CN106788870B - A kind of interference unit and its control method - Google Patents
A kind of interference unit and its control method Download PDFInfo
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- CN106788870B CN106788870B CN201611089844.3A CN201611089844A CN106788870B CN 106788870 B CN106788870 B CN 106788870B CN 201611089844 A CN201611089844 A CN 201611089844A CN 106788870 B CN106788870 B CN 106788870B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
- H04K3/82—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection
- H04K3/825—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection by jamming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/40—Jamming having variable characteristics
- H04K3/42—Jamming having variable characteristics characterized by the control of the jamming frequency or wavelength
Abstract
The invention discloses a kind of interference units, circuit and transmit circuit occurs including receiving circuit, signal processing circuit, interference signal, the signal output end for receiving circuit and the first signal input part of signal processing circuit connect, first signal output end of signal processing circuit is connected with the signal input part that circuit occurs for interference signal, the signal output end that circuit occurs for interference signal is connected with the second signal input terminal of signal processing circuit, and the second signal output end of signal processing circuit is connected with the signal input part of transmit circuit.The invention also discloses the control methods of the interference unit.It can effectively eliminate the interference signal fallen into receiving antenna array, obtain useful detection signal, and issue interference signal identical with jamming target communication frequency, form the strong jamming to jamming target, make jamming target that can not carry out normal pass, it is thoroughly out of hand, and its circuit structure more simple optimization.
Description
Technical field
The invention belongs to information perturbation technique field more particularly to a kind of interference unit and its control methods.
Background technique
With the continuous development of electronic information technology, interference unit is as a kind of active interference source also by more and more utilizations
In technical fields such as information securities, such as in message transmitting procedure, the interference signal that interference unit issues is coupled to the letter of transmission
In number, makes non-recipient be difficult to steal true transmission signal, achieve the purpose that information transmission security；For another example, interference unit by with
In fields such as radar, unmanned plane and anti-unmanned planes, the purpose of scouting with interference is realized.
If interference and scouting work at the same time, there is scout receiving antenna and interfere the transceiver insulation between transmitting antenna
Problem.In interfering process, since operational environment causes interference with the arrangement of system by various limitations, or by airplane jamming
The limitation of the platform of machine, the spacing between dual-mode antenna can not be sufficiently large, interference signal be possible to direct-coupling in space or
Person forms the reconnaissance receiver that multi-path signal enters jammer by the transmitting of surrounding short distance environmental objects, so as to lead
The sensibility in practice for gently then reducing reconnaissance receiver is caused, reconnaissance range is reduced；It is heavy then make jammer internal loopback, formed from
Excitation, can not detect radar signal.
The method of traditional raising receive-transmit isolation such as increases the spacing of dual-mode antenna, reduces the lateral spoke of dual-mode antenna
It penetrates and increases orthogonal absorbability isolated screen between dual-mode antenna, or directly transceiver part is isolated, such as the number of applying for a patent is
CN201510055000.6 patent name is the patent of invention of " a kind of to forward deception formula GPS interference system and its interference method ",
Directly transceiver part is isolated and is connected by Transmission system, has not only avoided transceiver insulation problem, but also solve remote transmission
Problem, regeneration delay cheating interference signal power is small, is not only not easy to be detected, and can be realized it is far it is effective interfere away from
From.
But conventional method is still unable to satisfy chain-wales jammer to the high request of isolation, it is therefore desirable to find one
Kind effectively weakens interference signal to the method for receiving systematic influence is scouted, and increase jammer receive-transmit isolation is repeating jamming skill
Art major issue urgently to be solved.Meanwhile traditional interference unit, circuit structure is complicated, not enough optimizes, and interference effect is not
It is good.
Summary of the invention
Based on this, in view of the above-mentioned problems, can effectively eliminate and fall into it is necessary to propose a kind of interference unit and its control method
Enter the interference signal in receiving antenna array, obtain useful detection signal, and issues identical with jamming target communication frequency dry
Signal is disturbed, the strong jamming to jamming target is formed, makes jamming target that can not carry out normal pass, it is thoroughly out of hand, and its electricity
Line structure more simple optimization.
The technical scheme is that a kind of interference unit, including receive circuit, signal processing circuit, interference signal and occur
First signal input part of circuit and transmit circuit, the signal output end for receiving circuit and signal processing circuit connects,
First signal output end of signal processing circuit is connected with the signal input part that circuit occurs for interference signal, and electricity occurs for interference signal
The signal output end on road is connected with the second signal input terminal of signal processing circuit, the second signal output end of signal processing circuit
It is connected with the signal input part of transmit circuit.
In the present invention, it is preferable that the signal processing circuit includes the dsp processor for being in communication with each other connection and adaptive filter
Wave device；First signal input part of dsp processor is connected with the signal output end for receiving circuit, and the first of dsp processor
Signal output end is connected with the input terminal that circuit occurs for the interference signal；First signal input part of sef-adapting filter and dry
The output end for disturbing signal generating circuit is connected, and the signal of the first signal output end and the transmit circuit of sef-adapting filter is defeated
Enter end to be connected.
In the present invention, it is preferable that it includes noise emission device, frequency mixer and from concussion harmonic wave that circuit, which occurs, for the interference signal
Transmitter, the signal input part of noise emission device are connected with the first signal output end of the dsp processor, noise emission device
Signal output end is connected with the first signal input part of frequency mixer, the signal output end of frequency mixer and the sef-adapting filter
First signal input part is connected, and is connected from the signal output end for shaking harmonic emissions device with the second signal input terminal of frequency mixer.
In the present invention, it is preferable that the reception circuit includes the receiving antenna array successively communicated to connect, low-pass filter
And converter, the signal output end of converter are connect with the first signal input part of the signal processing circuit.
In the present invention, it is preferable that the transmit circuit includes the radio-frequency power amplifier successively communicated to connect, bandpass filtering
Device and interference transmitting antenna, the second signal output end of the signal input part of radio-frequency power amplifier and the signal processing circuit
Connection.
The invention also discloses the control methods of above-mentioned interference unit, include the following steps:
A. it obtains and receives the external signal d that circuit real-time reception arrives, meanwhile, it obtains frequency mixer and generates interference signal, as
With reference to interference signal J, b is entered step；
B. this is handled with reference to interference signal J through sef-adapting filter, obtains filtered output signals Y, and the filtering is defeated
Signal Y inversely adds in dsp processor with the external signal out, obtains filtered output signals Y and external signal d
Between error signal e, enter step c；
C. the mean square error E { e of the error signal e is calculated2, and judge mean square error E { e2Whether default threshold is less than
Value, if then filtered output signals Y is sent to transmit circuit and is launched outward when as external interference signals, and by the error
Signal e is as the useful detection signal in external signal d；Otherwise d is entered step；
D. the error signal e is fed back in sef-adapting filter, and adaptive-filtering is adjusted according to the error signal e
The data processing method of device, return step b.
In the present invention, it is preferable that the weight vector W in the sef-adapting filter is defined as W=[W0, W1..., Wj]T,
Wherein, WjFor the weight of jth root receiving antenna on the receiving antenna array, T is the conjugate transposition of weight vector W, and initializes
Weight vector and iteration convergence step-size factor specifically comprise the following steps: in the step b
B1. it is handled described with reference to interference signal J through sef-adapting filter, according to Y=JWWhen previous, WWhen previousIt indicates by step
The weight vector for working as previous iteration during rapid a to step d circulate operation, obtains filtered output signals Y, enters step b2；
B2. according to e=d-Y, filtered output signals Y and external signal d is inversely added, it is defeated to obtain the filtering
Error signal e between signal Y and external signal d out, enters step b3；
B3. according to WNext time=WWhen previous+2μWhen previousE.J obtains WNext time, during step a to step d circulate operation
The weight vector of next iteration, wherein μWhen previousFor the iteration convergence for working as previous iteration during step a to step d circulate operation
Step-size factor；According to μNext time=α μWhen previous+β·e2, obtain μNext time, as next during step a to step d circulate operation
The iteration convergence step-size factor of secondary iteration, and enter step c, wherein α and β is parameter preset, and 0 < α < 1, β > 0.
In the present invention, it is preferable that the sef-adapting filter is digital delay sef-adapting filter.
The beneficial effect of the technical program is:
(1) in the prior art, minimize transmitting-receiving when transmitting antenna and receiving antenna work at the same time on interference unit every
From problem, by the way that sef-adapting filter is arranged in interference unit, design uses active digital adaptive canceling technology, utilizes correlation
Principle is offseted, adjustment convergence step-length effectively realizes the convergence rate and convergence stability in adaptive interference cancellation algorithm
Compromise, can finally effectively eliminate the interference signal fallen into detecting antenna, obtain useful detection signal；
(2) capable of emitting interference signal identical with jamming target communication frequency forms the strong jamming to jamming target, makes to do
Normal pass can not be carried out by disturbing target, thoroughly out of hand, and its circuit structure more simple optimization；
(3) according to digital delay sef-adapting filter dynamic adjustment convergence step-length, finally digital delay is adaptively filtered
The output of wave device approaches said external interference signal through analyzing on mean square meaning, launches outward including the radar jammer
The interference signal signal that direct-coupled signal and the interference signal are reflected through environmental objects in space, and as number
The another way of delayed adaptation filter inputs, and the input of final digital delay sef-adapting filter is the radar for needing to detect receipts
Signal can greatly improve scouting and interference effect；
(4) for coarse delay institute's irrealizable delay time, that is, be less than coarse delay precision time then pass through it is micro-
Receiving antenna array is adjusted with interference transmitting antenna distance to realize, several millimeters of essence can be achieved in the distance adjustment of fine adjustment stage
Degree, it can be achieved that be less than nanosecond time delay, substantially increase the precision of delay time, reach preferably scout with interference imitate
Fruit.
Detailed description of the invention
Fig. 1 is the functional block diagram of interference unit in embodiment；
Description of symbols:
10 receive circuit, 101 receiving antenna arrays, 102 low-pass filters, 103 converters, 20 signal processings
Circuit occurs for circuit, 201 dsp processors, 202 sef-adapting filters, 30 interference signals, and 301 noise emission devices, 302 is mixed
Frequency device, 303 from concussion harmonic emissions device, 40 transmit circuits, 401 video power amplifiers, 402 bandpass filters, 403
Interfere transmitting antenna.
Specific embodiment
The embodiment of the present invention is described in detail with reference to the accompanying drawing.
Embodiment 1
With reference to Fig. 1, a kind of interference unit, including receive circuit 10, signal processing circuit 20, interference signal occur circuit 30 with
And transmit circuit 40, the signal output end for receiving circuit 10 are connect with the first signal input part of signal processing circuit 20,
First signal output end of signal processing circuit 20 is connected with the signal input part that circuit 30 occurs for interference signal, interference signal hair
The signal output end of raw circuit 30 is connected with the second signal input terminal of signal processing circuit 20, and the second of signal processing circuit 20
Signal output end is connected with the signal input part of transmit circuit 40.
In another embodiment, the signal processing circuit 20 include be in communication with each other connection dsp processor 201 and from
Adaptive filter 202；First signal input part of dsp processor 201 is connected with the signal output end for receiving circuit 10,
First signal output end of dsp processor 201 is connected with the input terminal that circuit 30 occurs for the interference signal；Sef-adapting filter
202 the first signal input part is connected with the output end that circuit 30 occurs for interference signal, the first signal of sef-adapting filter 202
Output end is connected with the signal input part of the transmit circuit 40.
In another embodiment, it includes noise emission device 301,302 and of frequency mixer that circuit 30, which occurs, for the interference signal
From concussion harmonic emissions device 303, the first signal of the signal input part of noise emission device 301 and the dsp processor 201 is exported
End is connected, and the signal output end of noise emission device 301 is connected with the first signal input part of frequency mixer 302, the letter of frequency mixer 302
Number output end is connected with the first signal input part of the sef-adapting filter 202, defeated from the signal for shaking harmonic emissions device 303
Outlet is connected with the second signal input terminal of frequency mixer 302.
In another embodiment, the circuit 10 that receives includes the receiving antenna array 101 successively communicated to connect, low pass
Filter 102 and converter 103, the first signal of the signal output end of converter 103 and the signal processing circuit 20
Input terminal connection.
In another embodiment, the transmit circuit 40 includes radio-frequency power amplifier 401, the band successively communicated to connect
Bandpass filter 402 and interference transmitting antenna 403, the signal input part of radio-frequency power amplifier 401 and the signal processing circuit
20 second signal output end connection.
When work, the external signal d after reception circuit 10 will receive and process issues dsp processor 201, later in DSP
Fourier transformation is carried out in processor 201, can judge the working frequency of jamming target, and noise emission device 301 is generated and done
The identical interference signal of target operating frequency is disturbed, can produce the waveform signal of frequency richness, warp from harmonic oscillator 303 is shaken
Cross after frequency mixer the frequency range that can cover 40Mhz---1Ghz, the signal after mixing by sef-adapting filter 202 and DSP at
After managing the adjustment of device 201, the useful signal e in external signal d may recognize that, and capable of emitting identical with jamming target communication frequency
Interference signal Y forms the strong jamming to jamming target, makes jamming target that can not carry out normal pass, thoroughly out of hand, and its
Circuit structure more simple optimization.
The invention also discloses the control methods of above-mentioned interference unit, include the following steps:
A. it obtains and receives the external signal d that circuit real-time reception arrives, meanwhile, it obtains frequency mixer and generates interference signal, as
With reference to interference signal J, b is entered step；
B. this is handled with reference to interference signal J through sef-adapting filter, obtains filtered output signals Y, and the filtering is defeated
Signal Y inversely adds in dsp processor with the external signal out, obtains filtered output signals Y and external signal d
Between error signal e, enter step c；
C. the mean square error E { e of the error signal e is calculated2, and judge mean square error E { e2Whether default threshold is less than
Value, if then filtered output signals Y is sent to transmit circuit and is launched outward when as external interference signals, and by the error
Signal e is as the useful detection signal in external signal d；Otherwise d is entered step；
D. the error signal e is fed back in sef-adapting filter, and adaptive-filtering is adjusted according to the error signal e
The data processing method of device, return step b.
In another embodiment, the weight vector W in the sef-adapting filter, is defined as W=[W0, W1..., Wj]T,
Wherein, WjFor the weight of jth root receiving antenna on the receiving antenna array, T is the conjugate transposition of weight vector W, and initializes
Weight vector and iteration convergence step-size factor specifically comprise the following steps: in the step b
B1. it is handled described with reference to interference signal J through sef-adapting filter, according to Y=JWWhen previous, WWhen previousIt indicates by step
The weight vector for working as previous iteration during rapid a to step d circulate operation, obtains filtered output signals Y, enters step b2；
B2. according to e=d-Y, filtered output signals Y and external signal d is inversely added, it is defeated to obtain the filtering
Error signal e between signal Y and external signal d out, enters step b3；
B3. according to WNext time=WWhen previous+2μWhen previousEJ obtains WNext time, during step a to step d circulate operation
The weight vector of next iteration, wherein μWhen previousFor the iteration convergence for working as previous iteration during step a to step d circulate operation
Step-size factor；According to μNext time=α μWhen previous+β·e2, obtain μNext time, as next during step a to step d circulate operation
The iteration convergence step-size factor of secondary iteration, and enter step c, wherein α and β is parameter preset, and 0 < α < 1, β > 0.
In another embodiment, the sef-adapting filter is digital delay sef-adapting filter.
In the above method, for the interference cancellation algorithm of adaptive-filtering, there is the convergence rates of iterative process
And stability problem, wherein convergence rate, influences the system time of interference cancellation processing, directly decides whether to accomplish to receive and dispatch
It carries out simultaneously；And stability is determined by the validity and convergence of interference cancellation algorithm, and interference cancellation is directly influenced
Effect.Therefore, biggish iteration convergence step-size factor generally should be selected as far as possible under the premise of guaranteeing interference cancellation algorithmic statement
μ enhances the practical application value of adaptive interference cancellation system to improve convergence rate.Meanwhile also to consider due to step-length because
Misadjustment noise caused by son is excessive is excessive, to reduce the performance of cancellation system.More by adjusting receipts iteration convergence step-size factor
Parameter alpha and β in new formula, reach better trade-off between convergence rate and steady output rate.
The specific embodiment invented above described embodiment only expresses, the description thereof is more specific and detailed, but not
It can therefore be construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from inventive concept, various modifications and improvements can be made, these belong to the protection scope of invention.
Claims (3)
1. a kind of control method of interference unit, the interference unit includes receiving circuit, signal processing circuit, interference signal electricity occurs
First signal input part of road and transmit circuit, the signal output end for receiving circuit and signal processing circuit connects, letter
First signal output end of number processing circuit is connected with the signal input part that circuit occurs for interference signal, interference signal generation circuit
Signal output end be connected with the second signal input terminal of signal processing circuit, the second signal output end of signal processing circuit with
The signal input part of transmit circuit is connected;
The signal processing circuit includes the dsp processor and sef-adapting filter for being in communication with each other connection；The first of dsp processor
Signal input part is connected with the signal output end for receiving circuit, the first signal output end of dsp processor and the interference
The input terminal of signal generating circuit is connected；The output of circuit occurs for the first signal input part and interference signal of sef-adapting filter
End is connected, and the first signal output end of sef-adapting filter is connected with the signal input part of the transmit circuit；
The interference signal occurs circuit and includes noise emission device, frequency mixer and shake harmonic emissions device certainly, noise emission device
Signal input part is connected with the first signal output end of the dsp processor, the signal output end and frequency mixer of noise emission device
The first signal input part be connected, the first signal input part phase of the signal output end of frequency mixer and the sef-adapting filter
Even, it is connected from the signal output end for shaking harmonic emissions device with the second signal input terminal of frequency mixer；
The reception circuit includes the receiving antenna array, low-pass filter and converter successively communicated to connect, converter
Signal output end connect with the first signal input part of the signal processing circuit；
It is characterized by comprising the following steps:
A. it obtains and receives the external signal d that circuit real-time reception arrives, meanwhile, it obtains frequency mixer and generates interference signal, as reference
Interference signal J, enters step b；
B. this is handled with reference to interference signal J through sef-adapting filter, obtains filtered output signals Y, and the filtering is exported and is believed
Number Y inversely adds in dsp processor with the external signal, obtains between filtered output signals Y and external signal d
Error signal e, enter step c；
C. the mean square error E { e of the error signal e is calculated2, and judge mean square error E { e2Whether preset threshold is less than, if
It is that filtered output signals Y be sent to transmit circuit and launched outward when as external interference signals, and by the error signal e
As the useful detection signal in external signal d；Otherwise d is entered step；
D. the error signal e is fed back in sef-adapting filter, and sef-adapting filter is adjusted according to the error signal e
Data processing method, return step b.
2. the control method of interference unit according to claim 1, it is characterised in that: the weight vector in the sef-adapting filter
W is defined as W=[W0, W1 ..., Wj]T, wherein wj is the weight of jth root receiving antenna on the receiving antenna array, and T is
The conjugate transposition of weight vector W, and weight vector and iteration convergence step-size factor are initialized, following step is specifically included in the step b
It is rapid:
B1. handled described with reference to interference signal J through sef-adapting filter, according to Y=JW when previous, W when it is previous indicate by
Work as the weight vector of previous iteration during step a to step d circulate operation, obtains filtered output signals Y, enter step b2；
B2. according to e=d-Y, filtered output signals Y and external signal d are inversely added, obtain filtering output letter
Error signal e number between Y and external signal d, enters step b3；
B3. according to W next time=W when previous+2 μ work as previous e .J, obtain W next time, as step a to step d recycle
In operating process next time
The weight vector of iteration, wherein μ is received when the previous iteration for working as previous iteration in the process for step a to step d circulate operation
Length of slowing down one's steps system
Number；According to μ next time=α μ work as previous+β e2,
It obtains μ next time, changes next time in the process as step a to step d circulate operation
The iteration convergence step-size factor in generation, and enter step c, wherein α and β is parameter preset, and 0 < α < 1, β > 0.
3. the control method of interference unit according to claim 1 or claim 2, it is characterised in that: the sef-adapting filter is number
Delayed adaptation filter.
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| CN108377154B (en) * | 2018-02-05 | 2020-07-28 | Oppo广东移动通信有限公司 | Harmonic suppression device, harmonic suppression method, and electronic device |
| CN108521315A (en) * | 2018-04-08 | 2018-09-11 | 北京东远润兴科技有限公司 | Interference simulator and data link reliability assist verification system |
| CN111835368B (en) * | 2020-07-31 | 2022-11-18 | 海能达通信股份有限公司 | Zero intermediate frequency receiving system |
| CN113014355B (en) * | 2020-12-22 | 2022-02-01 | 四川九洲电器集团有限责任公司 | Vehicle-mounted active and passive combined broadband interference system |
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| CN105313769A (en) * | 2015-10-14 | 2016-02-10 | 武汉理工大学 | Vehicle active forewarning method, system and device based on millimeter wave radar |
| CN106154262A (en) * | 2016-08-25 | 2016-11-23 | 四川泰立科技股份有限公司 | Anti-unmanned plane detection system and control method thereof |
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| CN201549601U (en) * | 2009-11-06 | 2010-08-11 | 航天科工惯性技术有限公司 | Cascade type anti-jamming satellite navigation antenna |
| CN104678365A (en) * | 2015-03-20 | 2015-06-03 | 河海大学 | Adaptive interference cancellation method for radar jammer |
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| CN105313769A (en) * | 2015-10-14 | 2016-02-10 | 武汉理工大学 | Vehicle active forewarning method, system and device based on millimeter wave radar |
| CN106154262A (en) * | 2016-08-25 | 2016-11-23 | 四川泰立科技股份有限公司 | Anti-unmanned plane detection system and control method thereof |
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