the load scanning characteristics. Since the load is in scan mode, E is performed according to the following equation 1 And (5) correcting.
Wherein: e (E) 2 The field intensity is corrected according to the load scanning characteristics; ec is a delay correction factor; t is t s For a worst case active time.
2) And correcting according to the duty ratio. Since the duty ratio is larger than 0.001, there is no need to correct the field intensity after correction of the load scanning characteristic.
E p ＝E 2 ＝30.2V/m
Wherein: e (E) p The field strength after correction according to the duty cycle.
And step six, correcting the test result according to the characteristics of the field intensity probe.
1) If the field intensity probe is thermocouple type, the test result does not need to be corrected again;
2) If the field strength probe is diode-type, a correction is required.
Since the field intensity probe adopted in the embodiment is of a diode type, correction of the field intensity probe coefficient is required. Calculating a load pulse repetition frequency PRF:
as shown in fig. 2, a field strength probe correction factor curve with PRF of 200Hz is selected, and then a field strength probe correction factor dp=3.45 dB is obtained corresponding to a field strength with an abscissa of 30.2V/m.
The electromagnetic leakage at the test site results in:
wherein: e is the field intensity corrected according to the field intensity probe characteristics; dp is the field strength probe correction factor.
The test result of the real-time spectrum analyzer is 42.2V/m, the results are basically consistent, the error is 0.5dB, and the requirements of + -3 dB amplitude test tolerance of a test system in an electromagnetic compatibility test standard are met. The correctness of the test results of the method is proved.
Step seven, testing all electromagnetic leakage points of the link one by one according to the steps;
and step eight, repeating the process for each radio frequency transmission link of the SAR load, and traversing all the radio frequency transmission links of the SAR load.
Claims (4)
1. A pulse electromagnetic leakage test method of SAR load satellite is characterized by comprising the following steps:
the method comprises the steps of firstly, determining a test link and a test position;
the test link is a radio frequency transmitting link with a connecting point;
the test position is at a distance of 5-20cm from the connection point;
secondly, determining the test frequency and the bandwidth of the test radio frequency transmission link, selecting a test field intensity meter and a field intensity probe according to the determined test frequency and the determined bandwidth, and when the test field intensity meter and the field intensity probe are selected, covering the test frequency and the bandwidth of the test radio frequency transmission link by the frequency range of the test field intensity meter and the frequency range of the field intensity probe, wherein the test frequency and the bandwidth of the test radio frequency transmission link are required to meet the following formula:
wherein F is + To test the highest frequency which can be tested by the field intensity meter, F - For testing the lowest frequency f which can be tested by the field intensity meter c B is the bandwidth of the tested radio frequency transmission link;
thirdly, determining SAR load characteristics;
the SAR load characteristics comprise a duty cycle Dc; pulse width Pw; an antenna beam width α; the test position is a distance r from the antenna port surface; load integration time t int The method comprises the steps of carrying out a first treatment on the surface of the Determining whether the load antenna scans, if so, determining the scanning time t r If antenna scanning is not needed, the scanning time does not need to be determined;
fourth, setting the testing field intensity instrument as a maximum holding mode, and testing the electromagnetic leakage field intensity of the testing position to obtain a testing result E 1 ；
Fifth, according to the load characteristics, the test result E obtained in the fourth step is tested 1 Correcting;
in the fifth step, the test result E is tested according to the load characteristics 1 The correction method comprises the following steps:
(1) Test result E according to load antenna scanning characteristics 1 Correction is made, if the load is not in scan mode, then no correction is required for E 1 Correction is performed, and if the load is in the scanning mode, E is performed according to the following equation 1 And (3) correction:
wherein E is 2 The field intensity is corrected according to the load scanning characteristics; ec is a delay correction factor; t is t s Is the worst case active time;
(2) According to the duty ratio, test result E 2 Correction is performed, if the duty ratio is smaller than 0.001, the field intensity after the correction of the scanning characteristic of the load antenna is not required to be corrected, otherwise E is performed according to the following formula 2 Correcting;
wherein: e (E) p The field intensity after correction according to the duty cycle; sixthly, correcting the test result obtained in the fifth step according to the characteristics of the field intensity probe to obtain the electromagnetic leakage field intensity of the tested position;
in the sixth step, the method for correcting the test result obtained in the fifth step according to the characteristics of the field intensity probe comprises the following steps:
1) If the field intensity probe is thermocouple type, the test result does not need to be corrected again;
2) If the field strength probe is diode-type, E is performed as follows p And (3) correction:
wherein E is the field intensity corrected according to the field intensity probe characteristics; dp is the field strength probe correction factor.
2. The method for pulsed electromagnetic leakage testing of SAR-loaded satellites of claim 1, wherein:
in the first step, the connection points comprise waveguide connection points, radio frequency cable connection points and connection points between the waveguide and the radio frequency cable.
3. The method for pulsed electromagnetic leakage testing of SAR-loaded satellites of claim 1, wherein:
the field intensity probe correction factor dp is a set of data related to the measured electromagnetic field intensity and the repetition frequency of the load pulse, and is obtained through metering calibration.
4. A pulsed electromagnetic leak test method for SAR-loaded satellites according to claim 3, wherein:
the load pulse repetition frequency PRF is as follows:
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830407A (en) * | 2012-09-18 | 2012-12-19 | 桂林电子科技大学 | Method and system for automatically testing anti-interference performance of Beidou receiver |
| CN107466063A (en) * | 2017-07-10 | 2017-12-12 | 中国空间技术研究院 | A kind of telecommunication satellite multi-beam wireless method of testing |
| CN109142888A (en) * | 2018-09-25 | 2019-01-04 | 北京空间飞行器总体设计部 | A kind of satellite electromagnetic leakage localization method and system |
| CN109239467A (en) * | 2018-07-24 | 2019-01-18 | 中国空间技术研究院 | It is a kind of towards multiposition, the satellite capsule plate electromagnetic leakage detection device of wide-band and method |
| CN112395683A (en) * | 2020-09-29 | 2021-02-23 | 北京空间飞行器总体设计部 | SAR load satellite radiation model satellite design method |
| CN113170009A (en) * | 2018-11-30 | 2021-07-23 | 高通股份有限公司 | Device and method for detecting transverse electromagnetic radiation and device grip for controlling signal emission |
-
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- 2021-12-07 CN CN202111486371.1A patent/CN114264888B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830407A (en) * | 2012-09-18 | 2012-12-19 | 桂林电子科技大学 | Method and system for automatically testing anti-interference performance of Beidou receiver |
| CN107466063A (en) * | 2017-07-10 | 2017-12-12 | 中国空间技术研究院 | A kind of telecommunication satellite multi-beam wireless method of testing |
| CN109239467A (en) * | 2018-07-24 | 2019-01-18 | 中国空间技术研究院 | It is a kind of towards multiposition, the satellite capsule plate electromagnetic leakage detection device of wide-band and method |
| CN109142888A (en) * | 2018-09-25 | 2019-01-04 | 北京空间飞行器总体设计部 | A kind of satellite electromagnetic leakage localization method and system |
| CN113170009A (en) * | 2018-11-30 | 2021-07-23 | 高通股份有限公司 | Device and method for detecting transverse electromagnetic radiation and device grip for controlling signal emission |
| CN112395683A (en) * | 2020-09-29 | 2021-02-23 | 北京空间飞行器总体设计部 | SAR load satellite radiation model satellite design method |
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