CN105227246B - It is a kind of to utilize the underwater acoustic communication method for being segmented the imitative dolphin whistle signal of LFM signals - Google Patents
It is a kind of to utilize the underwater acoustic communication method for being segmented the imitative dolphin whistle signal of LFM signals Download PDFInfo
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Abstract
The underwater acoustic communication method for being segmented the imitative dolphin whistle signal of LFM signals is utilized the invention discloses a kind of.The characteristics of being changed over time according to dolphin whistle signal frequency, utilize multiple LFM signal subsections combine analog dolphin whistle signals, modulates information to LFM signals is realized using BOK methods, and then realizes the bionical underwater sound communication modulation based on dolphin whistle signal and LFM signals.The centre frequency and frequency modulation rate of every section of LFM signal in the reception data after equilibrium are estimated in receiving terminal, and the dolphin whistle signal sample used during based on modulation, it is demodulated, obtains modulation intelligence.The underwater acoustic communication method of dolphin whistle signal is imitated using segmentation LFM, it is possible to achieve the bionic camouflage underwater sound communication of high fidelity is carried out using simple linear FM signal, strengthen the disguise and practicality of communication.
Description
Technical field
The water that LFM signals imitate dolphin whistle signal is segmented the invention belongs to field of underwater acoustic communication, more particularly to a kind of utilize
Acoustic communication method.
Background technology
In recent years, with the development of modern Detection Techniques, concealed requirement is proposed to underwater sound communication.
Traditional concealed communication method is signal of communication is hidden in ambient noise, i.e., hidden under Low SNR
Communication.But it is due to time extension, frequency expansion and the serious attenuation characteristic of underwater acoustic channel, the signal of identical sound source level is not
The covert communications in different distance being realized, especially when there is audiomonitor between transmitting-receiving node, will be unable to realize hidden lead to
Letter.It is different from the hidden underwater sound communication of low signal-to-noise ratio, utilize the camouflage underwater sound communication side for being segmented the imitative dolphin whistle signal of LFM signals
Method, is used as information carrier, it is allowed to which signal of communication is detected using dolphin whistle signal intrinsic in ocean, but in identification process
In be taken as marine biological noise to exclude, reach the effect of covert communications, trial solves the problems, such as covert communications under water
A kind of bionical underwater sound based on difference Pattern pattern time-delay codings is disclosed in Chinese patent CN103368660A to lead to
Letter method.Dolphin cry signal is applied in difference Pattern pattern time-delay coding communication systems by this method, bionical hidden to reach
Cover the purpose of communication.Disclose a kind of bionical based on Virtual time reversal mirror M members in Chinese patent specification CN103401619A
The underwater acoustic communication method of Signal coding, this method is equally modulated using dolphin cry signal, realizes covert communications.But,
Both communication systems are encoded using time delay, rather than BOK modulation；Meanwhile, both, which communicate, uses the ticktack of dolphin
Acoustical signal, not whistle signal.Real dolphin cry signal is communicated, sample quality of the communication efficiency dependent on use,
Using inconvenience.Chinese patent specification CN102355440A discloses a kind of underwater sound based on very small linear frequency modulation keying modulation
Communication means, this method realizes high-rate information transmission using the ultra-narrow band signal of very small linear frequency modulation keying modulation, but simultaneously
Do not emphasize the concealment of communication.
The content of the invention
It is an object of the invention to provide a kind of simple and easy to apply, amount of calculation is less, dolphin whistle is imitated using LFM signals are segmented
The underwater acoustic communication method of signal.
It is a kind of to be comprised the following steps using the underwater acoustic communication method for being segmented the imitative dolphin whistle signal of LFM signals,
Step one：Dolphin whistle signal is chosen, Short Time Fourier Transform is carried out to dolphin whistle signal, its time-frequency spectrum is obtained
Contour curve figure；
Step 2：The time shaft of dolphin whistle time-frequency spectral curve equidistantly take a little according to symbol width, Mei Geshi
Between put respectively correspond to a dolphin whistle signal instantaneous frequency values fi, obtain one group of frequency values f corresponding with time point；
Step 3：Coding to be sent is obtained by modulating, if coding number is not the class frequency value f intermediate frequencies obtained
The integral multiple of the number of rate, then supplement code element behind coding to be sent so that encode number after supplement to obtain one group
The integral multiple of the number of frequency in frequency values f；
Step 4：BOK modulation is carried out to sent coding, the frequency modulation rate value corresponding to each code element is determined, obtains
Tune group of frequencies k after one group of modulation；
Step 5：Each frequency values in one class frequency value f of acquisition are circulated in order and are used as every section of LFM signal
Reference frequency, using symbol width T as the duration of every section of LFM signal, by each the tune frequency values adjusted in group of frequencies k in order
As the frequency modulation rate of every section of LFM signal, every section of LFM signal is produced, by obtained LFM signals by frequency values f order in the time
On be combined, form one section of segmentation LFM and imitate whistle data-signal；
Step 6：The multistage segmentation LFM of acquisition is imitated into whistle data-signal to be combined in order, every section of imitative whistle data
Blank protection interval is added between signal, total imitative whistle data-signal is obtained；
Step 7：Synchronizing signal is the dolphin whistle signal that obtains in step one, by synchronizing signal and total imitative whistle number
It is believed that number between one section of blank protection interval of addition be combined, obtain bionical communication transmitting frame signal；
Step 8：Bionical communication transmitting frame signal is launched, after underwater acoustic channel, signal is received in receiving terminal；
Step 9：Signal will be received and carry out copy related operation with dolphin whistle signal, find and corresponded at peak-peak
Time point be synchronizing signal starting point, add the duration of synchronizing signal and the duration of blank protection interval in step 7, really
Determine the start time point of bionic data signal；
Step 10：To having determined that the bionic data signal of start time point carries out equilibrium, the bionical number after being equalized
It is believed that number；
Step 11：To the bionic data signal after equilibrium, intercepted by length of symbol width, and exclude sky
White protection interval；
Step 12：Every section of LFM signal after interception is demodulated, modulation intelligence is obtained.
The present invention is a kind of using the underwater acoustic communication method for being segmented the imitative dolphin whistle signal of LFM signals, can also include
1st, every section of LFM signal is：
Wherein, T is symbol width, fiFor i-th of frequency values, kiCorresponding frequency modulation rate.
2nd, the bionic data signal after equilibrium is：
R (t)=sr(t)*h'(-t)
=[s (t) * h (t)] * h'(-t)+n (t) * h'(-t)
=s (t) * [h (t)] * h'(-t)+n (t) * h'(-t)
Wherein, sr(t) it is the signal received, s (t) is that frame signal is launched in bionical communication, and n (t) is noise signal, h (t)
For the impulse response function of channel, h'(t) it is the channel impulse response function estimated, pass through the synchronizing signal to receiving and original
The whistle signal of beginning makees the related acquisition of copy.
3rd, the method being demodulated to every section of LFM signal after interception is Fourier Transform of Fractional Order parameter Estimation demodulation method
Either match correlation demodulation method.
4th, Fourier Transform of Fractional Order parameter Estimation demodulation method is：
Bionic data signal is segmented according to symbol width, every section of LFM signals y is extracted successivelyi(t) y, is soughti(t)
Fourier Transform of Fractional Order Y under different ordersp(u), parameter Estimation is carried out to obtain
It is rightCarry out polarity judgement：IfThen i-th section of LFM signal demodulation resultIfThen i-th section of LFM
Signal demodulation result
Finally all demodulation results are carried out and closed, final modulation intelligence is obtained
5th, matching correlation demodulation method is：
Bionic data signal is segmented according to symbol width, every section of LFM signals y is extracted successivelyi(t), produce respectively
It is raw to correspond to " 1 " every section of LFM signals s1i(t) and corresponding to every section of LFM signals s of " 0 "0i(t) y, is then obtained respectivelyi(t) and
s1i(t) correlation function R1i(τ), and yiAnd s (t)0i(t) correlation function R0i(τ)：
Then R is contrasted1i(τ) and R0iThe size of (τ) relevant peaks, to determine the corresponding code element of i-th section of LFM signal：If R1i
(τ)>R0i(τ), then i-th section of LFM signal demodulation resultIf R1i(τ)<R0i(τ), then i-th section of LFM signal demodulation result
Finally the demodulation result of every section of LFM signal is combined, final demodulation code is obtained
Beneficial effect：
By emulation experiment and tank experiments, the feasibility of this method is verified.- 10dB is realized in emulation experiment
Zero bit error rate communicates under the conditions of signal to noise ratio, and tank experiments realize zero mistake under the conditions of 19 rice grain pattern communication distances, 20 milliseconds of symbol widths
Bit rate communication.
Using the communication means of the present invention communicated using the imitative dolphin whistle signals of LFM, it is possible to use segmentation LFM
Frequency signal is modulated demodulation as carrier wave, and simple and easy to apply, amount of calculation is smaller, and traffic rate is moderate.Meanwhile, the imitative sea after synthesis
Globefish whistle signal is disguised higher, it is possible to achieve camouflage covert communications.
Brief description of the drawings
Fig. 1 is using being segmented the flow chart that the imitative dolphin whistle signals of LFM are communicated；
Fig. 2 is true dolphin whistle signal time-frequency spectrum curve map；
Fig. 3 is the true dolphin whistle signal fundamental wave time-frequency spectrum curve map of one extracted；
Fig. 4 is modulation principle figure；
Fig. 5 is bionical segmentation LFM spectrum diagrams；
Fig. 6 is transmission signal frame structure schematic diagram；
Fig. 7 is transmission signal waveform time-frequency spectrum curve map；
Fig. 8 is subjunctive mood time reversal mirror schematic diagram；
Fig. 9 is Fourier Transform of Fractional Order demodulation principle figure；
Figure 10 is matching relative theory figure.
Embodiment
The present invention is described in further details below in conjunction with accompanying drawing.
The technical problem to be solved in the present invention is to propose that a kind of utilize is segmented the imitative dolphin whistle signal of LFM signals, is realized imitative
The method of raw hidden underwater sound communication.
The object of the invention technical scheme is realized, as shown in Figure 1：
It is a kind of to utilize the camouflage underwater acoustic communication method for being segmented the imitative dolphin whistle signal of LFM signals, it is characterised in that：
In transmitting terminal：
Step 1：Suitable dolphin whistle signal is chosen, Short Time Fourier Transform is carried out to dolphin whistle signal, it is obtained
Time-frequency spectrum contour curve figure；
Step 2：The time shaft of the dolphin whistle time-frequency spectral curve described in step 1 is equidistantly taken according to symbol width
Point, each time point corresponds to the instantaneous frequency values f of a dolphin whistle signali, so that obtain one group it is corresponding with time point
Frequency values f；
Step 3：Obtain modulation intelligence；
Step 4：The modulation intelligence that step 3 is obtained carries out BOK modulation, determines that the frequency modulation rate corresponding to each code element takes
Value k0Or k1, and its putting in order according to symbol order, the tune group of frequencies k after one group of modulation is obtained, for example：0 corresponds to k0
=-40000Hz/s, 1 corresponds to k1=+40000Hz/s, is encoded to 011010, then the tune group of frequencies k obtained is：
k0k1k1k0k1k0；
Step 5：It regard each frequency values in the class frequency value f that step 2 is obtained as every section of LFM signal in order
Reference frequency, each using symbol width T as the duration of every section of LFM signal, in the tune group of frequencies k obtained using step 4
Adjust frequency values in order as the frequency modulation rate of every section of LFM signal, produce every section of LFM signal, these signals are obtained by step 2
Frequency values f order is combined in time, is formed one section of segmentation LFM and is imitated whistle data-signal；
Step 6：Total bionic data signal is obtained, content includes
(1) product that coding total duration is equal to he number and symbol width in the modulation intelligence described in step 3 is defined, it is fixed
Adopted code length is total he number of the coding described in step 3；
(2) if coding number is less than the number of frequency in the class frequency value f that step 2 is obtained, that is, total duration is encoded small
In the length of whistle signal, then to ensure the integrality of imitative whistle signal, supplement one that should be appropriate behind original code element
The code element of fixed number amount so that code length is identical with the number of frequency in the class frequency value f that step 2 is obtained after supplement, then
Step 5 is carried out again；
(3) if code length is more than the number of frequency in the class frequency value f that step 2 is obtained, that is, total duration is encoded big
In the length of whistle signal, then the frequency values f that can be obtained step 2 is recycled, and repeats step 5, until surplus
Remaining code length is less than after f number, (2) in repeat step 6；
(4) when supplementing code element, trend changed over time according to dolphin whistle signal time-frequency spectrum contour curve in step 1 and entered
Row complement code, for example：If time-frequency spectrum contour curve is on a declining curve with the time, 0 yard should be supplemented；If time-frequency spectrum contour curve is at any time
Between it is in rising trend, then should mend 1 yard；
(5) the multistage segmentation LFM of acquisition is imitated into whistle data-signal to be combined in order, every section of imitative whistle data-signal
Between add blank protection interval, obtain total imitative whistle data-signal；
Step 7：Synchronizing signal is the real dolphin whistle signal described in step 1, and synchronizing signal is obtained with step 6
Imitative whistle data-signal between one section of blank protection interval of addition be combined, obtain bionical communication transmitting frame signal；
Step 8：The transmitting frame signal that step 7 is obtained is launched, after underwater acoustic channel, is received and is believed in receiving terminal
Number；
In receiving terminal：
Step 9：The docking collection of letters number is synchronized, and method is will to receive signal with the dolphin whistle signal described in step 1 to enter
Row copy related operation, finds peak-peak place corresponding time point, the as starting point of synchronizing signal, and then plus step
The duration of synchronizing signal described in 7 and the duration of blank protection interval, determine the start time point of bionic data signal；
Step 10：Equilibrium is carried out to the bionic data signal for having determined time starting point described in step 9, is equalized
Bionic data signal afterwards；
Step 11：Bionic data signal after the equilibrium obtained to step 10, is being intercepted by length of symbol width,
And exclude blank protection interval；
Step 12：Every section of LFM signal after interception described in step 10 is demodulated, modulation intelligence is obtained.
Above-mentioned is imitated in the communication means that dolphin whistle signal is communicated using LFM, the dolphin whistle used in step 1
Signal is the whistle signal for all kinds of dolphins that actual acquisition is arrived, and will be entered on a timeline with symbol width frequency spectrum profiles curve at that time
Row equidistantly divide after choose correspondence time point frequency values as every section of LFM signal reference frequency, using symbol width as
The duration of every section of LFM signal, is modulated using the slope of every section of LFM signal, can obtain listening domain from time-frequency domain and human ear
The upper imitative whistle data-signal similar to dolphin whistle.Original whistle signal is added before bionic data signal again as synchronous letter
Number, you can form bionical communication frame.In transmitting procedure, even if the signal of communication is intercepted and captured by enemy, can also identification when quilt
As biological cry intrinsic in ocean so as to be excluded, the purpose of bionical covert communications has been reached.It is first when receiving terminal is demodulated
Equilibrium is carried out first with subjunctive mood time reversal mirror, is then demodulated using Fourier Transform of Fractional Order or matching correlation,
Obtain modulation intelligence.
Some explanation is done to the present invention below：Dolphin whistle signal in step 1 refers to the whistle signal of all kinds of dolphins.
Used time-frequency spectrum contour curve is dolphin whistle signal fundamental wave time-frequency spectrum contour curve in step 2.Every section described in step 5
The reference frequency of LFM signals refers to the centre frequency of every section of LFM signal.When the equalization methods used in step 10 is subjunctive moods
Between time reversal equalization methods.Blank protection interval length described in step 6 is 50ms.Blank protection interval described in step 7 is long
Spend for 1s.Synchronizing signal described in step 7 is the whistle signal described in step 1.The demodulation method used in step 12 can be with
For Fourier Transform of Fractional Order parameter Estimation demodulation method.The demodulation method used in step 12 can be matching correlation demodulation side
Method.
The camouflage underwater acoustic communication method for being segmented the imitative dolphin whistle signal of LFM signals is utilized the present invention relates to a kind of.
Dolphin main signal of communication during the whistle signal of dolphin, its video envelope is similar with chirp signals, therefore can be with
Dolphin whistle signal is simulated using LFM signals are segmented, the communication information is carried using LFM signals, is communicated, is realized imitative
Dolphin whistle signal covert communications.
In transmitting terminal：
Step 1：Suitable dolphin whistle signal is chosen, Short Time Fourier Transform is carried out to dolphin whistle signal, it is obtained
Time-frequency spectrum contour curve figure, as shown in Figures 2 and 3.
Step 2：The time shaft of the dolphin whistle time-frequency spectral curve described in step 1 is equidistantly taken according to symbol width
Point, each time point corresponds to the instantaneous frequency values f of a dolphin whistle signali, so that obtain one group it is corresponding with time point
Frequency values f；
Step 3：Modulation intelligence is obtained, as shown in Figure 4；
Step 4：The modulation intelligence that step 3 is obtained carries out BOK modulation, determines that the frequency modulation rate corresponding to each code element takes
Value k0Or k1, and its putting in order according to symbol order, the tune group of frequencies k after one group of modulation is obtained, for example：0 corresponds to k0
=-40000Hz/s, 1 corresponds to k1=+40000Hz/s, is encoded to 011010, then the tune group of frequencies k obtained is：
k0k1k1k0k1k0；
If unipolar binary to be modulated is encoded to a={ 1,0,1,1,0,0,1 ... }, BOK modulation is carried out to it, correspondence
Tune group of frequencies k={ k1,k0,k1,k1,k0,k0,k1…}。
Step 5：It regard each frequency values in the class frequency value f that step 2 is obtained as every section of LFM signal in order
Reference frequency, each using symbol width T as the duration of every section of LFM signal, in the tune group of frequencies k obtained using step 4
Adjust frequency values in order as the frequency modulation rate of every section of LFM signal, produce every section of LFM signal, these signals are obtained by step 2
Frequency values f order is combined in time, is formed one section of segmentation LFM and is imitated whistle data-signal, as shown in Figure 5；
If i-th of frequency values is fi, corresponding frequency modulation rate is ki, then i-th section of linear FM signal s can be obtainedi(t) it is：
Wherein, T is symbol width.The instantaneous frequency of the signal is：
Step 6：Total bionic data signal is obtained, content includes
(1) product that coding total duration is equal to he number and symbol width in the modulation intelligence described in step 3 is defined, it is fixed
Adopted code length is total he number of the coding described in step 3；
(2) if coding number is less than the number of frequency in the class frequency value f that step 2 is obtained, that is, total duration is encoded small
In the length of whistle signal, then to ensure the integrality of imitative whistle signal, supplement one that should be appropriate behind original code element
The code element of fixed number amount so that code length is identical with the number of frequency in the class frequency value f that step 2 is obtained after supplement, then
Step 5 is carried out again；
(3) if code length is more than the number of frequency in the class frequency value f that step 2 is obtained, that is, total duration is encoded big
In the length of whistle signal, then the frequency values f that can be obtained step 2 is recycled, and repeats step 5, until surplus
Remaining code length is less than after f number, (2) in repeat step 6；
(4) when supplementing code element, trend changed over time according to dolphin whistle signal time-frequency spectrum contour curve in step 1 and entered
Row complement code, for example：If time-frequency spectrum contour curve is on a declining curve with the time, 0 yard should be supplemented；If time-frequency spectrum contour curve is at any time
Between it is in rising trend, then should mend 1 yard；
(5) the multistage segmentation LFM of acquisition is imitated into whistle data-signal to be combined in order, every section of imitative whistle data-signal
Between add blank protection interval, obtain total imitative whistle data-signal；
Step 7：Synchronizing signal is the real dolphin whistle signal described in step 1, and synchronizing signal is obtained with step 6
Imitative whistle data-signal between one section of blank protection interval of addition be combined, obtain bionical communication transmitting frame signal, such as Fig. 6
With shown in Fig. 7；
Step 8：The transmitting frame signal that step 7 is obtained is launched, after underwater acoustic channel, is received and is believed in receiving terminal
Number；
In receiving terminal：
Step 9：The docking collection of letters number is synchronized, and method is will to receive signal with the dolphin whistle signal described in step 1 to enter
Row copy related operation, finds peak-peak place corresponding time point, the as starting point of synchronizing signal, and then plus step
The duration of synchronizing signal described in 7 and the duration of blank protection interval, determine the start time point of bionic data signal；
Step 10：Equilibrium is carried out to the bionic data signal for having determined time starting point described in step 9, is equalized
Bionic data signal afterwards；
Equalization methods use subjunctive mood time reversal mirror balancing technique.As shown in figure 8, in this patent, detectable signal and
Synchronizing signal is same signal.In receiving terminal, to the detectable signal p receivedr(t) copied with original detectable signal p (t)
Correlation, so as to estimate the impulse response function h'(t of channel), then being carried out time reversal obtains h'(-t).It will receive
The data letter s arrivedrNumber (t) and h'(-t) make convolution, obtain the signal r (t) finally virtually received, its waveform is similar to former letter
Waveform is ceased, portfolio effect is reached.Virtual time reversal mirror processing procedure expression formula is as follows：
sr(t)=s (t) * h (t)+n (t) (3)
R (t)=sr(t)*h'(-t)
=[s (t) * h (t)] * h'(-t)+n (t) * h'(-t) (4)
=s (t) * [h (t)] * h'(-t)+n (t) * h'(-t)
Note：Referred to as virtual time reversal channel, can be considered as that signal eventually passes through is " total
Channel ".After signal is by virtual time reversal channel, direct signal is more much higher than multi-path signalses energy, it is suppressed that underwater acoustic channel
The intersymbol interference that multi-path effect is brought, simultaneously as noise is non-coherent addition, the technology can also improve signal to noise ratio.
Step 11：Bionic data signal after the equilibrium obtained to step 10, is being intercepted by length of symbol width,
And exclude blank protection interval；
Step 12：Every section of LFM signal after interception described in step 10 is demodulated, modulation intelligence is obtained.
Demodulation method can either match correlation demodulation method for Fourier Transform of Fractional Order parameter Estimation demodulation method.
(1) Fourier Transform of Fractional Order parameter Estimation demodulation method：
In demodulation, it is first according to symbol width and bionic data signal is segmented, every segment signal is extracted successively.Such as
Shown in Fig. 9.Assuming that extracting i-th section of LFM signals y in bionic data signali(t) y, is soughti(t) fraction under different orders
Rank Fourier transformation Yp(u), then utilize
Formula (5) carries out parameter Estimation to it, obtainsIt is rightCarry out polarity judgement：IfThen i-th section of LFM signal solution
Adjust resultIfThen i-th section of LFM signal demodulation resultFinally all demodulation results are carried out and closed, are obtained
To final modulation intelligence
(2) correlation demodulation method is matched
Because LFM signals have good correlated performance, the correlation peak of its auto-correlation function is very precipitous, similar to δ
Function, therefore can be demodulated using correlation technique is matched, as shown in Figure 10.
In demodulation, it is first according to symbol width and bionic data signal is segmented, every segment signal is extracted successively.
Receiving terminal, the frequency waypoint obtained according to step 2 produces correspond to " 1 " and every section of LFM signal corresponding to " 0 " respectively.Assuming that carrying
Take out i-th section of LFM signals y in bionic data signali(t), i-th section of LFM signal for corresponding to " 1 " is s1i(t), i-th section it is right
Ying Yu " 0 " LFM signals are s0i(t) y, is then obtained respectivelyiAnd s (t)1i(t) correlation function R1i(τ), and yi(t) and
s0i(t) correlation function R0i(τ), its calculation formula is as follows：
Then R is contrasted1i(τ) and R0iThe size of (τ) relevant peaks, to determine the corresponding code element of i-th section of LFM signal：If R1i
(τ)>R0i(τ), then i-th section of LFM signal demodulation resultIf R1i(τ)<R0i(τ), then i-th section of LFM signal demodulation resultFinally the demodulation result of every section of LFM signal is combined, final demodulation code is obtained
The camouflage underwater acoustic communication method for being segmented the imitative dolphin whistle signal of LFM signals, its feature are utilized the present invention relates to a kind of
It is：The characteristics of being changed over time according to dolphin whistle signal frequency, utilizes multiple LFM signal subsections combine analog dolphin whistles
Signal, is realized to the modulates informations of LFM signals using BOK methods, and then is realized imitative based on dolphin whistle signal and LFM signals
Unboiled water sound communication is modulated.In receiving terminal by Fourier Transform of Fractional Order to every section of LFM signal in the reception data after equilibrium
Centre frequency and frequency modulation rate are estimated, and the dolphin whistle signal sample used during based on modulation, are demodulated, are modulated
Information.The underwater acoustic communication method of dolphin whistle signal is imitated using segmentation LFM, it is possible to achieve utilize simple linear FM signal
The bionic camouflage underwater sound communication of high fidelity is carried out, strengthens the disguise and practicality of communication.
Claims (6)
1. a kind of utilize the underwater acoustic communication method for being segmented the imitative dolphin whistle signal of LFM signals, it is characterised in that：Including following step
Suddenly,
Step one：Dolphin whistle signal is chosen, Short Time Fourier Transform is carried out to dolphin whistle signal, frequency spectrum profiles at that time are obtained
Curve map；
Step 2：The time shaft of dolphin whistle time-frequency spectral curve equidistantly take a little according to symbol width, each time point
The instantaneous frequency values f of a dolphin whistle signal is corresponded to respectivelyi, obtain one group of frequency values f corresponding with time point；
Step 3：Coding to be sent is obtained by modulating, if coding number is not frequency in the class frequency value f obtained
The integral multiple of number, then supplement code element behind coding to be sent so that the class frequency for encoding number after supplement to obtain
The integral multiple of the number of frequency in value f；
Step 4：BOK modulation is carried out to sent coding, the frequency modulation rate value corresponding to each code element is determined, obtains one group
Tune group of frequencies k after modulation；
Step 5：Each frequency values in one class frequency value f of acquisition are circulated to the reference as every section of LFM signal in order
Frequency, using symbol width T as the duration of every section of LFM signal, using adjust group of frequencies k in each adjust frequency values in order as
The frequency modulation rate of every section of LFM signal, produces every section of LFM signal, obtained LFM signals is entered in time by frequency values f order
Row combination, forms one section of segmentation LFM and imitates whistle data-signal；
Step 6：The multistage segmentation LFM of acquisition is imitated into whistle data-signal to be combined in order, every section of imitative whistle data-signal
Between add blank protection interval, obtain total imitative whistle data-signal；
Step 7：Synchronizing signal is the dolphin whistle signal obtained in step one, and synchronizing signal is believed with total imitative whistle data
One section of blank protection interval is added between number to be combined, and obtains bionical communication transmitting frame signal；
Step 8：Bionical communication transmitting frame signal is launched, after underwater acoustic channel, signal is received in receiving terminal；
Step 9：Signal and dolphin whistle signal will be received and carry out copy related operation, find peak-peak place it is corresponding when
Between point be the starting point of synchronizing signal, the duration of synchronizing signal and the duration of blank protection interval in step 7 are added, it is determined that imitative
The start time point of raw data-signal；
Step 10：To having determined that it is balanced that the bionic data signal of start time point is carried out, the bionic data letter after being equalized
Number；
Step 11：To the bionic data signal after equilibrium, intercepted by length of symbol width, and excluding blank guarantor
Shield interval；
Step 12：Every section of LFM signal after interception is demodulated, modulation intelligence is obtained.
2. according to claim 1 a kind of using the underwater acoustic communication method for being segmented the imitative dolphin whistle signal of LFM signals, it is special
Levy and be：Every section of described LFM signal is：
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Wherein, T is symbol width, fiFor i-th of frequency values, kiCorresponding frequency modulation rate.
3. according to claim 1 a kind of using the underwater acoustic communication method for being segmented the imitative dolphin whistle signal of LFM signals, it is special
Levy and be：It is described it is balanced after bionic data signal be：
R (t)=sr(t)*h'(-t)
=[s (t) * h (t)] * h'(-t)+n (t) * h'(-t)
=s (t) * [h (t)] * h'(-t)+n (t) * h'(-t)
Wherein, sr(t) it is the signal received, s (t) is that frame signal is launched in bionical communication, and n (t) is noise signal, and h (t) is letter
The impulse response function in road, h'(t) for estimation channel impulse response function, by the synchronizing signal to receiving with it is original
Whistle signal makees the related acquisition of copy.
4. according to claim 1 a kind of using the underwater acoustic communication method for being segmented the imitative dolphin whistle signal of LFM signals, it is special
Levy and be：The described method being demodulated to every section of LFM signal after interception is Fourier Transform of Fractional Order parameter Estimation solution
Tune method either matches correlation demodulation method.
5. according to claim 4 a kind of using the underwater acoustic communication method for being segmented the imitative dolphin whistle signal of LFM signals, it is special
Levy and be：Described Fourier Transform of Fractional Order parameter Estimation demodulation method is：
Bionic data signal is segmented according to symbol width, every section of LFM signals y is extracted successivelyi(t) y, is soughti(t) not
With the Fourier Transform of Fractional Order Y under orderp(u), parameter Estimation is carried out to obtain
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It is rightCarry out polarity judgement：IfThen i-th section of LFM signal demodulation resultIfThen i-th section of LFM signal
Demodulation result
Finally all demodulation results are combined, final modulation intelligence is obtained
6. according to claim 5 a kind of using the underwater acoustic communication method for being segmented the imitative dolphin whistle signal of LFM signals, it is special
Levy and be：Described matching correlation demodulation method is：
Bionic data signal is segmented according to symbol width, every section of LFM signals y is extracted successivelyi(t) correspondence, is produced respectively
In " 1 " every section of LFM signals s1i(t) and corresponding to every section of LFM signals s of " 0 "0i(t) y, is then obtained respectivelyiAnd s (t)1i(t)
Correlation function R1i(τ), and yiAnd s (t)0i(t) correlation function R0i(τ)：
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Then R is contrasted1i(τ) and R0iThe size of (τ) relevant peaks, to determine the corresponding code element of i-th section of LFM signal：If R1i(τ) ＞
R0i(τ), then i-th section of LFM signal demodulation resultIf R1i(τ) ＜ R0i(τ), then i-th section of LFM signal demodulation result
Finally the demodulation result of every section of LFM signal is combined, final demodulation code is obtained
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| CN105833410B (en) * | 2016-05-27 | 2022-03-29 | 无锡丹辰智能科技有限公司 | Children autism auxiliary treatment equipment for realizing dolphin-like sound ultrasonic device |
| CN106503336B (en) * | 2016-10-21 | 2019-09-27 | 哈尔滨工程大学 | A kind of modeling of dolphin ticktack acoustical signal and synthetic method |
| CN106789794B (en) * | 2016-11-30 | 2019-05-28 | 厦门大学 | A kind of bionical communication means modulated using dolphin signal of communication frequency modulation |
| CN106899357B (en) * | 2017-03-13 | 2020-04-03 | 哈尔滨工程大学 | Disguised and concealed underwater communication device simulating dolphin whistle |
| CN108055087B (en) * | 2017-12-30 | 2024-04-02 | 天津大学 | Communication method and device for coding by using number of long-limb piloting whale sound harmonics |
| CN108667532B (en) * | 2018-04-11 | 2021-09-28 | 哈尔滨工程大学 | Burst type underwater acoustic communication method |
| CN108957412A (en) * | 2018-07-12 | 2018-12-07 | 西安电子科技大学 | Radar detection and method for communication transmission based on piece-wise linear FM signal |
| CN109085543B (en) * | 2018-08-24 | 2020-08-18 | 斯凯瑞利（北京）科技有限公司 | Linear frequency modulation signal generator |
| CN109347568B (en) * | 2018-09-05 | 2021-04-20 | 哈尔滨工程大学 | Dolphin whistle-imitating continuous phase multi-element frequency modulation underwater acoustic communication method |
| CN109347569B (en) * | 2018-09-05 | 2021-05-14 | 哈尔滨工程大学 | Disguised and concealed underwater acoustic communication method based on discrete cosine transform |
| CN111431625B (en) * | 2020-02-25 | 2021-07-27 | 天津大学 | Synthetic and modification method for vocals of cetacea animals |
| CN112953652B (en) * | 2021-01-27 | 2022-04-15 | 浙江大学 | Whale whistle-like communication method based on segmented time-frequency contour time delay modulation |
| CN113259016B (en) * | 2021-04-23 | 2022-09-13 | 西北工业大学 | Underwater sound concealed communication method based on dolphin whistle parameter model |
| CN115037386A (en) * | 2022-05-16 | 2022-09-09 | 广西民族大学 | Bionic communication signal simulation test method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3987455B2 (en) * | 2003-05-06 | 2007-10-10 | 日本電信電話株式会社 | Digital modulation transmitter |
| CN101813771A (en) * | 2009-12-08 | 2010-08-25 | 中国科学院声学研究所 | Dolphin biomimetic sonar signal processing method |
| CN104967489A (en) * | 2015-06-08 | 2015-10-07 | 哈尔滨工程大学 | Biomimetic underwater acoustic communication method of MSK signal embedded dolphin whistle signal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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-
2015
- 2015-10-13 CN CN201510676931.8A patent/CN105227246B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3987455B2 (en) * | 2003-05-06 | 2007-10-10 | 日本電信電話株式会社 | Digital modulation transmitter |
| CN101813771A (en) * | 2009-12-08 | 2010-08-25 | 中国科学院声学研究所 | Dolphin biomimetic sonar signal processing method |
| CN104967489A (en) * | 2015-06-08 | 2015-10-07 | 哈尔滨工程大学 | Biomimetic underwater acoustic communication method of MSK signal embedded dolphin whistle signal |
Non-Patent Citations (2)
| Title |
|---|
| M元仿海豚叫声隐蔽水声通信;刘凇佐等;《哈尔滨工程大学学报》;20131115;第35卷(第1期);全文 * |
| 一种利用海豚叫声的仿生水声通信方法;刘凇佐等;《物理学报》;20130528;第62卷(第14期);全文 * |
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