Multi-frequency interference system and method

Abstract

An embodiment of the present invention discloses a multi-frequency interference system and method. The multi-frequency interference system includes: a multi-interference signal generating device, a signal processing device, and an antenna; the multi-interference signal generating device is connected to the signal processing device and is configured to generate interference signals of multiple frequencies and superimpose them to generate a radio frequency signal and send it to the signal processing device; the signal processing device is connected to the antenna and is configured to perform signal processing on the radio frequency signal and send it to the antenna; the antenna is configured to externally send the processed radio frequency signal. The embodiment of the present invention can reduce the interference cost and simplify the interference operation of channels.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of communications, and in particular to a multi-frequency interference system and method. Background Art

[0002] With the development of my country's radio industry, the gradual improvement of radio management agencies and the continuous improvement of relevant technical levels, after determining that interference is needed and identifying the frequencies that need interference, timely disposal can be carried out and suppression can be implemented quickly.

[0003] At present, AM broadcast jammers implement interference by using the same-frequency noise or audio on the channel to be interfered in a time-sharing manner. However, this technology can only interfere with one channel to be interfered at a time.

[0004] If multiple channels need to be interfered at the same time, the existing solution is to use multiple sets of independent equipment to implement interference on the channels that need to be interfered. The above method requires a large amount of equipment and is complicated to operate. Summary of the invention

[0005] The embodiments of the present invention provide a multi-frequency interference system and method, which can reduce interference costs and simplify channel interference operations.

[0006] In a first aspect, an embodiment of the present invention provides a multi-frequency interference system, including:

[0007] Multiple interference signal generating device, signal processing device and antenna;

[0008] The multi-interference signal generating device is connected to the signal processing device, and is used to simultaneously generate interference signals of multiple frequencies and superimpose them, and generate a radio frequency signal to send to the signal processing device;

[0009] The signal processing device is connected to the antenna, and is used to process the radio frequency signal and send it to the antenna;

[0010] The antenna is used to send the processed radio frequency signal to the outside.

[0011] In a second aspect, an embodiment of the present invention further provides a multi-frequency interference method, which is applied to a multi-frequency interference system as described in any one of the embodiments of the present invention, comprising:

[0012] Acquire at least two frequencies and interference information corresponding to each of the frequencies;

[0013] respectively generating interference signals matching the frequencies;

[0014] Superimposing the interference signals to obtain a radio frequency signal;

[0015] Transmit the radio frequency signal externally, where the radio frequency signal is used to interfere with each of the original signals having frequency matching.

[0016] In an embodiment of the present invention, a multi-interference signal generation device can generate interference signals of multiple frequencies simultaneously and superimpose them to form a composite signal including multiple frequencies, and transmit it through an antenna, so as to achieve interference with multiple channels simultaneously, solving the problem in the prior art that it is impossible to interfere with multiple channels simultaneously, resulting in a large amount of equipment and high cost required for multi-channel interference. It can generate interference signals of multiple channels and transmit them simultaneously, improving the interference efficiency, reducing the interference cost, and simplifying the interference operation of channels. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of a multi-frequency interference system in an embodiment of the present invention;

[0018] Figure 2 is a schematic structural diagram of a multi-frequency interference system in an embodiment of the present invention;

[0019] Figure 3 is a schematic structural diagram of a multi-frequency interference system in an embodiment of the present invention;

[0020] Figure 4 is a schematic structural diagram of a multi-frequency interference system in an embodiment of the present invention;

[0021] Figure 5 is a flowchart of a multi-frequency interference method in an embodiment of the present invention;

[0022] Figure 6 is a spectrogram of an audio signal in an embodiment of the present invention;

[0023] Figure 7 is a time-domain diagram of a broadcast signal in an embodiment of the present invention;

[0024] Figure 8 is a time-domain diagram of an audio signal in an embodiment of the present invention;

[0025] Figure 9 is a time-domain diagram of a broadcast signal after being interfered by an audio signal in an embodiment of the present invention;

[0026] Figure 10 is a frequency-domain diagram of a broadcast signal in an embodiment of the present invention;

[0027] Figure 11 is a frequency-domain diagram of an audio signal in an embodiment of the present invention;

[0028] Figure 12 is a frequency-domain diagram of a broadcast signal after being interfered by an audio signal in an embodiment of the present invention;

[0029] Figure 13 It is the spectrogram of a noise signal in an embodiment of the present invention;

[0030] Figure 14 It is the time-domain diagram of a noise signal in an embodiment of the present invention;

[0031] Figure 15 It is the time-domain diagram of a broadcast signal after being interfered by a noise signal in an embodiment of the present invention;

[0032] Figure 16 It is the frequency-domain diagram of a noise signal in an embodiment of the present invention;

[0033] Figure 17 It is the frequency-domain diagram of a broadcast signal after being interfered by a noise signal in an embodiment of the present invention. Detailed implementation manners

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the accompanying drawings rather than all structures.

[0035] Embodiment

[0036] Figure 1 It is a schematic diagram of a multi-frequency interference system in an embodiment of the present invention. This embodiment can be applied to the situation of interfering with broadcast signals. As Figure 1 shown, the multi-frequency interference system of this embodiment specifically includes:

[0037] A multi-interference signal generating device 110, a signal processing device 120, and an antenna 130;

[0038] The multi-interference signal generating device 110 is connected to the signal processing device 120, and is used to simultaneously generate interference signals of multiple frequencies and superimpose them to generate a radio frequency signal and send it to the signal processing device 120; the signal processing device 120 is connected to the antenna 130, and is used to perform signal processing on the radio frequency signal and send it to the antenna 130; the antenna 130 is used to externally send the processed radio frequency signal.

[0039] In the application scenario of the multi-frequency interference system in the propagation of broadcast signals, it externally sends radio frequency signals to interfere with the original radio frequency signals of multiple channels. At this time, multi-frequency refers to multiple frequencies (or channels) or multiple frequency ranges.

[0040] The multi-interference signal generating device 110 actually acts as a signal generator, generating signals of multiple frequencies simultaneously and superimposing them to obtain a radio frequency signal. Specifically, the multi-interference signal generating device 110 generates corresponding interference signals for multiple channels respectively and synthesizes them to obtain a radio frequency signal. Specifically, the multi-interference signal generating device 110 is configured with at least two interference sources, and users can set each interference channel respectively according to the actual application effect, with high flexibility and good interference effect.

[0041] Optionally, the multi-interference signal generating device 110 includes an exciter. Among them, the exciter is a harmonic generator for generating high-frequency harmonic signals. Specifically, the multi-interference signal generating device 110 (or the exciter) includes a Field Programmable Gate Array (FPGA) and a Digital to Analog Converter (DAC). Among them, the field programmable gate array FPGA is connected to the digital-to-analog converter. The FPGA is used to generate at least two interference signals and superimpose them to obtain a composite signal. The frequencies of different interference signals are different, and the number of types of interference signals includes at least two. The digital-to-analog converter is used to perform digital-to-analog conversion on the composite signal in digital form to obtain a radio frequency signal in analog form.

[0042] It should be noted that the multi-interference signal generating device 110 also includes other modules, such as a power supply module, a Digital Signal Processing (DSP) module, or a digital-to-analog converter, etc. In this regard, the embodiments of the present invention do not make specific limitations.

[0043] The multi-interference signal generating device 110 receives the input information of the user, determines the identification information of the channels to be interfered and the frequency points of each channel, that is, obtains the frequency information of the signals. It should be noted that during the transmission of broadcast signals, in order to prevent interference between each frequency and generate interference signals that affect the communication quality, each signal frequency has an interval range. Usually, the frequency is divided into intervals and each interval is numbered, that is, the frequency point. More specifically, the frequency point is the midpoint of a frequency range and also the number of a fixed frequency. Usually, the user will specify at least two frequency points. The FPGA in the multi-interference signal generating device 110 generates multiple initial signals according to the received frequency point information, and modulates the initial signals respectively according to the matching modulation parameters to generate multiple modulated signals as interference signals. Then, the FPGA in the multi-interference signal generating device 110 sums up all the interference signals to obtain a composite signal. At this time, the composite signal is a digital signal, and the composite signal is sent to the DAC in the multi-interference signal generating device 110, and the DAC converts the composite signal into an analog signal, that is, a radio frequency signal. At this time, the radio frequency signal includes interference signals corresponding to multiple frequencies or multiple frequency points.

[0044] The signal processing device 120 is used to optimize the interference signals. Optionally, the signal processing device 120 includes: a power amplifier device 210 and a filter device 220. Specifically, as Figure 2 shown, the power amplifier device 210 is respectively connected to the multi-interference signal generating device and the filter device 220, and is used to amplify the radio frequency signal; the filter device 220 is connected to the antenna 130, and is used to filter the amplified radio frequency signal to obtain the processed radio frequency signal and send it to the antenna.

[0045] The power amplifier device 210 is used to amplify the radio frequency signal so that the interference signal is large enough to effectively interfere with the signal to be interfered and ensure the interference effect. The filter device 220 is used to filter the amplified radio frequency signal. Specifically, it filters and suppresses the harmonic components and spurious components in the amplified radio frequency signal to ensure that the output radio frequency signal meets the relevant regulations and requirements of the ITU (International Telecommunication Union).

[0046] Optionally, specifically as Figure 3As shown in the figure, the multi-frequency interference system further includes: a monitoring device 140; the monitoring device 140 is respectively connected to the multi-interference signal generating device 110 and the signal processing device 120, and is used to monitor the multi-interference signal generating device 110 and the signal processing device 120. Specifically, the monitoring device 140 is used to monitor whether the multi-interference signal generating device 110 and the signal processing device 120 have abnormalities, and give an alarm in time, improve the efficiency of exception handling, and protect each device in the multi-frequency interference system. In addition, the alarm method may include a software alarm method and / or a hardware alarm method, etc., to protect the multi-frequency interference system to the greatest extent, improve the reliability and stability of the operation of the multi-frequency interference system. Among them, the software alarm method may include application program notifications. The hardware alarm method may include generating an alarm audio for playback.

[0047] Specifically, the monitoring device 140 communicates with the multi-interference signal generating device 110 and the signal processing device 120 through the CAN bus. In addition, the monitoring device 140 can also communicate with the remote host computer through communication methods such as Ethernet, RS232, and RS485 to achieve remote monitoring.

[0048] Optionally, the multi-frequency interference system further includes: a power supply device 150. The power supply device 150 is connected to the power amplifier device 210 and is used to provide a stable DC power supply for the power amplifier device 210.

[0049] If the signal processing device 120 includes a power amplifier device 210 and a filter device 220, then the monitoring device 140 is connected to the power amplifier device 210 and the filter device 220, specifically as Figure 4 shown. The monitoring device 140 is used to monitor all the electronic devices in the multi-frequency interference system to ensure the normal operation of the multi-frequency interference system.

[0050] In addition, the power supply device 150 is also connected to the monitoring device 140, and the monitoring device 140 is also used to monitor the power supply device 150.

[0051] In the embodiment of the present invention, the multi-interference signal generating device can simultaneously generate interference signals of multiple frequencies and superimpose them to form a composite signal including multiple frequencies, and send it out through the antenna to achieve simultaneous interference on multiple channels, solving the problem in the prior art that it is impossible to simultaneously interfere on multiple channels, resulting in a large amount of equipment and high cost required for multi-channel interference. It can simultaneously generate interference signals of multiple channels and send them, improve the interference efficiency, reduce the interference cost, and simplify the interference operation of the channels.

[0052] Figure 5 It is a flowchart of a multi-frequency interference method in the embodiment of the present invention. This embodiment can be applied to the situation of interfering with broadcast signals. The multi-frequency interference method is applied to the multi-frequency interference system described in any one of the embodiments of the present invention, and includes:

[0053] Specifically, in order to effectively interfere with certain unwanted or unhealthy broadcast signals, interference signals can be selected for interference. Specifically, the interference signals are used to interfere with the broadcast signals, so that users cannot directly obtain the original broadcast signals.

[0054] S110, obtain at least two frequencies and the interference information corresponding to each of the frequencies.

[0055] Specifically, the multi-interference signal generating device in the multi-frequency interference system obtains at least two frequencies and the interference information corresponding to each of the frequencies.

[0056] The frequencies are used to identify channels. Specifically, the frequencies are actually the frequencies corresponding to the frequency points that identify the channels. Specifically, obtaining at least two frequencies can be obtaining at least two frequency points. The interference information is used to generate interference signals, and specifically may include the signal parameters of the interference signals. Exemplarily, the signal parameters may include the operating frequency point or the interference mode, etc.

[0057] The user can determine the identification information of the channels to be interfered, the operating frequency points of each channel, and the interference effect according to the actual application scenario, and sequentially set the operating frequency points and interference modes of each interference channel. Specifically, the above information is input to the multi-interference signal generating device, so that the multi-interference signal generating device generates corresponding interference signals respectively, and after summing and digital-to-analog conversion, a radio frequency signal is generated.

[0058] Optionally, the interference information includes: interference modulation parameters and interference source types, and the interference source types include audio interference types or noise interference types.

[0059] The audio interference type can be an interference signal generated by AM modulating a preset audio signal. Specifically, what is played on the channel to be interfered is a piece of music, voice, or other audio, etc.

[0060] The noise interference type can be an interference signal generated by DSB modulating a noise signal. Specifically, what is played on the channel to be interfered is noise, for example, the background noise of "rustling".

[0061] The interference modulation parameters are used to modulate the initial signal to generate an interference signal, so that the interference signal is sufficient to cover the signal to be interfered. Specifically, the modulation method of the audio signal can be the standard amplitude modulation mode, so that the amplitude of the modulated audio signal is higher than the signal to be interfered. The modulation method of the noise signal can be double-sideband suppressed carrier modulation, so that the effective interference of the modulated noise signal on the signal to be interfered is achieved and power is saved.

[0062] Through the interference information, a matching interference signal can be accurately generated for each channel to improve the interference effect.

[0063] Actually, in the current scenario, interference signals can be emitted for each channel, and signals obtained by superimposing the interference signals and the valid broadcast signals of the channel can be received. Similarity values (the similarity of waveform images can be calculated) of the broadcast signals after interference and the broadcast signals before interference can be calculated respectively from two aspects: time domain and frequency domain, so as to determine the interference signals of the channel. If the similarity is lower than the set threshold, the interference signals can be continuously adjusted according to the preset rules until the interference signals can cover the valid broadcast signals in both the time domain and the frequency domain.

[0064] The preset rules can be a pre-configured set of modulation parameters, and this set includes multiple groups of modulation parameters. Each group of modulation parameters can include at least one of amplitude, angular frequency, phase, etc.

[0065] S120, generate interference signals matching each of the frequencies respectively.

[0066] Specifically, the multi-interference signal generation device in the multi-frequency interference system generates interference signals matching each of the frequencies respectively.

[0067] More specifically, the FPGA in the multi-interference signal generation device acquires or generates an initial signal, and modulates it according to each frequency to obtain interference signals matching each frequency.

[0068] Among them, the types of interference sources for different frequencies can be the same or different, and can be specifically set according to actual needs.

[0069] Optionally, the type of interference source includes an audio interference type; generating the interference signal matching the frequency includes: generating an audio signal; performing amplitude modulation on the audio signal according to the interference modulation parameters matching the frequency to generate the interference signal matching the frequency.

[0070] The audio signal can be audio data pre-stored locally, or can be audio stream data received from other devices.

[0071] In a specific example, the broadcast signal to be interfered with is a standard amplitude modulation signal, and its time domain expression is:

[0072] s AM (t) = [A0 + m0(t)] · cosw c t

[0073] Among them, A0 is the carrier amplitude of the amplitude modulation broadcast signal, w c is the carrier angular frequency of the amplitude modulation broadcast signal, and m0(t) is the baseband modulation signal of the amplitude modulation broadcast signal.

[0074] When the interference source is an audio signal, correspondingly, a standard amplitude modulation signal can be used to interfere with the amplitude modulation broadcast signal, and its time domain expression is:

[0075]

[0076] Among them, A1 is the carrier amplitude of the interference signal, w c is the carrier angular frequency of the interference signal, and m1(t) is the baseband interference modulation signal. is the initial phase of the interference radio frequency signal.

[0077] Exemplarily, the spectrogram of the audio signal is as Figure 6 shown.

[0078] In a specific example, the time-domain diagram of the broadcast signal to be interfered with is as Figure 7 shown, and the time-domain diagram of the modulated audio signal, that is, the interference signal, is as Figure 8 shown. The time-domain diagram of the broadcast signal after interference is as Figure 9 shown. It can be seen that in the time domain, the broadcast signal after interference almost completely covers the broadcast signal before interference. The frequency-domain diagram of the broadcast signal to be interfered with is as Figure 10 shown, and the frequency-domain diagram of the modulated audio signal, that is, the interference signal, is as Figure 11 shown. The frequency-domain diagram of the broadcast signal after interference is as Figure 12 shown. Thus, by appropriately increasing the power of the interference signal, the original audio signal can be effectively suppressed, enabling the receiving end to receive the interference audio and achieving the interference effect.

[0079] Optionally, the type of the interference source includes the noise interference type; generating the interference signal matching the frequency includes: obtaining a noise signal, and the type of the noise signal includes the narrowband Gaussian white noise type; performing double-sideband modulation with suppressed carrier on the noise signal according to the interference modulation parameters matching the frequency to generate the interference signal matching the frequency.

[0080] Similar to the previous example, when the interference source is narrowband Gaussian white noise, correspondingly, double-sideband modulation signals can be used to interfere with the amplitude modulation broadcast signal, and its time-domain expression is:

[0081]

[0082] Among them, w c is the carrier angular frequency of the interference signal, m1(t) is the baseband interference modulation signal, is the initial phase of the interference radio frequency signal.

[0083] Exemplarily, the spectrogram of the noise signal is as Figure 13 shown.

[0084] In a specific example, the time-domain diagram of the broadcast signal to be interfered with is as Figure 7 shown, and the time-domain diagram of the modulated noise signal, that is, the interference signal, is asFigure 14 As shown. The time-domain diagram of the jammed broadcast signal is as Figure 15 shown. The frequency-domain diagram of the broadcast signal to be jammed is as Figure 7 shown. The frequency-domain diagram of the modulated noise signal, i.e., the jammer signal, is as Figure 16 shown. The frequency-domain diagram of the jammed broadcast signal is as Figure 17 shown. Thus, it can be seen that in both the time domain and the frequency domain, the jammed broadcast signal has completely covered the broadcast signal before jamming. Therefore, by appropriately increasing the power of the jammer signal, the double-sideband modulation signal of narrowband Gaussian white noise can effectively cover the amplitude-modulated broadcast signal and achieve the jamming effect.

[0085] Specifically, the type of jammer source can be selected for each channel, specifically, the audio jamming type or the noise jamming type can be selected. If the audio jamming type is selected, then further the source of the audio signal needs to be selected, such as pre-stored audio or external audio stream, etc., and the audio signal is modulated into a high-frequency signal to form a jammer signal. If the noise jamming type is selected, then narrowband Gaussian white noise is generated and double-sideband modulation is performed to form a jammer signal. Among them, the narrowband Gaussian white noise can refer to a type of noise whose probability density function satisfies the statistical characteristics of the normal distribution, the power spectral density function is a constant, and the bandwidth is much smaller than its center frequency.

[0086] S130, superimpose each of the jammer signals to obtain a radio frequency signal.

[0087] Specifically, the multi-jammer signal generation device in the multi-frequency jamming system superimposes the generated jammer signals to obtain a radio frequency signal.

[0088] Specifically, the jammer signals are superimposed by the FPGA in the multi-jammer signal generation device, and the synthesized signal after superimposition is subjected to digital-to-analog conversion by the DAC to generate a radio frequency signal.

[0089] S140, externally transmit the radio frequency signal, and the radio frequency signal is used to jam each of the original signals with matching frequencies.

[0090] Specifically, the antenna device in the multi-frequency jamming system externally transmits the radio frequency signal.

[0091] In addition, after obtaining the radio frequency signal, signal processing can also be performed by the signal processing device in the multi-frequency jamming system. The radio frequency signal processed by the signal processing device is sent to the antenna and then externally transmitted by the antenna.

[0092] Optionally, the externally transmitting the radio frequency signal includes: amplifying and filtering the radio frequency signal; externally transmitting the processed radio frequency signal.

[0093] In fact, the radio frequency signal is amplified and filtered and then radiated through the antenna to interfere with all the channels that need to be interfered simultaneously.

[0094] In the embodiment of the present invention, the interference signals of multiple different channels are superimposed and transmitted through one antenna, so as to realize multi-frequency simultaneous interference by a single set of equipment, reduce the cost of multi-frequency interference, and at the same time, the settings can be made respectively for each channel, with high flexibility. Moreover, the original audio signal can be effectively suppressed, so that the receiving end receives the interfering audio to achieve the interference effect.

[0095] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A multi-frequency interference system, characterized in that, Comprising: A multi-interference signal generating device, a signal processing device, and an antenna; The multi-interference signal generating device is connected to the signal processing device, and is used for simultaneously generating interference signals of multiple frequencies, superimposing them, and generating a radio frequency signal to be sent to the signal processing device; wherein, the multi-interference signal generating device is configured with at least two types of interference sources; The signal processing device is connected to the antenna, and is used for performing signal processing on the radio frequency signal and sending it to the antenna; The antenna is used for externally sending the processed radio frequency signal; The signal processing device includes: a power amplifier device and a filter device; The power amplifier device is respectively connected to the multi-interference signal generating device and the filter device, and is used for amplifying the radio frequency signal; The filter device is connected to the antenna, and is used for filtering the amplified radio frequency signal to obtain the processed radio frequency signal and sending it to the antenna; The multi-frequency interference system further includes: a monitoring device; The monitoring device is respectively connected to the multi-interference signal generating device and the signal processing device, and is used for monitoring the multi-interference signal generating device and the signal processing device; Wherein, the monitoring device is further used for alarming when abnormalities occur in the multi-interference signal generating device and the signal processing device; The multi-interference signal generating device includes: a field programmable gate array and a digital-to-analog converter; The field programmable gate array is connected to the digital-to-analog converter; The field programmable gate array is used for generating at least two interference signals and superimposing them to obtain a composite signal, the frequencies of different interference signals are different, and the number of types of the interference signals includes at least two; The digital-to-analog converter is used for performing digital-to-analog conversion on the composite signal in digital form to obtain a radio frequency signal in analog form.

2. The multi-frequency interference system according to claim 1, characterized in that, Further comprising: A power supply device; The power supply device is connected to the power amplifier device, and is used for providing a stable DC power supply for the power amplifier device; The monitoring device is connected to the power supply device, and is used for monitoring the power supply device.

3. A multi-frequency interference method, characterized in that, Applied to the multi-frequency interference system as described in any one of claims 1-2, including: Obtaining at least two frequencies and the interference information corresponding to each of the frequencies; Respectively generating interference signals matching each of the frequencies; Superimposing each of the interference signals to obtain a radio frequency signal; wherein, the multi-interference signal generating device in the multi-frequency interference system superimposes the generated interference signals to obtain a radio frequency signal; the interference signals are superimposed by the FPGA in the multi-interference signal generating device, and the DAC performs digital-to-analog conversion on the superimposed composite signal to generate a radio frequency signal; Externally sending the radio frequency signal, and the radio frequency signal is used for interfering with the original signals matching each of the frequencies; The externally sending the radio frequency signal includes: amplifying and filtering the radio frequency signal; externally sending the processed radio frequency signal.

4. The method according to claim 3, characterized in that, The interference information includes: interference modulation parameters and interference source types, and the interference source types include audio interference types or noise interference types.

5. The method according to claim 4, characterized in that, The interference source type includes an audio interference type; The generating the interference signal matching the frequency includes: Generating an audio signal; Amplify the audio signal according to the interference modulation parameter matched with the frequency to generate an interference signal matched with the frequency.

6. The method according to claim 4, characterized in that, The interference source type includes a noise interference type; The generating of the interference signal matched with the frequency includes: Obtain a noise signal, and the type of the noise signal includes a narrowband Gaussian white noise type; Perform double-sideband suppressed-carrier modulation on the noise signal according to the interference modulation parameter matched with the frequency to generate an interference signal matched with the frequency.

7. The method according to claim 3, wherein The externally transmitting of the radio frequency signal includes: Amplify and filter the radio frequency signal; Externally transmit the processed radio frequency signal.

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