CN110460393A - The communication means of encoding and decoding is carried out using whale/dolphin cry number of pulses difference - Google Patents
The communication means of encoding and decoding is carried out using whale/dolphin cry number of pulses difference Download PDFInfo
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- CN110460393A CN110460393A CN201910579100.7A CN201910579100A CN110460393A CN 110460393 A CN110460393 A CN 110460393A CN 201910579100 A CN201910579100 A CN 201910579100A CN 110460393 A CN110460393 A CN 110460393A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
- H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
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Abstract
The invention discloses a kind of communication means that encoding and decoding are carried out using whale/dolphin click cry quantity variance, comprising: calls the preset condition that the delay inequality between pulse meets according to click, decodes the communication information；Flat pad: train of pulse is called to the M group click for representing N bit information and click calls impulse time delay difference τdIt is encoded, the time interval of communication symbol interval setter setting is identified, the time interval between adjacent click cry train of pulse is configured, the communication information after coding is converted into acoustic signals by underwater acoustic transducer and is sent；Receiving platform: the short-time energy spectrum that the acoustic signals received are normalized is calculated, detect and position position and time duration of each click cry pulse in received signal, click calls train of pulse identifier according to the principle of the time interval between the adjacent click cry train of pulse set in communication code, identification extracts each click cry train of pulse, it is sent to communication decoder, the delay inequality between the click cry train of pulse number and click cry pulse that each click cry train of pulse includes is demodulated, the communication information is decoded.
Description
Technical field
It a kind of is compiled the present invention relates to field of communication technology more particularly to using whale/dolphin cry number of pulses difference
Decoded communication means.
Background technique
Water sound communication technique is as underwater most effective means of communication, by remote, technology relative maturity of its communication distance etc.
Advantage, it has also become the main means of communication of communication and information sharing between underwater optimal in structure obtains greatly attention and hair
Exhibition, especially the concealment of underwater sound communication all the time under water defense military communication in play very important effect.It mentions
The concealment of high underwater sound communication, it is ensured that signal of communication is not detected by enemy and intercepted, and is made underwater information safe transmission, is protected simultaneously
The position of card subsurface communication platform is not exposed, and is of great significance safely to underwater information.
For underwater sound Covert Communication Technology, technologies go constantly to change traditional people when conventional method generally uses frequency hopping, jumps etc.
The parameter of signal of communication is made, or the signal-to-noise ratio by reducing voice signal makes conventional artificial's signal of communication be hidden in marine background
In noise, but these signals of communication all have obviously feature in time domain, frequency domain and time-frequency domain, it is easy to by enemy institute
It scouts, it is positioned and is destroyed.
Summary of the invention
The present invention provides a kind of communication means that encoding and decoding are carried out using whale/dolphin cry number of pulses difference, this hairs
It is special to solve artificial signal of communication in traditional underwater sound concealed communication method for the bright diversity that pulse is called based on whale/dolphin click
The problem of levying obviously and easily being identified by enemy, described below:
A kind of communication means carrying out encoding and decoding using whale/dolphin click cry quantity variance, which comprises
The short-time energy spectrum that the signal received is normalized is calculated in communication receiver, is composed and is counted according to short-time energy
It calculates result and obtains the click cry number of pulses for including in each click cry train of pulse, called between pulse according to click
Delay inequality meet preset condition, decode the communication information；
It communicates the realization of flat pad: train of pulse being called to the M group click for representing Nbit information and click calls pulse
Delay inequality τdIt is encoded, the time interval of communication symbol interval setter setting is identified, adjacent click is cried
Time interval between ping string is configured, and the communication information after coding is converted into acoustic signals by underwater acoustic transducer
It sends；
The realization of communications reception platform: the short-time energy spectrum that the acoustic signals received are normalized is calculated, detection
Position and time duration of the pulse in received signal are called with each click is positioned, click calls train of pulse identification
Device is according to the time interval T > τ between the adjacent click cry train of pulse set in communication codedmaxPrinciple, identification extract
Each click calls train of pulse out, and is sent to communication decoder, demodulates each click cry train of pulse and includes
Click calls the delay inequality between train of pulse number m and click cry pulse, decodes the communication information.
Wherein, the method also includes: communication code is designed according to whale/dolphin cry feature and sounding rule.
It is further, described that communication code is designed according to whale/dolphin cry feature and sounding rule specifically:
Gain adjustment and normalized energy are carried out to M+1 click cry pulse, guarantee each click cry pulse
Energy is greater than the energy threshold E of settingd；
M+1 click cry pulse is divided into M group click cry train of pulse, is arranged in every group and cries including at least 2 click
Ping,
M group click calls the binary data of pulse string encoding N1 bit, according to the quantity containing click cry pulse
Size carries out sequential encoding；
According to the time interval rule τ between the original click cry pulse of whale/dolphind, delay inequality minimum value, which is arranged, is
τmin。
Wherein, the Nbit information specifically:
M group click is chosen from click pulse signal library and calls train of pulse, is carried out according to the size comprising number of pulses
Sequence encodes N1bit information；
According to N2bit information, the delay inequality between click cry pulse is calculated, passes through communication symbol interval setting
Device is configured the time interval T of click cry train of pulse.
The present invention is based on whale/dolphin click cry pulse diversity, provide a kind of utilization whale/dolphin click cry
Number of pulses difference carries out the communication means of encoding and decoding, and the beneficial effect of the technical solution is:
(1) using the original cry signal of whale/dolphin as signal of communication, make its by real signal of communication accidentally conduct by
Marine animal noise caused by the animals such as whale and filter out, play itself purpose of camouflage, realize the concealment of communication；
(2) under the premise of no increase recipient decodes difficulty, it ensure that the diversity of sender's symbol；
(3) energy gain adjusting is carried out to whale/dolphin click cry train of pulse, avoids the lower click cry of energy
Train of pulse is fallen into oblivion by noise, so that the communication information is easy to be detected, ensure that decoding precision.
Detailed description of the invention
Fig. 1 is the waveform diagram that one section of whale/dolphin click calls pulse signal；
Fig. 2 is the schematic diagram for communicating flat pad 8；
Fig. 3 is the schematic diagram of communications reception platform 14；
Fig. 4 is the schematic diagram that the communication information waveform that pulse generates is called using click.
In Fig. 2: 1 calls burst blocks for click, and 2 be click pulse signal library, and 3 call pulse accumulator for click,
4 is communicate symbol interval setter, and 5 be the communication information to be sent, and 6 be communications encoder, and 7 be underwater acoustic transducer.
In Fig. 3: 9 be hydrophone, and 10 compose calculator for short-time energy, and 11 call train of pulse identifier for click, and 12 be logical
Believe decoder, 13 be communication information follower.
In Fig. 4: 15 call train of pulse to call the click of pulses comprising 2 click, and 16 is include 3 click crys
The click of pulse calls train of pulse, and 17 call train of pulse to call the click of pulse comprising 4 click, and 18 be to include 5
The click that click calls pulse calls train of pulse.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention is made below further
Ground detailed description.
Whale and dolphin belong to Cetacea class, their bodily forms are long, weight is big, are distributed widely in the non-icing sea area in the whole world；
They few then more than ten, more then tens first gregarious lives, and have fabulous dive potential.In order to prey on, exchange or other
Purpose, they can ceaselessly emit click into seawater and call pulse signal, and click cry pulse characteristic is very rich, has
It is single click pulse, has plenty of multiple click pulses and continuously emit and form click cry train of pulse, and each click is cried
Time interval between ping is different.
Using whale/dolphin click cry pulse diversity, artificial signal is used to be communicated with traditional communication method
Difference, the embodiment of the present invention from bionical angle, devise it is a kind of using whale in ocean/dolphin click cry pulse signal as
The communication means of signal of communication.The embodiment of the present invention is using whale/dolphin click cry quantity variance and click is combined to call arteries and veins
Delay inequality between punching carries out encoding and decoding, due to whale/dolphin click cry pulse diversity, ensure that the more of communication symbol
Sample is encoded in combination with the delay inequality between click cry train of pulse, improves traffic rate.
A kind of whale/dolphin click cry quantity variance is utilized to carry out encoding and decoding the purpose of the embodiment of the present invention is that providing
Communication means.
The first step designs communication code method according to whale/dolphin cry feature and sounding rule
In Fig. 1, the embodiment of the present invention gives one section of whale/dolphin click cry pulse signal waveform figure.Analyze whale/sea
The click cry impulse waveform of globefish it is found that the duration of whale/dolphin one click cry pulse be usually no more than 10ms, and
Time interval between adjacent click cry pulse differs.Assuming that finding out M+1 (M=from one section of cry signal of whale/dolphin
2N1, N1 is positive integer) and a click calls pulse, gain adjustment and normalized energy, guarantor are carried out to M+1 click cry pulse
The energy for demonstrate,proving each click cry pulse is greater than the energy threshold E of settingd, prevent the lower pulse of energy from decoding in receiver
When be buried in ambient noise information caused to lose.
Wherein, M+1 click cry pulse may be arranged combination and be further separated into M group click cry train of pulse, by
Delay inequality is encoded between click to be used cry pulse, calls arteries and veins so being arranged in every group and including at least 2 click
It rushes, includes in m groupA click calls train of pulse, and each click cry train of pulse includes m+1 click cry arteries and veins
Punching, the difference is that the m+1 click cry impulse waveform from M+1 click cry pulse sliced is different, if m group pulse string
Occur being the m1 times in the communication sequence of transmission, then selects to send in m groupThe in a click cry train of pulse
m1A train of pulse, because recipient need to only identify that the click in the communication information calls number of pulses, institute
It is without appoint transmission in advance with receiving-transmitting sidesWhich of a click cry train of pulse, this coding mode
Under the premise of no increase recipient decodes difficulty, the diversity of sender's symbol ensure that, make the carrying sent coding letter
The click cry pulse train of breath and the original click cry pulse of whale/dolphin are closer.
Due to M=2N1, M group click cry train of pulse can encode the binary data of N1 bit, according to containing click
The population size for calling pulse carries out sequential encoding, and the train of pulse specifically comprising 2 click cry pulses represents coding two
Binary information
Train of pulse comprising 3 click cry pulses represents coding binary informationWith such
It pushes away, the train of pulse comprising M+1 click cry pulse represents coding binary information
Simultaneously according to the time interval rule between the original click cry pulse of whale/dolphin, i.e. between two pulses when
Prolong poor τdCoding binary number, setting delay inequality minimum value are τmin, then τdIt may be expressed as:
τd=k τmin, k=1,2 ..., 2N2 (1)
In formula, N2 is positive integer, when k takes different value, delay inequality τdDifferent encoded informations can be represented, it can be achieved that coding
The binary data of N2 bit.Specifically when k=1, delay inequality τdRepresent coding binary informationk
When=2, delay inequality τdRepresent coding binary informationAnd so on, k=2N2When, delay inequality τdIt represents
Coding binary informationIt sets in m group and includesIt is each in a click cry train of pulse
The time interval that click is called between pulse is identical, is τdm, therefore utilize whale/dolphin click cry quantity variance and time delay
The number of bits that difference can encode are as follows:
N=N1+N2 (2)
Specifically, coding binary informationIt needs to choose and calls pulse comprising 2 click
Train of pulse, and k=1 wants coding binary informationIt needs to choose comprising 3 click
The train of pulse of pulse, and k=2 are called, and so on, coding binary informationIt needs
Choose the train of pulse comprising M+1 click cry pulse, and k=2N2。
For click each in communication sequence cry train of pulse is differentiated, it is desirable that between each click cry train of pulse
Time interval T is greater than delay inequality τ between click cry pulsedMaximum value, i.e. τdmax=2N2·τmin, to guarantee recipient
It can correctly identify the quantity of click cry pulse in each click cry train of pulse.
Further, it is as follows to provide a specific example, it is assumed that (pass through when needing to encode the information of N=4bits
Click calls number of pulses difference and encodes N1=2bits information, calls the pattern time-delay coding N2=between pulse by click
2bits information), choose 5 click from the cry pulse of whale/dolphin click and call pulses, to 5 click call pulses into
Row gain adjustment and normalized energy guarantee that the energy of each click cry pulse is greater than the energy threshold E of settingd=0.7,
Permutation and combination is carried out to this 5 click cry pulses and is further separated into 4 groups of click cry trains of pulse, includes in every group
Click calls train of pulse numberEach click cry train of pulse includes in corresponding every group
It is 2,3,4,5 that click, which calls pulse number,.Delay inequality minimum value is set between two pulses as τmin=10ms, each click
It calls the time interval T between train of pulse and is greater than delay inequality τ between click cry train of pulsedMaximum value, i.e. τdmax=2N2·
τmin=40ms, takes T=50ms.Therefore it for coding binary information " 0000 ", needs to choose and calls pulse comprising 2 click
Train of pulse, and k=1, τd=10ms；Coding binary information " 0001 " needs to choose and calls pulse comprising 2 click
Train of pulse, and k=2, τd=20ms；......；Coding binary information " 0100 " needs to choose and calls arteries and veins comprising 3 click
The train of pulse of punching, and k=1, τd=10ms；Coding binary information " 0101 " needs to choose and calls pulse comprising 3 click
Train of pulse, and k=2, τd=20ms；......；Coding binary information " 1111 " needs to choose comprising 5 click crys
The train of pulse of pulse, and k=4, τd=40ms.
Further, if Fig. 4 is to call the communication that pulse generates using the original click of whale/dolphin according to examples detailed above
Information waveform, figure label 1-4 respectively indicate the serial number of 4 click cry trains of pulse, and it includes 2 that click, which calls train of pulse 15,
Click calls train of pulse, delay inequality τd=20ms represents coding binary information " 0001 "；Click calls train of pulse 16 and wraps
Train of pulse, delay inequality τ are called containing 3 clickd=10ms represents coding binary information " 0100 "；Click calls pulse
String 17 calls train of pulse, delay inequality τ comprising 4 clickd=40ms represents coding binary information " 0111 "；Click is cried
Ping string 18 includes that 5 click call train of pulse, delay inequality τd=30ms represents coding binary information " 1110 ".Often
Time interval is T=50ms between a train of pulse.
Second step, the coding/decoding method for designing communication receiver
The short-time energy spectrum that the signal received is normalized is calculated in communication receiver, passes through one conjunction of setting
Suitable threshold value TV goes to detect and position position and time duration of each click cry pulse in received signal, from
And obtain the delay inequality τ between each click cry pulsed, while according between the time between each click cry train of pulse
It is greater than delay inequality τ between click cry pulse every TdMaximum value τdmax, extract each click cry train of pulse.Further
Ground obtains the click for including in each click cry train of pulse according to the result that normalization short-time energy spectrum calculates and calls pulse
Quantity calls the delay inequality τ between pulse according to click on this basisdτ should be metd=k τmin, decode the communication information.
Specifically, if calling the train of pulse of pulse in click cry train of pulse comprising 2 click, and k=1, then lead to
Crossing the communication binary message that click cry train of pulse decodes isIf being wrapped in click cry train of pulse
Train of pulse containing 3 click cry pulses, and k=2 are then called the communication binary system that train of pulse decodes by the click and are believed
Breath isIf click calls the train of pulse comprising 5 click cry pulses in train of pulse, and
K=3, then calling the communication binary message that train of pulse decodes by the click is
Further, corresponding with the specific example in communication code method of the embodiment of the present invention, it is known that between two pulses
Delay inequality minimum value is τmin=10ms obtains click to call in train of pulse including that 2 click call pulses when by demodulating,
And k=1, τdWhen=10ms, the communication binary message decoded is " 0000 "；Pulse is called when obtaining click by demodulation
Pulse, and k=2, τ are called comprising 2 click in stringdWhen=20ms, the communication binary message decoded is
"0001"；......；It obtains click to call in train of pulse including that 3 click call pulses, and k=1, τ when by demodulatingd=
When 10ms, the communication binary message decoded is " 0100 "；It calls in train of pulse when obtaining click by demodulation comprising 3
Click calls pulse, and k=2, τdWhen=20ms, the communication binary message decoded is " 0101 "；......；When passing through
Demodulation obtains calling pulse, and k=4, τ comprising 5 click in click cry train of pulsedWhen=40ms, the communication that decodes
Binary message is " 1111 ".
Third step, communication emit and the realization of receiving platform
Communication flat pad is accomplished by
As shown in Fig. 2, calling train of pulse 1 to the P group click that permutation and combination obtains is carried out by P+1 click cry pulse
Click pulse signal library 2 is established, and is stored it in click cry pulse accumulator 3, such as storage card (Secure
Digital Memory Card, abbreviation SD card) or synchronous DRAM (Synchronous Dynamic Random
Access Memory, abbreviation SDRAM).According to mission requirements, (pass through when needing to encode the information of N=N1+N2bits
Click calls number of pulses difference and encodes N1bit information, calls the pattern time-delay coding N2bit between pulse by click and believes
Breath), M=2 is chosen from click pulse signal library 2N1(M <=P) organizes click and calls train of pulse, includes in m groupIt is a
Click calls train of pulse, is ranked up according to the size comprising number of pulses, encodes N1bit information.
Simultaneously according to the N2bit information to be encoded, the delay inequality τ between click cry pulse is calculatedd, pass through communications codes
Time interval T (T > τ of the elementary time interval setter 4 to click cry train of pulsedmax) be configured.Led to according to be sent
Letter information 5,6 pairs of the communications encoder M group click cry trains of pulse for representing Nbit information and click cry impulse time delay difference τd
It is encoded, while the time interval T set to communication symbol interval setter 4 is identified, is called to adjacent click
Time interval between train of pulse is configured, and the communication information after coding is converted into acoustic signals by underwater acoustic transducer 7
It sends.
Communications reception platform is accomplished by
As shown in figure 3, calling pulse to the click for carrying the communication information that underwater acoustic transducer 7 emits using hydrophone 9
Waveform is acquired, and the acoustic signals received are converted to electric signal by hydrophone 9, is transferred to short-time energy spectrum calculator 10,
The short-time energy spectrum that the signal received is normalized is calculated, detects and positions each click cry pulse and received
Position and time duration in signal, then click calls train of pulse identifier 11 and sets according in communication code method
Adjacent click cry train of pulse between time interval T > τdmaxPrinciple, identification extracts each click cry pulse
String, and it is sent to communication decoder 12, demodulate the click cry train of pulse quantity m that each click cry train of pulse includes
And the delay inequality τ between click cry pulsed, so that the communication information is decoded, it is defeated finally by communication information follower 13
Out, the decoding of the communication information is realized.
The embodiment of the present invention to the model of each device in addition to doing specified otherwise, the model of other devices with no restrictions,
As long as the device of above-mentioned function can be completed.
It will be appreciated by those skilled in the art that attached drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention
Serial number is for illustration only, does not represent the advantages or disadvantages of the embodiments.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of communication means for carrying out encoding and decoding using whale/dolphin click cry quantity variance, which is characterized in that the side
Method includes:
The short-time energy spectrum that the signal received is normalized is calculated in communication receiver, is composed according to short-time energy and calculates knot
Fruit obtains the click cry number of pulses for including in each click cry train of pulse, according to click call between pulse when
The preset condition for prolonging difference satisfaction, decodes the communication information；
It communicates the realization of flat pad: train of pulse being called to the M group click for representing Nbit information and click calls impulse time delay
Poor τdIt is encoded, the time interval of communication symbol interval setter setting is identified, arteries and veins is called to adjacent click
Time interval between punching string is configured, and the communication information after coding is converted into acoustic signals hair by underwater acoustic transducer
It send；
The realization of communications reception platform: the short-time energy spectrum that the acoustic signals received are normalized is calculated, is detected and fixed
Position and time duration of each click cry pulse in position in received signal, click call train of pulse identifier root
According to the time interval T > τ between the adjacent click cry train of pulse set in communication codedmaxPrinciple, identification extracts every
A click calls train of pulse, and is sent to communication decoder, demodulates the click that each click cry train of pulse includes and cries
Ping string number m and click call the delay inequality between pulse, decode the communication information.
2. a kind of communication party for carrying out encoding and decoding using whale/dolphin click cry quantity variance according to claim 1
Method, which is characterized in that the method also includes: communication code is designed according to whale/dolphin cry feature and sounding rule.
3. a kind of communication party for carrying out encoding and decoding using whale/dolphin click cry quantity variance according to claim 2
Method, which is characterized in that described that communication code is designed according to whale/dolphin cry feature and sounding rule specifically:
Gain adjustment and normalized energy are carried out to M+1 click cry pulse, guarantee the energy of each click cry pulse
Greater than the energy threshold E of settingd；
M+1 click cry pulse is divided into M group click cry train of pulse, is arranged in every group and includes at least 2 click cry arteries and veins
Punching,
M group click calls the binary data of pulse string encoding N1 bit, according to the population size containing click cry pulse
Carry out sequential encoding；
According to the time interval rule τ between the original click cry pulse of whale/dolphind, setting delay inequality minimum value is τmin。
4. a kind of communication party for carrying out encoding and decoding using whale/dolphin click cry quantity variance according to claim 1
Method, which is characterized in that the Nbit information specifically:
M group click is chosen from click pulse signal library and calls train of pulse, is ranked up according to the size comprising number of pulses,
Encode N1bit information；
According to N2bit information, the delay inequality between click cry pulse is calculated, by communicating symbol interval setter pair
The time interval T of click cry train of pulse is configured.
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Application publication date: 20191115 |