阅读说明：本技术 一种多检波方式辐射杂散测试方法及检测系统 (Multi-detection mode radiation stray test method and detection system ) 是由 曹珺飞 黄开阳 梁勇 马守健 王磊 杨洪斌 于 2021-08-31 设计创作，主要内容包括：本发明提供了一种多检波方式辐射杂散测试方法及检测系统,该测试方法包括：将被测设备的最差方向放置在远离接收天线的泡沫桌上,设置自动识别杂散信号的功率值阈值,分别设置接收天线的极化方向和垂直方向,并将天线高度从低到高升降,转台从0度到360度旋转,得到对应的3个不同的扫描曲线的结果图；获得功率值阈值的信号中功率最大的杂散信号所在的频率点,控制频谱分析仪将这个频点放大到100MHz或者50MHz的频带显示中,按照前述步骤以更慢的速度再次进行扫描,确定转台固定角度和接收天线固定高度,最后再次进行扫描,获得测试数据。本发明的技术方案提升测试效率,降低测试时间成本,进一步提高辐射杂散测试结果的准确性。(The invention provides a multi-detection mode radiation stray test method and a detection system, wherein the test method comprises the following steps: placing the worst direction of the tested equipment on a foam table far away from a receiving antenna, setting a power value threshold for automatically identifying stray signals, respectively setting the polarization direction and the vertical direction of the receiving antenna, lifting the height of the antenna from low to high, and rotating a turntable from 0 degree to 360 degrees to obtain corresponding result graphs of 3 different scanning curves; and obtaining a frequency point where the stray signal with the maximum power in the signals with the power value threshold is located, controlling a spectrum analyzer to amplify the frequency point to be displayed in a frequency band of 100MHz or 50MHz, scanning again at a slower speed according to the steps, determining the fixed angle of the rotary table and the fixed height of the receiving antenna, and finally scanning again to obtain test data. The technical scheme of the invention improves the testing efficiency, reduces the testing time cost and further improves the accuracy of the radiation stray testing result.)

1. A multi-detection mode radiation stray test method is characterized by comprising the following steps:

step S1, determining the worst direction of the tested device by measuring the transmitting power of the tested device in all directions, and placing the worst direction of the tested device on a foam table far away from the receiving antenna;

step S2, importing a test path parameter file, and controlling the spectrum analyzer to set three different scanning curves for scanning;

step S3, setting parameters and setting a power value threshold of a frequency process for automatically identifying the spurious signals;

step S4, setting the horizontal polarization direction of the receiving antenna, raising the height of the antenna from low to high, rotating the turntable for placing the tested equipment from 0 degree to 360 degrees, and maintaining the testing state of the spectrum analyzer to obtain corresponding result graphs of 3 different scanning curves;

step S5, setting the receiving antenna to be in a vertical polarization direction, enabling the antenna to ascend and descend from low to high, enabling the turntable to rotate from 0 degree to 360 degrees, and enabling the spectrum analyzer to keep a test state to obtain corresponding result graphs of 3 different scanning curves;

step S6, identifying the frequency point where the spurious signal with the maximum power is located in the signals of which the first scanning curve exceeds the power value threshold set in the step S5 in the test results of the step S4 and the step S5; for the frequency point, controlling a spectrum analyzer to amplify the frequency point to a frequency band display of 100MHz or 50MHz, and keeping other settings of the spectrum analyzer consistent with full-band scanning;

and step S7, switching the antenna to the polarization corresponding to the maximum stray signal found in the full-band scanning, raising the antenna from low to high by adopting the lifting speed slower than that in the step S4, scanning, finding the value of the maximum stray signal, recording the height of the antenna at the moment, and finally fixing the antenna at the height.

2. Step S8, rotating the turntable from 0 degree to 360 degrees at a speed slower than that of the steps S4 and S5, scanning, finding the value of the maximum stray signal, recording the angle of the turntable at the moment, and finally fixing the turntable at the angle;

step S9, raising the antenna from low to high again at a speed slower than the raising and lowering speed in step S7, scanning, finding the value of the maximum stray signal, recording the height of the antenna at the moment, and finally fixing the antenna at the height;

step S10, setting the same three different scanning curves on the spectrum analyzer for scanning at the same time as the three different scanning curves in the step S4;

step S11, after the test is finished, storing a test result graph, and marking the power or the field intensity value of the maximum stray signal and the corresponding frequency point in three scanning curves in the graph respectively;

and step S12, recording the test data of the maximum stray signal value, wherein the test data comprises the corresponding turntable angle, antenna polarization and antenna height.

3. The multi-detection mode radiation spurious measurement method according to claim 1, wherein: the worst direction of the device under test was placed on the foam table 3m away from the receiving antenna.

4. The multi-detection mode radiation spurious measurement method according to claim 2, wherein: the three different scanning curves are respectively:

first scanning curve: the detection mode is set to peak, trace is set to max hold,

second scanning curve: the detection mode is set to RMS, trace is set to max hold,

third scan curve: the detection mode is set to RMS, and trace is set to average.

5. The multi-detection mode radiation spurious measurement method according to claim 3, wherein: in step S3, setting the parameters includes: setting resolution bandwidth, video bandwidth, scanning point number and scanning time, closing a built-in preamplifier of the spectrum analyzer after setting parameters, and setting a test frequency band.

6. The multi-detection mode radiation spurious measurement method according to claim 4, wherein: in steps S4, S7, and S9, the elevation from low to high is from 1m to 4m above the antenna height.

7. The method of claim 5, wherein: in step S1, the worst direction is one of a vertical placement, a horizontal placement, and a horizontal placement.

8. Before the test starts, the attenuation and spatial attenuation of the cables connected under test are calibrated.

9. A multi-detection mode radiation stray test system is characterized in that: the device comprises a control room, a power amplification room and an anechoic chamber, wherein a comprehensive tester and a computer are arranged in the control room, and a spectrum analyzer, a preamplifier and a filter are arranged in the power amplification room; the device comprises a radio anechoic chamber, a rotating table, a tested device supporting member and a receiving antenna, wherein the rotating table, the tested device supporting member and the receiving antenna are arranged on the rotating table, the tested device is arranged on the tested device supporting member, the receiving antenna is far away from the tested device, a communication antenna of the tested device is electrically connected with a comprehensive tester, the receiving antenna is electrically connected with a filter, the filter is electrically connected with a spectrum analyzer through a preamplifier, and the spectrum analyzer is electrically connected with a computer through a data interface;

controlling the integrated tester and the controller and detecting according to the multi-detection mode radiation stray test method as claimed in any one of claims 1 to 6.

10. The multi-detection mode radiation stray test system of claim 7, wherein: the rotary table is connected with a computer.

Technical Field

The invention relates to the technical field of radiation stray test of wireless communication equipment, in particular to a multi-detection mode radiation stray test method and a multi-detection mode radiation stray test detection system.

Background

The presence of radiated spurs from wireless communication devices is one of the important causes of communication interference, which severely degrades the electromagnetic environment, thereby reducing the efficiency of use of frequency resources and interfering with the normal operation of the wireless communication devices. Therefore, radiated spurs testing has been one of the main subjects of wireless communication device testing. Almost all communication systems have clear indexes on the radiation stray of the system equipment in the standard. Meanwhile, the radiated stray test is a necessary test item for the wireless communication product to carry out the compulsory certification of relevant national regulations, and is also one of the most main test indexes when the national quality inspection department carries out spot check.

According to the content of the ITU-R sm.329-11 recommendation, radiation spurs refer to radiated emissions at a frequency or frequencies outside the necessary bandwidth, the emission level of which can be reduced without affecting the transmission of the corresponding information. It includes harmonic emissions, parasitic emissions, intermodulation products and frequency conversion products, except for out-of-band emissions.

The most mature radiation stray test method at present is a far field test, and in the existing related regulations and standards, a far field test method is preferred for the test of the certification level, and whether the stray radiation level of the wireless communication equipment is within the required range of the regulations or not is further judged by testing the far field radiation characteristic of the terminal equipment in an anechoic chamber. The far-field test method and the far-field test system have the characteristics of high test result accuracy and wide test frequency range, but have the obvious defect of high test time cost. According to different regulatory standards corresponding to different wireless communication products, the radiation spurious test needs to consider test results under the conditions of different detection modes and scanning tracks. However, a conventional stray radiation test system in the market can only perform a test result of one detection mode and a scanning track at a time, and if a wireless communication product needs to consider the situations of different detection modes and scanning tracks, although the test results of different detection modes can be obtained through multiple measurement modes, such a mode will lead to the fact that the test time cost will need to be increased by multiple times, and secondly, under the situation of multiple measurement, due to the fact that the states of tested equipment and the test environment and facilities have time differences, the test results may have certain deviation, and the test comparison results of different detection modes in a true sense are not obtained.

Disclosure of Invention

Aiming at the technical problems, the invention discloses a multi-detection mode radiation spurious testing method and a multi-detection mode radiation spurious testing system, which solve the problems of overhigh time cost of spurious testing and requirements on synchronous testing and data processing of multiple detection modes, and simultaneously improve the accuracy of testing results.

In contrast, the technical scheme adopted by the invention is as follows:

a multi-detection mode radiation stray test method comprises the following steps:

step S1, determining the worst direction of the tested device by measuring the transmitting power of the tested device in all directions, and placing the worst direction of the tested device on a foam table far away from the receiving antenna;

step S2, importing a test path parameter file, and controlling the spectrum analyzer to set three different scanning curves for scanning;

step S3, setting parameters and setting a power value threshold of the frequency flow of the spurious signals;

step S4, setting the receiving antenna to be in a horizontal polarization direction, raising the height of the antenna from low to high, rotating the turntable on which the tested equipment is placed from 0 degree to 360 degrees, and keeping the testing state of the spectrum analyzer to obtain corresponding result graphs of 3 different scanning curves;

step S5, setting the receiving antenna to be in a vertical polarization direction, lifting the antenna from low to high, rotating the turntable from 0 degree to 360 degrees, and keeping the spectrum analyzer in a test state to obtain corresponding result graphs of 3 different scanning curves;

step S6, identifying the frequency point where the spurious signal with the maximum power is located in the signals of which the first scanning curve exceeds the power value threshold set in the step S5 in the test results of the step S4 and the step S5; for the frequency point, controlling a spectrum analyzer to amplify the frequency point to a frequency band display of 100MHz or 50MHz, and keeping other settings of the spectrum analyzer consistent with full-band scanning;

and step S7, switching the antenna to the polarization corresponding to the maximum stray signal found in the full-band scanning, raising the antenna from low to high by adopting the lifting speed slower than that in the step S4, scanning, finding the value of the maximum stray signal, recording the height of the antenna at the moment, and finally fixing the antenna at the height.

Step S8, rotating the turntable from 0 degree to 360 degrees at a speed slower than that of the steps S4 and S5, scanning, finding the value of the maximum stray signal, recording the angle of the turntable at the moment, and finally fixing the turntable at the angle;

step S9, raising the antenna from low to high again at a speed slower than the raising and lowering speed in step S7, scanning, finding the value of the maximum stray signal, recording the height of the antenna at the moment, and finally fixing the antenna at the height;

step S10, setting the same three different scanning curves on the spectrum analyzer for scanning at the same time as the three different scanning curves in the step S4;

step S11, after the test is finished, storing a test result graph, and marking the power or the field intensity value of the maximum stray signal and the corresponding frequency point in three scanning curves in the graph respectively;

and step S12, recording the test data of the maximum stray signal value, wherein the test data comprises the corresponding turntable angle, antenna polarization and antenna height.

At present, according to relevant standard regulations and factory customized requirements, after a full-band pre-scan test is performed on radiation stray, for high-risk stray signals within a certain margin range (for example, 6 dB) required by a limit value smaller than the relevant requirements, the test frequency range needs to be further reduced, and a confirmation scan test is performed again, so that whether a result of the confirmed radiation stray test is within the relevant required limit value range is judged. The technical scheme of the invention can automatically identify the high-risk stray signals larger than the user-defined level value in the primary test process, and then carry out the second step of test, thereby further improving the test efficiency and reducing the test cost.

As a further improvement of the invention, the worst direction of the device under test is placed on a foam table 3m away from the receiving antenna.

As a further improvement of the present invention, the three different scan curves are:

first scanning curve: the detection mode is set to peak, trace is set to max hold,

second scanning curve: the detection mode is set to RMS, trace is set to max hold,

third scan curve: the detection mode is set to RMS, and trace is set to average.

As a further improvement of the present invention, in step S3, the setting parameters include: setting resolution bandwidth, video bandwidth, scanning point number and scanning time, closing a built-in preamplifier of the spectrum analyzer after setting parameters, and setting a test frequency band.

As a further improvement of the present invention, in steps S4, S7, and S9, the raising from low to high is from 1m to 4m from the antenna height.

As a further improvement of the present invention, in step S1, the worst direction is one of a vertical placement, a lying placement, and a horizontal placement.

As a further improvement of the invention, the attenuation and spatial attenuation of the cables connected under test are calibrated before the test starts.

The invention also discloses a multi-detection mode radiation stray test system which comprises a control room, a power amplification room and an anechoic chamber, wherein the control room is internally provided with a comprehensive tester and a computer, and the power amplification room is internally provided with a spectrum analyzer, a preamplifier and a filter; the device comprises a radio anechoic chamber, a rotating table, a tested device supporting member and a receiving antenna, wherein the rotating table, the tested device supporting member and the receiving antenna are arranged on the rotating table, the tested device is arranged on the tested device supporting member, the receiving antenna is far away from the tested device, a communication antenna of the tested device is electrically connected with a comprehensive tester, the receiving antenna is electrically connected with a filter, the filter is electrically connected with a spectrum analyzer through a preamplifier, and the spectrum analyzer is electrically connected with a computer through a data interface;

controlling the integrated tester and the computer and detecting according to the multi-detection mode radiation stray test method as described in any one of the above items. Wherein, be equipped with the foam table on the equipment under test supporting member, the equipment under test is established on the foam table. The comprehensive tester adopts the prior art.

As a further improvement of the invention, the turntable is electrically connected with a computer, the rotation of the turntable can be controlled by a control program of the computer, and the operation is convenient.

Compared with the prior art, the invention has the beneficial effects that:

firstly, by adopting the technical scheme of the invention, the scanning curves of three different detection modes can be tested simultaneously, the testing efficiency is greatly improved, and the testing time cost is reduced. The test time required by the radiation stray test system for testing the radiation stray of the three detection modes in the current market is about 3H, the test time required by the invention is only 1H, the test efficiency is improved by three times, and the test time cost is reduced by one third.

Secondly, the technical scheme of the invention can further improve the accuracy of the radiation stray test result. At present, the mainstream stray radiation test scheme adopts the mode that in a full-electric wave darkroom, the heights of a tested device and a receiving antenna are fixed to be the same, the tested device is placed on a turntable to rotate for 360 degrees and simultaneously is tested, and therefore the worst turntable angle and test results are obtained. Actually, according to related test studies, it is shown that, because an anechoic chamber is not an ideal free space environment, the influence of reflection cannot be completely ignored, and meanwhile, because the height of the antenna and the center height of the device to be tested cannot be completely aligned, errors of the test height and the distance exist, so that under the condition of fixing the height of the antenna, according to the related test studies, the introduced test uncertainty can reach 0.4 dB. The test method and the test system can realize that the height of the antenna is lifted from the ground by 1m to 4m, the turntable rotates from 0 degree to 360 degrees, the spectrum analyzer keeps a test state, and in the test flow steps, the three times of confirmation processes of the maximum stray signal are carried out, the height of the antenna of the maximum stray signal is confirmed for the first time, the angle of the turntable of the maximum stray signal is confirmed for the second time, and finally the height of the antenna of the maximum stray signal is confirmed. By the method, the influence of the antenna height on the test result is corrected, and the accuracy of the test result is further improved.

Drawings

FIG. 1 is a functional block diagram of a multi-detection mode radiation spurious testing system according to the present invention.

The reference numerals include:

1-a control room, 2-a power amplifier room and 3-an anechoic chamber;

11-comprehensive tester, 12-computer;

21-spectrum analyzer, 22-preamplifier, 23-filter;

31-turntable, 32-equipment under test support member, 33-equipment under test, 34-communication antenna, 35-receiving antenna.

Detailed Description

Preferred embodiments of the present invention are described in further detail below.

As shown in fig. 1, a multi-detection mode radiation spurious measurement system includes a control room 1, a power amplifier room 2 and an anechoic chamber 3, wherein a comprehensive tester 11 and a computer (PC in the figure) 12 are arranged in the control room 1, and a spectrum analyzer 21, a preamplifier 22 and a filter 23 are arranged in the power amplifier room 2; the anechoic chamber 3 is internally provided with a rotary table 31, a tested device supporting member 32 and a receiving antenna 35 which are positioned on the rotary table 31, a tested device 33 is positioned on the tested device supporting member 32, the receiving antenna 35 is far away from the tested device 33, a communication antenna 34 of the tested device 33 is electrically connected with the comprehensive tester 11, the receiving antenna 35 is electrically connected with a filter 23, the filter 23 is electrically connected with the spectrum analyzer 21 through a preamplifier 22, and the spectrum analyzer 21 is connected with the computer 12 through a data interface.

The comprehensive tester 11 in the control room 1 is in communication connection with the equipment to be tested in the anechoic chamber 3, the equipment to be tested enters a testing state, a receiving antenna 35 in the anechoic chamber 3 receives radiation signals emitted by the equipment to be tested through a spatial link, main frequency signals which are not concerned yet in a stray test are filtered through a filter 23, the signals are amplified through a preamplifier 22 and received by a spectrum analyzer 21, and then the signals are uploaded to a computer 12 through a data interface to realize data processing and display.

Controlling a comprehensive tester and a PC (personal computer), and detecting according to the following multi-detection mode radiation stray test method, wherein the method comprises the following specific steps:

1. by measuring the emitted power in all directions of the device under test, the worst direction (vertical/lying/lateral) of the device under test is determined. The worst direction of the device under test was placed on the foam table 3m away from the feedhorn (receiving antenna).

2. Importing test path parameter file

3. Controlling the spectrum analyzer to set 3 scanning curves (trace) for scanning at the same time, wherein the 3 scanning curves respectively correspond to the following settings:

a) scanning curve 1: the detection mode is set as peak, and trace is set as max hold;

b) scanning curve 2: the detection mode is set as RMS, and trace is set as max hold;

c) scanning curve 3: the detection mode is set as RMS, and trace is set as average;

4. and setting parameters such as RBW (resolution bandwidth) and VBW (video bandwidth), scanning point number, scanning time (sweep time) and the like. The built-in preamplifier of the spectrum analyzer is turned off.

5. Setting a test frequency band

6. And setting a power value threshold of a frequency process for automatically identifying the spurious signals by software.

7. The receiving antenna is set to be in a horizontal polarization direction, the height of the receiving antenna is 1m to 4m from the ground, the rotary table rotates from 0 degree to 360 degrees, the spectrum analyzer keeps a test state, and a test data table and three corresponding scanning curve result graphs are automatically generated and kept.

8. The receiving antenna is set to be in the vertical polarization direction, the height of the receiving antenna is 1m to 4m from the ground, the rotary table rotates from 0 degree to 360 degrees, the spectrum analyzer keeps the test state, and the test data table and the corresponding three scanning curve result graphs are automatically generated and kept.

9. And (4) automatically identifying the frequency point where the spurious signal with the maximum power is located in the signals of which the scanning curve 1 exceeds the threshold value set in the step 6 in the test results of the step 7 and the step 8 by the software.

10. And for the frequency point obtained in the step 9, controlling the spectrum analyzer to amplify the frequency point to a frequency band display of 100MHz or 50 MHz. Other settings of the spectrum analyzer are consistent with the full band sweep.

11. And switching the receiving antenna to the polarization corresponding to the maximum spurious signal found in full-band scanning, raising the receiving antenna from 1m to 4m at a relatively slower speed, finding the value of the maximum spurious signal and recording the height of the antenna at the moment. Finally, the antenna is fixed at the height.

12. The turntable is rotated from 0 degrees to 360 degrees at a relatively slower speed and scanned. The value of the maximum stray signal is found and the angle of the turntable at that time is recorded. Finally, the turntable is fixed at the angle.

13. The receiving antenna is again scanned with a relatively slower speed from 1m to 4m, the value of the maximum spurious signal is found and the height of the receiving antenna at that time is recorded. Finally, the receiving antenna is fixed at the height.

14. And (3) setting 3 scanning curves (trace) on the spectrum analyzer for scanning at the same time, wherein the 23 scanning curves are respectively set as follows:

a) scanning curve 1: the detection mode is set as peak, and trace is set as max hold;

b) scanning curve 2: the detection mode is set as RMS, and trace is set as max hold;

c) scanning curve 3: the detection mode is set as RMS, trace is set as average, and the scanning frequency Sweep count is set as 100;

15. after the test is finished, a test result graph is stored, and the maximum power or field intensity value of the stray signal and the corresponding frequency point are marked in three scanning curves in the graph respectively.

16. The maximum spurious signal values are recorded in the test data (including the corresponding turret angle, antenna polarization, and antenna height) and updated into the data table generated at 13, 14.

By adopting the technical scheme of the embodiment, the method and the system for testing the radiation stray of 30MHz-40GHz of various detection modes and scanning tracks can be carried out simultaneously, the scanning curves of three different detection modes can be tested simultaneously, the testing efficiency of the radiation stray project of products in the wireless communication industry is greatly improved, the marketing period of the products is shortened, the marketing cost of the products is reduced, the competitiveness of the products is improved, and the further development of the wireless communication industry is promoted. In addition, the antenna height is controlled to rise and fall from 1m to 4m away from the ground, the rotary table rotates from 0 degree to 360 degrees, the spectrum analyzer keeps a test state, three times of confirmation processes of the maximum stray signals are performed in the flow steps of the test, the antenna height of the maximum stray signals is confirmed for the first time, the rotary table angle of the maximum stray signals is confirmed for the second time, and finally the antenna height of the maximum stray signals is confirmed. By the method, the influence of the antenna height on the test result is corrected, and the accuracy of the test result is further improved.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.