WO2021051821A1 - 信号屏蔽装置及方法 - Google Patents

信号屏蔽装置及方法 Download PDF

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Publication number
WO2021051821A1
WO2021051821A1 PCT/CN2020/087957 CN2020087957W WO2021051821A1 WO 2021051821 A1 WO2021051821 A1 WO 2021051821A1 CN 2020087957 W CN2020087957 W CN 2020087957W WO 2021051821 A1 WO2021051821 A1 WO 2021051821A1
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WIPO (PCT)
Prior art keywords
signal
shielding
modulation
module
frequency
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PCT/CN2020/087957
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English (en)
French (fr)
Inventor
杨剑峰
袁勇超
黄传彬
沈滨
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浙江三维通信科技有限公司
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Publication of WO2021051821A1 publication Critical patent/WO2021051821A1/zh

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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
    • H04K3/42—Jamming having variable characteristics characterized by the control of the jamming frequency or wavelength
    • 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
    • H04K3/68—Jamming involving special techniques using passive jamming, e.g. by shielding or reflection
    • 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

Definitions

  • This application relates to the field of mobile communication technology, and in particular to a signal shielding device and method.
  • the mobile phone and the base station are connected by radio waves, and the data and sound transmission is completed with a certain baud rate and modulation method.
  • the mobile phone signal jammer scans from the low-end frequency of the forward channel to the high-end at a certain speed during the working process. This scanning speed can cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station.
  • the mobile phone is manifested as a search network, no signal, no service system and other phenomena.
  • the traditional jammer adopts the analog frequency sweep scheme, generates a triangle wave through the NC555 timer, connects to the input of the voltage-controlled oscillator, then amplifies, and finally transmits through the antenna.
  • This shielding method is simple to operate and low in cost, so it is widely used.
  • this solution has problems such as fixed scanning frequency and cross-border scanning, which causes serious interference to other systems such as operator base stations and satellite communications.
  • the interference effect of the product itself is also very bad.
  • the changes in current network signals are also increasing.
  • the same frequency band often contains multiple communication standards, and different communication standards are not sensitive to the frequency sweep interference cycle.
  • different shielding circuits need to be set up for the existing network signals of different standards, resulting in lower shielding efficiency and increased cost.
  • the signal shielding device includes a receiving module, a modulation module, and a transmitting module.
  • the receiving module, the modulation module, and the transmitting module are connected in sequence, wherein:
  • Receiving module used to receive live network signals
  • the modulation module is used to receive the live network signal transmitted by the receiving module, and modulate the shielding signal based on the communication standard of the current network signal; wherein the communication standard modulation shielding signal based on the current network signal also includes identifying the current network signal standard , Generating corresponding modulation signals for different current network signal formats based on the prior knowledge of the best interference effect of the frequency sweeping frequency, and generating a shielding signal based on the modulation signal;
  • the transmitting module is used to transmit the shielding signal.
  • the modulation module includes a receiving unit, a baseband signal processing unit, and a shielding signal generating unit, wherein the receiving unit is connected to the receiving module, and the receiving unit, the baseband signal processing unit, and the shielding signal
  • the generating units are sequentially connected, the shielding signal generating unit is connected to the transmitting module, the receiving unit is configured to receive the live network signal transmitted by the receiving module and convert it into a digital signal, and the baseband signal processing unit receives the digital signal. And generate a modulated signal based on the digital signal, and the mask signal generating unit is configured to modulate a mask signal based on the modulated signal and transmit the mask signal to the transmitting module.
  • the baseband signal processing unit is also used to identify the standard, start frequency, and cutoff frequency of the live network signal, so as to adjust the frequency and boundary of the shielded signal.
  • the baseband signal processing signal is also used to adjust the boundary of the shielded signal and the start frequency and cutoff frequency of the intermediate frequency band for a shielded signal composed of multiple discontinuous frequency bands.
  • the shielding signal generating unit includes a digital-to-analog converter, a voltage-controlled oscillator, a modulation filter, and a modulation amplifier.
  • the digital-to-analog converter, the voltage-controlled oscillator, the modulation filter, and the modulation amplifier are sequentially Connected, the digital-to-analog converter is connected to the baseband signal processing unit, the modulation amplifier is connected to the transmitting module, and the baseband signal processing unit controls the digital-to-analog
  • the converter generates a corresponding waveform to control the voltage-controlled oscillator to generate a corresponding waveform and boundary, and processes the waveform through a modulation filter and a modulation amplifier to generate a shielding signal.
  • the baseband signal processing unit is further configured to receive a mask signal modulated by the modulation signal, and adjust the modulation signal based on the mask signal to adjust the boundary of the mask signal.
  • the baseband signal processing unit compares the boundary of the shielding signal with the boundary of the current network signal, and adjusts the output waveform of the digital-to-analog converter according to the error to adjust the shielding signal Boundary, calibrate the error formed by the voltage-controlled oscillator.
  • the baseband signal processing unit is further configured to analyze the switching signal of the current network signal of the time division duplex system, so that the shielding signal is sent when the current network signal of the time division duplex system is downlink.
  • the receiving unit includes a receiving amplifier, a mixer, a receiving filter, and an analog-to-digital converter.
  • the receiving amplifier, the mixer, the receiving filter, and the analog-to-digital converter are connected in sequence, and the The receiving amplifier is connected to the receiving module, the analog-to-digital converter is connected to the baseband signal processing unit, and the mixer includes a phase locked loop loop.
  • the signal shielding device further includes a filtering module, which is arranged between the receiving module and the modulation module, and is used to filter the live network signals of different frequency bands respectively.
  • the filter module includes a first radio frequency switch, a second radio frequency switch, and a filter structure.
  • the first radio frequency switch, the filter structure, and the second radio frequency switch are connected in sequence, and the first radio frequency switch is connected to the filter structure.
  • the receiving module is connected, the second radio frequency switch is connected to the modulation module, and the first radio frequency switch and the second radio frequency switch switch to the same frequency band when switching.
  • the filter structure includes at least one filter unit, and the frequency ranges covered by each filter unit do not overlap; the filter structure traverses all frequency bands through time-sharing switching, collects and analyzes live network signals.
  • the frequency bands of the first radio frequency switch and the second radio frequency switch are consistent with the frequency band of the phase locked loop loop.
  • the modulation module further includes a monitoring unit connected to the baseband signal processing unit and configured to monitor the operation status of the modulation module.
  • the modulation module further includes a clock unit, the clock unit is connected to the baseband signal processing unit and used for synchronizing with the frequency of the digital signal in the baseband signal processing unit.
  • the baseband signal processing unit is further used to analyze the frequency error of the time division duplex system, so that the clock unit is synchronized to the base station.
  • the modulation module further includes a variable gain amplifier for adjusting the strength of the shielding signal according to the strength of the live network signal.
  • a signal shielding method applied to the above-mentioned signal shielding device, and the method includes:
  • the shielding signal is transmitted.
  • the modulating the shielding signal based on the modulation signal includes:
  • the intensity of the analog signal is adjusted to generate a shielding signal.
  • the above-mentioned signal shielding device and method include a receiving module, a modulation module, and a transmitting module.
  • the receiving module is used to receive the current network signal modulation module, connected to the receiving module, and used to receive the current network signal transmitted by the receiving module, And modulate the shielded signal based on the communication standard of the existing network signal; wherein the modulation shielded signal of the communication standard based on the existing network signal also includes identifying the signal standard of the existing network, and based on the prior knowledge of the best interference effect of the sweep frequency for different currents
  • the network signal system generates a corresponding modulation signal, and generates a shielding signal based on the modulation signal;
  • the transmitting module is connected to the modulation module, and is used to receive and transmit the shielding signal, so the shielding signal can be adjusted according to changes in the current network signal , There is no need to set up different shielding circuits for different standards of live network signals, the shielding efficiency is higher, and the cost is lower.
  • FIG. 1 is a schematic diagram of a signal shielding device according to an embodiment of the application.
  • FIG. 2 is a schematic diagram of a signal shielding device according to another embodiment of the application.
  • FIG. 3 is a schematic diagram of a filtering module according to an embodiment of the application.
  • FIG. 4 is a schematic diagram of a modulation module according to an embodiment of the application.
  • FIG. 5 is a schematic diagram of a receiving unit according to an embodiment of the application.
  • Fig. 6 is a schematic diagram of a shielding signal generating unit according to an embodiment of the application.
  • FIG. 7 is a schematic diagram of frequency sweep control for live network signals of different communication standards according to an embodiment of the application.
  • FIG. 8 is a structural block diagram of a signal shielding device according to an embodiment of the application.
  • Fig. 9 is a network topology diagram of a monitoring unit according to an embodiment of the application.
  • FIG. 10 is a schematic diagram of a signal shielding method according to an embodiment of the application.
  • FIG. 1 is a schematic diagram of a signal shielding device according to an embodiment of the application.
  • the signal shielding device includes a receiving module 1, a modulation module 2, and a transmitting module 3. Among them:
  • Receiving module 1 for receiving live network signals
  • the modulation module 2 is connected to the receiving module 1, and is used to receive the live network signal transmitted by the receiving module 1, and modulate the shielding signal based on the communication standard of the current network signal; wherein the communication standard based on the current network signal modulates the shielding signal
  • the signal also includes identifying the signal system of the current network and generating corresponding modulation signals for different signal systems of the current network based on the prior knowledge that the frequency sweeping frequency interference effect is optimal, and generating a shielding signal based on the modulation signal;
  • the transmitting module is connected to the modulation module 2 and is used to receive and transmit the shielding signal.
  • the above-mentioned signal shielding device can adjust the shielding signal according to the change of the existing network signal, and there is no need to set different shielding circuits for the existing network signals of different standards, and the shielding efficiency is higher and the cost is lower.
  • FIG. 2 is a schematic diagram of a signal shielding device according to another embodiment of the application.
  • the signal shielding device includes a receiving module 1, a filtering module 4, a modulation module 2, and a transmitting module 3.
  • the receiving module 1, the filtering module 4, the modulation module 2, and the transmitting module 3 are connected in sequence.
  • the filtering module 4 is used to filter out the noise in the live network signal.
  • the receiving module 1 includes a receiving antenna, which may specifically be a broadband omnidirectional receiving antenna. It is understandable that the receiving module 1 can choose other types of antennas, as long as it achieves the effect of receiving signals from the existing network.
  • FIG. 3 is a schematic diagram of the filter module 4 according to an embodiment of the application.
  • the filter module 4 includes a first radio frequency switch 40, a second radio frequency switch 41, a first filter unit 42, and a second filter unit 43.
  • the first radio frequency switch 40, the first filter unit 42, the The second radio frequency switch 41 and the second filter unit 43 are connected in sequence, wherein the first radio frequency switch 40 is connected to the receiving module 1, and the second radio frequency switch 41 is connected to the modulation module 2.
  • the first radio frequency switch 40 and the second radio frequency switch 41 are used to control the live network signals of different frequency bands to be filtered by the first filter unit 42 or the second filter unit 43, so the first radio frequency switch 40 and When the second radio frequency switch 41 is switched, it must be synchronized to switch to a frequency band.
  • the live network signal transmitted by the receiving antenna is transmitted to the first filter unit 42 or the second filter unit 43 through the first radio frequency switch 40, and then passes through the first filter unit 42 or the second filter unit 43. After filtering, it is transmitted to the second radio frequency switch 41 and transmitted to the modulation module 2 through the second radio frequency switch 41.
  • the first filter unit 42 and the second filter unit 43 are a set of filter structures.
  • the filter structure includes two filter units. In other embodiments, it may include multiple filters. Units, the frequency ranges covered by each filter unit do not overlap, depending on the frequency band divisions of different countries or regions.
  • the frequency range of current network signals in China is 800MHz-2700MHz, which is divided into 8 frequency bands, namely 870MHz-880MHz, 930MHz-960MHz, 1805MHz-1880MHz, 1885MHz-1915MHz, 2010MHz-2015MHz, 2110MHz-2170MHz, 8 frequency bands such as 2300MHz-2390MHz, 2555MHz-2655MHz, etc.
  • 8 filter units corresponding to the frequency bands need to be set, and all frequency bands are traversed through time-sharing switching, and the live network signals are collected and analyzed.
  • the aforementioned radio frequency switch may be a single-pole multi-throw switch, and the number of fixed ends of the single-pole multi-throw switch matches the number of filter units of the filter structure, and corresponds to each other one to one. Specifically, when the filter structure includes 8 filter units, the radio frequency switch is a single-pole, eight-throw switch.
  • FIG. 4 is a schematic diagram of the modulation module 2 according to an embodiment of the application.
  • the modulation module 2 includes a receiving unit 20, a baseband signal processing unit 21, and a mask signal generating unit 22, wherein:
  • the receiving unit 20 is connected to the receiving module 1, the receiving unit 20, the baseband signal processing unit 21, and the shielding signal generating unit 22 are connected in sequence, and the shielding signal generating unit 22 is connected to the transmitting module; the receiving unit 20 is used to receive the receiving module 1
  • the transmitted live network signal is converted into a digital signal.
  • the baseband signal processing unit 21 recognizes the current network signal system and generates a corresponding modulation signal based on different current network signal systems.
  • the shielding signal generating unit 22 is used to modulate the shielding signal based on the modulation signal and generate a corresponding modulation signal.
  • the shielding signal is transmitted to the transmitting module.
  • FIG. 5 is a schematic diagram of the receiving unit 20 according to an embodiment of the application.
  • the receiving unit 20 includes a receiving amplifier 200, a mixer 201, a receiving filter 202, and an analog-to-digital converter 203.
  • the receiving amplifier 200, a mixer 201, a receiving filter 202, and an analog-to-digital converter 203 The converter 203 is connected in sequence, the receiving amplifier 200 is connected to the receiving module 1, and the analog-to-digital converter 203 is connected to the baseband signal processing unit 21.
  • the live network signal is filtered by the filter module 4 and then transmitted to the receiving amplifier 200, amplified by the receiving amplifier 200, and then sent to the mixer 201, and then sent to the receiving filter 202 after being mixed.
  • the receiving filter 202 is filtered and sent to the analog-to-digital converter 203 to implement analog-to-digital conversion, which is converted into a digital signal and transmitted to the baseband signal processing unit 21.
  • the receiving amplifier 200 is a broadband radio frequency digital variable gain amplifier 223 (DVGA, Digital Variable Gain Amplifier), and the mixer 201 is integrated with a phase locked loop (PLL, Phase Locked Loop).
  • the phase-locked loop loop is used to uniformly integrate clock signals to make high-frequency devices work normally, such as memory access data.
  • the phase-locked loop loop is a feedback circuit whose function is to synchronize the phase of the clock on the circuit with a certain external clock.
  • the phase-locked loop loop realizes synchronization by comparing the phase of the external signal with the phase of the voltage-controlled crystal oscillator (VCXO). During the comparison, the phase-locked loop loop loop will continuously adjust the clock phase of the local crystal oscillator according to the phase of the external signal. Until the phases of the two signals are synchronized.
  • the phase-locked loop loop is used for feedback technology in oscillators. For many electronic devices to work normally, the external input signal is usually synchronized with the internal oscillation signal.
  • phase-locked loop loop is used to quickly synchronize to the corresponding receiving frequency band, such as 800MHZ, 900MHZ, 1800MHZ, 1900MHZ, 2100MHZ, 2300MHZ, 2600MHZ, etc.
  • the switching of the phase-locked loop frequency band and the first filter module 4 The radio frequency switch 40 and the second radio frequency switch 41 remain the same, and switch to the same frequency band when the frequency band is switched, so that the receiving module 1 can accurately receive the wireless signal of the corresponding frequency band.
  • the baseband signal processing unit 21 may specifically be an FPGA.
  • a plurality of shaping filters with different bandwidths and corresponding rate conversion modules are built in the FPGA program, and the digital signal passes through a direct digital controller.
  • DDC Direct Digital Control
  • the communication standard is identified through signal characteristics, and according to the different standard conditions of the existing network signal, triangle waves of different frequencies are emitted in the corresponding transmission channel to play a shielding role. It is understandable that the best scanning frequency for live network signals of different standards is a priori knowledge, which can be stored in the baseband signal processing unit 21 in advance.
  • the baseband signal processing unit 21 is also used to dynamically adjust the starting boundary of the frequency sweeping frequency.
  • the old communication standards in economically developed areas have been partially replanted, and underdeveloped areas have not yet been deployed.
  • the planned frequency band is the largest. Therefore, when the baseband signal processing unit 21 is working, the amplifier of the receiving unit 20 is coupled to the baseband, and the baseband signal processing unit 21 detects the output power of the channel to adjust the starting boundary of the sweep frequency.
  • the baseband signal processing unit 21 is used to identify the start frequency and cutoff frequency of the live network signal, so as to adjust the shield signal boundary.
  • the modulation filter 222 of the shielding signal generating unit 22 filters out the spurs and harmonics generated by the frequency sweep of the voltage-controlled oscillator 221.
  • the transition band of the board-level sound meter or the dielectric filter is relatively wide, Sweep frequency interference that cannot be suppressed at around 10MHz is generated to the sweep frequency boundary, and the uplink and downlink intervals between some operators are only 5MHz, such as the downlink frequency band 869 ⁇ 880MHz and the uplink frequency band 885-915MHz, the downlink frequency band 1805 ⁇ 1880MHz and the uplink frequency band 1885 ⁇ In the case of 1920MHz, it is necessary to precisely control the boundary of the shielding signal.
  • the baseband signal processing unit 21 controls the digital-to-analog converter 220 to enable the digital-to-analog
  • the converter 220 outputs the constant lowest level V1.
  • the voltage-controlled oscillator 221 outputs the lowest level of the corresponding frequency band, and then feeds it back to the baseband.
  • the baseband compares the lowest level fed back with the lowest level identified in the live network signal. Value comparison, and then adjust the lowest level of the digital-to-analog converter 220 according to the difference, until the lowest feedback level and the lowest level of the live network signal are within a preset error range to calibrate the low-frequency point boundary.
  • the baseband signal processing unit 21 is also used to control the digital-to-analog converter 220 so that the digital-to-analog converter 220 outputs a constant maximum level V2.
  • the voltage-controlled oscillator 221 outputs the maximum level of the corresponding frequency band, and then Feedback to the baseband, the baseband compares the highest level of feedback and the highest level identified in the current network signal to compare the difference, and then adjust the highest level of the digital-to-analog converter 220 according to the difference until the highest level of feedback is the same as the current network.
  • the highest level of the signal is within the preset error range to calibrate the high-frequency point boundary.
  • the shielding signal consists of multiple discontinuous frequency bands
  • the start and end points of the middle frequency band are also added to the dynamic calibration range.
  • the timing cycle calibrates the sweep boundary so that the sweep source is synchronized to the local clock, and the local clock is synchronized to the base station, which is equivalent to indirect synchronization of the sweep source to the base station.
  • the baseband signal processing unit 21 is further configured to receive a mask signal modulated by the modulation signal, and adjust the modulation signal based on the mask signal to adjust the boundary of the mask signal. It is understandable that the signal amplifier 224 is connected to the baseband signal processing unit at the same time, and sends the shielding signal to the baseband signal processing unit, and the baseband signal processing unit 21 adjusts the modulation signal based on the shielding signal. , To adjust the boundary of the shielding signal. Specifically, the baseband signal processing unit 21 compares the actual boundary of the shielded signal with the boundary of the base station signal analyzed by the receiving module 20, and fine-tunes the deviation formed by the DAC 220 to calibrate the voltage-controlled oscillator 221 according to the error.
  • the baseband signal processing unit 21 is also used to analyze the switching signal of the current network signal of the time division duplex system, so that the shielding signal is sent when the current network signal of the time division duplex system is downlink, so as to avoid affecting the base station. Up.
  • the frequency error is also obtained through analysis, and the frequency error is used to calibrate the local VCTCXO oscillator to synchronize the local clock to the base station.
  • the baseband signal processing unit 21 calculates the direct frequency error between the local VCTCXO clock and the base station by analyzing the wireless signal, and then adjusts the voltage control terminal of the VCTCXO by the internal voltage regulator circuit, and periodically calibrates the operation so that the equipment frequency and the base station maintain Synchronize. Since VCTCXO is the local reference clock of the device, after synchronizing to the base station, the device can achieve accurate and high-quality clock signals.
  • FIG. 6 is a schematic diagram of the shielding signal generating unit 22 according to an embodiment of the application.
  • the mask signal generating unit 22 includes a digital-to-analog converter 220, a voltage-controlled oscillator 221, a modulation filter 222, and a modulation amplifier.
  • the filter 222 and the modulation amplifier are connected in sequence, the digital-to-analog converter 220 is connected with the baseband signal processing unit 21, and the modulation amplifier is connected with the transmitting module.
  • the digital-to-analog converter 220 converts the digital signal transmitted by the baseband signal processing unit 21 into an analog signal, that is, a modulation waveform, which is processed by the voltage-controlled oscillator 221, the modulation filter 222 and the modulation amplifier to generate a shielding signal, and
  • the modulation amplifier transmits the shielding signal to the transmitting unit.
  • the modulation amplifier includes a digital variable gain amplifier 223 and a signal amplifier 224, which are used to adjust the strength of the shielding signal according to the strength of the current network signal.
  • the baseband signal processing unit 21 controls the digital-to-analog converter 220 to generate corresponding waveforms and controls the voltage-controlled oscillator 221 to generate corresponding waveforms and boundaries according to the standard recognition and boundary recognition.
  • FIG. 7 is a schematic diagram of frequency sweep control for live network signals of different communication standards according to an embodiment of the application.
  • the horizontal axis represents time
  • the vertical axis represents amplitude
  • the voltages V1 ⁇ V2 represent the low frequency point of a system.
  • the voltages V2 ⁇ V3 represent the sweep process from the low frequency point to the high frequency of another system.
  • the vertical axis can see the frequency change before and after.
  • the shielding signal generating unit 22 may include multiple shielding channels, and each channel includes a digital-to-analog converter 220, a voltage-controlled oscillator 221, a modulation filter 222, and a modulation amplifier, and can be controlled by the controller. Next, a shielding signal that shields the live network signals of different frequencies and different standards is generated.
  • the transmitting module includes a transmitting antenna array, which includes the downlink of all operator frequency bands.
  • FIG. 8 is a structural block diagram of a signal shielding device according to an embodiment of the application.
  • the shielding signal generating unit 22 includes two shielding channels, which can generate shielding signals for shielding live network signals of different frequencies and different formats under the control of the controller. .
  • the shielding signal generating unit may include multiple shielding channels.
  • the modulation module 2 further includes a clock unit, which is connected to the baseband signal processing unit and is used for synchronizing with the frequency of the digital signal in the baseband signal processing unit.
  • the modulation module 2 further includes a monitoring unit, which is connected to the receiving unit, the baseband signal processing unit, the shielding signal generation unit, and the clock unit, and is used to control the modulation module 2 Work is monitored and debugged and controlled. It is understandable that the monitoring unit may be an ARM processor or other processing chips.
  • FIG. 9 is a network topology diagram of a monitoring unit according to an embodiment of the application.
  • the cloud server is connected to the switch through the Internet, the switch is connected to the shielding device through the local area network, and the cloud server monitors the working status of the shielding device through the switch.
  • the application also discloses a signal shielding method, which is applied to the above-mentioned signal shielding device.
  • FIG. 10 is a schematic diagram of a signal shielding method according to an embodiment of the application.
  • the signal shielding method includes:
  • Step 900 Receive live network signals.
  • Step 910 Identify the communication standard, start frequency, and cutoff frequency of the live network signal, and generate a modulation signal based on the live network signal.
  • the current network signal transmitted by the receiving module is received, and the communication standard, start frequency, and cutoff frequency of the current network signal are identified to modulate a shielded signal whose frequency and boundary are compatible with the current network signal.
  • Step 920 Modulate the shielding signal based on the modulation signal.
  • the shielding signal is compatible with the communication standard, frequency, and boundary of the existing network signal.
  • the modulating the shielding signal based on the modulation signal includes: converting the modulation signal into an analog signal; adjusting the voltage of the analog signal; filtering the analog signal; adjusting the strength of the analog signal to generate Shield the signal.
  • Step 930 Transmit the shielding signal.
  • the above-mentioned signal shielding device and method include a receiving module 1, a modulation module 2, and a transmitting module 3.
  • the receiving module 1 is used to receive the current network signal
  • the modulation module 2 is connected to the receiving module 1 and used to receive the receiving module 1
  • the current network signal transmitted, and the shielding signal is modulated based on the communication standard of the current network signal
  • the transmitting module is connected to the modulation module 2 to transmit the shielding signal, so the shielding signal can be adjusted according to the change of the current network signal
  • the signal there is no need to set different shielding circuits for the existing network signals of different standards, and the shielding efficiency is higher and the cost is lower.
  • the signal shielding device can cyclically analyze and refresh the TDD switch, and use the resolved TDD switch as the enable switch signal of the corresponding TDD interference channel, so as to turn off the uplink of the corresponding TDD channel in the TDD frequency band to avoid interference with operators.
  • Base station the frequency sweep boundary of the signal shielding device is accurate, which can prevent the frequency sweep signal from falling into the uplink band, the frequency sweep energy utilization rate is high, and the interference efficiency is improved to a certain extent.
  • the signal shielding device utilizes a feedback link to periodically calibrate the sweep frequency boundary inside the FPGA to overcome the problem of excessive temperature drift of the voltage-controlled oscillator 221.
  • each transmission channel of the signal shielding device is dynamically adjusted by the DVGA. According to the signal strength of the existing network, it can be strong when strong and weak when weak, and the boundary of the shielding effect can be reasonably controlled.

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Abstract

本申请涉及一种信号屏蔽装置及方法，所述信号屏蔽装置包括接收模块、调制模块以及发射模块，所述接收模块、调制模块以及发射模块依次相连，其中：接收模块，用于接收现网信号；调制模块，用于接收所述接收模块传输的现网信号，并基于所述现网信号的通信制式调制屏蔽信号；其中基于现网信号的通信制式调制屏蔽信号还包括识别现网信号制式，并基于扫频频率干扰效果最优的先验知识针对不同现网信号制式生成对应的调制信号，并基于所述调制信号生成屏蔽信号；发射模块，用于发射所述屏蔽信号。上述信号屏蔽装置及方法能够根据现网信号的变化调整屏蔽信号，无需针对不同制式的现网信号设置不同屏蔽电路，屏蔽效率较高，成本较低。

Description

信号屏蔽装置及方法
相关申请
本申请要求2019年9月16日申请的，申请号为201910868905.3，名称为“信号屏蔽装置及方法”的中国专利申请的优先权，在此将其全文引入作为参考。
技术领域
本申请涉及移动通信技术领域，特别是涉及一种信号屏蔽装置及方法。
背景技术
手机工作时，是在一定的频率范围内，手机和基站通过无线电波连接起来，以一定的波特率和调制方式完成数据和声音的传输。针对这种通讯原理，手机信号屏蔽器在工作过程中以一定的速度从前向信道的低端频率向高端扫描。该扫描速度可以在手机接收报文信号中形成乱码干扰，手机不能检测出从基站发出的正常数据，使手机不能与基站建立联接。手机表现为搜索网络、无信号、无服务系统等现象。
传统屏蔽器采用模拟扫频方案，通过NC555定时器产生三角波，连接到压控振荡器输入端，再放大，最后通过天线发射。这种屏蔽方法操作简单且成本低，因此应用广泛，但该方案存在扫描频率固定，扫频边界过界等问题，对运营商基站、卫星通信等其他系统产生严重干扰，产品本身的干扰效果也非常差。此外随着运营商3G、4G、5G通信网络的建设和普及，现网信号的变化也越来越大，同一频段内往往包含多种通信制式，不同的通信制式对扫频干扰周期敏感程度不一，针对不同制式的现网信号，需要设置不同的屏蔽电路，导致屏蔽效率较低，成本增大。
发明内容
基于此，有必要针对随着运营商3G、4G、5G通信网络的建设和普及，现网信号的变化也越来越大，针对不同制式的现网信号，需要设置不同的屏蔽电路，导致屏蔽效率较低，成本增大的问题，提供一种信号屏蔽装置及方法。
一种信号屏蔽装置，所述信号屏蔽装置包括接收模块、调制模块以及发射模块，所述接收模块、调制模块以及发射模块依次相连，其中：
接收模块，用于接收现网信号；
调制模块，用于接收所述接收模块传输的现网信号，并基于所述现网信号的通信制式调制屏蔽信号；其中所述基于现网信号的通信制式调制屏蔽信号还包括识别现网信号制式，基于扫频频率干扰效果最优的先验知识针对不同现网信号制式生成对应的调制信号，并基于所述调制信号生成屏蔽信号；
发射模块，用于发射所述屏蔽信号。
在其中一个实施例中，所述调制模块包括接收单元、基带信号处理单元以及屏蔽信号生成单元，其中，所述接收单元与所述接收模块相连，所述接收单元、基带信号处理单元以 及屏蔽信号生成单元依次相连，所述屏蔽信号生成单元与所述发射模块相连，所述接收单元用于接收所述接收模块传输的现网信号并转换为数字信号，所述基带信号处理单元接收所述数字信号并基于所述数字信号生成调制信号，所述屏蔽信号生成单元用于基于所述调制信号调制屏蔽信号并将所述屏蔽信号传输给所述发射模块。
在其中一个实施例中，所述基带信号处理单元还用于识别所述现网信号的制式、起始频率以及截止频率，以调节所述屏蔽信号的频率和边界。
在其中一个实施例中，所述基带信号处理信号还用于对由多个不连续频段组成的屏蔽信号，调节所述屏蔽信号的边界以及中间频段的起始频率和截止频率。
在其中一个实施例中，所述屏蔽信号生成单元包括数模转换器、压控振荡器、调制滤波器以及调制放大器，所述数模转换器、压控振荡器、调制滤波器以及调制放大器依次相连，所述数模转换器与所述基带信号处理单元相连，所述调制放大器与所述发射模块相连，所述基带信号处理单元基于所述现网信号的制式和边界，控制所述数模转换器生成相应的波形来控制所述压控振荡器产生相应的波形和边界，并将所述波形通过调制滤波器以及调制放大器处理后生成屏蔽信号。
在其中一个实施例中，所述基带信号处理单元还用于接收所述调制信号调制的屏蔽信号，并基于所述屏蔽信号调节所述调制信号，以调节所述屏蔽信号的边界。
在其中一个实施例中，所述基带信号处理单元把所述屏蔽信号的边界和现网信号的边界进行比较，根据误差，调节所述数模转换器的输出波形，以调节所述屏蔽信号的边界，校准压控振荡器形成的误差。
在其中一个实施例中，所述基带信号处理单元还用于解析时分双工制式的现网信号的开关信号，以使所述屏蔽信号在时分双工制式的现网信号下行时发送。
在其中一个实施例中，所述接收单元包括接收放大器、混频器、接收滤波器以及模数转换器，所述接收放大器、混频器、接收滤波器以及模数转换器依次相连，所述接收放大器与所述接收模块相连，所述模数转换器与所述基带信号处理单元相连，所述混频器包括锁相环回路。
在其中一个实施例中，所述信号屏蔽装置还包括滤波模块，所述滤波模块设置于所述接收模块与所述调制模块之间，用于对不同频段的现网信号分别进行滤波。
在其中一个实施例中，所述滤波模块包括第一射频开关、第二射频开关以及滤波结构，所述第一射频开关、滤波结构以及第二射频开关依次相连，所述第一射频开关与所述接收模块相连，所述第二射频开关与所述调制模块相连，所述第一射频开关与所述第二射频开关切换时切换到同一频段。
在其中一个实施例中，所述滤波结构包括至少一个滤波单元，所述各个滤波单元覆盖的频率范围不重叠；所述滤波结构通过分时切换遍历所有频段，采集现网信号并且分析。
在其中一个实施例中，所述第一射频开关和所述第二射频开关与所述锁相环回路的频段一致。
在其中一个实施例中，所述调制模块还包括监控单元，所述监控单元与所述基带信号处理单元相连，用于监控所述调制模块的运行状况。
在其中一个实施例中，所述调制模块还包括时钟单元，所述时钟单元与所述基带信号处理单元相连，用于与所述基带信号处理单元中数字信号的频率进行同步。
在其中一个实施例中，所述基带信号处理单元还用于解析时分双工制式的频率误差，以使所述时钟单元同步到基站。
在其中一个实施例中，所述调制模块还包括可变增益放大器，用于根据所述现网信号的强度调节所述屏蔽信号的强度。
一种信号屏蔽方法，应用于上述信号屏蔽装置，所述方法包括：
接收现网信号；
识别所述现网信号的通信制式、起始频率以及截止频率，并基于所述现网信号生成调制信号；
基于所述调制信号调制屏蔽信号；
发射所述屏蔽信号。
在其中一个实施例中，所述基于所述调制信号调制屏蔽信号包括：
将所述调制信号转换为模拟信号；
调节所述模拟信号的电压；
对所述模拟信号进行滤波；
调节所述模拟信号的强度，生成屏蔽信号。
上述信号屏蔽装置及方法包括接收模块、调制模块以及发射模块，其中：接收模块，用于接收现网信号调制模块，与所述接收模块相连，用于接收所述接收模块传输的现网信号，并基于所述现网信号的通信制式调制屏蔽信号；其中所述基于现网信号的通信制式调制屏蔽信号还包括识别现网信号制式，基于扫频频率干扰效果最优的先验知识针对不同现网信号制式生成对应的调制信号，并基于所述调制信号生成屏蔽信号；发射模块，与所述调制模块相连，用于接收所述屏蔽信号并发射，因此能够根据现网信号的变化调整屏蔽信号，不需要针对不同制式的现网信号设置不同屏蔽电路，屏蔽效率较高，成本较低。
附图说明
图1为本申请一实施例的信号屏蔽装置的示意图；
图2为本申请另一实施例的信号屏蔽装置的示意图；
图3为本申请一实施例的滤波模块的示意图；
图4为本申请一实施例的调制模块的示意图；
图5为本申请一实施例的接收单元的示意图；
图6为本申请一实施例的屏蔽信号生成单元的示意图；
图7为本申请一实施例的针对不同通信制式现网信号的扫频控制的示意图；
图8为本申请一实施例的信号屏蔽装置的结构框图；
图9为本申请一实施例的监控单元的联网拓扑图；
图10为本申请一实施例的信号屏蔽方法的示意图。
具体实施方式
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
请参阅图1，图1为本申请一实施例的信号屏蔽装置的示意图。
在本实施例中，所述信号屏蔽装置包括接收模块1、调制模块2以及发射模块3，其中：
接收模块1，用于接收现网信号；
调制模块2，与所述接收模块1相连，用于接收所述接收模块1传输的现网信号，并基于所述现网信号的通信制式调制屏蔽信号；其中基于现网信号的通信制式调制屏蔽信号还包括识别现网信号制式并基于扫频频率干扰效果最优的先验知识针对不同现网信号制式生成对应的调制信号，并基于所述调制信号生成屏蔽信号；
发射模块，与所述调制模块2相连，用于接收所述屏蔽信号并发射。
上述信号屏蔽装置能够根据现网信号的变化调整屏蔽信号，无需针对不同制式的现网信号设置不同屏蔽电路，屏蔽效率较高，成本较低。
请参阅图2，图2为本申请另一实施例的信号屏蔽装置的示意图。
在本实施例中，所述信号屏蔽装置包括接收模块1、滤波模块4、调制模块2以及发射模块3，所述接收模块1、滤波模块4、调制模块2以及发射模块3依次相连。其中滤波模块4用于滤除现网信号中的噪声。
示例性地，所述接收模块1包括接收天线，具体可以是宽带全向接收天线。可以理解的，所述接收模块1可以选择其他类型的天线，只需达到接收现网信号的效果即可。
请参阅图3，图3为本申请一实施例的滤波模块4的示意图。在本实施例中，所述滤波模块4包括第一射频开关40、第二射频开关41、第一滤波单元42以及第二滤波单元43，所述第一射频开关40、第一滤波单元42、第二射频开关41以及第二滤波单元43依次相连，其中所述第一射频开关40与所述接收模块1相连，所述第二射频开关41与所述调制模块2相连。所述第一射频开关40与所述第二射频开关41用于控制不同频段的现网信号通过所述第一滤波单元42或第二滤波单元43进行滤波，因此所述第一射频开关40与所述第二射频开 关41切换时，必须保持同步切换到一个频段上。具体地，所述接收天线传输的现网信号通过所述第一射频开关40传输到所述第一滤波单元42或第二滤波单元43，经过所述第一滤波单元42或第二滤波单元43滤波后传输到所述第二射频开关41，并通过所述第二射频开关41传输给所述调制模块2。
示例性地，所述第一滤波单元42与第二滤波单元43为一组滤波结构，在本实施例中，所述滤波结构包括两个滤波单元，在其它实施例中，可以包括多个滤波单元，各个所述滤波单元覆盖的频率范围不重叠，取决于不同国家或地区的频段划分。具体地，中国的现网信号的频率范围为800MHz-2700MHz范围，将其分为8个频段，即870MHz-880MHz、930MHz-960MHz、1805MHz-1880MHz、1885MHz-1915MHz、2010MHz-2015MHz、2110MHz-2170MHz、2300MHz-2390MHz、2555MHz-2655MHz等8个频段，此时，需要设置8个对应频段的滤波单元，通过分时切换遍历所有频段，采集现网信号并且分析。
可以理解的，前述射频开关可以是单刀多掷开关，所述单刀多掷开关的不动端的数量与所述滤波结构的滤波单元的数量相匹配，且一一对应。具体地，当所述滤波结构包括8个滤波单元时，所述射频开关为单刀八掷开关。
请参阅图4，图4为本申请一实施例的调制模块2的示意图。在本实施例中，所述调制模块2包括接收单元20、基带信号处理单元21以及屏蔽信号生成单元22，其中：
接收单元20与所述接收模块1相连，接收单元20、基带信号处理单元21以及屏蔽信号生成单元22依次相连，屏蔽信号生成单元22与所述发射模块相连；接收单元20用于接收接收模块1传输的现网信号并转换为数字信号，所述基带信号处理单元21识别现网信号制式并基于不同现网信号制式生成对应的调制信号，屏蔽信号生成单元22用于基于调制信号调制屏蔽信号并将所述屏蔽信号传输给发射模块。
请参阅图5，图5为本申请一实施例的接收单元20的示意图。在本实施例中，所述接收单元20包括接收放大器200、混频器201、接收滤波器202以及模数转换器203，所述接收放大器200、混频器201、接收滤波器202以及模数转换器203依次相连，所述接收放大器200与所述接收模块1相连，所述模数转换器203与所述基带信号处理单元21相连。可以理解的，所述现网信号经所述滤波模块4滤波后传输到所述接收放大器200，经接收放大器200放大后送入混频器201，经混频后送入接收滤波器202，经接收滤波器202滤波后送入模数转换器203实现模数转换，转换为数字信号传输给所述基带信号处理单元21。具体地，所述接收放大器200为宽带射频数字可变增益放大器223(DVGA，Digital Variable Gain Amplifier)，所述混频器201集成有锁相环回路(PLL，Phase Locked Loop)。
可以理解的，所述锁相环回路用来统一整合时钟信号，使高频器件正常工作，如内存的存取资料等。锁相环回路是一种反馈电路，其作用是使得电路上的时钟和某一外部时钟的相位同步。所述锁相环回路通过比较外部信号的相位和由压控晶振(VCXO)的相位来实现 同步，在比较的过程中，锁相环回路会不断根据外部信号的相位来调整本地晶振的时钟相位，直到两个信号的相位同步。所述锁相环回路用于振荡器中的反馈技术。许多电子设备要正常工作，通常需要外部的输入信号与内部的振荡信号同步。一般的晶振由于工艺与成本原因，做不到很高的频率，而在需要高频应用时，由相应的压控振荡器221实现转成高频，但并不稳定，故利用锁相环回路就可以实现稳定且高频的时钟信号。
可以理解的，所述锁相环回路用来快速同步到对应的接收频段，譬如800MHZ、900MHZ、1800MHZ、1900MHZ、2100MHZ、2300MHZ、2600MHZ等，锁相环频段的切换和滤波模块4中的第一射频开关40、第二射频开关41保持一致，频段切换时切换到同一频段上，使得接收模块1可以准确接收到相应频段的无线信号。
在本实施例中，所述基带信号处理单元21，具体可以是FPGA，所述FPGA的程序中内置多个不同带宽的成形滤波器及相应的速率转换模块，所述数字信号通过直接数字控制器(DDC，Direct Digital Control)后，通过信号特征识别出通信制式，根据现网信号不同的制式情况，在相应的发射通道发射不同频率三角波，以起到屏蔽作用。可以理解的，不同制式的现网信号最佳的扫描频率为先验知识，可以预先存储在所述基带信号处理单元21中。具体地，所述基带信号处理单元21还用于动态调节扫频频率的起始边界。由于各地运营商布网进度不一致，在同一个频段呈现较大差异，例如经济发达地区老的通信制式已经部分重耕，欠发达地区还没有布网等；设备出厂时，按照规划频段最大的情况来设计，因此所述基带信号处理单元21工作时，所述接收单元20的放大器耦合连接到基带，基带信号处理单元21检测该通道的输出功率以调节扫频频率的起始边界。
可以理解的，所述基带信号处理单元21用于识别所述现网信号起始频率以及截止频率，以调节所述屏蔽信号边界。示例性地，所述屏蔽信号生成单元22的调制滤波器222滤除压控振荡器221扫频产生的杂散和谐波，由于板级的声表或者介质滤波器的过渡带都较宽，对扫频边界产生10MHz左右无法抑制的扫频干扰，且部分运营商之间的上下行间隔只有5MHz，譬如下行频段869～880MHz和上行频段885-915MHz，下行频段1805～1880MHz和上行频段1885～1920MHz的情况，所以需要精确控制屏蔽信号的边界。具体地，对于频分双工(FDD，Frequency Division Duplexing)制式和时分双工(TDD，Time Division Duplexing)制式的现网信号，所述基带信号处理单元21控制数模转换器220，使数模转换器220输出恒定最低电平V1，此时压控振荡器221输出对应频段的最低电平，再反馈到基带，基带比较反馈回来的最低电平和现网信号中识别出的最低电平做差值比较，根据差值再调节数模转换器220的最低电平，直到反馈的最低电平和现网信号的最低电平在预设的误差范围内，以校准低频点边界。示例性地，所述基带信号处理单元21还用于控制数模转换器220，使数模转换器220输出恒定最高电平V2，此时压控振荡器221输出对应频段的最高电平，再反馈到基带，基带比较反馈回来的最高电平和现网信号中识别出的最高电平做差值比较，根据差值再调节 数模转换器220的最高电平，直到反馈的最高电平和现网信号的最高电平在预设的误差范围内，以校准高频点边界。具体地，如果屏蔽信号由多个不连续频段组成，则中间频段的起始和截止点也加入动态校准范围内。另外，定时循环校准扫频边界使得扫频源同步到本地时钟，而本地时钟由于同步到基站，则相当于扫频源间接同步到基站。上述控制方法解决了传统屏蔽器温漂严重，实际边界比需要屏蔽频段的边界大10M左右的困扰，并且由于智能识别现网情况，扫频能量利用率高，提高了干扰效率。
示例性地，所述基带信号处理单元21还用于接收所述调制信号调制的屏蔽信号，并基于所述屏蔽信号调节所述调制信号，以调节所述屏蔽信号的边界。可以理解的，所述信号放大器224同时与所述基带信号处理单元相连，将所述屏蔽信号发送给所述基带信号处理单元，所述基带信号处理单元21基于所述屏蔽信号调节所述调制信号，以调节所述屏蔽信号的边界。具体地，所述基带信号处理单元21把屏蔽信号的实际边界和接收模块20解析的基站信号边界进行比较，根据误差，微调数模转换器220校准压控振荡器221形成的偏差。
示例性地，所述基带信号处理单元21还用于解析时分双工制式的现网信号的开关信号，以使所述屏蔽信号在时分双工制式的现网信号下行时发送，以避免影响基站上行。
其中，对于时分双工制式的信号，还通过解析得到频率误差，频率误差用来校准本地的VCTCXO振荡器，使本地时钟同步到基站。
具体地，所述基带信号处理单元21通过解析无线信号，计算出本地VCTCXO时钟和基站直接的频率误差，再由内部调压电路调整VCTCXO的压控端，定期校准操作，使得设备频率和基站保持同步。由于VCTCXO是设备本地的基准时钟，同步到基站后，设备可以实现精准高质量的时钟信号。
请参阅图6，图6为本申请一实施例的屏蔽信号生成单元22的示意图。在本实施例中，所述屏蔽信号生成单元22包括数模转换器220、压控振荡器221、调制滤波器222、以及调制放大器，所述数模转换器220、压控振荡器221、调制滤波器222、以及调制放大器依次相连，所述数模转换器220与所述基带信号处理单元21相连，所述调制放大器与所述发射模块相连。其中所述数模转换器220将所述基带信号处理单元21传输的数字信号转换为模拟信号，即调制波形，经压控振荡器221、调制滤波器222以及调制放大器处理后生成屏蔽信号，通过调制放大器将屏蔽信号传输给所述发射单元。示例性地，所述调制放大器包括数字可变增益放大器223和信号放大器224，用于根据所述现网信号的强度调节所述屏蔽信号的强度。具体地，所述基带信号处理单元21根据制式识别和边界识别，控制数模转换器220生成相应的波形来控制压控振荡器221产生相应的波形和边界。
具体地，如果同一频段内，存在多种制式的现网信号，则所述数模转换器220输出混合处理的调制波形。请参阅图7，图7为本申请一实施例的针对不同通信制式现网信号的扫频控制的示意图，横轴代表时间，纵轴代表幅度，电压V1～V2代表一种制式的低频点到高频 率的扫频过程，电压V2～V3代表另一种制式的低频点到高频率的扫频过程，纵轴可以看到前后的频率变化。
可以理解的，所述屏蔽信号生成单元22可以包括多条屏蔽通道，每条通道均包括数模转换器220、压控振荡器221、调制滤波器222以及调制放大器，并可在控制器的控制下生成对不同频率、不同制式的现网信号进行屏蔽的屏蔽信号。
示例性地，所述发射模块包括发射天线阵列，包含所有运营商频段的下行。
请参阅图8，图8为本申请一实施例的信号屏蔽装置的结构框图。
与前述实施例不同的是，在本实施例中，所述屏蔽信号生成单元22包括两条屏蔽通道，可在控制器的控制下生成对不同频率、不同制式的现网信号进行屏蔽的屏蔽信号。在其它实施例中，所述屏蔽信号生成单元可以包括多条屏蔽通道。
在本实施例中，所述调制模块2还包括时钟单元，所述时钟单元与所述基带信号处理单元相连，用于与所述基带信号处理单元中数字信号的频率进行同步。
在本实施例中，所述调制模块2还包括监控单元，所述监控单元与所述接收单元、基带信号处理单元、屏蔽信号生成单元以及时钟单元均相连，用于对所述调制模块2的工作进行监控及调试控制。可以理解的，所述监控单元可以为ARM处理器，也可以为其它处理芯片。
请参阅图9，图9为本申请一实施例的监控单元的联网拓扑图。示例性地，云服务器通过互联网与交换机相连，交换机通过局域网与屏蔽装置相连，云服务器通过交换机监控屏蔽装置的工作状况。
本申请还公开了一种信号屏蔽方法，应用于上述信号屏蔽装置。
请参阅图10，图10为本申请一实施例的信号屏蔽方法的示意图。
在本实施例中，所述信号屏蔽方法包括：
步骤900，接收现网信号。
步骤910，识别所述现网信号的通信制式、起始频率以及截止频率，并基于所述现网信号生成调制信号。
具体地，接收所述接收模块传输的现网信号，并识别所述现网信号的通信制式、起始频率以及截止频率，以调制频率、边界与所述现网信号相适应的屏蔽信号。
步骤920，基于所述调制信号调制屏蔽信号。
可以理解的，所述屏蔽信号与所述现网信号的通信制式、频率与边界相适应。
具体地，所述基于所述调制信号调制屏蔽信号包括：将所述调制信号转换为模拟信号；调节所述模拟信号的电压；对所述模拟信号进行滤波；调节所述模拟信号的强度，生成屏蔽信号。
步骤930，发射所述屏蔽信号。
上述信号屏蔽装置及方法包括接收模块1、调制模块2以及发射模块3，其中：接收模块1，用于接收现网信号调制模块2，与所述接收模块1相连，用于接收所述接收模块1传输的现网信号，并基于所述现网信号的通信制式调制屏蔽信号；发射模块，与所述调制模块2相连，用于发射所述屏蔽信号，因此能够根据现网信号的变化调整屏蔽信号，不需要针对不同制式的现网信号设置不同屏蔽电路，屏蔽效率较高，成本较低。同时，所述信号屏蔽装置能循环解析和刷新TDD开关，把解析出来的TDD开关，作为相应TDD干扰通道的使能开关信号，以在在TDD频段关断相应TDD通道的上行，避免干扰运营商基站。并且所述信号屏蔽装置的扫频边界精准，可避免扫频信号落到上行带内，扫频能量利用率高，一定程度地提高了干扰效率。另外，所述信号屏蔽装置利用反馈链路，在FPGA内部定时校准扫频边界，克服压控振荡器221温漂过大的问题。同时，所述信号屏蔽装置的每个发射通道都由DVGA动态调整，根据现网信号强度，可做到遇强则强、遇弱则弱，合理控制屏蔽效果边界。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。

Claims (19)

  1. 一种信号屏蔽装置，其特征在于，所述信号屏蔽装置包括接收模块、调制模块以及发射模块，所述接收模块、调制模块以及发射模块依次相连，其中：
    接收模块，用于接收现网信号；
    调制模块，用于接收所述接收模块传输的现网信号，并基于所述现网信号的通信制式调制屏蔽信号；其中所述基于现网信号的通信制式调制屏蔽信号还包括识别现网信号制式，基于扫频频率干扰效果最优的先验知识针对不同现网信号制式生成对应的调制信号，并基于所述调制信号生成屏蔽信号；
    发射模块，用于发射所述屏蔽信号。
  2. 根据权利要求1所述的信号屏蔽装置，其特征在于，所述调制模块包括接收单元、基带信号处理单元以及屏蔽信号生成单元，其中，所述接收单元与所述接收模块相连，所述接收单元、基带信号处理单元以及屏蔽信号生成单元依次相连，所述屏蔽信号生成单元与所述发射模块相连，所述接收单元用于接收所述接收模块传输的现网信号并转换为数字信号，所述基带信号处理单元接收所述数字信号并基于所述数字信号生成调制信号，所述屏蔽信号生成单元用于基于所述调制信号调制屏蔽信号并将所述屏蔽信号传输给所述发射模块。
  3. 根据权利要求2所述的信号屏蔽装置，其特征在于，所述基带信号处理单元还用于识别所述现网信号起始频率以及截止频率，以调节所述屏蔽信号边界。
  4. 根据权利要求3所述的信号屏蔽装置，其特征在于，所述基带信号处理信号还用于对由多个不连续频段组成的屏蔽信号，调节所述屏蔽信号的边界以及中间频段的起始频率和截止频率。
  5. 根据权利要求3或4所述的信号屏蔽装置，其特征在于，所述屏蔽信号生成单元包括数模转换器、压控振荡器、调制滤波器以及调制放大器，所述数模转换器、压控振荡器、调制滤波器以及调制放大器依次相连，所述数模转换器与所述基带信号处理单元相连，所述调制放大器与所述发射模块相连，所述基带信号处理单元基于所述现网信号的制式和边界，控制所述数模转换器生成相应的波形来控制所述压控振荡器产生相应的波形和边界，并将所述波形通过调制滤波器以及调制放大器处理后生成屏蔽信号。
  6. 根据权利要求4所述的信号屏蔽装置，其特征在于，所述基带信号处理单元还用于接收所述调制信号调制的屏蔽信号，并基于所述屏蔽信号调节所述调制信号，以调节所述屏蔽信号的边界。
  7. 根据权利要求6所述的信号屏蔽装置，其特征在于，所述基带信号处理单元把所述屏蔽信号的边界和现网信号的边界进行比较，根据误差，调节所述数模转换器的输出波形，以调节所述屏蔽信号的边界，校准压控振荡器形成的误差。
  8. 根据权利要求6或7所述的信号屏蔽装置，其特征在于，所述基带信号处理单元还用 于解析时分双工制式的现网信号的开关信号，以使所述屏蔽信号在时分双工制式的现网信号下行时发送。
  9. 根据权利要求2所述的信号屏蔽装置，其特征在于，所述接收单元包括接收放大器、混频器、接收滤波器以及模数转换器，所述接收放大器、混频器、接收滤波器以及模数转换器依次相连，所述接收放大器与所述接收模块相连，所述模数转换器与所述基带信号处理单元相连，所述混频器包括锁相环回路。
  10. 根据权利要求9所述的信号屏蔽装置，其特征在于，所述信号屏蔽装置还包括滤波模块，所述滤波模块设置于所述接收模块与所述调制模块之间，用于对不同频段的现网信号分别进行滤波。
  11. 根据权利要求10所述的信号屏蔽装置，其特征在于，所述滤波模块包括第一射频开关、第二射频开关以及滤波结构，所述第一射频开关、滤波结构以及第二射频开关依次相连，所述第一射频开关与所述接收模块相连，所述第二射频开关与所述调制模块相连，所述第一射频开关与所述第二射频开关同步切换到同一频段。
  12. 根据权利要求11所述的信号屏蔽装置，其特征在于，所述滤波结构包括至少一个滤波单元，各个所述滤波单元覆盖的频率范围不重叠；所述滤波结构通过分时切换遍历所有频段，采集现网信号并且分析。
  13. 根据权利要求11所述的信号屏蔽装置，其特征在于，所述第一射频开关和所述第二射频开关与所述锁相环回路的频段切换保持一致。
  14. 根据权利要求2所述的信号屏蔽装置，其特征在于，所述调制模块还包括监控单元，所述监控单元与所述基带信号处理单元相连，用于监控所述调制模块的运行状况。
  15. 根据权利要求2所述的信号屏蔽装置，其特征在于，所述调制模块还包括时钟单元，所述时钟单元与所述基带信号处理单元相连，用于与所述基带信号处理单元中数字信号的频率进行同步。
  16. 根据权利要求15所述的信号屏蔽装置，其特征在于，所述基带信号处理单元还用于解析时分双工制式的频率误差，以使所述时钟单元同步到基站。
  17. 根据权利要求1所述的信号屏蔽装置，其特征在于，所述调制模块还包括数字可变增益放大器，用于根据所述现网信号的强度调节所述屏蔽信号的强度。
  18. 一种信号屏蔽方法，应用于如权利要求1至17中任意一项所述的信号屏蔽装置，其特征在于，所述方法包括：
    接收现网信号；
    识别所述现网信号的通信制式、起始频率以及截止频率，并基于所述现网信号生成调制信号；
    基于所述调制信号调制屏蔽信号；
    发射所述屏蔽信号。
  19. 根据权利要求18所述的信号屏蔽方法，其特征在于，所述基于所述调制信号调制屏蔽信号包括：
    将所述调制信号转换为模拟信号；
    调节所述模拟信号的电压；
    对所述模拟信号进行滤波；
    调节所述模拟信号的强度，生成屏蔽信号。
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