CN212519000U - Tuning test integrated radiation immunity automatic test system - Google Patents
Tuning test integrated radiation immunity automatic test system Download PDFInfo
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- CN212519000U CN212519000U CN202021306969.9U CN202021306969U CN212519000U CN 212519000 U CN212519000 U CN 212519000U CN 202021306969 U CN202021306969 U CN 202021306969U CN 212519000 U CN212519000 U CN 212519000U
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Abstract
The tuning and testing integrated radiation immunity automatic test system mainly comprises a test antenna oscillator (10), an antenna tuning coil (20), a coil lifting device (30), a cable (40), a bi-directional coupler (41), a test power signal source (11) and a control computer (60); the tuning and testing of the system is an integrated process controlled by the control computer 60, the whole process is carried out automatically without human intervention, and the connection mode of the cable (40) does not need to be changed in the whole tuning and testing process. 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 moreover, a special standing wave measuring instrument is not needed, and the test frequency point can be greatly increased, so that the test result is more in line with the actual use condition, and the accuracy and the effectiveness of the test result are improved.
Description
Technical Field
The utility model relates to an electromagnetic compatibility testing arrangement, especially a radiation immunity automatic test system of harmonious test integration.
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 by using a standing wave measuring instrument, and the whole testing frequency band needs to be tuned for multiple times, for example, the specific requirements of some international famous car 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 famous cars and factories in certain country
| Frequency range (MH)z） | 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, stands beside an antenna, firstly unloads an antenna test cable from a transmitter, receives a standing wave measuring system, then manually adjusts an upper switch and a lower switch and controls a coil lifting device to adjust the effective length of an antenna tuning coil, and another operator outside the darkroom simultaneously looks at a standing wave value displayed by a standing wave measuring instrument until the antenna tuning coil is adjusted to enable the standing wave of a tested antenna oscillator to be minimum, then returns the test cable to the transmitter, exits the darkroom, adjusts the transmitting power and tests. Every frequency point all needs two operators 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 moreover, and its induction action is influential to the antenna, and during the test, the operator is not on the antenna edge, and the standing wave state of antenna at this moment 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 utility model provides a tuning test integration's radiation immunity automatic test system, this system not only require to reduce the tuning time, improve harmonious and efficiency of software testing, avoid the influence of operator's human body to the antenna among the harmonious process, avoid the repeatability that artifical harmonious brought poor, problem that the tuning precision is low, can improve the accuracy and the validity of test result moreover, still do not need special standing wave measuring instrument simultaneously.
The technical scheme is as follows: the utility model provides a technical scheme that its technical problem adopted is:
the utility model discloses a tuning test integrated radiation immunity automatic test system, its characterized in that this tuning test integrated radiation immunity automatic test system includes test antenna oscillator, antenna tuning coil, coil elevating gear, coil push rod, cable, two directional coupler, measurement control line, forward power meter, reflected power meter, test power signal source and control computer; testing the antenna oscillator, the antenna tuning coil and the coil lifting device in a darkroom; the bi-directional coupler, the forward power meter, the reflection power meter, the test power signal source and the control computer are arranged outside the darkroom; the control computer is connected with the test power signal source, the forward power meter, the reflection power meter and the coil lifting device through the measurement control line; the test power signal source is connected with the input end of the bi-directional coupler, and the output end of the bi-directional coupler is connected with the antenna port of the test antenna oscillator through a cable; the forward power coupling end of the double directional coupler is connected with the forward power meter, and the reflected power coupling end of the double directional coupler is connected with the reflected power meter; the cable passes through the side wall of the darkroom through the feed-through connector on the side wall of the darkroom; the antenna tuning coil is positioned at the bottom of the antenna oscillator to be tested, and the coil lifting device can drive the coil push rod to control and change the effective length of the antenna tuning coil so as to change the resonant frequency of the antenna oscillator to be tested;
the tuning test of the tuning test integrated radiation immunity automatic test system comprises the following steps;
step 1: starting a test power signal source, wherein the output power of the test power signal source is not excessive, so that the test equipment is prevented from being burnt due to large antenna emission, and a control computer sets the frequency of the test power signal source as a test frequency point;
step 2: the control computer drives the coil push rod by the coil lifting device through a measurement control line, so that the effective length of the antenna tuning coil is minimum;
and step 3: the control computer reads the power value P of the forward power meter at the momentfAnd power value P of reflected power meterrThen, the reflection coefficient amplitude R at the moment is calculated according to the following formula and is stored in a control computer,
in the above formula CfIs the forward coupling coefficient of the bi-directional coupler, is the reflection coupling coefficient;
and 4, step 4: if the calculated reflection coefficient amplitude does not meet the test requirement, the control computer enables the coil lifting device to drive the coil push rod through a measurement control line, so that the antenna tuning coil is sequentially advanced to a new effective length from the previous effective length in an ascending manner, and then the step 3 is carried out; otherwise, entering step 5;
and 5: controlling a computer to set the output power of a test power signal source so that the power from the test power signal source to a test antenna element is equal to the test power;
step 6: testing the immunity of the cable;
and 7: if all the test frequency points are tested, ending the test; otherwise, the control computer sets the power of the test power signal source to a smaller value, sets the frequency of the test power signal source as a new test frequency point, and enters step 2.
And a control computer is used for driving the coil push rod by the coil lifting device, changing the effective length of the antenna tuning coil and changing the working frequency of the antenna oscillator to be tested.
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 the change of the reflection coefficient amplitude of the test antenna element is not greater than a set value when the position of the antenna tuning coil at any effective length changes the maximum step length, and the set value can be determined according to the accuracy requirement of the test, and can be set to 0.005, for example.
The test antenna element may be any tuned antenna or antenna array that can be controlled by a coil lifting device.
The tuning and testing of the system are integrated by the control computer, so that the whole process is automatically carried out without human intervention, and in the whole tuning and testing process, the connection mode of a cable is not required to be changed, and an operator is always out of a darkroom, so that the testing efficiency is improved, and the reliability of a testing result is also improved.
Since the entire tuning and testing process is under computer control, all tuning test parameters can be recorded by the computer in their positions, and these parameters can be reused on different vehicles of the same body structure.
Has the advantages that: the utility model has the advantages that: the tuning-testing integrated radiation immunity automatic testing system not only can greatly reduce tuning time and improve tuning and testing efficiency, but also can avoid the influence of human bodies of operators on the antenna in the tuning process, and avoid the problems of poor repeatability and low tuning precision caused by manual tuning. In addition, the system does not need a special standing wave measuring instrument, 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 the automatic radiation immunity testing system with integrated tuning and testing of the present invention.
There are shown a test antenna element 10, an antenna port 101, an antenna housing 102, a test power signal source 11, an antenna tuning coil 20, a coil lifting device 30, a coil pusher 31, a cable 40, a bi-directional coupler 41, an input terminal 410, an output terminal 411, a forward power coupling terminal 412, a forward power meter 413, a reflected power coupling terminal 414, a reflected power meter 415, a measurement control line 416, a darkroom 50, a feed-through connector 51 and a control computer 60.
Detailed Description
The following description will further explain embodiments of the present invention by referring to the drawings and examples. The specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the invention to the specific embodiments; based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The utility model discloses the embodiment that adopts is:
the tuning and testing integrated radiation immunity automatic test system is characterized by comprising a test antenna oscillator 10, an antenna tuning coil 20, a coil lifting device 30, a coil push rod 31, a cable 40, a bi-directional coupler 41, a measurement control line 416, a forward power meter 413, a reflected power meter 415, a test power signal source 11 and a control computer 60; testing the antenna element 10, the antenna tuning coil 20 and the coil lifting device 30 in a darkroom 50; the bi-directional coupler 41, the forward power meter 413, the reflected power meter 415, the test power signal source 11 and the control computer 60 are outside the darkroom 50; the control computer 60 is connected with the test power signal source 11, the forward power meter 413, the reflection power meter 415 and the coil lifting device 30 through a measurement control line 416; the test power signal source 11 is connected with the input end 410 of the bi-directional coupler, and the output end 411 of the bi-directional coupler is connected with the antenna port 101 of the test antenna element 10 through the cable 40; the forward power coupling end 412 of the dual directional coupler 41 is connected with a forward power meter 413, and the reflected power coupling end 414 of the dual directional coupler 41 is connected with a reflected power meter 415; the cable 40 passes through the wall of the dark room 50 through a feed-through connector 51 on the wall of the dark room 50; the antenna tuning coil 20 is positioned at the bottom of the test antenna element 10, and 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 tuning test of the tuning test integrated radiation immunity automatic test system comprises the following steps;
step 1: starting the test power signal source 11, wherein the output power of the test power signal source is not too high, so that the test equipment is prevented from being burnt due to large antenna emission, and the control computer 60 sets the frequency of the test power signal source 11 as a test frequency point;
step 2: the control computer 60 causes the coil lifting device 30 to drive the coil pusher 31 via the measurement control line 416 such that the effective length of the antenna tuning coil 20 is minimized;
and step 3: the control computer 60 reads the power value P of the forward power meter 413 at this timefAnd power value P of reflected power meter 415rThen, the reflection coefficient amplitude R at that time is calculated according to the following formula and stored in the control computer 60,
in the above formula CfIs the forward coupling coefficient of the bi-directional coupler 41, is the reflection coupling coefficient;
and 4, step 4: if the calculated reflection coefficient amplitude does not meet the test requirement, the control computer 60 causes the coil lifting device 30 to drive the coil pushing rod 31 through the measurement control line 416, causes the antenna tuning coil 20 to step from the previous effective length to the new effective length in an ascending order, and then proceeds to step 3; otherwise, entering step 5;
and 5: the control computer 60 sets the output power of the test power signal source 11 such that its power to the test antenna element 10 is equal to the test power;
step 6: testing the immunity of the cable;
and 7: if all the test frequency points are tested, ending the test; otherwise, the control computer 60 sets the power of the test power signal source 11 to a smaller value, sets the frequency of the test power signal source 11 as a new test frequency point, and enters step 2.
Using the control computer 60, the coil lifting device 30 drives the coil push rod 31 to change the effective length of the antenna tuning coil 20 and change the operating frequency of the test antenna element 10.
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 reflection coefficient amplitude of the test antenna element 10 is not greater than a set value when the maximum step length of the change of the position of the antenna tuning coil 20 at any effective length is changed, and the set value can be determined according to the accuracy requirement of the test, and can be set to 0.005, for example.
The test antenna element 10 may be any tuning antenna or antenna array that can be controlled by a coil lifting device, and the lower part of the test antenna element 10 is an antenna housing 102 and the bottom thereof is an antenna port 101.
In order to find the effective length of the antenna tuning coil 20 corresponding to the test frequency earlier and improve the tuning efficiency, the steps 2 and 4 may be changed as follows according to the arrangement of the frequencies of the test frequency points from small to large or from large to small: step 2 is changed as follows: the control computer 60 causes the coil lifting device 30 to drive the coil pusher 31 via the measurement control line 416 so that the effective length of the antenna tuning coil 20 is maximized; step 4 is changed into: if the calculated reflection coefficient amplitude does not meet the test requirement, the control computer 60 causes the coil lifting device 30 to drive the coil pushing rod 31 through the measurement control line 416, causes the antenna tuning coil 20 to step to a new effective length in descending order from the previous effective length, and then enters step 3; otherwise, go to step 5.
In order to ensure the minimum reflection at each test frequency point, the whole tuning measurement step can be changed as follows:
step 1: starting the test power signal source 11, wherein the output power of the test power signal source is not too high, so that the test equipment is prevented from being burnt due to large antenna emission, and the control computer 60 sets the frequency of the test power signal source 11 as a test frequency point;
step 2: the control computer 60 causes the coil lifting device 30 to drive the coil pusher 31 via the measurement control line 416 such that the effective length of the antenna tuning coil 20 is minimized;
and step 3: the control computer 60 reads the power value P of the forward power meter 413 at this timefAnd power value P of reflected power meter 415rThen, the reflection coefficient amplitude R at that time is calculated according to the following formula and stored in the control computer 60,
in the above formula CfIs the forward coupling coefficient of the bi-directional coupler 41, is the reflection coupling coefficient;
and 4, step 4: if the antenna tuning coil 20 does not traverse all the effective lengths, the control computer 60 causes the coil lifting device 30 to drive the coil pusher 31 via the measurement control line 416, so that the antenna tuning coil 20 is sequentially stepped up from the previous effective length to the new effective length, and then proceeds to step 3; otherwise, entering step 5;
and 5: the control computer 60 compares the reflection coefficient amplitudes of the antenna tuning coils 20 at all effective lengths to obtain the effective length of the antenna tuning coil 20 with the smallest reflection coefficient amplitude at the test frequency;
step 6: if all the test frequency points are traversed, entering step 7, otherwise, setting the frequency of the test power signal source 11 as a new test frequency point, and entering step 2;
and 7: the control computer 60 resets the frequency of the test power signal source 11 to the first test frequency point;
and 8: the control computer 60 sets the output power of the test power signal source 11 such that its power to the test antenna element 10 is equal to the test power; the control computer 60 causes the coil lifting device 30 to drive the coil pushing rod 31 through the measurement control line 416, so that the effective length of the antenna tuning coil 20 is located at the effective length with the minimum reflection coefficient amplitude under the test frequency;
and step 9: testing the immunity of the cable;
step 10: if all the test frequency points are tested, ending the test; otherwise, the control computer 60 sets the frequency of the test power signal source 11 as a new test frequency point, and then proceeds to step 8.
Because the utility model discloses tuning and test are the integration process by control computer 60 control, and whole process is automatic goes on, does not need the human intervention, in whole tuning test procedure, need not change cable 40's connected mode, and the operator is outside darkroom 50 all the time, has so not only improved efficiency of software testing, has also improved the reliability of test result.
The following table compares the time of the tuning test of the present invention with the prior art.
| Existing tuning test system | The utility model discloses harmonious 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 the control of the computer, the tuning parameters of the tested antenna element 10 at all positions within the antenna tuning coil 20 can be recorded by the computer, and these parameters can be reused on different vehicles of the same body structure, and the testing time of subsequent vehicles can be reduced.
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.
According to the above, alright realize the utility model discloses.
The above is only the embodiment of the present invention, and the embodiment is for better explaining the principle and practical application of the present invention, so as to make those skilled in the art understand and utilize the present invention well, the embodiment does not describe all the details in detail, and is not used to limit the present invention, any modification, equivalent replacement, improvement, etc. within the design method and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A tuning-testing integrated radiation immunity automatic test system is characterized by comprising a test antenna oscillator (10), an antenna tuning coil (20), a coil lifting device (30), a coil push rod (31), a cable (40), a bi-directional coupler (41), a measurement control line (416), a forward power meter (413), a reflection power meter (415), a test power signal source (11) and a control computer (60); testing the antenna oscillator (10), the antenna tuning coil (20) and the coil lifting device (30) in a darkroom (50); the bi-directional coupler (41), the forward power meter (413), the reflected power meter (415), the test power signal source (11) and the control computer (60) are arranged outside the darkroom (50); the control computer (60) is connected with the test power signal source (11), the forward power meter (413), the reflection power meter (415) and the coil lifting device (30) through a measurement control line (416); the test power signal source (11) is connected with the input end (410) of the bi-directional coupler, and the output end (411) of the bi-directional coupler is connected with the antenna port (101) of the test antenna element (10) through a cable (40); a forward power coupling end (412) of the double directional coupler (41) is connected with a forward power meter (413), and a reflected power coupling end (414) of the double directional coupler (41) is connected with a reflected power meter (415); the cable (40) passes through the side wall of the camera chamber (50) through a feed-through connector (51) on the side wall of the camera chamber (50); the antenna tuning coil (20) is positioned at the bottom of the antenna element (10) to be tested, and 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 antenna element (10) to be tested can be changed.
2. The automatic radiation immunity testing system integrated with tuning test as claimed in claim 1, wherein the control computer (60) is used to make the coil lifting device (30) drive the coil push rod (31) to change the effective length of the antenna tuning coil (20) and change the working frequency of the antenna element (10) to be tested.
3. An automatic testing system for radiation immunity integrated with tuning test 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 wave.
4. The automatic testing system for radiation immunity of tuning and testing integration according to claim 1, characterized in that the maximum step length of the change of the effective length of the antenna tuning coil (20) is such that the change of the reflection coefficient amplitude of the test antenna element (10) is not more than a set value when the maximum step length of the change of the position of the antenna tuning coil (20) at any effective length is changed, and the set value can be determined according to the accuracy requirement of the test.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021306969.9U CN212519000U (en) | 2020-07-07 | 2020-07-07 | Tuning test integrated radiation immunity automatic test system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021306969.9U CN212519000U (en) | 2020-07-07 | 2020-07-07 | Tuning test integrated radiation immunity automatic test system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111669229A (en) * | 2020-07-07 | 2020-09-15 | 南京容向测试设备有限公司 | Tuning test integrated radiation immunity automatic test system |
-
2020
- 2020-07-07 CN CN202021306969.9U patent/CN212519000U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111669229A (en) * | 2020-07-07 | 2020-09-15 | 南京容向测试设备有限公司 | Tuning test integrated radiation immunity automatic test system |
| CN111669229B (en) * | 2020-07-07 | 2024-07-30 | 南京容向测试设备有限公司 | Tuning test integrated radiation immunity automatic test system |
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