CN103619060B - A kind of intelligent shielding method of GSM communication terminal - Google Patents
A kind of intelligent shielding method of GSM communication terminal Download PDFInfo
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- CN103619060B CN103619060B CN201310670606.1A CN201310670606A CN103619060B CN 103619060 B CN103619060 B CN 103619060B CN 201310670606 A CN201310670606 A CN 201310670606A CN 103619060 B CN103619060 B CN 103619060B
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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 belongs to mobile communication technology field, disclose a kind of intelligent shielding method of GSM communication terminal, comprise the steps: first before interference signal sends, the forward link carriers of base station is scanned for and is determined carrier frequency, next scrambler short to PCH carries out synchronization and determines, finally produces and launches the walsh code identical with base station calling signal and short scrambler and the interference signal synchronized.It is high that the present invention has jamming power utilization rate, and the feature that shield effectiveness is good can reduce by tens times than conventional method jamming power, reduce to greatest extent healthy impact and the pollution of external electromagnetic environment.
Description
Technical field
The invention belongs to mobile communication technology field, be specifically related to the intelligent shielding of a kind of GSM communication terminal
Method.
Background technology
Being widely used of domestic honeycomb mobile communication has brought the most simultaneously, at some special occasions ratio
Such as unlawful assembly point, prison and all kinds of close place, bring the biggest hidden danger also to stability maintenance, safety and security work, need
The mobile communication equipment in these specific regions and place is carried out necessity, adequate shielding, to ensure safety.
Mobile communication is shielded, is not the local mobile communications network of shielding, but to the communication in specific region eventually
End equipment implements interference so that it is can not communicate, and can not affect the normal work of local base station simultaneously, so, typically choose base
The forward link signal stood disturbs.
Common mobile communication shielding device mostly uses and carries out sawtooth waveforms frequency sweep or comb spectrum in required interference band
The method blocked.The method realizes simple, but poor to the mobile communication interference effect of spread spectrum communication system, needs transmitting ratio communication
The several ten times larger signal of signal power could be suppressed, to be chronically at personnel in shielding area healthy may have bigger
Impact, has serious electromagnetic pollution to surrounding environment.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, it is provided that the intelligent shielding side of a kind of GSM communication terminal
Method, has jamming power utilization rate high, and the feature that shield effectiveness is good can reduce by tens times than conventional method jamming power, maximum
Limit ground reduces healthy impact and the pollution of external electromagnetic environment.
The main technical schemes that the present invention uses is:
A kind of intelligent shielding method of GSM communication terminal, comprises the steps:
Step is 1.: before interference signal sends, scans for the forward link carriers of base station and enters carrier frequency
Row determines, wherein the radiofrequency signal of the cdma2000 Base Transmitter of antenna reception 800MHz and 2GHz frequency range, with switch timesharing warp
Export intermediate-freuqncy signal after crossing analog down and amplifying, after analog-to-digital conversion, first search for main preferred frequency channel, again to residue
All channels carry out traversal search, during search, first carry out Fourier transform and spectra calculation at numeric field, then with certain
Threshold value and power meter value indicative carry out judging with presence or absence of signal, finally determine the frequency of carrier wave；
Step is 2.: scrambler short to PCH carries out synchronization and determine, i.e. receives cdma2000 base station signal under simulation
Frequency conversion, analog-to-digital conversion, Digital Down Convert, CIC extraction, FIR LPF, then by pilot search, synchronized tracking, phase-locked, complete
Become capturing carrier and the short scrambling code synchronization of PCH；
Step is 3.: produce and launch the walsh code identical with base station calling signal and short scrambler and the interference letter synchronized
Number, i.e. utilize frequency-tracking and the synchronizing information of short scrambled chip tracking of acquired base station signal, it was predicted that base station will be sent out
Send the transmission time of walsh code, and when launching interference with send the transmission time synchronized of walsh code, make transmitting disturb signal
Walsh code identical with the walsh code of base station calling channel and scrambler with short scrambler and synchronize, interference base station is sent to
The signaling of terminal.
The present invention also uses following attached technical scheme:
The frequency range of step 1. middle 800MHz indication is 870-880MHz, and frequency concrete in described 870-880MHz is
878.49MHz, 877.26MHz, 876.03MHz, 874.80MHz, 873.57MHz, 872.34MHz, 871.11MHz, work as intermediate frequency
Signal is 21.4MHz, and switching rate during analog-to-digital conversion is 157.2864msps, and Fourier transform is counted when being 1024, right
The digital power frequency spectrum answered be respectively the 162nd point, the 154th point, the 146th point, the 138th point, the 130th point, the 122nd point, the 114th
Point.
The frequency range of step 1. middle 2GHz indication is 2110-2125MHz, and frequency concrete in described 2110-2125MHz is
2111.25MHz、2112.5MHz、2113.75MHz、2115MHz、2116.25MHz、2117.5MHz、2118.75MHz、
2120MHz, 2121.25MHz, 2122.5MHz, 2123.75MHz, when intermediate-freuqncy signal is 21.4MHz, conversion during analog-to-digital conversion
Speed is 157.2864msps, and Fourier transform is counted when being 1024, corresponding digital power frequency spectrum be respectively the 99th point, the
107 points, the 115th point, the 123rd point, the 131st point, the 139th point, the 147th point, the 156th point, the 164th point, the 172nd point, the 180th
Point.
The specific formula for calculation of step 1. middle 800MHz threshold value (G1) is: threshold value (G1)=A1+B1, works as intermediate-freuqncy signal
For 21.4MHz, switching rate during analog-to-digital conversion is 157.2864msps, and Fourier transform is counted when being 1024, described A1
It is the 160th point, the 161st point, the 162nd point, the 163rd point, the 164th the frequency numerical value sum that totally 5 digital power spectrums are corresponding
1/4th, described B1 is the 168th point, the 169th point, the 170th point, the 171st point, the 172nd totally 5 digital power spectrums pair
3/4ths of the frequency numerical value sum answered, described power meter value indicative (W1) with the 162nd point, the 154th point, the 146th point, the 138th
Point, the 130th point, the 122nd point, the 114th frequency that each digital power frequency spectrum in totally 7 points is corresponding and left and right adjacent each 2
Individual frequency numerical value sum represents, then the power meter value indicative with threshold value (G1) frequency corresponding with above-mentioned 7 digital power spectrums
(W1) compare respectively, when the power meter value indicative (W1) of frequency corresponding to above-mentioned 7 digital power spectrums is more than threshold value
(G1) time, it is determined that for the base station carrier frequency of 800MHz frequency range and record.
Step 1. middle 2GHz threshold value (G2) specific formula for calculation is: threshold value (G2)=(A2-B2)/4+C2, when intermediate frequency is believed
Number being 21.4MHz, switching rate during analog-to-digital conversion is 157.2864msps, and Fourier transform is counted when being 1024, described
A2 be 800MHz frequency range the 160th point, the 161st point, the 162nd point, the 163rd point, the 164th totally 5 digital power spectrums corresponding
Frequency numerical value sum, described B2 is the 168th point, the 169th point, the 170th point, the 171st point, the 172nd totally 5 digital power spectrums
Corresponding frequency numerical value sum, described C2 is the 91st point, the 92nd point, the 93rd point, the 186th point, the 187th totally 5 digital powers
The frequency numerical value sum that frequency spectrum is corresponding, described power meter value indicative (W2) with the 99th point, the 107th point, the 115th point, the 123rd point,
131 points, the 139th point, the 147th point, the 156th point, the 164th point, the 172nd point, the 180th each digital power in totally 11 points
Adjacent each 2 the frequency numerical value sums of frequency and left and right that frequency spectrum is corresponding represent, then by threshold value (G2) and above-mentioned 11 digital merits
The power meter value indicative (W2) of the frequency that rate frequency spectrum is corresponding compares respectively, when the frequency that above-mentioned 11 digital power spectrums are corresponding
Power meter value indicative (W2) more than threshold value (G2) time, it is determined that for the base station carrier frequency of 2GHz frequency range and record.
Using the present invention to have the benefit that and have jamming power utilization rate height, the feature that shield effectiveness is good, ratio is often
Rule method jamming power can reduce by tens times, reduces to greatest extent healthy impact and the dirt of external electromagnetic environment
Dye.
Accompanying drawing explanation
It is described further below in conjunction with accompanying drawing:
The composition frame chart of Fig. 1 present invention a kind of GSM communication terminal shielding device；
The functional block diagram of Fig. 2 scrambling code synchronization short to PCH；
Fig. 3 energy accumulation relevant peaks capture composition frame chart；
Fig. 4 carrier wave residual error estimates structured flowchart；
Fig. 5 carrier synchronization and timing bit synchronization composition frame chart；
Fig. 6 second-order loop filter structured flowchart；
Fig. 7 cdma2000 PCH interference signal produces functional block diagram.
Detailed description of the invention
As shown in Figure 1-Figure 3, in the present embodiment, a kind of intelligent shielding method of GSM communication terminal, bag
Include following steps:
Step is 1.: before interference signal sends, scans for the forward link carriers of base station and enters carrier frequency
Row determines, wherein the radiofrequency signal of the cdma2000 Base Transmitter of antenna reception 800MHz and 2GHz frequency range, with switch timesharing warp
Export 21.4MHz intermediate-freuqncy signal, intermediate-frequency bandwidth 15MHz after crossing analog down and amplifying, turn through 157.2864msps modulus
After changing, first search for main preferred frequency channel, more remaining all channels are carried out traversal search, during search, first enter at numeric field
The conversion of row 1024 point Fourier and spectra calculation, then carry out sentencing with presence or absence of signal by certain threshold value and power meter value indicative
Disconnected, finally determine the frequency of carrier wave；Wherein, the frequency range of 800MHz indication is 870-880MHz, concrete in described 870-880MHz
Frequency be 878.49MHz, 877.26MHz, 876.03MHz, 874.80MHz, 873.57MHz, 872.34MHz,
871.11MHz, corresponding digital power frequency spectrum be respectively the 162nd point, the 154th point, the 146th point, the 138th point, the 130th point, the
122 points, the 114th point, the specific formula for calculation of 800MHz threshold value (G1) is: threshold value (G1)=A1+B1, described A1 are the 160th
Point, the 161st point, the 162nd point, the 163rd point, the 164th the frequency numerical value sum that totally 5 digital power spectrums are corresponding four/
One, described B1 are the 168th point, the 169th point, the 170th point, the 171st point, the 172nd frequency that totally 5 digital power spectrums are corresponding
3/4ths of numerical value sum, described power meter value indicative (W1) with the 162nd point, the 154th point, the 146th point, the 138th point, the 130th
Point, the 122nd point, the 114th adjacent each 2 the frequency numbers of frequency and left and right that each digital power frequency spectrum in totally 7 points is corresponding
Value sum represents, then by the power meter value indicative (W1) of threshold value (G1) frequency corresponding with above-mentioned 7 digital power spectrums respectively
Compare, when the power meter value indicative (W1) of frequency corresponding to above-mentioned 7 digital power spectrums is more than threshold value (G1), it is determined that
For the base station carrier frequency of 800MHz frequency range and record；The frequency range of 2GHz indication is 2110-2125MHz, described 2110-
Frequency concrete in 2125MHz is 2111.25MHz, 2112.5MHz, 2113.75MHz, 2115MHz, 2116.25MHz,
2117.5MHz, 2118.75MHz, 2120MHz, 2121.25MHz, 2122.5MHz, 2123.75MHz, corresponding digital power frequency
Spectrum be respectively the 99th point, the 107th point, the 115th point, the 123rd point, the 131st point, the 139th point, the 147th point, the 156th point, the 164th
Point, the 172nd point, the 180th point, 2GHz threshold value (G2) specific formula for calculation is: threshold value (G2)=(A2-B2)/4+C2, described
A2 be 800MHz frequency range the 160th point, the 161st point, the 162nd point, the 163rd point, the 164th totally 5 digital power spectrums corresponding
Frequency numerical value sum, described B2 is the 168th point, the 169th point, the 170th point, the 171st point, the 172nd totally 5 digital power spectrums
Corresponding frequency numerical value sum, described C2 is the 91st point, the 92nd point, the 93rd point, the 186th point, the 187th totally 5 digital powers
The frequency numerical value sum that frequency spectrum is corresponding, described power meter value indicative (W2) with the 99th point, the 107th point, the 115th point, the 123rd point,
131 points, the 139th point, the 147th point, the 156th point, the 164th point, the 172nd point, the 180th each digital power in totally 11 points
Adjacent each 2 the frequency numerical value sums of frequency and left and right that frequency spectrum is corresponding represent, then by threshold value (G2) and above-mentioned 11 digital merits
The power meter value indicative (W2) of the frequency that rate frequency spectrum is corresponding compares respectively, when the frequency that above-mentioned 11 digital power spectrums are corresponding
Power meter value indicative (W2) more than threshold value (G2) time, it is determined that for the base station carrier frequency of 2GHz frequency range and record.
Step is 2.: scrambler short to PCH carries out synchronization and determine, i.e. receives cdma2000 base station signal under simulation
Frequency conversion, analog-to-digital conversion, Digital Down Convert, CIC extraction, FIR LPF, then by pilot search, synchronized tracking, phase-locked, complete
Become capturing carrier and the short scrambling code synchronization of PCH；512 chips are used to carry out relevant search by correlator in the present invention, and
The parallel correlated results in multiple short scrambler cycles is carried out energy accumulation again, obtains correlation peak and capture, trapping module
Time delay slip correlation computations and judgement is constantly carried out with receiving data by local PN code sequence, until when the base station received
When short scrambler and this locality short scrambling code synchronization error is in 0.5 chip range, just can obtain correlation peak, and with as judgement amount
Decision signal exists.Due to short scrambler cycle longer (32768), the energy accumulation energy accumulation ability in eight short scrambler cycles
Effectively making decisions relevant peaks, the bit rate skew that various factors causes should be less than 32768 × 8/1228800=
Relevant peaks could normally effectively be captured by 0.21Hz.After frequency search module acquisition success, residue carrier wave frequency deviation is at 75Hz
Left and right.It is directly entered carrier loop and can cause loop capture and the instability followed the tracks of, therefore, first entered by carrier wave residual error estimation module
Row inherent spurious frequency deviation is estimated, the carrier wave frequency deviation error after estimation estimates structured flowchart as shown in Figure 4 in about 20Hz, carrier wave residual error.
After carrier wave residual error estimation module, residue carrier wave frequency deviation is at about 20Hz, incoming carrier loop and Timed Recovery
Loop, carries out carrier synchronization and timing bit synchronization.Carrier synchronization and timing bit sync module composition frame chart are as shown in Figure 5.Wherein,
Carrier wave phase discriminator is symbol (point) phase discriminator:.Regularly phase discriminator uses the Gardner phase discriminator simplified to realize:
Loop filter uses second-order loop filter, as shown in 6 figures.For loop filter resonance frequency
Rate,For loop noise bandwidth,Being typically based on reality applies both noise situations to be obtained by emulation, and the present invention uses,For pilot frequency information symbol period.
Step is 3.: produce and launch the walsh code identical with base station calling signal and short scrambler and the interference letter synchronized
Number, as it is shown in fig. 7, i.e. utilize frequency-tracking and the synchronizing information of short scrambled chip tracking of acquired base station signal, it was predicted that
Base station will send the transmission time of walsh code, and when launching interference with send the transmission time synchronized of walsh code, make to send out
It is identical with the walsh code of base station calling channel and scrambler with short scrambler and synchronize, interference that blackberry lily disturbs the walsh code of signal
Base station is sent to the signaling of terminal, and wherein receiver module and interference module are all in same FPGA real-time implementation, for base station
Different carrier, carries out timesharing interference by the local frequency changing simulation upconverter.
The present invention is not limited to above example, every is drawn according to technical scheme by those skilled in the art
Other embodiments, within also falling within protection scope of the present invention.
Claims (5)
1. the intelligent shielding method of a GSM communication terminal, it is characterised in that: comprise the steps:
Step is 1.: before interference signal sends, scan for and the forward link carriers of cdma2000 base station to carrier frequency
Rate is determined, wherein the radiofrequency signal of the cdma2000 Base Transmitter of antenna reception 800MHz and 2GHz frequency range, with switch point
Time export intermediate-freuqncy signal through analog down with after amplifying, after analog-to-digital conversion, the first main preferred frequency channel of search, the most right
Remaining all channels carry out traversal search, during search, first carry out Fourier transform and spectra calculation at numeric field, then,
Carry out judging, really with presence or absence of signal by the power meter value indicative of the threshold value of 800MHz frequency range Yu each frequency channel of 800MHz frequency range
Determine the frequency of each carrier wave of 800MHz frequency range cdma2000 Base Transmitter, with the threshold value of 2GHz frequency range and 2GHz frequency range each
The power meter value indicative of frequency channel carries out judging with presence or absence of signal, determines each carrier wave of 2GHz frequency range cdma2000 Base Transmitter
Frequency；
Step is 2.: scrambler short to PCH carries out synchronization and determine, i.e. receive cdma2000 base station signal through analog down,
Analog-to-digital conversion, Digital Down Convert, CIC extraction, FIR LPF, then by pilot search, synchronized tracking, phase-locked, complete carrier wave
Capture and the short scrambling code synchronization of PCH；
Step is 3.: produce with launch the walsh code identical with cdma2000 base station calling signal and short scrambler and synchronize dry
Disturb signal, i.e. utilize frequency-tracking and the synchronizing information of short scrambled chip tracking of acquired cdma2000 base station signal, in advance
Survey cdma2000 base station and will send transmission time of walsh code, and when launching interference with the transmission time sending walsh code
Synchronize, make the walsh code of the interference signal of transmitting and short scrambler complete with the walsh code of cdma2000 base station calling channel and scrambler
Exactly the same and synchronize, interference cdma2000 base station is sent to the signaling of terminal.
The intelligent shielding method of a kind of GSM communication terminal the most as claimed in claim 1, it is characterised in that: described
Step 1. in the frequency range of 800MHz indication be 870-880MHz, frequency concrete in described 870-880MHz be 878.49MHz,
877.26MHz, 876.03MHz, 874.80MHz, 873.57MHz, 872.34MHz, 871.11MHz, when intermediate-freuqncy signal is
21.4MHz, switching rate during analog-to-digital conversion is 157.2864msps, and Fourier transform is counted when being 1024, corresponding number
Word power spectrum is respectively the 162nd point, the 154th point, the 146th point, the 138th point, the 130th point, the 122nd point, the 114th point.
The intelligent shielding method of a kind of GSM communication terminal the most as claimed in claim 1, it is characterised in that: described
The frequency range of step 1. middle 2GHz indication is 2110-2125MHz, and frequency concrete in described 2110-2125MHz is
2111.25MHz、2112.5MHz、2113.75MHz、2115MHz、2116.25MHz、2117.5MHz、2118.75MHz、
2120MHz, 2121.25MHz, 2122.5MHz, 2123.75MHz, when intermediate-freuqncy signal is 21.4MHz, conversion during analog-to-digital conversion
Speed is 157.2864msps, and Fourier transform is counted when being 1024, corresponding digital power frequency spectrum be respectively the 99th point, the
107 points, the 115th point, the 123rd point, the 131st point, the 139th point, the 147th point, the 156th point, the 164th point, the 172nd point, the 180th
Point.
The intelligent shielding method of a kind of GSM communication terminal the most as claimed in claim 1 or 2, it is characterised in that:
The specific formula for calculation of the described step 1. threshold value (G1) of middle 800MHz frequency range is: threshold value (G1)=A1+B1, when intermediate frequency is believed
Number being 21.4MHz, switching rate during analog-to-digital conversion is 157.2864msps, and Fourier transform is counted when being 1024, described
A1 be the 160th point, the 161st point, the 162nd point, the 163rd point, the 164th frequency numerical value that totally 5 digital power spectrums are corresponding it
/ 4th of sum, described B1 is the 168th point, the 169th point, the 170th point, the 171st point, the 172nd totally 5 digital power spectrums
3/4ths of corresponding frequency numerical value sum, described power meter value indicative (W1) with the 162nd point, the 154th point, the 146th point, the
138 points, the 130th point, the 122nd point, the 114th frequency and the left and right that each digital power frequency spectrum in totally 7 points is corresponding are adjacent
Each 2 frequency numerical value sums represent, then characterize with the power of threshold value (G1) frequency corresponding with above-mentioned 7 digital power spectrums
Value (W1) compares respectively, when the power meter value indicative (W1) of frequency corresponding to above-mentioned 7 digital power spectrums is more than threshold value
(G1) time, it is determined that for the cdma2000 base station carrier frequency of 800MHz frequency range and record.
5. the intelligent shielding method of a kind of GSM communication terminal as described in any one of claim 1-3, its feature
It is: threshold value (G2) specific formula for calculation of described step 1. middle 2GHz frequency range is: threshold value (G2)=(A2-B2)/4+C2,
When intermediate-freuqncy signal is 21.4MHz, switching rate during analog-to-digital conversion is 157.2864msps, and it is 1024 points that Fourier transform is counted
Time, described A2 is 800MHz frequency range the 160th point, the 161st point, the 162nd point, the 163rd point, the 164th totally 5 digital power spectrums
Corresponding frequency numerical value sum, described B2 is the 168th point, the 169th point, the 170th point, the 171st point, the 172nd totally 5 digital merits
The frequency numerical value sum that rate frequency spectrum is corresponding, described C2 be the 91st point of 2GHz frequency range, the 92nd point, the 93rd point, the 186th point, the 187th
Point totally 5 digital power spectrums are corresponding frequency numerical value sum, described power meter value indicative (W2) with the 99th point of 2GHz frequency range, the
107 points, the 115th point, the 123rd point, the 131st point, the 139th point, the 147th point, the 156th point, the 164th point, the 172nd point, the 180th point
Adjacent each 2 the frequency numerical value sums of frequency and left and right that each digital power frequency spectrum in totally 11 points is corresponding represent, then use door
The power meter value indicative (W2) of the frequency that limit value (G2) is corresponding with above-mentioned 11 digital power spectrums compares respectively, when above-mentioned 11
When the power meter value indicative (W2) of the frequency that individual numeral power spectrum is corresponding is more than threshold value (G2), it is determined that for 2GHz frequency range
Cdma2000 base station carrier frequency is also recorded.
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| CN111465037A (en) * | 2020-03-27 | 2020-07-28 | 西安中本教育科技有限公司 | Mobile phone signal time-sharing partition and function setting control method |
| CN111711477B (en) * | 2020-04-26 | 2022-05-10 | 四川润泽经伟信息技术有限公司 | Carrier interference system, method and device based on satellite communication countermeasure system |
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| CN103619060A (en) | 2014-03-05 |
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