CN105450328A - Distributed mobile phone signal shielding device - Google Patents
Distributed mobile phone signal shielding device Download PDFInfo
- Publication number
- CN105450328A CN105450328A CN201610007816.6A CN201610007816A CN105450328A CN 105450328 A CN105450328 A CN 105450328A CN 201610007816 A CN201610007816 A CN 201610007816A CN 105450328 A CN105450328 A CN 105450328A
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- CN
- China
- Prior art keywords
- condition code
- shielding device
- phone signal
- signal
- mobile phone
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/40—Jamming having variable characteristics
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/40—Jamming having variable characteristics
- H04K3/44—Jamming having variable characteristics characterized by the control of the jamming waveform or modulation type
Abstract
The invention relates to a distributed mobile phone signal shielding device. The distributed mobile phone signal shielding device comprises: an input end of a receiving channel is used for receiving mobile phone signals or suppression signals, the first output end of the receiving channel is connected with the input end of an envelope demodulation module, the output end of the envelope demodulation module is connected with the input end of a feature code monitoring module, the output end of the feature code monitoring module is connected with a master controller, the second output end of the receiving channel is connected with the first input end of an emission channel and the master controller, the second input end of the emission channel is connected with the output end of the feature code modulation module, the input end of the feature code modulation module is connected with the output end of an interference signal source module, and the emission channel outputs the suppression signals. By using the distributed mobile phone signal shielding device of such a structure, the problem of excitation between devices is solved, an infinite space scope can be effectively covered, through distributed arrangement, a shielding blind area can be effectively eliminated, and the shielding effect is improved.
Description
Technical field
The present invention relates to the communications field, particularly relate to mobile phone, specifically refer to a kind of distributed cellular phone signal shielding device.
Background technology
Refer to shown in Fig. 1, the basic functional principle figure for cellular phone signal shielding device of the prior art: monitor handset emissions frequency range, start interference signal when detecting the signal exceeding setting threshold and it is suppressed.
, there is such defect in these products: the restriction being subject to transmitting power, and effective compacting scope of single device only has about 20m, needs to use multiple stage when needing the space of shielding larger simultaneously.In such a scenario, when wherein (or multiple stage) detecting signal and when starting to suppress, because interference signal and mobile phone signal are in same frequency range, miscellaneous equipment can detect throttle signal and start compacting.This phase mutual excitation, can make all devices continue compacting and go down.
Summary of the invention
The object of the invention is the shortcoming overcoming above-mentioned prior art, provide a kind of distributed cellular phone signal shielding device solving mutual inspiration problem between equipment, effectively can cover infinitely-great spatial dimension, effectively eliminate shielding blind area, improve shield effectiveness.
To achieve these goals, distributed cellular phone signal shielding device of the present invention has following formation:
This distributed cellular phone signal shielding device, its main feature is, described shielding device comprises receive path, envelope detection module, condition code monitoring modular, main controller, transmission channel, condition code modulation module and interference signal source, the input of described receive path is in order to receive mobile phone signal or throttle signal, first output of described receive path is connected with the input of described envelope detection module, the output of described envelope detection module is connected with the input of described condition code monitoring modular, the output of described condition code monitoring modular is connected with described main controller, second output of described receive path is connected with the first input end of described transmission channel and described main controller, second input of described transmission channel is connected with the output of described condition code modulation module, the input of described condition code modulation module is connected with the output of described interference signal source module, described transmission channel exports throttle signal.
Further, described condition code modulation module comprises:
Condition code plug-in unit, in order to be inserted in the throttle signal in described transmission channel by the condition code of generation, its insertion cycle is 0.01 ~ 0.5 times of the scan period of described transmission channel;
Condition code generation unit, the pattern being 10KHz in order to generated code speed is the fixed value NRZ code of 30bit length.
Further, the pattern of the condition code that described condition code generation unit generates to be the bit rate comprising seeker be 10KHz is the fixed value NRZ code of 30bit length.
Further, described condition code monitoring modular comprises:
Dynamic threshold judging unit, in order to be separated described mobile phone signal and described throttle signal;
Monitoring means, in order to verify the condition code in described throttle signal, to adjust the threshold value of described dynamic threshold judging unit.
Further, described dynamic threshold judging unit is a low pass filter, and the cut-off frequency of described low pass filter is the half of the bit rate of described condition code.
Further, the interference signal source of described main controller in order to open according to the difference dV of described mobile phone signal and described throttle signal or described in closedown.
Have employed the distributed cellular phone signal shielding device in this invention, compared with prior art, there is following useful technique effect:
1, solve the mutual inspiration problem between equipment, can effectively cover infinitely-great spatial dimension.
2, by distributed arrangement, effectively can eliminate shielding blind area, improve shield effectiveness.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of cellular phone signal shielding device of the prior art.
Fig. 2 is the schematic diagram of distributed cellular phone signal shielding device of the present invention.
Fig. 3 is the schematic diagram of condition code frame structure of the present invention.
Fig. 4 is the output waveform figure comprising detection module of the present invention.
Embodiment
In order to more clearly describe technology contents of the present invention, conduct further description below in conjunction with specific embodiment.
Refer to shown in Fig. 2 to Fig. 4, the present invention, can mutual inspiration problem between solution equipment by identification to feature throttle signal; The operation principle of distributed cellular phone signal shielding device as shown in Figure 2, after the envelope detection and interference signal source of existing type, inserts condition code monitoring and modulation module respectively.Like this, by rational design feature code and modulation, monitoring modular, the distributed signal interference unit without autoexcitation phenomenon can all be realized.
1, condition code, refers to shown in Fig. 3:
A, modulation system: in view of system uses envelope detection mode, condition code is suitable for amplitude modulation(PAM) mode.
B, cycle: for guaranteeing detecting of condition code, within each Channel scan cycle, at least need insert a condition code.Meanwhile, ensure effective suppressing power, the insertion of condition code will be lacked as far as possible.Therefore the insertion cycle of condition code get 1/2 ~ 1/10 of the Channel scan cycle, comprise two end points 1/2 and 1/10.
C, bit rate: the bit rate of condition code is determined by the speed of response of envelope detector, and namely envelope detection unit clearly can detect the modulation waveform of condition code.Meanwhile, consider guarantee suppressing power, the bit rate of condition code should be not too low yet.In general, the desirable 10KHz of condition code speed.
D, pattern: the fixed value NRZ code getting 30bit length.
E, the method for synchronization: as Fig. 3, condition code is a bit of data be inserted in lasting throttle signal.Can realize synchronous by the seeker of interpolation one segment length 0 long 1.
2, condition code monitoring modular:
A, throttle signal are separated with mobile phone signal: when mobile phone signal and throttle signal exist simultaneously, and the output of envelope detector is as shown in the curve 1 in Fig. 4.Throttle signal is separated with mobile phone signal by dynamic conditioning decision threshold by condition code monitoring modular.
Dynamic decision threshold can be realized by a low pass filter, and the cut-off frequency of this filter is the half of condition code speed.
When the difference dV of the throttle signal that condition code monitoring modular detects and mobile phone signal is less, there is other throttle signal even if illustrate, also do not reach good shield effectiveness.Now can think and effectively not disturb, interference signal source also starts compacting.After mobile phone signal disappears, dV value will increase, and other interference source will be detected, and interference signal source stops interference.
B, condition code verify: the signal through dynamic threshold judgement is yuan code of 2 shown in Fig. 3, using seeker as synchronous triggering, just can detect and calibration feature code.The fault-tolerant threshold value of suitable adjustment feature code element, can the sensitivity of adjustment System.
C, condition code detect condition:
Be not difficult to find out, probability of false detection sharply reduces with the increase of the code element sum when condition code, and when condition code length is 30, probability of false detection can be ignored.And false dismissal probability is by the impact of two factors, one is reliably detecting of synchronous head, and the quantity being connected 0,1 by the length suitably chosen in seeker is controlled.Two is the verification intensity of condition code, can be adjusted by the fault-tolerant amount of adjustment condition code verification.
Meanwhile, insert quantity by the condition code increased in each scan period, also effectively can reduce false dismissal probability.
3, condition code modulation module:
Because the chip rate of condition code is very low, modulate relatively simple.Doubly regularly insert according to the 2-10 of channel rate.
Have employed the distributed cellular phone signal shielding device in this invention, compared with prior art, there is following useful technique effect:
1, solve the mutual inspiration problem between equipment, can effectively cover infinitely-great spatial dimension.
2, by distributed arrangement, effectively can eliminate shielding blind area, improve shield effectiveness.
In this description, the present invention is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (6)
1. a distributed cellular phone signal shielding device, is characterized in that, described shielding device comprises receive path, envelope detection module, condition code monitoring modular, main controller, transmission channel, condition code modulation module and interference signal source, the input of described receive path is in order to receive mobile phone signal or throttle signal, first output of described receive path is connected with the input of described envelope detection module, the output of described envelope detection module is connected with the input of described condition code monitoring modular, the output of described condition code monitoring modular is connected with described main controller, second output of described receive path is connected with the first input end of described transmission channel and described main controller, second input of described transmission channel is connected with the output of described condition code modulation module, the input of described condition code modulation module is connected with the output of described interference signal source module, described transmission channel exports throttle signal.
2. distributed cellular phone signal shielding device according to claim 1, is characterized in that, described condition code modulation module comprises:
Condition code plug-in unit, in order to be inserted in the throttle signal in described transmission channel by the condition code of generation, its insertion cycle is 0.01 ~ 0.5 times of the scan period of described transmission channel;
Condition code generation unit, the pattern being 10KHz in order to generated code speed is the fixed value NRZ code of 30bit length.
3. distributed cellular phone signal shielding device according to claim 2, is characterized in that, the pattern of the condition code that described condition code generation unit generates to be the bit rate comprising seeker be 10KHz is the fixed value NRZ code of 30bit length.
4. distributed cellular phone signal shielding device according to claim 1, is characterized in that, described condition code monitoring modular comprises:
Dynamic threshold judging unit, in order to be separated described mobile phone signal and described throttle signal;
Monitoring means, in order to verify the condition code in described throttle signal, to adjust the threshold value of described dynamic threshold judging unit.
5. distributed cellular phone signal shielding device according to claim 4, is characterized in that, described dynamic threshold judging unit is a low pass filter, and the cut-off frequency of described low pass filter is the half of the bit rate of described condition code.
6. distributed cellular phone signal shielding device according to claim 4, is characterized in that, the interference signal source of described main controller in order to open according to the difference dV of described mobile phone signal and described throttle signal or described in closedown.
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| CN201610007816.6A CN105450328B (en) | 2016-01-06 | 2016-01-06 | Distributed cellular phone signal shielding device |
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| CN201610007816.6A CN105450328B (en) | 2016-01-06 | 2016-01-06 | Distributed cellular phone signal shielding device |
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| CN105450328B CN105450328B (en) | 2018-11-27 |
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| CN102106091A (en) * | 2008-07-31 | 2011-06-22 | 高通股份有限公司 | Method and apparatus for providing jammer detection in a receiver |
| CN203166946U (en) * | 2013-04-02 | 2013-08-28 | 陕西天基通信科技有限责任公司 | TD-SCDMA/TD-LTE downlink shielding device |
| CN104539386A (en) * | 2014-12-26 | 2015-04-22 | 成都杰联祺业电子有限责任公司 | Interconnected type full-band signal shielding device, system and method |
| CN105207737A (en) * | 2014-06-30 | 2015-12-30 | 南京索弗威信息技术有限公司 | Mobile phone signal shielding platform based on active interference and active shielding forming one body |
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2016
- 2016-01-06 CN CN201610007816.6A patent/CN105450328B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006140976A (en) * | 2004-11-15 | 2006-06-01 | Maruhama:Kk | Call interference device and microwave detection apparatus |
| CN102106091A (en) * | 2008-07-31 | 2011-06-22 | 高通股份有限公司 | Method and apparatus for providing jammer detection in a receiver |
| CN201590813U (en) * | 2009-12-09 | 2010-09-22 | 长春大学 | Mobile phone signal sensing shielding device with monitored information display function |
| CN203166946U (en) * | 2013-04-02 | 2013-08-28 | 陕西天基通信科技有限责任公司 | TD-SCDMA/TD-LTE downlink shielding device |
| CN105207737A (en) * | 2014-06-30 | 2015-12-30 | 南京索弗威信息技术有限公司 | Mobile phone signal shielding platform based on active interference and active shielding forming one body |
| CN104539386A (en) * | 2014-12-26 | 2015-04-22 | 成都杰联祺业电子有限责任公司 | Interconnected type full-band signal shielding device, system and method |
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Address after: Block C, No. 7, Lane 205, Gaoji Road, Songjiang District, Shanghai, 201601 Patentee after: Chuangyuan Xinke (Shanghai) Technology Co.,Ltd. Address before: 4th Floor, Building 28, No. 69, Guiqing Road, Xuhui District, Shanghai, 200233 Patentee before: TRANSCOM INSTRUMENTS Co.,Ltd. |