CN102645591A - Shielding efficiency monitoring system and monitoring method thereof - Google Patents
Shielding efficiency monitoring system and monitoring method thereof Download PDFInfo
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- CN102645591A CN102645591A CN2012101209640A CN201210120964A CN102645591A CN 102645591 A CN102645591 A CN 102645591A CN 2012101209640 A CN2012101209640 A CN 2012101209640A CN 201210120964 A CN201210120964 A CN 201210120964A CN 102645591 A CN102645591 A CN 102645591A
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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.The electromagnetic intensity that arrives through antenna measurement through frequency spectrograph or measuring receiver, through have, the difference of unshielded body electromagnetic intensity confirms shielding properties.
Existing shield effectiveness test macro all adopts spectrum analyzer or measuring receiver measure signal intensity, costs an arm and a leg.
In view of measuring principle, monitoring system just increases the dynamic range of monitoring system in order to measure higher shield effectiveness, can increase the output power of power signal source, also can improve the receiving sensitivity of equipment.But these two kinds of methods are very economical not, often the increase of the dynamic range of tens dB and cause being multiplied of system equipment cost.When design system equipment, the design of power amplifier and LNA possibly be have necessarily challenging.
System of the present invention adopts the radio-frequency communication circuit to carry out data transmit-receive, obtains having or not the signal intensity before and after the shield or compares the shield effectiveness value that obtains shield through attenuator adjustment circuit loss and with standard through communicating circuit.
Summary of the invention
Technical matters to be solved by this invention provides a kind of shield effectiveness monitoring system, can reduce cost, the portability that improves system with simplify the operation.
Technical scheme of the present invention is following:
A kind of shield effectiveness monitoring system comprises: central controller, radio-frequency module, user interface, power management module and antenna; Wherein, central controller is used to coordinate the normal operation of said radio-frequency module, display module, said user interface, remote communication module, said power management module and said antenna; Under receiving mode; Said central controller is used to receive the numerical data that said radio-frequency module sends; Said numerical data is carried out analyzing and processing; Signal strength difference when having or not shield or the path-loss difference value when having or not shield obtain shield effectiveness, and the running status and the said shield effectiveness of said shield effectiveness monitoring system sent to said display module; Perhaps, under emission mode, said central controller is used to receive the user instruction that said user interface transmits, and said central controller changes said user instruction into firing order and sends to said radio-frequency module; Radio-frequency module is used to receive the radio-frequency input signals that said antenna transmission is come, and said radio-frequency input signals is amplified and demodulation, makes said radio-frequency input signals change said numerical data into, and said numerical data is sent to said central controller processing; Perhaps, said radio-frequency module is used to receive the firing order that said central controller sends, and said firing order modulation back is generated transmission frequency output signal and sends to said antenna; Said numerical data comprises electric field intensity, magnetic field intensity, voltage, power and the path loss values of said radio-frequency input signals; User interface is used to import said user instruction, and said user instruction is sent to said central controller; Power management module is used for the power supply management and the monitoring of said shield effectiveness monitoring system, and monitor data is sent to said central controller; Antenna is used to receive the said radio-frequency input signals that the monitoring frequency is launched, and said radio-frequency input signals is sent to said radio-frequency module; Perhaps, said antenna is used to launch said frequency output signal.
Further: said shield effectiveness monitoring system comprises display module, and said display module is used to receive the data that said central controller is handled, and shows the running status and the shield effectiveness of said shield effectiveness monitoring system.
Further: said shield effectiveness monitoring system comprises said remote communication module, and said remote communication module is used to realize telecommunication.
Further: said radio-frequency module comprises antennal interface, input and output matching circuit and transceiver; Said transceiver comprises receiver and generator; Said receiver comprises attenuator, low noise amplifier, frequency mixer, intermediate frequency amplifier, detuner and demoder; Said transmitter comprises power amplifier and frequency synthesizer; Said frequency synthesizer comprises crystal oscillator, phase detector, charge pump, voltage controlled oscillator and frequency divider; Wherein, attenuator is used to adjust the intensity of said radio-frequency input signals, is sent to said low noise amplifier; Be used to adjust the intensity of said frequency output signal, be sent to said antenna; Low noise amplifier is used to amplify said radio-frequency input signals, is sent to said frequency mixer; Frequency mixer is used for said radio-frequency input signals and said local oscillation signal after amplifying are transformed to intermediate-freuqncy signal, is sent to said intermediate frequency amplifier; Intermediate frequency amplifier is used for said intermediate-freuqncy signal is amplified and filtering, is sent to said detuner; Detuner is used for process amplification and filtered said intermediate-freuqncy signal are transformed to said numerical data, is sent to said central controller; Demoder is used for receiving said firing order from said central controller, and said firing order is transformed to said frequency output signal, is sent to said power amplifier; Frequency synthesizer is used to produce said local oscillation signal, is sent to said frequency mixer or said power amplifier; Power amplifier is used for said frequency output signal and said local oscillation signal are amplified, and outputs to said attenuator or said antenna.
Further: the frequency that transmits and receives of said radio-frequency module selects frequency between 400MHz～6GHz as the monitoring frequency.
Another technical matters to be solved by this invention provides a kind of shield effectiveness monitoring method, is applied to this shield effectiveness monitoring system.
Technical scheme of the present invention is following:
A kind of shield effectiveness monitoring method comprises: central controller is coordinated the normal operation of radio-frequency module, display module, user interface, remote communication module, power management module and antenna; Under receiving mode; Said central controller receives the numerical data that said radio-frequency module sends; Said numerical data is carried out analyzing and processing; Signal strength difference when having or not shield or the path-loss difference value when having or not shield obtain shield effectiveness, and the running status and the said shield effectiveness of said shield effectiveness monitoring system sent to said display module; Perhaps, under emission mode, said central controller receives the user instruction that said user interface transmits, and said central controller changes said user instruction into firing order and sends to said radio-frequency module; Radio-frequency module receives the radio-frequency input signals that said antenna transmission is come, and said radio-frequency input signals is amplified and demodulation, makes said radio-frequency input signals change said numerical data into, and said numerical data is sent to said central controller processing; Perhaps, said radio-frequency module receives the firing order that said central controller sends, and said firing order modulation back is generated transmission frequency output signal and sends to said antenna; Said numerical data comprises electric field intensity, magnetic field intensity, voltage, power and the path loss values of said radio-frequency input signals; User interface receives said user instruction, and said user instruction is sent to said central controller; The power supply management and the monitoring of the said shield effectiveness monitoring system of power management module, and monitor data sent to said central controller; Antenna receives the said radio-frequency input signals of monitoring frequency emission, and said radio-frequency input signals is sent to said radio-frequency module; Perhaps, when the launch monitor frequency, said antenna is launched said frequency output signal.
Further: said display module receives the data that said central controller is handled, and shows the running status and the shield effectiveness of said shield effectiveness monitoring system.
Further: import said user instruction through said remote communication module.
Further: said radio-frequency module comprises antennal interface, input and output matching circuit and transceiver; Said transceiver comprises receiver and generator; Said receiver comprises attenuator, low noise amplifier, frequency mixer, intermediate frequency amplifier, detuner and demoder; Said transmitter comprises power amplifier and frequency synthesizer; Said frequency synthesizer comprises crystal oscillator, phase detector, charge pump, voltage controlled oscillator and frequency divider; Wherein, attenuator is adjusted the intensity of said radio-frequency input signals, is sent to said low noise amplifier; Adjust the intensity of said frequency output signal, be sent to said antenna; Low noise amplifier amplifies said radio-frequency input signals, is sent to said frequency mixer; Said radio-frequency input signals and said local oscillation signal after frequency mixer will amplify are transformed to intermediate-freuqncy signal, are sent to said intermediate frequency amplifier; Intermediate frequency amplifier amplifies said intermediate-freuqncy signal and filtering, is sent to said detuner; Detuner will pass through amplification and filtered said intermediate-freuqncy signal is transformed to said numerical data, be sent to said central controller; Demoder receives said firing order from said central controller, and said firing order is transformed to said frequency output signal, is sent to said power amplifier; Frequency synthesizer produces said local oscillation signal, is sent to said frequency mixer or said power amplifier; Power amplifier amplifies said frequency output signal and said local oscillation signal, outputs to said attenuator or said antenna;
Further: the frequency that transmits and receives of said radio-frequency module selects frequency between 400MHz～6GHz as the monitoring frequency.
Technique effect of the present invention is following:
1, through design of the present invention, can reduce cost, the portability that improves system with simplify the operation;
2, the present invention can be placed in the shield, also can be placed on outside the shield, has the strong characteristics of antijamming capability.
Description of drawings
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
Describe below in conjunction with the embodiment specific embodiments of the invention.
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 used to coordinate 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; Under receiving mode; The numerical data that central controller 101 received RF modules 102 are sent; This numerical data is carried out analyzing and processing; Signal strength difference when having or not shield or the path-loss difference value when having or not shield obtain shield effectiveness, and the running status and the shield effectiveness of this shield effectiveness monitoring system sent to display module 103; Under emission 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; Be used for the radio-frequency input signals that receiving antenna 107 sends over; This radio-frequency input signals is amplified and demodulation; Make this radio-frequency input signals change numerical data into, and this numerical data is sent to central controller 101 processing, this numerical data comprises electric field intensity, magnetic field intensity, voltage, power and the path loss values of radio-frequency input signals; And; Radio-frequency module 102 is used to receive the firing order that central controller 101 sends; This firing order modulation back is generated transmission frequency output signal; 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 and launches.
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 transmitter 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 is used to adjust the intensity of radio-frequency input signals, is sent to low noise amplifier 1021; Be used to adjust frequency and export the intensity of signal, be sent to antenna 107; Low noise amplifier 1021 is used to amplify radio-frequency input signals, is sent to frequency mixer 1022; Frequency mixer 1022 is used for radio-frequency input signals and local oscillation signal after amplifying are transformed to intermediate-freuqncy signal, is sent to intermediate frequency amplifier 1023; Intermediate frequency amplifier 1023 is used for intermediate-freuqncy signal is amplified and filtering, is sent to detuner 1024; Detuner 1024 is used for process amplification and filtered intermediate-freuqncy signal are transformed to numerical data, is sent to central controller 101; Demoder 1025 is used for receiving firing order from central controller 101, and firing order is transformed to frequency output signal, is sent to power amplifier 1027; Frequency synthesizer 1026 is used to produce local oscillation signal, is sent to frequency mixer 1022 or power amplifier 1027; Power amplifier 1027 is used for frequency is exported signal and local oscillation signal amplification, outputs to attenuator 1028 or antenna 107.
The principle of work of radio-frequency module 102 is following:
When the shield effectiveness monitoring system is in receiving mode; The local oscillation signal that radio-frequency input signals after will amplifying through low noise amplifier 1021 and frequency synthesizer 1026 produce sends to frequency mixer 1022; Radio-frequency input signals and local oscillation signal after will amplifying through frequency mixer 1022 are transformed to intermediate-freuqncy signal; Intermediate frequency amplifier 1023 intermediate-freuqncy signal is amplified and filtering after send to detuner 1024 and be transformed to numerical data, numerical data is sent to central controller 101;
When the 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, frequency is exported outputed to perhaps antenna 107 of attenuator 1028 after local oscillation signal that signal and frequency synthesizer 1026 produce sends to power amplifier 1027;
When radio-frequency input signals or frequency output signal can't satisfy monitoring needs, can also be through the intensity of attenuator 1028 adjustment radio-frequency input signalss or frequency output signal, with satisfied monitoring needs.
Display module 103 receives the numerical data that central controller 101 is handled, and shows the 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, thereby controls the running status of this shield effectiveness monitoring system.
Remote communication module 105 is used to realize telecommunication, and the user can utilize remote communication module 105 input user instructions.
Power management module 106 is used for power supply management and monitoring, and monitor data is sent to central controller 101.
Antenna 107 is used to receive the radio-frequency input signals of monitoring frequency emission, and this radio-frequency input signals is sent to radio-frequency module 102; At the launch monitor frequency, antenna 107 is used for transmission frequency output signal.
The frequency that transmits and receives of the radio-frequency module that the present invention selects selects frequency between 400MHz～6GHz as the monitoring frequency.
In addition; The frequency output signal that shield effectiveness monitoring system of the present invention is sent is the modulation signal with certain bandwidth of attached data; The signal strength difference of the modulation signal that receives through measurement obtains shield effectiveness, and perhaps receiving end receives the shield effectiveness that the path-loss difference value of back through correspondence calculates through demodulation, decoding are correct.
As shown in Figure 3, be the process flow diagram of shield effectiveness monitoring method of the present invention.In this preferred embodiment, the frequency of selecting 433MHz and 915MHz is as the said monitoring frequency that covers the efficacy monitoring system.
The estimation equation of hole electromagnetic leakage is following:
SE＝100-20lg(L)-20lg(f)+20lg(1+2.3lg(L/H))
The length in L=slit (mm);
The width in H=slit (mm);
The frequency of f=incident electromagnetic wave (MHz).
Can find out that from above-mentioned estimation equation if the shield effectiveness of the frequency of 433MHz and 915MHz can satisfy the requirement of shield effectiveness monitoring, the monitoring that then is lower than this two frequency also meets the demands.Being higher than the test point of these two frequencies for frequency, is example with 915MHz and 3GHz, identical hole; Shield effectiveness differs 10dB; Can roughly judge the shield effectiveness value of 3GHz according to the shield effectiveness monitor value of 915MHz, perhaps, if the shield effectiveness value of 915MHz monitoring has the 10dB surplus; Generally speaking, the shield effectiveness value of 3GHz also can be up to standard.
For information equipment, the main frequency range that causes information leakage is in this frequency range of 400MHz～3GHz.This be because the frequency range of carrying information in this scope, in addition, the signal that is higher than this frequency range decay with 2 powers, and decays and be exceedingly fast; And the signal that is lower than this frequency range is owing to the lead that does not have matching wavelengths is launched limited as antenna.
For newly-built shield, need carry out the monitoring of full frequency band to wallboard, wave filter, waveguide window and shield door etc.In use, what shield effectiveness went wrong the most easily is the movable part of shield, i.e. shield door.The FAQs of shield door has problems such as coating oxidation, reed get loose, door-plate distortion, all can cause declining to a great extent of full frequency band shield effectiveness, from long-term test, has also confirmed this rule.
With respect to other frequencies, the required radio-frequency devices of these two frequencies is ripe relatively, and the 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 understanding the whole shield effectiveness of shield.Simultaneously, reduce to monitor frequency range and possibility is provided for reducing cost and improving the portable of system and simplify the operation.
Shield effectiveness monitoring method step of the present invention is following:
Step 301: the user selects the frequency of 433MHz and 915MHz as the 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, makes radio-frequency module 102 emissions specify the frequency output signal of monitoring frequency behind antenna 107, to send, and this frequency output signal is the modulation signal with certain bandwidth of attached data.
When the 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, and the local oscillation signal that frequency is exported signal and frequency synthesizer generation sends after sending to and outputing to antenna 107 behind the power amplifier 1027; When if the intensity of frequency output signal can not satisfy monitoring needs, attenuator 1028 can be adjusted frequency the intensity of output signal satisfying the monitoring needs, adjusted frequency is exported sent after signal and local oscillation signal output to antenna 107.
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 the 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 emission as calibration value;
Step 306: having under the shield condition, antenna 107 receives the radio-frequency input signals of monitoring frequency emission as measured value;
Step 307: when the shield effectiveness monitoring system is in receiving mode; The radio-frequency input signals that radio-frequency module 102 receiving antennas 107 send; 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 handle;
The local oscillation signal that radio-frequency input signals after will amplifying through low noise amplifier 1021 and frequency synthesizer 1026 produce sends to frequency mixer 1022; Radio-frequency input signals and local oscillation signal after will amplifying through frequency mixer 1022 are transformed to intermediate-freuqncy signal; Intermediate frequency amplifier 1023 with intermediate-freuqncy signal amplify with filtering after send to detuner 1024 and be transformed to numerical data, numerical data is sent to central controller 101 processing; When if radio-frequency input signals can not satisfy the monitoring needs, attenuator 1028 can be adjusted the intensity of radio-frequency input signals to satisfy the monitoring needs, and adjusted radio-frequency input signals is sent to low noise amplifier 1021.
This numerical data comprises electric field intensity, magnetic field intensity, voltage, power and the path loss values of the radio-frequency input signals when having or not shield.
Step 308: the numerical data that central controller 101 received RF modules 102 are sent, comprise unshielded condition and the numerical data under the shielding condition is arranged, this numerical data is handled, obtain shield effectiveness.
A kind of method is that the radio-frequency input signals intensity when having or not shield through calculating obtains shield effectiveness, and method is following:
The shield effectiveness of shield is the poor 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 the formula: SE---shield effectiveness, dB;
E
1---the electric field intensity of the calibration value that records during unshielded body, dB μ V/m;
H
1---the magnetic field intensity of the calibration value that records during unshielded body, dB μ T;
V
1---the voltage of the calibration value that records during unshielded body, dB μ V;
P
1---the power of the calibration value that records during unshielded body, dB μ V/m;
E
2---the electric field intensity of the measured value that records when having shield, dB μ V/m;
H
2---the magnetic field intensity of the measured value that records when having shield, dB μ T;
V
2---the voltage of the measured value that records when having shield, dB μ V;
P
2---the power of the measured value that records when having shield, dB μ V/m.
Like inapplicable log unit, its formulate is following:
SE
H(dB)＝20lg(H
1/H
2)
SE
E(dB)＝20lg(E
1/E
2)
In the formula: H
1---the magnetic field intensity of the calibration value that records during unshielded body, dB μ T;
E
1---the electric field intensity of the calibration value that records during unshielded body, dB μ V/m;
H
2---the magnetic field intensity of the measured value that records when having shield, dB μ T;
E
2---the electric field intensity of the measured value that records when having shield, dB μ V/m.
Another kind method is that the path-loss difference value when having or not shield through calculating obtains shield effectiveness, and method is following:
The shield effectiveness of shield is the poor of calibration value and measured value, is formulated as follows:
SE＝PL
1-PL
2；
In the formula: SE---shield effectiveness, dB;
PL
1---the path loss values of the calibration value that records during unshielded body, dB;
PL
2---the path loss values of the measured value that records when shield is arranged, dB.
Step 309: central controller 101 sends to display module 103 with the running status of shield effectiveness that obtains and shield effectiveness monitoring system, makes user's reading of data.
In shield effectiveness monitoring system operational process; The power supply of power management module 106 real-time managements and monitoring shielding efficacy monitoring system; And monitor data sent to central controller 101, so that central controller 101 is according to the operation and the warning of electric power thus supplied adjustment shield effectiveness monitoring system.
The above is merely the embodiment of invention.Protection scope of the present invention is not limited thereto, and any technician who is familiar with the present technique field is in the technical scope that the present invention discloses, and the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (10)
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 is used to coordinate the normal operation of said radio-frequency module, display module, said user interface, remote communication module, said power management module and said antenna; Under receiving mode; Said central controller is used to receive the numerical data that said radio-frequency module sends; Said numerical data is carried out analyzing and processing; Signal strength difference when having or not shield or the path-loss difference value when having or not shield obtain shield effectiveness, and the running status and the said shield effectiveness of said shield effectiveness monitoring system sent to said display module; Perhaps, under emission mode, said central controller is used to receive the user instruction that said user interface transmits, and said central controller changes said user instruction into firing order and sends to said radio-frequency module;
Radio-frequency module is used to receive the radio-frequency input signals that said antenna transmission is come, and said radio-frequency input signals is amplified and demodulation, makes said radio-frequency input signals change said numerical data into, and said numerical data is sent to said central controller processing; Perhaps, said radio-frequency module is used to receive the firing order that said central controller sends, and said firing order modulation back is generated transmission frequency output signal and sends to said antenna; Said numerical data comprises electric field intensity, magnetic field intensity, voltage, power and the path loss values of said radio-frequency input signals;
User interface is used to import said user instruction, and said user instruction is sent to said central controller;
Power management module is used for the power supply management and the monitoring of said shield effectiveness monitoring system, and monitor data is sent to said central controller;
Antenna is used to receive the said radio-frequency input signals that the monitoring frequency is launched, and said radio-frequency input signals is sent to said radio-frequency module; Perhaps, said antenna is used to launch said frequency output signal.
2. shield effectiveness monitoring system as claimed in claim 1; It is characterized in that: said shield effectiveness monitoring system comprises display module; Said display module is used to receive the data that said central controller is handled, and shows the running status and the shield effectiveness of said shield effectiveness monitoring system.
3. shield effectiveness monitoring system as claimed in claim 1 is characterized in that: said shield effectiveness monitoring system comprises said remote communication module, and said remote communication module is used to realize telecommunication.
4. shield effectiveness monitoring system as claimed in claim 1 is characterized in that: said radio-frequency module comprises antennal interface, input and output matching circuit and transceiver; Said transceiver comprises receiver and generator; Said receiver comprises attenuator, low noise amplifier, frequency mixer, intermediate frequency amplifier, detuner and demoder; Said transmitter comprises power amplifier and frequency synthesizer; Said frequency synthesizer comprises crystal oscillator, phase detector, charge pump, voltage controlled oscillator and frequency divider; Wherein,
Attenuator is used to adjust the intensity of said radio-frequency input signals, is sent to said low noise amplifier; Be used to adjust the intensity of said frequency output signal, be sent to said antenna;
Low noise amplifier is used to amplify said radio-frequency input signals, is sent to said frequency mixer;
Frequency mixer is used for said radio-frequency input signals and said local oscillation signal after amplifying are transformed to intermediate-freuqncy signal, is sent to said intermediate frequency amplifier;
Intermediate frequency amplifier is used for said intermediate-freuqncy signal is amplified and filtering, is sent to said detuner;
Detuner is used for process amplification and filtered said intermediate-freuqncy signal are transformed to said numerical data, is sent to said central controller;
Demoder is used for receiving said firing order from said central controller, and said firing order is transformed to said frequency output signal, is sent to said power amplifier;
Frequency synthesizer is used to produce said local oscillation signal, is sent to said frequency mixer or said power amplifier;
Power amplifier is used for said frequency output signal and said local oscillation signal are amplified, and outputs to said attenuator or said antenna.
5. like the arbitrary described shield effectiveness monitoring system of claim 1-4, it is characterized in that: the frequency that transmits and receives of said radio-frequency module selects frequency between 400MHz～6GHz as the monitoring frequency.
6. shield effectiveness monitoring method comprises:
Central controller is coordinated the normal operation of radio-frequency module, display module, user interface, remote communication module, power management module and antenna; Under receiving mode; Said central controller receives the numerical data that said radio-frequency module sends; Said numerical data is carried out analyzing and processing; Signal strength difference when having or not shield or the path-loss difference value when having or not shield obtain shield effectiveness, and the running status and the said shield effectiveness of said shield effectiveness monitoring system sent to said display module; Perhaps, under emission mode, said central controller receives the user instruction that said user interface transmits, and said central controller changes said user instruction into firing order and sends to said radio-frequency module;
Radio-frequency module receives the radio-frequency input signals that said antenna transmission is come, and said radio-frequency input signals is amplified and demodulation, makes said radio-frequency input signals change said numerical data into, and said numerical data is sent to said central controller processing; Perhaps, said radio-frequency module receives the firing order that said central controller sends, and said firing order modulation back is generated transmission frequency output signal and sends to said antenna; Said numerical data comprises electric field intensity, magnetic field intensity, voltage, power and the path loss values of said radio-frequency input signals;
User interface receives said user instruction, and said user instruction is sent to said central controller;
The power supply management and the monitoring of the said shield effectiveness monitoring system of power management module, and monitor data sent to said central controller;
Antenna receives the said radio-frequency input signals of monitoring frequency emission, and said radio-frequency input signals is sent to said radio-frequency module; Perhaps, when the launch monitor frequency, said antenna is launched said frequency output signal.
7. shield effectiveness monitoring method as claimed in claim 6 is characterized in that: said display module receives the data that said central controller is handled, and shows the running status and the shield effectiveness of said shield effectiveness monitoring system.
8. shield effectiveness monitoring method as claimed in claim 6 is characterized in that: import said user instruction through said remote communication module.
9. shield effectiveness monitoring method as claimed in claim 6 is characterized in that: said radio-frequency module comprises antennal interface, input and output matching circuit and transceiver; Said transceiver comprises receiver and generator; Said receiver comprises attenuator, low noise amplifier, frequency mixer, intermediate frequency amplifier, detuner and demoder; Said transmitter comprises power amplifier and frequency synthesizer; Said frequency synthesizer comprises crystal oscillator, phase detector, charge pump, voltage controlled oscillator and frequency divider; Wherein,
Attenuator is adjusted the intensity of said radio-frequency input signals, is sent to said low noise amplifier; Adjust the intensity of said frequency output signal, be sent to said antenna;
Low noise amplifier amplifies said radio-frequency input signals, is sent to said frequency mixer;
Said radio-frequency input signals and said local oscillation signal after frequency mixer will amplify are transformed to intermediate-freuqncy signal, are sent to said intermediate frequency amplifier;
Intermediate frequency amplifier amplifies said intermediate-freuqncy signal and filtering, is sent to said detuner;
Detuner will pass through amplification and filtered said intermediate-freuqncy signal is transformed to said numerical data, be sent to said central controller;
Demoder receives said firing order from said central controller, and said firing order is transformed to said frequency output signal, is sent to said power amplifier;
Frequency synthesizer produces said local oscillation signal, is sent to said frequency mixer or said power amplifier;
Power amplifier amplifies said frequency output signal and said local oscillation signal, outputs to said attenuator or said antenna.
10. like the arbitrary described shield effectiveness monitoring method of claim 6-9, it is characterized in that: the frequency that transmits and receives of said radio-frequency module selects frequency between 400MHz～6GHz as the monitoring frequency.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109884407A (en) * | 2019-03-28 | 2019-06-14 | 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）） | Electromagnet shield effect measuring system and measurement method |
| CN110311749A (en) * | 2019-07-04 | 2019-10-08 | 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 |
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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 |
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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 |
| CN113691274A (en) * | 2021-09-07 | 2021-11-23 | 芯朴科技(上海)有限公司 | Radio frequency front end module with shielding case and shielding test method thereof |
| CN116165446A (en) * | 2023-01-03 | 2023-05-26 | 广州力赛计量检测有限公司 | Electromagnetic wave signal management system and method for anechoic chamber |
| 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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