CN108737015A - A kind of screen method and system of GSM mobile handset signal - Google Patents
A kind of screen method and system of GSM mobile handset signal Download PDFInfo
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- CN108737015A CN108737015A CN201810855581.5A CN201810855581A CN108737015A CN 108737015 A CN108737015 A CN 108737015A CN 201810855581 A CN201810855581 A CN 201810855581A CN 108737015 A CN108737015 A CN 108737015A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/60—Jamming involving special techniques
- H04K3/62—Jamming involving special techniques by exposing communication, processing or storing systems to electromagnetic wave radiation, e.g. causing disturbance, disruption or damage of electronic circuits, or causing external injection of faults in the information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a kind of screen method and system of GSM mobile handset signal, interference handset upstream frequency is used to realize shielding.Using the characteristic of at least one ascending time slot period of the uplink signal of handset emissions, detection identifies whether the uplink signal strength reaches the level threshold of setting within the ascending time slot period, and judges whether this transmitting mobile phone is located in shielding area accordingly；For the mobile phone for being judged to being located in shielding area, emit the shielding interference signal with time slot, so that the intensity of the interference signal is more than the intensity of the uplink signal of handset emissions, with the reception of interference base station, to interrupt the communication of mobile phone.A kind of GSM mobile handset signal shielding system, including uplink receiving antenna, filter, power detection comparator, jamming transmitter and uplink interference antenna.Using method and system provided by the invention, GSM mobile handset signal is implemented not interfere with other users in region when shielding, and do not have not emit when mobile phone use, reduce waste, reduce wireless signal pollution.
Description
Technical field
The present invention relates to the shielding field of mobile communication, the mainly a kind of screen method and system of GSM mobile handset signal.
Background technology
Shielding for GSM mobile handset is mostly to use interference downstream frequency to realize shielding, common are such as sweep-frequency Békésy audiometer screen
Device, white noise interference type shielding device are covered, also sweep-frequency Békésy audiometer shielding device or white noise interference type shields device and determine frequency type interference unit
The combined type that combination is formed determine frequency type interference unit, wherein when being directed to strong base station signal, it usually can also nearby strongest several bases
The several frequency points of selection of standing reinforce interference namely the interference of N point frequency types.By taking same frequency band signals as an example, there are two operator base station,
Such as the base station of an operator from closely, signal it is strong, the base station of another operator far away, signal it is weak, then shielding
Intensity will be arranged by the strongest base station of signal, then for the base station of weak signal, because shielding is by strongest base station
Come what is be arranged, shielding at this time is too strong for weak signal base station, that is to say that shielding area is big, and weak signal base station is caused to be transported
The shielding area of quotient's covering is sought beyond requirement, is caused beyond user's difficult communication in shielding area requirement, to cause user
Complain etc..
The patent of publication No. CN103607254B discloses a kind of self-interference formula shielding device, to including the various of GSM standards
Standard mobile phone signal is all suitable for, and the technology used is：Local transceiver antenna receives and stores downlink air signal, and according to one
Set pattern then sends the signal, and is larger than original signal to realize effectively shielding.But the technology has the following problems：In view of
The characteristic of GSM, bcch carrier continuously emit, and TCH carrier waves emit on demand, therefore the patented technology is to bcch carrier
Shielding be complete, but due to TCH carrier waves receive time slot have randomness, can not ensure TCH carrier waves can get user transmitting
Time slot receives shielding when TCH carrier waves have transmitting and normally, also non-emissive is shielded when receiving TCH carrier wave non-emissives, at this moment
Shielding is because the TCH carrier wave non-emissives make the shielding to the TCH carrier waves invalid, so the shielding of TCH carrier waves is lacked.
Invention content
It is an object of the invention to overcome the shortcomings of the prior art, implemented by the uplink signal to GSM mobile handset dry
It disturbs to realize the shielding to GSM mobile handset signal, due to the interference of no downlink signal, it can be achieved that clean shielding area, does not interfere with
Other users；Do not emit when not having mobile phone use in addition, reduce waste, reduces wireless signal pollution.
The purpose of the present invention is by following technical solution to complete.A kind of screen method of GSM mobile handset signal, the party
Method includes the following steps：
(1) all upstream frequencies in shielding area are monitored, the uplink signal of GSM mobile handset is captured；
(2) characteristic for utilizing at least one ascending time slot period of the uplink signal of handset emissions, in the ascending time slot
Detection identifies whether the uplink signal strength reaches the power level thresholding of setting in section, and whether judges this transmitting mobile phone accordingly
In shielding area；
(3) for the mobile phone for being judged to being located in shielding area, emit the shielding interference signal with time slot, the interference is made to believe
Number intensity be more than handset emissions uplink signal intensity, with the reception of interference base station, to interrupt the communication of mobile phone.
The downstream frequency of interference GSM mobile handset is mostly used in the prior art to realize shielding, the subversive use of the present invention
Interfere the upstream frequency of GSM mobile handset to achieve the purpose that shielding.Since interference is to be directed to separate unit mobile phone, shielding is only detected
When having GSM mobile handset transmitting in region, just transmitting is interfered with the shielding of time slot.By using handset emissions uplink signal at least
One the ascending time slot period this characteristic, due to the power of GSM ascending time slots be in entire slot length it is substantially invariable, because
This power that need to detect the time slot previous section time can be considered the power level of the time slot, and identification decision accordingly
Whether the mobile phone is located in shielding area, for being determined as the mobile phone positioned at shielding area, then in the slot length remaining time
Transmitting is received with time slot interference with reaching interference base station, to realize the purpose of shielding mobile phone.Since the base stations GSM are used for each mobile phone
Independent ascending time slot is distributed at family, therefore for the base stations GSM, the interference that the present invention is implemented in the ascending time slot period will not shadow
Ring the normal communication to other mobile phone users.The present invention realizes no unwanted emission, effectively reduces energy waste, reduces dirt
Dye.
It should also be noted that, traditional shield technology mostly uses the mode of shielding downlink signal to implement to shield to GSM mobile handset
The case where covering, RF hopping technology is used for base station needs to shield the frequency point that all TCH carrier waves participate in frequency hopping simultaneously, and TCH
The frequency point quantity that carrier wave participates in frequency hopping is more, generally up to 10 or more, therefore needs to consume prodigious power.And it is provided by the invention
Technology is not affected by this then, since this technology is to all uplink signals all implementing monitorings in entire shielding area, no matter
Whether base station uses RF hopping technology, this system that can implement to capture.For using RF hopping, this technology and shielding
The real-time number of timeslots of mobile phone user's emission time is related in region, such as：If slot transmission there are two in the same time,
Only send out the corresponding frequency point of the two time slots, next time slot can according to the detection of the transmitting signal of mobile phone and real-time tracking is respectively jumped
Another two frequency point corresponding to frequency sequence, but the launching frequency number needed or two, i.e., two real-time TCH carrier waves, there is no need to
Prodigious power is consumed, energy waste and the Communication Jamming to normal users are reduced.
The present invention can also further limit and perfect by the following technical programs：
As a kind of technical solution, before transmitting is with the shielding interference signal of time slot, the uplink letter to handset emissions is also needed
Number in shielding area other shielding interference signals implement screen；To being determined as mobile phone signal, further detection identification should
Whether uplink signal strength reaches the power level thresholding of setting；To being determined as other shielding interference signals, stop in next step
Action.In the case of shield ranges are larger, it usually needs arrange more shielding devices in shielding area so that entire area
Domain all have preferable shield effectiveness, it is therefore desirable to in the uplink signal and shielding area of the handset emissions in shielding area its
The interference signal that he shields device transmitting is screened.To being determined as mobile phone signal, further transmitting is dry with the shielding of time slot
Disturb signal；To being determined as other shielding interference signals, stop the shielding transmitting of next step.
As a kind of technical solution, the ascending time slot period of the handset emissions includes recognition detection period and shielding hair
Penetrate the period；The recognition detection period is used to detect the power level thresholding for identifying whether the uplink signal strength reaches setting,
It is more than setting power level thresholding to uplink signal strength, emits the shielding interference signal with time slot in shielding emission period,
And the intensity of the interference signal is made to cut off the hands in the reception of interference base station more than the intensity of the uplink signal of handset emissions
The communication of machine.For the smaller occasion of shielding area, separate unit shielding can cover entire shielding area namely entire shielding area
Interior only single shielding transmitting signal, there is no need to discriminate whether that also other shielding devices have issued shielding transmitting signal, this
It only needs the uplink signal strength by handset emissions to differentiate whether it is located in shielding area in the case of kind, and it is implemented to shield
It covers.
As a kind of technical solution, when shielding interference signal there is also other in shielding area, the recognition detection period
Other shielding interference signals being additionally operable in the uplink signal and shielding area of screening handset emissions, to being determined as handset emissions
Uplink signal further detects the power level thresholding whether uplink signal strength reaches setting, super to uplink signal strength
Setting level threshold is crossed, in the transmitting of shielding emission period with the shielding interference signal of time slot, and makes the intensity of the interference signal
More than the intensity of the uplink signal of handset emissions, with the reception of interference base station, to interrupt the communication of mobile phone.
As a kind of technical solution, in shielding area, the tranmitting frequency of the adjacent each shielding interference signal of physics is different.
When the more shielding devices for emitting co-channel interference signal work to expand shielding area together, it is understood that there may be following problem：It is more
Platform shielding device is detected simultaneously by the transmitting of the same mobile phone and transmits shielding interference signal, these homogenous frequency signals may be due to arriving
Become there are the time difference that success rate is close, opposite in phase at up to reception antenna, it is superposed on one another and offset, to cause base station to receive
Shielding transmitting signal not enough cause by force shielding fail.Therefore setting when, shielding device transmitting signal frequency with nearby
Equipment answer difference, i.e., the interference signal of transmitting is grouped, physics is adjacent, the tranmitting frequency of each self-interference signal
Difference, physics here is adjacent to refer to that installation site is neighbouring, is arranged is detected at the same time with evading adjacent shields device in this way
The problem of emitting the inversely adding at receiver of co-channel interference signal to same mobile phone causes to offset；Similarly can also
Prevent the shielding transmitting detection of shielding device from receiving because with the problem of causing to inversely add and offset frequently.
As a kind of technical solution, using ascending time slot coaching method：Before transmitting is with the shielding interference signal of time slot, obtain
The boundary of time slot and slot length of the uplink of mobile phone up-link carrier, the boundary of time slot include time slot beginning boundary and time slot knot
Beam boundary, the boundary of time slot and slot length of uplink constitute the ascending time slot period.It, can be in order to accurately obtain boundary of time slot
Using ascending time slot coaching method, the boundary of time slot and time slot length of mobile phone up-link carrier, boundary of time slot here are obtained
Including time slot beginning boundary and time slot end boundary.Special, when only having one to need the mobile phone shielded in shielding area, first
It is not turned on shielding, uplink signal is only received and obtains the upper of the carrier wave after completely receiving one or more time slot signal
Capable boundary of time slot, that is, obtain training base station 1, then after mobile phone emits uplink signal again by time slot beginning boundary with
After time slot trains base station 1 to synchronize alignment judgement, open that timeslot power-levels differentiate and that shielding is opened after reaching power level is real
Apply interference.Non-alignment time slot trains the beginning boundary of base station 1, is abandoned, for there may be more need in shielding area
The case where mobile phone to be shielded, since these mobile phones may be respectively connected to different base stations, when so as to cause these mobile phone uplinks
The boundary of gap is possibly can not be perfectly aligned, namely there are certain offset, for details, reference can be made to Fig. 1；Boundary of time slot is misaligned
The case where, it needs to open the training of another ascending time slot, obtains the boundary of time slot (such as training base station 2) of another base station, method
Ibid, analogize, then similarly by synchronize be aligned beginning boundary after just enter next step shielding emit, can filter in this way
Except the random radio frequency interference of the upstream frequency of some non-handset emissions (has been trained (1~base of base station because only that being aligned
Stand M) time slot beginning boundary radiofrequency signal could enter shielding differentiate startup program), reduce the upper line frequency of non-handset emissions
The random radio frequency interference of rate and corresponding misjudgement and the influence of shielding transmitting emitted, and reduce interference to base station.
Preferably, shielding corresponds to the mobile phone under each base station in order in ascending time slot coaching method, instructed based on time slot
Practice base station 1, trains base station time slot cycle period using time slot, first the mobile phone under a base station has all been shielded, then look for again another
The time slot cycle of training of the corresponding mobile phone in one base station, so repeat to shield in order under all different base stations in shielding area
Interior all mobile phones.It should be noted that when general shielding transmitting interference, unless transmitting antenna far from shielding device, otherwise
There is larger obstruction interference for the mobile phone uplink receiving circuit of same frequency range；So considering to close simultaneously in shielding transmitting interference
The reception for closing mobile phone uplink signal thereby results in the temporal discontinuous of receiving circuit and causes bad shadow to reception processing
It rings, the reading as influenced the ascending time slot boundary during shielding transmitting interference；Institute between all mobile phones under a base station
The uplink signal of transmitting be time slot alignment, namely shielding transmitting close after just again be next time slot beginning；Therefore this hair
All mobile phones in the shielding device shield ranges under the bright same base station of shielding that can not be omitted.Base station is trained based on time slot
1, the present invention trains base station time slot cycle period using time slot, and first the mobile phone under this base station has all been shielded, that is, has passed through one section
After time shielding so that whole mobile phone off-grids, then by receiving a period of time, verify whether mobile phone in the shielding area all
Off-grid, namely without the handset emissions uplink signal for being aligned base station time slot cycle of training；Then look for another base station corresponding again
It so repeats to shield in order all in shielding device region under all different base stations the time slot cycle of training of mobile phone
Mobile phone.
Preferably, the centre frequency of the interference signal of gap is the center of GSM mobile handset carrier signal while the transmitting
Frequency shift (FS) a certain amount.For example, the centre frequency of the interference signal of gap is the center of GSM mobile handset carrier signal while transmitting
Frequency shift (FS)+60kHz, either+67kHz, also or+74kHz, again or -60kHz, again or -67kHz, again or -
74kHz。
Preferably, GSM hands can be obtained by increasing the diversity receiving technology of diversity reception antenna and diversity reception circuit
The uplink signal of machine.It is received not caused by can effectively being mitigated due to the rapid fading effect of GSM uplink signals using diversity technique
It is good, to increase the stability received.
The present invention also provides a kind of shielding harness of GSM mobile handset signal corresponding with the above method, include mainly uplink
Reception antenna, filter, power detection comparator, jamming transmitter and uplink interference antenna；GSM mobile handset in shielding area
Uplink signal power detection comparator is sent to after filter filtering after uplink receiving antenna trapping, in ascending time slot
Detection identifies whether the uplink signal strength reaches the power level thresholding of setting in section, and judges with this to emit the uplink signal
Mobile phone whether be located at shielding area in；For the mobile phone for being judged to being located in shielding area, power detection comparator sends letter
Number to jamming transmitter notify its emissive porwer be more than handset emissions uplink signal strength while gap interference signal with to this
Mobile phone implements shielding.
As a kind of technical solution, the filter includes carrier wave filter module, and the carrier wave filter module is used for opponent
Machine uplink signal implements filtering；Signal in shielding area passes after uplink receiving antenna trapping after the filtering of carrier wave filter module
It send to power detection comparator to screen whether the signal is mobile phone signal, for being determined as mobile phone signal, detects its signal
Whether intensity reaches the power level thresholding of setting, and judges whether the mobile phone for emitting the uplink signal is located at shielding area with this
It is interior；For the mobile phone for being judged to being located in shielding area, power detection comparator sends a signal to jamming transmitter and notifies its hair
It penetrates same slot interfering signal of time the mobile phone is implemented to shield.
As another technical solution, the filter further includes shielding interference signal filter module, the shielding interference
Signal filter module is used to implement filtering to the signal of other shielding device transmittings in shielding harness；Signal in shielding area is through upper
After the capture of row reception antenna power detection is sent to after carrier wave filter module and shielding interference signal filter module filtering respectively
Comparator, for being determined as mobile phone signal, detects whether its signal strength reaches to screen whether the signal is mobile phone signal
The power level thresholding of setting, and judge whether the mobile phone for emitting the uplink signal is located in shielding area with this；For judgement
For the mobile phone in shielding area, power detection comparator sends a signal to jamming transmitter and it is notified to emit same time slot interference
Signal is implemented to shield to the mobile phone.
In both the above technical solution, power detection comparator can pass through other shieldings in mobile phone signal and shielding area
The difference of the signal characteristic of device identified, such as frequency spectrum, centre frequency difference characteristic；Different bandwidth and center can be passed through
The poor another characteristic of the power of the output of the corresponding filter of frequency is screened to detect, since shielding transmitting signal power all exists
In the corresponding shielding filter band according to the setting of shielded signal feature, interference signal is shielded when there are other shielding devices to emit, and
When there is no handset emissions signal, detected after the detected power and shielding filter of carrier filter as a comparison
It obtains that power is essentially identical, so if the power that shielding filter obtains is essentially identical, is considered to shield the letter of device transmitting
Number；, whereas if the power of the GSM signals of handset emissions is distributed in GSM carrier bandwidths, shielding filter is because only that GSM
For the fractional bandwidth of carrier filter so obtained power is Partial Power, i.e., the power that GSM filters obtain is big many,
Then it is considered mobile phone uplink signal, according to above difference, emits signal to screen out shielding device to prevent more shielding devices
Between it is mutual lifting and self-excitation.
As a kind of technical solution, the operating center frequency of the carrier wave filter module and shielding interference signal filter module
It differs, and bandwidth is also different.Preferably, the bandwidth of carrier wave filter module is 200kHz, interference signal filter module is shielded
Bandwidth be 20kHz.
Preferably, uplink interference transmitter transmitting interference signal centre frequency be carrier signal centre frequency it is inclined
Move a certain amount.As possible close to the judgement frequency of the corresponding receiving circuit of correlation of the modulation variation corresponding to symbol saltus step, use
Come increase to mobile phone decode anti-jamming circuit harassing and wrecking, to increase shielding power efficiency.For example, the transmitting of uplink interference transmitter
The centre frequency of interference signal be carrier signal carrier deviation+60kHz, either+67kHz, also or+74kHz, again or
Person -60kHz, again either -67kHz, again or -74kHz.
In conclusion the present invention utilizes this spy of at least one ascending time slot period of uplink signal of GSM mobile handset transmitting
Property, after identified judgement mobile phone is located in shielding area, emit the interference signal with time slot with uplink signal, with realization pair
The shielding of GSM mobile handset communication does not interfere with the normal communication of other users in the interference that the ascending time slot is implemented, realizes not
There is unwanted emission, effectively reduces energy waste, reduces pollution.
Description of the drawings
Fig. 1 is the difference schematic diagram for the uplink transmission time slot that different base station corresponds to GSM mobile handset；
Fig. 2 is the schematic diagram of time slot shielding principle of the present invention in embodiment 1.
Fig. 3 is the distribution schematic diagram of slot period in embodiment 1；
Fig. 4 is the structural schematic diagram of shielding harness of the present invention in embodiment 2；
Fig. 5 is the structural schematic diagram of another shielding harness of the invention in embodiment 3；
Fig. 6 is the operation principle logic chart of power detection comparator in embodiment 3；
When Fig. 7 is that shielding transmitting with slot interfering signal of time is positive frequency in embodiment 3, carrier wave filter module and shielding are interfered
The bandwidth of operation of signal filter module and the position view of centre frequency.
Specific implementation mode
Embodiment 1
Detailed introduction is done to the present invention below in conjunction with drawings and examples：As shown in Fig. 2, the invention discloses one kind
The screen method of GSM mobile handset signal, this method comprises the following steps：
(1) all upstream frequencies in shielding area are monitored, the uplink signal of GSM mobile handset is captured；
(2) characteristic for utilizing at least one ascending time slot period of the uplink signal of handset emissions, in the ascending time slot
Detection identifies whether the uplink signal strength reaches the power level thresholding of setting in section, and whether judges this transmitting mobile phone accordingly
In shielding area；
(3) for the mobile phone for being judged to being located in shielding area, emit the shielding interference signal with time slot, the interference is made to believe
Number intensity be more than handset emissions uplink signal intensity, with the reception of interference base station, to interrupt the communication of mobile phone.
The downstream frequency of interference GSM mobile handset is mostly used in the prior art to realize shielding, the subversive use of the present invention
Interfere the upstream frequency of GSM mobile handset to achieve the purpose that shielding.Since interference is to be directed to separate unit mobile phone, shielding is only detected
When having GSM mobile handset transmitting in region, just transmitting is interfered with the shielding of time slot.By using handset emissions uplink signal at least
One the ascending time slot period this characteristic, due to the power of GSM ascending time slots be in entire slot length it is substantially invariable, because
This power that need to detect the time slot previous section time can be considered the power level of the time slot, and identification decision accordingly
Whether the mobile phone is located in shielding area, for being located at the mobile phone of shielding area after differentiation, then in the slot length remaining time
Transmitting is received with time slot interference with reaching interference base station, to realize the purpose of shielding mobile phone.Since the base stations GSM are used for each mobile phone
Independent ascending time slot is distributed at family, therefore for the base stations GSM, the interference that the present invention is implemented in the ascending time slot period will not shadow
Ring the normal communication to other mobile phone users.The present invention realizes no unwanted emission, effectively reduces energy waste, reduces dirt
Dye.
Before transmitting is with the shielding interference signal of time slot, using ascending time slot coaching method, the upper of mobile phone up-link carrier is obtained
Capable boundary of time slot and slot length, the boundary of time slot include time slot beginning boundary and time slot end boundary, uplink when
Gap boundary and slot length constitute the ascending time slot period.Special, need the hand shielded when there was only one in shielding area
Machine is first not turned on shielding, only receives uplink signal and obtains the load after completely receiving one or more time slot signal
The boundary of time slot of the uplink of wave obtains training base station 1, then after mobile phone emits uplink signal by being aligned identification correctly again
Implement to interfere again after opening time slot level relatively.The case where for needing the mobile phone shielded there may be more in shielding area,
It, can not be complete so as to cause boundary possibly of these mobile phone ascending time slots since these mobile phones may be respectively connected to different base stations
Alignment, namely there are certain offsets；The case where being misaligned for boundary of time slot needs to open the training of another ascending time slot,
The boundary of time slot of another base station is obtained, obtains training base station 2, and give time slot beginning boundary alignment identification correctly by synchronizing
The shielding for just entering next step afterwards emits, and so on, the radio frequency interference pair of non-alignment base station beginning boundary can be filtered out in this way
Shield mobile phone ascending time slot signal recognition system interference and it is corresponding misjudgement and emit shielding transmitting interference.
It should be noted that when general shielding transmitting interference, unless transmitting antenna far from shielding device, otherwise for same frequency
The mobile phone uplink receiving circuit of section has larger obstruction interference；So considering on closing hand phone simultaneously in shielding transmitting interference
The reception of row signal thereby results in the temporal discontinuous of receiving circuit and causes harmful effect to reception processing, such as influences
The reading on the ascending time slot boundary during shielding transmitting interference；The uplink emitted between all mobile phones under a base station
Signal be time slot alignment, namely shielding transmitting close after just again be next time slot beginning；Therefore the present invention can not lose
All mobile phones in the shielding device shield ranges under the same base station of shielding of leakage.Base station 1, present invention profit are trained based on time slot
It trains base station time slot cycle period with time slot, first the mobile phone under this base station has all been shielded, i.e., after being shielded by a period of time,
So that whole mobile phone off-grids, then by receiving a period of time, mobile phone in the shielding area all off-grids, Ye Jiwu are verified whether
It is aligned the handset emissions uplink signal of base station time slot cycle of training；Then the time slot of the corresponding mobile phone in another base station is looked for instruct again
Practice the period, so repeats to shield all mobile phones in shielding device region under all different base stations in order.Such as Fig. 3
Shown, the ascending time slot period of handset emissions includes that detection differentiates period and shielding emission period, wherein recognition detection period
Whether reach the power level thresholding of setting for detecting uplink signal strength；It is more than setting power level to uplink signal strength
Thresholding, in the transmitting of shielding emission period with the shielding interference signal of time slot, and the intensity of the interference signal is made to be sent out more than mobile phone
The intensity for the uplink signal penetrated, with the reception of interference base station, to interrupt the communication of mobile phone.
Embodiment 2
Include mainly uplink receiving day as shown in figure 4, present embodiment discloses a kind of shielding harness of GSM mobile handset signal
Line, filter, power detection comparator, jamming transmitter and uplink interference antenna；Here filter is that carrier wave filters mould
Block.The uplink signal of GSM mobile handset in shielding area is sent to power after uplink receiving antenna trapping after filter filtering
Detection comparator, to detect the power level door for identifying whether the uplink signal strength reaches setting within the ascending time slot period
Limit, and judge whether the mobile phone for emitting the uplink signal is located in shielding area with this；For being judged to being located in shielding area
Mobile phone, power detection comparator send a signal to jamming transmitter notify its emissive porwer be more than handset emissions uplink signal
Gap interference signal to the mobile phone to implement to shield while intensity.
Embodiment 3
As shown in figure 5, elliptical internal is the larger shielding area of a range in figure, in the area, in addition to this shielding
Other than system (dashed box part), device 1, shielding device 2, shielding device 3 and shielding device 4 are also shielded.As different from Example 2, originally
In shielding harness filter include carrier wave filter module and shielding interference signal filter module, wherein carrier wave filter module for pair
Mobile phone uplink signal implements filtering, and shielding interference signal filter module is used for the interference to other shielding device transmittings in shielding area
Signal implements filtering.The wherein operating center frequency of carrier wave filter module and shielding interference signal filter module differs, and band
It is wide also different.
In the case of shield ranges are larger, it usually needs arrange more shielding devices in shielding area so that entire area
Domain all has preferable shield effectiveness, to avoid the mutual lifting of more shielding devices, the wrong shielding that other shielding devices are sent out from doing
Disturb the uplink signal that signal treats as handset emissions, need before transmitting is with the interference signal of frequency to the uplink signals of handset emissions and
The shielding interference signal that other shielding devices are sent out is implemented to screen.Signal in shielding area is distinguished after uplink receiving antenna trapping
It is sent to power detection comparator, power detection after carrier wave filter module and shielding interference signal module filtered in filtered device
Comparator first screens whether the signal is mobile phone signal within the recognition detection period, for being determined as mobile phone signal, then detects
Whether the power level of its ascending time slot reaches the thresholding of setting, and judges whether the mobile phone for emitting the uplink signal is located at this
In shielding area；For the mobile phone for being judged to being located in shielding area, power detection comparator sends a signal to jamming transmitter
Its transmitting is notified to implement to shield to the mobile phone with slot interfering signal of time, it is specific as shown in Figure 6.
When the more shielding devices for emitting co-channel interference signal work to expand shielding area together, it is understood that there may be as follows
Problem：More shielding devices are detected simultaneously by the transmitting of the same mobile phone and transmit shielding interference signal, these homogenous frequency signals can
It can become there are the time difference that success rate is close, opposite in phase at reception antenna due to reaching, it is superposed on one another and offset, to cause base
The shielding transmitting signal that station receives not enough causes by force shielding to be failed.Therefore in setting, the frequency of the signal of shielding device transmitting
Difference is answered with nigh equipment, i.e., the interference signal of transmitting is grouped, physics is adjacent, each self-interference signal
Tranmitting frequency is different, and physics here is adjacent to refer to that installation site is neighbouring, is arranged is existed with evading adjacent shields device in this way
It is detected simultaneously by same mobile phone and emits the problem of the inversely adding at receiver of co-channel interference signal causes to offset；Together
The shielding transmitting detection that reason is also possible to prevent shielding device receives because with the problem of causing to inversely add and offset frequently.
As shown in fig. 7, preferably, the bandwidth of operation of carrier wave filter module is 200kHz, shielding interference signal filters mould
The bandwidth of operation of block is 20kHz.Preferably, the interference signal of uplink interference transmitter transmitting is that the centre frequency of carrier signal is inclined
Move a certain amount.Jamming transmitter transmitting interference signal frequency be centre carrier frequency offset+60kHz, or+67kHz,
Also either+74kHz, again or -60kHz, again or -67kHz, again or -74kH.
Here uplink receiving increases diversity reception antenna and diversity reception circuit, adopts using diversity receiving technology
Reception is bad caused by can effectively being mitigated due to the rapid fading effect of GSM uplink signals with diversity technique, to increase reception
Stability.
It is understood that it will be understood by those skilled in the art that being subject to technical scheme of the present invention and inventive concept
The protection domain of appended claims of the invention should all be belonged to replacement or change.
Claims (14)
1. a kind of screen method of GSM mobile handset signal, it is characterised in that：This method comprises the following steps：
(1) all upstream frequencies in shielding area are monitored, the uplink signal of GSM mobile handset is captured；
(2) characteristic for utilizing at least one ascending time slot period of the uplink signal of handset emissions, within the ascending time slot period
Detection identifies whether the uplink signal strength reaches the power level thresholding of setting, and judges whether this transmitting mobile phone is located at accordingly
In shielding area；
(3) for the mobile phone for being judged to being located in shielding area, emit the shielding interference signal with time slot, make the interference signal
Intensity is more than the intensity of the uplink signal of handset emissions, with the reception of interference base station, to interrupt the communication of mobile phone.
2. the screen method of GSM mobile handset signal according to claim 1, which is characterized in that in transmitting with the shielding of time slot
Before interference signal, other shielding interference signals in the uplink signal and shielding area to handset emissions is also needed to implement to screen；It is right
It is determined as mobile phone signal, further detection identifies whether the uplink signal strength reaches the power level thresholding of setting；To sentencing
It is set to other shielding interference signals, stops the action of next step.
3. the screen method of GSM mobile handset signal according to claim 1, which is characterized in that the uplink of the handset emissions
Slot period includes recognition detection period and shielding emission period；The recognition detection period identifies uplink letter for detecting
Whether number intensity reaches the level threshold of setting, is more than setting power level thresholding to uplink signal strength, emits in shielding
Period emits the shielding interference signal with time slot, and keeps the intensity of the interference signal strong more than the uplink signal of handset emissions
Degree, with the reception of interference base station, to interrupt the communication of mobile phone.
4. the screen method of GSM mobile handset signal according to claim 3, which is characterized in that there is also it in shielding area
When he shields interference signal, the recognition detection period is additionally operable to its in the uplink signal and shielding area of screening handset emissions
He shields interference signal, and to being determined as the uplink signal of handset emissions, further whether detection uplink signal strength, which reaches, sets
Fixed power level thresholding is more than setting level threshold to uplink signal strength, in shielding emission period transmitting with time slot
Shield interference signal, and make the interference signal intensity be more than handset emissions uplink signal intensity, with connecing for interference base station
It receives, to interrupt the communication of mobile phone.
5. the screen method of GSM mobile handset signal according to claim 2, which is characterized in that in shielding area, physics phase
The tranmitting frequency of adjacent each shielding interference signal is different.
6. the screen method of GSM mobile handset signal according to claim 1, which is characterized in that use ascending time slot coaching method：
Before transmitting is with the shielding interference signal of time slot, the boundary of time slot and slot length of the uplink of mobile phone up-link carrier, institute are obtained
It includes time slot beginning boundary and time slot end boundary to state boundary of time slot, when the boundary of time slot and slot length of uplink constitute uplink
The gap period.
7. the screen method of GSM mobile handset signal according to claim 6, which is characterized in that in ascending time slot coaching method,
Base station time slot cycle period is trained using time slot, first the mobile phone under a base station has all been shielded, has then looked for another base station again
It so repeats to shield in order all in shielding area under all different base stations the time slot cycle of training of corresponding mobile phone
Mobile phone.
8. the screen method of GSM mobile handset signal according to claim 1, which is characterized in that the gap while transmitting
The centre frequency of interference signal is carrier deviation a certain amount of GSM mobile handset carrier signal.
9. according to the screen method of claim 1 to 8 any one of them GSM mobile handset signal, which is characterized in that connect by diversity
Receiving method obtains the uplink signal of GSM mobile handset.
10. a kind of shielding harness of GSM mobile handset signal, which is characterized in that include mainly uplink receiving antenna, filter, power
Detection comparator, jamming transmitter and uplink interference antenna；The uplink signal of GSM mobile handset in shielding area is through uplink receiving
Power detection comparator is sent to after antenna trapping after filter filtering, the detection identification uplink letter within the ascending time slot period
Whether number intensity reaches the power level thresholding of setting, and judges whether the mobile phone for emitting the uplink signal is located at blind zone with this
In domain；For the mobile phone for being judged to being located in shielding area, power detection comparator sends a signal to jamming transmitter and notifies it
Gap interference signal to the mobile phone to implement to shield while emissive porwer is more than the uplink signal strength of handset emissions.
11. the shielding harness of GSM mobile handset signal according to claim 10, which is characterized in that the filter includes carrying
Wave filter module, the carrier wave filter module are used to implement to filter to mobile phone uplink signal；Signal in shielding area is through uplink
Power detection comparator is sent to screen whether the signal is mobile phone after the filtering of carrier wave filter module after reception antenna capture
Signal is detected its signal strength and whether reaches the power level thresholding of setting, and judged with this for being determined as mobile phone signal
Whether the mobile phone for emitting the uplink signal is located in shielding area；For the mobile phone for being judged to being located in shielding area, power inspection
Survey comparator sends a signal to jamming transmitter and its transmitting is notified to implement to shield to the mobile phone with slot interfering signal of time.
12. the shielding harness of GSM mobile handset signal according to claim 11, which is characterized in that the filter further includes
Interference signal filter module is shielded, the shielding interference signal filter module is used for other shielding device transmittings in shielding harness
Signal implements filtering；Signal in shielding area is interfered through carrier wave filter module and shielding respectively after uplink receiving antenna trapping
Power detection comparator is sent to screen whether the signal is mobile phone signal, for being determined as hand after the filtering of signal filter module
Machine signal, the power level thresholding whether its signal strength reaches setting is detected, and judge with this to emit the uplink signal
Whether mobile phone is located in shielding area；For the mobile phone for being judged to being located in shielding area, power detection comparator sends signal
Its transmitting is notified to implement to shield to the mobile phone with slot interfering signal of time to jamming transmitter.
13. the shielding harness of GSM mobile handset signal according to claim 12, which is characterized in that the carrier wave filter module
It is different with the operating center frequency and bandwidth of shielding interference signal filter module.
14. the shielding harness of GSM mobile handset signal according to claim 13, which is characterized in that uplink interference transmitter is sent out
The centre frequency for the interference signal penetrated is carrier deviation a certain amount of GSM mobile handset carrier signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2019/080323 WO2020024602A1 (en) | 2018-07-26 | 2019-03-29 | Gsm mobile phone signal blocking method and system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810832411 | 2018-07-26 | ||
| CN2018108324115 | 2018-07-26 |
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| CN108737015A true CN108737015A (en) | 2018-11-02 |
| CN108737015B CN108737015B (en) | 2023-08-15 |
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| CN201810855581.5A Active CN108737015B (en) | 2018-07-26 | 2018-07-31 | Method and system for shielding GSM mobile phone signals |
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| CN (1) | CN108737015B (en) |
| WO (1) | WO2020024602A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020024602A1 (en) * | 2018-07-26 | 2020-02-06 | 浙江三维通信科技有限公司 | Gsm mobile phone signal blocking method and system |
| CN112511262A (en) * | 2020-11-23 | 2021-03-16 | 浙江三维通信科技有限公司 | Cooperative shielding method, shielding system, storage medium and electronic device |
| CN113572566A (en) * | 2021-06-30 | 2021-10-29 | 广州市瀚云信息技术有限公司 | Control method and device of movable shielding device |
| WO2022222243A1 (en) * | 2021-04-19 | 2022-10-27 | 浙江三维通信科技有限公司 | Method and apparatus for controlling system to transmit signal, and storage medium and electronic apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111970066B (en) * | 2020-08-14 | 2022-08-02 | 浙江三维通信科技有限公司 | Power detection method and device, storage medium and electronic device |
| CN112910599B (en) * | 2021-02-02 | 2022-10-28 | 安徽中屏科技有限公司 | Cheating interference feedback system based on multi-dimensional analysis |
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Also Published As
| Publication number | Publication date |
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| WO2020024602A1 (en) | 2020-02-06 |
| CN108737015B (en) | 2023-08-15 |
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