CN219105143U - Device and application structure for verifying radiation disturbance measurement system in real time - Google Patents
Device and application structure for verifying radiation disturbance measurement system in real time Download PDFInfo
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- CN219105143U CN219105143U CN202223108976.XU CN202223108976U CN219105143U CN 219105143 U CN219105143 U CN 219105143U CN 202223108976 U CN202223108976 U CN 202223108976U CN 219105143 U CN219105143 U CN 219105143U
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Abstract
The technical scheme of the utility model provides a device for verifying a radiation disturbance measurement system in real time, which is characterized by comprising a signal generating unit; a programmable attenuator; a radio frequency amplifier; a transmitting antenna; a microcontroller; a power supply unit. The utility model further provides an application structure of the device for verifying the radiation disturbance measurement system in real time. Aiming at the problems that the current radiation disturbance measurement system has the risk of error of measurement data, the time consumed for checking the system period is long and the like, the utility model can realize the real-time verification of the radiation disturbance measurement system in the measurement process, and simultaneously avoid the electromagnetic wave reflection of the device and the reference signal for the real-time verification of the radiation disturbance measurement system from interfering the measurement data of the measured equipment, thereby ensuring the accuracy and reliability of the measurement data.
Description
Technical Field
The utility model relates to a device for verifying a radiation disturbance measurement system in real time and application of the device, and belongs to the technical field of electromagnetic compatibility tests.
Background
Radiation disturbance measurement is an important test item in electromagnetic compatibility (EMC) tests, mainly measuring electromagnetic disturbance energy emitted by the Equipment Under Test (EUT) and propagating through space. At present, in order to verify whether the radiation disturbance measurement system is in a normal state, the system needs to be checked during a period, namely, a comb-shaped signal source is used as a standard reference source to be placed in an EUT area, radiation disturbance measurement is executed, and whether the radiation disturbance measurement system meets requirements is judged by comparing whether the measured data of the past is in a range. The period verification of the radiation disturbance measurement system is usually performed daily or weekly, each time requiring about 1 hour.
In the radiation disturbance measurement, different types of measurement receiving antennas need to be exchanged for different frequency bands, but after exchanging the measurement receiving antennas, a great amount of time is not consumed for checking the measurement system in a period, so that if the measurement system is in error such as poor contact of a radio frequency channel interface, channel selection errors, radio frequency cable damage and the like, a larger risk of accuracy of measurement data is caused. In particular, in the measurement of 1 meter semi-anechoic chamber method adopted for automobile parts, military and aerospace products, four measuring antennas are needed to be used, and the four measuring antennas are respectively: 1) monopole antennas are adopted at 150 kHz-30 MHz, 2) biconical antennas are adopted at 30 MHz-300 MHz, 3) logarithmic period antennas are adopted at 300 MHz-1 GHz, and 4) horn antennas are adopted at more than 1 GHz. At the same time, the measurement time of the single frequency band is short (about 15 minutes). Therefore, several tens of times (20 to 40 times) of switching of the measurement receiving antenna or channel are required for continuous measurement every day, which significantly increases the occurrence probability of errors in the measurement system, and poses a serious threat to the accuracy of measurement data.
Disclosure of Invention
The purpose of the utility model is that: the real-time verification of the radiation disturbance measurement system in the measurement process is realized, meanwhile, electromagnetic wave reflection of the device and reference signals for the real-time verification of the radiation disturbance measurement system are prevented from interfering EUT measurement data, and accuracy and reliability of the measurement data are ensured.
In order to achieve the above object, one technical scheme of the present utility model provides a device for verifying a radiation disturbance measurement system in real time, which is characterized by comprising a signal generating unit for generating radio frequency signals of a plurality of frequency points in a radiation disturbance measurement frequency band, wherein an output port of the signal generating unit is connected to an input port of a programmable attenuator for adjusting the amplitude of the radio frequency signals generated by the signal generating unit, an output port of the programmable attenuator is connected to an input port of a radio frequency amplifier for linearly amplifying the radio frequency signals with the amplitude adjusted by the programmable attenuator, and an output port of the radio frequency amplifier is connected to an input port of a transmitting antenna for spatially radiating the radio frequency signals with the amplitude linearly amplified by the radio frequency amplifier;
the control ports of the signal generating unit and the program-controlled attenuator are connected with the microcontroller;
the signal generating unit, the program-controlled attenuator, the radio frequency amplifier and the power supply port of the microcontroller are connected with a power supply unit.
Preferably, the power supply unit includes a rechargeable battery for supplying power to the signal generating unit, the programmable attenuator, the radio frequency amplifier, and the microcontroller, and a power supply switch provided on a power supply circuit between the rechargeable battery and the signal generating unit, the programmable attenuator, the radio frequency amplifier, and the microcontroller.
Preferably, the signal generating unit, the program-controlled attenuator, the radio frequency amplifier, the microcontroller and the power supply unit are all PCB board level circuits composed of active radio frequency chips and components and parts, and are located in a device housing with good shielding performance.
Preferably, the maximum side length of the device housing is not greater than 10cm, in order to avoid that the reflection of electromagnetic waves of the device itself affects the radiation harassment measurement data of EUT.
Preferably, the device housing includes an external power input interface, a communication interface, and a radio frequency output interface;
the external power input interface is used for accessing an external power supply to the power supply unit;
the communication interface is connected to the microcontroller;
the radio frequency output interface is a coaxial radio frequency interface, is internally connected to the output port of the radio frequency amplifier and is externally connected to the transmitting antenna.
Another technical solution of the present utility model is to provide an application structure of the device for verifying a radiation disturbance measurement system in real time, which is characterized by comprising:
the device for verifying the radiation disturbance measuring system in real time is fixedly arranged at the corner inside the anechoic chamber;
and the measuring receiver system is positioned outside the anechoic chamber and is used for measuring the environmental noise inside the anechoic chamber and the radiation emission data of the EUT inside the anechoic chamber through the measuring antenna.
The beneficial technical effects of the utility model are as follows: aiming at the problems that the current radiation disturbance measurement system has the risk of error of measured data, the time consumed for checking the system period is long and the like, a microcontroller is adopted to control a signal generation unit to output radio frequency reference signals of a plurality of frequency points, a program-controlled attenuator is controlled to adjust the amplitude of the reference signals, and the reference signals are linearly amplified by a radio frequency amplifier and then transmitted to a transmitting antenna for space radiation transmission; in the radiation disturbance measurement, each measuring antenna judges whether the radiation disturbance measurement system is in a normal state or not by identifying a reference signal and comparing amplitude values of the reference signal, so that the radiation disturbance measurement system is verified in real time in the measurement process, electromagnetic wave reflection of the device and the EUT measurement data interference by the reference signal for the real-time verification of the radiation disturbance measurement system are avoided, and accuracy and reliability of the measurement data are ensured.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a real-time verification device for a radiation disturbance measurement system according to the present utility model;
FIG. 2 is an example of an application of the present utility model to a real-time verification device for a radiation harassment measurement system.
Detailed Description
The utility model will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present utility model and are not intended to limit the scope of the present utility model. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present utility model, and such equivalents are intended to fall within the scope of the claims appended hereto.
Referring to fig. 1, the device for verifying a radiation disturbance measurement system in real time disclosed in this embodiment includes 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.
The signal generating unit 1 is a PCB board level circuit composed of an active radio frequency chip and components and parts, and is used for generating radio frequency signals of a plurality of frequency points in a radiation disturbance measurement frequency band.
One preferred embodiment is: the signal generating unit 1 generates radio frequency signals of a frequency point on each of four frequency bands of 150 kHz-30 MHz, 30 MHz-300 MHz, 300 MHz-1 GHz and 1 GHz-6 GHz, and the radio frequency signals are used for respectively carrying out system verification on four measuring antenna states corresponding to the four frequency bands.
Another preferred embodiment is: four radio frequency signals in four frequency bands of 150 kHz-30 MHz, 30 MHz-300 MHz, 300 MHz-1 GHz and 1 GHz-6 GHz are used as reference signals, and the four radio frequency signals coexist in the response time of the radiation disturbance measurement system, so that corresponding reference signals can be identified for measurement in any frequency band, and the convenience and stability of operation are improved.
Another preferred embodiment is: for a measurement environment with a single frequency band or other number of frequency bands, the signal generating unit 1 can generate radio frequency signals with only one frequency point or other number of frequency points in the frequency band, and the frequency point number selection principle is to ensure that each measurement antenna can identify one reference signal for measurement system state verification.
The input port of the programmable attenuator 2 is connected to the output port of the signal generating unit 1, and is used for adjusting the amplitude of the radio frequency signal generated by the signal generating unit 1.
One preferred embodiment is: the program-controlled attenuator 2 is adjusted so that the amplitude value of the radio frequency signal received by the radiation disturbance measurement antenna should be at least 3dB higher than the ambient noise at the frequency point and at least 6dB lower than the standard limit value.
One preferred embodiment is: the frequency point selection principle of the reference signal on the corresponding frequency band of each measuring antenna is to select in the area with the largest difference between the environmental noise and the standard limit value.
The input port of the radio frequency amplifier 3 is connected to the output port of the programmable attenuator 2, and is used for linearly amplifying the radio frequency signal with the amplitude adjusted by the programmable attenuator 2.
The input port of the transmitting antenna 4 is connected to the output port of the radio frequency amplifier 3, and is used for performing space radiation transmission on the radio frequency signal linearly amplified by the radio frequency amplifier 3.
The microcontroller 5 is connected to the signal generating unit 1 and the programmable attenuator 2, and is used for controlling the frequency point frequency value and the frequency point number of the radio frequency signal generated by the signal generating unit 1, and simultaneously controlling the programmable attenuator 2 to adjust the amplitude value of the radio frequency signal to a required size.
The power supply unit 6 is connected to the signal generating unit 1, the program controlled attenuator 2, the radio frequency amplifier 3 and the microcontroller 5, and is used for supplying power to each internal module after the external power supply is regulated.
One preferred embodiment is: the power supply unit 6 contains a rechargeable battery for internal power supply of the device disclosed in this embodiment.
Another preferred embodiment is: the power supply unit 6 includes a power supply switch for controlling the on or off state of the device disclosed in this embodiment.
One preferred embodiment is: the device for verifying the radiation disturbance measurement system in real time comprises the signal generating unit 1, the program-controlled attenuator 2, the radio frequency amplifier 3, the microcontroller 5 and the power supply unit 6 which are all PCB-level circuits consisting of active radio frequency chips and components and parts and are located in a device shell with good shielding performance.
One preferred embodiment is: the maximum side length of the device shell is not more than 10cm, so that the radiation disturbance measurement data of EUT is prevented from being influenced by electromagnetic wave reflection of the device.
One preferred embodiment is: the device housing includes an external power input interface, a communication interface, and a radio frequency output interface, wherein:
the external power input interface is used for accessing an external power supply to the power supply unit 6;
the communication interface is connected to the microcontroller 5 and is used for writing control instructions into the microcontroller 5, the communication connection line can be disconnected after the control instructions are written into the microcontroller 5, and the microcontroller 5 stores the control instructions and controls the signal generating unit 1 and the program-controlled attenuator 2;
the rf output interface is a coaxial rf interface, and is internally connected to the output port of the rf amplifier 3, and externally connected to the transmitting antenna 4, so as to transmit the rf signal inside the device housing to the outside, and perform space radiation emission through the transmitting antenna 4.
In an embodiment of the utility model, the use of the device for real-time verification of a radiation disturbance measurement system, see fig. 2, comprises a device 11 for real-time verification of a radiation disturbance measurement system, a device under test (customer premise equipment, EUT) 12, a measurement antenna 13, a group radio frequency coaxial cable 14 and a measurement receiver 15.
The device 11 for verifying the radiation disturbance measurement system in real time is fixedly installed at the corner inside the anechoic chamber, so as to avoid that the reflection of electromagnetic waves of the device itself affects the radiation disturbance measurement data of the EUT 12.
One preferred embodiment is: the installation position of the device 11 for the real-time verification of the radiation disturbance measuring system in the anechoic chamber should lie within the reception lobe of the measuring antenna 13.
The measuring antenna 13 is connected to a measuring receiver 15 outside the anechoic chamber via the radio frequency coaxial cable 14.
The device 11 for verifying the radiation disturbance measuring system in real time is in an on state and emits a reference signal, the measuring receiver 15 system outside the anechoic chamber measures the ambient noise inside the anechoic chamber through the measuring antenna 13 and generates a first set of test data.
The first group of test data comprises environmental noise and a reference signal in the anechoic chamber, and whether the radiation disturbance measurement system is in a normal state is judged by comparing whether the amplitude value of the reference signal is in a required range.
One preferred embodiment is: after checking the field and the system of the whole process once for the anechoic chamber and confirming that the radiation disturbance measuring system is in a normal state, measuring the amplitude value of a group of reference signals by adopting a measuring antenna of each frequency band as a reference value, and prescribing a floating range, such as +/-2 dB of the reference value, according to laboratory requirements on the basis of the reference value.
One preferred embodiment is: for a measurement antenna with polarization direction, the amplitude values of the reference signal under different polarization conditions of horizontal polarization and vertical polarization should be distinguished.
The device 11 for verifying the radiation disturbance measurement system in real time is in a constant opening state, the EUT 12 is opened and is in a typical working state required for radiation disturbance measurement, the measurement receiver 15 system outside the anechoic chamber measures radiation emission data of the EUT 12 inside the anechoic chamber through the measurement antenna 13, and generates a second set of test data.
The second set of test data comprises measurement data of the EUT 12 inside the anechoic chamber and a reference signal, and whether the radiation disturbance measurement system is in a normal state is judged by comparing whether the amplitude value of the reference signal is in a required range.
One preferred embodiment is: when the radiation emission signal of the EUT 12 floods the reference signal, the determination of the first set of test data is in control.
One preferred embodiment is: when the EUT 12 owner mind that the reference signal exists in the EUT measurement data, the device 11 for verifying the radiation disturbance measurement system in real time may be turned off, and the determination result of the first set of test data is determined to be positive.
Claims (6)
1. The device for verifying the radiation disturbance measurement system in real time is characterized by comprising a signal generating unit for generating radio frequency signals of a plurality of frequency points in a radiation disturbance measurement frequency band, wherein an output port of the signal generating unit is connected to an input port of a programmable attenuator for adjusting the amplitude of the radio frequency signals generated by the signal generating unit, an output port of the programmable attenuator is connected to an input port of a radio frequency amplifier for linearly amplifying the radio frequency signals with the amplitude adjusted by the programmable attenuator, and an output port of the radio frequency amplifier is connected to an input port of a transmitting antenna for performing space radiation transmission on the radio frequency signals with the amplitude linearly amplified by the radio frequency amplifier;
the control ports of the signal generating unit and the program-controlled attenuator are connected with the microcontroller;
the signal generating unit, the program-controlled attenuator, the radio frequency amplifier and the power supply port of the microcontroller are connected with a power supply unit.
2. A device for real time verification of a radiation disturbance measurement system according to claim 1, wherein the power supply unit comprises a rechargeable battery for powering the signal generating unit, the programmable attenuator, the radio frequency amplifier and the microcontroller, and a power supply switch provided on a power supply circuit between the rechargeable battery and the signal generating unit, the programmable attenuator, the radio frequency amplifier and the microcontroller.
3. A device for verifying a radiation disturbance measurement system in real time according to claim 1, wherein the signal generating unit, the program controlled attenuator, the radio frequency amplifier, the microcontroller and the power supply unit are all PCB board level circuits composed of active radio frequency chips and components and are located in a device housing with good shielding performance.
4. A device for real time verification of a radiation disturbance measurement system according to claim 3, wherein the maximum side length of the device housing is not more than 10cm.
5. A device for real time verification of a radiation disturbance measurement system according to claim 3, wherein the device housing includes an external power input interface, a communication interface and a radio frequency output interface, wherein:
the external power input interface is used for accessing an external power supply to the power supply unit;
the communication interface is connected to the microcontroller;
the radio frequency output interface is a coaxial radio frequency interface, is internally connected to the output port of the radio frequency amplifier and is externally connected to the transmitting antenna.
6. An application structure of a device for real-time verification of a radiation disturbance measurement system according to claim 1, comprising:
an anechoic chamber, the device for real-time verification of a radiation disturbance measurement system according to claim 1 being fixedly installed at a corner inside the anechoic chamber;
and the measuring receiver system is positioned outside the anechoic chamber and is used for measuring the environmental noise inside the anechoic chamber and the radiation emission data of the EUT inside the anechoic chamber through the measuring antenna.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223108976.XU CN219105143U (en) | 2022-11-22 | 2022-11-22 | Device and application structure for verifying radiation disturbance measurement system in real time |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223108976.XU CN219105143U (en) | 2022-11-22 | 2022-11-22 | Device and application structure for verifying radiation disturbance measurement system in real time |
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| CN219105143U true CN219105143U (en) | 2023-05-30 |
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| CN202223108976.XU Active CN219105143U (en) | 2022-11-22 | 2022-11-22 | Device and application structure for verifying radiation disturbance measurement system in real time |
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