CN101262300A - Chaos interference system for chaos synchronization - Google Patents

Chaos interference system for chaos synchronization Download PDF

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Publication number
CN101262300A
CN101262300A CNA2008100614347A CN200810061434A CN101262300A CN 101262300 A CN101262300 A CN 101262300A CN A2008100614347 A CNA2008100614347 A CN A2008100614347A CN 200810061434 A CN200810061434 A CN 200810061434A CN 101262300 A CN101262300 A CN 101262300A
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chaos
circuit
signal
microwave
signals
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CN101262300B (en
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冉立新
姜涛
乔闪
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The invention discloses a chaos interference system utilizing chaos synchronization. A chaos interference transmitter: chaos oscillation from a microwave chaos signal source and communication signals from a communication signal source are sent into an transmitting antenna through a frequency mixer and a power amplifier; an identifiable receiver: signals received by the antenna are received, amplified by a low-noise amplifier and sent into a self-adaptive filter circuit, then one stream of signals are connected with one input end of a subtracter while the other stream of signals are connected with the other input end of the subtracter through a microwave chaos synchronous circuit; the output end of the subtracter is connected with communication signals required by a low-pass filter for outputting. Signals generated by a Colpitts circuit are taken as signals of interference source and as carrier signals for communication of a self party; in the receiver, received signals are used for driving another microwave chaos circuit, and microwave chaos signals which are the same as transmitted interference signals are obtained; the signals can be identified by home party in case of interference from opponent. The system of the invention has the advantages of high confidentiality, good noise and interference resistance, liability to identification by the home party and simple back-end data processing.

Description

Utilize the synchronous CHAOTIC INTERFERENCE system of chaos
Technical field
The present invention relates to disturb and the structure of communication system, especially relate to a kind of synchronous CHAOTIC INTERFERENCE system of chaos that utilizes.
Background technology
Along with the develop rapidly of high-tech, the core support effect of electronic technology in military and civilian is more and more obvious, and particularly modern war has more aggravated the antagonism in electromagnetism field.Therefore situation of battlefield is fast changing, and information interchange is more frequent, must ensure at any time that communication is unimpeded, has strong antijam communication and the Communication Jamming instrument seems particularly important.Under the information battlefield surroundings, opposing sides' communication or interference all are to rely on taking or hindering and damaging and achieve the goal frequency domain, time domain, level territory and spatial domain.The transmission medium of communication and the enforcement medium of interference have been formed in these territories.
Covert communications can be studied from time domain, frequency domain, three aspects, spatial domain respectively, has currently all obtained certain achievement aspect these three.Under the certain situation of channel capacity, bandwidth, transmission time and signal to noise ratio can be changed mutually.Information capacity and bandwidth are linear, become logarithmic relationship with power.If reduce the power of signal, improve the rate of information throughput simultaneously again, reduce the possibility of being scouted, under the situation that noise can not reduce, have only the increase bandwidth.The wide-band spread spectrum technology utilizes this principle to launch covert communications at frequency domain exactly, just use the high speed pseudo noise code that the information code current that needs transmit is carried out band spectrum modulation, the feasible signal bandwidth that is used for transmitting is much larger than the bandwidth of information itself, reduce and the power level of signal is corresponding, can reach signal power level in the transmission course less than the degree of noise level, thereby reach the purpose of covert communications.
Have tracking mode interference, broadband barrage jamming, pectination commonly used are composed interference, spot jamming etc.No matter various anti-interference and perturbation techniques in development constantly, with current Communication Jamming technology and means, are general communication or present spread spectrum communication system still, all might be disturbed effectively; Simultaneously each is disturbed, the communication mode of anti-this interference is all arranged.Disturbing by the emission broadband noise signal, increase the ground noise of signal of communication, signal of communication is submerged in the broadband noise, is the most effective conflicting mode.
The generation in ultra broadband, noise-like signal source mainly contains three kinds of schemes at present: (1) obtains by the noise in the amplification electron circuit; (2) by low frequency or intermediate frequency chaotic signal are carried out the spread spectrum acquisition by nonlinear method; (3) use optics to produce the optical ignorant signal, obtain the signal of ultra broadband, noise like by the chaos signal of telecommunication of opto-electronic conversion acquisition microwave frequency band.Compare with these three kinds of schemes, use directly the chaotic signal that produces at microwave frequency band as the scheme of ultra broadband interference source signal can so that system configuration realize simple, handle convenient.Chaotic signal is the class random signal that deterministic system produces, the application study of chaos at present mainly concentrates on the mechanism of production and the synchronization aspects of arrowband chaotic signal. and the broadband chaotic signal is a kind of desirable signals of communications applications because of its randomness and good correlation properties.
Summary of the invention
The object of the present invention is to provide a kind of synchronous CHAOTIC INTERFERENCE system of chaos that utilizes.Microwave chaotic signal time domain has natural noise like characteristic, and frequency domain has natural broadband character, and the low cost that is easy to simple in structure realizes, is used as the CHAOTIC INTERFERENCE source signal and has good technical advantage.Simultaneously, chaos drives chaotic signal to input synchronously and has certain noise remove function, introduces the chaos Synchronous Processing in the interference receiver can discerning, can the place to go chaotic noise to self interference.
The technical solution adopted for the present invention to solve the technical problems is:
Comprise the CHAOTIC INTERFERENCE transmitter section and can discern receiver section, wherein:
1) CHAOTIC INTERFERENCE transmitter section: comprise microwave chaotic signal source circuit, signal of communication source circuit, frequency mixer, power amplifier and transmitting antenna; The signal of communication that chaotic oscillation that microwave chaotic signal source circuit produces and signal of communication source circuit produce is sent to transmission antennas transmit by frequency mixer, power amplifier amplification;
2) can discern receiver section: comprise reception antenna, low noise amplifier, auto-adaptive filter circuit, microwave chaos synchronous circuit, subtracter and low pass filter; After signal receives from reception antenna, through low noise amplifier, signal after the amplification is sent into auto-adaptive filter circuit, auto-adaptive filter circuit is divided into two the tunnel, one the tunnel connects an input of subtracter, another road connects another input of subtracter through microwave chaos synchronous circuit, the low-pass filter of output termination of subtracter, the signal of communication that low pass filter output needs.
Described microwave chaotic signal source circuit and microwave chaos synchronous circuit all adopt examines the BZ circuit.
Described subtracter is to adopt the LM158 operational amplifier.
The useful effect that the present invention has is:
Use microwave Colpitts chaos circuit as interference signal source, can produce the continuous frequency spectrum from the direct current to the microwave frequency band, have that circuit structure is simple, a stable performance, advantages of cheap price.In the chaos receiver, carry out the synchronous processing of chaos, the noise in the echo chaotic signal that can suppress to receive, the correlation of chaotic signal that obtains and source chaotic signal improves, and the easier recovery of signal of communication is come out.From the angle of Electronic Design, the realization of receiver has been simplified by system on the basis that does not have large increase transmitter design complexity simultaneously.The advantage of system: send the signal power spectrum density low, can hold that the multi-user uses, the transceiver cost is low or the like.Identical chaos locus can be realized synchronously and be produced to the chaos system of two couplings, and this just provides possibility for the information of recovering to be modulated on the chaotic carrier.Consider aperiodicity and confidentiality that chaotic signal is good, people begin chaos to be used to communicate by letter and to have proposed a series of communication plans based on chaos, on the other hand, thereby the introducing of chaos makes information be difficult for being intercepted and captured the confidentiality that has strengthened system more, eliminated the multipath interference, the chaotic signal in broadband also is good interference source for objects interfered simultaneously.Can in one's own side's communication, realize effective interference of the enemy of team.
Simultaneously, the chaos synchronous circuit of utilization and radiating circuit identical parameters is as receiving circuit, because chaos has certain functions such as noise removing to the chaotic signal that receives synchronously, in in the chaos receiver, if earlier chaotic signal is sent into oscillator through Synchronous Processing, obtain identical chaotic signal, subtract each other with the chaotic signal and the signal of communication that send again, can obtain useful signal of communication, this microwave CHAOTIC INTERFERENCE signal is the noise-like signal in broadband for the enemy, and concerning we, can be used as the carrier wave of we's signal of communication, microwave chaos synchronous circuit by at receiver can obtain useful signal of communication.
Description of drawings
Fig. 1 is the interference the discerned chaos system that utilizes chaos synchronous.
Fig. 2 is the subtracter that utilizes operational amplifier to realize.
Fig. 3 is the Colpitts circuit theory diagrams.
Fig. 4 is the positive supply circuit.
Fig. 5 is the negative supply circuit.
Among the figure: 1, microwave chaotic signal source circuit, 2, the signal of communication source circuit, 3, frequency mixer, 4, power amplifier, 5, transmitting antenna, 6, reception antenna, 7, low noise amplifier, 8, auto-adaptive filter circuit, 9, microwave chaos synchronous circuit, 10, subtracter, 11, low pass filter.
Embodiment
As shown in Figure 1, the present invention includes microwave CHAOTIC INTERFERENCE transmitter section and can discern receiver section.Wherein:
1) microwave CHAOTIC INTERFERENCE transmitter section: comprise microwave chaotic signal source circuit 1, signal of communication source circuit 2, frequency mixer 3, power amplifier 4 and transmitting antenna 5; The signal of communication that chaotic oscillation that microwave chaotic signal source circuit 1 produces and signal of communication source circuit 2 produce is sent to transmitting antenna 5 emissions by frequency mixer 3, power amplifier 4 amplifications;
2) can discern receiver section: comprise reception antenna 6, low noise amplifier 7, auto-adaptive filter circuit 8, microwave chaos synchronous circuit 9, subtracter 10 and low pass filter 11; After signal receives from reception antenna 6, through low noise amplifier 7, signal after the amplification is sent into auto-adaptive filter circuit 8, auto-adaptive filter circuit (8) is divided into two the tunnel, one the tunnel connects an input of subtracter 10, another road connects another input of subtracter 10 through microwave chaos synchronous circuit 9, the low-pass filter of output termination 9 of subtracter 10, the signal of communication that low pass filter 9 outputs need.
Described microwave chaotic signal source circuit 1 and microwave chaos synchronous circuit 9 all adopt examines BZ (Colpitts) circuit.
Described subtracter 10 is to adopt the LM158 operational amplifier.
Microwave chaotic signal source circuit uses the Colpitts circuit to produce the above microwave chaotic signal of fundamental frequency 5GHz, and output signal is sent to amplifying circuit with the signal of communication of modulation, sends into transmitting antenna after amplifying.
The signal of EVAC (Evacuation Network Computer Model) emission is received antenna and receives that at first send into amplifying circuit, the signal after the amplification carries out the processing of auto-adaptive filter circuit, and the signal after the processing is sent into microwave chaos synchronous circuit and carried out Synchronous Processing.The output and the received signal of microwave chaos synchronous circuit are subtracted each other, and promptly obtain useful signal of communication.
Use the method for the microwave chaotic signal of microwave Colpitts circuit generation as the radar source signal:
1) uses directly the microwave chaos signal source that produces at microwave frequency band source signal as the EVAC (Evacuation Network Computer Model) transmitter.Because the fundamental frequency of signal is at microwave frequency band, signal has enough bandwidth;
2) generation of chaotic signal frequently of microwave ripple is adopted and is examined BZ (Colpitts) oscillating circuit, and the Colpitts circuit can be operated in the chaotic oscillation state, this moment its output signal spectrum distribution from direct current to a upper limiting frequency f UBetween, for a given upper limiting frequency f U, for producing chaotic oscillation, the main circuit parameter of Colpitts circuit need meet the following conditions:
C 1 = ( 1 - k ) 1.1 I 0 Q 2 π V T g * f U - C c - C re - - - ( 1 )
C 2 = 0.6 k I 0 Q π V T g * f U - C e - C re - - - ( 2 )
L = 1.1 V T g * 2 π k 2 I 0 Q f U - - - ( 3 )
R = V T g * k 2 I 0 Q 2 - - - ( 4 )
G in the formula *Be the oscillator open-loop gain, k is for regulating the scaling factor of two electric capacity values, the quality factor when Q is the chaotic oscillator zero load.I 0Be the electric current of current source, V TBe at room temperature to be 26mV, C e, C c, C ReBe respectively transistor emitter, the parasitic capacitance of collector electrode and feedback circuit.
The circuit of power unit such as Fig. 4, shown in 5, be respectively LT1762 and the LT1964 both positive and negative low pressure difference linear voltage regulator that utilizes Linear company, input voltage is respectively positive 20 volts and negative 20 negative, can adjust output voltage range by adjustable resistance is respectively positive and negative 3～20 volts, in order to the input voltage of Colpitts circuit to be provided, suitably adjusts variable resistor, make the input voltage of adjusting the Colpitts circuit, can make the Colpitts circuit working at chaos state.
Microwave chaos receiver section uses the microwave chaos to carry out pretreated method synchronously:
The method that proposes among the present invention is, after " adaptive-filtering " module, earlier signal is used for driving and sending the same microwave chaos circuit of part, the microwave chaotic signal that the acquisition process is synchronous is sent to subtraction block again with this microwave chaotic signal and received signal is handled.Microwave chaos synchronous circuit is to the processing of input signal, and the noise in the filtering echo to a great extent improves the correlation of the microwave chaotic signal that echo-signal and microwave chaos synchronous circuit export.
The microwave chaotic signal source circuit 1 of microwave CHAOTIC INTERFERENCE transmitter section is used Colpitts microwave chaos circuit, and the schematic diagram of Colpitts circuit as shown in Figure 3.The Colpitts circuit that is operated in microwave frequency band can produce chaotic oscillation under the condition that satisfies formula (1) (2) (3) (4).Signal of communication is produced by signal of communication source circuit 2, is modulated at by frequency mixer 3 on the signal of microwave chaotic signal source circuit generation, through the power amplifier 4 in the transmitter.The output of amplifying circuit in the transmitter is sent to transmitting antenna 5 and launches.
The amplifier 4 of radiating portion is west, a Chengdu section microwave power amplifier, and model is XKLA1018N4020, and operating frequency range is 1～18GHz, gain 30dB.Transmitting antenna 5 and reception antenna 6 can adopt the Xi'an perseverance to reach the two ridged horn mouth antennas of ultra broadband, and model is HD10180DRHA, operating frequency 1～18GHz, and gain 10～17dB, 10～50 ° of half-power beam widths make it satisfy the requirement of wideband operation.
Can discern receiver section, signal at first is admitted to low noise amplifier 7 after receiving from reception antenna 6, carries out high-gain low-noise and amplifies.Signal after the amplification is sent into auto-adaptive filter circuit 8.To a certain degree after the filtering, signal is sent into microwave chaos synchronous circuit 9 at the outer quilt that disturbs of noise and band.The output of microwave chaos synchronous circuit and the microwave chaotic signal that receives are sent to subtracter 10 with signal of communication and subtract each other, and promptly obtain the signal of communication that needs.
The antenna 6 of receiver section adopts the ultra broadband two ridged horn mouth antennas same with radiating portion.The low noise amplifier 7 of receiver section uses west, Chengdu section microwave low-noise amplifier, and model is XKLA1018N4009, and operating frequency range is 1～18GHz, gain 30dB.
Subtraction circuit is that the subtraction circuit that utilizes the LM158 operational amplifier of TI company to realize realizes that subtracter is output as the poor of two input signals, and with the input signal homophase, as shown in Figure 2.
Auto-adaptive filter circuit 8 is mainly used to filtering out-of-band noise and interference, can use ready-made product, also can use the capacitance resistance inductive circuit to design according to the requirement of passband and stopband signal voluntarily.The Colpitts microwave chaos circuit that microwave chaos synchronous circuit 9 adopts and radiating portion has same parameter, circuit theory diagrams as shown in Figure 3.This microwave chaos circuit is received and treated echo-signal drives, and the synchronous microwave chaotic signal of generation is sent into subtracter 10 as output.The processing of microwave chaos synchronous circuit 9, the noise effect in can effectively filtering echo-signal obtains and identical microwave chaotic signal.

Claims (3)

1. one kind is utilized the synchronous CHAOTIC INTERFERENCE system of chaos, it is characterized in that: comprise microwave CHAOTIC INTERFERENCE transmitter section and can discern receiver section, wherein:
1) microwave CHAOTIC INTERFERENCE transmitter section: comprise microwave chaotic signal source circuit (1), signal of communication source circuit (2), frequency mixer (3), power amplifier (4) and transmitting antenna (5); The signal of communication that chaotic oscillation that microwave chaotic signal source circuit (1) produces and signal of communication source circuit (2) produce is sent to transmitting antenna (5) emission by frequency mixer (3), power amplifier (4) amplification;
2) can discern receiver section: comprise reception antenna (6), low noise amplifier (7), auto-adaptive filter circuit (8), microwave chaos synchronous circuit (9), subtracter (10) and low pass filter (11); After signal receives from reception antenna (6), through low noise amplifier (7), signal after the amplification is sent into auto-adaptive filter circuit (8), auto-adaptive filter circuit (8) is divided into two the tunnel, one the tunnel connects an input of subtracter (10), another road connects another input of subtracter (10) through microwave chaos synchronous circuit (9), the low-pass filter of output termination (9) of subtracter (10), the signal of communication that low pass filter (9) output needs.
2, a kind of synchronous CHAOTIC INTERFERENCE system of chaos that utilizes according to claim 1, it is characterized in that: described microwave chaotic signal source circuit (1) and microwave chaos synchronous circuit (9) all adopt and examine the BZ circuit.
3, a kind of synchronous CHAOTIC INTERFERENCE system of chaos that utilizes according to claim 1 is characterized in that: described subtracter (10) is to adopt the LM158 operational amplifier.
CN2008100614347A 2008-04-30 2008-04-30 Chaos interference system for chaos synchronization Expired - Fee Related CN101262300B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102170346A (en) * 2011-05-18 2011-08-31 华北电力大学 A secure communication method of utilizing an amplitude to realize chaos synchronization
CN104065470A (en) * 2014-05-14 2014-09-24 西安理工大学 Chaos wireless communication and code sending methods
CN106330427A (en) * 2016-08-16 2017-01-11 中国电子科技集团公司第三十八研究所 Darlington structure microwave chaotic circuit, chip, circuit module and design method of Darlington structure microwave chaotic circuit
CN109688078A (en) * 2018-12-24 2019-04-26 长安大学 A kind of weak positive string signal extracting method based on Chaotic Synchronous
CN110086543A (en) * 2019-05-06 2019-08-02 南京瑞贻电子科技有限公司 A kind of anti-tracking communication modulation systems and communication means
CN110166162A (en) * 2019-05-24 2019-08-23 成都创亿世通科技有限公司 Hand-held press device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
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US5321409A (en) * 1993-06-28 1994-06-14 Hughes Missile Systems Company Radar system utilizing chaotic coding
CN100342661C (en) * 2004-07-12 2007-10-10 浙江大学 Super broad band signal generating method and circuit based on chaotic signal broad band characteristic
CN1952685B (en) * 2006-11-10 2010-05-19 浙江大学 Chaotic radar system with chaotic synchronization

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102170346B (en) * 2011-05-18 2014-04-23 华北电力大学 A secure communication method of utilizing an amplitude to realize chaos synchronization
CN102170346A (en) * 2011-05-18 2011-08-31 华北电力大学 A secure communication method of utilizing an amplitude to realize chaos synchronization
CN104065470B (en) * 2014-05-14 2017-05-31 西安理工大学 A kind of chaos radio communication and transmission coding method
CN104065470A (en) * 2014-05-14 2014-09-24 西安理工大学 Chaos wireless communication and code sending methods
CN106330427B (en) * 2016-08-16 2019-05-07 中国电子科技集团公司第三十八研究所 Darlington structure microwave chaos circuit and its chip, circuit module, design method
CN106330427A (en) * 2016-08-16 2017-01-11 中国电子科技集团公司第三十八研究所 Darlington structure microwave chaotic circuit, chip, circuit module and design method of Darlington structure microwave chaotic circuit
CN109688078A (en) * 2018-12-24 2019-04-26 长安大学 A kind of weak positive string signal extracting method based on Chaotic Synchronous
CN109688078B (en) * 2018-12-24 2021-06-08 长安大学 Weak sine signal extraction method based on chaotic synchronization
CN110086543A (en) * 2019-05-06 2019-08-02 南京瑞贻电子科技有限公司 A kind of anti-tracking communication modulation systems and communication means
CN110086543B (en) * 2019-05-06 2020-01-03 南京瑞贻电子科技有限公司 Anti-tracking communication modulation system and communication method
CN111147151A (en) * 2019-05-06 2020-05-12 南京瑞贻电子科技有限公司 Anti-tracking communication modulation system and communication method
CN110166162A (en) * 2019-05-24 2019-08-23 成都创亿世通科技有限公司 Hand-held press device
CN110166162B (en) * 2019-05-24 2021-09-10 成都创亿世通科技有限公司 Hand-held pressing equipment

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