CN211653013U - High radiation field intensity test system - Google Patents
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- CN211653013U CN211653013U CN201921977034.0U CN201921977034U CN211653013U CN 211653013 U CN211653013 U CN 211653013U CN 201921977034 U CN201921977034 U CN 201921977034U CN 211653013 U CN211653013 U CN 211653013U
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Abstract
The disclosure provides a high radiation field intensity test system, and relates to the technical field of electromagnetic compatibility tests. The trial system comprises: the device comprises a signal generating source, a power amplifier, a coupler, a transmitting antenna, a receiving antenna and a stirrer arranged between the transmitting antenna and the receiving antenna, wherein the signal generating source is connected with the power amplifier, the power amplifier is connected with the coupler, the coupler is connected with the transmitting antenna, and the receiving antenna is connected with the signal generating source. The method can verify whether the tested equipment and the interconnected cable bundle thereof meet the design technical parameters or not under the irradiation of broadband, high field intensity and long-time field intensity; and the device can be ensured to keep normal functions under the high-field intensity signal environment radiated by radar, radio, television stations and other ground, water surface and air radio frequency transmitters through the examination of the high-field intensity radiation field.
Description
Technical Field
The disclosure relates to the technical field of electromagnetic compatibility testing, in particular to a high radiation field strength testing system.
Background
The field of the electromagnetic compatibility test mainly comprises an open field and an anechoic chamber, the radiation immunity (RS) of electronic and electrical equipment such as airplanes, automobiles, ships and the like is required to be higher and higher since the last 80 th century, a high-frequency radiation field HIRF is expected to be applied to large-size tested equipment, the power requirements of the measurement environment and a power amplifier thereof in the open field or the anechoic chamber are very high, and a reverberation chamber recommended by the U.S. related research institution is taken as an alternative scheme of a test method of the anechoic chamber and is gradually accepted by the field of the electromagnetic compatibility test.
The results of the radio wave darkroom radiation immunity test and the high-frequency radiation field HIRF test of the reverberation room are compared, the curves of the test results of the radio wave darkroom radiation immunity test and the high-frequency radiation field HIRF test are basically consistent, but the test time of the reverberation room is far shorter than that of the radio wave darkroom, and when complex tested equipment or a tested equipment system cannot use the radio wave darkroom to perform radiation immunity RS test, the reverberation room can be used for testing, and in addition, the construction cost of the reverberation room is obviously lower than that of the radio wave darkroom.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome prior art's not enough, provide a high radiation field intensity test system, can solve prior art and can't verify that the great equipment under test of volume meets its design technical parameter's problem under receiving broadband, high field intensity, long-time field intensity irradiation.
According to an embodiment of the present disclosure, there is provided a high radiation field strength test system, including:
the system comprises: the signal generating device comprises a signal generating source, a power amplifier, a coupler, a transmitting antenna, a receiving antenna and a stirrer arranged between the transmitting antenna and the receiving antenna, wherein the signal generating source is connected with the power amplifier, the power amplifier is connected with the coupler, the coupler is connected with the transmitting antenna, and the receiving antenna is connected with the signal generating source.
In one embodiment, the receiving antenna is disposed opposite the transmitting antenna.
In one embodiment, the frequency is within 400MHz to 1GHz, and the transmitting antenna and the receiving antenna are both log-periodic antennas; the frequency is within 400 MHz-1 GHz, and the transmitting antenna and the receiving antenna are both double ridge waveguide antennas.
In one embodiment, the system further comprises a spectrum analyzer coupled to the receive antenna.
In one embodiment, the system further comprises a radio frequency power probe connected to the receive antenna.
In one embodiment, the system further comprises a test system;
the test system comprises equipment to be tested, a frequency converter, a tester, a data converter and a display, wherein the equipment to be tested is connected with the frequency converter, the tester is connected with the frequency converter, the data converter is connected with the tester, and the display is connected with the data converter.
In one embodiment, the system further comprises a processor, the signal generating source being connected to the processor;
the processor is used for monitoring and recording the maximum forward output power P of the transmitting antenna when the stirrer rotates for a circle completely at each frequency pointrcv maxAnd average received power P of receiving antennaFwd；
And according to said maximum forward power Prcv maxAnd an average received power PFwdCalculating the quality factor Q, time constant tau and maximum field intensity E of the reverberation chambermax；
The specific calculation process is as follows:
(1) calculating a reverberation chamber calibration factor CCF of each frequency point, wherein the calculation formula is as follows:
wherein, PAve RrcIs prepared by mixingWhen the sound chamber loads the tested device, the stirrer rotates for one circle to receive the average receiving power of the antenna, and the average receiving power is a known quantity; pAveInpntWhen the tested device is loaded in the reverberation chamber, the stirrer rotates for a circle to transmit the average forward input power of the antenna, wherein the average forward input power is a known quantity;
(2) and calculating a quality factor Q of the reverberation chamber, wherein the calculation formula is as follows:
wherein CCF is a reverberation chamber calibration factor calculated according to formula 1, η T chi is an antenna efficiency factor of a transmitting antenna, which is a known quantity, η R chi is an antenna efficiency factor of a receiving antenna, which is a known quantity, and V is a volume of the reverberation chamber, which has a unit of m3Is a known amount; λ is the free space wavelength of the test frequency, in m, a known quantity;
(3) and calculating the time constant tau of the reverberation chamber, wherein the calculation formula is as follows:
wherein Q is calculated according to formula 2; f is the test frequency, which is reciprocal to λ in Hz, and is a known quantity;
(4) calculating the maximum field intensity E of the reverberant roommaxThe calculation formula is as follows:
wherein E ismaxIs the maximum field strength of the reverberation chamber, which is given in units of V/m; prcv maxThe maximum forward input power, reported for one revolution of the stirrer, in units of W, is a known quantity; λ is the free space wavelength of the test frequency, in m, a known quantity;
(5) calculating a target forward power PTar getThe calculation formula is as follows:
wherein, PTar getThe unit is dBm; edesiredIs the desired internal field strength of the reverberation chamber, in units of V/m, a known quantity; emaxHas been solved according to the formula (4); pFwdThe average received power of the receiving antenna in dBm is a known quantity for one revolution of the stirrer.
In one embodiment, the setting of the rotational speed of the agitator is performed by providing a gate modulation circuit: and when the test frequency of the signal generating source is less than 1GHz, the rotating speed of the stirrer is set to be 2r/min, and when the test frequency of the signal generating source is not less than 1GHz, the rotating speed of the stirrer is set to be 1 r/min.
In one embodiment, the signal generating source emits signals including a CW signal, a SW signal, and a PM signal.
In one embodiment, the transmitting antenna is placed in a vertical polarization direction to a corner of the shielding shell, and the receiving antenna is placed above the test bed; and the equipment to be tested is connected with a power supply through a line impedance stabilization network LISN.
The implementation of the present disclosure includes the following technical effects:
the high radiation field intensity test system provided by the disclosure can verify whether larger tested equipment and the interconnection cable bundle thereof meet and design technical parameters thereof under the irradiation of broadband, high field intensity and long-time field intensity; the high-intensity radiation field examination ensures that the tested equipment can keep normal functions under the high-intensity signal environment radiated by radar, radio, television stations and other ground, water surface and air radio frequency transmitters; in addition, the field intensity in the field intensity test system provided by the disclosure is more accurate in calculation and can be compared with the actual test field intensity.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a graph of the standard deviation allowed by the field uniformity test.
Fig. 2 is a Square Wave (SW) modulation waveform diagram.
Fig. 3 is a waveform diagram of a continuously modulated wave (CW).
Fig. 4 is a waveform diagram of a pulse modulated wave (PM).
Fig. 5 is a diagram of a reverberation room test apparatus layout.
In the figure, 1-a signal generating source, 2-a power amplifier, 3-a coupler, 4-a transmitting antenna, 5-a receiving antenna, 6-a spectrum analyzer, 7-a processor, 8-a test bed, 9-a frequency converter, 10-a tester, 11-a data converter, 12-a display, 13-a stirrer, 14-a device to be tested and 15-a power supply device.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
As shown in fig. 5, an embodiment of the present disclosure provides a high radiation field strength test system, including: a signal generating source 1, a power amplifier 2, a coupler 3, a transmitting antenna 4, a receiving antenna 5, and a stirrer 13 disposed between the transmitting antenna 4 and the receiving antenna 5, wherein the signal generating source 1 is connected to the power amplifier 2, the power amplifier 2 is connected to the coupler 3, the coupler 3 is connected to the transmitting antenna 4, and the receiving antenna 5 is connected to the signal generating source 1; wherein the coupler 3 is powered by a power supply device 15.
In one embodiment, the receiving antenna 5 is located opposite the transmitting antenna 4, as shown in fig. 1.
In one embodiment, the frequency is within 400MHz to 1GHz, and the transmitting antenna and the receiving antenna are both log-periodic antennas; the frequency is within 400 MHz-1 GHz, and the transmitting antenna and the receiving antenna are both double ridge waveguide antennas.
In one embodiment, the system further comprises a spectrum analyzer 6, said spectrum analyzer 6 being connected to said receiving antenna 5.
In one embodiment, the system further comprises a radio frequency power probe connected to the receive antenna.
In one embodiment, the system further comprises a test system;
the test system comprises a device to be tested 14, a frequency converter 9, a tester 10, a data converter 11 and a display 12, wherein the device to be tested 14 is connected with the frequency converter 9, the tester 10 is connected with the frequency converter 9, the data converter 11 is connected with the tester 10, and the display 12 is connected with the data converter 11.
In one embodiment, the system further comprises a processor 7, the spectrum analyzer 6 or radio frequency probe, and the signal generating source 1 are connected to the processor 7;
in one embodiment, the setting of the rotational speed of the agitator is performed by providing a gate modulation circuit: and when the test frequency of the signal generating source is less than 1GHz, the rotating speed of the stirrer is set to be 2r/min, and when the test frequency of the signal generating source is not less than 1GHz, the rotating speed of the stirrer is set to be 1 r/min.
In one embodiment, the signal generating source emits signals including a CW signal, a SW signal, and a PM signal.
In one embodiment, the transmitting antenna 4 is placed in a vertical polarization direction to the corner of the shielding shell, and the receiving antenna 5 is placed above the test stand 8; and the equipment to be tested is connected with a power supply through a line impedance stabilization network LISN.
The high radiation field strength test system provided by the embodiment of the disclosure is tested by the following test method, which comprises the following steps:
s1, arranging the tested equipment in the reverberation room;
s2, setting the test frequency of the signal generating source within 400 MHz-1 GHz, and installing a transmitting antenna and a receiving antenna in a reverberation room; when the test frequency of the signal generating source is set within 400 MHz-1 GHz, the transmitting antenna and the receiving antenna both adopt log-periodic antennas.
S3, calibration: injecting the signal emitted by the signal generating source into the reverberation chamber through the transmitting antenna, and monitoring and recording the maximum forward output power P of the transmitting antenna when the stirrer rotates for one circle completely at each frequency pointrcv maxAnd average received power P of receiving antennaFwdAccording to said maximum forward power Prcv maxAnd an average received power PFwdCalculating the quality factor Q, time constant tau and maximum field intensity E of the reverberation chambermax；
It should be noted that, the present disclosure may use the directional coupler and the measuring device to monitor the maximum forward output power P of the transmitting antenna when the stirrer rotates a circle completely at each frequency pointrcv maxAnd an average received power.
S4, electrifying the tested device to enable the tested device to be in a normal working mode;
s5, quality factor Q of the reverberation chamber calculated in S3, time constant tau and maximum field strength E of the reverberation chambermaxAnd modulating the carrier wave which meets the requirements of the HIRF test waveform.
S6, according to the testing level in the HIRF testing requirement, the quality factor Q of the reverberation chamber, the time constant tau and the maximum field intensity E of the reverberation chamber calculated in S3maxCalculating a target forward power PTar get。
S7, setting the rotating speed of the stirrer;
in this embodiment, the rotation speed of the agitator may be set in a gate modulation mode: when the test frequency of the signal generating source is less than 1GHz, the rotating speed of the stirrer is set to be 2r/min, and when the test frequency of the signal generating source is not less than 1GHz, the rotating speed of the stirrer is set to be 1 r/min.
S8, applying forward power on the test frequency of the signal generating source to make the test frequency of the signal generating source reach the target forward power PTar get；
In this embodiment, in the process of applying the forward power, the maximum forward output power of the transmitting antenna needs to be monitored to verify the forward power reading after the stirrer rotates completely for one circle; while monitoring the power on the receiving antenna to ascertain whether field strength is applied to the reverberation chamber.
S9, drawing a field density test level curve and a transmitting antenna input power level curve;
s10, powering off the detected equipment, setting the test frequency of the signal generating source in the frequency range of 1 GHz-18 GHz, installing a transmitting antenna and a receiving antenna in the reverberation room, and repeating S3-S9;
when the test frequency of the signal generating source is set in the frequency range of 1 GHz-18 GHz, the transmitting antenna and the receiving antenna adopt double-ridge waveguide antennas.
And S11, after the test is finished, checking the tested device and recording the detection data.
The high radiation field intensity test method provided by the disclosure can verify whether the larger tested equipment and the interconnection cable bundle thereof meet the design technical parameters or not under the irradiation of the field intensity with wide frequency band, high field intensity and long time; the high-intensity radiation field examination ensures that the tested equipment can keep normal functions under the high-intensity signal environment radiated by radar, radio, television stations and other ground, water surface and air radio frequency transmitters; in addition, the field intensity in the field intensity test system provided by the disclosure is more accurate in calculation and can be compared with the actual test field intensity.
It should be noted that, in the following description,
in S3, the minimum residence time and the minimum test frequency point are set according to the requirements in table 1 below.
TABLE 1 radio frequency susceptibility test stepping rate and dwell time
| Frequency of | Minimum dwell time | Minimum testFrequency point | |
| Less than | 1s | 10/decade frequency range | |
| Greater than | 1s | 100/decade frequency range |
In S5, the quality factor Q, the time constant tau and the maximum field intensity E of the reverberation chamber calculated in S3maxThe carrier wave was modulated in accordance with the HIRF test waveform requirements in table 2 below.
TABLE 2 HIRF test waveforms
In S6, the quality factor Q of the reverberation chamber, the time constant τ and the maximum field strength E of the reverberation chamber calculated in S3 are determined according to the test level requirements in the HIRF test requirements in Table 3 belowmaxCalculating a target forward power PTar get；
TABLE 3 HIRF (class G) test requirements List
Based on the high radiation field strength test method provided by the corresponding embodiment, another embodiment of the present disclosure provides a high radiation field strength test method, which is used for testing the maximum forward power P according to the maximum forward power Prcv maxAnd an average received power PFwdCalculating the quality factor Q and time constant tau of the reverberation chamber and the reverberation chamberMaximum field strength E ofmaxThe method comprises the following steps:
s31, calculating the reverberation chamber calibration factor CCF of each frequency point, wherein the calculation formula is as follows:
wherein, CCF is the normalized average received power of one rotation of the stirrer when the tested equipment and the auxiliary equipment are placed in the reverberation chamber, and the CCF is the quantity to be solved; pAve RrcWhen the tested equipment is loaded in the reverberation chamber, the average received power of the stirrer rotating for one circle can be directly measured; pAveInpntWhen the tested device is loaded in the reverberation chamber, the average forward input power of the stirrer during one rotation can be directly measured;
s32, for each test frequency point of 400MHz and above, calculating the quality factor of the reverberation room as Q, wherein the calculation formula is as follows:
wherein Q is the quality factor of the reverberation chamber and is the quantity to be determined, CCF is the calibration factor of the reverberation chamber and is determined according to the formula 1, η T chi is the antenna efficiency factor of the transmitting antenna and is the known quantity, η R chi is the antenna efficiency factor of the receiving antenna and is the known quantity, and V is the volume of the reverberation chamber and has the unit of m3For known quantity, after the reverberation chamber is designed, the volume of the reverberation chamber is a fixed value; λ is the free space wavelength of the test frequency, in m, a known quantity; the antenna efficiency factors of the transmitting antennas of the log periodic antenna and the double-ridge waveguide antenna are both 0.75, and the antenna efficiency factors of the receiving antennas of the log periodic antenna and the double-ridge waveguide antenna are both 0.9.
S33, calculating the time constant tau of the reverberation chamber for each test frequency point of 400MHz and above, wherein the calculation formula is as follows:
wherein tau is a time constant of the reverberation chamber and is a to-be-solved quantity; q is the quality factor of the reverberation chamber, which is calculated according to formula 2; f is the test frequency in Hz, and is a known quantity; the free space wavelength λ of the test frequency f and the test frequency f are reciprocal.
S34, calculating the maximum field intensity E of the reverberation chambermaxThe calculation formula is as follows:
wherein E ismaxThe maximum field intensity of the reverberation chamber is in the unit of V/m and is the quantity to be solved; prcv maxThe maximum forward input power, in units of W, recorded for one revolution of the stirrer, which can be measured in S3; λ is the free space wavelength of the test frequency, in m, which is a known quantity.
In one embodiment, the quality factor Q of the reverberation chamber, the time constant τ, and the maximum field strength E of the reverberation chamber calculated in S3 are usedmaxCalculating a target forward power PTar getThe calculation formula is as follows;
wherein, PTar getThe unit is dBm of the target forward power and is the quantity to be solved; ede siredThe internal field strength of the desired reverberation room, which has the unit of V/m, is a known quantity, which is the internal field strength of the reverberation room desired by the user; emaxIs the maximum field strength of the reverberation chamber, which is given by V/m, EmaxHas been solved according to the formula (4); pFwdThe average received power of the receiving antenna in dBm for one revolution of the stirrer is a known quantity, which can be measured in S3.
FIG. 1 is a graph of the standard deviation allowed by the field uniformity test. Fig. 2 is a waveform diagram of a square-wave modulated wave obtained when a signal inputted from a signal generating source is a square-wave signal SW. Fig. 3 is a waveform diagram of a continuous modulation wave obtained when a signal inputted from a signal generating source is a continuous signal SW. Fig. 4 is a pulse modulation waveform diagram obtained when the signal input from the signal generating source is the pulse signal PM.
In one embodiment, the transmitting antenna 4 is placed in a vertical polarization direction to the corner of the shielding shell, and the receiving antenna 5 is placed above the test stand 8; the device under test 14 is connected to a power supply through a line impedance stabilization network LISN.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (7)
1. A high radiation field strength testing system, said system comprising: the signal generating device comprises a signal generating source, a power amplifier, a coupler, a transmitting antenna, a receiving antenna and a stirrer arranged between the transmitting antenna and the receiving antenna, wherein the signal generating source is connected with the power amplifier, the power amplifier is connected with the coupler, the coupler is connected with the transmitting antenna, and the receiving antenna is connected with the signal generating source.
2. The high radiation field strength test system according to claim 1, wherein said receiving antenna is disposed opposite to said transmitting antenna.
3. The high radiation field strength test system according to claim 1, wherein the frequency is within 400MHz to 1GHz, and both the transmitting antenna and the receiving antenna are log periodic antennas; the frequency is within 400 MHz-1 GHz, and the transmitting antenna and the receiving antenna are both double ridge waveguide antennas.
4. The high-radiation field strength testing system according to any one of claims 1 to 3, further comprising a spectrum analyzer, said spectrum analyzer being connected to said receiving antenna.
5. The high radiation field strength test system according to any one of claims 1 to 3, further comprising a radio frequency power probe connected to said receiving antenna.
6. The high radiation field strength testing system according to any of claims 1-3, further comprising a testing system;
the test system comprises equipment to be tested, a frequency converter, a tester, a data converter and a display, wherein the equipment to be tested is connected with the frequency converter, the tester is connected with the frequency converter, the data converter is connected with the tester, and the display is connected with the data converter.
7. The high radiation field strength test system according to claim 6, wherein: the transmitting antenna is arranged in a manner of aligning to the corner of the shielding shell in a vertical polarization direction, and the receiving antenna is arranged above the test bed; and the equipment to be tested is connected with a power supply through a line impedance stabilization network LISN.
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