CN105245248B - A kind of method that frequency hopping communications is realized under strong electromagnetic interference environment - Google Patents
A kind of method that frequency hopping communications is realized under strong electromagnetic interference environment Download PDFInfo
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Abstract
The present invention relates to a kind of method of frequency hopping communications, more particularly to a kind of method that frequency hopping communications is realized under strong electromagnetic interference environment, step is as follows：(1) foundation of frequency-hopping system mathematical modeling, by carrying out baseband modulation to input information code sequence, then causes debit synchronous with originating party, completes the reception and transmission of Frequency Hopping Signal by the control of frequency hop sequences controller；(2) foundation of frequency-hopping synchronization, allows frequency-hopping receiver and frequency hopping transmitter to use identical frequency identical at the time of, obtains correct IF-FRE；(3) determination of frequency hopping pattern, is designed by the frequency hopping pattern based on RS codes, coefficient is selected in galois field, then enter line translation；(4) networking of frequency hopping communications, and then extend the coverage progress networking in radio station.Advantages of the present invention effect：The bit error rate of system can be reduced so as to the overall performance of lifting system.Improve the antijamming capability of communication, particularly the confidentiality of communication and the reliability of transmission are improved under complicated circumstances of battlefield communications, and frequency hopping communications can receive multiple frequency-hopping systems in certain broadband content using different frequency hopping patterns and work simultaneously, so as to greatly improve system spectrum utilization rate.
Description
Technical field
Realize that frequency hopping is led under strong electromagnetic interference environment the present invention relates to a kind of method of frequency hopping communications, more particularly to one kind
The method of letter, the main antijamming capability for improving communication, improves the reliability of communications.
Background technology
Due to the development that China's economy is stablized continuously and healthily, urban construction and life is caused rapidly to increase the demand of electric power
Long, the transformer station of a large amount of voltage levels and power network have been built completion or built so that current electromagnetic environment
Become increasingly complex.How the focus of 21 century war quickly and accurately obtains information needed if will focus on, and how to deprive enemy
The useful information of side, Information Superiority has turned into the key factor for determining war face-off both sides' victory or defeat, and ensures efficiently, smoothly to believe
Breath transmission is comprehensive various operation key elements, the key link for playing fullfledged combat capability.Material is thus formed be different from traditional war
New key element --- the Complicated Electromagnetic Environment in Battlefield of field.Under such battlefield surroundings, informationization has developed into combined operation
For a kind of brand-new mode of operation.Combined operation under Information Condition, it is desirable to will be distributed over various on the space war battlefield of land, sea and air
Detection system, command and control system and attack weapon system (including offensive electronic warfare system) is scouted organically to combine one
Rise, form a unified, efficient combat system-of-systems, decision superiority and operation advantage are reached by capturing Information Superiority, it is real
Shared resources that existing situation of battlefield is perceived, the hight coordinate of operation can just be greatly enhanced fighting efficiency with cooperateing with.So
And, there is lance to have shield, during Information Superiority is fought for, due to the use of a large amount of electronic information equipments, their not only quantity
Huge, system is complicated, wide variety, and power is big so that the electromagnetic signal in the space of battlefield is very intensive, forms extremely
Complicated electromagnetic environment.
So-called complex electromagnetic environment, refers to multiclass produced under the fierce Resisting Condition of both sides at war on Information Battlefield
Type, entire spectrum, highdensity ELECTROMAGNETIC RADIATION SIGNATURE, and one's own side caused by electronic equipment largely using influencing each other and disturb,
So as on changeable, spatial domain of causing to happen suddenly in time domain on crisscross, frequency domain it is crowded overlapping, have a strong impact on effectiveness of weapon equipment,
Operational commanding and the invisible battlefield surroundings of troop operation action.
In order to improve the survival ability under complex electromagnetic environment, how research utilizes advanced Digital Signal Processing skill
Art, improve or enhancing existing communication system antijamming capability, be improved particularly those conventional Anti-Jamming Technique measures and can not resist
Jamming pattern obviously have its necessity, importance and urgency.
With developing rapidly for the communication technology, also it is continuously increased in business demand.Needed which results in communication service
Contradiction between the growth asked and limited frequency spectrum resource so that frequency spectrum resource is more and more nervous.For communication countermeasure angle,
The crowded of frequency band means the limited available bandwidth of each communication system, so necessarily causes the difficulty for resisting Communication Jamming
Increase.For spread spectrum communication, it also haves the shortcomings that as follows for the frequency band of raising signal to noise ratio institute broadening：Its
One, it, which can not make full use of, widens the anti-interference potentiality that frequency band is brought, actually precious in " waste " when signal to noise ratio is very low
Expensive frequency spectrum resource；Second, occupying after wide frequency band, the user that same minizone communicates simultaneously is not one but many
It is individual, in the environment of multipath fading, inevitably cause serious intersymbol interference.Realized in limited frequency spectrum resource anti-
Interference communication, is just utilized to frequency spectrum resource, and arrowband Anti-Jamming Technique proposes new higher requirement.Second needs what is solved
Problem is influence of the white Gaussian noise interference signal to channel than larger, and is not easy to remove in general.So-called height
This white noise interference signal, is exactly the amplitude distribution Gaussian distributed of interference signal, and its power spectral density is uniform
Distribution.Whole field is almost occupied because the frequency band of white Gaussian noise interference signal is very wide, its nothing overlapping with signal of communication
Method distinguishes useful signal and interference signal, and gratifying effect cannot be reached using above-mentioned frequency hopping and spread spectrum
Really.
The content of the invention
In order to solve the above-mentioned technical problem the present invention provides one kind and frequency hopping communications and group is realized under strong electromagnetic interference environment
The method of net, it is therefore an objective to which the reliability and validity for improving communication system adapt it to strong electromagnetic complex environment.
For up to a kind of method that frequency hopping communications is realized under strong electromagnetic interference environment of the above-mentioned purpose present invention, step is as follows：
(1) foundation of frequency-hopping system mathematical modeling, by carrying out baseband modulation to input information code sequence, then by jumping
The control of frequency sequence controller causes debit synchronous with originating party, completes the reception and transmission of Frequency Hopping Signal；
(2) foundation of frequency-hopping synchronization, allows frequency-hopping receiver and frequency hopping transmitter to use identical frequency identical at the time of,
Obtain correct IF-FRE；
(3) determination of frequency hopping pattern, is designed by the frequency hopping pattern based on RS codes, coefficient is selected in galois field, then
Enter line translation；
(4) networking of frequency hopping communications, and then extend the coverage progress networking in radio station.
In step (1), after transmitting terminal information data is changed by waveform, incoming carrier modulation, carrier wave is occurred by frequency hop sequences
Device control variable frequency synthesizer is produced, and frequency hop sequences value changes once, and carrier frequency changes once, and the code element of frequency hop sequences is wide
Tc, then at interval of time Tc, carrier frequency saltus step is once；The load that frequency synthesizer is produced so is controlled by FH Sequence Generator
Ripple carries out carrier modulation with information data, then removes low frequency signal by high-pass filter again, signal goes out from high-pass filter
Launch receiving end reception by radio-frequency filter progress again after coming, in receiving terminal, the signal received is first passed around
One broadband filter, in order to ensure that debit is synchronous with originating party signal, the local oscillation signal of receiver is also a frequency hopping
Signal, saltus step rule is controlled by the pseudo noise code of receiving terminal, and the pseudo noise code that receiving terminal is produced is identical with transmitting terminal, control
The rule of frequency change processed is identical, and the frequency that two frequency synthesizers are produced is corresponding, but corresponding frequency has a frequency difference
fi, just it is the intermediate frequency of receiver；As long as the pseudo noise code of receiving-transmitting sides is synchronous, so that it may produce the frequency synthesizer of receiving-transmitting sides
Raw jump frequency is synchronous, after a bandpass filter, so that it may obtain a changeless intermediate-freuqncy signal, then the intermediate frequency
Signal is demodulated by a data demodulator, it is possible to recover send information, so far complete Frequency Hopping Signal transmission with
Receive.
In step (2), during debit synchronizes, recipient one start be at slow scanning state, with less than
The speed of chirp rate carries out frequency hopping, to catch the synchronizing information in targeting sequencing, if synchronizing information is not captured after
It is continuous to carry out slow scanning and repeat above-mentioned steps, if capturing synchronizing information, further determine whether as targeting sequencing, if
It is that targeting sequencing is then proofreaded lock in time and carried out with jumping, otherwise enters and enter net state late, has proofreaded after lock in time then again
Secondary confirmation targeting sequencing, if targeting sequencing then carries out receiving network No. and temporal information, is returned if being not also targeting sequencing
To initial slow scanning state, synchronous foundation is finally completed.
In step (3), the design process to frequency hopping pattern is：(1) galois field generator polynomial coefficient, the power in domain are inputted
M, and c1, c0 value；Member in galois field have three kinds of method for expressing, for GF (23) on, the multinomial of generation is f (x)
=x3+ x+1 α=2=(010), for galois field α=2=(010), so by domain 23=8 elements are with three kinds of different sides
Method shows, and obtains αnAs αn-1Progress moves to left one, and when the left side highest order of vector is 1, then moving to left it
M-1 before vector afterwards, the coefficient module two of power corresponding with generator polynomial adds, and so obtains Jia Luohua coefficient；(2) calculate
The period p of sequence；(3) call subfunction, c1 value is converted into power by the decimal system represents, then again by c1 power represent with
Element multiplication in domain exports the power matirx cxm of multiplied result；(4) whether coefficient of determination c0 is 0, if 0 by matrix cxm
Power be converted into decimal number, finally exported, if coefficient not be 0, c0 and matrix cxm are converted into 2 yuan of m positions vector
C0-w, cxw, then by c0-w, cxw each component phase adduction is converted into the decimal system；(5) improvement of code generator polynomial, in order to solve
The problem of Hamming cross-correlation secondary lobe increases sharply between asynchronous networking, any two sequence, is improved to generator polynomial below, by sequence
Arrange { pjEach code bit element plus fixed amount { α2j, obtainMultinomial；
If another sequence { qjMultinomial pass through Q (αsX)=(αsx)2+C0+C1αsThis multinomial of x is produced, then P (x) and Q
(x) difference is expressed as P (x)-Q (αsX)=(1- α2s)x2+C1(1-αs) x, because αsIn s can arbitrarily choose, so two sequences
Maximum consistent beginning code position between code bit number and two sequences is unrelated between row, can be used for asynchronous frequency hopping communications networks.
In step (4), there are 8 working conditions in frequency hopping communications radio station, including scanning mode, call setting state, sends and exhale
Cry state, frequency fixing communication state, late networking application status, receive slow networking application information state, send slow networking boot state
With frequency hopping communications state, including：
A) status scan：Before networking, all frequency hopping radio sets determine to jump all in scanning mode by status scan in net
Frequency radio station state in which；
B) calling procedure：Frequency hopping communications can be divided into three steps during networking, be that frequency hopping net is exhaled first, be exactly
The radio station in one net of calling is realized by setting all radio station in calling Home Network or other nets in one radio station；Next to that
Frequency hopping selective call, a certain portion radio station is by setting another radio station in the call object in Home Network, calling Home Network；It is finally to determine frequency
Calling, frequency hopping radio set is operated in frequency fixing communication state by setting fixed working frequency, on the selected channel with determining frequency electricity
Platform is communicated；
C) network process is entered late：When in net other radio station oneself be in frequency hopping communications state when, one or multi-section radio station due to
Certain reason fails to network, it is necessary to take certain measure to enter frequency hopping communications networks working condition, and at this moment radio station will enter to enter late
Net application status, subsequently into slow networking application status are received, slow networking boot state is sent once receiving application and will enter,
Finally enter frequency hopping communications state.
Advantages of the present invention effect：The bit error rate of system can be reduced so as to the overall performance of lifting system.Improve communication
Antijamming capability, particularly improve the confidentiality of communication and the reliability of transmission under complicated circumstances of battlefield communications, and
And frequency hopping communications can receive multiple frequency-hopping systems in certain broadband content using different frequency hopping patterns and work simultaneously, so that greatly
It is big to improve system spectrum utilization rate.
Brief description of the drawings
Fig. 1 is frequency hopping communications radio mode transfer figure in the present invention.
Fig. 2 is frequency-hopping communication system block diagram in the present invention.
Fig. 3 is the generation flow chart of frequency hopping pattern in the present invention.
Fig. 4 is the synchronous flow chart of debit in the present invention.
Fig. 5 is hopped-frequency pulses procedural block diagram of the invention.
Embodiment
In order that the purpose of the present invention, technical scheme and beneficial effect are more clearly understood, below in conjunction with accompanying drawing, to this hair
It is bright to be described in further detail.
A kind of method that frequency hopping communications is realized under strong electromagnetic interference environment, step is as follows：
(1) foundation of frequency-hopping system mathematical modeling, by carrying out baseband modulation to input information code sequence, then by jumping
The control of frequency sequence controller causes debit synchronous with originating party, completes the reception and transmission of Frequency Hopping Signal；
(2) foundation of frequency-hopping synchronization, allows frequency-hopping receiver and frequency hopping transmitter to use identical frequency identical at the time of,
Obtain correct IF-FRE；
(3) determination of frequency hopping pattern, is designed by the frequency hopping pattern based on RS codes, coefficient is selected in galois field, then
Enter line translation；
(4) networking of frequency hopping communications, and then extend the coverage progress networking in radio station.
In step (1), after transmitting terminal information data is changed by waveform, incoming carrier modulation, carrier wave is occurred by frequency hop sequences
Device control variable frequency synthesizer is produced, and frequency hop sequences value changes once, and carrier frequency changes once, and the code element of frequency hop sequences is wide
Tc, then at interval of time Tc, carrier frequency saltus step is once；The load that frequency synthesizer is produced so is controlled by FH Sequence Generator
Ripple carries out carrier modulation with information data, then removes low frequency signal by high-pass filter again, signal goes out from high-pass filter
Launch receiving end reception by radio-frequency filter progress again after coming, in receiving terminal, the signal received is first passed around
One broadband filter, in order to ensure that debit is synchronous with originating party signal, the local oscillation signal of receiver is also a frequency hopping
Signal, saltus step rule is controlled by the pseudo noise code of receiving terminal, and the pseudo noise code that receiving terminal is produced is identical with transmitting terminal, control
The rule of frequency change processed is identical, and the frequency that two frequency synthesizers are produced is corresponding, but corresponding frequency has a frequency difference
fi, just it is the intermediate frequency of receiver；As long as the pseudo noise code of receiving-transmitting sides is synchronous, so that it may produce the frequency synthesizer of receiving-transmitting sides
Raw jump frequency is synchronous, after a bandpass filter, so that it may obtain a changeless intermediate-freuqncy signal, then the intermediate frequency
Signal is demodulated by a data demodulator, it is possible to recover send information, so far complete Frequency Hopping Signal transmission with
Receive.
In step (2), during debit synchronizes, recipient one start be at slow scanning state, with less than
The speed of chirp rate carries out frequency hopping, to catch the synchronizing information in targeting sequencing, if synchronizing information is not captured after
It is continuous to carry out slow scanning and repeat above-mentioned steps, if capturing synchronizing information, further determine whether as targeting sequencing, if
It is that targeting sequencing is then proofreaded lock in time and carried out with jumping, otherwise enters and enter net state late, has proofreaded after lock in time then again
Secondary confirmation targeting sequencing, if targeting sequencing then carries out receiving network No. and temporal information, is returned if being not also targeting sequencing
To initial slow scanning state, synchronous foundation is finally completed.
In step (3), the design process to frequency hopping pattern is：(1) galois field generator polynomial coefficient, the power in domain are inputted
Secondary m, and c1, c0 value；Member in galois field have three kinds of method for expressing, for GF (23) on, the multinomial of generation is f
(x)=x3+ x+1 α=2=(010), for galois field α=2=(010), so by domain 23=8 elements are with three kinds of differences
Method show, and obtain αnAs αn-1Progress moves to left one, and when the left side highest order of vector is 1, then
M-1 before vector after moving to left, the coefficient module two of power corresponding with generator polynomial adds, and so obtains Jia Luohua coefficient；
(2) period p of the sequence of calculation；(3) subfunction is called, c1 value is converted into power by the decimal system represents, then again by c1 power
Secondary expression exports the power matirx cxm of multiplied result with the element multiplication in domain；(4) whether coefficient of determination c0 is 0, will if 0
Power in matrix cxm is converted into decimal number, is finally exported, if coefficient is not 0, c0 and matrix cxm are converted into m
2 yuan of vector Cs 0-w, cxw, then by c0-w, cxw each component phase adduction is converted into the decimal system；(5) improvement of code generator polynomial, be
The problem of Hamming cross-correlation secondary lobe increases sharply between the asynchronous networking of solution, any two sequence, changes to generator polynomial below
Enter, by sequence { pjEach code bit element plus fixed amount { α2j, obtain
Multinomial；If another sequence { qjMultinomial pass through Q (αsX)=(αsx)2+C0+C1αsThis multinomial of x is produced, then P
(x) difference with Q (x) is expressed as P (x)-Q (αsX)=(1- α2s)x2+C1(1-αs) x, because αsIn s can arbitrarily choose, institute
It is unrelated with maximum consistent beginning code position between code bit number and two sequences between two sequences, it can be used for asynchronous frequency hopping communications networks.
In step (4), there are 8 working conditions in frequency hopping communications radio station, including scanning mode, call setting state, sends and exhale
Cry state, frequency fixing communication state, late networking application status, receive slow networking application information state, send slow networking boot state
With frequency hopping communications state, including：
In scanning mode, if certain radio station not yet networks, application networks late, hence into slow networking application status, enters late
After net application, scanning mode is automatically returned to.In scanning mode, receive the net of Home Network is exhaled or to the selective call of this TV station after, automatically
Into frequency hopping communications state.In scanning mode, other radio station are called, if oneself completes to set, are directly called hence into hair
If sending call state not complete setting, into call setting state, after being provided with, then scanning mode is returned to, if exhaled
Make other radio station then enter and send call state.Send after calling, into frequency hopping communications state, communicated with being exhaled radio station.
In frequency hopping communications state, if receiving applying late as netted for other radio station, sent late while continuing to keep frequency hopping communications
Networking guidance information.If receive determine frequency radio station determine frequency calling, operator can then determine carry out frequency fixing communication, keep frequency hopping
While synchronous, it is transferred to and determines frequency channel and communicated with determining frequency radio station, after the completion of communication, return to frequency hopping communications state.Frequency hopping is led to
After letter is completed or among frequency hopping communications process, application enters scanning, then returns to scanning mode.In order that radio station only exists in net
Each radio station need to set calling parameter before networking in search sweep in Home Network, net.So, radio station is only listened to Home Network in netting
Or this TV station calling when just enter frequency hopping communications state, that is to say, that category platform is only synchronous with calling main of Home Network network No..Networking
Before, all frequency hopping radio sets are in scanning mode in net, and when Dang Zhutai presses transmit-receive switch, main sends synchronous letter first
Number, the synchronizing signal is by after other category platforms are properly received in net, the first automatic correction this TV station clock of each category platform, then by the frequency hopping of oneself
Speed is traced on the frequency hopping rate of main automatically, then sets up frequency hopping communications.Communication is finished, and all radio station are turned again in net
Scanning mode, is communicated next time with waiting.
The calling of frequency hopping radio set is divided into that following three kinds of modes frequency hopping net is exhaled, frequency hopping selective call, fixed frequency are called.
(1), frequency hopping net is exhaled：Frequency hopping net exhales all radio station referred in a calling-up Home Network or other nets, realizes
Frequency hopping communications.It is every that there is with the radio station identical Hopping frequencies table, cipher key number, network No. when certain frequency hopping radio set, which carries out net, exhales
All radio station in other radio station, i.e. same subnet, can all respond net and exhale signal.
(2), frequency hopping selective call：Frequency hopping selective call refers to another radio station in a certain portion's calling-up Home Network, realizes frequency hopping communications.
One radio station selective call is in another radio station in same subnet, as long as directly choosing by page station number and sending calling.One
Portion radio station can not the radio station of selective call two not on the same stage number simultaneously.
(3), fixed frequency is called：Frequency hopping radio set can be operated in frequency fixing communication state, on the selected channel with determining frequency radio station
Communicated.Determine frequency radio station and send calling to frequency hopping radio set with the frequency calling frequency of determining of agreement, fixed frequency is called frequency hopping radio set herein
Frequency is opened a window, and operator's pressing " exhaling surely " key, which is transferred to, to be determined frequency channel and communicated with determining frequency radio station, is communicated after finishing, is pressed again
" exhaling surely " key returns to former frequency hopping net.
Network late refer to when in net other radio station oneself be in frequency hopping communications state when, one or multi-section radio station are due to certain
Reason fails to network, it is necessary to take certain measure to enter a kind of network access mode that frequency hopping communications networks work.Network and be broadly divided into late
Three kinds of network access modes actively apply for that networking late, passive traction network late and duties synchronously network late.
(1) actively apply networking late：Actively apply networking late and refer to the radio station for being introduced into work in frequency hopping communications networks actively
Networking application is sent, then radio station sends the network access mode for entering net guided signal late in net.What actively application networked late is worked
Journey is divided into four-stage and sends slow networking application information stage, receive the slow networking application information stage, send and enter net guided letter late
State phase is set up in breath stage, late networking.
(2) passive traction networks late：Passive traction networks late refers to that net interior radio station is found after networking by roll-call mode
There is the radio station that do not network, by the function that networks late, guide the radio station that do not network to enter a kind of slow network access mode of communication network.The course of work
Radio station in scanning mode, net is in for the radio station that do not network under frequency hopping communications state, to directly transmit and enter net guided signal late, do not enter
Net radio station is drawn into frequency hopping communications networks.
(3) duties are synchronous networks late：Synchronous network late of duties refers to that radio station is again in the radio station neither actively application that do not network, net
Name no names, but the duties synchronizing information inserted by receiving in frequcny modulation data stream realizes a kind of slow network access mode networked late.
The course of work is that radio station is during normal frequency hopping communications in all nets, per at regular intervals, in predetermined duties frequency
Upper transmission duties synchronizing information, it is synchronous that the duties inserted in frequency-hopped data stream are searched in the radio station that do not network in predetermined duties frequency
Information.The radio station that do not network is received after all required synchronizing informations, is adjusted real-time clock, is achieved that slow networking.
Under forceful electric power magnetic environment, more complicated interference can be produced in communication system, common Anti-Jamming Technique has spread spectrum
The hybrid technology that technology, intelligent antenna technology and multiple technologies are combined.Frequency hopping is one of the most frequently used spread spectrum mode, its work
Refer to that the carrier frequency of receiving-transmitting sides transmission signal carries out the communication mode of Discrete Change according to predetermined rule as principle, that is,
Succeed in reaching an agreement the carrier frequency that is used in letter by pseudorandom change code control and random jump.From time domain, Frequency Hopping Signal is
The frequency shift keyed signals of one multi-frequency；From frequency domain, the frequency spectrum of Frequency Hopping Signal be one in very broadband with
It is spaced random jump.Compared with directly-enlarging system, the pseudo-random sequence in frequency-hopping system is not transmitted directly, but for selecting
Select channel.
During the modelling of frequency hopping communications, we introduce following mathematical modeling, in the transmitting terminal of system, to input
Information code sequence carries out baseband modulation and obtains modulated signal m (t), and its frequency bandwidth is Bm.FH Sequence Generator is independently produced
Pseudo-random code sequence as frequency hop sequences go control frequency synthesizer, make its output frequency by different frequency hopping patterns or instruction
The change of random skip.Modulated signal m (t) is modulated to random carrier, obtains Frequency Hopping Signal Si(t), the signal is similar to
Carrier (boc) modulated signals, can be expressed as with mathematical formulae：In the formula, ω0+
nω△WithFor in nTc≤t<(n+1)TcThe frequency and first phase of time interval transmission signal, ω△For Hopping frequencies interval.Frequency hopping
System is S (t) by different conversion, final output signal, is formulated as：S (t)=Si(t)+J(t)+n(t).Connecing
Receiving end, in order to be demodulated to input signal, it is desirable to have control is gone in the frequency hopping instruction with the local pseudo-code generator generation of originator identical
Local frequency synthesizer, makes the local oscillation signal frequency that it is exported with the corresponding saltus step of originating party frequency, the local oscillation signal of saltus step is docked
The Frequency Hopping Signal received carries out frequency conversion, then by low pass filter, realizes that solution is jumped, obtain modulated signal m (t).It is low-pass filtered
After device, it can obtain
The synchronous design of frequency-hopping system, frequency-hopping synchronization refers to that frequency-hopping receiver and frequency hopping transmitter are used identical at the time of
Identical frequency.So receiving the frequency and the frequency of local frequency synthesizer generation of signal can just obtain just after mixing
True IF-FRE, then therefrom demodulates information signal, otherwise can not correctly demodulate information signal.Digital frequency-hop system is
Refer to transmission digital voice or the frequency-hopping communication system of data.Therefore, it, which transmits hopping synchronization information, is entered with the form of data frame
Capable.Digital display circuit frequency hopping synchronization method is nothing more than synchronous prefix method, self-synchronizing method and reference clock method.Synchronous prefix method.Hair
End need to send the code word containing synchronizing information, after receiving terminal decoding, make the local frequency hopper of receiving end same with originator according to synchronizing information
Step.Synchronizing information should mainly include the real time status information or real-time clock letter of frequency hopping pattern in addition to bit synchronization, frame synchronization
Breath, i.e., so-called " TOD " information (Time of the Day).Real time clock information include date Hour Minute Second, millisecond, microsecond,
Nanosecond etc.；Status information refers to the real-time code sequence state of pseudo-code generator.According to these information, receiving end it is known that working as
What frequency the frequency and next hop duration of preceding frequency hopping residence time should be in, so that sending and receiving end frequency hopper is synchronous
Work.In order to ensure being properly received for TOD information, bit synchronization and frame are housed in synchronizing information data frame format as depicted
Sync bit.In addition, can use error-control technique to TOD information bits, such as Error Correction of Coding or uses majority decision at correlative coding,
To improve the reliability of transmission.
The design of frequency hopping pattern, so-called frequency hopping is exactly the rule of carrier wave saltus step.When Frequency Hopping Communication Networks mode is identical, design
One good frequency hopping pattern can greatly reduce frequency hopping code collision.The design major design of Families of Frequency-Hopping Sequences is to 5 parameters；Frequently
Rate number q, sequence length L, sequence number N, Hamming correlation H and frequency interval d.These parameters are mutually constrained, by this
The analysis of a little parameters, can be designed that comparatively ideal Families of Frequency-Hopping Sequences.If each frequency most has more in a sequence period
Now once, then the sequence is referred to as non repetitive sequence.The design of frequency hopping pattern is actually the select permeability of pseudo-code pattern.To be terrible
To good frequency hopping pattern, there is following requirement to pseudo noise code：1st, under different translations, the coincidence number between each code is small, frequency hopping week
Average coincidence number is small in phase, and this requires the cross correlation of code to get well；2nd, each code sequence and the coincidence number of oneself translation
Small, this requires the autocorrelation performance of code to get well；3rd, available code sequence quantity is more, and this quantity first has to meet
Using the requirement of the frequency hopping communications number of users of same frequency range, and it is desirable that its quantity is the more the better, to meet wanting for confidentiality
Ask.The species of frequency hopping pattern generally refers to pseudo noise code and control method as frequency hopping pattern control code, at present, with it is more
Pseudo noise code be mainly m-sequence, M sequence and R-S code sequence.M-sequence is the conventional control code of frequency hopping pattern, and it is easily produced
It is raw, but from the viewpoint of the secrecy, this frequency hopping pattern with there is weak point in a communications system, because when using computer simulation
When, its regularity can be found quickly, and the size of key of m-sequence is not big enough.M sequence bar number is more much more than m-sequence, is non-linear
Shift-register sequence, can produce many frequency hopping patterns, and confidentiality is also strong.R-S code is a kind of optimal nearly orthogonal code,
Number of users is more, easily realizes, is a kind of preferable frequency hopping control code.
Claims (4)
1. a kind of method that frequency hopping communications is realized under strong electromagnetic interference environment, it is characterised in that step is as follows：
(1) foundation of frequency-hopping system mathematical modeling, by carrying out baseband modulation to input information code sequence, then passes through frequency hopping sequence
The control of row controller causes debit synchronous with originating party, completes the reception and transmission of Frequency Hopping Signal；
(2) foundation of frequency-hopping synchronization, allows frequency-hopping receiver and frequency hopping transmitter to use identical frequency identical at the time of, obtains
Correct IF-FRE；
(3) determination of frequency hopping pattern, is designed by the frequency hopping pattern based on RS codes, coefficient is selected in galois field, then carry out
Conversion, GF () is galois field；
Design process to frequency hopping pattern is：(1) inputs galois field generator polynomial coefficient, the power m in domain, and c1, c0
Value；Member in galois field have three kinds of method for expressing, for GF (23), therefore m numerical value be 3, i.e. domain in generate element
Binary representation digit be 3；C0 is constant order coefficient, and c1 is x coefficient, if need to ensure to generate the four fundamental rules fortune between element in domain
Result is calculated still inside domain, then must carry out modular arithmetic by mould of primitive polynomial, thus its multinomial generated be f (x)=
x3+ x+1, α=2=(010), α values are 2, are that the coefficient of generation element in the root of primitive polynomial, i.e. domain only has 0,1 two kinds of tables
Show, for galois field α=2=(010), so by domain 23=8 elements are showed with three kinds of different methods, and ten enter
System 2 is represented in binary as 010, in order to obtain Jia Luohua coefficients, αmNeed to power corresponding with generator polynomial coefficient module two plus,
But αm-1Binary representation position it is not corresponding with the coefficient positions of generator polynomial, therefore by αmBinary shift left one, now
Obtained αm-1The coefficient of power corresponding with generator polynomial is corresponding, and when the left side highest order of vector is 1, then moving to left
M-1 before vector afterwards, the coefficient module two of power corresponding with generator polynomial adds, and so obtains Jia Luohua coefficient；(2).
The period p of the sequence of calculation；(3) calls subfunction, and c1 value is converted into power by the decimal system represents, then again by c1 power
Represent the power matirx cxm with the element multiplication output multiplied result in domain；(4) whether coefficient of determination c0 is 0, if 0 by square
Power in battle array cxm is converted into decimal number, is finally exported, if coefficient is not 0, c0 and matrix cxm are converted into m positions 2
First vector C 0-w, cxw, then by c0-w, cxw each component phase adduction is converted into the decimal system；(5) improvement of codes generator polynomial, be
The problem of Hamming cross-correlation secondary lobe increases sharply between the asynchronous networking of solution, any two sequence, changes to generator polynomial below
Enter, by sequence { pjEach code bit element plus fixed amount { α2jObtain
Multinomial, wherein b represent information bit, and 2, C are taken in actual frequency hop sequences coding0And C1For generation multinomial coefficient；If another
Individual sequence { qjMultinomial pass through Q (αsX)=(αsx)2+C0+C1αsThis multinomial of x is produced, then P (x) and Q (x) difference table
It is shown as P (x)-Q (αsX)=(1- αsx)2+C1(1-αs) x, it is 2 rank multinomials, there is 2 roots, i.e. sequence { pjAnd sequence { qj}
Between, consistent code bit number is preferably at most 2, because αsIn s can arbitrarily choose, so between two sequences maximum consistent code bit number with
Beginning code position between two sequences is unrelated, can be used for asynchronous frequency hopping communications networks；
(4) networking of frequency hopping communications, and then extend the coverage progress networking in radio station.
2. a kind of method that frequency hopping communications is realized under strong electromagnetic interference environment according to claim 1, it is characterised in that
In step (1), after transmitting terminal information data is changed by waveform, incoming carrier modulation, carrier wave can by FH Sequence Generator control
Frequency synthesizer is produced, and frequency hop sequences value changes once, and carrier frequency changes once, the wide T of code element of frequency hop sequencesc, then often
Interval time Tc, carrier frequency saltus step is once；The carrier wave and letter that frequency synthesizer is produced so are controlled by FH Sequence Generator
Cease data and carry out carrier modulation, then remove low frequency signal by high-pass filter again, signal is after high-pass filter comes out
Carry out launching receiving end reception by radio-frequency filter again, in receiving terminal, the signal received first passes around one wide
Band filter, in order to ensure that debit is synchronous with originating party signal, the local oscillation signal of receiver is also a frequency hopped signals, is jumped
Become rule to be controlled by the pseudo noise code of receiving terminal, and the pseudo noise code that receiving terminal is produced is identical with transmitting terminal, controls frequency
The rule of change is identical, and the frequency that two frequency synthesizers are produced is corresponding, but corresponding frequency has a frequency difference fi, just
For the intermediate frequency of receiver；As long as the pseudo noise code of receiving-transmitting sides is synchronous, so that it may the jump for producing the frequency synthesizer of receiving-transmitting sides
Frequency is synchronous, after a bandpass filter, so that it may obtain a changeless intermediate-freuqncy signal, and then the intermediate-freuqncy signal is passed through
Cross a data demodulator to be demodulated, it is possible to recover the information sent, so far complete the transmission and reception of Frequency Hopping Signal.
3. a kind of method that frequency hopping communications is realized under strong electromagnetic interference environment according to claim 1, it is characterised in that
In step (2), during debit synchronizes, the start of recipient one is at slow scanning state, with less than chirp rate
Speed carry out frequency hopping, to catch the synchronizing information in targeting sequencing, proceed if synchronizing information is not captured slow
Scanning repeats above-mentioned steps, if capturing synchronizing information, further determines whether as targeting sequencing, if leading sequence
Row then check and correction lock in time and are carried out with jumping, and are otherwise entered and are entered net state late, have proofreaded before then reaffirming after lock in time
Sequence is led, if targeting sequencing then carries out receiving network No. and temporal information, is returned to if being not also targeting sequencing initial
Slow scanning state, finally completes synchronous foundation.
4. a kind of method that frequency hopping communications is realized under strong electromagnetic interference environment according to claim 1, it is characterised in that
In step (4), there are 8 working conditions in frequency hopping communications radio station, including scanning mode, call setting state, send call state, it is fixed
Frequency communications status, late networking application status, receive slow networking application information state, send slow networking boot state and frequency hopping communications
State, including：
A) status scan：Before networking, all frequency hopping radio sets determine frequency hopping electricity all in scanning mode by status scan in net
Platform state in which；
B) calling procedure：Frequency hopping communications can be divided into three steps during networking, be that frequency hopping net is exhaled first, be exactly one
The radio station in one net of calling is realized by setting all radio station in calling Home Network or other nets in radio station；Next to that frequency hopping
Selective call, a certain portion radio station is by setting another radio station in the call object in Home Network, calling Home Network；It is finally to determine frequency to exhale
Cry, frequency hopping radio set is operated in frequency fixing communication state, on the selected channel with determining frequency radio station by setting fixed working frequency
Communicated；
C) network process is entered late：When in net other radio station oneself be in frequency hopping communications state when, one or multi-section radio station are due to certain
Reason fails to network, it is necessary to take certain measure to enter frequency hopping communications networks working condition, and at this moment radio station will enter slow networking Shen
Please state, subsequently into receiving slow networking application status, send slow networking boot state once receiving application and will enter, finally
Into frequency hopping communications state.
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| US10491265B2 (en) | 2016-04-26 | 2019-11-26 | Texas Instruments Incorporated | Sleepy device operation in asynchronous channel hopping networks |
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| CN108600695A (en) * | 2018-04-19 | 2018-09-28 | 广东水利电力职业技术学院（广东省水利电力技工学校） | A kind of intelligent interaction robot control system |
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| CN114448466B (en) * | 2022-02-10 | 2022-11-01 | 重庆大学 | Frequency hopping synchronization method suitable for power Internet of things |
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| CN116366233B (en) * | 2023-05-30 | 2023-10-24 | 天津七一二通信广播股份有限公司 | Secure multicast-oriented data link communication system transmission encryption method and system |
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