CN102645591B - Shielding efficiency monitoring system and monitoring method thereof - Google Patents
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Abstract
The invention provides a shielding efficiency monitoring system, which comprises a central controller, a radiofrequency module, a user interface, a power management module and an antenna. The invention further provides a shielding efficiency monitoring method applied to the shielding efficiency monitoring system. By the aid of the shielding efficiency monitoring system and the shielding efficiency monitoring method with the design, cost can be reduced, portability of the system is improved, and operation is simplified.
Description
Technical Field
The invention relates to the field of electromagnetic compatibility monitoring, in particular to a shielding effectiveness monitoring system and a monitoring method thereof.
Background
The signal source of the existing shielding effectiveness monitoring system is a dot frequency (single frequency point) signal source. The shielding performance is determined by the difference of the electromagnetic field intensity of the shielding body and the electromagnetic field intensity of the shielding body through the frequency spectrograph or the measuring receiver through the antenna.
The existing shielding effectiveness test system adopts a spectrum analyzer or a measuring receiver to measure the signal intensity, and is expensive.
From the measurement principle, in order to measure higher shielding effectiveness, that is, to increase the dynamic range of the monitoring system, the monitoring system may increase the output power of the power signal source, and may also increase the receiving sensitivity of the device. Both of these approaches are not very economical, however, often resulting in a doubling of the system equipment cost due to the increased dynamic range of tens of dB. The design of power amplifiers and low noise amplifiers can be challenging when designing system devices.
The system of the invention adopts a radio frequency communication circuit to transmit and receive data, and obtains the signal intensity before and after the existence of the shielding body through the communication circuit or obtains the shielding effect value of the shielding body through adjusting the circuit loss through an attenuator and comparing the circuit loss with the standard.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a shielding effectiveness monitoring system, which can reduce the cost, improve the portability of the system and simplify the operation.
The technical scheme of the invention is as follows:
a shielding effectiveness monitoring system, comprising: the system comprises a central controller, a radio frequency module, a user interface, a power management module and an antenna; the central controller is used for coordinating the normal working operation of the radio frequency module, the display module, the user interface, the remote communication module, the power management module and the antenna; in a receiving mode, the central controller is configured to receive digital data sent by the radio frequency module, analyze and process the digital data, obtain a shielding effectiveness through a signal strength difference value when a shield is present or absent or a path loss difference value when a shield is present or absent, and send an operating state of the shielding effectiveness monitoring system and the shielding effectiveness to the display module; or, in the transmitting mode, the central controller is configured to receive a user instruction transmitted by the user interface, and the central controller converts the user instruction into a transmitting command and sends the transmitting command to the radio frequency module; the radio frequency module is used for receiving a radio frequency input signal sent by the antenna, amplifying and demodulating the radio frequency input signal, converting the radio frequency input signal into the digital data and sending the digital data to the central controller for processing; or, the radio frequency module is configured to receive a transmission command sent by the central controller, modulate the transmission command, generate a transmission frequency output signal, and send the transmission frequency output signal to the antenna; the digital data comprises electric field strength, magnetic field strength, voltage, power and path loss values of the radio frequency input signal; a user interface for inputting the user instruction and transmitting the user instruction to the central controller; the power management module is used for power supply management and monitoring of the shielding effectiveness monitoring system and sending monitoring data to the central controller; the antenna is used for receiving the radio frequency input signal transmitted by the monitoring frequency point and transmitting the radio frequency input signal to the radio frequency module; alternatively, the antenna is for transmitting the frequency output signal.
Further: the shielding effectiveness monitoring system comprises a display module, wherein the display module is used for receiving the data processed by the central controller and displaying the running state and the shielding effectiveness of the shielding effectiveness monitoring system.
Further: the shielding effectiveness monitoring system comprises the remote communication module, and the remote communication module is used for realizing remote communication.
Further: the radio frequency module comprises an antenna interface, an input/output matching circuit and a transceiver; the transceiver comprises a receiver and a generator; the receiver comprises an attenuator, a low noise amplifier, a mixer, an intermediate frequency amplifier, a demodulator and a decoder; the generator comprises a power amplifier and a frequency synthesizer; the frequency synthesizer comprises a crystal oscillator, a phase detector, a charge pump, a voltage-controlled oscillator and a frequency divider; the attenuator is used for adjusting the intensity of the radio frequency input signal and transmitting the radio frequency input signal to the low noise amplifier; for adjusting the strength of the frequency output signal for transmission to the antenna; a low noise amplifier for amplifying the radio frequency input signal for transmission to the mixer; the mixer is used for converting the amplified radio frequency input signal and the amplified local oscillator signal into an intermediate frequency signal and transmitting the intermediate frequency signal to the intermediate frequency amplifier; an intermediate frequency amplifier for amplifying and filtering the intermediate frequency signal and transmitting the amplified and filtered intermediate frequency signal to the demodulator; a demodulator for converting the amplified and filtered intermediate frequency signal into the digital data and transmitting the digital data to the central controller; a decoder for receiving the transmit command from the central controller, transforming the transmit command into the frequency output signal, and transmitting to the power amplifier; the frequency synthesizer is used for generating the local oscillation signal and transmitting the local oscillation signal to the frequency mixer or the power amplifier; and the power amplifier is used for amplifying the frequency output signal and the local oscillation signal and outputting the amplified signals to the attenuator or the antenna.
Further: the transmitting and receiving frequency of the radio frequency module selects a frequency point between 400MHz and 6GHz as a monitoring frequency point.
Another technical problem to be solved by the present invention is to provide a shielding effectiveness monitoring method, which is applied to the shielding effectiveness monitoring system.
The technical scheme of the invention is as follows:
a shielding effectiveness monitoring method, comprising: the central controller coordinates the normal working operation of the radio frequency module, the display module, the user interface, the remote communication module, the power management module and the antenna; in a receiving mode, the central controller receives digital data sent by the radio frequency module, analyzes and processes the digital data, obtains shielding effectiveness through a signal strength difference value when a shield exists or a path loss difference value when the shield exists or does not exist, and sends the running state of the shielding effectiveness monitoring system and the shielding effectiveness to the display module; or, in a transmitting mode, the central controller receives a user instruction transmitted by the user interface, and the central controller converts the user instruction into a transmitting command and sends the transmitting command to the radio frequency module; the radio frequency module receives a radio frequency input signal sent by the antenna, amplifies and demodulates the radio frequency input signal, converts the radio frequency input signal into digital data and sends the digital data to the central controller for processing; or, the radio frequency module receives a transmission command sent by the central controller, modulates the transmission command to generate a transmission frequency output signal and sends the transmission frequency output signal to the antenna; the digital data comprises electric field strength, magnetic field strength, voltage, power and path loss values of the radio frequency input signal; a user interface receives the user instruction and transmits the user instruction to the central controller; the power management module is used for power supply management and monitoring of the shielding effectiveness monitoring system and sending monitoring data to the central controller; the antenna receives the radio frequency input signal transmitted by the monitoring frequency point and transmits the radio frequency input signal to the radio frequency module; or, when the monitoring frequency point is transmitted, the antenna transmits the frequency output signal.
Further: and the display module receives the data processed by the central controller and displays the running state and the shielding effectiveness of the shielding effectiveness monitoring system.
Further: inputting the user instruction through the remote communication module.
Further: the radio frequency module comprises an antenna interface, an input/output matching circuit and a transceiver; the transceiver comprises a receiver and a generator; the receiver comprises an attenuator, a low noise amplifier, a mixer, an intermediate frequency amplifier, a demodulator and a decoder; the generator comprises a power amplifier and a frequency synthesizer; the frequency synthesizer comprises a crystal oscillator, a phase detector, a charge pump, a voltage-controlled oscillator and a frequency divider; wherein, the attenuator adjusts the intensity of the radio frequency input signal and transmits the radio frequency input signal to the low noise amplifier; adjusting the strength of the frequency output signal and transmitting the frequency output signal to the antenna; the low-noise amplifier amplifies the radio frequency input signal and transmits the radio frequency input signal to the mixer; the mixer converts the amplified radio frequency input signal and the local oscillator signal into an intermediate frequency signal and transmits the intermediate frequency signal to the intermediate frequency amplifier; the intermediate frequency amplifier amplifies and filters the intermediate frequency signal and transmits the amplified and filtered intermediate frequency signal to the demodulator; the demodulator converts the amplified and filtered intermediate frequency signal into digital data and transmits the digital data to the central controller; a decoder receives the transmit command from the central controller, transforms the transmit command into the frequency output signal, and transmits the frequency output signal to the power amplifier; the frequency synthesizer generates the local oscillation signal and transmits the local oscillation signal to the mixer or the power amplifier; the power amplifier amplifies the frequency output signal and the local oscillation signal and outputs the amplified signals to the attenuator or the antenna;
further: the transmitting and receiving frequency of the radio frequency module selects a frequency point between 400MHz and 6GHz as a monitoring frequency point.
The invention has the following technical effects:
1. through the design of the invention, the cost can be reduced, the portability of the system can be improved and the operation can be simplified;
2. the invention can be placed in a shield body or outside the shield body, and has the characteristic of strong anti-interference capability.
Drawings
FIG. 1 is a block diagram of a shielding effectiveness monitoring system of the present invention;
FIG. 2 is a schematic diagram of the RF module of the present invention;
fig. 3 is a flow chart of the shielding effectiveness monitoring method of the present invention.
Detailed Description
The following describes a specific embodiment of the present invention with reference to examples.
Fig. 1 is a block diagram of a shielding effectiveness monitoring system according to the present invention. The shielding effectiveness monitoring system of the present invention integrally includes: a central controller 101, a radio frequency module 102, a display module 103, a user interface 104, a remote communication module 105, a power management module 106, and an antenna 107.
The central controller 101 is used for coordinating the normal operation of the radio frequency module 102, the display module 103, the user interface 104, the remote communication module 105, the power management module 106 and the antenna 107; in a receiving mode, the central controller 101 receives digital data sent by the radio frequency module 102, analyzes and processes the digital data, obtains shielding effectiveness through a signal strength difference value when a shield exists or a path loss difference value when the shield exists, and sends an operating state of the shielding effectiveness monitoring system and the shielding effectiveness to the display module 103; in the transmitting mode, the central controller 101 receives a user command transmitted by the user interface, and the central controller 101 converts the user command into a transmitting command and sends the transmitting command to the rf module 102.
A radio frequency module 102, configured to receive a radio frequency input signal sent by an antenna 107, amplify and demodulate the radio frequency input signal, convert the radio frequency input signal into digital data, and send the digital data to the central controller 101 for processing, where the digital data includes an electric field strength, a magnetic field strength, a voltage, a power, and a path loss value of the radio frequency input signal; the rf module 102 is configured to receive a transmission command sent by the central controller 101, modulate the transmission command to generate a radio frequency output signal, where the radio frequency output signal is a modulated signal with data and a certain bandwidth, and the radio frequency output signal is sent to the antenna 107 to be transmitted.
Fig. 2 is a schematic diagram of the rf module of the present invention.
The rf module 102 includes an antenna interface, an input/output matching circuit, and a transceiver; the transceiver comprises a receiver and a generator; the receiver includes an attenuator 1028, a low noise amplifier 1021, a mixer 1022, an intermediate frequency amplifier 1023, a demodulator 1024, and a decoder 1025; the generator includes a power amplifier 1027 and a frequency synthesizer 1026; the frequency synthesizer 1026 includes a crystal oscillator, a phase detector, a charge pump, a voltage controlled oscillator, and a frequency divider. An attenuator 1028 for adjusting the intensity of the rf input signal to the lna 1021; for adjusting the strength of the frequency output signal for transmission to the antenna 107; a low noise amplifier 1021 for amplifying the rf input signal to be transmitted to the mixer 1022; a mixer 1022, configured to convert the amplified rf input signal and the local oscillator signal into an intermediate frequency signal, and transmit the intermediate frequency signal to an intermediate frequency amplifier 1023; an intermediate frequency amplifier 1023 for amplifying and filtering the intermediate frequency signal, which is transmitted to a demodulator 1024; a demodulator 1024 for converting the amplified and filtered intermediate frequency signal into digital data and transmitting the digital data to the central controller 101; a decoder 1025 for receiving the transmission command from the central controller 101, converting the transmission command into a frequency output signal, and transmitting the frequency output signal to the power amplifier 1027; a frequency synthesizer 1026 for generating a local oscillator signal for transmission to the mixer 1022 or the power amplifier 1027; the power amplifier 1027 amplifies the frequency output signal and the local oscillation signal, and outputs the amplified signals to the attenuator 1028 or the antenna 107.
The operation principle of the rf module 102 is as follows:
when the shielding effectiveness monitoring system is in a receiving mode, the radio frequency input signal amplified by the low noise amplifier 1021 and the local oscillator signal generated by the frequency synthesizer 1026 are sent to the mixer 1022, the amplified radio frequency input signal and the local oscillator signal are converted into an intermediate frequency signal by the mixer 1022, the intermediate frequency signal is amplified and filtered by the intermediate frequency amplifier 1023 and then sent to the demodulator 1024 to be converted into digital data, and the digital data is sent to the central controller 101;
when the shielding effectiveness monitoring system is in a transmission mode, the decoder 1025 receives a transmission command from the central controller 101, converts the transmission command into a frequency output signal, sends the frequency output signal and a local oscillation signal generated by the frequency synthesizer 1026 to the power amplifier 1027, and then outputs the frequency output signal and the local oscillation signal to the attenuator 1028 or the antenna 107;
when the rf input signal or the frequency output signal cannot meet the monitoring requirement, the attenuator 1028 may also adjust the intensity of the rf input signal or the frequency output signal to meet the monitoring requirement.
The display module 103 receives the digital data processed by the central controller 101, and displays the operation state and the shielding effectiveness of the shielding effectiveness monitoring system.
The user interface 104 receives a user instruction and transmits the user instruction to the central controller 101, thereby controlling the operation state of the shielding effectiveness monitoring system.
The remote communication module 105 is used to implement remote communication, and a user can input a user instruction using the remote communication module 105.
The power management module 106 is used for power management and monitoring, and sends monitoring data to the central controller 101.
The antenna 107 is configured to receive a radio frequency input signal transmitted by the monitoring frequency point, and send the radio frequency input signal to the radio frequency module 102; at the transmit monitoring frequency point, the antenna 107 is used to transmit the frequency output signal.
The transmitting and receiving frequency of the radio frequency module selected by the invention selects a frequency point between 400MHz and 6GHz as a monitoring frequency point.
In addition, the frequency output signal sent by the shielding effectiveness monitoring system is a modulation signal with data and a certain bandwidth, and the shielding effectiveness is obtained by measuring the signal intensity difference of the received modulation signal or is calculated by the corresponding path loss difference after the receiving end is demodulated, decoded and correctly received.
Fig. 3 is a flow chart of the shielding effectiveness monitoring method of the present invention. In the preferred embodiment, the frequency points of 433MHz and 915MHz are selected as the monitoring frequency points of the shielding effectiveness monitoring system.
The estimation formula of the hole electromagnetic leakage is as follows:
SE＝100－20lg(L)－20lg(f)+20lg(1+2.3lg(L/H))
l ═ the length of the gap (mm);
h-the width of the gap (mm);
f is the frequency (MHz) of the incident electromagnetic wave.
It can be seen from the above estimation formula that if the shielding effectiveness of the frequency points of 433MHz and 915MHz can meet the requirement of monitoring the shielding effectiveness, the monitoring below the two frequency points also meets the requirement. For the test points with frequencies higher than the two frequency points, 915MHz and 3GHz are taken as examples, the shielding effectiveness of the same holes is different by 10dB, and the shielding effectiveness value of 3GHz can be roughly determined according to the shielding effectiveness monitoring value of 915MHz, or if the shielding effectiveness value monitored by 915MHz has a 10dB margin, the shielding effectiveness value of 3GHz can reach the standard under general conditions.
For information equipment, the main frequency band causing information leakage is the frequency band of 400MHz to 3 GHz. This is because the frequency band carrying the information is within this range, and in addition, signals above this frequency band attenuate to the power of 2 and the attenuation is extremely fast; while signals below this band are limited in transmission by not having wires matching the wavelength as antennas.
For a newly-built shielding body, full-band monitoring needs to be carried out on a wall plate, a filter, a waveguide window, a shielding door and the like. The most problematic shield effectiveness in use is the moving part of the shield, namely the shield door. The common problems of the shielding door include plating oxidation, reed loosening, door plate deformation and the like, the full-band shielding efficiency is greatly reduced, and the rule is proved in long-term testing.
Compared with other frequency points, the radio frequency devices required by the two frequency points are relatively mature, and the indexes and the reliability of some devices are higher, so that the design requirements can be met.
Therefore, by combining the above points, monitoring the frequency points of 433MHz and 915MHz has important guiding significance for understanding the shielding effectiveness of the whole shielding body. At the same time, reducing the monitoring frequency band offers the possibility of reducing the cost and improving the portability of the system and simplifying the operation.
The shielding effectiveness monitoring method comprises the following steps:
step 301: and the user selects the frequency points of 433MHz and 915MHz as monitoring frequency points and sends a user instruction.
Step 302: the user interface 104 receives a user instruction and transmits the user instruction to the central controller 101.
Step 303: the central controller 101 sends a transmission command to the rf module 102, so that the rf module 102 transmits a frequency output signal of a designated monitoring frequency point to the antenna 107, where the frequency output signal is a modulated signal with data and a certain bandwidth.
When the shielding effectiveness monitoring system is in a transmitting mode, the decoder 1025 receives a transmitting command from the central controller 101, converts the transmitting command into a frequency output signal, transmits the frequency output signal and a local oscillation signal generated by the frequency synthesizer to the power amplifier 1027, outputs the local oscillation signal to the antenna 107, and transmits the local oscillation signal; if the strength of the frequency output signal cannot meet the monitoring requirement, the attenuator 1028 may adjust the strength of the frequency output signal to meet the monitoring requirement, and output the adjusted frequency output signal and the local oscillator signal to the antenna 107 for transmission.
Step 304: the central controller 101 sends a command to the rf module 102, so that the rf module 102 receives an rf input signal of a designated monitoring frequency point.
Step 305: under the condition of no shielding body, the antenna 107 receives a radio frequency input signal transmitted by a monitoring frequency point as a calibration value;
step 306: under the condition of a shielding body, an antenna 107 receives a radio frequency input signal transmitted by a monitoring frequency point as a measured value;
step 307: when the shielding effectiveness monitoring system is in a receiving mode, the rf module 102 receives an rf input signal transmitted by the antenna 107, amplifies, modulates, and demodulates the rf input signal, converts the rf input signal into digital data, and transmits the digital data to the central controller 101 for processing;
the radio frequency input signal amplified by the low noise amplifier 1021 and the local oscillator signal generated by the frequency synthesizer 1026 are sent to the mixer 1022, the amplified radio frequency input signal and the local oscillator signal are converted into an intermediate frequency signal by the mixer 1022, the intermediate frequency amplifier 1023 amplifies and filters the intermediate frequency signal and sends the amplified intermediate frequency signal to the demodulator 1024 to be converted into digital data, and the digital data is sent to the central controller 101 for processing; if the rf input signal does not satisfy the monitoring requirement, the attenuator 1028 may adjust the strength of the rf input signal to satisfy the monitoring requirement, and transmit the adjusted rf input signal to the lna 1021.
The digital data includes electric field strength, magnetic field strength, voltage, power, and path loss values of the radio frequency input signal with or without the shield.
Step 308: the central controller 101 receives digital data sent by the radio frequency module 102, including digital data under unshielded condition and shielded condition, and processes the digital data to obtain shielding effectiveness.
One method is to obtain the shielding effectiveness by calculating the rf input signal strength with or without the shield, and the method is as follows:
the shielding effectiveness of the shield is the difference between the calibration value and the measured value, and is expressed by the following formula:
SE＝E1－E2；
SE＝H1－H2；
SE＝V1－V2；
SE＝P1－P2；
in the formula: SE-shielding effectiveness, dB;
E1-the electric field strength of the calibration value, dB μ V/m, measured without a shield;
H1-the magnetic field strength of the calibration value, dB μ T, measured without the shield;
V1-the voltage of the calibration value measured without the shield, dB μ V;
P1-the power of the calibration value measured without shield, dB μ V/m;
E2-the electric field strength of the measured value, dB μ V/m, measured in the presence of the shield;
H2-the magnetic field strength of the measured value, dB μ T, measured in the presence of the shield;
V2-the voltage of the measured value measured in the presence of the shield, dB μ V;
P2measurements taken in the presence of shieldsPower of value, dB μ V/m.
If not applicable to logarithmic units, the formula is as follows:
SEH(dB)＝20lg(H1/H2)
SEE(dB)＝20lg(E1/E2)
in the formula: h1-the magnetic field strength of the calibration value, dB μ T, measured without the shield;
E1-the electric field strength of the calibration value, dB μ V/m, measured without a shield;
H2-the magnetic field strength of the measured value, dB μ T, measured in the presence of the shield;
E2the electric field strength of the measured values, dB μ V/m, measured in the presence of the shield.
Another method is to obtain the shielding effectiveness by calculating the path loss difference with or without the shielding body, and the method is as follows:
the shielding effectiveness of the shield is the difference between the calibration value and the measured value, and is expressed by the following formula:
SE＝PL1－PL2；
in the formula: SE-shielding effectiveness, dB;
PL1-the path loss value of the calibration value, dB, measured without the shield;
PL2the path loss value, dB, of the measured value measured with the shield.
Step 309: the central controller 101 sends the obtained shielding effectiveness and the operation status of the shielding effectiveness monitoring system to the display module 103, so that the user can read the data.
In the operation process of the shielding effectiveness monitoring system, the power management module 106 manages and monitors the power supply of the shielding effectiveness monitoring system in real time, and sends the monitoring data to the central controller 101, so that the central controller 101 can adjust the operation and alarm of the shielding effectiveness monitoring system according to the power supply condition.
The above description is only an embodiment of the invention. The scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention disclosed herein should be covered thereby.
Claims (8)
1. A shielding effectiveness monitoring system, comprising: the system comprises a central controller, a radio frequency module, a user interface, a power management module and an antenna; wherein,
the central controller is used for coordinating the normal working operation of the radio frequency module, the display module, the user interface, the remote communication module, the power management module and the antenna; in a receiving mode, the central controller is configured to receive digital data sent by the radio frequency module, analyze and process the digital data, obtain a shielding effectiveness through a signal strength difference value when a shield is present or absent or a path loss difference value when a shield is present or absent, and send an operating state of the shielding effectiveness monitoring system and the shielding effectiveness to the display module; or, in the transmitting mode, the central controller is configured to receive a user instruction transmitted by the user interface, and the central controller converts the user instruction into a transmitting command and sends the transmitting command to the radio frequency module;
the radio frequency module is used for receiving a radio frequency input signal sent by the antenna, amplifying and demodulating the radio frequency input signal, converting the radio frequency input signal into the digital data and sending the digital data to the central controller for processing; or, the radio frequency module is configured to receive a transmission command sent by the central controller, modulate the transmission command, generate a transmission frequency output signal, and send the transmission frequency output signal to the antenna; the digital data comprises electric field strength, magnetic field strength, voltage, power and path loss values of the radio frequency input signal;
a user interface for inputting the user instruction and transmitting the user instruction to the central controller;
the power management module is used for power supply management and monitoring of the shielding effectiveness monitoring system and sending monitoring data to the central controller;
the antenna is used for receiving the radio frequency input signal transmitted by the monitoring frequency point and transmitting the radio frequency input signal to the radio frequency module; or, the antenna is used for transmitting the frequency output signal; the monitoring frequency points are 433MHz frequency points and 915MHz frequency points.
2. The shielding effectiveness monitoring system of claim 1, wherein: the shielding effectiveness monitoring system comprises a display module, wherein the display module is used for receiving the data processed by the central controller and displaying the running state and the shielding effectiveness of the shielding effectiveness monitoring system.
3. The shielding effectiveness monitoring system of claim 1, wherein: the shielding effectiveness monitoring system comprises the remote communication module, and the remote communication module is used for realizing remote communication.
4. The shielding effectiveness monitoring system of claim 1, wherein: the radio frequency module comprises an antenna interface, an input/output matching circuit and a transceiver; the transceiver comprises a receiver and a generator; the receiver comprises an attenuator, a low noise amplifier, a mixer, an intermediate frequency amplifier, a demodulator and a decoder; the generator comprises a power amplifier and a frequency synthesizer; the frequency synthesizer comprises a crystal oscillator, a phase detector, a charge pump, a voltage-controlled oscillator and a frequency divider; wherein,
the attenuator is used for adjusting the intensity of the radio frequency input signal and transmitting the radio frequency input signal to the low noise amplifier; for adjusting the strength of the frequency output signal for transmission to the antenna;
a low noise amplifier for amplifying the radio frequency input signal for transmission to the mixer;
the mixer is used for converting the amplified radio frequency input signal and the amplified local oscillator signal into an intermediate frequency signal and transmitting the intermediate frequency signal to the intermediate frequency amplifier;
an intermediate frequency amplifier for amplifying and filtering the intermediate frequency signal and transmitting the amplified and filtered intermediate frequency signal to the demodulator;
a demodulator for converting the amplified and filtered intermediate frequency signal into the digital data and transmitting the digital data to the central controller;
a decoder for receiving the transmit command from the central controller, transforming the transmit command into the frequency output signal, and transmitting to the power amplifier;
the frequency synthesizer is used for generating the local oscillation signal and transmitting the local oscillation signal to the frequency mixer or the power amplifier;
and the power amplifier is used for amplifying the frequency output signal and the local oscillation signal and outputting the amplified signals to the attenuator or the antenna.
5. A shielding effectiveness monitoring method, comprising:
the central controller coordinates the normal working operation of the radio frequency module, the display module, the user interface, the remote communication module, the power management module and the antenna; in a receiving mode, the central controller receives digital data sent by the radio frequency module, analyzes and processes the digital data, obtains shielding effectiveness through a signal strength difference value when a shield exists or a path loss difference value when the shield exists or does not exist, and sends the running state of the shielding effectiveness monitoring system and the shielding effectiveness to the display module; or, in a transmitting mode, the central controller receives a user instruction transmitted by the user interface, and the central controller converts the user instruction into a transmitting command and sends the transmitting command to the radio frequency module;
the radio frequency module receives a radio frequency input signal sent by the antenna, amplifies and demodulates the radio frequency input signal, converts the radio frequency input signal into digital data and sends the digital data to the central controller for processing; or, the radio frequency module receives a transmission command sent by the central controller, modulates the transmission command to generate a transmission frequency output signal and sends the transmission frequency output signal to the antenna; the digital data comprises electric field strength, magnetic field strength, voltage, power and path loss values of the radio frequency input signal;
a user interface receives the user instruction and transmits the user instruction to the central controller;
the power management module is used for shielding power supply management and monitoring of the efficiency monitoring system and sending monitoring data to the central controller;
the antenna receives the radio frequency input signal transmitted by the monitoring frequency point and transmits the radio frequency input signal to the radio frequency module; or, when transmitting the monitoring frequency point, the antenna transmits the frequency output signal; the monitoring frequency points are 433MHz frequency points and 915MHz frequency points.
6. The shielding effectiveness monitoring method of claim 5, wherein: and the display module receives the data processed by the central controller and displays the running state and the shielding effectiveness of the shielding effectiveness monitoring system.
7. The shielding effectiveness monitoring method of claim 5, wherein: inputting the user instruction through the remote communication module.
8. The shielding effectiveness monitoring method of claim 5, wherein: the radio frequency module comprises an antenna interface, an input/output matching circuit and a transceiver; the transceiver comprises a receiver and a generator; the receiver comprises an attenuator, a low noise amplifier, a mixer, an intermediate frequency amplifier, a demodulator and a decoder; the generator comprises a power amplifier and a frequency synthesizer; the frequency synthesizer comprises a crystal oscillator, a phase detector, a charge pump, a voltage-controlled oscillator and a frequency divider; wherein,
the attenuator adjusts the intensity of the radio frequency input signal and transmits the radio frequency input signal to the low noise amplifier; adjusting the strength of the frequency output signal and transmitting the frequency output signal to the antenna;
the low-noise amplifier amplifies the radio frequency input signal and transmits the radio frequency input signal to the mixer;
the mixer converts the amplified radio frequency input signal and the local oscillator signal into an intermediate frequency signal and transmits the intermediate frequency signal to the intermediate frequency amplifier;
the intermediate frequency amplifier amplifies and filters the intermediate frequency signal and transmits the amplified and filtered intermediate frequency signal to the demodulator;
the demodulator converts the amplified and filtered intermediate frequency signal into digital data and transmits the digital data to the central controller;
a decoder receives the transmit command from the central controller, transforms the transmit command into the frequency output signal, and transmits the frequency output signal to the power amplifier;
the frequency synthesizer generates the local oscillation signal and transmits the local oscillation signal to the mixer or the power amplifier;
and the power amplifier amplifies the frequency output signal and the local oscillation signal and outputs the amplified signals to the attenuator or the antenna.
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| CN201210120964.0A CN102645591B (en) | 2012-04-23 | 2012-04-23 | Shielding efficiency monitoring system and monitoring method thereof |
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| CN102645591B true CN102645591B (en) | 2015-05-20 |
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| CN110311749B (en) * | 2019-07-04 | 2021-10-01 | 成都立鑫新技术科技有限公司 | Intelligent electromagnetic information protection system |
| CN110535929A (en) * | 2019-08-22 | 2019-12-03 | 北京大泽科技有限公司 | A kind of electromagnet shield effect automated management system |
| CN113691274B (en) * | 2021-09-07 | 2023-03-24 | 芯朴科技(上海)有限公司 | Radio frequency front end module with shielding case and shielding test method thereof |
| CN114189294B (en) * | 2021-12-08 | 2024-11-29 | 中国电信股份有限公司 | Wireless signal detection shielding body detection system and detection method thereof |
| CN116165446B (en) * | 2023-01-03 | 2023-08-11 | 广州力赛计量检测有限公司 | Electromagnetic wave signal management system and method for anechoic chamber |
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