CN113242106A - Radio communication interference device and adaptive interference method - Google Patents

Radio communication interference device and adaptive interference method Download PDF

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CN113242106A
CN113242106A CN202110506751.0A CN202110506751A CN113242106A CN 113242106 A CN113242106 A CN 113242106A CN 202110506751 A CN202110506751 A CN 202110506751A CN 113242106 A CN113242106 A CN 113242106A
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interference
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communication
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CN113242106B (en
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陈水平
陈代满
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Shenzhen Zhengjiang Communication Technology Co ltd
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Shenzhen Zhengjiang Communication Technology Co ltd
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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
    • 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 provides a radio communication interference device, which comprises a detection guide module, an optimal interference signal generation module and a transmitting module, wherein the detection guide module is connected with the optimal interference signal generation module in a communication way; the detection guide module is used for acquiring a communication signal needing interference, acquiring technical characteristic parameters from the communication signal according to a preset method and obtaining an interference decision according to the technical characteristic parameters; the optimal interference signal generation module is used for outputting an interference signal according to the interference decision; the transmitting module is used for transmitting the interference signal, and the invention further provides a self-adaptive interference method which achieves the effect of not needing to manually set the interference signal.

Description

Radio communication interference device and adaptive interference method
Technical Field
The invention belongs to the technical field of radio communication interference, and particularly relates to a radio communication interference device and a self-adaptive interference method.
Background
Radio communication interference refers to interference that occurs during radio communication. The electromagnetic energy enters a receiving system or a receiving channel in a direct coupling or indirect coupling mode, so that the quality of a useful receiving signal is reduced, and the information of the receiving signal generates errors, thereby achieving the aim of blocking wireless communication. The existing radio communication interference device comprises a signal source module, a power supply module, an amplifier module and a transmitting module, wherein the power supply module is used for supplying power to the signal source module and the amplifier module, the output end of the signal source module is electrically connected to the input end of the amplifier module, and the output end of the amplifier module is electrically connected to the input end of the transmitting module. The signal source module sends an interference signal with a certain frequency to the amplifier module, the amplifier module reinforces the interference signal sent by the signal source module, and the sending module covers the reinforced interference signal in a certain range. For a radio communication interference device, an interference signal sent by a signal source module of the radio communication interference device is usually preset and set manually, so that an interfering useful signal is fixed, and when other useful signals need to be interfered, the radio communication interference device cannot be used for interference.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problem that the existing interference signal is usually preset and set manually, the radio communication interference device and the self-adaptive interference method are provided.
In order to solve the above technical problem, in one aspect, an embodiment of the present invention provides a radio communication interference apparatus, including a probing guiding module, an optimal interference signal generating module and a transmitting module, where the probing guiding module is communicatively connected to the optimal interference signal generating module, and the optimal interference signal generating module is communicatively connected to the transmitting module;
the detection guide module is used for acquiring a communication signal needing interference, acquiring technical characteristic parameters from the communication signal according to a preset method, and obtaining an interference decision according to the technical characteristic parameters;
the optimal interference signal generation module is used for outputting an interference signal according to the interference decision;
the transmitting module is used for transmitting the interference signal.
Optionally, the investigation guiding module comprises a receiving antenna, a feature extraction unit and a classification identification unit; the receiving antenna is used for receiving the communication signals in the environment;
the feature extraction unit is configured to obtain the technical feature parameters from the communication signal according to the preset method, where the technical feature parameters include a time domain feature, a transform domain feature, a carrier frequency, a signal level, a bandwidth, a symbol rate, and a symbol rate;
the feature extraction unit is used for obtaining an interference decision according to the technical feature parameters.
Optionally, the preset method includes a time domain feature method or/and a transform domain feature method, and the feature extraction unit is configured to obtain the technical feature parameter from the communication signal according to the time domain feature method or/and the transform domain feature method.
Optionally, the digital signal generating module is configured to receive and generate an optimal interference digital signal according to the interference decision;
the digital signal processing module is used for carrying out peak clipping processing, digital filtering and gain processing on the optimal interference digital signal to obtain a processed signal;
the DAC module is used for performing digital-to-analog conversion on the processing signal to obtain an analog signal;
the orthogonal up-conversion module is used for processing the analog signal to obtain the interference signal.
Optionally, the optimal interference signal module further includes a signal amplification module, and the signal amplification module is configured to perform enhancement processing on the interference signal.
Optionally, the radio communication interference apparatus further comprises a monitoring module, wherein the monitoring module is electrically connected to the probing guiding module and the optimal interference signal generating module;
the monitoring module is used for suspending the transmission of the interference signal after the interference signal is transmitted for a preset time interval;
detecting whether an interfered signal disappears, and if the interfered signal disappears, keeping the transmission of the interference signal suspended; and if the interfered signal does not disappear, controlling to transmit the interference signal.
According to the radio communication interference device provided by the embodiment of the invention, the interference signal does not need to be preset manually, and the interference signal can be generated automatically. The corresponding interference signals are generated according to different communication signals, and the use universality of the radio communication interference device is improved.
In another aspect, an embodiment of the present invention provides a method for adaptive interference, where the method includes the following steps:
automatically acquiring a communication signal needing interference, acquiring technical characteristic parameters from the communication signal according to a preset method, and obtaining an interference decision according to the technical characteristic parameters;
outputting an interference signal according to the interference decision;
and transmitting the interference signal.
Optionally, the automatically acquiring a communication signal that needs to be interfered, acquiring a technical characteristic parameter from the communication signal according to a preset method, and obtaining an interference decision according to the technical characteristic parameter includes the following steps:
receiving the communication signal in an environment;
acquiring the technical characteristic parameters from the communication signals according to the preset method, wherein the technical characteristic parameters comprise time domain characteristics, transform domain characteristics, carrier frequency, signal level, bandwidth, code element rate and symbol rate;
and obtaining an interference decision according to the technical characteristic parameters.
Optionally, in the outputting an interference signal according to the interference decision, the following steps are included:
receiving and generating an optimal interference digital signal according to the interference decision;
carrying out peak clipping processing, digital filtering and gain processing on the optimal interference digital signal modulation signal to obtain a processed signal;
performing digital-to-analog conversion on the processed signal to obtain an analog signal;
and performing up-conversion and filtering processing on the analog signal to obtain the interference signal.
Optionally, after the transmitting the interference signal, the method further includes the following steps:
suspending transmission of the interference signal after a preset time interval of transmission of the interference signal;
detecting whether an interfered signal disappears, and if the interfered signal disappears, keeping the transmission of the interference signal suspended; and if the interfered signal does not disappear, controlling to transmit the interference signal.
According to the self-adaptive interference method provided by the embodiment of the invention, the interference signal does not need to be preset manually, and the interference signal can be generated automatically. And corresponding interference signals are generated according to different communication signals, so that the use universality of the self-adaptive interference method is improved.
Drawings
Fig. 1 is a schematic structural diagram of a radio communication interference apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a probing guiding module of a radio communication interference apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an optimal interference signal generation mode of a radio communication interference apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a digital signal generating module of a radio communication interference apparatus according to an embodiment of the present invention;
fig. 5 is a first flowchart illustrating an adaptive interference method according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating a second adaptive interference method according to an embodiment of the present invention;
fig. 7 is a third schematic flowchart of an adaptive interference method according to an embodiment of the present invention;
fig. 8 is a fourth schematic flowchart of an adaptive interference method according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a decision tree structure of an adaptive interference method according to an embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
1. a detection guide module; 11. a receiving antenna; 12. a feature extraction unit; 13. a classification recognition unit; 14. a low noise unit; 15. detecting a quadrature down-conversion unit; 16. an adjustable low-pass filtering unit; 17. an ADC unit; 18. a digital preprocessing unit; 19. a spectrum estimation unit; 2. an optimal interference signal generation module; 21. a digital signal generation module; 211. a first random noise signal generation unit; 212. a second random noise signal generation unit; 213. a simple signal generating unit; 214. a complex signal generating unit; 215. a signal synthesizing unit; 216. a custom waveform loading unit; 22. a digital signal processing module; 23. a DAC module; 24. a quadrature up-conversion module; 3. a transmitting module; 4. a monitoring module; 5. a control unit; 6. a communication unit; 7. a clock unit; 9. a power supply unit; 10. and a signal amplification module.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a radio communication interference apparatus according to an embodiment of the present invention includes a probing guide module 1, an optimal interference signal generating module 2, and a transmitting module 3, wherein the probing guide module 1 is communicatively connected to the optimal interference signal generating module 2, and the optimal interference signal generating module 2 is communicatively connected to the transmitting module 3;
the detection guide module 1 is used for acquiring a communication signal needing interference, acquiring technical characteristic parameters from the communication signal according to a preset method, and obtaining an interference decision according to the technical characteristic parameters;
the optimal interference signal generating module 2 is used for outputting an interference signal according to the interference decision;
the transmitting module 3 is used for transmitting interference signals.
Compared with the prior art, the radio communication interference device provided by the invention does not need to manually preset interference signals and can automatically generate the interference signals. The corresponding interference signals are generated according to different communication signals, and the use universality of the radio communication interference device is improved.
Specifically, the investigation guiding module 1 is an investigation guiding device or an investigation guiding chip. The best interference signal generating module 2 is a best interference signal generating device or a best interference signal generating chip. The transmitting module 3 is a transmitting chip or a transmitting device.
Specifically, the transmitting module 3 includes a power amplifier and an antenna feeder, an input terminal of the power amplifier is connected to an output terminal of the optimum interference signal generating module, and the antenna feeder is connected to an output terminal of the power amplifier.
In one embodiment, as shown in fig. 2, the scout guiding module 1 includes a receiving antenna 11, a feature extracting unit 12 and a classification identifying unit 13;
the receiving antenna 11 is used for receiving communication signals in the environment;
the feature extraction unit 12 is configured to obtain technical feature parameters from the communication signal according to a preset method, where the technical feature parameters include a time domain feature, a transform domain feature, a carrier frequency, a signal level, a bandwidth, a symbol rate, and a symbol rate;
the feature extraction unit 12 is configured to obtain an interference decision according to the technical feature parameters.
And obtaining an interference decision according to the time domain characteristics, the transform domain characteristics, the carrier frequency, the signal level, the bandwidth, the code element rate and the symbol rate, so that the interference decision is more accurate and reasonable.
In one embodiment, as shown in fig. 2, the detection guiding module 1 further includes a signal conversion unit, the signal conversion unit includes a low noise unit 14, a detection quadrature down-conversion unit 15, an adjustable low-pass filtering unit 16, an ADC unit 17, a digital preprocessing unit 18 and a spectrum estimation unit 19, an output terminal of the receiving antenna 11 is connected to an input terminal of the low noise unit 14, an output terminal of the low noise unit 14 is connected to an input terminal of the detection quadrature down-conversion unit 15, an output terminal of the detection quadrature down-conversion unit 15 is connected to an input terminal of the adjustable low-pass filtering unit 16, the output end of the adjustable low-pass filtering unit 16 is connected to the input end of the ADC unit 17, the output end of the ADC unit 17 is connected to the input end of the digital preprocessing unit 18, the output end of the digital preprocessing unit 18 is connected to the input end of the spectrum estimation unit 19, and the output end of the spectrum estimation unit 19 is connected to the feature extraction unit 12. The communication signal is converted into a digital signal with accurate representation through the signal conversion unit, and the interference accuracy of the radio communication interference device is improved. The digital preprocessing unit 18 obtains the parameter set by separating and parameter-estimating the input signal of the ADC unit 17, thereby facilitating the one-step parameter analysis of the communication signal. The spectrum estimation unit 19 is used to perform an accurate analysis of the spectrum of the input signal of the digital preprocessing unit 18 in order to accurately measure the frequency of the communication signal.
Specifically, the spectrum estimation unit 19 is an FPGA chip or a DSP chip dedicated to an FFT algorithm, where the FFT algorithm is a fast fourier transform algorithm, the FPGA chip is a field programmable gate array chip, and the DSP chip is a digital signal processing chip.
In an embodiment, the preset method includes a time domain feature method or/and a transform domain feature method, and the feature extraction unit 12 is configured to obtain the technical feature parameter from the communication signal according to the time domain feature method or/and the transform domain feature method.
Because the technical characteristic parameters comprise parameters such as time domain characteristics, transform domain characteristics, carrier frequency, signal level, bandwidth, code element rate, symbol rate and the like, in order to obtain the most accurate data of each parameter in the technical characteristic parameters, any one of a time domain characteristic method and a transform domain characteristic method can be selected to obtain the most accurate data when each parameter is calculated, for example, the time domain characteristics are obtained most suitably by adopting the time domain characteristic method, and the device adopts the time domain characteristic method to obtain the data of the time domain characteristics; the symbol rate is most suitably obtained by using a transform domain characterization method, and the apparatus uses the transform domain characterization method to obtain the symbol rate.
In one embodiment, as shown in fig. 1 and fig. 3, the optimal interference signal module includes a digital signal generating module 21, a digital signal processing module 22, a DAC module 23, and a quadrature up-conversion module 24;
the digital signal generating module 21 is configured to receive and generate an optimal interference digital signal according to the interference decision;
the digital signal processing module 22 is configured to perform peak clipping, digital filtering, and gain processing on the optimal interference digital signal to obtain a processed signal;
the DAC module 23 is configured to perform digital-to-analog conversion on the processed signal to obtain an analog signal;
the orthogonal up-conversion module 24 is configured to process the analog signal to obtain an interference signal.
In an embodiment, the digital signal generating module 21 is configured to receive the interference decision and automatically generate a random noise signal, and generate an optimal interference digital signal according to the interference decision and the random noise signal.
And modulating the random noise signal into an optimal interference signal according to the interference decision obtained by detection and reception without human intervention, thereby realizing the self-adaptive generation of the interference signal.
Specifically, the random noise signal is generated by a preset random noise signal generation program.
Specifically, as shown in fig. 4, the digital signal generating module 21 includes a first random noise signal generating unit 211, a second random noise signal generating unit 212, a simple signal generating unit 213, a complex signal generating unit 214, and a signal synthesizing unit 215, the first random noise signal generating unit 211 and the second random noise signal generating unit 212 are each configured to generate a random noise signal, the simple signal generating unit 213 is configured to generate a simple signal from the interference decision and the random noise signal output by the first random noise signal generating unit, the complex signal generating unit 214 is configured to generate a complex signal from the interference decision and the random noise signal output by the second random noise signal generating unit, and the signal synthesizing unit 215 is configured to generate an optimal interference digital signal from the simple signal and the complex signal. The output terminal of the first random noise signal generating unit 211 is connected to the input terminal of the simple signal generating unit 213, the output terminal of the simple signal generating unit 213 is connected to the input terminal of the signal synthesizing unit 215, the output terminal of the second random noise signal generating unit 212 is connected to the input terminal of the complex signal generating unit 214, the output terminal of the complex signal generating unit 214 is connected to the input terminal of the signal synthesizing unit 215, and the output terminal of the signal synthesizing unit 215 is connected to the digital signal processing module 22.
Preferably, the simple signal includes at least one of an AM signal, an FM signal, an ASK signal, an FSK signal, and a PSK signal. The complex signal includes at least one of an OFDM signal, an LTE signal, a WCDMA signal, and a CDMA signal.
Preferably, the digital signal generating module 21 further comprises a custom waveform loading unit 216, and the custom waveform loading unit 216 is used for inputting complex signals or/and simple signals. The output terminal of the custom waveform loading unit 216 is connected to the input terminal of the signal synthesizing unit 215.
In an embodiment, as shown in fig. 1, the optimal interference signal module further includes a signal amplification module 10, and the signal amplification module 10 is configured to perform enhancement processing on the interference signal to improve the signal strength of the interference signal.
In one embodiment, as shown in fig. 1, the radio communication interference apparatus further includes a monitoring module 4, wherein the monitoring module 4 is electrically connected to the detection guidance module 1 and the optimal interference signal generation module 2;
the monitoring module 4 is used for suspending transmitting the interference signal after the interference signal is transmitted for a preset time interval;
detecting whether the interfered signal disappears, and if the interfered signal disappears, keeping the transmission of the interference signal suspended; and if the interfered signal does not disappear, controlling to transmit the interference signal.
If the interfered signal disappears, the radio communication interference device is proved to receive the interference signal sent by the radio communication interference device to perform interference, and at the moment, the radio communication interference device is stopped to work. If the interfered signal does not disappear, the radio communication interference device is proved to be normally operated, namely the radio communication interference device interferes the correct interfered signal, and the radio communication interference device is enabled to normally operate.
In an embodiment, the monitoring module 4 is further configured to determine whether the interfered signal transfers a channel if the interfered signal does not disappear, adjust the frequency of the interfering signal if the interfered signal transfers the channel, and control to transmit the interfering signal with the adjusted frequency; and if the interfered signal does not transfer the channel, controlling to transmit the interference signal.
The device can judge whether parameters of the interfered signals are changed or not while judging whether normal interference is carried out, and continuous interference on the interfered signals is guaranteed.
In one embodiment, as shown in fig. 1, the radio communication interference apparatus further includes a control unit 5, a communication unit 6, a clock unit 7 and a power supply unit 9, wherein the power supply unit 9 is configured to supply power to the communication unit 6, the control unit 5, the clock unit 7, the monitoring module 4, the detection guidance module 1, the optimal interference signal generation module 2 and the signal amplification module 10; the control unit 5 is used for controlling the communication unit 6, the clock unit 7, the monitoring module 4, the detection guide module 1, the optimal interference signal generation module 2 and the signal amplification module 10 to work; the clock unit 7 is used for providing an execution standard for providing a radio communication interference device; the communication unit 6 is used for realizing communication between the radio communication interference device and external equipment.
Specifically, the control unit 5 is a control chip or a control device. The communication unit 6 is a communication chip or a communication device. The clock unit 7 is a clock chip or clock device. The power supply unit 9 is a power supply management chip or a power supply management device.
As shown in fig. 5, the present invention further provides an adaptive interference method, which includes the following steps: s1: automatically acquiring a communication signal needing interference, acquiring technical characteristic parameters from the communication signal according to a preset method, and obtaining an interference decision according to the technical characteristic parameters;
s2: outputting an interference signal according to the interference decision;
s3: and transmitting the interference signal.
And realizing the self-adaptive generation of the interference signal.
In one embodiment, as shown in fig. 6, in step S1, the method includes the following steps:
s11, receiving the communication signal in the environment;
s12, acquiring the technical characteristic parameters from the communication signals according to the preset method, wherein the technical characteristic parameters comprise time domain characteristics, transform domain characteristics, carrier frequency, signal level, bandwidth, code element rate and symbol rate;
and S13, obtaining an interference decision according to the technical characteristic parameters.
And obtaining an interference decision according to the time domain characteristics, the transform domain characteristics, the carrier frequency, the signal level, the bandwidth, the code element rate and the symbol rate, so that the interference decision is more accurate and reasonable.
Specifically, an interference decision is obtained according to the technical feature parameters and the decision tree structure.
Preferably, the decision tree structure employs a structure of joint recognition of classifier analog and digital modulation.
Preferably, before the structure identified by the combination of classifier simulation and digital modulation is used, the technical feature parameters are processed to obtain 9 basic feature parameters, wherein the 9 basic feature parameters are as follows: peak value gamma of amplitude spectrummaxAbsolute phase standard deviation sigmaapDirect phase standard deviation sigmadpSpectral symmetry P, absolute amplitude standard deviation σaaAbsolute frequency standard deviation σafStandard deviation of amplitude σaAmplitude peak value
Figure BDA0003058696210000101
Sum frequency peak
Figure BDA0003058696210000102
More preferably, the peak value gamma of the amplitude spectrummaxCan be determined by a first formula: gamma raymax＝max|FFT[acn(i)]2,/Ns | was obtained.
In the first formula, Ns is the number of sampling points, acn(i) Normalized instantaneous amplitude for zero center, acn(i) Calculated by the second formula: a iscn(i)＝an(i) -1, in a second formula:
Figure BDA0003058696210000103
while
Figure BDA0003058696210000104
The purpose of normalizing the instantaneous amplitude a (i) by the average value of the instantaneous amplitude a (i) is to eliminate the effect of channel gain. Peak value gamma of amplitude spectrummaxMainly for distinguishing FM signals, DSB signals or AM-FM signals, since the instantaneous amplitude of an FM signal is constant, the zero-centered normalized instantaneous amplitude a of an FM signalcn(i) The spectral density of the corresponding FM signal is also zero at 0. Whereas for the DSB signal and the AM-FM signal, the DSB signal and the AM-FM signal are zero since the instantaneous amplitudes of the two signals are not constant valuesCentral normalized instantaneous amplitude acn(i) I.e. not zero, and the spectral density of the corresponding DSB signal and AM-FM signal is not zero. Of course, in practical cases, it cannot be expressed as γmaxA decision threshold is set as a boundary (threshold) for discriminating FM signal, DSB signal and AM-FM signal, and t (gamma) is usedmax) The decision rule is as follows:
γmax≤t(γmax) Judging as FM signals; gamma > t (gamma)max) The signal is judged to be a DSB signal or an AM-FM signal.
The FSK signal, ASK signal and PSK signal are distinguished in the digitally modulated signal, because the instantaneous amplitude of the FSK signal is constant, the zero-centered normalized instantaneous amplitude of the FSK signal is zero, i.e. gammamax≤t(γmax) For distinguishing whether it is a DSB signal or an AM-FM signal. The ASK signal contains envelope information, and the zero center normalized instantaneous amplitude is not zero, so gamma is more than t (gamma)max). The PSK signal also contains amplitude variation information, i.e., γ > t (γ), because the PSK signal has abrupt amplitude changes at the time of phase variation due to the limitation of the channel bandwidthmax). So using gammamaxIt is possible to distinguish FSK signals from other digitally modulated signals.
More preferably, the standard deviation sigma of the absolute phaseapCan be derived from a third formula.
Wherein the third formula is:
Figure BDA0003058696210000111
wherein, atIs the first threshold of the normalized instantaneous amplitude, when An(i) If the data is larger than the first threshold, the data at the moment can be considered to belong to a strong signal segment, otherwise, the data belong to a weak signal segment. In weak signal segments, the instantaneous phase is very sensitive to noise. And C is the data number in the strong signal segment.
Figure BDA0003058696210000112
Is the nonlinear component of the instantaneous phase after zero-centering. When the carriers are completely synchronized, at this time
Figure BDA0003058696210000113
Wherein the content of the first and second substances,
Figure BDA0003058696210000114
Figure BDA0003058696210000115
ns is the number of sampling points for the instantaneous phase.
Absolute phase standard deviation sigmaapTo distinguish between DSB signals and AM-FM signals. Because of DSB signals
Figure BDA0003058696210000116
So that no absolute value phase information, i.e. the absolute phase standard deviation sigma, is contained for the DSB signal ap0, and absolute value phase information, i.e. the standard deviation sigma of the absolute phase, for AM-FM signalsapNot equal to 0, so that by choosing a suitable second threshold t (σ)ap) Can be used for the absolute phase standard deviation sigmaapThe DSB signal and the AM-FM signal are distinguished.
Absolute phase standard deviation sigmaapIt is also possible to distinguish between 4PSK signals, 2PSK signals and ASK signals in the digital modulated signal. Since no phase information is contained in the ASK signal, σap＜t(σap). Because the 2PSK signal has only two phase values, the zero center normalized phase absolute value is also constant, and the 2PSK signal does not contain phase information, so that the sigma is also satisfiedap＜t(σap). For a 4PSK signal, the absolute value of the zero-center normalized phase of the 4PSK signal is not constant because the instantaneous phase has four values, and σ isap＞t(σap)。
More preferably, the direct phase standard deviation σdpMay be represented by a fourth formula:
Figure BDA0003058696210000117
thus obtaining the product. Wherein a istIs the third threshold of the normalized instantaneous amplitude, when An(i) If the data is larger than the third threshold, the data at the moment can be considered to belong to a strong signal segment, otherwise, the data belong to a weak signal segment. In weak signal segments, the instantaneous phase is very sensitive to noiseFeeling is felt. C is the number of data in the strong signal segment,
Figure BDA0003058696210000118
is the nonlinear component of the instantaneous phase after zero-centering.
Direct phase standard deviation sigmadpStandard deviation sigma from absolute phaseapThe difference is that the latter is the standard deviation of the absolute value of the phase, while the former is the standard deviation of the direct phase (non-absolute phase). Direct phase standard deviation sigmadpMainly for distinguishing AM signals without direct phase information, VSB signals without direct phase information, DSB signals with direct phase information, LSB signals with direct phase information, USB signals with direct phase information, and AM-FM signals with direct phase information, with a decision threshold set to t (sigma)dp). Using direct phase standard deviation sigma in digitally modulated signalsdpTo distinguish ASK signals from 2PSK signals, since there is no direct phase information for ASK signals, i.e. sigma dp0. While the 2PSK signal contains direct phase information, the instantaneous phase of which takes on 0 or pi, so sigmadp≠0。
More preferably, the spectral symmetry P can be represented by the fifth formula:
Figure BDA0003058696210000121
thus obtaining the product. In the fifth formula:
Figure BDA0003058696210000122
fcn＝Ns*fc/fs-1; the s (i) ═ FFT (s (n)) is the fourier transform of the signal s (n). f. ofcIs a carrier wave, fsFor the sampling rate, Ns is the number of sampling points, P parameter is a measure of the symmetry of the signal spectrum, and is mainly used to distinguish between signals whose spectrum satisfies symmetry and signals whose spectrum does not satisfy symmetry, and the decision threshold is set as t (P).
More preferably, the absolute amplitude standard deviation σaaIs the standard deviation of the normalized zero-center instantaneous amplitude absolute value, referred to as the absolute amplitude standard deviation for short. It is defined similarly to the absolute phase standard deviation. Standard deviation of absolute amplitude sigmaaaCan be used for dredgingA sixth formula:
Figure BDA0003058696210000123
thus obtaining the product.
In the sixth formula, NsTo count the number of samples, acn(i) Normalized instantaneous amplitude at zero center. SigmaaaMainly to distinguish between 2ASK signals and 4ASK signals. Since its absolute value of amplitude is constant for a 2ASK signal, and contains no amplitude information, it has aaaThe absolute value of the amplitude for a 4ASK signal is not constant but still contains amplitude information, so σ is 0aaNot equal to 0. Suppose that its decision threshold is t (σ)aa)。
More preferably, the standard deviation σ of absolute frequencyafIs the standard deviation of the absolute value of the normalized zero-center instantaneous frequency, referred to as the absolute amplitude standard deviation for short. It is defined similarly to the absolute phase standard deviation, i.e. the absolute frequency standard deviation σafMay be represented by a seventh formula:
Figure BDA0003058696210000124
thus obtaining the product.
In the seventh formula, the first and second groups are,
Figure BDA0003058696210000125
fmU)＝f(i)-mf
Figure BDA0003058696210000126
in that
Figure BDA0003058696210000127
In, RsIs the symbol rate of the digital signal, and f (i) is the instantaneous frequency of the signal. SigmaafTo distinguish whether it is a 2FSK signal or a 4FSK signal. Since the instantaneous frequency of a 2FSK signal has only two values, the absolute value of its zero-center normalized instantaneous frequency is constant, and its standard deviation σ isaf0, whereas for a 4FSK signal the absolute value of its zero-center normalized instantaneous frequency is not constant, since it has four values for its instantaneous frequency, so σafNot equal to 0, so σ can be usedafTo distinguish two digital signals of 2FSK and 4FSK, the decision threshold is set as t (sigma)af)。
More preferably, the standard deviation σ of the amplitudesaMay be determined by an eighth equation:
Figure BDA0003058696210000131
thus obtaining the product.
In the eighth formula, atIs to judge an amplitude decision threshold level, a, of the weak signal segmentcn(i) Normalized instantaneous amplitude for zero center, c is total sample data, NsThe number of the non-weak signal values in the middle is. SigmaaMainly for distinguishing DSB signals from 2PSK signals, and also for distinguishing AM-FM signals from 4PSK signals. Since there is no amplitude modulation information for 2PSK and 4PSK signals, σ a0. For DSB signals or AM-FM signals, amplitude modulation information is contained, so sigmaaNot equal to 0. Thus, a suitable decision threshold t (sigma) can be seta) To distinguish the DSB signal [ sigma ]a＞t(σa)]Or 2PSK signal [ sigma ]a＜t(σa)]Or for discriminating between AM-FM signals [ sigma ]a＞t(σa)]Or 4PSK signal [ sigma ]a＜t(σa]。
Preferably, amplitude peak
Figure BDA0003058696210000132
Is a statistical parameter based on instantaneous amplitude. Peak amplitude
Figure BDA0003058696210000133
May be calculated by the ninth formula:
Figure BDA0003058696210000134
thus obtaining the product.
In the ninth formula: a iscn(i) Normalizing the instantaneous amplitude for a zero center; the notation E {. is a statistical average.
Peak amplitude
Figure BDA0003058696210000135
Mainly for distinguishingAM signal and ASK signal, i.e. to distinguish between analog amplitude modulation and digital amplitude modulation. Because of the higher compactness to the instantaneous amplitude of the AM signal, i.e.
Figure BDA0003058696210000136
The value is large, and the compactness of the ASK signal is poor due to only 2 or 4 level values, namely
Figure BDA0003058696210000137
The value is small. So that it is possible to set a suitable threshold
Figure BDA0003058696210000138
To judge that is AM signal
Figure BDA0003058696210000139
And ASK signal
Figure BDA00030586962100001310
Preferably, frequency peak
Figure BDA00030586962100001311
Is a statistical parameter based on instantaneous frequency, which is represented by the tenth formula:
Figure BDA0003058696210000141
thus obtaining the product.
In the tenth formula, in the first embodiment,
Figure BDA0003058696210000142
fm(i)＝f(i)-mf；
Figure BDA0003058696210000143
in that
Figure BDA0003058696210000144
Where f (i) is the instantaneous frequency of the signal and the symbol E {. is the statistical average.
Peak value of frequency
Figure BDA0003058696210000145
The method is mainly used for distinguishing FM signals or FSK signals, namely distinguishing analog frequency modulation signals or digital frequency modulation signals. Because of the higher compactness of the instantaneous frequency of the FM signal, i.e.
Figure BDA0003058696210000146
The value is large, and the instantaneous frequency of the FSK signal is only 2 or 4, and the compactness is poor
Figure BDA0003058696210000147
Is smaller. So that it is possible to set a suitable threshold
Figure BDA0003058696210000148
To judge that it is an FM signal
Figure BDA0003058696210000149
Or is an FSK signal
Figure BDA00030586962100001410
Using the peak value gamma of the amplitude spectrummaxAbsolute phase standard deviation sigmaapDirect phase standard deviation sigmadpSpectral symmetry P, absolute amplitude standard deviation σaaAbsolute frequency standard deviation σafStandard deviation of amplitude σaAmplitude peak value
Figure BDA00030586962100001411
Sum frequency peak
Figure BDA00030586962100001412
A decision tree structure as in fig. 9 is obtained.
In one embodiment, as shown in fig. 7, in step S2, the method includes the following steps:
s21, receiving and generating the best interference digital signal according to the interference decision;
s22, performing peak clipping processing, digital filtering and gain processing on the optimal interference digital signal modulation signal to obtain a processed signal;
s23, carrying out digital-to-analog conversion on the processed signal to obtain an analog signal;
and S24, performing up-conversion and filtering processing on the analog signal to obtain the interference signal.
In an embodiment, as shown in fig. 4, after step S3, the method further includes the following steps:
s4, stopping transmitting the interference signal after the interference signal is transmitted for a preset time interval;
s5, detecting whether the interfered signal disappears, if so, keeping the transmission of the interference signal; and if the interfered signal does not disappear, controlling to transmit the interference signal.
If the interfered signal disappears, the self-adaptive interference method is proved to receive the interference signal sent by the self-adaptive interference method for interference. If the interfered signal does not disappear, the self-adaptive interference method is proved to be normally interfered, namely the self-adaptive interference method interferes the correct interfered signal.
In one embodiment, as shown in fig. 8, the step S5 includes the following steps:
s51: detecting whether an interfered signal disappears, and if the interfered signal disappears, keeping the transmission of the interference signal suspended; if the interfered signal does not disappear, judging whether the interfered signal transfers a channel;
s52: judging whether the interfered signal is transferred to other frequencies, if so, adjusting the frequency of the interference signal and controlling to transmit the interference signal with the adjusted frequency; and if the interfered signal is not transferred to other frequencies, controlling to transmit the interference signal.
The method can judge whether the parameters of the interfered signals are changed while judging whether normal interference is carried out, and the continuous interference on the interfered signals is guaranteed to be effective.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A radio communication interference device is characterized by comprising a detection guide module, an optimal interference signal generation module and a transmitting module, wherein the detection guide module is connected with the optimal interference signal generation module in a communication way, and the optimal interference signal generation module is connected with the transmitting module in a communication way;
the detection guide module is used for acquiring a communication signal needing interference, acquiring technical characteristic parameters from the communication signal according to a preset method, and obtaining an interference decision according to the technical characteristic parameters;
the optimal interference signal generation module is used for outputting an interference signal according to the interference decision;
the transmitting module is used for transmitting the interference signal.
2. The radio communication interference device according to claim 1, wherein the scout guide module comprises a receiving antenna, a feature extraction unit and a classification identification unit;
the receiving antenna is used for receiving the communication signals in the environment;
the feature extraction unit is configured to obtain the technical feature parameters from the communication signal according to the preset method, where the technical feature parameters include a time domain feature, a transform domain feature, a carrier frequency, a signal level, a bandwidth, a symbol rate, and a symbol rate;
the feature extraction unit is used for obtaining an interference decision according to the technical feature parameters.
3. The radio communication interference apparatus according to claim 2, wherein the preset method comprises a time domain characterization method or/and a transform domain characterization method, and the feature extraction unit is configured to obtain the technical feature parameter from the communication signal according to the time domain characterization method or/and the transform domain characterization method.
4. The radio communication interference apparatus according to claim 1, wherein the optimal interference signal module comprises a digital signal generation module, a digital signal processing module, a DAC module, and a quadrature up-conversion module;
the digital signal generating module is used for receiving and generating an optimal interference digital signal according to the interference decision;
the digital signal processing module is used for carrying out peak clipping processing, digital filtering and gain processing on the optimal interference digital signal to obtain a processed signal;
the DAC module is used for performing digital-to-analog conversion on the processing signal to obtain an analog signal;
the orthogonal up-conversion module is used for processing the analog signal to obtain the interference signal.
5. The radio communication interference apparatus according to claim 4, wherein the optimal interference signal module further comprises a signal amplification module, and the signal amplification module is configured to perform enhancement processing on the interference signal.
6. The wireless communication jamming device of claim 1, wherein the wireless communication jamming device further comprises a monitoring module electrically connected to the probing guiding module and the optimal jamming signal generating module;
the monitoring module is used for suspending the transmission of the interference signal after the interference signal is transmitted for a preset time interval;
detecting whether an interfered signal disappears, and if the interfered signal disappears, keeping the transmission of the interference signal suspended; and if the interfered signal does not disappear, controlling to transmit the interference signal.
7. An adaptive interference method, characterized in that the method comprises the steps of:
automatically acquiring a communication signal needing interference, acquiring technical characteristic parameters from the communication signal according to a preset method, and obtaining an interference decision according to the technical characteristic parameters;
outputting an interference signal according to the interference decision;
and transmitting the interference signal.
8. The adaptive interference method according to claim 7, wherein the step of automatically acquiring the communication signal to be interfered, acquiring the technical characteristic parameters from the communication signal according to a preset method, and obtaining the interference decision according to the technical characteristic parameters comprises the following steps:
receiving the communication signal in an environment;
acquiring the technical characteristic parameters from the communication signals according to the preset method, wherein the technical characteristic parameters comprise time domain characteristics, transform domain characteristics, carrier frequency, signal level, bandwidth, code element rate and symbol rate;
and obtaining an interference decision according to the technical characteristic parameters.
9. The adaptive interference method according to claim 7, comprising the steps of, in said outputting an interference signal based on said interference decision:
receiving and generating an optimal interference digital signal according to the interference decision;
carrying out peak clipping processing, digital filtering and gain processing on the optimal interference digital signal modulation signal to obtain a processed signal;
performing digital-to-analog conversion on the processed signal to obtain an analog signal;
and performing up-conversion and filtering processing on the analog signal to obtain the interference signal.
10. The adaptive interference method of claim 7 further comprising, after said transmitting said interfering signal, the steps of:
suspending transmission of the interference signal after a preset time interval of transmission of the interference signal;
detecting whether an interfered signal disappears, and if the interfered signal disappears, keeping the transmission of the interference signal suspended; and if the interfered signal does not disappear, controlling to transmit the interference signal.
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