CN104993845B - Frequency hopping pattern synchronous method for quick frequency hopping system - Google Patents
Frequency hopping pattern synchronous method for quick frequency hopping system Download PDFInfo
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- CN104993845B CN104993845B CN201510312853.3A CN201510312853A CN104993845B CN 104993845 B CN104993845 B CN 104993845B CN 201510312853 A CN201510312853 A CN 201510312853A CN 104993845 B CN104993845 B CN 104993845B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7156—Arrangements for sequence synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
- H04L27/2663—Coarse synchronisation, e.g. by correlation
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Abstract
For the frequency hopping pattern synchronous method of quick frequency hopping system, it is related to spread spectrum communication field.It is to solve in the case of high frequency hopping rate, it is difficult to the problem of quick and precisely realizing the synchronization of frequency hopping pattern.Starting stage, synchronizing frequency is first determined according to algorithm, initial synchronisation information is sent with synchronizing frequency；Initial synchronization stage, receiving terminal calculates synchronizing frequency, with specific Policy receipt synchronizing information, completes initial synchronisation；Duties synchronous phase, transmitting terminal sends duties jump, wherein comprising with initial synchronisation message structure identical duties information, receiving terminal receives duties information, the start/stop time of frequency hopping adjusted with algorithm, completes duties synchronous；Slow networking synchronous phase, receiver receives duties information to realize the synchronization of frequency hopping pattern by special scheme.The present invention is suitable for high-speed frequency hopping system.
Description
Technical field
The present invention relates to spread spectrum communication field.
Background technology
Frequency hopping communications is because have the advantages that common-path interference and confidentiality are applied in military communication earliest.In 20th century
The fifties, various countries just have begun to carry out theoretical research.Hop rate accelerates, and it is frequency-hopping communication system that message transmission rate, which is uprised,
Inevitable development trend, the rapid advances for having Digital Signal Processing (DSP) and microelectronics, and constantly propose it is various new
Frequency-hopping method, such as AFH, Chaotic Frequency Hopping, the ecology potential of frequency hopping communications must welcome a climax.
Development as the frequency-hopping synchronization of the key technology of frequency hopping is also very fast.Frequency-hopping synchronization is sufficiently complex, not only includes
It is synchronous that the carrier synchronization of legacy communications system, frame synchronization, bit synchronization further comprises frequency hopping pattern.Synchronous Major Difficulties are exactly
The synchronization of frequency hopping pattern, only on this basis, carries out solution jump, information is separated from carrier wave, baseband signal is obtained,
Bit synchronization and frame synchronization can be carried out, it is ensured that the correct demodulation decoding of data.Meanwhile, designer will consider frequency-hopping system work
When all difficulties that run into, such as when high jump sepeed works, Low SNR is synchronous at these when system clock error is very big
How to be completed in the case of severe.The simultaneous techniques of only frequency-hopping system is relatively reliable, when quick, the overall performance of frequency-hopping system
It could rise.Research now for frequency-hopping system is concentrated mainly in ultrahigh speed frequency hopping, and frequency-hopping synchronization is proposed accordingly
Higher requirement, synchronous success rate more and more higher, lock in time is shorter and shorter, and in order to meet these requirements, frequency-hopping synchronization also goes out
New method and thinking is showed.
Synchronously conventional method has four kinds to frequency hopping pattern, can be divided into independent channel method, self-synchronizing method, synchronous prefix method and
Reference clock method.Introduce separately below：
1) independent channel method transmits synchronizing information using a special channel, and synchronous side is realized with this synchronizing information
Method.
2) by some way, a common time base (such as satellite time transfer) is distributed in all radio station into net to reference clock method, according to
It is secondary to realize synchronously.
3) implicit synchronization information in the information sequence that self-synchronizing method transmitter is sent, Hopping frequencies, afterwards in receivers
Synch information extraction is come out, so as to realize synchronous method.
4) synchronous prefix method, which is sent before data message is sent, first in a synchronous prefix, the synchronous prefix, contains life
Into the full detail and local clock information needed for frequency hopping pattern, the information realization frequency hopping that receiver is provided according to synchronous prefix
It is synchronous.
In summary, the frequency hopping pattern synchronization scenario of quick frequency hopping system should have following feature：
1) synchronous reliability includes many indexs such as synchronous setup time, time to lose lock.Lock in time be refer to from
Synchronous set up starts to synchronous to set up the time used in completing, and is the important indicator for weighing net synchronization capability quality.During synchronous holding
Between refer to the synchronous to jump the duration kept to jump mode of receiving-transmitting sides.Time to lose lock has closely with clock stability
Relation.
2) synchronous anti-investigation is anti-investigation, need to synchronize the protection of covering of frequency, synchronizing frequency should exist as far as possible
Pseudorandomly change on whole Hopping frequencies table.The synchronizing signal skyborne time should simultaneously shortened, in multiple synchronizing bands
Synchronizing information is transmitted in rate, is mixed using the useless transmission of a large amount of non-synchronous frequencies and covers useful transmission, can also be by synchronization
Information is encrypted.
3) synchronous anti-interference includes the performance of anti-artificial disturbance and anti-noise jamming.Under severe interference environment, it is
It can guarantee that communication is normal, can take the error-control technique of synchronizing information in itself, plan is controlled using the synchronous algorithm assert
Ground step-out algorithm control strategy, can make synchronous probability as high as possible, (i.e. empty inspection is generally for False detection slightly and under synchronous regime
Rate) it is as small as possible.
4) synchronous anti-personation personation synchronizing information interference refers to that disturber uses the synchronizing frequency of communication party, to space
Launch all legal personation synchronizing informations such as speed, form and message structure, communication party is implemented to disturb.
Currently existing scheme and advantage and disadvantage：The importance of frequency-hopping synchronization is self-evident, so being also always the heat of frequency hopping research
Point, the advantage and disadvantage of above-mentioned four kinds of basic synchronization schemes are all apparent.Independent channel method needs special channel to transmit synchronous letter
Breath, some communication systems are difficult to provide special channel, therefore the application of independent channel method is restricted, in addition synchronizing information
Transmission mode is not hidden, it is easy to is found and is disturbed by enemy.Advantage is that synchronous setup time is short, can constantly transmit synchronous letter
Breath, keeps the long-time of system synchronous.The requirement of the precision, stability of base is high during reference clock method pair, and designs such
When base difficulty greatly, cost it is very high and meanwhile pair when base dependence it is too big, base just completely can not be synchronous when mustn't go to accurate.From
Synchronos method has the advantages that saving channel, saving signal power and synchronizing information are hidden.It is long the time required to having the disadvantage initial synchronisation,
It is only applicable to the frequency-hopping system of simple frequency hop sequences.Synchronous prefix method has the advantages that Fast synchronization, but synchronous prefix is subject to
Interference, must add synchronous protection measure, waste frequency resource and signal power.
The content of the invention
The present invention is in order to solve in the case of high frequency hopping rate, it is difficult to quick and precisely realize that the synchronous of frequency hopping pattern is asked
Topic, so as to provide a kind of frequency hopping pattern synchronous method for quick frequency hopping system.
For the frequency hopping pattern synchronous method of quick frequency hopping system, it is realized by following steps：
Step 1: receiver is started shooting, the frequency used in slow scanning communication judges whether first relevant peaks received
Just, if it is judged that being yes, then to perform step 2 one；If it is judged that being no, then step 2 two is performed；
Step 2 one, continue to scan on several cycles, and record the number of times of each frequency institute acquisition success, terminate scanning, hold
Row step 3；
Step 2 two, record capture relevant peaks number of times；And judge that capture number of times exceedes pre-determined threshold, if it is judged that being
It is then to perform step 3；If it is judged that being no, then step 221 is performed；
Step 221, return perform step 2 two；
Step 3: residing in the most frequency of acquisition success number of times, receiving preamble sequences determine synchronizing frequency sequence number,
The difference of clock information is calculated, and makes correct clock information into；
Step 4: the correct clock information obtained with step 3 calculates synchronizing frequency, until receiving terminal is captured again
After the resident frequency of success, step 5 is performed；
Step 5: since next synchronizing frequency with normal speed with jumping, receive complete initial synchronisation letter
Breath, calculates frequency hopping pattern, after sky jump terminates, starts normal frequency hopping communications, performs step 6；
Jumped Step 6: receiver receives duties, relevant peaks are calculated with the targeting sequencing in duties information, with the position of relevant peaks
Put the start/stop time of adjustment frequency hopping, it is ensured that the tracking of frequency-hopping synchronization.
The frequency of slow scanning described in step one is：N/mono-, N of normal frequency hopping rate is positive integer.
The method of calculating synchronizing frequency described in step 3 is：
Step A, the clock information of k and k row, each row of the random matrix of n row done and computing, obtain one
The matrix of new k rows, n row, performs step B；K and n are positive integer；
Step B, each row of statistics 1 number, if number is odd number, are designated as 1；If number is even number, 0 is designated as,
The binary number of one n is obtained, the decimal system is converted to, the frequency in Hopping frequencies table is selected with the binary number as same
Synchronizing frequency, performs step C；
Step C, with the new clock information of one minute slower than former clock step A and B are performed, until producing N-1 synchronizing band
Rate, performs step D；
Whether N-1 described in step D, checking procedure C synchronously meet wide interval, it is desirable between each two frequency number
Every more than m, m is real number；
If be unsatisfactory for, change random matrix, return and perform step A, if meeting, be used as the synchronizing frequency produced.
Initial synchronisation information in step 5 includes thick synchronizing sequence, frame synchronization sequence, clock information and empty jump；
Wherein：Slightly synchronizing sequence is：Targeting sequencing；Thick synchronizing sequence is the good m-sequence of autocorrelation, and different
The thick synchronizing sequence that synchronizing frequency is sent is different, and thick synchronizing sequence is corresponded with synchronizing frequency；
Receiving terminal judges synchronizing frequency sequence number by the thick synchronizing sequence received, so as to correct clock information.
Duties information in step 6 includes thick synchronizing sequence, frame synchronization sequence, clock information and empty jump；
Thick synchronizing sequence in duties information is the m-sequence opposite with the thick synchronizing sequence in initial synchronisation information.
Duties are jumped equably to be occurred in data message.
Self-synchronizing method, reference clock method, synchronous prefix method are combined by the present invention, are reached and be ensure that initial synchronization time
It is short, kept for lock in time long, and frequency resource and power resource are not wasted, while there is initial synchronisation information good resisting to do
Immunity can be with anti-personation performance.The present invention is realized in the case of high frequency hopping rate, quick and precisely realizes the same of frequency hopping pattern
Step.
Brief description of the drawings
Fig. 1 is the schematic flow sheet for the synchronizing frequency generating algorithm that the present invention is used；
Fig. 2 is the receiving terminal initial synchronous search strategy schematic diagram of the present invention；
Fig. 3 is that receiving terminal in the present invention networks synchronous search strategy schematic diagram late；
Embodiment
Embodiment one, with reference to Fig. 1 to Fig. 3 illustrate present embodiment, the frequency hopping for quick frequency hopping system
Pattern synchronous method, Step 1: receiver is started shooting, the frequency used in slow scanning communication, if first relevant peaks received
Just, to perform step 2 one, if it is not, performing step 2 two；
Step 2 one, continue to scan on several cycles, and record the number of times of each frequency institute acquisition success, terminate scanning, hold
Row step 3；
Step 2 two, record capture relevant peaks number of times, if number of times exceedes thresholding, perform step 3, if being no more than, perform step
Rapid 22；
Step 3: residing in the most frequency of acquisition success number of times, receiving preamble sequences determine synchronizing frequency sequence number,
Calculate difference and the correction of clock information；
Step 4: calculating synchronizing frequency with correct clock information, until receiving terminal, acquisition success is resident frequency again
After perform step 5；
Step 5: since next synchronizing frequency with normal speed with jumping, receive complete initial synchronisation letter
Breath, calculates frequency hopping pattern, after sky jump terminates, starts normal frequency hopping communications, performs step 6；
Jumped Step 6: receiver receives duties, relevant peaks are calculated with the targeting sequencing in duties information, with the position of relevant peaks
Put the start/stop time of adjustment frequency hopping, it is ensured that the tracking of frequency-hopping synchronization；
Slow scanning in step one, is to be carried out with the N of normal frequency hopping rate/mono-, because synchronizing frequency is in the present invention
N-1, the probability of capture can be increased by completely being scanned with the speed of N/mono-.
The composition of initial synchronisation information in step 5：
Synchronizing information is that the double hairs of transmitting-receiving realize synchronous key, and the most important part of synchronizing information is clock information.It is logical
Believing the real time clock information of both sides includes date Hour Minute Second, millisecond delicate nanosecond, is provided by high accuracy real-time clock.Initial synchronisation
Information is made up of thick synchronizing sequence (targeting sequencing), frame synchronization sequence, clock information, empty jump.Wherein thick synchronizing sequence is from phase
The good m-sequence of closing property, and the thick synchronizing sequence that different synchronizing frequencies is sent is different, thick synchronizing sequence and synchronizing frequency one
One correspondence.Receiving terminal can judge synchronizing frequency sequence number by the thick synchronizing sequence received, so as to correct clock information.
The composition of duties information in step 6.The composition of duties information is identical with initial synchronisation information, simply thick synchronous
Sequence is the m-sequence opposite with the thick synchronizing sequence in initial synchronisation information, therefore, and the relevant peaks that receiver is obtained are negative, are jumped
Display system has recognition capability to duties synchronizing information and initial synchronisation information.Meanwhile, it can also be used in this thick synchronizing sequence
Detect synchronous quality.Duties are jumped equably occur in data message as far as possible.
Synchronizing frequency generation method is：
Step 1: by the clock information of k and a k row, each row of the random matrix of n row are done and computing, obtain one
Individual new k rows, the matrix of n row, perform step 2；
Step 2: counting 1 number of each row, odd number is designated as 1, and even number is designated as 0, obtains one n and two enters
Number processed, is converted to the decimal system, and the frequency in Hopping frequencies table is selected with this number as synchronizing frequency, step 3 is performed；
Step 3: perform step one with the new clock information of one minute slower than former clock, and two, until producing N-1 synchronization
Frequency, performs step 4；
Step 4: examining whether N-1 synchronously meet wide interval, it is desirable to which the interval between each two frequency number is more than m, such as
Fruit is unsatisfactory for, then changes random matrix, performs step one, if meeting, produces available synchronizing frequency.
Claims (5)
1. for the frequency hopping pattern synchronous method of quick frequency hopping system, it is characterized in that：It is realized by following steps：
Step 1: receiver is started shooting, the frequency used in slow scanning communication judges whether that first relevant peaks received are
Just, if it is judged that being yes, then step 2 one is performed；If it is judged that being no, then step 2 two is performed；
Step 2 one, continue to scan on several cycles, and record the number of times of each frequency institute acquisition success, terminate scanning, perform step
Rapid three；
Step 2 two, record capture relevant peaks number of times；And judge capture number of times exceed pre-determined threshold, if it is judged that be it is yes,
Then perform step 3；If it is judged that being no, then step 221 is performed；
Step 221, return perform step 2 two；
Step 3: residing in the most frequency of acquisition success number of times, receiving preamble sequences, synchronizing frequency sequence number is determined, is calculated
The difference of clock information, and make correct clock information into；
Step 4: the correct clock information that is obtained with step 3 calculates synchronizing frequency, until receiving terminal acquisition success again
After resident frequency, step 5 is performed；
Step 5: since next synchronizing frequency with normal speed with jumping, receive complete initial synchronisation information, meter
Frequency hopping pattern is calculated, after sky jump terminates, starts normal frequency hopping communications, performs step 6；
Jumped Step 6: receiver receives duties, relevant peaks are calculated with the targeting sequencing in duties information, adjusted with the position of relevant peaks
The start/stop time of whole frequency hopping, it is ensured that the tracking of frequency-hopping synchronization；
Initial synchronisation information in step 5 includes thick synchronizing sequence, frame synchronization sequence, clock information and empty jump；
Wherein：Slightly synchronizing sequence is：Targeting sequencing；Thick synchronizing sequence is the good m-sequence of autocorrelation, and different synchronizations
The thick synchronizing sequence that frequency is sent is different, and thick synchronizing sequence is corresponded with synchronizing frequency；
Receiving terminal judges synchronizing frequency sequence number by the thick synchronizing sequence received, so as to correct clock information；
Thick synchronizing sequence is used for detecting synchronous quality.
2. the frequency hopping pattern synchronous method according to claim 1 for quick frequency hopping system, it is characterised in that step one
Described in the frequency of slow scanning be：N/mono-, N of normal frequency hopping rate is positive integer.
3. the frequency hopping pattern synchronous method according to claim 2 for quick frequency hopping system, it is characterised in that step 4
Described in the method for calculating synchronizing frequency be：
Step A, the clock information of k and k row, each row of the random matrix of n row done and computing, obtain one it is new
The matrix of k rows, n row, performs step B；K and n are positive integer；
Step B, each row of statistics 1 number, if number is odd number, are designated as 1；If number is even number, 0 is designated as, is obtained
The binary number of one n, is converted to the decimal system, and the frequency in Hopping frequencies table is selected with the binary number as synchronizing band
Rate, performs step C；
Step C, with the new clock information of one minute slower than former clock step A and B are performed, until producing N-1 synchronizing frequency, held
Row step D；
Whether N-1 described in step D, checking procedure C synchronously meet wide interval, it is desirable to which the interval between each two frequency number is big
In m, m is real number；
If be unsatisfactory for, change random matrix, return and perform step A, if meeting, be used as the synchronizing frequency produced.
4. the frequency hopping pattern synchronous method according to claim 1 for quick frequency hopping system, it is characterised in that step 6
In duties information include thick synchronizing sequence, frame synchronization sequence, clock information and empty jump；
Thick synchronizing sequence in duties information is the m-sequence opposite with the thick synchronizing sequence in initial synchronisation information.
5. the frequency hopping pattern synchronous method according to claim 4 for quick frequency hopping system, it is characterised in that duties are jumped
Equably occur in data message.
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| CN105897303B (en) * | 2016-03-23 | 2018-05-04 | 中国电子科技集团公司第十研究所 | Reduce the method and circuit of frequency-hopping communication system Frequency Hopping Signal synchronization time |
| CN108809356B (en) * | 2017-04-26 | 2020-11-20 | 北京化工大学 | Method for realizing frequency hopping networking based on TDMA technology |
| CN110445512A (en) * | 2019-09-06 | 2019-11-12 | 上海无线电设备研究所 | A kind of capture and synchronous method suitable for high-speed frequency hopping system |
| CN114665921A (en) * | 2020-12-23 | 2022-06-24 | 徐正平 | Method for realizing asynchronous hopping communication by using multiple electromagnetic wave frequencies |
| CN112737633B (en) * | 2020-12-25 | 2022-03-15 | 河北远东通信系统工程有限公司 | Frequency hopping group call delayed adding method suitable for PDT/DMR |
| CN114448466B (en) * | 2022-02-10 | 2022-11-01 | 重庆大学 | Frequency hopping synchronization method suitable for power Internet of things |
| CN114978236B (en) * | 2022-05-20 | 2024-05-14 | 湖南国科锐承电子科技有限公司 | TOD-based frequency hopping synchronization method |
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| CN101626268A (en) * | 2009-08-12 | 2010-01-13 | 广州海格通信集团股份有限公司 | Realizing method for synchronizing high-speed frequency hopping of narrowband |
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