CN111624432A - Radiation immunity automatic test system - Google Patents
Radiation immunity automatic test system Download PDFInfo
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- CN111624432A CN111624432A CN202010643892.2A CN202010643892A CN111624432A CN 111624432 A CN111624432 A CN 111624432A CN 202010643892 A CN202010643892 A CN 202010643892A CN 111624432 A CN111624432 A CN 111624432A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
Abstract
The radiation immunity automatic test system mainly comprises a test antenna oscillator (10), a test power signal source (11), an antenna tuning coil (20), a coil lifting device (30), a coil push rod (31), a cable (40), a standing wave measuring instrument (41) and a control computer (60); firstly, in a tuning stage, measuring the standing wave ratio of all test frequency points when each stretching length of an antenna tuning coil (20) in a test antenna oscillator (10) is measured, and further obtaining the optimal stretching length with the smallest standing wave ratio of each test frequency point; and then, in the test process, setting the extension length at the optimal length at each test frequency point, and then testing. The system can greatly reduce tuning time, improve testing efficiency, and avoid the problems of poor tuning influence and repeatability and low tuning precision caused by operators in the tuning process. And the test frequency point can be greatly increased, so that the test result is more consistent with the actual use condition, and the accuracy and the effectiveness of the test result are improved.
Description
Technical Field
The invention relates to an electromagnetic compatibility testing device, in particular to an automatic radiation immunity testing system.
Background
International standard ISO 11451-3 "test method for electrical disturbance of whole vehicle by narrow-band radiation electromagnetic energy of road vehicle part 3: the vehicle transmitter simulation law states that the Voltage Standing Wave Ratio (VSWR) of the tested antenna element should be less than 2 (VSWR <2: 1) at the time of testing. Because the relative bandwidth of the test frequency band (1.8 MHz-30 MHz) is very wide, the traditional method needs a plurality of test antenna elements to cover the whole test frequency band, thus not only having high cost, but also having complex test process. Another prior art technique uses a tuned antenna as the test antenna element, which only requires one test antenna element. Since the minimum wavelength of the test band is also 10 meters, the size of the test antenna element is generally much smaller than the wavelength, so that reactive loading is required to tune the antenna to the test frequency using the loaded reactive element. Since the test frequency band is very wide, a set of fixed reactance values cannot cover the whole test frequency band, and therefore the test frequency band needs to be divided into a plurality of sub-frequency bands. During testing, each sub-band needs to be tuned, and the whole testing band needs to be tuned for multiple times, for example, the specific requirements of some international famous automobile manufacturer are as follows: the antenna needs to be tuned to each individual test frequency as indicated in table 1 before applying the power specified by the test class.
TABLE 1 frequency points for testing by some internationally famous car manufacturers
| Frequency range (MHz) | Default test frequency (MHz) | Testing frequency tolerance (kHz) |
| 1.8 to 2.0 | 1.8, 1.9, 2.0 | ± 25 |
| 3.5 to 4.0 | 3.5, 3.61, 4.0 | ± 25 |
| 7.0 to 7.3 | 7.2 | ± 25 |
| 10.1 to 10.15 | 10.10 | ± 25 |
| 14.0 to 14.35 | 14.20 | ± 50 |
| 18.07 to 18.17 | 18.10 | ± 50 |
| 21 to 21.45 | 21.20 | ± 50 |
| 24.89 to 24.99 | 24.90 | ± 50 |
| 26.18 to 28.0 | 26.30, 27.20 | ± 50 |
| 28.0 to 29.7 | 28.2, 29.50 | ± 50 |
This requires tuning at least 16 frequency points. During each tuning, an operator firstly enters a darkroom and stands beside an antenna, firstly, an antenna test cable is detached from a transmitter and is connected to a standing wave measuring instrument, then, the position of an antenna tuning coil in a test antenna oscillator is adjusted by manually adjusting an upper switch and a lower switch and controlling a direct current motor, the standing wave value displayed by the standing wave measuring instrument is seen until the position of the antenna tuning coil in the test antenna oscillator is adjusted to be the minimum standing wave, then, the test cable is connected back to the transmitter, and the operator exits the darkroom, adjusts the transmitting power and tests. Every frequency point all needs to carry out above-mentioned antenna tuning process once, and whole test procedure is spent time many, inefficiency like this, and during the debugging, the operator stands on the antenna edge, and its induction effect has an influence to the antenna, and during the test, the operator is not on the antenna edge, and the standing wave state of this moment antenna is different with during tuning, and this kind of difference also causes adverse effect to the test, and tuning precision receives the influence of operator's action in addition, and the repeatability is poor. Because the debugging test efficiency is low, the test frequency point cannot be too much. The test frequency points are few, the characteristics of the vehicle-mounted transmitter in the whole frequency band cannot be completely detected, and sometimes the vehicle-mounted transmitter does not meet the index requirements on the frequency points except the measurement frequency points, so that the accuracy and the effectiveness of the test result are influenced.
Disclosure of Invention
The invention provides an automatic radiation immunity testing system which not only requires to reduce tuning time, improve tuning and testing efficiency, avoid the influence of human bodies of operators on antennas in the tuning process, avoid the problems of poor repeatability and low tuning precision caused by manual tuning, but also can improve the accuracy and effectiveness of test results.
The technical scheme is as follows: the technical scheme adopted by the invention for solving the technical problems is as follows:
the automatic radiation immunity testing system is characterized by comprising a testing antenna oscillator, a testing power signal source, an antenna tuning coil, a coil lifting device, a coil push rod, an antenna tuning control line, a cable, a standing wave measuring instrument and a control computer, wherein the testing antenna oscillator is connected with the antenna tuning coil; testing the antenna oscillator, the antenna tuning coil, the coil lifting device and the coil push rod in a darkroom; the test power signal source, the standing wave measuring instrument and the control computer are arranged outside the darkroom, and the control computer is connected with the test power signal source and the standing wave measuring instrument through a measurement control line; the inner end of the cable is connected with an antenna port of the test antenna oscillator, the cable passes through the side wall of the darkroom through a feed-through connector on the side wall of the darkroom, and the outer end of the cable is arranged outside the darkroom; the antenna tuning coil is positioned at the bottom of the test antenna oscillator; the coil lifting device can drive the coil push rod to control and change the effective length of the antenna tuning coil, so that the resonant frequency of the antenna oscillator to be tested can be changed; the inner end of the antenna tuning control line is connected with the coil lifting device, and the outer end of the antenna tuning control line is connected with a control computer outside the darkroom;
firstly, tuning a test antenna oscillator, wherein the tuning step is as follows;
tuning step 1: connecting the outer end of the cable to a standing wave measuring instrument;
and 2, tuning: controlling a computer to drive a coil push rod by a coil lifting device through an antenna tuning control line, so that the effective length of an antenna tuning coil is minimum;
and 3, tuning: the standing wave measuring instrument measures the voltage standing wave ratios of the test antenna oscillator at all the test frequency points, and sends the measurement results of the voltage standing wave ratios of all the test frequency points to the control computer through the measurement control line and stores the measurement results in the control computer;
and 4, tuning: if the antenna tuning coil traverses all the effective lengths of the antenna tuning coil, entering a tuning step 5, otherwise, controlling the computer to drive a coil push rod by a coil lifting device through an antenna tuning control line, so that the effective lengths of the antenna tuning coil are sequentially increased to a new effective length, and then entering a tuning step 3;
and 5, tuning: the control computer finds the effective length of the corresponding antenna tuning coil when the voltage standing wave ratio at each test frequency point is the minimum from the data table of the voltage standing wave ratio of the antenna oscillator when the antenna tuning coil is at different effective lengths; further obtaining the effective length of the corresponding antenna tuning coil on each test frequency point when the voltage standing wave ratio of the test antenna oscillator is minimum, namely obtaining a corresponding table of the test frequency point and the effective length of the antenna tuning coil;
the outer end of the cable is detached from the standing wave measuring instrument to finish the tuning of the antenna oscillator;
then, testing is carried out, the outer end of the cable is connected to an output port of the test power signal source, and the testing steps are as follows;
testing step 1: the control computer looks up a table from a corresponding table of the test frequency points and the effective lengths of the antenna tuning coils according to the test frequency points to obtain the effective lengths of the antenna tuning coils corresponding to the frequency points, and then drives a coil push rod by a coil lifting device through an antenna tuning control line 3 so that the antenna tuning coils are positioned at the effective lengths;
and (2) a testing step: testing the immunity of the cable;
and (3) a testing step: and if all the test frequency points are tested, ending the test, otherwise, entering the test step 1.
And a control computer is used, and the coil lifting device drives the coil push rod through the antenna tuning control line, so that the effective length of the antenna tuning coil is changed, and the working frequency of the antenna oscillator is tested.
The standing wave measuring instrument can finish the measurement of the voltage standing wave ratio on all the test frequency points at one time.
The cable is a cable with an amplitude stabilizing function so as to reduce the influence of cable movement on voltage standing waves.
The maximum step length of the change of the effective length of the antenna tuning coil should be such that when the position of any effective length of the antenna tuning coil changes the maximum step length, the change of the voltage standing wave ratio of the tested antenna element is not greater than a set value, and the set value can be determined according to the accuracy requirement of the test, and can be set to 0.05, for example.
The standing wave measuring instrument may be an integrated standing wave measuring instrument such as a network analyzer.
Because the network analyzer can finish the measurement of the voltage standing wave ratio of thousands of frequency points or even more at one time within millisecond time, the tuning efficiency is high, and therefore, the tuning test frequency point can be increased to hundreds or even more from dozens of points. Therefore, the optimal effective length of the antenna tuning coil on a single frequency point can be obtained, so that the voltage standing wave ratio of the tested antenna oscillator on the frequency point is minimum, the optimal effective length of the antenna tuning coil in a frequency band range near each frequency point can be obtained, the average voltage standing wave ratio of the tested antenna oscillator in the frequency band is minimum, and the reliability of the test result is improved.
In the whole tuning test process, the cable is manually connected for only two times, and an operator always goes out of the darkroom without entering or exiting the darkroom at each frequency point once.
In order to further avoid the situation that when tuning is switched to a test process, the outer end of the cable needs to be manually detached from the standing wave measuring instrument and connected to the output end of the test power signal source, a single-pole double-throw radio frequency switch can be added, and therefore a fully-automatic tuning test system can be formed. The figure is an explanatory diagram of an embodiment using a single pole double throw radio frequency switch instead of a manual switching cable. The outer end of the cable is connected to the fixed end of the single-pole double-throw radio frequency switch, the first non-fixed end of the single-pole double-throw radio frequency switch is connected to the test port of the standing wave measuring instrument, and the second non-fixed end of the single-pole double-throw radio frequency switch is connected to the output end of the test power signal source. When the test antenna oscillator is tuned, the switch of the single-pole double-throw radio frequency switch is connected to a first non-fixed end of the standing wave measuring instrument, and when the test antenna oscillator is tested, the switch of the single-pole double-throw radio frequency switch is connected to a second non-fixed end of the test power signal source.
In addition, the tuning and testing processes of the system are sequentially carried out in two stages in the whole testing frequency band, while the tuning and testing of the existing system are carried out alternately, namely, each frequency point is tuned once and tested once, then the frequency point is changed and tuned again and tested once, and manual operation is needed during tuning. In addition, the tuning and testing processes of the system are automatically carried out under the control of a computer, and an operator does not need to enter a darkroom during tuning, so that the efficiency of the system is greatly improved. The following table compares the time of the tuning test of the present invention to the prior art.
Since the entire tuning and testing process is under the control of the computer, all the parameters of the effective length of the antenna tuning coil can be recorded by the computer and reused on different vehicles of the same body structure.
Has the advantages that: the invention has the beneficial effects that: the automatic radiation immunity testing system not only can greatly reduce tuning time and improve tuning and testing efficiency, but also can avoid the influence of the human body of an operator on an antenna in the tuning process, and avoid the problems of poor repeatability and low tuning precision caused by manual tuning. And because on each frequency point, the antenna tuning coil traverses all height positions of the antenna tuning coil in the tested antenna oscillator, the computer can preferably select the height position of the minimum voltage standing wave ratio in the average sense of the frequency band near each tested frequency point, so that the test result is more consistent with the actual use condition, and the accuracy and the effectiveness of the test result are improved.
Drawings
FIG. 1 is a schematic diagram of an automatic radiation immunity test system of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the present invention with a radiation immunity automatic test system with a single-pole double-throw RF switch;
the figure shows that: the test antenna element 10, the test power signal source 11, the antenna port 101, the antenna housing 102, the single-pole double-throw radio frequency switch 12, the antenna tuning coil 20, the coil lifting device 30, the antenna tuning control line 310, the coil push rod 31, the cable 40, the standing wave measuring instrument 41, the measuring control line 410, the darkroom 50, the feed-through connector 51 and the control computer 60.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The specific embodiments described herein are merely illustrative of the invention and do not limit the invention to the specific embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment adopted by the invention is as follows:
the automatic radiation immunity test system is characterized by comprising a test antenna oscillator 10, a test power signal source 11, an antenna tuning coil 20, a coil lifting device 30, a coil push rod 31, an antenna tuning control line 310, a cable 40, a standing wave measuring instrument 41 and a control computer 60; testing the antenna oscillator 10, the antenna tuning coil 20, the coil lifting device 30 and the coil push rod 31 in a darkroom 50; the test power signal source 11, the standing wave measuring instrument 41 and the control computer 60 are arranged outside the darkroom 50, and the control computer 60 is connected with the test power signal source 11 and the standing wave measuring instrument 41 through a measurement control line 410; the inner end of the cable 40 is connected with the antenna port 101 of the test antenna element 10, the cable 40 passes through the side wall of the darkroom 50 through the feed-through connector 51 on the side wall of the darkroom 50, and the outer end of the cable 40 is outside the darkroom 50; the antenna tuning coil 20 is located at the bottom of the test antenna element 10; the coil lifting device 30 can drive the coil push rod 31 to control and change the effective length of the antenna tuning coil 20, so that the resonant frequency of the test antenna element 10 can be changed; the inner end of the antenna tuning control line 310 is connected with the coil lifting device 30, and the outer end of the antenna tuning control line 310 is connected with the control computer 60 outside the darkroom 50;
firstly, tuning a test antenna element 10, wherein the tuning step is as follows;
tuning step 1: connecting the outer end of the cable 40 to the standing wave measuring instrument 41;
and 2, tuning: the control computer 60 drives the coil push rod 31 by the coil lifting device 30 through the antenna tuning control line 310, so that the effective length of the antenna tuning coil 20 is minimum;
and 3, tuning: the standing wave measuring instrument 41 measures the voltage standing wave ratios of the antenna element 10 at all the test frequency points, and sends the measurement results of the voltage standing wave ratios of all the test frequency points to the control computer 60 through the measurement control line 410 and stores the measurement results in the control computer 60;
and 4, tuning: if the antenna tuning coil 20 has traversed all the effective lengths of the antenna tuning coil 20, entering a tuning step 5, otherwise, controlling the computer 60 to drive the coil push rod 31 by the coil lifting device 30 through the antenna tuning control line 310, so that the effective lengths of the antenna tuning coil 20 are sequentially advanced to a new effective length, and then entering a tuning step 3;
and 5, tuning: the control computer 60 finds the effective length of the antenna tuning coil 20 corresponding to the minimum voltage standing wave ratio at each test frequency point from the data table of the voltage standing wave ratio of the antenna oscillator 10 when the antenna tuning coil 20 is at different effective lengths at the test frequency point; further, the effective length of the corresponding antenna tuning coil 20 at each test frequency point when the voltage standing wave ratio of the test antenna oscillator 10 is minimum, that is, a corresponding table of the test frequency point and the effective length of the antenna tuning coil 20 is obtained;
the outer end of the cable 40 is detached from the standing wave measuring instrument 41, and the tuning of the antenna element 10 is completed;
then, testing is carried out, the outer end of the cable 40 is connected to the output port of the test power signal source 11, and the testing steps are as follows;
testing step 1: the control computer 60 looks up a table from a corresponding table of the test frequency points and the effective lengths of the antenna tuning coils 20 according to the test frequency points to obtain the effective lengths of the antenna tuning coils 20 corresponding to the frequency points, and drives the coil lifting device 30 to drive the coil push rod 31 through the antenna tuning control line 310 so that the antenna tuning coils 20 are located at the effective lengths;
and (2) a testing step: testing the immunity of the cable;
and (3) a testing step: and if all the test frequency points are tested, ending the test, otherwise, entering the test step 1.
Using the control computer 60, the coil lifting device 30 drives the coil push rod 31 via the antenna tuning control line 310, thereby changing the effective length of the antenna tuning coil 20 and changing the operating frequency of the test antenna element 10.
The standing wave measuring instrument 41 can complete the measurement of the voltage standing wave ratio at all the test frequency points at one time.
The cable 40 is a cable having an amplitude stabilizing function to reduce the influence of cable movement on voltage standing waves.
The maximum step length of the change of the effective length of the antenna tuning coil 20 should be such that the change of the voltage standing wave ratio of the tested antenna element 10 is not more than a set value when the position of any effective length of the antenna tuning coil 20 changes by the maximum step length, and the set value can be determined according to the accuracy requirement of the test, and can be set to 0.05, for example.
The standing wave measuring instrument 41 may be an integrated standing wave measuring instrument such as a network analyzer.
The lower part of the test antenna element 10 is an antenna housing 102, the bottom of which is an antenna port 101.
Because the network analyzer can finish the measurement of the voltage standing wave ratio of thousands of frequency points or even more at one time within millisecond time, the tuning efficiency is high, and therefore, the tuning test frequency point can be increased to hundreds or even more from dozens of points. Therefore, the optimal effective length of the antenna tuning coil 20 at a single frequency point can be obtained, so that the voltage standing wave ratio of the antenna oscillator 10 to be tested at the frequency point is the minimum, and the optimal effective length of the antenna tuning coil 20 in a frequency band range near each frequency point can be obtained, so that the average voltage standing wave ratio of the antenna oscillator 10 to be tested is the minimum in the frequency band, and the reliability of the test result is improved.
The test antenna element 10 may also employ the following tuning steps, which are as follows;
tuning step 1: connecting the outer end of the cable 40 to the standing wave measuring instrument 41;
and 2, tuning: selecting a first test frequency point;
and 3, tuning: the control computer 60 causes the coil lifting device 30 to drive the coil pushing rod 31 through the antenna tuning control line 310, so that the antenna tuning coil 20 is at the minimum effective length;
and 4, tuning: the standing wave measuring instrument 41 measures the voltage standing wave ratio of the antenna element 10 to be tested at the moment, and sends the measurement result of the voltage standing wave ratio of the test frequency point to the control computer 60 through the measurement control line 410;
and 5, tuning: if the voltage standing wave ratio meets the requirement, the control computer 60 stores the effective length of the antenna tuning coil 20 at the moment, and then enters a tuning step 6, and if the voltage standing wave ratio does not meet the requirement, the control computer 60 enables the coil lifting device 30 to drive the coil push rod 31 through the antenna tuning control line 310, so that the antenna tuning coil 20 is sequentially stepped from the previous effective length to the new effective length, and then enters a tuning step 4;
and 6, tuning: if the antenna tuning coil 20 has traversed all the test frequency points, entering a tuning step 7, otherwise, selecting the next test frequency point, and entering a tuning step 3;
a tuning step 7: the control computer 60 records the effective length of the antenna tuning coil 20 corresponding to the minimum voltage standing wave ratio at each test frequency point, that is, a corresponding table of the effective lengths of the test frequency points and the antenna tuning coil 20.
In the whole tuning test process, the cable 40 is manually connected twice, so that an operator always stays outside the darkroom 50 and does not need to enter and exit the darkroom 50 once at each frequency point.
In order to further avoid the situation that when tuning is switched to a testing process, the outer end of the cable 40 needs to be manually detached from the standing wave measuring instrument 41 and connected to the output end of the testing power signal source 11, a single-pole double-throw radio frequency switch 12 can be added, and thus a fully-automatic tuning testing system can be formed. Fig. 2 is an explanatory diagram of an embodiment using a single pole double throw radio frequency switch 12 instead of the manual switching cable 40. The outer end of the cable 40 is connected to the fixed end of the single-pole double-throw radio frequency switch 12, the first non-fixed end of the single-pole double-throw radio frequency switch 12 is connected to the test port of the standing wave measuring instrument 41, and the second non-fixed end is connected to the output end of the test power signal source 11. When the test antenna element 10 is tuned, the switch of the single-pole double-throw radio frequency switch 12 is opened to a first non-fixed end connected to the standing wave measuring instrument 41, and when in test, the switch of the single-pole double-throw radio frequency switch 12 is opened to a second non-fixed end connected to the test power signal source 11.
In addition, the tuning and testing processes of the system are sequentially carried out in two stages in the whole testing frequency band, while the tuning and testing of the existing system are carried out alternately, namely, each frequency point is tuned once and tested once, then the frequency point is changed and tuned again and tested once, and manual operation is needed during tuning. In addition, the tuning and testing processes of the system are automatically carried out under the control of a computer, and an operator does not need to enter a darkroom during tuning, so that the efficiency of the system is greatly improved. The following table compares the time of the tuning test of the present invention to the prior art.
| Existing tuning test system | The invention relates to a tuning test system | |
| Time of each test | 4 hours | First vehicle 0.5 hours |
| Prototype development | Each vehicle is tuned | Vehicle tuning of same body structure |
| Number of operators | 2 | 1 |
Since the entire tuning and testing process is under computer control, all parameters of the effective length of the antenna tuning coil 20 can be recorded by the computer and reused on different vehicles of the same body structure.
The system can reduce the electromagnetic compatibility design verification time or prototype use verification time by at least 87.5 percent, and save more time if the same vehicle body has more prototypes.
The present invention can be realized in light of the above.
The foregoing is illustrative of the present invention, and the principles and practical applications of the present invention are better understood and appreciated by those skilled in the art, and the present invention is not intended to be limited to the details, rather, the embodiments and examples are to be construed as broadly as the present invention includes all modifications, equivalents, improvements, and equivalents within the spirit and scope of the present invention.
Claims (6)
1. An automatic radiation immunity test system is characterized by comprising a test antenna oscillator (10), a test power signal source (11), an antenna tuning coil (20), a coil lifting device (30), a coil push rod (31), an antenna tuning control line (310), a cable (40), a standing wave measuring instrument (41) and a control computer (60); testing the antenna oscillator (10), the antenna tuning coil (20), the coil lifting device (30) and the coil push rod (31) in a darkroom (50); the test power signal source (11), the standing wave measuring instrument (41) and the control computer (60) are arranged outside the darkroom (50), and the control computer (60) is connected with the test power signal source (11) and the standing wave measuring instrument (41) through a measurement control line (410); the inner end of the cable (40) is connected with an antenna port (101) of the test antenna element (10), the cable (40) passes through the side wall of the darkroom (50) through a feed-through connector (51) on the side wall of the darkroom (50), and the outer end of the cable (40) is outside the darkroom (50); the antenna tuning coil (20) is positioned at the bottom of the test antenna element (10); the coil lifting device (30) can drive the coil push rod (31) to control and change the effective length of the antenna tuning coil (20), so that the resonant frequency of the test antenna oscillator (10) can be changed; the inner end of the antenna tuning control line (310) is connected with the coil lifting device (30), and the outer end of the antenna tuning control line (310) is connected with a control computer (60) outside the darkroom (50);
firstly, tuning a test antenna element (10), wherein the tuning step is as follows;
tuning step 1: connecting the outer end of the cable (40) to a standing wave measuring instrument (41);
and 2, tuning: the control computer (60) drives the coil push rod (31) by the coil lifting device (30) through an antenna tuning control line (310) so as to minimize the effective length of the antenna tuning coil (20);
and 3, tuning: the standing wave measuring instrument (41) measures the voltage standing wave ratios of the test antenna oscillator (10) at all test frequency points, and sends the measurement results of the voltage standing wave ratios of all the test frequency points to the control computer (60) through a measurement control line (410) and stores the measurement results in the control computer (60);
and 4, tuning: entering a tuning step 5 if the antenna tuning coil (20) has traversed all the effective lengths of the antenna tuning coil (20), otherwise, controlling the computer (60) to drive the coil push rod (31) by the coil lifting device (30) through the antenna tuning control line (310) so that the effective lengths of the antenna tuning coil (20) are sequentially stepped to a new effective length, and then entering a tuning step 3;
and 5, tuning: the control computer (60) finds the effective length of the corresponding antenna tuning coil (20) when the voltage standing wave ratio of the antenna oscillator (10) is minimum on each test frequency point from a data table of the voltage standing wave ratio of the test antenna oscillator (10) when the antenna tuning coil (20) is at different effective lengths; further obtaining the effective length of the corresponding antenna tuning coil (20) when the voltage standing wave ratio of the test antenna oscillator (10) is minimum at each test frequency point, namely obtaining a corresponding table of the test frequency point and the effective length of the antenna tuning coil (20);
the outer end of the cable (40) is detached from the standing wave measuring instrument (41) to finish the tuning of the antenna element (10) to be tested;
then, testing is carried out, the outer end of the cable (40) is connected to the output port of the testing power signal source (11), and the testing steps are as follows;
testing step 1: the control computer (60) looks up a table from a corresponding table of the test frequency point and the effective length of the antenna tuning coil (20) according to the test frequency point to obtain the effective length of the antenna tuning coil (20) corresponding to the frequency point, and drives the coil push rod (31) of the coil lifting device (30) through the antenna tuning control line (310) to enable the antenna tuning coil (20) to be located at the effective length;
and (2) a testing step: testing the immunity of the cable;
and (3) a testing step: and if all the test frequency points are tested, ending the test, otherwise, entering the test step 1.
2. An automatic test system for radiation immunity according to claim 1, characterized in that the control computer 60 is used to make the coil lifting device (30) drive the coil push rod (31) through the antenna tuning control line (310), to change the effective length of the antenna tuning coil (20), and to change the working frequency of the antenna element (10) under test.
3. The automatic testing system for radiation immunity of claim 1, characterized in that the standing wave measuring instrument (41) can complete the measurement of voltage standing wave ratio at all frequency points at one time.
4. An automatic test system for radiation immunity according to claim 1, characterized in that the cable (40) is a cable with amplitude stabilization function to reduce the influence of cable movement on voltage standing waves.
5. An automatic test system for radiation immunity according to claim 1, characterized in that the maximum step size for changing the effective length of the antenna tuning coil (20) is such that the voltage standing wave ratio of the antenna element (10) under test does not change more than a set value when the antenna tuning coil (20) changes the position of any effective length by the maximum step size, and the set value can be determined according to the accuracy requirement of the test, and can be set to 0.05, for example.
6. An automatic test system for radiation immunity according to claim 1 or 3, characterized in that the standing wave measuring instrument (41) is an integrated standing wave measuring instrument such as a network analyzer.
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| CN202010643892.2A CN111624432A (en) | 2020-07-07 | 2020-07-07 | Radiation immunity automatic test system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113359174A (en) * | 2021-06-07 | 2021-09-07 | 苏州大学 | Method and system for evaluating radiation resistance of unmanned aerial vehicle remote control module |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113359174A (en) * | 2021-06-07 | 2021-09-07 | 苏州大学 | Method and system for evaluating radiation resistance of unmanned aerial vehicle remote control module |
| CN113359174B (en) * | 2021-06-07 | 2023-02-10 | 苏州大学 | Method and system for evaluating radiation resistance of unmanned aerial vehicle remote control module |
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