CN115664460A - Frequency hopping communication system and method based on electromagnetic interference - Google Patents
Frequency hopping communication system and method based on electromagnetic interference Download PDFInfo
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- CN115664460A CN115664460A CN202211341636.3A CN202211341636A CN115664460A CN 115664460 A CN115664460 A CN 115664460A CN 202211341636 A CN202211341636 A CN 202211341636A CN 115664460 A CN115664460 A CN 115664460A
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Abstract
The invention discloses a frequency hopping communication system based on electromagnetic interference, and the real-time self-organizing communication method comprises a frequency hopping communication mode based on external electromagnetic interference perception and a frequency hopping communication mode based on active electromagnetic interference. The frequency hopping communication mode based on external electromagnetic interference perception monitors a space frequency spectrum in real time under a complex electromagnetic environment and in the presence of interference signals, and actively switches a communication frequency band and a bandwidth according to the frequency spectrum environment. The frequency hopping communication mode based on the active electromagnetic interference switches communication frequency bands and bandwidth in real time according to communication control sequence codes, and transmits interference signals with frequency spectrum gaps to shield other frequency bands. According to the invention, the anti-interference performance, the frequency spectrum utilization rate and the communication rate of the radio frequency transceiving system can be improved based on the frequency hopping communication of external electromagnetic interference sensing; the frequency hopping communication based on the active electromagnetic interference can improve the anti-interference capability and the communication confidentiality of the radio frequency transceiving system.
Description
Technical Field
The invention belongs to the fields of wireless communication, electronic science and technology, and relates to a frequency hopping communication system and method based on electromagnetic interference.
Background
In recent years, technologies such as wireless mobile communication, millimeter wave radar, electronic countermeasure and the like have been developed rapidly, and more spectrum resources are put into use. Coexistence of multiple wireless communication systems causes the spectrum to become congested, which can severely impact the communication efficiency and communication quality of the transceiver. Meanwhile, with the development and progress of semiconductor technology, the mobile terminal is continuously developed towards universalization and multifunctional integration, and is compatible with various functions such as communication, radar, electronic countermeasure and the like. In order to ensure that the transceiver can be used in a plurality of frequency bands in a wide-area frequency spectrum range and can normally work in a complex electromagnetic environment, the self-organizing optimization technology becomes a key technology for designing the radio frequency transceiver.
The self-organizing optimization technology is to enable a transceiver system to work in an expected optimal state by monitoring a space electromagnetic environment and automatically adjusting the system structure and parameters of the transceiver in real time according to the frequency spectrum environment change. According to a traditional self-organizing optimization mechanism, interference signal frequency is monitored and tracked through an interference signal monitoring circuit, network parameters of an adjustable anti-interference circuit are adjusted according to monitoring results, interference signals are eliminated in a receiving link, and self-organizing optimization is achieved. The self-organizing optimization mechanism generally aims at narrow-band interference signals, and cannot meet the requirements of simultaneous use of multiple frequency bands in a wide frequency range and self-organizing optimization of transceivers in a complex electromagnetic environment.
The invention discloses a self-adaptive anti-interference circuit (CN 111988033A, 2020.11.24), which comprises an adjustable anti-interference circuit and an interference signal monitoring circuit, wherein the interference signal is monitored and tracked by using the frequency locking characteristic of a phase-locked loop, and the adjustable anti-interference circuit network is controlled to realize self-adaptive anti-interference. Due to the limitation of the network bandwidth of the adjustable anti-interference circuit, the self-adaptive anti-interference circuit can only eliminate narrow-band interference signals of a fixed frequency band at the same time, and the self-organizing optimization of the transceiver in a wide frequency spectrum range cannot be met.
In addition, in the conventional frequency hopping technology, the frequency hopping range is limited by a communication protocol, the communication frequency band is randomly hopped under the control of pseudo-random codes, interference cannot be actively avoided, and the communication secrecy and the anti-interference performance of the conventional frequency hopping technology are limited.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a frequency hopping communication system and method based on electromagnetic interference, which are used for solving the problem that the anti-interference capability, the communication speed and the communication confidentiality are difficult to improve in a wide frequency range and a complex electromagnetic environment in the traditional technology; the system monitors the space frequency spectrum in real time based on the frequency hopping communication mode of external electromagnetic interference perception, actively switches the communication frequency band and the bandwidth according to the frequency spectrum environment, realizes the active frequency hopping communication based on the electromagnetic environment perception, and solves the defect that the existing self-adaptive anti-interference technology can only track and eliminate narrow-band interference signals; the system is based on a frequency hopping communication mode of active electromagnetic interference, communication frequency bands and bandwidth are switched in real time according to communication control sequence codes, interference signals with frequency spectrum gaps are transmitted to shield other frequency bands, and the anti-interference capability and the communication confidentiality of a radio frequency transceiving system are improved.
The technical scheme is as follows: in order to solve the above problems, the present invention provides a frequency hopping communication method based on external electromagnetic interference, which includes the following steps:
step 1: receiving a radio frequency signal in an electromagnetic environment;
and 2, step: analyzing to obtain frequency spectrum information of the radio frequency signal;
and step 3: receiving and storing frequency spectrum information of the received signal by using a memory;
and 4, step 4: and judging whether the frequency spectrum of the communication frequency band of the current transmission signal is crowded or strong electromagnetic interference exists, and if so, switching the communication frequency band to an idle frequency band.
Preferably, the frequency spectrum information is obtained by performing fast fourier transform, FFT, on the received radio frequency signal.
Preferably, the method for determining whether the communication frequency band spectrum of the current transmission signal is crowded or has strong electromagnetic interference is as follows: and if the power spectral density of the interference signal of the current communication frequency band is larger than the interference suppression threshold value of the receiver, judging that the frequency spectrum of the current communication frequency band is crowded or strong electromagnetic interference exists.
The invention also provides a frequency hopping communication method based on active electromagnetic interference, which comprises the following steps:
step 1: a sequence code generator of the wireless terminal A generates an interference control sequence code and a communication control sequence code;
and 2, step: the wireless terminal A and the wireless terminal B establish handshake communication, and the wireless terminal A sends an interference control sequence code and a communication control sequence code generated by the wireless terminal A to the wireless terminal B;
and step 3: selecting a preset frequency band as a communication frequency band of a wireless terminal A and a wireless terminal B, wherein a transmitter in the wireless terminal A transmits an interference signal of a preset frequency spectrum and preset power; shielding other frequency bands except the communication frequency band by using interference signals to serve as shielding frequency bands; the central frequency and the bandwidth of the frequency spectrum gap in the interference signal jump in real time according to the time sequence of the interference control sequence code;
and 4, step 4: a transmitter in the wireless terminal A transmits a preset signal in the frequency spectrum gap of the interference signal, and a receiver in the wireless terminal B receives the preset signal transmitted by the wireless terminal A in the frequency spectrum gap of the interference signal; and the central frequency and the bandwidth of the communication frequency bands of the wireless terminal A and the wireless terminal B jump in real time according to the time sequence of the communication control sequence code.
Preferably, the process of the wireless terminal a transmitting the generated interference control sequence code and communication control sequence code to the wireless terminal B in step 2 includes the following steps:
step 2-1: the wireless terminal B generates a pair of keys, wherein the keys comprise a public key and a private key, and the wireless terminal B sends the generated public key to the wireless terminal A;
step 2-2: the wireless terminal A encrypts an interference control sequence code and a communication control sequence code generated by the wireless terminal A by using a public key sent by the wireless terminal B;
step 2-3: the wireless terminal A sends the encrypted interference control sequence code and the encrypted communication control sequence code to a wireless terminal B;
step 2-4: and the wireless terminal B receives the interference control sequence code and the communication control sequence code which are sent by the wireless terminal A and encrypted by the public key, and decrypts the data by using the private key to obtain the interference control sequence code and the communication control sequence code of the wireless terminal A.
The invention also provides a frequency hopping communication system based on electromagnetic interference, which comprises a receiving and transmitting unit, a monitoring unit, a regulating and controlling unit and a baseband processing unit;
the monitoring unit comprises an observation receiver and a spectrum analysis module, is connected with the regulation and control unit and is used for monitoring the electromagnetic environment in real time, analyzing the spectrum use and the electromagnetic interference condition and feeding back to the regulation and control unit;
the regulation and control unit is respectively connected with the receiving and sending unit and the baseband processing unit and is used for regulating the bandwidth of the baseband processing unit and the working frequency band and bandwidth of the receiving and sending unit;
the receiving and transmitting unit comprises a multifunctional radio frequency receiver, a multifunctional radio frequency transmitter and a local oscillation signal generating circuit and is used for receiving and transmitting radio signals;
the regulating and controlling unit comprises a regulating module and a control module.
Preferably, the control module comprises a memory, an arithmetic unit, a sequence code generator, a logic controller and a bus;
the memory is used for storing the frequency spectrum information in the space and the self-organizing optimization algorithm;
the arithmetic unit is used for analyzing the frequency spectrum information and operating a corresponding self-organizing optimization algorithm to generate an adjusting instruction;
a sequence code generator for generating an interference control sequence code and a communication control sequence code;
the logic controller is used for decoding the interference control sequence code, the communication control sequence code and the regulating instruction generated by the arithmetic unit;
the bus is used for connecting the memory, the arithmetic unit, the sequence code generator and the logic controller to realize information transmission and interaction among the memory, the arithmetic unit, the sequence code generator and the logic controller;
the adjusting module comprises a switch or a switch array network, and one or more combinations of a tuning network, a resistance network, a transmission line network and a transformer network, and is used for adjusting the central frequency and the bandwidth of a communication frequency band and the central frequency and the bandwidth of an interference signal spectrum gap.
Preferably, the multifunctional radio frequency receiver comprises a low noise amplifier, a down-conversion mixer, a receiver programmable gain amplifier, a receiver filter and an analog-to-digital converter; the input end of the low-noise amplifier receives a radio-frequency input signal, the output end of the low-noise amplifier is connected with the radio-frequency input end of a down-conversion frequency mixer, the output end of a local oscillation signal generating circuit is connected with the local oscillation input end of the down-conversion frequency mixer, the output end of the down-conversion frequency mixer is connected with the input end of a programmable gain amplifier, the output end of the programmable gain amplifier is connected with the input end of a receiver filter, the output end of the receiver filter is connected with the input end of an analog-to-digital converter, and the analog-to-digital converter outputs a digital signal;
the multifunctional radio frequency transmitter comprises a digital-to-analog converter, a transmitter filter, a transmitter programmable gain amplifier, an up-conversion mixer and a power amplifier; the input end of the digital-to-analog converter is connected with the output end of the baseband processing unit, the output end of the digital-to-analog converter is connected with the input end of the transmitter filter, the output end of the transmitter filter is connected with the input end of the transmitter programmable gain amplifier, the output end of the transmitter programmable gain amplifier is connected with the intermediate frequency input end of the up-conversion mixer, the output end of the local oscillation signal generating circuit is connected with the local oscillation input end of the up-conversion mixer, the output end of the up-conversion mixer is connected with the input end of the power amplifier, and the power amplifier outputs radio-frequency signals.
Preferably, the transceiver unit has one or more combined functions of communication, radar, tracking, navigation and electronic countermeasure, and the working frequency band includes one or more frequency bands of radio frequency, microwave, millimeter wave and submillimeter wave.
Has the advantages that: compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
(1) Compared with the prior art, the real-time self-organized communication method and the radio frequency transceiving system can be used at the same time in different frequency bands in a wide frequency range and under a complex electromagnetic environment, monitor and judge the frequency spectrum environment in real time based on the frequency hopping communication mode of external electromagnetic interference perception, realize active frequency hopping communication, and solve the problems that the traditional self-adaptive anti-interference scheme can only track and eliminate narrow-band interference signals and cannot adapt to the complex frequency spectrum environment; the frequency hopping communication mode based on active electromagnetic interference switches communication frequency bands and bandwidths in real time according to communication control sequence codes, and transmits interference signals with frequency spectrum gaps to shield other frequency bands, so that the anti-interference capability and the communication security of a radio frequency transceiving system are improved. The real-time self-organizing optimized radio frequency transceiving system and method can be widely applied to scenes of dynamic changes of interference signals such as mobile communication, radar, electronic countermeasure and the like, and can realize self-organizing optimization of the transceiver in multifunctional integrated application scenes such as communication, radar, electronic countermeasure and the like.
(2) The invention provides a frequency hopping communication method based on external electromagnetic interference, which is characterized in that an electromagnetic environment monitoring unit is used for monitoring a frequency spectrum environment in real time, and based on judgment of the use condition of the frequency spectrum, a real-time changing idle frequency band under a wide frequency spectrum coverage environment is utilized for communication, so that active frequency hopping based on electromagnetic environment perception is realized, the frequency hopping range breaks through the limitation of a traditional protocol, and full-frequency-band frequency hopping is realized. Compared with the existing self-adaptive anti-interference technology and frequency hopping technology, the frequency hopping communication method based on electromagnetic environment sensing can have stronger anti-interference performance, higher frequency spectrum utilization rate and higher communication rate in a wide frequency spectrum coverage environment.
(3) The frequency hopping communication method based on the active electromagnetic interference generates the wide-spectrum interference signal, carries out communication by utilizing the randomly changed spectrum gaps in the wide-spectrum interference signal, and switches the communication frequency band among different spectrum gaps in real time, realizes secret communication while actively interfering the communication frequency band of the other party, and further improves the electronic countermeasure and secret communication performance of the transceiving system.
Drawings
Fig. 1 is a functional schematic diagram of two frequency modulation communication methods according to the present invention.
Fig. 2 is a flowchart of a frequency hopping communication method based on external electromagnetic interference according to the present invention.
Fig. 3 is a flowchart of a frequency hopping communication method based on active electromagnetic interference according to the present invention.
Fig. 4 is a frequency hopping communication system based on electromagnetic interference according to the present invention.
Fig. 5 is a block diagram of a control unit of a frequency hopping communication system based on electromagnetic interference according to the present invention.
Fig. 6 is a block diagram of an interference signal transmitter of a frequency hopping communication system based on electromagnetic interference according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in fig. 1, it is a functional schematic diagram of two frequency modulation communication methods proposed by the present invention, combining electromagnetic interference, and performing real-time self-organizing frequency hopping communication; the real-time self-organizing communication method comprises a frequency hopping communication mode based on external electromagnetic interference perception and a frequency hopping communication mode based on active electromagnetic interference. The frequency hopping communication mode based on external electromagnetic interference perception monitors a space frequency spectrum in real time under a complex electromagnetic environment and in the presence of interference signals, and actively switches a communication frequency band and a bandwidth according to the frequency spectrum environment.
The frequency hopping communication mode based on the active electromagnetic interference switches communication frequency bands and bandwidths in real time according to communication control sequence codes, and transmits interference signals with frequency spectrum gaps to shield other frequency bands, and the center frequencies and the bandwidths of the frequency spectrum gaps are switched in real time according to the interference control sequence codes.
As shown in fig. 2, it is a flowchart of a frequency hopping communication method based on external electromagnetic interference according to the present invention, and the method includes the following steps:
step 1: receiving a radio frequency signal in an electromagnetic environment;
step 2: analyzing to obtain frequency spectrum information of the radio frequency signal;
and step 3: receiving and storing frequency spectrum information of the received signal by using a memory;
and 4, step 4: and judging whether the frequency spectrum of the communication frequency band of the current transmission signal is crowded or strong electromagnetic interference exists, and if so, switching the communication frequency band to an idle frequency band.
The frequency spectrum information is obtained by performing Fast Fourier Transform (FFT) on the received radio frequency signal.
The method for judging whether the spectrum of the current frequency band is crowded or strong electromagnetic interference exists comprises the following steps: and if the power spectral density of the interference signal of the current communication frequency band is greater than the interference suppression threshold value of the receiver, judging that the current communication frequency band is crowded or has strong electromagnetic interference, and otherwise, judging that the current communication frequency band is an idle frequency band.
For example, when the radio frequency transceiving system currently operates in an X frequency band, the system receives a radio frequency signal in an electromagnetic environment before a transmitter transmits a useful signal, extracts frequency spectrum information of the radio frequency signal, analyzes and judges whether the X frequency band is occupied, and switches a communication frequency band to a Y frequency band if the X frequency band is occupied.
By monitoring the frequency spectrum environment in real time and switching the communication frequency band, active frequency hopping based on electromagnetic environment sensing is realized, and the frequency spectrum resource utilization rate, the anti-interference performance of a receiving and transmitting system and the communication rate are improved.
Fig. 3 is a flowchart of a frequency hopping communication method based on active electromagnetic interference according to the present invention, which includes the following steps:
step 1: a sequence code generator of the wireless terminal A generates an interference control sequence code and a communication control sequence code;
step 2: the wireless terminal A and the wireless terminal B establish handshake communication, and the wireless terminal A sends an interference control sequence code and a communication control sequence code generated by the wireless terminal A to the wireless terminal B;
and step 3: selecting a preset frequency band as a communication frequency band of a wireless terminal A and a wireless terminal B, wherein a transmitter in the wireless terminal A transmits an interference signal of a preset frequency spectrum and preset power; shielding other frequency bands except the communication frequency band by using interference signals to serve as shielding frequency bands; the central frequency and the bandwidth of the frequency spectrum gap in the interference signal jump in real time according to the time sequence of the interference control sequence code;
and 4, step 4: a transmitter in the wireless terminal A transmits a preset signal in a frequency spectrum gap of the interference signal, and a receiver in the wireless terminal B receives the preset signal transmitted by the wireless terminal A in the frequency spectrum gap of the interference signal; and the central frequency and the bandwidth of the communication frequency bands of the wireless terminal A and the wireless terminal B jump in real time according to the time sequence of the communication control sequence code.
The process that the wireless terminal a sends the generated interference control sequence code and communication control sequence code to the wireless terminal B in the step 2 comprises the following steps:
step 2-1: the wireless terminal B generates a pair of keys, wherein the keys comprise a public key and a private key, and the wireless terminal B sends the generated public key to the wireless terminal A;
step 2-2: the wireless terminal A encrypts an interference control sequence code and a communication control sequence code generated by the wireless terminal A by using a public key sent by the wireless terminal B;
step 2-3: the wireless terminal A sends the encrypted interference control sequence code and the encrypted communication control sequence code to a wireless terminal B;
step 2-4: and the wireless terminal B receives the interference control sequence code and the communication control sequence code which are sent by the wireless terminal A and encrypted by the public key, and decrypts the data by using the private key to obtain the interference control sequence code and the communication control sequence code of the wireless terminal A.
Fig. 4 is a block diagram of a frequency hopping communication system based on electromagnetic interference according to the present invention.
The system comprises a transceiver unit 101, a baseband processing unit 102, a regulation unit 103 and a monitoring unit 104; the receiving and transmitting unit 101 comprises a multifunctional radio frequency receiver 101-1, a multifunctional radio frequency transmitter 101-2 and a local oscillation signal generating circuit 101-3; the regulation and control unit 103 comprises a control module 103-1 and a regulation module 103-2; the monitoring unit 104 includes an observation receiver 104-1 and a spectrum analysis module 104-2.
The monitoring unit 104 is connected with the regulating unit 103, and is used for monitoring the electromagnetic environment in real time, analyzing the frequency spectrum usage and the interference situation, and feeding back to the regulating unit 103; the adjusting and controlling unit 103 is connected to the transceiving unit 101 and the baseband processing unit 102, and is configured to adjust a bandwidth of the baseband processing unit 102 and a working frequency band of the transceiving unit 101; the transceiver unit 101 is used for receiving and transmitting radio signals, and has one or more combinations of communication, radar, tracking, navigation and electronic countermeasure functions, and the working frequency band includes one or more frequency bands of radio frequency, microwave, millimeter wave and submillimeter wave.
Specifically, the multifunctional rf receiver 101-1 includes n rf receiving channels, where n is an integer greater than 1, and each rf receiving channel employs a multi-band reconfigurable circuit.
Specifically, the multifunctional rf transmitter 101-2 includes m rf transmitting channels, m is an integer greater than 1, and each rf transmitting channel employs a multi-band reconfigurable circuit.
Specifically, the local oscillator signal generating circuit 101-3 includes a wideband frequency synthesizer or a combination of multiple frequency synthesizers.
Fig. 5 is a block diagram of a control unit of a frequency hopping communication system based on electromagnetic interference according to the present invention.
The regulation and control unit 103 comprises a control module 103-2 and a regulation module 103-1;
the control module 103-2 comprises a memory 103-2-1, an arithmetic unit 103-2-2, a sequence code generator 103-2-3, a logic controller 103-2-4 and a bus 103-2-5;
the memory 103-2-1 is used for storing frequency spectrum information in a space and a self-organizing optimization algorithm;
the arithmetic unit 103-2-2 is used for analyzing the frequency spectrum information and operating a corresponding self-organizing optimization algorithm to generate a regulating instruction;
the sequence code generator 103-2-3 is configured to generate an interference control sequence code and a communication control sequence code;
the logic controller 103-2-4 is used for decoding the interference control sequence code, the communication control sequence code and the regulating instruction generated by the arithmetic unit;
the bus 103-2-5 is used for connecting the arithmetic unit, the memory, the sequence code generator and the logic controller, and realizing information transmission and interaction among the arithmetic unit, the memory, the sequence code generator and the logic controller.
The adjusting module 103-1 comprises a switch or a switch array network 103-1-1, and one or more combinations of a tuning network 103-1-2, a resistor network 103-1-3, a transmission line network 103-1-4 and a transformer network 103-1-5, and is used for adjusting the center frequency and bandwidth of a communication frequency band and the center frequency and bandwidth of an interference signal spectrum gap.
Fig. 6 is a block diagram of an interference signal transmitter of a frequency hopping communication system based on electromagnetic interference according to the present invention.
The multifunctional radio frequency receiver comprises a low noise amplifier 101-1-1, a down-conversion mixer 101-1-2, a receiver programmable gain amplifier 101-1-3, a receiver filter 101-1-4 and an analog-to-digital converter 101-1-5.
The input end of the low-noise amplifier 101-1-1 receives a radio frequency input signal, the output end of the low-noise amplifier is connected with the radio frequency input end of the down-conversion mixer 101-1-2, the output end of the local oscillator signal generating circuit 101-3 is connected with the local oscillator input end of the down-conversion mixer 101-1-2, the output end of the down-conversion mixer 101-1-2 is connected with the input end of the programmable gain amplifier 101-1-3, the output end of the programmable gain amplifier 101-1-3 is connected with the input end of the receiver filter 101-1-4, the output end of the receiver filter 101-1-4 is connected with the input end of the analog-to-digital converter 101-1-5, and the output end of the analog-to-digital converter 101-1-5 is connected with the input end of the baseband processing unit 102.
The multifunctional radio frequency transmitter comprises a digital-to-analog converter 101-2-5, a transmitter filter 101-2-4, a transmitter programmable gain amplifier 101-2-3, an up-conversion mixer 101-2-2 and a power amplifier 101-2-1.
The input end of the digital-to-analog converter 101-2-5 is connected with the output end of the baseband processing unit 102, the output end of the digital-to-analog converter is connected with the input end of the transmitter filter 101-2-4, the output end of the transmitter filter 101-2-4 is connected with the input end of the transmitter programmable gain amplifier 101-2-3, the output end of the transmitter programmable gain amplifier 101-2-3 is connected with the intermediate frequency input end of the up-conversion mixer 101-2-2, the output end of the local oscillation signal generating circuit 101-3 is connected with the local oscillation input end of the up-conversion mixer 101-2-2, the output end of the up-conversion mixer 101-2-2 is connected with the input end of the power amplifier 101-2-1, and the power amplifier 101-2-1 outputs radio frequency signals.
Claims (9)
1. A frequency hopping communication method based on external electromagnetic interference is characterized by comprising the following steps:
step 1: receiving a radio frequency signal in an electromagnetic environment;
step 2: analyzing to obtain frequency spectrum information of the radio frequency signal;
and step 3: receiving and storing frequency spectrum information of the received signal by using a memory;
and 4, step 4: and judging whether the frequency spectrum of the communication frequency band of the current transmission signal is crowded or strong electromagnetic interference exists, and if so, switching the communication frequency band to an idle frequency band.
2. The method of claim 1, wherein the spectrum information is obtained by performing a Fast Fourier Transform (FFT) on the received radio frequency signal.
3. The frequency hopping communication method based on external electromagnetic interference sensing as claimed in claim 1 or 2, wherein the method for determining whether the communication frequency band spectrum of the current transmission signal is crowded or strong electromagnetic interference exists is as follows: and if the power spectral density of the interference signal of the current communication frequency band is greater than the interference suppression threshold of the receiver, judging that the frequency spectrum of the current communication frequency band is crowded or strong electromagnetic interference exists.
4. A frequency hopping communication method based on active electromagnetic interference is characterized by comprising the following steps:
step 1: a sequence code generator of the wireless terminal A generates an interference control sequence code and a communication control sequence code;
step 2: the wireless terminal A and the wireless terminal B establish handshake communication, and the wireless terminal A sends an interference control sequence code and a communication control sequence code generated by the wireless terminal A to the wireless terminal B;
and step 3: selecting a preset frequency band as a communication frequency band of a wireless terminal A and a wireless terminal B, wherein a transmitter in the wireless terminal A transmits an interference signal of a preset frequency spectrum and preset power; shielding other frequency bands except the communication frequency band by using interference signals to serve as shielding frequency bands; the central frequency and the bandwidth of the frequency spectrum gap in the interference signal jump in real time according to the time sequence of the interference control sequence code;
and 4, step 4: a transmitter in the wireless terminal A transmits a preset signal in a frequency spectrum gap of the interference signal, and a receiver in the wireless terminal B receives the preset signal transmitted by the wireless terminal A in the frequency spectrum gap of the interference signal; and the central frequency and the bandwidth of the communication frequency bands of the wireless terminal A and the wireless terminal B jump in real time according to the time sequence of the communication control sequence code.
5. The active electromagnetic interference-based frequency hopping communication method according to claim 4, wherein said step 2, the wireless terminal A sends the generated interference control sequence code and communication control sequence code to the wireless terminal B, comprises the steps of:
step 2-1: the wireless terminal B generates a pair of keys, wherein the keys comprise a public key and a private key, and the wireless terminal B sends the generated public key to the wireless terminal A;
step 2-2: the wireless terminal A encrypts an interference control sequence code and a communication control sequence code generated by the wireless terminal A by using a public key sent by the wireless terminal B;
step 2-3: the wireless terminal A sends the encrypted interference control sequence code and the encrypted communication control sequence code to a wireless terminal B;
step 2-4: and the wireless terminal B receives the interference control sequence code and the communication control sequence code which are sent by the wireless terminal A and encrypted by the public key, and decrypts the data by using the private key to obtain the interference control sequence code and the communication control sequence code of the wireless terminal A.
6. A frequency hopping communication system based on electromagnetic interference, characterized by: the system comprises a transceiving unit, a monitoring unit, a regulating unit and a baseband processing unit;
the monitoring unit comprises an observation receiver and a spectrum analysis module, is connected with the regulation and control unit and is used for monitoring the electromagnetic environment in real time, analyzing the spectrum use and the electromagnetic interference condition and feeding back to the regulation and control unit;
the regulation and control unit is respectively connected with the transceiving unit and the baseband processing unit and is used for regulating the bandwidth of the baseband processing unit and the working frequency band and bandwidth of the transceiving unit;
the receiving and transmitting unit comprises a multifunctional radio frequency receiver, a multifunctional radio frequency transmitter and a local oscillation signal generating circuit and is used for receiving and transmitting radio signals;
the regulating and controlling unit comprises a regulating module and a control module.
7. The emi based frequency hopping communication system of claim 6, wherein: the control module comprises a memory, an arithmetic unit, a sequence code generator, a logic controller and a bus;
the memory is used for storing the frequency spectrum information in the space and the self-organizing optimization algorithm;
the arithmetic unit is used for analyzing the frequency spectrum information and operating a corresponding self-organizing optimization algorithm to generate an adjusting instruction;
a sequence code generator for generating an interference control sequence code and a communication control sequence code;
the logic controller is used for decoding the interference control sequence code, the communication control sequence code and the regulating instruction generated by the arithmetic unit;
the bus is used for connecting the memory, the arithmetic unit, the sequence code generator and the logic controller to realize information transmission and interaction among the memory, the arithmetic unit, the sequence code generator and the logic controller;
the adjusting module comprises a switch or a switch array network, and one or more combinations of a tuning network, a resistor network, a transmission line network and a transformer network, and is used for adjusting the central frequency and the bandwidth of a communication frequency band and the central frequency and the bandwidth of an interference signal spectrum gap.
8. The emi based frequency hopping communication system of claim 6, wherein: the multifunctional radio frequency receiver comprises a low noise amplifier, a down-conversion mixer, a receiver programmable gain amplifier, a receiver filter and an analog-to-digital converter; the input end of the low-noise amplifier receives a radio frequency input signal, the output end of the low-noise amplifier is connected with the radio frequency input end of the down-conversion frequency mixer, the output end of the local oscillator signal generating circuit is connected with the local oscillator input end of the down-conversion frequency mixer, the output end of the down-conversion frequency mixer is connected with the input end of the programmable gain amplifier, the output end of the programmable gain amplifier is connected with the input end of a receiver filter, the output end of the receiver filter is connected with the input end of an analog-to-digital converter, and the analog-to-digital converter outputs a digital signal;
the multifunctional radio frequency transmitter comprises a digital-to-analog converter, a transmitter filter, a transmitter programmable gain amplifier, an up-conversion mixer and a power amplifier; the input end of the digital-to-analog converter is connected with the output end of the baseband processing unit, the output end of the digital-to-analog converter is connected with the input end of the transmitter filter, the output end of the transmitter filter is connected with the input end of the transmitter programmable gain amplifier, the output end of the transmitter programmable gain amplifier is connected with the intermediate frequency input end of the up-conversion mixer, the output end of the local oscillation signal generating circuit is connected with the local oscillation input end of the up-conversion mixer, the output end of the up-conversion mixer is connected with the input end of the power amplifier, and the power amplifier outputs radio-frequency signals.
9. The system according to claim 6 or 7, wherein the transceiver unit has one or more combination of communication, radar, tracking, navigation, and electronic countermeasure, and the operating frequency band includes one or more of radio frequency, microwave, millimeter wave, and sub-millimeter wave.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211341636.3A CN115664460A (en) | 2022-10-28 | 2022-10-28 | Frequency hopping communication system and method based on electromagnetic interference |
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