CN113242106B - Radio communication interference device and adaptive interference method - Google Patents
Radio communication interference device and adaptive interference method Download PDFInfo
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- CN113242106B CN113242106B CN202110506751.0A CN202110506751A CN113242106B CN 113242106 B CN113242106 B CN 113242106B CN 202110506751 A CN202110506751 A CN 202110506751A CN 113242106 B CN113242106 B CN 113242106B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention provides a radio communication interference device, which comprises a detection guiding module, an optimal interference signal generating module and a transmitting module, wherein the detection guiding module is in communication connection with the optimal interference signal generating module, and the optimal interference signal generating module is in communication connection with the transmitting module; the detection guiding module is used for acquiring a communication signal to be interfered according to a preset method, acquiring technical characteristic parameters from the communication signal, and acquiring 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 self-adaptive interference method provided by the invention achieves the effect of not needing to manually set the interference signal.
Description
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 what 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 useful received signals is reduced, and the information of the received signals is error, thereby achieving the purpose of blocking wireless communication. The prior 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 with the input end of the amplifier module, and the output end of the amplifier module is electrically connected with 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 enhances the interference signal sent by the signal source module, and the sending module covers the enhanced interference signal in a certain range. In a radio communication interference device, an interference signal transmitted by a signal source module of the radio communication interference device is usually preset manually, so that an interference 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 problems to be solved by the invention are as follows: aiming at the problem that the existing interference signals are usually preset manually, a radio communication interference device and an adaptive interference method are provided.
In order to solve the above technical problems, in one aspect, an embodiment of the present invention provides a radio communication interference device, including a detection guiding module, an optimal interference signal generating module and a transmitting module, where the detection 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 acquiring 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 detection guiding module comprises a receiving antenna, a feature extraction unit and a classification and identification unit; the receiving antenna is used for receiving the communication signals in the environment;
the characteristic extraction unit is configured to obtain the technical characteristic parameter from the communication signal according to the preset method, where the technical characteristic parameter includes a time domain characteristic, a transform domain characteristic, 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 signals to obtain analog signals;
the quadrature up-conversion module is used for processing the analog signal to obtain the interference signal.
Optionally, the optimal interference signal module further comprises a signal amplification module, and the signal amplification module is used for performing enhancement processing on the interference signal.
Optionally, the radio communication interference device further includes a monitoring module, and the monitoring module is electrically connected to the detection guiding module and the optimal interference signal generating module;
the monitoring module is used for suspending transmitting the interference signal after the interference signal is transmitted for a preset time interval;
detecting whether an interfered signal disappears, and if so, keeping suspending transmitting the interfered signal; and if the interfered signal does not disappear, controlling to transmit the interfered signal.
According to the radio communication interference device provided by the embodiment of the invention, the interference signal can be automatically generated without manually presetting the interference signal. Corresponding interference signals are generated according to different communication signals, so that the use universality of the radio communication interference device is improved.
In another aspect, an embodiment of the present invention provides an adaptive interference method, including the steps of:
automatically acquiring a communication signal to be interfered, acquiring technical characteristic parameters from the communication signal according to a preset method, and acquiring an interference decision according to the technical characteristic parameters;
outputting an interference signal according to the interference decision;
transmitting the interference signal.
Optionally, in the automatically acquiring the communication signal to be interfered, acquiring a technical feature parameter from the communication signal according to a preset method, and obtaining an interference decision according to the technical feature parameter, the method includes the following steps:
receiving the communication signal in an environment;
acquiring the technical characteristic parameters from the communication signal 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 of the interference signal according to the interference decision, the method includes the steps of:
receiving and generating an optimal interference digital signal according to the interference decision;
performing peak clipping, digital filtering and gain processing on the optimal interference digital signal modulation signal to obtain a processing signal;
performing digital-to-analog conversion on the processing signal to obtain an analog signal;
and carrying out up-conversion and filtering processing on the analog signal to obtain the interference signal.
Optionally, after said transmitting the interference signal, the method further comprises the steps of:
suspending transmitting the interference signal after the interference signal is transmitted for a preset time interval;
detecting whether an interfered signal disappears, and if so, keeping suspending transmitting the interfered signal; and if the interfered signal does not disappear, controlling to transmit the interfered signal.
According to the self-adaptive interference method provided by the embodiment of the invention, the interference signal can be automatically generated without manually presetting the interference signal. 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 device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a detection guiding module of a radio communication interference device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an optimal interference signal generating module of a radio communication interference device 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 device according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of an adaptive interference method according to an embodiment of the present invention;
fig. 6 is a second flow chart of an adaptive interference method according to an embodiment of the present invention;
fig. 7 is a flowchart of a self-adaptive interference method according to an embodiment of the present invention;
fig. 8 is a flow chart diagram of a self-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, each reference sign in the figure:
1. a detection guide module; 11. a receiving antenna; 12. a feature extraction unit; 13. a classification and identification unit; 14. a low noise unit; 15. detecting the 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. an orthogonal 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 amplifying module.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the 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 for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, a radio communication interference device provided by an embodiment of the present invention includes a detection guiding module 1, an optimal interference signal generating module 2 and a transmitting module 3, where the detection guiding 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 and guide module 1 is used for acquiring communication signals needing interference, acquiring technical characteristic parameters from the communication signals according to a preset method, and acquiring interference decisions according to the technical characteristic parameters;
the optimal interference signal generation 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 an interference signal and can automatically generate the interference signal. Corresponding interference signals are generated according to different communication signals, so that 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-disturbance signal generation module 2 is a best-disturbance signal generation device or best-disturbance signal generation chip. The transmitting module 3 is a transmitting chip or transmitting device.
In particular, the transmitting module 3 comprises a power amplifier, the input of which is connected to the output of the optimal interference signal generating module, and an antenna feed, which is connected to the output of the power amplifier.
In an embodiment, as shown in fig. 2, the investigation guiding module 1 comprises a receiving antenna 11, a feature extraction unit 12 and a classification recognition 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 parameter.
And obtaining an interference decision according to the time domain characteristics, the transformation 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 an embodiment, as shown in fig. 2, the detection guiding module 1 further includes a signal conversion unit, where 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 end of the receiving antenna 11 is connected to an input end of the low noise unit 14, an output end of the low noise unit 14 is connected to an input end of the detection quadrature down-conversion unit 15, an output end of the detection quadrature down-conversion unit 15 is connected to an input end of the adjustable low-pass filtering unit 16, an output end of the adjustable low-pass filtering unit 16 is connected to an input end of the ADC unit 17, an output end of the ADC unit 17 is connected to an input end of the digital preprocessing unit 18, an output end of the digital preprocessing unit 18 is connected to an input end of the spectrum estimation unit 19, and an 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, so that the interference accuracy of the radio communication interference device is improved. The digital preprocessing unit 18 obtains a parameter set by separating and parameter estimating the input signal of the ADC unit 17, thereby facilitating one-step parameter analysis of the communication signal. The spectrum estimation unit 19 is used for accurately analyzing 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 the FFT algorithm, wherein 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 technical feature parameters from the communication signal according to the time domain feature method or/and the transform domain feature method.
Because the technical feature parameters include parameters such as time domain feature, transform domain feature, carrier frequency, signal level, bandwidth, symbol rate and symbol rate, in order to obtain the most accurate data of each parameter in the technical feature parameters, any one of the time domain feature method and the transform domain feature method can be selected to obtain when each parameter is calculated, for example, the time domain feature is obtained most appropriately by adopting the time domain feature method, and the device adopts the time domain feature method to obtain the data of the time domain feature; the device uses the transform domain feature to obtain the symbol rate.
In one embodiment, as shown in fig. 1 and 3, the optimal interference signal module includes a digital signal generation 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 quadrature up-conversion module 24 is configured to process the analog signal to obtain an interference signal.
In one 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 type interference signal according to the interference decision obtained by detection and reception without human intervention, so as to realize 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, each of the first random noise signal generating unit 211 and the second random noise signal generating unit 212 is configured to generate a random noise signal, the simple signal generating unit 213 is configured to generate a simple signal from an interference decision and the random noise signal outputted from 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 outputted from 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 end of the first random noise signal generating unit 211 is connected to the input end of the simple signal generating unit 213, the output end of the simple signal generating unit 213 is connected to the input end of the signal synthesizing unit 215, the output end of the second random noise signal generating unit 212 is connected to the input end of the complex signal generating unit 214, the output end of the complex signal generating unit 214 is connected to the input end of the signal synthesizing unit 215, and the output end 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 of the custom waveform loading unit 216 is connected to the input of the signal synthesizing unit 215.
In an embodiment, as shown in fig. 1, the optimal interference signal module further includes a signal amplifying module 10, where the signal amplifying module 10 is configured to perform enhancement processing on the interference signal, and improve the signal strength of the interference signal.
In one embodiment, as shown in fig. 1, the radio communication interference device further includes a monitoring module 4, where the monitoring module 4 is electrically connected to the detection guiding module 1 and the optimal interference signal generating 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 so, keeping suspending transmitting the interfered signal; and if the interfered signal does not disappear, controlling to transmit the interfered 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 carry out interference, and the radio communication interference device is stopped at the moment. If the interfered signal does not disappear, the radio communication interference device is proved to work normally, namely the radio communication interference device interferes with the correct interfered signal, so that the radio communication interference device works normally.
In an embodiment, the monitoring module 4 is further configured to determine whether the interfered signal is diverted, if the interfered signal is not disappeared, and if the interfered signal is diverted, adjust the frequency of the interfering signal, and control to transmit the interfering signal with the adjusted frequency; and if the interfered signal does not have a transfer channel, controlling to transmit the interfered signal.
The device can judge whether the parameters of the interfered signal change while judging whether normal interference is carried out, so as to ensure continuous interference on the interfered signal.
In one embodiment, as shown in fig. 1, the radio communication interference device further includes a control unit 5, a communication unit 6, a clock unit 7, and a power supply unit 9, where 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 guiding module 1, the optimal interference signal generating module 2, and the signal amplifying module 10; the control unit 5 is used for controlling the communication unit 6, the clock unit 7, the monitoring module 4, the investigation guiding module 1, the optimal interference signal generating module 2 and the signal amplifying 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 to realize communication of the radio communication interference device with an external device.
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 a clock device. The power supply unit 9 is a power management chip or a power 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 to be interfered, acquiring technical characteristic parameters from the communication signal according to a preset method, and acquiring an interference decision according to the technical characteristic parameters;
s2: outputting an interference signal according to the interference decision;
s3: transmitting the interference signal.
The adaptive generation of the interference signal is realized.
In one embodiment, as shown in fig. 6, in step S1, the following steps are included:
s11, receiving the communication signal in the environment;
s12, acquiring the technical characteristic parameters from the communication signal 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 transformation 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 characteristic parameters and the decision tree structure.
Preferably, the decision tree structure employs a structure of joint recognition of classifier analog and digital modulations.
Preferably, before using the structure of the combined recognition of the analog and digital modulation of the classifier, 9 basic feature parameters are obtained by processing the technical feature parameters, and the 9 basic feature parameters are: peak value gamma of amplitude spectrum max Standard deviation sigma of absolute phase ap Standard deviation sigma of direct phase dp Spectral symmetry P, absolute amplitude standard deviation sigma aa Standard deviation sigma of absolute frequency af Standard deviation sigma of amplitude a Peak amplitude
And frequency peak->
Preferably, the amplitude spectrum peaksγ max The first formula can be passed: gamma ray max ＝max|FFT[a cn (i)] 2 and/Ns|.
In the first formula, ns is the number of sampling points, a cn (i) Instantaneous amplitude normalized to zero center, a cn (i) Calculated from a second formula: a, a cn (i)＝a n (i) -1, in a second formula:
but->
The purpose of normalizing the instantaneous amplitude a (i) with the average value of the instantaneous amplitude a (i) is to eliminate the influence of the channel gain. Peak value gamma of amplitude spectrum max Mainly for distinguishing between FM signals, DSB signals or AM-FM signals, the zero centre of the FM signal normalizing the instantaneous amplitude a because the instantaneous amplitude is constant for the FM signals cn (i) =0, the spectral density of the corresponding FM signal is also zero. Whereas for DSB and AM-FM signals, the zero centers of the DSB and AM-FM signals normalize the instantaneous amplitude a because the instantaneous amplitudes of the two signals are not constant cn (i) I.e., non-zero, the spectral densities of the corresponding DSB signal and AM-FM signal are also non-zero. Of course in actual conditions, not in gamma max =0 as a boundary (threshold) for discriminating FM signal, DSB signal and AM-FM signal, and a decision threshold is set by t (γ max ) To express, the decision rule is as follows:
γ max ≤t(γ max ) Judging as an FM signal; gamma > t (gamma) max ) The signal is determined as a DSB signal or an AM-FM signal.
Distinguishing between FSK, ASK and PSK signals in digitally modulated signals, the zero-centered normalized instantaneous amplitude of the FSK signal being zero, i.e. gamma, because the instantaneous amplitude is constant for the FSK signal max ≤t(γ max ) For distinguishing between DSB signals and AM-FM signals. For ASK signal, because it contains envelope information, its zero center normalized instantaneous amplitude is not zero, so that gamma is greater than t (gamma max ). PSK signal due to channel receptionBandwidth limitations, PSK signals will produce amplitude jumps at phase change instants, so PSK signals also contain amplitude change information, i.e., gamma > t (gamma max ). So use gamma max The FSK signal may be distinguished from other digitally modulated signals.
Preferably, the absolute phase standard deviation sigma ap Can be obtained by a third formula.
Wherein, the third formula is:
wherein a is t Is the first threshold of normalized instantaneous amplitude, when A n (i) When 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 belongs to a weak signal segment. In weak signal segments, the instantaneous phase is very sensitive to noise. C is the number of data in the strong signal segment. />
Is the nonlinear component of the instantaneous phase after zero-centering processing. When the carriers are completely synchronized, at this time +.>
Wherein, the liquid crystal display device comprises a liquid crystal display device,
for instantaneous phase, ns is the number of samples.
Standard deviation sigma of absolute phase ap For distinguishing between DSB signals and AM-FM signals. Because of DSB signal
So that the DSB signal does not contain absolute value phase information, i.e. absolute phase standard deviation sigma ap =0, and contains absolute value phase information, i.e. absolute phase standard deviation σ, for AM-FM signals ap Not equal to 0, by selecting a suitable second threshold t (sigma ap ) Can be used for the absolute phase standard deviation sigma ap The DSB signal is distinguished from the AM-FM signal.
Standard deviation sigma of absolute phase ap In the digitally modulated signal can also be used to distinguish between a 4PSK signal, a 2PSK signal and an ASK signal. Sigma because no phase information is contained for ASK signals ap ＜t(σ ap ). Because the 2PSK signal has only two phase values, the absolute value of the zero center normalized phase is also constant, and the 2PSK signal does not contain phase information, thereby also meeting the sigma ap ＜t(σ ap ). For 4PSK signals, the instantaneous phase of the 4PSK signal has four values, so the absolute value of the zero center normalized phase is not constant, and sigma is present ap ＞t(σ ap )。
More preferably, the direct phase standard deviation sigma dp The fourth formula can be passed:
Direct phase standard deviation sigma dp Standard deviation sigma from absolute phase ap The difference is that the latter is the standard deviation of the absolute value of the phase, whereas the former is the standard deviation of the direct phase (not the absolute value phase). Direct phase standard deviation sigma dp 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, the decision threshold is set to t (sigma dp ). Using direct phase standard deviation sigma in digitally modulated signals dp To distinguish ASK signals from 2PSK signals, because forASK signal without direct phase information, i.e. sigma dp =0. Whereas 2PSK signals contain direct phase information whose instantaneous phase takes 0 or pi, so sigma dp ≠0。
More preferably, the spectral symmetry P can be calculated by the fifth formula:
obtained. In the fifth formula:
f cn ＝N s *f c /f s -1; s (i) =fft (S (n)) is the fourier transform of signal S (n). f (f) c Is carrier wave, f s For the sampling rate, ns is the number of sampling points, and the P parameter is a measure of symmetry of the signal spectrum, and is mainly used for distinguishing the signal whose spectrum meets the symmetry and the signal whose spectrum does not meet the symmetry, and setting the decision threshold as t (P).
Preferably, the absolute amplitude standard deviation sigma aa Is the standard deviation of the absolute value of the normalized zero center instantaneous amplitude, which is simply called absolute amplitude standard deviation. Which is defined similarly to the absolute phase standard deviation. Standard deviation sigma of absolute amplitude aa The sixth formula can be passed:
obtained.
In the sixth formula, N s For sampling point number a cn (i) The instantaneous amplitude normalized for the zero center. Sigma (sigma) aa The method is mainly used for distinguishing a 2ASK signal from a 4ASK signal. Since the absolute value of the amplitude is a constant for a 2ASK signal, and no amplitude information is contained, there is sigma aa =0, whereas the absolute value of the amplitude for the 4ASK signal is not constant, but still contains amplitude information, so σ aa Not equal to 0. Assuming that the decision threshold is t (sigma aa )。
Preferably, the absolute frequency standard deviation sigma af Is the standard deviation of the absolute value of the normalized zero center instantaneous frequency, and is simply called absolute amplitude standard deviation. Which is defined similarly to the absolute phase standard deviation, i.e. the absolute frequency standard deviation sigma af Can pass through the seventh formula：
Obtained.
In the seventh expression of the present invention,
f m U)＝f(i)-m f />
at the position of
Wherein R is s The symbol rate of the digital signal, f (i) is the instantaneous frequency of the signal. Sigma (sigma) af To distinguish between a 2FSK signal and a 4FSK signal. Since for a 2FSK signal its instantaneous frequency has only two values, its absolute value of zero center normalized instantaneous frequency is constant, its standard deviation sigma af =0, whereas for a 4FSK signal its zero center normalized instantaneous frequency has an absolute value that is not constant, so σ, due to its four values af Not equal to 0, so sigma can be used af To distinguish two digital signals of 2FSK and 4FSK, and set the decision threshold as t (sigma af )。
More preferably, the standard deviation sigma of the amplitude a The following can be obtained by the eighth formula:
obtained.
In the eighth formula, a t Is an amplitude decision threshold level, a, for determining weak signal segments cn (i) Normalizing the instantaneous amplitude for zero center, c is the total sampled data, N s Belongs to the number of non-weak signal values. Sigma (sigma) a Mainly for distinguishing between DSB signals and 2PSK signals, and also for distinguishing between AM-FM signals and 4PSK signals. Because there is no amplitude modulation information for 2PSK and 4PSK signals, σ a And 0. Whereas DSB signal or AM-FM signal contains amplitude modulation information, so sigma a Not equal to 0. Thus can pass throughSetting a suitable decision threshold t (sigma a ) To distinguish it as DSB signal [ sigma ] a ＞t(σ a )]Or 2PSK signal [ sigma ] a ＜t(σ a )]Or to distinguish as AM-FM signal [ sigma ] a ＞t(σ a )]Or a 4PSK signal [ sigma ] a ＜t(σ a ]。
Preferably, the amplitude peak
Is a statistical parameter based on instantaneous amplitude. Amplitude peak->
The ninth formula can be passed:
obtained.
In the ninth formula: a, a cn (i) Normalizing the instantaneous amplitude for a zero center; the symbol E {.cndot. } is a statistical average.
Peak amplitude value
The method is mainly used for distinguishing an AM signal from an ASK signal, namely, distinguishing whether the AM signal is analog amplitude modulation or digital amplitude modulation. Because of the higher compactness of the instantaneous amplitude of the AM signal, i.e. +.>
The value is larger, and the ASK signal has poor compactness, namely +.>
The value is small. So that by setting an appropriate threshold +.>
To distinguish AM signal +.>
And ASK signal->
Preferably, the frequency peak
Is a statistical parameter based on instantaneous frequency, which is calculated by a tenth formula: />
Obtained.
In the tenth formula of the present invention,
f m (i)＝f(i)-m f ；/>
at the position of
Where f (i) is the instantaneous frequency of the signal and the symbol E {. Cndot. } is the statistical average.
Peak frequency value
The method is mainly used for distinguishing the FM signal or the FSK signal, namely the analog frequency modulation signal or the digital frequency modulation signal. Because of the high compactness of the instantaneous frequency of the FM signal, i.e. +.>
The value is larger, but the instantaneous frequency of the FSK signal is only 2 or 4, and the compactness is poor, namely +.>
Smaller. So that by setting an appropriate threshold +.>
To distinguish as FM signal->
Or FSK signal->
Using amplitude spectrum peaks gamma max Standard deviation sigma of absolute phase ap Standard deviation sigma of direct phase dp Spectral symmetry P, absolute amplitude standard deviation sigma aa Standard deviation sigma of absolute frequency af Standard deviation sigma of amplitude a Peak amplitude
And frequency peak->
Resulting in a decision tree structure as in fig. 9.
In one embodiment, as shown in fig. 7, in step S2, the following steps are included:
s21, receiving and generating an optimal interference digital signal according to the interference decision;
s22, carrying out peak clipping processing, digital filtering and gain processing on the optimal interference digital signal modulation signal to obtain a processing signal;
s23, performing digital-to-analog conversion on the processing signal to obtain an analog signal;
and S24, carrying out up-conversion and filtering processing on the analog signal to obtain the interference signal.
In one embodiment, as shown in fig. 4, after step S3, the following steps are further included:
s4, suspending transmitting the interference signal after the interference signal is transmitted for a preset time interval;
s5, detecting whether the interfered signal disappears, and if the interfered signal disappears, keeping suspending transmitting the interfered signal; and if the interfered signal does not disappear, controlling to transmit the interfered 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 adaptive interference method is proved to be normally interfered, namely the adaptive interference method interferes with the correct interfered signal.
In one embodiment, as shown in fig. 8, the following steps are included in step S5:
s51: detecting whether an interfered signal disappears, and if so, keeping suspending transmitting the interfered signal; if the interfered signal does not disappear, judging whether the interfered signal is transferred to a channel or not;
s52: judging whether the interfered signal is transferred to other frequencies, if so, adjusting the frequency of the interfered signal, and controlling to transmit the interfered signal with the adjusted frequency; if the interfered signal is not transferred to other frequencies, the transmission of the interfered signal is controlled.
The method can judge whether the parameters of the interfered signal change while judging whether normal interference is carried out, and ensures that continuous interference on the interfered signal is effective.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. The radio communication interference device is characterized by comprising a detection guiding module, an optimal interference signal generating module and a transmitting module, wherein the detection guiding module is in communication connection with the optimal interference signal generating module, and the optimal interference signal generating module is in communication connection with 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 acquiring 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;
the radio communication interference device further comprises a monitoring module, wherein the monitoring module is electrically connected with the investigation guiding module and the optimal interference signal generating module;
the monitoring module is used for suspending transmitting the interference signal after the interference signal is transmitted for a preset time interval;
the monitoring module is also used for detecting whether the interfered signal disappears, and if the interfered signal disappears, the transmission of the interfered signal is kept to be suspended; if the interfered signal does not disappear, controlling to transmit the interfered signal;
the monitoring module is further used for judging whether the interfered signal is transferred to a channel or not if the interfered signal is not disappeared, adjusting the frequency of the interference signal if the interfered signal is transferred to the channel, and controlling to transmit the interference signal with the adjusted frequency; and if the interfered signal does not have a transfer channel, controlling to transmit the interfered signal.
2. The radio communication interference device of claim 1, wherein the scout guidance module comprises a receiving antenna, a feature extraction unit, and a classification recognition unit;
the receiving antenna is used for receiving the communication signals in the environment;
the characteristic extraction unit is configured to obtain the technical characteristic parameter from the communication signal according to the preset method, where the technical characteristic parameter includes a time domain characteristic, a transform domain characteristic, 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 device according to claim 2, wherein the preset method comprises 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.
4. The radio communication interference device of claim 1, wherein the optimal interference signal generation module comprises a digital signal generation module, a digital signal processing module, a DAC module, and a quadrature up-conversion module;
the digital signal generation 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 signals to obtain analog signals;
the quadrature up-conversion module is used for processing the analog signal to obtain the interference signal.
5. The radio communication interference device of claim 4 wherein said optimal interference signal generating module further comprises a signal amplifying module for enhancing said interference signal.
6. A method of adaptive interference, the method comprising the steps of:
automatically acquiring a communication signal to be interfered, acquiring technical characteristic parameters from the communication signal according to a preset method, and acquiring an interference decision according to the technical characteristic parameters;
outputting an interference signal according to the interference decision;
transmitting the interference signal;
after said transmitting said interfering signal, further comprising the steps of:
suspending transmitting the interference signal after the interference signal is transmitted for a preset time interval;
detecting whether an interfered signal disappears, and if so, keeping suspending transmitting the interfered signal; if the interfered signal does not disappear, controlling to transmit the interfered signal;
after the interfered signal does not disappear, the method further comprises the following steps:
detecting whether an interfered signal disappears, and if so, keeping suspending transmitting the interfered signal; if the interfered signal does not disappear, judging whether the interfered signal is transferred to a channel or not;
judging whether the interfered signal is transferred to other frequencies, if so, adjusting the frequency of the interfered signal, and controlling to transmit the interfered signal with the adjusted frequency; if the interfered signal is not transferred to other frequencies, the transmission of the interfered signal is controlled.
7. The adaptive interference method as set forth in claim 6, wherein in the automatically acquiring the communication signal to be interfered, and acquiring the technical feature parameter from the communication signal according to a preset method, the interference decision is obtained according to the technical feature parameter, comprising the steps of:
receiving the communication signal in an environment;
acquiring the technical characteristic parameters from the communication signal 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.
8. The adaptive interference method as claimed in claim 6, wherein in said outputting an interference signal according to said interference decision, comprising the steps of:
receiving and generating an optimal interference digital signal according to the interference decision;
performing peak clipping, digital filtering and gain processing on the optimal interference digital signal modulation signal to obtain a processing signal;
performing digital-to-analog conversion on the processing signal to obtain an analog signal;
and carrying out up-conversion and filtering processing on the analog signal to obtain the interference signal.
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| US6304594B1 (en) * | 1998-07-27 | 2001-10-16 | General Dynamics Government Systems Corporation | Interference detection and avoidance technique |
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| WO2016108449A1 (en) * | 2014-12-30 | 2016-07-07 | 주식회사 쏠리드 | Interference cancellation repeater |
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| US8224234B1 (en) * | 2009-04-16 | 2012-07-17 | Raytheon Company | Method and apparatus for generation of radio frequency jamming signals |
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| CN109004951A (en) * | 2018-08-10 | 2018-12-14 | 北京历正科技有限责任公司 | A kind of UAV Communication interference method and system |
| CN111555837B (en) * | 2020-04-13 | 2023-06-27 | 安徽白鹭电子科技有限公司 | Ultra-short wave communication self-adaptive interference method and system |
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| US6304594B1 (en) * | 1998-07-27 | 2001-10-16 | General Dynamics Government Systems Corporation | Interference detection and avoidance technique |
| CN104811213A (en) * | 2014-01-28 | 2015-07-29 | 华为技术有限公司 | Self-interference signal removing device and method |
| WO2016108449A1 (en) * | 2014-12-30 | 2016-07-07 | 주식회사 쏠리드 | Interference cancellation repeater |
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