A device and method for real-time validation of a radiated disturbance measurement system

Abstract

The technical scheme of the present application provides a device for real-time verification of a radiation disturbance measurement system, characterized in that the device comprises a signal generation unit, a program-controlled attenuator, a radio frequency amplifier, a transmitting antenna, a microcontroller, and a power supply unit. The other technical scheme of the present application provides a method for real-time verification of a radiation disturbance measurement system. In view of the problems of the current radiation disturbance measurement system, such as the risk of measurement data error and the long time consumption of system periodical check, the present application can realize real-time verification of the radiation disturbance measurement system during the measurement process, and at the same time, avoid the electromagnetic wave reflection of the device itself and the interference of the reference signal for real-time verification of the radiation disturbance measurement system on the measurement data of the measured equipment, so as to ensure the accuracy and reliability of the measurement data.

Description

TECHNICAL FIELD

[0001] The present application relates to a device and method for real-time verification of a radiated disturbance measurement system, and belongs to the technical field of electromagnetic compatibility testing. BACKGROUND

[0002] As an important test item in electromagnetic compatibility (EMC) testing, radiated disturbance measurement mainly measures electromagnetic disturbance energy emitted by an equipment under test (EUT) and propagating through space. At present, in order to verify whether the radiated disturbance measurement system is in a normal state, periodical verification of the system is required, that is, a comb signal source is placed in the EUT area as a standard reference source, and radiated disturbance measurement is performed, and then whether the radiated disturbance measurement system meets the requirements is determined by comparing whether the measurement data of each time is within a range. The periodical verification of the radiated disturbance measurement system is usually performed once a day or once a week, and each time requires about one hour.

[0003] In radiated disturbance measurement, different types of measurement receiving antennas need to be exchanged for different frequency bands, but after the measurement receiving antennas are exchanged, a large amount of time will not be spent on periodical verification of the measurement system. Therefore, if there are measurement system errors such as poor contact of a radio frequency channel interface, channel selection error, and radio frequency cable damage, a great risk of accuracy of measurement data will be caused. Especially in 1-meter method semi-anechoic chamber method measurement of automobile parts, military and aerospace products, four types of measurement antennas are required, which are: 1) a monopole antenna is used at 150 kHz-30 MHz, 2) a biconical antenna is used at 30 MHz-300 MHz, 3) a log-periodic antenna is used at 300 MHz-1 GHz, and 4) a horn antenna is used above 1 GHz. At the same time, the measurement time of a single frequency band is relatively short (about 15 minutes). Therefore, tens of times (20-40 times) of switching of the measurement receiving antennas or channels are required for continuous measurement every day, which significantly increases the probability of occurrence of measurement system errors and seriously threatens the accuracy of measurement data. SUMMARY

[0004] The purpose of the present application is to realize real-time verification of a radiated disturbance measurement system in a measurement process, while avoiding electromagnetic wave reflection of the device itself and reference signal interference with EUT measurement data for real-time verification of the radiated disturbance measurement system, and ensuring the accuracy and reliability of measurement data.

[0005] In order to achieve the above purpose, one technical scheme of the present application provides a device for real-time verification of a radiated disturbance measurement system, characterized by comprising:

[0006] a signal generating unit, configured to generate radio frequency signals of multiple frequency points in a radiated disturbance measurement frequency band;

[0007] a programmable attenuator, an input port of the programmable attenuator being connected to an output port of the signal generating unit, for adjusting the amplitude of the radio frequency signal generated by the signal generating unit;

[0008] a radio frequency amplifier, an input port of the radio frequency amplifier being connected to an output port of the programmable attenuator, for linearly amplifying the radio frequency signal whose amplitude has been adjusted by the programmable attenuator;

[0009] a transmitting antenna, an input port of the transmitting antenna being connected to an output port of the radio frequency amplifier, for spatially radiating and transmitting the radio frequency signal linearly amplified by the radio frequency amplifier;

[0010] a microcontroller, the microcontroller being connected to the signal generating unit and the programmable attenuator, for controlling the signal generating unit to generate radio frequency signals with a frequency value and a number of frequency points, and for controlling the programmable attenuator to adjust the amplitude of the radio frequency signal to a desired value;

[0011] a power supply unit, the power supply unit being connected to the signal generating unit, the programmable attenuator, the radio frequency amplifier and the microcontroller, for supplying power to the signal generating unit, the programmable attenuator, the radio frequency amplifier and the microcontroller after the external power supply is regulated and stabilized.

[0012] Preferably, the signal generating unit generates one frequency point of radio frequency signal in each of the four frequency bands of 150 kHz-30 MHz, 30 MHz-300 MHz, 300 MHz-1 GHz and 1 GHz-6 GHz, for respectively verifying the system state of the four measurement antennas corresponding to the four frequency bands.

[0013] The four radio frequency signals in the four frequency bands of 150 kHz-30 MHz, 30 MHz-300 MHz, 300 MHz-1 GHz and 1 GHz-6 GHz are simultaneously present as reference signals within the response time of the radiation disturbance measurement system, so that the corresponding reference signal can be identified for any frequency band measurement, improving the convenience and stability of operation.

[0014] Preferably, for a measurement environment of a single frequency band or other number of frequency bands except the four frequency bands of 150 kHz-30 MHz, 30 MHz-300 MHz, 300 MHz-1 GHz and 1 GHz-6 GHz, the signal generating unit can generate one or other number of frequency points of radio frequency signal in the current frequency band, and the number of frequency points is selected to ensure that each measurement antenna can identify one reference signal for verifying the state of the radiation disturbance measurement system.

[0015] Preferably, the amplitude value of the radio frequency signal received by the radiated disturbance measuring antenna is adjusted by the programmable attenuator to be at least 3dB higher than the ambient noise and at least 6dB lower than the standard limit value at the frequency point;

[0016] The frequency point of the reference signal corresponding to each measuring antenna is selected in the area where the difference between the ambient noise and the standard limit value is the largest.

[0017] Preferably, the power supply unit comprises:

[0018] A rechargeable battery for internal power supply of the device;

[0019] A power supply switch for controlling the on or off state of the device.

[0020] Preferably, the signal generating unit, the programmable attenuator, the radio frequency amplifier, the microcontroller and the power supply unit are PCB board level circuits composed of active radio frequency chips and components, and are located in a device housing with good shielding performance, and the maximum side length of the device housing is not greater than 10cm, so as to avoid the influence of electromagnetic wave reflection of the device itself on the radiated disturbance measurement data of the EUT.

[0021] Preferably, the device housing comprises an external power input interface, a communication interface and a radio frequency output interface;

[0022] The external power input interface is used to access external power for the power supply unit;

[0023] The communication interface is connected to the microcontroller for writing control instructions to the microcontroller, and the communication connection line is disconnected after the control instructions are written to the microcontroller, and the microcontroller stores the control instructions and controls the signal generating unit and the programmable attenuator;

[0024] The radio frequency output interface is a coaxial radio frequency interface, which is connected to the output port of the radio frequency amplifier inside and connected to the transmitting antenna outside, and is used to transmit the radio frequency signal inside the device housing to the outside and radiate and emit in space through the transmitting antenna.

[0025] Another technical scheme of the present application provides a method for real-time verification of a radiated disturbance measuring system, which applies the device for real-time verification of a radiated disturbance measuring system, and comprises:

[0026] The device for real-time verification of a radiated disturbance measuring system is fixedly installed in a corner inside the anechoic chamber, so as to avoid the influence of electromagnetic wave reflection of the device itself on the radiated disturbance measurement data of the EUT;

[0027] The device for real-time verification of the radiated disturbance measurement system is in an open state and emits a reference signal, and a measurement receiver system outside the anechoic chamber measures the ambient noise inside the anechoic chamber through a measurement antenna and generates a first set of test data, wherein the first set of test data contains the ambient noise inside the anechoic chamber and the reference signal, and whether the radiated disturbance measurement system is in a normal state is determined by comparing whether the amplitude value of the reference signal is within a required range.

[0028] The device for real-time verification of the radiated disturbance measurement system is in an open state and emits a reference signal, and a measurement receiver system outside the anechoic chamber measures the ambient noise inside the anechoic chamber through a measurement antenna and generates a first set of test data, wherein the first set of test data contains the ambient noise inside the anechoic chamber and the reference signal, and whether the radiated disturbance measurement system is in a normal state is determined by comparing whether the amplitude value of the reference signal is within a required range.

[0029] Preferably, the installation position of the device for real-time verification of the radiated disturbance measurement system inside the anechoic chamber should be within the receiving lobe range of the radiated disturbance measurement antenna.

[0030] Preferably, after the radiated disturbance measurement system is confirmed to be in a normal state through a one-time full-process site and system verification of the anechoic chamber, the amplitude value of a set of reference signals measured by each frequency band measurement antenna is used as a reference value, and a floating range is specified based on the reference value according to laboratory requirements, for example, ±2 dB of the reference value.

[0031] For measurement antennas with polarization directions, the amplitude values of the reference signals under different polarization conditions should be distinguished between horizontal polarization and vertical polarization.

[0032] Preferably, when the radiated emission signal of the EUT overwhelms the reference signal, the determination result of the first set of test data is used as a reference.

[0033] When the EUT owner is concerned about the existence of the reference signal in the EUT measurement data, the device for real-time verification of the radiated disturbance measurement system can be turned off, and in this case, the determination result of the first set of test data is used as a reference.

[0034] The beneficial technical effect of the present application is: in view of the problems of the current radiation disturbance measurement system, such as the risk of measurement data error and the long time consumption of system period checking, a microcontroller is used to control the signal generating unit to output multiple frequency point radio frequency reference signals, and to control the programmable attenuator to adjust the amplitude of the reference signal, and after the reference signal is linearly amplified by the radio frequency amplifier, it is transmitted to the transmitting antenna for spatial radiation emission; in the radiation disturbance measurement, each measurement antenna determines whether the radiation disturbance measurement system is in a normal state by identifying the reference signal and comparing the amplitude value of the reference signal, so as to realize real-time verification of the radiation disturbance measurement system during the measurement process, and at the same time, avoid the electromagnetic wave reflection of the device itself and the reference signal interference EUT measurement data for real-time verification of the radiation disturbance measurement system, and ensure the accuracy and reliability of the measurement data. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a structural schematic diagram of an embodiment of a real-time verification device for a radiation disturbance measurement system of the present application;

[0036] Figure 2 is an application example of a real-time verification device for a radiation disturbance measurement system of the present application. DETAILED DESCRIPTION

[0037] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. In addition, it should be understood that after reading the content taught by the present application, those skilled in the art can make various modifications or changes to the present application, and these equivalent forms also fall within the scope of the appended claims of the present application.

[0038] Reference Figure 1 The present embodiment discloses a device for real-time verification of a radiation disturbance measurement system, which comprises a signal generating unit 1, a programmable attenuator 2, a radio frequency amplifier 3, a transmitting antenna 4, a microcontroller 5 and a power supply unit 6.

[0039] The signal generating unit 1 is a PCB board level circuit composed of active radio frequency chips and components, which is used to generate multiple frequency point radio frequency signals in the radiation disturbance measurement frequency band.

[0040] A preferred embodiment is that the signal generating unit 1 generates one frequency point radio frequency signal in each of the four frequency bands of 150kHz-30MHz, 30MHz-300MHz, 300MHz-1GHz and 1GHz-6GHz, which is used to verify the state of the four measurement antennas corresponding to the four frequency bands respectively.

[0041] Another preferred embodiment is that four reference signals of four frequency bands of 150 kHz-30 MHz, 30 MHz-300 MHz, 300 MHz-1 GHz and 1 GHz-6 GHz are simultaneously present within the response time of the radiation disturbance measurement system, so that the corresponding reference signal can be identified for any frequency band measurement, improving the convenience and stability of operation.

[0042] Another preferred embodiment is that the signal generating unit 1 can generate one or other number of frequency points of radio frequency signals within the frequency band for a single or other number of frequency band measurement environment, and the number of frequency points is selected to ensure that each measurement antenna can identify one reference signal for measurement system state verification.

[0043] The input port of the programmable attenuator 2 is connected to the output port of the signal generating unit 1, which is used to adjust the amplitude of the radio frequency signal generated by the signal generating unit 1.

[0044] A preferred embodiment is that the programmable attenuator 2 is adjusted so that the amplitude value of the radio frequency signal received by the radiation disturbance measurement antenna is at least 3 dB higher than the environmental noise at the frequency point and at least 6 dB lower than the standard limit value.

[0045] A preferred embodiment is that the frequency point selection principle of the reference signal corresponding to each measurement antenna in the frequency band is to select the area with the largest difference between the environmental noise and the standard limit value.

[0046] The input port of the radio frequency amplifier 3 is connected to the output port of the programmable attenuator 2, which is used to linearly amplify the radio frequency signal whose amplitude has been adjusted by the programmable attenuator 2.

[0047] The input port of the transmitting antenna 4 is connected to the output port of the radio frequency amplifier 3, which is used to spatially radiate and transmit the radio frequency signal linearly amplified by the radio frequency amplifier 3.

[0048] The microcontroller 5 is connected to the signal generating unit 1 and the programmable attenuator 2, which is used to control the frequency value and number of frequency points of the radio frequency signal generated by the signal generating unit 1, and to control the programmable attenuator 2 to adjust the amplitude value of the radio frequency signal to the desired size.

[0049] The power supply unit 6 is connected to the signal generating unit 1, the programmable attenuator 2, the radio frequency amplifier 3 and the microcontroller 5, which is used to supply power to the internal modules after the external power supply is regulated and stabilized.

[0050] A preferred embodiment is that the power supply unit 6 includes a rechargeable battery, which is used for internal power supply of the device disclosed in the embodiment.

[0051] Another preferred embodiment is that the power supply unit 6 includes a power supply switch for controlling the on or off state of the device disclosed in this embodiment.

[0052] A preferred embodiment is that the device for real-time verification of the radiated disturbance measurement system includes a signal generation unit 1, a programmable attenuator 2, an RF amplifier 3, a microcontroller 5, and a power supply unit 6, all of which are PCB-level circuits composed of active RF chips and components, and are all housed within a well-shielded device housing.

[0053] A preferred implementation is that the maximum side length of the device housing is no more than 10cm, so as to avoid the electromagnetic wave reflection of the device itself affecting the radiated disturbance measurement data of the EUT.

[0054] A preferred embodiment is that the device housing includes an external power input interface, a communication interface, and a radio frequency output interface, wherein:

[0055] The external power input interface is used to connect an external power source to the power supply unit 6;

[0056] The communication interface is connected to the microcontroller 5 and is used to write control instructions to the microcontroller 5. After the control instructions are written to the microcontroller 5, the communication connection can be disconnected. The microcontroller 5 stores the control instructions and controls the signal generation unit 1 and the programmable attenuator 2.

[0057] The radio frequency output interface is a coaxial radio frequency interface, which is internally connected to the output port of the radio frequency amplifier 3 and externally connected to the transmitting antenna 4. It is used to transmit the radio frequency signal inside the device housing to the outside and to perform spatial radiation transmission through the transmitting antenna 4.

[0058] In one embodiment of the present invention, the application of the apparatus for real-time verification of a radiated disturbance measurement system is described in [reference needed]. Figure 2 It includes a device 11 for real-time verification of the radiated disturbance measurement system, a device under test (EUT) 12, a measurement antenna 13, a set of radio frequency coaxial cables 14, and a measurement receiver 15.

[0059] The device 11 for real-time verification of the radiated disturbance measurement system is fixedly installed in a corner inside the anechoic chamber to avoid the electromagnetic wave reflection of the device itself affecting the radiated disturbance measurement data of the EUT 12.

[0060] A preferred embodiment is that the device 11 for real-time verification of the radiated disturbance measurement system should be installed in an anechoic chamber within the receiving beam range of the measurement antenna 13.

[0061] The measurement antenna 13 is connected to the measurement receiver 15 outside the anechoic chamber via the radio frequency coaxial cable 14.

[0062] The device 11 for real-time verification of the radiated disturbance measurement system is turned on and transmits a reference signal. The measurement receiver 15 system located outside the anechoic chamber measures the ambient noise inside the anechoic chamber through the measurement antenna 13 and generates the first set of test data.

[0063] The first set of test data includes the ambient noise inside the anechoic chamber and a reference signal. The radiated disturbance measurement system is judged to be in normal condition by comparing whether the amplitude value of the reference signal is within the required range.

[0064] A preferred implementation method is to conduct a full-process site and system check of the anechoic chamber to confirm that the radiated disturbance measurement system is in normal condition. Then, use the measurement antennas of each frequency band to measure the amplitude values ​​of a set of reference signals as reference values. Based on the reference values, the fluctuation range is specified according to the laboratory requirements, such as ±2dB of the reference values.

[0065] A preferred implementation is that, for a measurement antenna with polarization direction, the amplitude values ​​of the reference signal under different polarization conditions, namely horizontal polarization and vertical polarization, should be distinguished.

[0066] The device 11 for real-time verification of the radiated emission measurement system remains in the on state. The EUT 12 is turned on and is in the typical working state required for radiated emission measurement. The measurement receiver 15 system located outside the anechoic chamber measures the radiated emission data of the EUT 12 inside the anechoic chamber through the measurement antenna 13 and generates a second set of test data.

[0067] The second set of test data includes the measurement data and reference signal of the EUT 12 inside the anechoic chamber. The radiated disturbance measurement system is in normal condition by comparing whether the amplitude value of the reference signal is within the required range.

[0068] A preferred implementation is that when the radiated emission signal of the EUT 12 overwhelms the reference signal, the determination result of the first set of test data shall prevail.

[0069] A preferred implementation is that when the owner of the EUT 12 is concerned about the presence of a reference signal in the EUT measurement data, the device 11 used for real-time verification of the radiated disturbance measurement system can be turned off, and the judgment result of the first set of test data shall prevail.

Claims

1. A method for real-time verification of a radiated emission measurement system, comprising an apparatus for real-time verification of the radiated emission measurement system, the apparatus comprising: A signal generation unit is used to generate radio frequency signals at multiple frequency points within the radiated disturbance measurement band; A programmable attenuator, the input port of which is connected to the output port of the signal generation unit, is used to adjust the amplitude of the radio frequency signal generated by the signal generation unit; an radio frequency amplifier, the input port of which is connected to the output port of the programmable attenuator, is used to linearly amplify the radio frequency signal after the amplitude has been adjusted by the programmable attenuator. A transmitting antenna, the input port of which is connected to the output port of the radio frequency amplifier, is used to radiate the radio frequency signal after linear amplification by the radio frequency amplifier into space; a microcontroller is connected to the signal generation unit and the programmable attenuator, and is used to control the frequency value and number of frequency points of the radio frequency signal generated by the signal generation unit, and at the same time control the programmable attenuator to adjust the amplitude value of the radio frequency signal to the required size. A power supply unit, connected to the signal generation unit, the programmable attenuator, the RF amplifier, and the microcontroller, is used to regulate and power the signal generation unit, the programmable attenuator, the RF amplifier, and the microcontroller after adjusting the voltage of an external power supply. The method comprises the following steps: fixing the device for real-time verification of the radiated emissions measurement system in a corner inside an anechoic chamber to avoid electromagnetic wave reflection from the device itself affecting the radiated emissions measurement data of the EUT; the device for real-time verification of the radiated emissions measurement system is in an on state and transmits a reference signal; a measurement receiver system located outside the anechoic chamber measures the environmental noise inside the anechoic chamber through a measurement antenna and generates a first... The test data consists of two sets. The first set includes ambient noise and a reference signal inside the anechoic chamber. The amplitude of the reference signal is compared to determine whether the radiated emission measurement system is functioning correctly. The device for real-time verification of the radiated emission measurement system remains powered on, and the EUT is powered on and in its typical operating state required for radiated emission measurement. The measurement receiver system located outside the anechoic chamber measures the radiated emission data of the EUT inside the anechoic chamber through a measurement antenna and generates a second set of test data. This second set includes the EUT measurement data inside the anechoic chamber and a reference signal. The amplitude of the reference signal is compared to determine whether the radiated emission measurement system is functioning correctly.

2. The method for real-time verification of a radiated disturbance measurement system as described in claim 1, characterized in that, The signal generation unit generates a radio frequency signal at a frequency point in each of the four frequency bands: 150 kHz to 30 MHz, 30 MHz to 300 MHz, 300 MHz to 1 GHz, and 1 GHz to 6 GHz. These signals are used to verify the status of the four measurement antennas corresponding to the four frequency bands. The four radio frequency signals in the four frequency bands serve as reference signals and exist simultaneously within the response time of the radiated disturbance measurement system. This ensures that the corresponding reference signal can be identified for any frequency band measurement, improving the convenience and stability of operation.

3. A method for real-time verification of a radiated disturbance measurement system as described in claim 2, characterized in that, For measurement environments involving a single frequency band or other frequency bands besides the four bands of 150 kHz to 30 MHz, 30 MHz to 300 MHz, 300 MHz to 1 GHz, and 1 GHz to 6 GHz, the signal generation unit can generate only one or more radio frequency signals within the current frequency band. The principle for selecting the number of frequency points is to ensure that each measurement antenna can identify a reference signal for radiated disturbance measurement system status verification.

4. A method for real-time verification of a radiated disturbance measurement system as described in claim 1, characterized in that, The programmable attenuator is adjusted so that the amplitude of the radio frequency signal received by the radiated disturbance measurement antenna is at least 3 dB higher than the ambient noise at the corresponding frequency and at least 6 dB lower than the standard limit. The frequency point of the reference signal in the corresponding frequency band of each measurement antenna is selected in the area where the difference between the ambient noise and the standard limit is the largest.

5. A method for real-time verification of a radiated disturbance measurement system as described in claim 1, characterized in that, The signal generation unit, the programmable attenuator, the RF amplifier, the microcontroller, and the power supply unit are all PCB-level circuits composed of active RF chips and components, and are all housed in a well-shielded device housing. The maximum side length of the device housing is no more than 10 cm.

6. The method for real-time verification of a radiated disturbance measurement system as described in claim 5, characterized in that, The device housing includes an external power input interface, a communication interface, and a radio frequency (RF) output interface. The external power input interface is used to connect an external power source to the power supply unit. The communication interface is connected to the microcontroller and is used to write control commands to the microcontroller. After the control commands are written to the microcontroller, the communication connection can be disconnected. The microcontroller stores the control commands and controls the signal generation unit and the programmable attenuator. The RF output interface is a coaxial RF interface, internally connected to the output port of the RF amplifier and externally connected to the transmitting antenna, used to transmit the RF signals inside the device housing to the outside and radiate them into space through the transmitting antenna.

7. The method for real-time verification of a radiated disturbance measurement system as described in claim 1, characterized in that, The device used for real-time verification of the radiated disturbance measurement system should be installed inside the anechoic chamber within the receiving beam range of the radiated disturbance measurement antenna.

8. The method for real-time verification of a radiated disturbance measurement system as described in claim 1, characterized in that, A full site and system check of the anechoic chamber should be conducted to confirm that the radiated interference measurement system is in normal condition. Then, the amplitude values ​​of a set of reference signals should be measured using the measurement antennas of each frequency band as reference values. Based on the reference values, the fluctuation range should be specified according to the laboratory requirements. For measurement antennas with polarization direction, the amplitude values ​​of reference signals under different polarization conditions, such as horizontal polarization and vertical polarization, should be distinguished.

9. The method for real-time verification of a radiated disturbance measurement system as described in claim 1, characterized in that: When the radiated emission signal of the EUT overwhelms the reference signal, the judgment result of the first set of test data shall prevail; when the EUT owner is concerned about the presence of a reference signal in the EUT measurement data, the device used for real-time verification of the radiated disturbance measurement system can be turned off, and the judgment result of the first set of test data shall prevail.

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