CN101626268A - Realizing method for synchronizing high-speed frequency hopping of narrowband - Google Patents
Realizing method for synchronizing high-speed frequency hopping of narrowband Download PDFInfo
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- CN101626268A CN101626268A CN200910041818A CN200910041818A CN101626268A CN 101626268 A CN101626268 A CN 101626268A CN 200910041818 A CN200910041818 A CN 200910041818A CN 200910041818 A CN200910041818 A CN 200910041818A CN 101626268 A CN101626268 A CN 101626268A
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Abstract
The invention relates to a method for synchronizing the high-speed frequency hopping of narrowband, comprising the following steps: generating n frequencies, wherein some parts of the frequencies are variable frequencies generated according to time information and the remaining parts of the frequencies are fixed frequencies generated according to a series of fixed data; a sender circularly sends correlative sequence to a receiver with the n frequencies, wherein circularity is n+1; the receiver synchronously slowly researches, and if the frequency hopping is synchronous, quits the slow research; after completely sending the correlative sequence, the sender sends the scaled hopping of n hopping to the receiver; when the receiver receives the scaled hopping of the n hopping, the sender channel codes time information and service information into interleaved frame, and sends the interleaved frame to the receiver; and after receiving the interleaved frame, the receiver de-interleaves and channel decodes the interleaved frame to restore the time information and the service information. The method can realize the synchronization of fast and reliable frequency hopping of the narrowband in the process of high-speed frequency hopping communication, has no requirement of time difference between the receiver and the sender, and breaks away from requirement to the time information in the traditional frequency hopping communication.
Description
Technical field
The invention belongs to wireless anti-interference digital communicating field, particularly the synchronous implementation method of frequency hopping between the sending and receiving letter machine in the narrow-band high-speed frequency-hopping communication system under the electronic countermeasures condition.
Background technology
Frequency hopping communications is a kind of spread spectrum communication, the carrier frequency that transmission signals adopted between the sending and receiving letter machine is carried out Discrete Change according to predetermined rule, want to intercept and capture wherein Content of Communication and then must know the saltus step rule of carrier frequency, thereby have anti-interference, the anti-ability of intercepting and capturing, and can accomplish sharing frequency spectrum resource.Because frequency hopping itself is exactly a kind of spread spectrum communication, frequency hopping all is used in the narrow band communication usually.
Less than in 300 frequency hoppings at a slow speed or wide interval frequency hopping communication system of jumping, the symbolic number that contains in every jumping is many for hop rate, can comprise the synchronizing information of frequency hopping synchronizing sequence and sender in one jumps.After only needs one secondary frequencies is run between the sending and receiving letter machine, promptly can finish the frequency hopping synchronizing process.And in the arrowband frequency-hopping communication system, disturb in order to resist to follow the tracks of, hop rate must be brought up to more than 1000 jumpings.Therefore contain very limited symbol in the every jumping of narrow-band high-speed frequency hopping system, the synchronizing information (being commonly referred to temporal information) of frequency hopping synchronizing sequence (hereinafter referred to as correlated series) and sender must be divided into different jumpings and transmit; Just need repeatedly frequency to run into like this between sender and the receiver.Common sender begins once to communicate by letter with receiver and carries out the random frequency saltus step with the temporal information of oneself separately before; Thereby before sending and receiving letter machine begins communication, need to realize that transceiver carries out frequency hopping simultaneously and finishes a frequency hopping (promptly jumping alignment) simultaneously, and the frequency of each saltus step all the same (being Frequency Synchronization), this is the frequency hopping synchronizing process that will set up of frequency-hopping communication system just.
If the temporal information between the sending and receiving letter machine is in full accord, sending and receiving letters machine can jump on the same frequency that elapsed time information converts out in the synchronization carrier frequency.But need between the sending and receiving letter machine to jump alignment, be accurate to a sampling point cycle (sample rate is generally hundreds of kHz); Need the frequency unanimity, be accurate to a hop cycle (frequency-hopping system of 1000 jumping/seconds, hop cycle are 1ms).If the time ratio of sending and receiving letter machine is more approaching, the frequency of the synchronous usefulness of frequency hopping can be that parameter is calculated with both sides' time, realizes than being easier to synchronously.Just the someone proposes a kind of based on the more approaching synchronous implementation of frequency hopping of this sending and receiving letter machine time ratio now: not only comprise targeting sequencing but also comprise hopping synchronization information in the frequency hopping synchronization frame of sender, after receiver adopts search slowly to carry out the frequency hopping intercepting and capturing, detect the FH Synchronous Signals that contains synchronizing information again, it is synchronous to set up correct frequency hopping according to synchronizing information at last; It is synchronous that this method also can obtain the frequency hopping of high reliability, but can only be applied in more approaching frequency hopping at a slow speed or the wide interval frequency hopping communication system of sending and receiving letter machine time ratio; Because in the narrow-band high-speed frequency-hopping communication system, the time difference is a completely random between the sending and receiving letter, especially be difficult under electronic countermeasures and abominable natural conditions guarantee that two the sending out of sending and receiving letter machine obtains more accurate temporal informations, therefore the synchronous implementation of existing frequency hopping recited above can not solve the frequency hopping stationary problem in the narrow-band high-speed frequency-hopping communication system.
Summary of the invention
In order to solve existing technical problem in the prior art, purpose of the present invention just is to provide a kind of narrow-band high-speed frequency hopping synchronous implementation method, this method is under narrow-band high-speed frequency hopping communications condition, both there be not central station not have under the situation of satellite time service yet, realize that quick, reliable frequency hopping is synchronous in the narrow-band high-speed frequency hopping communications process, and this frequency hopping synchronized algorithm is to no time difference requirement between the sending and receiving letter machine, broken away from traditional frequency hopping communications the requirement to temporal information.
The objective of the invention is to be achieved through the following technical solutions: the synchronous implementation method of a kind of narrow-band high-speed frequency hopping may further comprise the steps:
Step (1), produce n frequency hopping synchronizing frequency, component frequency is the variable frequency according to the time information generating of sender in n frequency, and the remainder frequency is the fixed frequency according to a string fixing data generation;
Step (2), sender adopt n frequency to send correlated series to the receiver circulation, send n+1 circulation altogether; Receiver adopts n the frequency identical with sender to search for slowly synchronously, and each search cycle is (n+1) t, searches for n time; If the frequency when receiver is synchronous is fi, then receiver withdraws from search slowly, and then receives correlated series, wherein 1≤i≤n-1 with frequency f i+1;
After step (3), sender send correlated series, send the calibration jumping that n jumps to receiver again; After receiver receives that the calibration of n jumping is jumped, prepare to receive duties information;
Step (4), sender carry out the temporal information of sender and duties information to be defeated by receiver by jump set after chnnel coding becomes interlacing frames;
Step (5), receiver carry out deinterleaving and channel-decoding after receiving complete interlacing frames, restore temporal information and duties information.
Compared with prior art, the present invention has following advantage and beneficial effect:
1, the synchronizing frequency of using in the frequency hopping synchronization method, a part are time dependent frequencies, and a part is the frequency of sending and receiving letter machine both sides agreement.Like this, the frequency that had both changed in the synchronizing frequency has fixing frequency again, has guaranteed that both sides do not have synchronous reliability under the condition that the time difference requires, and also have stronger disguise simultaneously.
2, the present invention's foundation that frequency hopping is synchronous mainly is divided into three phases: jump synchronous slow search phase, calibration jumping stage and duties message transmission stage.Jumping the synchronously slow search phase, sender adopts class frequency circulation to send, and receiver adopts a same class frequency to search for slowly, and receiver constantly detects the correlated series that sender sends over by correlator simultaneously, in case correlator has been gone up synchronously, promptly finished and jumped alignment and sampled point alignment.In the calibration jumping stage, the sender transmission frequency that data adopted is consistent with the synchronously slow search phase of jumping; And the employing frequency consistent with sender search for soon, still calibrates by correlator and jump search.In the duties transmit stage, sender carries out the temporal information of this terminal and other duties information to form interlacing frames and send after the chnnel coding; After receiver is received duties information, the other side's temporal information is replaced the temporal information of this terminal.Thereby the present invention can realize in the narrow-band high-speed frequency hopping communications process fast, frequency hopping is synchronous reliably, and this frequency hopping synchronized algorithm is to no time difference requirement between the sending and receiving letter machine, has broken away from traditional frequency hopping communications the requirement to temporal information.
3, the present invention's unpack synchronously such as jumping (being equivalent to the preamble word in the wide interval frequency hopping) and time, duties etc. of will being correlated with sends in different jumpings.Reduce the symbol quantity that contains in the every jumping of narrow-band high-speed frequency hopping system, solved the problem that every jumping time of narrow-band high-speed frequency hopping system is short, symbolic number is few.
Description of drawings
Fig. 1 is the structural representation that correlated series of the present invention is jumped;
Fig. 2 is the slow search procedure schematic diagram of the present invention;
Fig. 3 is TOD of the present invention and other duties information interlacing frames mode schematic diagram;
Fig. 4 is that sender of the present invention sends the flow chart of realizing;
Fig. 5 is that receiver of the present invention receives the flow chart of realizing.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto embodiment.
As Fig. 1～shown in Figure 5, the synchronous implementation method of narrow-band high-speed frequency hopping of the present invention, its implementation process specifically may further comprise the steps:
Step (1), n frequency hopping synchronizing frequency of generation, component frequency is the temporal information (TOD according to sender in n frequency, Time Of Data) and primary key send into the variable frequency that pseudo-code generator and then control frequency synthesizer produce, the remainder frequency is to send into the fixed frequency that pseudo-code generator and then control frequency synthesizer produce according to a string fixing data and primary key.Can guarantee that like this frequency hopping is synchronous and the time is irrelevant.
With the frequency of time correlation along with the variation of time in continuous variation, can select the high-order still TOD low level of TOD according to the needs decision of frequency change speed.In order to obtain frequency more at random, preferably adopt the lower position of TOD to produce the variable frequency part of frequency hopping synchronizing frequency.And the fixed frequency part of frequency hopping synchronizing frequency, it produces and to utilize the principle of pseudo-code generator control frequency synthesizer generation frequency consistent in principle and the prior art, so do not give unnecessary details.As TOD for 50 bit representations, then TOD39～TOD8 position is sent into pseudo-code generator and come the control frequency synthesizer to produce variable frequency, send into 0x7ffffff0,0x7ffffff1,0x7ffffff2 comes 3 fixed frequencies of control frequency synthesizer generation to pseudo-code generator.If sending and receiving time unanimity has then increased and has jumped synchronous probability.Also can determine the quantitative proportion of fixed frequency and variable frequency as required.
Step (2), jump synchronous slow search procedure as shown in Figure 2.Sender adopts n frequency to send correlated series to the receiver circulation, sends n+1 circulation altogether; Receiver adopts n the frequency identical with sender to search for slowly synchronously, and each search cycle is (n+1) t, searches for n time; If the frequency when receiver is synchronous is fi, then receiver withdraws from search slowly, and then receives correlated series, wherein 1≤i≤n-1 with frequency f i+1.Like this, the total n (n+1) of slow search procedure jumps, and the synchronous probability of jumping is wherein arranged n time.According to anti-interference and requirement synchronous probability, can select the search slowly of a plurality of circulations.
In Fig. 2, adopted 8 frequency circulations to send 9 times.F1～f5 is the variable frequency relevant with TOD in 8 cycle frequencys, and f6～f8 is and the irrelevant fixed frequency of TOD that the quantitative proportion of fixed frequency and variable frequency is 3: 5.Receiver is changed frequency search 8 times, uses fixed frequency to have three times in 8 search.That is to say that whole search procedure has 3 chances can be synchronous with fixed frequency, 5 times chance uses variable frequency synchronous.
Sender is to the correlated series that receiver sent, and its content is that sending and receiving letter machine is all predicted; The structural representation that correlated series is jumped as shown in Figure 1.Receiver preset correlated series in the correlator as consensus sequence; Whenever receive that then a sampling point all will carry out related operation with sampling point and the correlator consensus sequence that length is jumped in the front one of being received.
After a described circulation sends through step (2), in complete one time of jumping, there is the n secondary frequencies to align between the sending and receiving letter machine both sides; After the frequency alignment, correlated series that sender sends and the consensus sequence in the receiver correlator be the sampling point complete matching one by one, and correlator is correlated with successfully, and sending and receiving letter machine both sides finish the sampled point alignment, have promptly finished and have jumped alignment.
After step (3), sender send correlated series, send the calibration jumping that n jumps to receiver again; After receiver receives that the calibration of n jumping is jumped, prepare to receive duties information.
After the described jumping alignment of completing steps (2), receiver does not know that still when sender sends synchronous head, begins to enter the duties transmission of Information.So after sending n (n+1) jumping, needing to send n, sender jumps the calibration jumping.Calibration is jumped as the sign of jumping the conversion of alignment and temporal information process of transmitting and is jumped; Receive that in calibration one jumps after calibration jumps when receiver the jumping stage, finish and just begin to prepare to receive duties information after this circulation receives.
Step (4), sender carry out the temporal information of sender and duties information to be defeated by receiver by jump set after chnnel coding becomes interlacing frames.With of the form transmission of duties information, jump and only finish the function of jumping alignment and sampled point alignment synchronously with data.Be convenient to like this realize that the narrow-band high-speed frequency hopping is synchronous.
Though it is synchronous to have finished frequency hopping during jumping is in front jumped with calibration synchronously, sending and receiving letter machine both sides' frequency patterns not enough at random.Only when use TOD lowest order separately carried out frequency computation part fully, frequency just more at random for sending and receiving letter machine both sides.Sender carries out the TOD and the necessary duties information of sender chnnel coding (as the RS coding), is transferred to receiver after being woven into interlacing frames in the mode that passes data, and after sending and receiving letter machine both sides' TOD was in full accord, frequency hopping was just really set up synchronously.The transmission of duties information is owing to can not make mistakes necessary antiblocking interference and random disturbances.Transmit with multi-hop so duties information adopts channel coding method to carry out jumping TOD information with one, and form an interlacing frames of finishing.The structure of interlacing frames as shown in Figure 3.
Step (5), receiver carry out deinterleaving and channel-decoding after receiving complete interlacing frames, restore temporal information and duties information.The initial data of recover is carried out verification, if correct, with the TOD of sender TOD as this terminal.After sending and receiving both sides TOD agreed, both sides had carried out the frequency calculation in the following data transmission procedure with regard to sending in the frequency synthesizer with TOD separately.In communication process next time, because TOD is relatively more consistent after the intercommunication just, n synchronizing frequency can reach in full accord, and synchronous probability can improve greatly.
The foregoing description is a preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (5)
1, the synchronous implementation method of a kind of narrow-band high-speed frequency hopping is characterized in that may further comprise the steps:
Step (1), produce n frequency hopping synchronizing frequency, component frequency is the variable frequency according to the time information generating of sender in n frequency, and the remainder frequency is the fixed frequency according to a string fixing data generation;
Step (2), sender adopt n frequency to send correlated series to the receiver circulation, send n+1 circulation altogether; Receiver adopts n the frequency identical with sender to search for slowly synchronously, and each search cycle is (n+1) t, searches for n time; If the frequency when receiver is synchronous is fi, then receiver withdraws from search slowly, and then receives correlated series, wherein 1≤i≤n-1 with frequency f i+1;
After step (3), sender send correlated series, send the calibration jumping that n jumps to receiver again; After receiver receives that the calibration of n jumping is jumped, prepare to receive duties information;
Step (4), sender carry out the temporal information of sender and duties information to be defeated by receiver by jump set after chnnel coding becomes interlacing frames;
Step (5), receiver carry out deinterleaving and channel-decoding after receiving complete interlacing frames, restore temporal information and duties information.
2, the synchronous implementation method of narrow-band high-speed frequency hopping according to claim 1 is characterized in that: variable frequency produces according to the temporal information low level of sender in the described step (1).
3, the synchronous implementation method of narrow-band high-speed frequency hopping according to claim 1 is characterized in that: the quantitative proportion of fixed frequency and variable frequency is 3: 5 in the described step (1).
4, according to the synchronous implementation method of each described narrow-band high-speed frequency hopping among the claim 1-3, it is characterized in that: variable frequency is sent into pseudo-code generator and then the generation of control frequency synthesizer according to the temporal information and the primary key of sender in the described step (1), and fixed frequency is according to a string fixing data and primary key is sent into pseudo-code generator and then the control frequency synthesizer produces.
5, the synchronous implementation method of narrow-band high-speed frequency hopping according to claim 1 is characterized in that: the chnnel coding that is adopted in the described step (4) is the RS coding.
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Cited By (9)
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| CN101882947A (en) * | 2010-04-22 | 2010-11-10 | 中国电子科技集团公司第三十研究所 | Non-time difference limited frequency hopping synchronization method |
| CN101895314A (en) * | 2010-02-08 | 2010-11-24 | 北京韦加航通科技有限责任公司 | Method for realizing time synchronization by using frequency hopping synchronous codes |
| CN102694574A (en) * | 2011-03-22 | 2012-09-26 | 余碧峰 | Hopping-rate-related and interval-related shift frequency-hopping communication method |
| CN104052524A (en) * | 2014-07-03 | 2014-09-17 | 中国人民解放军国防科学技术大学 | GPS-assisted fast frequency hopping synchronization method |
| CN104993845A (en) * | 2015-06-09 | 2015-10-21 | 哈尔滨工业大学 | Frequency hopping pattern synchronization method for fast frequency hopping system |
| CN106374970A (en) * | 2016-11-05 | 2017-02-01 | 福建省北峰电讯科技有限公司 | Device and method for narrowband frequency hopping communication of millions of times |
| CN110224954A (en) * | 2019-06-10 | 2019-09-10 | 中国人民解放军陆军工程大学 | A kind of anti-tracking interference realization method and system of the communication based on base band signal process |
| CN112994742A (en) * | 2019-12-16 | 2021-06-18 | 鹤壁天海电子信息系统有限公司 | Method for realizing frequency hopping synchronization, receiver and communication equipment |
| CN114665921A (en) * | 2020-12-23 | 2022-06-24 | 徐正平 | Method for realizing asynchronous hopping communication by using multiple electromagnetic wave frequencies |
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| CN100372248C (en) * | 2003-11-14 | 2008-02-27 | 华为技术有限公司 | Frequency hopping sequence generating method for realizing blue tooth cellural organized net |
| CN100464612C (en) * | 2007-01-22 | 2009-02-25 | 协同智迅通信技术（深圳）有限公司 | Digital cluster communication method with the control channel frequency hopping function |
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| CN101895314A (en) * | 2010-02-08 | 2010-11-24 | 北京韦加航通科技有限责任公司 | Method for realizing time synchronization by using frequency hopping synchronous codes |
| CN101882947A (en) * | 2010-04-22 | 2010-11-10 | 中国电子科技集团公司第三十研究所 | Non-time difference limited frequency hopping synchronization method |
| CN101882947B (en) * | 2010-04-22 | 2013-05-22 | 中国电子科技集团公司第三十研究所 | Non-time difference limited frequency hopping synchronization method |
| CN102694574A (en) * | 2011-03-22 | 2012-09-26 | 余碧峰 | Hopping-rate-related and interval-related shift frequency-hopping communication method |
| CN102694574B (en) * | 2011-03-22 | 2014-06-11 | 余碧峰 | Hopping-rate-related and interval-related shift frequency-hopping communication method |
| CN104052524A (en) * | 2014-07-03 | 2014-09-17 | 中国人民解放军国防科学技术大学 | GPS-assisted fast frequency hopping synchronization method |
| CN104993845A (en) * | 2015-06-09 | 2015-10-21 | 哈尔滨工业大学 | Frequency hopping pattern synchronization method for fast frequency hopping system |
| CN104993845B (en) * | 2015-06-09 | 2017-10-03 | 哈尔滨工业大学 | Frequency hopping pattern synchronous method for quick frequency hopping system |
| CN106374970A (en) * | 2016-11-05 | 2017-02-01 | 福建省北峰电讯科技有限公司 | Device and method for narrowband frequency hopping communication of millions of times |
| CN110224954A (en) * | 2019-06-10 | 2019-09-10 | 中国人民解放军陆军工程大学 | A kind of anti-tracking interference realization method and system of the communication based on base band signal process |
| CN112994742A (en) * | 2019-12-16 | 2021-06-18 | 鹤壁天海电子信息系统有限公司 | Method for realizing frequency hopping synchronization, receiver and communication equipment |
| CN114665921A (en) * | 2020-12-23 | 2022-06-24 | 徐正平 | Method for realizing asynchronous hopping communication by using multiple electromagnetic wave frequencies |
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