Antenna module simulating terminal radiation, in-vehicle electromagnetic radiation test system and method

Abstract

The present invention proposes an antenna module for simulating terminal radiation, an in-vehicle electromagnetic radiation test system and method. The antenna module includes a substrate; a radiating microstrip, a feeder connected to the radiating microstrip and inputting a radio frequency signal to the radiating microstrip, and a power adjustment unit connected in series to the feeder are provided on the first surface of the substrate; a grounding layer is provided on the second surface of the substrate, the first surface and the second surface are opposite to each other, and the grounding layer covers all or part of the feeder on the second surface. The antenna module has good omnidirectionality, and the radiation power of the radiating microstrip can be flexibly adjusted by the power adjustment unit. It can highly simulate the electromagnetic radiation of the terminal device in various working modes, and solves the problem of poor consistency of test data caused by different terminal device manufacturers, placement postures and test placement positions when the terminal device is directly used for radiation testing. The system performs radiation testing in a microwave darkroom, which can avoid external signal interference and guide users to place the terminal reasonably.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic radiation testing, and in particular to an antenna module for simulating terminal radiation, and an in-vehicle electromagnetic radiation testing system and method. Background Art

[0002] As cars are undergoing major changes such as intelligence, networking, and electrification, the proportion of electronic components in the entire vehicle is increasing. However, while electronic equipment increases the intelligence and convenience of cars, it also brings a series of electromagnetic compatibility and human electromagnetic radiation problems. The use of mobile terminal devices carried by drivers and passengers, such as mobile phone calls, will aggravate the problem of human electromagnetic radiation in the car. Existing human electromagnetic protection testing technology mainly targets the 10Hz to 400KHz frequency band in the car, and there are fewer tests on high-frequency bands (such as 30MHz to 3GHz), and even fewer tests on electromagnetic radiation from mobile phones in the car when talking. Due to the different styles, placement postures, and test locations of terminal equipment in the car, the electromagnetic radiation test results of terminal equipment in the car cannot be well replicated, so it is particularly important to design alternative solutions. Summary of the invention

[0003] In order to overcome the defects existing in the above-mentioned prior art, an object of the present invention is to provide an antenna module for simulating terminal radiation, and an in-vehicle electromagnetic radiation testing system and method.

[0004] In order to achieve the above-mentioned purpose of the present invention, according to the first aspect of the present invention, the present invention provides an antenna module for simulating terminal radiation, comprising a substrate; a radiating microstrip and a feeder connected to the radiating microstrip and a radio frequency signal source are provided on the first surface of the substrate; a grounding layer is provided on the second surface of the substrate, the first surface and the second surface are opposite to each other, and the grounding layer covers all or part of the feeder on the second surface; the radiation power of the radiating microstrip is adjustable.

[0005] The beneficial effects of the above technical solution are as follows: the antenna module adopts a microstrip structure as the antenna body to radiate radio frequency signals, and the ground layer only covers all or part of the feeder on the second surface, so that the antenna module has good omnidirectionality, and the radiation power of the radiating microstrip is adjustable, which can highly simulate the electromagnetic radiation of terminal devices (such as mobile phones) from different manufacturers in various working modes (such as calls, uploading data or downloading data, etc.), thereby solving the problem of poor consistency of test data caused by different terminal device manufacturers, placement postures and test placement positions when directly using terminal devices for radiation testing; and the antenna module also has the beneficial effects of simple structure and easy processing.

[0006] In a preferred embodiment of the present invention, the output power of the radio frequency signal source connected to the feeder is adjustable; and / or a power adjustment unit is serially connected to the feeder.

[0007] The beneficial effects of the above technical solutions are: a method for realizing adjustable radiation power of the radiating microstrip is disclosed, which is easy to implement and convenient for highly simulating the electromagnetic radiation conditions of different terminal devices (such as mobile phones) in various working modes (such as calls, uploading data or downloading data, etc.).

[0008] In a preferred implementation manner of the present invention, the power adjustment unit includes an adjustment resistor, and the adjustment resistor is connected in series to the feeder.

[0009] The beneficial effects of the above technical solution are: the radiation power of the radiating microstrip is adjusted by adjusting the resistance value of the resistor. The larger the resistance value, the more energy it absorbs and the smaller the radiation power of the radiating microstrip. It has the characteristics of simple structure, low cost, and convenient and fast radiation power adjustment; and it can highly guarantee the standardization and repeatability of test data.

[0010] In a preferred embodiment of the present invention, it further comprises a radio frequency signal input interface, wherein the input end of the radio frequency signal input interface is connected to the output end of the radio frequency signal source, and the output end of the radio frequency signal input interface is connected to the feeder input end.

[0011] The beneficial effect of the above technical solution is that it is easy to connect to an external RF signal source through the RF signal input interface.

[0012] In order to achieve the above-mentioned purpose of the present invention, according to the second aspect of the present invention, the present invention provides an in-vehicle electromagnetic radiation testing system, including a microwave darkroom, a vehicle located in the microwave darkroom, a radio frequency signal source, the antenna module of the present invention placed inside the vehicle, and at least one electromagnetic detection unit arranged in the vehicle; the radio frequency signal source is arranged on the antenna module or is separated from the antenna module, and the output end of the radio frequency signal source is connected to the feeder input end; the electromagnetic detection unit detects the size of the electromagnetic radiation in the vehicle.

[0013] The beneficial effects of the above technical solution are as follows: in addition to the beneficial effects of the above antenna module, the system also has the function of performing electromagnetic radiation distribution tests on in-vehicle terminal devices in a microwave darkroom by replacing the terminal devices with the above antenna module, thereby solving the problem of poor consistency of test data caused by different terminal device manufacturers, placement postures and test placement positions when directly using the terminal devices for radiation testing, and improving the standardization and repeatability of the tests; in addition, it is convenient to guide consumers to place terminal devices reasonably, or provide data support for car companies to place T-box antenna positions during the research and development stage, thereby creating a safe driving environment for consumers; and conducting radiation tests in a microwave darkroom can avoid the influence of external interference signals on the test results, thereby improving the test precision and accuracy.

[0014] In a preferred embodiment of the present invention, when there are multiple electromagnetic detection units, the multiple electromagnetic detection units are located at different positions in the vehicle.

[0015] The beneficial effect of the above technical solution is that multiple electromagnetic detection units can detect simultaneously, which is convenient for quickly obtaining the distribution of electromagnetic radiation of terminal devices in the vehicle.

[0016] In a preferred embodiment of the present invention, it further comprises a plurality of dummies respectively placed in the driver's seat and the passenger seat, and electromagnetic detection units are arranged on different organ parts of the dummies and areas touchable by the hands of the driver's seat occupant.

[0017] The beneficial effect of the above technical solution is that it is easy to evaluate the radiation intensity to which the human organs and the areas that can be touched by the hands of the driver are subjected when the terminal equipment is in working state.

[0018] In order to achieve the above-mentioned purpose of the present invention, according to the third aspect of the present invention, the present invention provides a method for performing in-vehicle electromagnetic radiation testing based on the in-vehicle electromagnetic radiation testing system of the present invention, comprising: step S1, selecting M antenna position points for placing antenna modules and N radiation test points for deploying electromagnetic detection units in the whole or part of the interior of the vehicle respectively; the M is greater than or equal to 1, and the N is greater than or equal to 1; step S2, placing the antenna modules at the M antenna position points in turn, and after each placement of the antenna module, starting the radio frequency signal source to obtain the radiation values ​​of the N radiation test points in a time-sharing or simultaneous manner.

[0019] The beneficial effects of the above technical solution are: this method can accurately test the radiation distribution of terminal equipment in the vehicle, solves the problem of poor consistency of test data caused by different terminal equipment manufacturers, placement postures and test placement positions when directly using terminal equipment for radiation testing, and can give the electromagnetic radiation value of the terminal in the vehicle at different placement points, which is convenient for guiding users to place terminal equipment and car companies to install communication equipment antennas to avoid health risks.

[0020] In a preferred embodiment of the present invention, in step S1, antenna position points are set at least in the central control area, the bottom of the seat and the armrest area; and / or radiation test points are set at least in different organ parts of the dummy and the area touchable by the hands of the driver.

[0021] The beneficial effects of the above technical solution are as follows: antenna position points are set in areas where users often use terminal devices, making the test method extremely practical and instructive; radiation test points are set in different organ parts of the dummy and in areas that can be touched by the hands of the driver, so as to obtain the electromagnetic radiation intensity of important sensitive organs of the human body when the terminal device is in working condition, so as to guide users to place terminal devices and car companies to install communication equipment (such as T-Box) antennas to avoid health risks, making the test method more valuable.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 This is a structural front view of an antenna module in a preferred embodiment of the present invention;

[0025] Figure 2 It is a structural left side view of an antenna module in a preferred embodiment of the present invention;

[0026] Figure 3 It is a curve diagram of the resistance value of the adjustment resistor in the antenna module and the radiation efficiency of the radiation microstrip in a preferred embodiment of the present invention;

[0027] Figure 4 is a two-dimensional directional diagram of an antenna module in a preferred embodiment of the present invention;

[0028] Figure 5 It is a partial system block diagram of an in-vehicle electromagnetic radiation testing system in a preferred embodiment of the present invention.

[0029] Reference numerals:

[0030] 1. Radiating microstrip; 2. Ground layer; 3. Power conditioning unit; 4. Substrate; 5. Feed line. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0033] The present invention discloses an antenna module for simulating terminal radiation. In a preferred embodiment, Figure 1 and Figure 2 As shown, the antenna module includes a substrate 4; a radiating microstrip 1 and a feeder 5 connected to the radiating microstrip 1 and a radio frequency signal source are provided on the first surface of the substrate 4; a grounding layer 2 is provided on the second surface of the substrate 4, the first surface and the second surface are opposite to each other, and the grounding layer 2 covers all or part of the feeder 5 on the second surface; the radiation power of the radiating microstrip 1 is adjustable.

[0034] In this embodiment, the substrate 4 is preferably but not limited to a FR-4 epoxy laminated glass cloth board; the substrate 4 is preferably but not limited to a rectangular shape, and the dimensions are preferably but not limited to 80 mm in length, 50 mm in height, and 1 mm in thickness respectively; the radiation microstrip 1 and the grounding layer 2 are preferably but not limited to being formed by copper coating on the substrate 4 or being a metal sheet.

[0035] In this embodiment, preferably, the feed line 5 is a microstrip structure, and may also be a copper-clad or metal sheet.

[0036] In this embodiment, the radiation microstrip 1 is preferably, but not limited to, a closed loop structure or an open circuit structure; further, the radiation microstrip 1 may be a closed symmetrical curved structure, such as Figure 1 As shown, the two-dimensional radiation pattern of the antenna module of this structure is as follows Figure 4 As shown, it can be seen that the antenna module has good omnidirectionality. The length of the radiating microstrip 1 can be adjusted according to the frequency of the radio frequency signal, and the length of the radiating microstrip 1 is proportional to the frequency of the radio frequency signal. In order to save the layout space of the radiating microstrip 1, the radiating microstrip 1 can be bent.

[0037] In this embodiment, the ground layer 2 is preferably but not limited to being connected to the ground of the radio frequency signal source or the earth.

[0038] In a preferred embodiment, the output power of the RF signal source connected to the feeder 5 is adjustable; and / or a power adjustment unit 3 is connected in series to the feeder 5 to achieve adjustable radiation power of the radiating microstrip. Specifically, one of the following three methods is adopted: Method 1: The output power of the RF signal source is adjustable, such as selecting an RF signal source with adjustable output power; Method 2: The output power of the RF signal source is not adjustable, and a power adjustment unit 3 is connected in series to the feeder 5, such as Figure 1 and Figure 2 Mode three: The output power of the RF signal source is adjustable, and a power adjustment unit 3 is connected in series on the feeder 5 to achieve two-stage adjustment, the RF signal source can be used for coarse adjustment, and the power adjustment unit 3 can be used for fine adjustment.

[0039] In this embodiment, the RF signal source is preferably but not limited to an existing vector signal source and power amplifier with adjustable output power. The output end of the vector signal source is connected to the input end of the power amplifier, and the output end of the power amplifier is connected to the feeder. The RF signal source can also select an RF comprehensive tester with adjustable output power (such as CMD200 or CMW500, etc.), or select an existing GSM, 3G RF module product whose output power is not easy to adjust.

[0040] In this embodiment, the power adjustment unit 3 is preferably, but not limited to, a radio frequency power amplifier, or a power attenuator, or a radio frequency power amplifier and a power attenuator connected in series. The radio frequency power amplifier realizes power amplification, so that the radiation power of the radiating microstrip 1 increases and the radiation intensity increases; the power attenuator realizes power reduction, so that the radiation power of the radiating microstrip 1 decreases and the radiation intensity decreases. The radio frequency power amplifier can adopt the circuit structure disclosed in the prior art, such as the technical solution disclosed in the Chinese patent with publication number CN103812463A or CN106533374A, or the circuit structure disclosed in the website http: / / www.elecfans.com / dianlutu / 195 / 20180305643057.html. The selection of the device in the specific circuit needs to be combined with the frequency band and modulation method of the radio frequency signal, which is the prior art and will not be repeated here. The power attenuator is preferably but not limited to a T-type, π-type and bridge-type power attenuation resistor network. The specific circuit structure can refer to the circuit structure disclosed in the prior art https: / / wenku.baidu.com / view / 81468c30777f5acfa1c7aa00b52acfc789eb9f9e.html, which will not be repeated here.

[0041] In a preferred embodiment, Figure 1 and Figure 2 As shown, the power regulating unit 3 includes a regulating resistor, which is connected in series to the feeder 5 .

[0042] In this embodiment, a single adjustment resistor that is simple and easy to process and implement is used as the power adjustment unit. By using adjustment resistors with different resistance values, the radiation efficiency of the radiation microstrip 1 can be flexibly adjusted (the radiation efficiency is the percentage value of the actual radiation power of the radiation microstrip 1 and the output power of the RF signal source, or the difference between the output power of the RF signal source and the power on the adjustment resistor and the percentage value of the output power of the RF signal source), thereby achieving the purpose of highly simulating the electromagnetic waves radiated into the free space inside the car by terminal devices such as mobile phones during calls, Internet access, and video.

[0043] In this embodiment, the purpose of adding the resistor is to absorb part of the energy to reduce the antenna radiation efficiency, so as to highly simulate the actual situation that after the internal power amplifier of a terminal device such as a mobile phone outputs a set power (such as setting the GSM maximum power of 33dBm during a call), the power radiated from the terminal device is less than the set power due to the terminal device shell, antenna installation, etc. Preferably, the resistance range of the adjustment resistor is 0 to 500Ω, and the radiation efficiency curve of the radiating microstrip 1 corresponding to different resistance values ​​of the adjustment resistor is as follows: Figure 3 As shown in the figure, it can be seen that the larger the resistance value, the more energy is absorbed, and the lower the radiation efficiency of the antenna. This can ensure the validity and consistency of the test data in different test sites and different laboratories.

[0044] In an application scenario of this embodiment, the terminal device is a mobile phone, the output power of the RF signal source is set to the GSM maximum transmission power of the mobile phone in the GSM call mode, such as 33dBm, and an adjustment resistor is connected in series on the feeder 5. The resistance of the adjustment resistor is based on the power attenuation ratio of mobile phones of different manufacturers measured in advance (corresponding to Figure 3 The radiation efficiency in Figure 3 The resistance of the regulating resistor in the curve of the relationship between the radiation efficiency and the regulating resistor is determined, preferably, it can be selected in the range of 0 to 150Ω. This allows for convenient and rapid testing and research of electromagnetic radiation during a mobile phone call in a vehicle.

[0045] In a preferred embodiment, it also includes a radio frequency signal input interface, the input end of the radio frequency signal input interface is connected to the output end of the radio frequency signal source, and the output end of the radio frequency signal input interface is connected to the input end of the feeder 5.

[0046] In this embodiment, the RF signal input interface is preferably but not limited to an SMA RF connector, and the SMA RF connector is connected to the RF signal source through an RF cable with a shielding layer. Preferably, the ground layer 2 is connected to the shielding layer of the RF cable.

[0047] The present invention also discloses an in-vehicle electromagnetic radiation testing system. In a preferred embodiment, the system includes a microwave darkroom, a vehicle located in the microwave darkroom, a radio frequency signal source, the above-mentioned antenna module placed inside the vehicle, and at least one electromagnetic detection unit arranged in the vehicle; the radio frequency signal source is arranged on the antenna module or is separated from the antenna module, and the output end of the radio frequency signal source is connected to the input end of the feeder 5; the electromagnetic detection unit detects the size of the electromagnetic radiation in the vehicle.

[0048] In this embodiment, the electromagnetic detection unit is preferably, but not limited to, an electromagnetic radiation detector or an electromagnetic radiation sensor. The electromagnetic radiation detector is preferably, but not limited to, an electromagnetic frequency selector SRM3006, TES-92, a full-band electromagnetic radiation measuring instrument set EMF1 (1kHz to 6GHz) or a vector signal source, and the electromagnetic radiation sensor adopts the structure disclosed in the existing publication number CN102326255B or CN202421347U, a Hall sensor, etc. Preferably, an electro-optical conversion module and a photoelectric conversion module are provided, the output end of the electromagnetic detection unit is connected to the electrical input end of the electro-optical conversion module, the optical output end of the electro-optical conversion module is connected to the optical input end of the photoelectric conversion module, and the electrical output end of the photoelectric conversion module is connected to the signal input end of the external control module. The electromagnetic intensity signal obtained by the electromagnetic detection unit is transmitted to the outside of the microwave darkroom through the electro-optical conversion module and the photoelectric conversion module to avoid the signal interfering with the electromagnetic field of the microwave darkroom and affecting the test accuracy. The specific structure and principle of the electro-optical conversion module and the photoelectric conversion module and the technical solutions disclosed in the patents with publication numbers CN208112812U and CN208614087U in the referenced prior art are not repeated here.

[0049] In this embodiment, when the RF signal source and the antenna module are separately arranged, it can be a vector signal source plus a power amplifier. In this case, the RF signal source can be arranged inside or outside the microwave darkroom. When it is arranged outside the microwave darkroom, the RF signal is transmitted to the feeder 5 of the antenna module through an RF cable; when the RF signal source is arranged on the antenna module, the RF signal source can be a GSM RF module or a 3G RF module. The specific circuit structure can refer to the circuit composed of the RF transceiver chip, baseband chip, and RF impedance matching network of terminal equipment such as mobile phones, etc., which will not be repeated here.

[0050] In a preferred embodiment, Figure 5 As shown, when there are multiple electromagnetic detection units, the multiple electromagnetic detection units are located at different positions in the vehicle.

[0051] In this embodiment, preferably, the electromagnetic detection unit can be located at different positions of the seat.

[0052] In a preferred embodiment, it also includes a plurality of dummies placed in the driver's seat and the passenger seat respectively, and electromagnetic detection units are arranged in different organ parts of the dummies and the areas that can be touched by the hands of the driver's seat occupant.

[0053] In this embodiment, preferably, electromagnetic detection units are arranged on the dummy at locations simulating key organs of the human body, such as the brain, chest, liver, crotch, feet, and areas that can be touched by the hands of the driver.

[0054] In a preferred embodiment, a control module is further included, wherein a first control end of the control module is connected to a control end of the radio frequency signal source, and a signal input end of the control module is connected to a signal output end of the electromagnetic detection unit.

[0055] In this embodiment, the control module is preferably but not limited to a computer or an embedded processor, which can be connected to the RF signal source through a PBIO instrument connection line or a serial port line to control the start of the RF signal source and output the frequency band and power intensity of the RF signal. The control module can be connected to the electromagnetic detection unit through an A / D pin or a serial port to receive the electromagnetic intensity signal detected by the electromagnetic detection unit, which is convenient for realizing automated testing.

[0056] The present invention also discloses a method for performing in-vehicle electromagnetic radiation testing based on the in-vehicle electromagnetic radiation testing system. In a preferred embodiment, the method comprises:

[0057] Step S1, selecting M antenna position points for placing antenna modules and N radiation test points for laying out electromagnetic detection units in all or part of the area inside the vehicle, respectively; M is greater than or equal to 1, and N is greater than or equal to 1;

[0058] Step S2, placing the antenna modules at M antenna positions in sequence, and after each placement of the antenna modules, starting the radio frequency signal source, and obtaining the radiation values ​​of the N radiation test points in a time-sharing or simultaneous manner. Preferably, it also includes:

[0059] Step S3, grouping the N radiation values ​​into a set, and associating the set with the antenna position point where the current antenna module is placed;

[0060] Step S4, setting a first radiation threshold, and performing the following processing on the M sets in sequence:

[0061] Determine whether there is a radiation value greater than or equal to a first radiation threshold in the current set, if there is a radiation value greater than or equal to the first radiation threshold, mark the antenna position point associated with the set as a terminal prohibited point, if there is no radiation value greater than or equal to the first radiation threshold, mark the set;

[0062] Step S5, setting a second radiation threshold, and performing the following processing on all marked sets: calculating the average value of each set, and if the average value is less than or equal to the second radiation threshold, marking the antenna position point associated with the set as a terminal allowed placement point;

[0063] The second radiation threshold is lower than the first radiation threshold. It is possible to provide prohibited and permitted terminal placement points inside the car, so as to guide users to place terminal devices and avoid health risks.

[0064] In this embodiment, the first radiation threshold can be set according to the electromagnetic radiation intensity harmful to the human body set by the GB8702-88 organization standard. Preferably, the second radiation threshold is the minimum of all marked set average values.

[0065] In a preferred embodiment, in step S1, antenna position points are set at least in the central control area, the seat bottom and the armrest area; and / or radiation test points are set at least in different organ parts of the dummy and the area that can be touched by the hands of the driver.

[0066] Setting antenna position points in areas frequently used by users makes this test method extremely practical; setting radiation test points at different organ positions of the dummy facilitates obtaining the intensity of electromagnetic radiation of important sensitive organs of the human body by the terminal equipment, making it easier to obtain more valuable terminal prohibited placement points and terminal allowed placement points.

[0067] In this embodiment, the central control area preferably includes, but is not limited to, the central control area and the armrest area of ​​the cockpit. In a preferred embodiment, the terminal allowed placement points are marked, or the terminal prohibited placement points are marked, or the terminal allowed placement points and the terminal prohibited placement points are distinguished and marked.

[0068] In this embodiment, the marking method is preferably but not limited to symbols or graphic marks or indicator lights of different colors; different color symbols or graphic marks are used for the allowed terminal placement points and the prohibited terminal placement points, or different color indicator lights are used for marking, so as to facilitate users to observe and place the terminal.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0070] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for performing in-vehicle electromagnetic radiation testing based on an in-vehicle electromagnetic radiation testing system, characterized in that: The antenna module simulating terminal radiation includes a substrate; A radiating microstrip and a feeder connected to the radiating microstrip and a radio frequency signal source are provided on the first surface of the substrate, wherein the radiating microstrip is a closed symmetrical curved structure; A grounding layer is provided on the second surface of the substrate, the first surface and the second surface are opposite to each other, and the grounding layer covers all or part of the feeder on the second surface; The radiation power of the radiation microstrip is adjustable; The output power of the radio frequency signal source connected to the feeder is adjustable; Alternatively, a power regulating unit is connected in series on the feeder; Specifically, one of the following three methods is adopted: Method 1: the output power of the RF signal source is adjustable, and a RF signal source with adjustable output power is selected; Method 2: the output power of the RF signal source is not adjustable, and a power adjustment unit is connected in series on the feeder; Method 3: the output power of the RF signal source is adjustable, and a power adjustment unit is connected in series on the feeder to achieve two-level adjustment; The power regulation unit adopts a radio frequency power amplifier, or a power attenuator, or a radio frequency power amplifier and a power attenuator connected in series; The in-vehicle electromagnetic radiation test system includes a microwave darkroom, a vehicle located in the microwave darkroom, a radio frequency signal source, an antenna module placed inside the vehicle to simulate terminal radiation, and at least one electromagnetic detection unit arranged inside the vehicle; The radio frequency signal source is arranged on the antenna module or is arranged separately from the antenna module, and the output end of the radio frequency signal source is connected to the input end of the feeder; The electromagnetic detection unit detects the magnitude of electromagnetic radiation in the vehicle; A method for performing an in-vehicle electromagnetic radiation test based on the in-vehicle electromagnetic radiation test system includes: Step S1, selecting M antenna position points for placing antenna modules and N radiation test points for arranging electromagnetic detection units in the whole or part of the interior of the vehicle, respectively; wherein M is greater than or equal to 1, and N is greater than or equal to 1; Step S2, placing the antenna modules at M antenna position points in sequence, and after each placement of the antenna module, starting the radio frequency signal source to obtain the radiation values ​​of N radiation test points in a time-sharing or simultaneous manner; Step S3, grouping the N radiation values ​​into a set, and associating the set with the antenna position point where the current antenna module is placed; Step S4, setting a first radiation threshold, and performing the following processing on the M sets in sequence: Determine whether there is a radiation value greater than or equal to a first radiation threshold in the current set, if there is a radiation value greater than or equal to the first radiation threshold, mark the antenna position point associated with the set as a terminal prohibited point, if there is no radiation value greater than or equal to the first radiation threshold, mark the set; Step S5, setting a second radiation threshold, and performing the following processing on all marked sets: calculating the average value of each set, and if the average value is less than or equal to the second radiation threshold, marking the antenna position point associated with the set as a terminal allowed placement point; The second radiation threshold is less than the first radiation threshold.

2. The method for performing in-vehicle electromagnetic radiation testing based on the in-vehicle electromagnetic radiation testing system according to claim 1, characterized in that: When there are multiple electromagnetic detection units, the multiple electromagnetic detection units are located at different positions in the vehicle.

3. The method for performing in-vehicle electromagnetic radiation testing based on the in-vehicle electromagnetic radiation testing system according to claim 1 or 2, characterized in that: The system also includes a plurality of dummies respectively placed in the driver's seat and the passenger seat, and electromagnetic detection units are arranged on different organ parts of the dummies and areas that can be touched by the hands of the driver's seat personnel.

4. The method for performing in-vehicle electromagnetic radiation testing based on the in-vehicle electromagnetic radiation testing system according to claim 1, characterized in that: In the step S1, antenna positions are set at least in the central control area, the seat bottom and the armrest area; And / or radiation test points are provided at least at different organ parts of the dummy and the areas accessible to the driver's hands.

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