CN109728872A - A kind of unmanned plane interference system and method based on digital frequency memory technique - Google Patents
A kind of unmanned plane interference system and method based on digital frequency memory technique Download PDFInfo
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Abstract
本发明属于无线电电子对抗领域，具体涉及一种基于数字储频技术的无人机干扰系统及方法。系统包括依次连接的接收单元、存储单元、干扰信号产生单元和发射单元，还包括连接存储单元的主控单元。本系统先将不同频段的无人机信号进行下变频，通过ADC模块进行模数转换，再将数字信号通过FPGA存储在存储芯片中，接收一段时间后，将数字信号读出到DA模块中，经过数模转换，再经过上变频，还原出无人机信号，这样不管哪种类型的无人机，通信信号采用哪种编码方式，工作频点是多少，只要在工作波段内都可以进行用无人机本身的通信信号对其进行干扰。
The invention belongs to the field of radio electronic countermeasures, and in particular relates to an unmanned aerial vehicle jamming system and method based on digital frequency storage technology. The system includes a receiving unit, a storage unit, an interference signal generating unit and a transmitting unit connected in sequence, and also includes a main control unit connected to the storage unit. The system first down-converts the UAV signals in different frequency bands, performs analog-to-digital conversion through the ADC module, and then stores the digital signal in the memory chip through the FPGA. After receiving for a period of time, the digital signal is read into the DA module. After digital-to-analog conversion, and then up-conversion, the UAV signal is restored, so that no matter what type of UAV, which encoding method is used for the communication signal, and what is the working frequency, it can be used as long as it is within the working band. The communication signal of the drone itself interferes with it.
Description
Technical field
The invention belongs to radio electronics to fight field, and in particular to a kind of unmanned plane interference based on digital frequency memory technique
System and method.
Background technique
The characteristics of unmanned plane are as follows: flying height is lower, and small volume, flying speed is slower, usage scenario than wide, because
This is relatively difficult to the detection of unmanned plane.In recent years, country constantly reinforces the supervision of the civil aircraft this kind of to unmanned plane,
Corresponding " General Aviation Flight regulations " are put into effect.Therefore, the flight of unmanned plane must satisfy the flight safety of aircraft
It is required that unmanned plane operator's qualification requirement etc..
Development of UAV and universal dynamics are more and swifter and more violent both at home and abroad at present, occur much having possessed unmanned plane
Fan.But the airworthiness requirement of department, civil aviaton is also not achieved in many unmanned planes in China, in " black to fly " state, Misuse
Unmanned plane grave danger caused by public safety.Nearly 2 years, China had occurred and that a lot of unmanned planes forced the class of suspending
Event causes huge economic loss.
It is generally directed to the method for disposal that the above problem is generally taken:
1. physics interception mode:
Common interception mode has: unmanned plane is shot down or is force-landed by opportunity of combat, and ground man with a gun shoots down unmanned plane, using sharp
Light weapon shoots down unmanned plane and intercepts unmanned plane using the mode of intercept net；
2. Electromagnetic Interference mode:
Main interference method has: noise jamming or cheating interference, there are many modes again for noise jamming, such as
High-power full frequency band cover jamming, tracking interference, the modes such as pectination interference；Cheating interference is mainly simulated and is generated and unmanned plane control
System and the same or similar signal of communication of navigation signal.
The mode of high-power full frequency band cover jamming is by generating control of the power much larger than unmanned plane and navigation signal
The advantages of noise signal of place frequency range interferes unmanned plane, the conflicting mode is that noise signal generates simply, is easy to real
It is existing；The disadvantage is that jamming power is excessive, other normal wireless telecommunications are influenced.To solve this problem, Patent No.:
CN108199802A, patent name are as follows: provided in " a kind of unmanned plane interference system and interference method based on electromagnetic interference "
Method can concentrate jamming power near relatively narrow frequency point, can reach cutting unmanned plane using slightly larger than remote signal power
Control the effect of link.But the method that this kind of mode is still suppressed using noise will reach interference effect, reach unmanned plane and connect
The power for receiving the interference signal of antenna front ends is 3~6dB bigger than UAV Communication signal, and the volume and power consumption of system are larger.
Relative to noise jamming system, it has been suggested that a kind of unmanned plane duplicity interference system, the system pass through
Interference signal generator generates the interference signal to match with unmanned plane, using digital-to-analogue conversion, up-conversion, and power amplification, most
Pass through aerial radiation to unmanned plane eventually.But existing unmanned plane type is more and more, and different manufacturers are in UAV Communication, communication letter
Number different coding modes is used, therefore when autonomous simulation generates the signal of communication of unmanned plane, does not only need to know that unmanned plane is logical
Believe coding mode, also needs to know its working frequency points, the difficulty for interfering unmanned plane is larger.
Summary of the invention
It is larger for interference system volume existing in the prior art and power consumption and be difficult to obtain the logical of different unmanned planes
The problem of believing coding mode, the invention proposes a kind of unmanned plane interference systems based on digital frequency memory technique, using following skill
Art scheme is realized:
A kind of unmanned plane interference system based on digital frequency memory technique, including receiving unit, storage unit, interference signal produce
Raw unit, main control unit and transmitting unit, which is characterized in that
The receiving unit is used to receive the signal of communication and navigation signal of unmanned plane, whether judges UAV Communication signal
In the presence of, and the signal of communication and navigation signal that receive unmanned plane are pre-processed, the pretreatment includes power amplification, lower change
Frequency and filtering processing；
The storage unit is for being converted to pretreated signal of communication and navigation signal that receiving unit receives
It is stored after digital signal, and generates unit transmission number letter to interference signal after the interference order for receiving main control unit
Number；
The main control unit, which is used to generate unit to storage unit and interference signal, issues interference order；
The interference signal generates unit and is used for after receiving the interference order of main control unit, receives storage unit transmission
Digital signal, and convert digital signals into analog signal and carry out up-conversion and obtain interference signal；
The transmitting unit be used for by interference signal generate unit generate interference signal according to corresponding service band into
Row filtering and power amplification, and interference signal after filtering and power amplification is done using directional antenna radiation to unmanned plane
It disturbs.
Further, the receiving unit includes sequentially connected receiving antenna, low noise amplifier, down conversion module, function
Divide device and bandpass filter, further include the DLVA being connected between power splitter and storage unit, the bandpass filter connection is deposited
Storage unit；
The storage unit includes sequentially connected ADC module, FPGA and storage chip, and the ADC module connects FPGA,
The FPGA connection storage chip, main control unit and interference signal generate unit；
It includes DAC module, up-converter module, local oscillator module and Clock management module, institute that the interference signal, which generates unit,
DAC module connection up-converter module is stated, the local oscillator module connects down conversion module, up-converter module and Clock management module,
The Clock management module connection ADC module and DAC module, the up-converter module connect transmitting unit；
The transmitting unit includes sequentially connected switch, filter module, power amplifier module and directional aerial mould
Block, the filter module include L-band filter, S-band filter and C-band filter, the power amplifier module
Including L-band power amplifier, S-band power amplifier and C-band power amplifier, the directional aerial module includes L wave
Section directional aerial, S-band directional aerial and C-band directional aerial.
Further, in the memory unit, the ADC module is used to carry out the signal after down coversion using sampling clock
Analog-to-digital conversion, then the digital signal after conversion is sent to FPGA；The FPGA for realizing local oscillator selection control, read and
The function of being communicated with main control unit；The storage chip is for storing the digital signal after analog-to-digital conversion；
It is generated in unit in interference signal, the DAC module is used to deposit using the recovered clock as sampling clock
The digital signal read in storage chip is converted to analog signal；The local oscillator module is used to be down conversion module and up-converter module
Local vibration source needed for frequency conversion is provided, while sampling clock is provided for ADC module and DAC module；The Clock management module is used for
After the sampling clock that local oscillator is provided is divided, sent respectively to ADC module and DAC module as sampling clock and when restoring
Clock；The up-converter module is for restoring baseband signal to interference signal needed for unmanned plane.
Further, the receiving antenna is omnidirectional antenna of the frequency in 1~6GHz.
Further, the storage chip uses DDR chip.
A kind of unmanned plane interference method based on digital frequency memory technique, includes the following steps:
Step 1: obtain the signal of communication and navigation signal of unmanned plane using receiving antenna, signal of communication to unmanned plane and
Navigation signal carries out power amplification and obtains S1；
Step 2: down coversion being carried out to S1, S2 is obtained using filtering, S2 is divided into the identical letter of two-way using power splitter
Number, it is transmitted to DLVA all the way, for judging that UAV Communication signal whether there is, another way is transmitted to A/D module and carries out real-time mould
Number is converted to digital signal S3；
Step 3: if DLVA detects that UAV Communication signal exists in step 2, FPGA reads S3 and deposits S3
Chip is stored up, while FPGA transmission alarm signal, to main control unit, main control unit, which issues, starts interference order, and FPGA reads storage core
S3 in piece line number mould of going forward side by side is converted to analog signal S4, enters step 4；If it is logical that unmanned plane is not detected in DLVA in step 2
When believing signal, S3 is not stored in storage chip, and main control unit does not issue interference order；
Step 4: up-conversion being carried out to S4, restores interference signal S5, the service band according to belonging to S5 turns on the switch simultaneously
Selection respective filter is filtered S5, then send into the power amplifier of relevant work wave band filtered S5 and carries out
Power amplification, will be by filtering and the interference signal spoke after power amplification finally by the directional aerial module of relevant work wave band
It is incident upon at unmanned plane and is interfered.
Further, working frequency range described in step 4 includes L-band, S-band and C-band.
The present invention there are also following the utility model has the advantages that
(1) present invention uses the conflicting mode based on digital frequency memory technique, can generate complete with UAV Communication signal
The interference signal of consistent interference signal, in this way arrival unmanned plane receiving antenna front end is equal with the power of UAV Communication signal
Unmanned plane normal communication can be interfered, greatly reduce the volume and power consumption of system.
(2) present invention can restore different types of unmanned plane signal, regardless of the unmanned plane of type, communication letter
Number use which kind of coding mode, working frequency points are how many, as long as we can be carried out with unmanned plane itself in working frequency range
Signal of communication it is interfered.
Detailed description of the invention
Fig. 1 is system structure diagram of the invention；
Specific embodiment
FPGA: field programmable gate array is a kind of very high chip of calculation process data speed, is usually used in digital signal
Processing.
DLVA: detection Log Video Amplifier, for judging that external communication signals whether there is.
Main control unit includes following function: software, the function of initializing of hardware, System self-test and malfunction coefficient function are
The display function and interface communication function of system running parameter and operating mode setting function, system operation control and state.
Low noise amplifier: referring to the very low amplifier of noise coefficient, be typically used as all kinds of radio receivers high frequency or in
Frequency preamplifier, and the amplifying circuit of highly sensitive electron detection equipment.
The following provides a specific embodiment of the present invention, it should be noted that the invention is not limited to implement in detail below
Example, all equivalent transformations made on the basis of the technical solutions of the present application each fall within protection scope of the present invention.
A kind of unmanned plane interference method based on digital frequency memory technique, includes the following steps:
Step 1: obtain the signal of communication and navigation signal of unmanned plane using receiving antenna, signal of communication to unmanned plane and
Navigation signal carries out power amplification and obtains S1；
Step 2: down coversion being carried out to S1, S2 is obtained using filtering, S2 is divided into the identical letter of two-way using power splitter
Number, it is transmitted to DLVA all the way, for judging that UAV Communication signal whether there is, another way is transmitted to A/D module and carries out real-time mould
Number is converted to digital signal S3；
Step 3: if DLVA detects that UAV Communication signal exists in step 2, FPGA reads S3 and deposits S3
Chip is stored up, while FPGA transmission alarm signal, to main control unit, main control unit, which issues, starts interference order, and FPGA reads storage core
S3 in piece line number mould of going forward side by side is converted to analog signal S4, enters step 4；If it is logical that unmanned plane is not detected in DLVA in step 2
When believing signal, S3 is not stored in storage chip, and main control unit does not issue interference order；
Step 4: up-conversion being carried out to S4, restores interference signal S5, the service band according to belonging to S5 turns on the switch simultaneously
Selection respective filter is filtered S5, then send into the power amplifier of relevant work wave band filtered S5 and carries out
Power amplification, will be by filtering and the interference signal spoke after power amplification finally by the directional aerial module of relevant work wave band
It is incident upon at unmanned plane and is interfered.Specifically, working frequency range described in step 4 includes L-band, S-band and C-band.
The present invention uses the conflicting mode based on digital frequency memory technique, can generate and signal of communication and navigation signal S1 frequency
The completely the same interference signal of rate, the in this way function of the interference signal of arrival unmanned plane receiving antenna front end and UAV Communication signal
Rate is equal to interfere unmanned plane normal communication, greatly reduce the volume and power consumption of system.Meanwhile regardless of
Which kind of coding mode the unmanned plane of type, signal of communication use, and working frequency points are how many, as long as in service band, Wo Mendou
It can carry out interfering it with the signal of communication of unmanned plane itself.
A kind of unmanned plane interference system based on digital frequency memory technique, including sequentially connected receiving unit, storage unit,
Interference signal generates unit and transmitting unit, further includes the main control unit for connecting storage unit,
The receiving unit includes sequentially connected receiving antenna, low noise amplifier, down conversion module, power splitter and band logical
Filter further includes the DLVA being connected between power splitter and storage unit, and the bandpass filter connects storage unit；
The storage unit includes sequentially connected ADC module, FPGA and storage chip, and the ADC module connects FPGA,
The FPGA connection storage chip, main control unit and interference signal generate unit；
It includes DAC module, up-converter module, local oscillator module and Clock management module, institute that the interference signal, which generates unit,
DAC module connection up-converter module is stated, the local oscillator module connects down conversion module, up-converter module and Clock management module,
The Clock management module connection ADC module and DAC module, the up-converter module connect transmitting unit；
The transmitting unit includes sequentially connected switch, filter module, power amplifier module and directional aerial mould
Block, the filter module include L-band filter, S-band filter and C-band filter, the power amplifier module
Including L-band power amplifier, S-band power amplifier and C-band power amplifier, the directional aerial module includes L wave
Section directional aerial, S-band directional aerial and C-band directional aerial.
The receiving antenna is omnidirectional antenna of the frequency in 1~6GHz, for receiving the signal of communication of unmanned plane and leading
Navigate signal；Omnidirectional antenna shows as 360 ° of all homogeneous radiations on figure in the horizontal direction, non-directional, shows on height pattern
To there is the wave beam of one fixed width, lobe width is smaller under normal circumstances, and gain is bigger.
Since the signal power received is very low, but rear end sampling needs the power of signal higher, therefore, the low noise
The signal that big device is used to receive receiving antenna carries out power amplification；Since the frequency of system work is higher, if directly will be external
Signal is sampled, and needs the sampling clock of 2 times or more that could carry out distortionless sampling to signal according to sampling thheorem, in this way
Requirement to ADC chip is very high, increases the design cost of system, the down conversion module is the signal of input to be changed into
The lower baseband signal of frequency, and then the sampling clock of system is reduced to reduce system design cost.
The low noise amplifier, in the occasion of amplification small-signal, the noise of amplifier itself can to the interference of signal
Can be very serious, therefore, it is desirable to reduce this noise, to improve the signal-to-noise ratio of output.
The power splitter is used to baseband signal being divided into the equal signal of 2 road power, and 1 tunnel is sent to DLVA module, and base is sent on 1 tunnel
Band bandpass filter carries out signal filtering, and DLVA module transmits filtered signal if judging that UAV Communication signal exists
To FPGA；The bandpass filter is for filtering out other unwanted signals generated after down coversion.
The storage unit includes sequentially connected ADC module, FPGA and storage chip, and the ADC module connects FPGA,
The FPGA connection storage chip, main control unit and interference signal generate unit；The ADC module is used for the letter after down coversion
Number analog-to-digital conversion is carried out, then the digital signal after conversion is sent to FPGA to the storage for being used for signal.Due to the sampling of this system
Signal is baseband signal, and therefore, the ADC chip used in this system is the ADC chip of low speed, i.e. the sampling clock that uses of chip
It is lower.
It includes DAC module, up-converter module, local oscillator module and Clock management module, institute that the interference signal, which generates unit,
DAC module connection up-converter module is stated, the local oscillator module connects down conversion module, up-converter module and Clock management module,
The Clock management module connection ADC module and DAC module, the up-converter module connect transmitting unit；
The DAC module is used for the digital signal that will be read in storage chip using the recovered clock as sampling clock
Analog signal, i.e. interference signal are converted to, realizes the undistorted reduction of signal.
The FPGA for realizing local oscillator selection control, the storage and reading of digital signal and with main control unit carry out
The function of communication；
The storage chip is for storing the digital signal after analog-to-digital conversion；
Preferably, storage chip selects DDR chip, and the chip memory rate is not high, but capacity is larger to meet this system
It is required that.
The main control unit is the control core of system, and major function is as follows:
(1) function of initializing of software, hardware: the embedded software initialization in control FPGA controls ADC module, DAC
Module and storage chip hardware initialization, guarantee that system can work normally.
(2) System self-test and malfunction coefficient function: system main modular (FPGA, ADC module, DAC module etc.) is equipped with certainly
Checking functions, master control issue self-test order；When these modules break down, fault message is sent to main control unit and shows.
(3) function is arranged in system operational parameters and operating mode: setting interference band, jamming pattern, interference parameter and under
It is sent to FPGA, control system working method.
(4) display function of system operation control and state: issuing beginning, and whether the command control systems such as stopping run；
System current working status is shown；
(5) interface communication function: the communication between FPGA is realized.
Storage chip mainly has DDR and QDR chip using more, can realize the function read while write compared to the former the latter
Can, the storage chip memory rate used in this system is of less demanding, main as long as capacity is larger, therefore uses DDR chip
Wanting function is to store the digital signal after analog-to-digital conversion.
Local vibration source needed for the local oscillator module is used to provide frequency conversion for down conversion module and up-converter module is simultaneously
ADC module and DAC module provide sampling clock.
The Clock management module is used for after the sampling clock that provides local oscillator divided, sent respectively to ADC module and
DAC module is as sampling clock and recovered clock.
The filter module is for filtering out the superfluous signal generated after up-conversion；The power amplifier module is used
In to filtered different-waveband signal of communication and navigation signal carry out power amplification, obtain interference signal, and will interference letter
It number send to directional aerial module；The directional aerial module be used for by with receive UAV Communication signal and navigation signal frequency
The identical interference signal of section is radiated to unmanned plane, is precisely interfered.
The directional aerial module is converted for realizing microwave signal in equipment and free space, the directional aerial
The characteristics of be that radiation at one or on certain several direction is especially strong, and radiates day that is especially weak or being zero in the other direction
Line.
Claims (7)
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| CN112887051A (en) * | 2021-01-11 | 2021-06-01 | 北京无线电计量测试研究所 | Unmanned aerial vehicle remote control signal interference unit and use method thereof |
| CN113612572A (en) * | 2021-08-31 | 2021-11-05 | 扬州宇安电子科技有限公司 | Unmanned aerial vehicle interference system who possesses protect function |
| CN114301571A (en) * | 2022-02-14 | 2022-04-08 | 中国人民解放军陆军工程大学 | A kind of multi-rotor unmanned aerial vehicle countermeasure method and system |
| CN114301571B (en) * | 2022-02-14 | 2024-03-12 | 中国人民解放军陆军工程大学 | A multi-rotor UAV countermeasures method and system |
| CN114706102A (en) * | 2022-03-16 | 2022-07-05 | 扬州宇安电子科技有限公司 | High-power wave beam variable positioning interference device and method thereof |
| CN114706102B (en) * | 2022-03-16 | 2022-11-25 | 扬州宇安电子科技有限公司 | High-power wave beam variable positioning interference device and method thereof |
| CN114845402A (en) * | 2022-04-25 | 2022-08-02 | 中国人民解放军空军通信士官学校 | Communication comb interference resource allocation method and system based on intelligent optimization algorithm |
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