CN102645591B - Shielding efficiency monitoring system and monitoring method thereof - Google Patents
Shielding efficiency monitoring system and monitoring method thereof Download PDFInfo
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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 present invention relates to electromagnetic compatibility monitoring field, specifically, relate to a kind of shield effectiveness monitoring system and monitoring method thereof.
Background technology
Existing shield effectiveness monitoring system signal source is a frequency (single-frequency point) signal source.By the electromagnetic intensity that frequency spectrograph or measuring receiver arrive through antenna measurement, by having, the difference determination shielding properties of unshielded body electromagnetic intensity.
Existing shield effectiveness test macro all adopts spectrum analyzer or measuring receiver measure signal intensity, expensive.
Measuring principle, monitoring system, in order to measure higher shield effectiveness, namely increases the dynamic range of monitoring system, can the output power of increasing power signal source, also can improve the receiving sensitivity of equipment.But these two kinds of methods not very economicals, often the dynamic range of tens dB increase and cause being multiplied of system equipment cost.When design system equipment, the design of power amplifier and LNA may be have necessarily challenging.
System of the present invention adopts radio-frequency communication circuit to carry out data transmit-receive, obtain signal intensity before and after with or without shield by communicating circuit or by the loss of attenuator Circuit tuning and and standard comparison obtain the shield effectiveness value of shield.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of shield effectiveness monitoring system, can reduce costs, and improves the portability of system and simplifies the operation.
Technical scheme of the present invention is as follows:
A kind of shield effectiveness monitoring system, comprising: central controller, radio-frequency module, user interface, power management module and antenna; Wherein, central controller, for coordinating the normal operation of described radio-frequency module, display module, described user interface, remote communication module, described power management module and described antenna; In the receiving mode, the numerical data that described central controller sends for receiving described radio-frequency module, analyzing and processing is carried out to described numerical data, by with or without signal strength difference during shield or by obtaining shield effectiveness with or without path-loss difference value during shield, the running status of described shield effectiveness monitoring system and described shield effectiveness are sent to described display module; Or, in the transmission mode, the user instruction that described central controller transmits for receiving described user interface, described central controller changes described user instruction into firing order and sends to described radio-frequency module; Radio-frequency module, for receiving the radio-frequency input signals that described antenna sends over, amplifying described radio-frequency input signals and demodulation, making described radio-frequency input signals change described numerical data into, and described numerical data is sent to described central controller process; Or the firing order that described radio-frequency module sends for receiving described central controller, outputs signal generating transmission frequency after described firing order modulation and sends to described antenna; Described numerical data comprises the electric field intensity of described radio-frequency input signals, magnetic field intensity, voltage, power and path loss values; User interface, for inputting described user instruction, and is sent to described central controller by described user instruction; Power management module, for power supply management and the monitoring of described shield effectiveness monitoring system, and is sent to described central controller by monitor data; Antenna, for receiving the described radio-frequency input signals that monitoring frequency is launched, and is sent to described radio-frequency module by described radio-frequency input signals; Or described antenna is for launching described frequency output signal.
Further: described shield effectiveness monitoring system comprises display module, described display module, for receiving the data of described central controller process, shows running status and the shield effectiveness of described shield effectiveness monitoring system.
Further: described shield effectiveness monitoring system comprises described remote communication module, and described remote communication module is used for realizing telecommunication.
Further: described radio-frequency module comprises antennal interface, input and output matching circuit and transceiver; Described transceiver comprises receiver and generator; Described receiver comprises attenuator, low noise amplifier, frequency mixer, intermediate frequency amplifier, detuner and demoder; Described generator comprises power amplifier and frequency synthesizer; Described frequency synthesizer comprises crystal oscillator, phase detector, charge pump, voltage controlled oscillator and frequency divider; Wherein, attenuator, for adjusting the intensity of described radio-frequency input signals, is sent to described low noise amplifier; For adjusting the intensity of described frequency output signal, be sent to described antenna; Low noise amplifier, for amplifying described radio-frequency input signals, is sent to described frequency mixer; Frequency mixer, for the described radio-frequency input signals after amplification and described local oscillation signal are transformed to intermediate-freuqncy signal, is sent to described intermediate frequency amplifier; Intermediate frequency amplifier, for described intermediate-freuqncy signal being amplified and filtering, is sent to described detuner; Detuner, for being transformed to described numerical data through amplification and filtered described intermediate-freuqncy signal, will be sent to described central controller; Demoder, for receiving described firing order from described central controller, being transformed to described frequency output signal by described firing order, being sent to described power amplifier; Frequency synthesizer, for generation of described local oscillation signal, is sent to described frequency mixer or described power amplifier; Power amplifier, for described frequency output signal and described local oscillation signal being amplified, outputs to described attenuator or described antenna.
Further: the frequency between the transmitting and receiving He Ne laser 400MHz ~ 6GHz of described radio-frequency module is as monitoring frequency.
Another technical matters to be solved by this invention is to provide a kind of shield effectiveness monitoring method, is applied to this shield effectiveness monitoring system.
Technical scheme of the present invention is as follows:
A kind of shield effectiveness monitoring method, comprising: the normal operation of central controller coordinates radio-frequency module, display module, user interface, remote communication module, power management module and antenna; In the receiving mode, described central controller receives the numerical data that described radio-frequency module sends, analyzing and processing is carried out to described numerical data, by with or without signal strength difference during shield or by obtaining shield effectiveness with or without path-loss difference value during shield, the running status of described shield effectiveness monitoring system and described shield effectiveness are sent to described display module; Or in the transmission mode, described central controller receives the user instruction that described user interface transmits, and described central controller changes described user instruction into firing order and sends to described radio-frequency module; Radio-frequency module receives the radio-frequency input signals that described antenna sends over, and is amplified and demodulation by described radio-frequency input signals, makes described radio-frequency input signals change described numerical data into, and described numerical data is sent to described central controller process; Or described radio-frequency module receives the firing order that described central controller sends, output signal generating transmission frequency after described firing order modulation and send to described antenna; Described numerical data comprises the electric field intensity of described radio-frequency input signals, magnetic field intensity, voltage, power and path loss values; User interface receives described user instruction, and described user instruction is sent to described central controller; The power supply management of shield effectiveness monitoring system described in power management module and monitoring, and monitor data is sent to described central controller; Antenna receives the described radio-frequency input signals that monitoring frequency is launched, and described radio-frequency input signals is sent to described radio-frequency module; Or, when launch monitor frequency, frequency output signal described in described antenna transmission.
Further: described display module receives the data of described central controller process, and show running status and the shield effectiveness of described shield effectiveness monitoring system.
Further: to input described user instruction by described remote communication module.
Further: described radio-frequency module comprises antennal interface, input and output matching circuit and transceiver; Described transceiver comprises receiver and generator; Described receiver comprises attenuator, low noise amplifier, frequency mixer, intermediate frequency amplifier, detuner and demoder; Described generator comprises power amplifier and frequency synthesizer; Described frequency synthesizer comprises crystal oscillator, phase detector, charge pump, voltage controlled oscillator and frequency divider; Wherein, attenuator adjusts the intensity of described radio-frequency input signals, is sent to described low noise amplifier; Adjust the intensity of described frequency output signal, be sent to described antenna; Low noise amplifier amplifies described radio-frequency input signals, is sent to described frequency mixer; Described radio-frequency input signals after amplification and described local oscillation signal are transformed to intermediate-freuqncy signal by frequency mixer, are sent to described intermediate frequency amplifier; Described intermediate-freuqncy signal is amplified and filtering by intermediate frequency amplifier, is sent to described detuner; Detuner will be transformed to described numerical data through amplification and filtered described intermediate-freuqncy signal, be sent to described central controller; Demoder receives described firing order from described central controller, and described firing order is transformed to described frequency output signal, is sent to described power amplifier; Frequency synthesizer produces described local oscillation signal, is sent to described frequency mixer or described power amplifier; Described frequency output signal and described local oscillation signal amplify by power amplifier, output to described attenuator or described antenna;
Further: the frequency between the transmitting and receiving He Ne laser 400MHz ~ 6GHz of described radio-frequency module is as monitoring frequency.
Technique effect of the present invention is as follows:
1, by design of the present invention, can reduce costs, improve the portability of system and simplify the operation;
2, the present invention can be placed in shield, also can be placed on outside shield, has the advantages that antijamming capability is strong.
Accompanying drawing explanation
Fig. 1 is the structural drawing of shield effectiveness monitoring system of the present invention;
Fig. 2 is the schematic diagram of radio-frequency module of the present invention;
Fig. 3 is the process flow diagram of shield effectiveness monitoring method of the present invention.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is described.
As shown in Figure 1, be the structural drawing of shield effectiveness monitoring system of the present invention.Shield effectiveness monitoring system of the present invention comprises on the whole: central controller 101, radio-frequency module 102, display module 103, user interface 104, remote communication module 105, power management module 106 and antenna 107.
Central controller 101 is for coordinating the normal operation of radio-frequency module 102, display module 103, user interface 104, remote communication module 105, power management module 106 and antenna 107; In the receiving mode, the numerical data that central controller 101 received RF module 102 sends, analyzing and processing is carried out to this numerical data, by with or without signal strength difference during shield or by obtaining shield effectiveness with or without path-loss difference value during shield, the running status of this shield effectiveness monitoring system and shield effectiveness are sent to display module 103; In the transmission mode, central controller 101 receives the user instruction that user interface transmits, and central controller 101 changes this user instruction into firing order and sends to radio-frequency module 102.
Radio-frequency module 102, for the radio-frequency input signals that receiving antenna 107 sends over, this radio-frequency input signals is amplified and demodulation, this radio-frequency input signals is made to change numerical data into, and this numerical data is sent to central controller 101 processes, this numerical data comprises the electric field intensity of radio-frequency input signals, magnetic field intensity, voltage, power and path loss values; And, the firing order that radio-frequency module 102 sends for receiving central controller 101, transmission frequency output signal is generated by after the modulation of this firing order, this transmission frequency output signal is the modulation signal with certain bandwidth of attached data, and this transmission frequency output signal sends to antenna 107 to launch.
As shown in Figure 2, be the schematic diagram of radio-frequency module of the present invention.
Radio-frequency module 102 comprises antennal interface, input and output matching circuit and transceiver; This transceiver comprises receiver and generator; This receiver comprises attenuator 1028, low noise amplifier 1021, frequency mixer 1022, intermediate frequency amplifier 1023, detuner 1024 and demoder 1025; This generator comprises power amplifier 1027 and frequency synthesizer 1026; This frequency synthesizer 1026 comprises crystal oscillator, phase detector, charge pump, voltage controlled oscillator and frequency divider.Attenuator 1028, for adjusting the intensity of radio-frequency input signals, is sent to low noise amplifier 1021; For the intensity of output signal of adjusting frequency, be sent to antenna 107; Low noise amplifier 1021, for amplifying radio-frequency input signals, is sent to frequency mixer 1022; Frequency mixer 1022, for the radio-frequency input signals after amplification and local oscillation signal are transformed to intermediate-freuqncy signal, is sent to intermediate frequency amplifier 1023; Intermediate frequency amplifier 1023, for intermediate-freuqncy signal being amplified and filtering, is sent to detuner 1024; Detuner 1024, for being transformed to numerical data through amplification and filtered intermediate-freuqncy signal, will be sent to central controller 101; Demoder 1025, for receiving firing order from central controller 101, is transformed to frequency output signal by firing order, is sent to power amplifier 1027; Frequency synthesizer 1026, for generation of local oscillation signal, is sent to frequency mixer 1022 or power amplifier 1027; Power amplifier 1027, for frequency output signal and local oscillation signal being amplified, outputs to attenuator 1028 or antenna 107.
The principle of work of radio-frequency module 102 is as follows:
When shield effectiveness monitoring system is in receiving mode, the local oscillation signal that radio-frequency input signals after being amplified by low noise amplifier 1021 and frequency synthesizer 1026 are produced is sent to frequency mixer 1022, by frequency mixer 1022, the radio-frequency input signals after amplification and local oscillation signal are transformed to intermediate-freuqncy signal, intermediate frequency amplifier 1023 is transformed to numerical data by being sent to detuner 1024 after intermediate-freuqncy signal amplification and filtering, numerical data is sent to central controller 101;
When shield effectiveness monitoring system is in emission mode, demoder 1025 receives firing order from central controller 101, firing order is transformed to frequency output signal, after the local oscillation signal that frequency output signal and frequency synthesizer 1026 produce is sent to power amplifier 1027, outputs to attenuator 1028 or antenna 107;
When radio-frequency input signals or frequency output signal cannot meet monitoring needs, the intensity of radio-frequency input signals or frequency output signal can also be adjusted by attenuator 1028, with satisfied monitoring needs.
Display module 103 receives the numerical data that central controller 101 processes, and shows running status and the shield effectiveness of this shield effectiveness monitoring system.
User interface 104 receives user instruction, and this user instruction is sent to central controller 101, thus controls the running status of this shield effectiveness monitoring system.
Remote communication module 105 is for realizing telecommunication, and user can utilize remote communication module 105 to input user instruction.
Monitor data for power supply management and monitoring, and is sent to central controller 101 by power management module 106.
The radio-frequency input signals that antenna 107 is launched for receiving monitoring frequency, and this radio-frequency input signals is sent to radio-frequency module 102; At launch monitor frequency, antenna 107 outputs signal for transmission frequency.
Frequency between the transmitting and receiving He Ne laser 400MHz ~ 6GHz of the radio-frequency module that the present invention selects is as monitoring frequency.
In addition, the frequency output signal that shield effectiveness monitoring system of the present invention sends is the modulation signal with certain bandwidth of attached data, shield effectiveness is obtained by the signal strength difference measuring the modulation signal received, or the shield effectiveness that receiving end is calculated by corresponding path-loss difference value after demodulation, the correct reception of decoding.
As shown in Figure 3, be the process flow diagram of shield effectiveness monitoring method of the present invention.In this preferred embodiment, select the frequency of 433MHz and 915MHz as the described monitoring frequency covering efficacy monitoring system.
The estimation equation of hole electromagnetic leakage is as follows:
SE＝100－20lg(L)－20lg(f)+20lg(1+2.3lg(L/H))
The length (mm) in L=gap;
The width (mm) in H=gap;
F=incoming electromagnetic wave frequency (MHz).
As can be seen from above-mentioned estimation equation, if the shield effectiveness of the frequency of 433MHz and 915MHz can meet the requirement of shield effectiveness monitoring, then the monitoring lower than this two frequency also meets the demands.For the test point of frequency higher than this two frequency bins, for 915MHz and 3GHz, identical hole, shield effectiveness difference 10dB, the shield effectiveness value of 3GHz roughly can be judged according to the shield effectiveness monitor value of 915MHz, or, if the shield effectiveness value of 915MHz monitoring has 10dB surplus, generally, the shield effectiveness value of 3GHz also can be up to standard.
For information equipment, cause the main frequency range of information leakage in this frequency range of 400MHz ~ 3GHz.This is because the frequency range of carry information is within the scope of this, in addition, the signal higher than this frequency range is decayed with 2 powers, and decay is exceedingly fast; And launch limited lower than the signal of this frequency range as antenna due to the wire not mating wavelength.
For newly-built shield, need monitoring wallboard, wave filter, waveguide window and shield door etc. being carried out to full frequency band.In use, the movable part of what shield effectiveness the most easily went wrong is shield, i.e. shield door.The FAQs of shield door has the problems such as coating is oxidized, reed gets loose, door plate deformation, all can cause declining to a great extent of full frequency band shield effectiveness, from long-term test, also confirm this rule.
Relative to other frequencies, the radio-frequency devices relative maturity needed for this two frequency bins, index and the reliability of some device are higher, can meet design requirement.
Therefore, comprehensive what time above, the frequency of monitoring 433MHz and 915MHz has important directive significance for the shield effectiveness understanding shield entirety.Meanwhile, monitoring frequency range is reduced for reducing costs and improving the portability of system and simplify the operation and provide possibility.
Shield effectiveness monitoring method step of the present invention is as follows:
Step 301: user selects the frequency of 433MHz and 915MHz as monitoring frequency, sends user instruction.
Step 302: user interface 104 receives user instruction, and this user instruction is sent to central controller 101.
Step 303: central controller 101 sends firing order to radio-frequency module 102, radio-frequency module 102 is launched and specifies the frequency output signal of monitoring frequency to send after antenna 107, this frequency output signal is the modulation signal with certain bandwidth of attached data.
When shield effectiveness monitoring system is in emission mode, demoder 1025 receives firing order from central controller 101, firing order is transformed to frequency output signal, sends after outputting to antenna 107 after the local oscillation signal that frequency output signal and frequency synthesizer produce is sent to power amplifier 1027; If when the intensity of frequency output signal can not meet monitoring needs, attenuator 1028 can adjust frequency output signal intensity with satisfied monitoring needs, by adjustment after frequency output signal and local oscillation signal output to antenna 107 after send.
Step 304: central controller 101 sends a command to radio-frequency module 102, makes radio-frequency module 102 receive the radio-frequency input signals of specifying monitoring frequency.
Step 305: under unshielded concrete conditions in the establishment of a specific crime, antenna 107 receives the radio-frequency input signals of monitoring frequency transmitting as calibration value;
Step 306: having under shield condition, antenna 107 receives the radio-frequency input signals of monitoring frequency transmitting as measured value;
Step 307: when shield effectiveness monitoring system is in receiving mode, the radio-frequency input signals that radio-frequency module 102 receiving antenna 107 sends, this radio-frequency input signals amplifies, modulation and demodulation, make this radio-frequency input signals change numerical data into, this numerical data is sent to central controller 101 and processes;
The local oscillation signal that radio-frequency input signals after being amplified by low noise amplifier 1021 and frequency synthesizer 1026 are produced is sent to frequency mixer 1022, by frequency mixer 1022, the radio-frequency input signals after amplification and local oscillation signal are transformed to intermediate-freuqncy signal, intermediate frequency amplifier 1023 is transformed to numerical data by being sent to detuner 1024 after intermediate-freuqncy signal amplification and filtering, numerical data is sent to central controller 101 and processes; If when radio-frequency input signals can not meet monitoring needs, attenuator 1028 can adjust the intensity of radio-frequency input signals with satisfied monitoring needs, and the radio-frequency input signals after adjustment is sent to low noise amplifier 1021.
This numerical data comprises with or without the electric field intensity of radio-frequency input signals during shield, magnetic field intensity, voltage, power and path loss values.
Step 308: the numerical data that central controller 101 received RF module 102 sends, comprises unshielded condition and the numerical data under having shielding condition, processes, obtain shield effectiveness to this numerical data.
Method obtains a shield effectiveness by calculating with or without radio-frequency input signals intensity during shield, and method is as follows:
The shield effectiveness of shield is the difference of calibration value and measured value, is formulated as follows:
SE＝E
1－E
2；
SE＝H
1－H
2；
SE＝V
1－V
2；
SE＝P
1－P
2；
In formula: SE---shield effectiveness, dB;
E
1---the electric field intensity of the calibration value recorded during unshielded body, dB μ V/m;
H
1---the magnetic field intensity of the calibration value recorded during unshielded body, dB μ T;
V
1---the voltage of the calibration value recorded during unshielded body, dB μ V;
P
1---the power of the calibration value recorded during unshielded body, dB μ V/m;
E
2---the electric field intensity of the measured value recorded when there is shield, dB μ V/m;
H
2---the magnetic field intensity of the measured value recorded when there is shield, dB μ T;
V
2---the voltage of the measured value recorded when there is shield, dB μ V;
P
2---the power of the measured value recorded when there is shield, dB μ V/m.
As inapplicable log unit, its formula is expressed as follows:
SE
H(dB)＝20lg(H
1/H
2)
SE
E(dB)＝20lg(E
1/E
2)
In formula: H
1---the magnetic field intensity of the calibration value recorded during unshielded body, dB μ T;
E
1---the electric field intensity of the calibration value recorded during unshielded body, dB μ V/m;
H
2---the magnetic field intensity of the measured value recorded when there is shield, dB μ T;
E
2---the electric field intensity of the measured value recorded when there is shield, dB μ V/m.
Another kind method obtains shield effectiveness by calculating with or without path-loss difference value during shield, and method is as follows:
The shield effectiveness of shield is the difference of calibration value and measured value, is formulated as follows:
SE＝PL
1－PL
2；
In formula: SE---shield effectiveness, dB;
PL
1---the path loss values of the calibration value recorded during unshielded body, dB;
PL
2---there is the path loss values of the measured value recorded during shield, dB.
Step 309: the running status of the shield effectiveness obtained and shield effectiveness monitoring system is sent to display module 103 by central controller 101, makes user read data.
In shield effectiveness monitoring system operational process, the power supply of power management module 106 real-time management and monitoring shielding efficacy monitoring system, and monitor data is sent to central controller 101, so that central controller 101 is according to the operation of electric power thus supplied adjustment shield effectiveness monitoring system and warning.
The above, be only the embodiment of invention.Protection scope of the present invention is not limited thereto, and is anyly familiar with those skilled in the art in the technical scope that the present invention discloses, the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (8)
1. a shield effectiveness monitoring system, is characterized in that, comprising: central controller, radio-frequency module, user interface, power management module and antenna; Wherein,
Central controller, for coordinating the normal operation of described radio-frequency module, display module, described user interface, remote communication module, described power management module and described antenna; In the receiving mode, the numerical data that described central controller sends for receiving described radio-frequency module, analyzing and processing is carried out to described numerical data, by with or without signal strength difference during shield or by obtaining shield effectiveness with or without path-loss difference value during shield, the running status of described shield effectiveness monitoring system and described shield effectiveness are sent to described display module; Or, in the transmission mode, the user instruction that described central controller transmits for receiving described user interface, described central controller changes described user instruction into firing order and sends to described radio-frequency module;
Radio-frequency module, for receiving the radio-frequency input signals that described antenna sends over, amplifying described radio-frequency input signals and demodulation, making described radio-frequency input signals change described numerical data into, and described numerical data is sent to described central controller process; Or the firing order that described radio-frequency module sends for receiving described central controller, outputs signal generating transmission frequency after described firing order modulation and sends to described antenna; Described numerical data comprises the electric field intensity of described radio-frequency input signals, magnetic field intensity, voltage, power and path loss values;
User interface, for inputting described user instruction, and is sent to described central controller by described user instruction;
Power management module, for power supply management and the monitoring of described shield effectiveness monitoring system, and is sent to described central controller by monitor data;
Antenna, for receiving the described radio-frequency input signals that monitoring frequency is launched, and is sent to described radio-frequency module by described radio-frequency input signals; Or described antenna is for launching described frequency output signal; Described monitoring frequency is the frequency of 433MHz and 915MHz.
2. shield effectiveness monitoring system as claimed in claim 1, it is characterized in that: described shield effectiveness monitoring system comprises display module, described display module, for receiving the data of described central controller process, shows running status and the shield effectiveness of described shield effectiveness monitoring system.
3. shield effectiveness monitoring system as claimed in claim 1, is characterized in that: described shield effectiveness monitoring system comprises described remote communication module, and described remote communication module is used for realizing telecommunication.
4. shield effectiveness monitoring system as claimed in claim 1, is characterized in that: described radio-frequency module comprises antennal interface, input and output matching circuit and transceiver; Described transceiver comprises receiver and generator; Described receiver comprises attenuator, low noise amplifier, frequency mixer, intermediate frequency amplifier, detuner and demoder; Described generator comprises power amplifier and frequency synthesizer; Described frequency synthesizer comprises crystal oscillator, phase detector, charge pump, voltage controlled oscillator and frequency divider; Wherein,
Attenuator, for adjusting the intensity of described radio-frequency input signals, is sent to described low noise amplifier; For adjusting the intensity of described frequency output signal, be sent to described antenna;
Low noise amplifier, for amplifying described radio-frequency input signals, is sent to described frequency mixer;
Frequency mixer, for the described radio-frequency input signals after amplification and local oscillation signal are transformed to intermediate-freuqncy signal, is sent to described intermediate frequency amplifier;
Intermediate frequency amplifier, for described intermediate-freuqncy signal being amplified and filtering, is sent to described detuner;
Detuner, for being transformed to described numerical data through amplification and filtered described intermediate-freuqncy signal, will be sent to described central controller;
Demoder, for receiving described firing order from described central controller, being transformed to described frequency output signal by described firing order, being sent to described power amplifier;
Frequency synthesizer, for generation of described local oscillation signal, is sent to described frequency mixer or described power amplifier;
Power amplifier, for described frequency output signal and described local oscillation signal being amplified, outputs to described attenuator or described antenna.
5. a shield effectiveness monitoring method, comprising:
The normal operation of central controller coordinates radio-frequency module, display module, user interface, remote communication module, power management module and antenna; In the receiving mode, described central controller receives the numerical data that described radio-frequency module sends, analyzing and processing is carried out to described numerical data, by with or without signal strength difference during shield or by obtaining shield effectiveness with or without path-loss difference value during shield, the running status of described shield effectiveness monitoring system and described shield effectiveness are sent to described display module; Or in the transmission mode, described central controller receives the user instruction that described user interface transmits, and described central controller changes described user instruction into firing order and sends to described radio-frequency module;
Radio-frequency module receives the radio-frequency input signals that described antenna sends over, and is amplified and demodulation by described radio-frequency input signals, makes described radio-frequency input signals change described numerical data into, and described numerical data is sent to described central controller process; Or described radio-frequency module receives the firing order that described central controller sends, output signal generating transmission frequency after described firing order modulation and send to described antenna; Described numerical data comprises the electric field intensity of described radio-frequency input signals, magnetic field intensity, voltage, power and path loss values;
User interface receives described user instruction, and described user instruction is sent to described central controller;
Power management module is used for power supply management and the monitoring of shield effectiveness monitoring system, and monitor data is sent to described central controller;
Antenna receives the described radio-frequency input signals that monitoring frequency is launched, and described radio-frequency input signals is sent to described radio-frequency module; Or, when launch monitor frequency, frequency output signal described in described antenna transmission; Described monitoring frequency is the frequency of 433MHz and 915MHz.
6. shield effectiveness monitoring method as claimed in claim 5, is characterized in that: described display module receives the data of described central controller process, and shows running status and the shield effectiveness of described shield effectiveness monitoring system.
7. shield effectiveness monitoring method as claimed in claim 5, is characterized in that: input described user instruction by described remote communication module.
8. shield effectiveness monitoring method as claimed in claim 5, is characterized in that: described radio-frequency module comprises antennal interface, input and output matching circuit and transceiver; Described transceiver comprises receiver and generator; Described receiver comprises attenuator, low noise amplifier, frequency mixer, intermediate frequency amplifier, detuner and demoder; Described generator comprises power amplifier and frequency synthesizer; Described frequency synthesizer comprises crystal oscillator, phase detector, charge pump, voltage controlled oscillator and frequency divider; Wherein,
Attenuator adjusts the intensity of described radio-frequency input signals, is sent to described low noise amplifier; Adjust the intensity of described frequency output signal, be sent to described antenna;
Low noise amplifier amplifies described radio-frequency input signals, is sent to described frequency mixer;
Described radio-frequency input signals after amplification and local oscillation signal are transformed to intermediate-freuqncy signal by frequency mixer, are sent to described intermediate frequency amplifier;
Described intermediate-freuqncy signal is amplified and filtering by intermediate frequency amplifier, is sent to described detuner;
Detuner will be transformed to described numerical data through amplification and filtered described intermediate-freuqncy signal, be sent to described central controller;
Demoder receives described firing order from described central controller, and described firing order is transformed to described frequency output signal, is sent to described power amplifier;
Frequency synthesizer produces described local oscillation signal, is sent to described frequency mixer or described power amplifier;
Described frequency output signal and described local oscillation signal amplify by power amplifier, output to described attenuator or described antenna.
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| CN109884407B (en) * | 2019-03-28 | 2021-02-23 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Electromagnetic shielding effectiveness measuring system and measuring method |
| 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 |
| CN114189294A (en) * | 2021-12-08 | 2022-03-15 | 中国电信股份有限公司 | Wireless signal detection shield 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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3492568A (en) * | 1967-10-05 | 1970-01-27 | Tamar Electronics Ind Inc | Checking the radio frequency shielding effectivity of an enclosure with an rf transmitter connected to enclosure surfaces and fr receiver to sense surface current at leakage points |
| US5828220A (en) * | 1995-11-02 | 1998-10-27 | The United States Of America As Represented By The Secretary Of The Army | Method and system utilizing radio frequency for testing the electromagnetic shielding effectiveness of an electromagnetically shielded enclosure |
| US20090058426A1 (en) * | 2006-08-30 | 2009-03-05 | L-3 Communications Corporation, A Delaware Corporation | Electromagnetic shielding defect monitoring system and method for using the same |
| WO2009066267A1 (en) * | 2007-11-21 | 2009-05-28 | Nokia Corporation | Qualify method for shielding of transceiver rf block |
| CN101662078A (en) * | 2009-07-30 | 2010-03-03 | 北京大泽科技有限公司 | Small shielding body electromagnetic shielding performance testing device, system and method therefor |
| CN201535803U (en) * | 2009-07-30 | 2010-07-28 | 北京大泽科技有限公司 | Electromagnetic shielding efficiency test device and system of large shielding body |
-
2012
- 2012-04-23 CN CN201210120964.0A patent/CN102645591B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3492568A (en) * | 1967-10-05 | 1970-01-27 | Tamar Electronics Ind Inc | Checking the radio frequency shielding effectivity of an enclosure with an rf transmitter connected to enclosure surfaces and fr receiver to sense surface current at leakage points |
| US5828220A (en) * | 1995-11-02 | 1998-10-27 | The United States Of America As Represented By The Secretary Of The Army | Method and system utilizing radio frequency for testing the electromagnetic shielding effectiveness of an electromagnetically shielded enclosure |
| US20090058426A1 (en) * | 2006-08-30 | 2009-03-05 | L-3 Communications Corporation, A Delaware Corporation | Electromagnetic shielding defect monitoring system and method for using the same |
| WO2009066267A1 (en) * | 2007-11-21 | 2009-05-28 | Nokia Corporation | Qualify method for shielding of transceiver rf block |
| CN101662078A (en) * | 2009-07-30 | 2010-03-03 | 北京大泽科技有限公司 | Small shielding body electromagnetic shielding performance testing device, system and method therefor |
| CN201535803U (en) * | 2009-07-30 | 2010-07-28 | 北京大泽科技有限公司 | Electromagnetic shielding efficiency test device and system of large shielding body |
Non-Patent Citations (5)
| Title |
|---|
| Carl J Weisman著,刘志华 等译.射频无线技术入门.《射频无线技术入门》.清华大学出版社,2005,19-62. * |
| 典型机箱的电磁屏蔽效能测试及电磁泄漏分析;钟文彬 等;《电子质量》;20100920(第9期);全文 * |
| 林云 等.射频通信电路.《射频通信电路》.华中科技大学出版社,2009,53-295. * |
| 箱式屏蔽效能测试方法设计;王化吉 等;《安全与电磁兼容》;20100425(第2期);全文 * |
| 陈世钢 等.电磁屏蔽室屏蔽效能的测量方法.《GB/T 12190-2006电磁屏蔽室屏蔽效能的测量方法》.中国标准出版社,2006,1-28. * |
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