CN106842173A - Dispersion extracting method, apparatus and system - Google Patents
Dispersion extracting method, apparatus and system Download PDFInfo
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- CN106842173A CN106842173A CN201710114309.7A CN201710114309A CN106842173A CN 106842173 A CN106842173 A CN 106842173A CN 201710114309 A CN201710114309 A CN 201710114309A CN 106842173 A CN106842173 A CN 106842173A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/539—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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Abstract
A kind of Dispersion extracting method, apparatus and system are the embodiment of the invention provides, methods described includes：Reception is arranged at multiple underwater sound signals of at least one receiving hydrophone collection under water；Build the signal matrix comprising multiple underwater sound signals；To in signal matrix not in the same time, the underwater sound signal of same position point be converted into frequency domain from time-domain；Also, in signal matrix mutually in the same time, the underwater sound signal of diverse location point is from space field transformation to wave-number domain；The frequency wave number coordinate system on frequency domain and wave-number domain is set up, the maximum point in a coordinate system of the signal matrix after conversion is extracted；According to maximum point, coordinate position on frequency wave number coordinate system calculates the underwater spread speed of each frequency component of underwater sound signal, and then obtains Dispersion Characteristics of the underwater sound signal under water in communication process.The present invention can be near field measurement apart from the interior separation realized to multistage normal mode, extraction, it is easier to the utilization to Dispersion in the marine environment of shallow sea.
Description
Technical field
The present invention relates to ocean acoustic field modeling technique field, more particularly to a kind of Dispersion extracting method, device and it is
System.
Background technology
With the raising of mankind's Ocean Awareness, exploration, research ocean have become one of topic most popular at present.Due to
Sound wave is the currently the only energy forms of radiation for being known to and being propagated in ocean medium and long distance, therefore research acoustic signals are in ocean
In propagation law, and then be applied to Underwater Target Detection, Underwater Targets Recognition, underwater communication, marine environmental monitoring etc.
Practical Project field has been known as the basic research content of modern age underwater acoustic technology.
Due to shallow water effect, acoustical signal can produce obvious frequency dispersion to show when especially low-frequency acoustic signal is propagated under water
As, broadening, overlap of the intrinsic wave number of normal mode with frequency change and pulse signal are mainly shown as, these characteristics are to a certain degree
On constrain the development and application of underwater acoustic technology.Researcher begins attempt to front and utilizes Dispersion in recent ten years, and
It is successfully applied in the acquisition to neritic environment parameter and the passive estimation to submarine target.
In the research of application shallow sea Dispersion, the dispersion curve for how accurately extracting not jack per line normal mode is to analyze this
The key of one problem.When being utilized traditional extraction to shallow sea normal wave dispersion curve more-frequency analysis method, such as Fourier becomes in short-term
(STFT), Wigner-Ville distribution, adaptive optimal kernel time-frequency distributions etc. are changed, signal is in different time, difference through discussion
The strong and weak Dispersion Characteristics analyzed in its communication process of energy at frequency.But when above-mentioned-frequency analysis method is required to far-field measurement
Condition, when sound source and receiving point spacing are nearer, when above-mentioned-frequency analysis method be difficult accurately to differentiate multistage normal mode frequency dispersion it is special
Levy.
The content of the invention
To overcome problem present in correlation technique, the present invention to provide a kind of Dispersion extracting method, apparatus and system,
During solving sound source and nearer receiving point spacing, multistage normal mode Dispersion differentiates inaccurate problem.
A kind of first aspect according to embodiments of the present invention, there is provided Dispersion extracting method, including：
Reception is arranged at multiple underwater sound signals of at least one receiving hydrophone collection under water, when the receiving hydrophone
For at least two when, at least two receiving hydrophone levels, lay by array way at equal intervals；When the receiving hydrophone is one
When individual, multiple underwater sound signals are that the receiving hydrophone is received on different location points and obtained, two institutes of arbitrary neighborhood
State location point be by the distance between the receiving hydrophone and described transmitting transducer be not in the same time along straight line at equal intervals
What change was obtained；
Build the signal matrix comprising multiple underwater sound signals；
To in the signal matrix not in the same time, the underwater sound signal of same position point be converted into frequency domain from time-domain；And
And, in the signal matrix mutually in the same time, the underwater sound signal of diverse location point is from space field transformation to wave-number domain；
The frequency-wavenumber coordinate system on the frequency domain and the wave-number domain is set up, the signal after conversion is extracted
Maximum point of the matrix in the coordinate system；
Coordinate position according to the maximum point on frequency-wavenumber coordinate system calculates each frequency point of underwater sound signal
Measure underwater spread speed, and then obtain Dispersion Characteristics of the underwater sound signal under water in communication process.
Alternatively, it is described in the signal matrix not in the same time, the underwater sound signal of same position point converts from time-domain
To frequency domain, including：
To in the signal matrix not in the same time, the underwater sound signal of same position point be utilized respectively fourier transform algorithm from
Time-domain is converted into frequency domain, obtains the frequency spectrum of underwater sound signal in the signal matrix.
Alternatively, it is described in the signal matrix mutually in the same time, the underwater sound signal of diverse location point is from spatial domain
Wave-number domain is converted into, including：
To in the signal matrix mutually in the same time, the corresponding frequency spectrum of the underwater sound signal of diverse location point be utilized respectively Fu
Vertical leaf transformation algorithm obtains the wave-number spectrum of underwater sound signal in signal matrix from space field transformation to wave-number domain.
Alternatively, the horizontal range between the two neighboring location point is less than or equal to preset wavelength, the preset wavelength
It is the half of the corresponding minimum wavelength of the transmitted bandwidth of the underwater sound signal.
According to the second aspect of the embodiment of the present disclosure, there is provided it is a kind of can under the conditions of pond using this extracting method extraction
Device, including：
Receiver module, multiple underwater sound signals of at least one receiving hydrophone collection under water are arranged at for receiving, when
When the receiving hydrophone is at least two, at least two receiving hydrophone levels, lay by array way at equal intervals；When described
When receiving hydrophone is one, multiple underwater sound signals are that the receiving hydrophone is received on different location points and obtained, times
It by the distance between the receiving hydrophone and described transmitting transducer is when different that adjacent two location points of meaning are
Quarter changes what is obtained along straight line at equal intervals；
Module is built, for building the signal matrix comprising multiple underwater sound signals；
Conversion module, in the signal matrix not in the same time, the underwater sound signal of same position point becomes from time-domain
Shift to frequency domain；Also, in the signal matrix mutually in the same time, the underwater sound signal of diverse location point is from space field transformation
To wave-number domain；
Extraction module is set up, for setting up the frequency-wavenumber coordinate system on the frequency domain and the wave-number domain, is extracted
The maximum point of the signal matrix after conversion in the coordinate system；
Computing module, the coordinate position according to the maximum point on frequency-wavenumber coordinate system calculates underwater sound signal
The underwater spread speed of each frequency component, and then obtain Dispersion Characteristics of the underwater sound signal under water in communication process.
Alternatively, the conversion module, is additionally operable to：
To in the signal matrix not in the same time, the underwater sound signal of same position point be utilized respectively fourier transform algorithm from
Time-domain is converted into frequency domain, obtains the frequency spectrum of underwater sound signal in the signal matrix.
Alternatively, the conversion module, is additionally operable to：
To in the signal matrix mutually in the same time, the corresponding frequency spectrum of the underwater sound signal of diverse location point be utilized respectively Fu
Vertical leaf transformation algorithm obtains the wave-number spectrum of underwater sound signal in signal matrix from space field transformation to wave-number domain.
Alternatively, the horizontal range between the two neighboring location point is less than or equal to preset wavelength, the preset wavelength
It is the half of the corresponding minimum wavelength of the transmitted bandwidth of the underwater sound signal.
According to the third aspect of the embodiment of the present disclosure, there is provided it is a kind of make that this extracting method applies under the conditions of pond be
System, including：The processor of the Dispersion extracting method provided for the first aspect performed such as the embodiment of the present disclosure and movement
Platform, and, it is arranged at transmitting transducer inside pond, receiving hydrophone, seabed analog board and fixed support；
The mobile platform is arranged at the pond top, and the transmitting transducer is fixed on the mobile platform, institute
State receiving hydrophone to be slidably connected with the mobile platform, the receiving hydrophone is used to receive the underwater sound on different location points
Signal, two location points of arbitrary neighborhood are not by the distance between the receiving hydrophone and described transmitting transducer
In the same time at equal intervals, level change obtains；
The seabed analog board is arranged at the fixed support top, and the fixed support is consolidated with the bottom in the pond
It is fixed；
The processor is used to receive the multiple underwater sound signals for being arranged at least one receiving hydrophone collection under water, when
When the receiving hydrophone is at least two, at least two receiving hydrophone levels, lay by array way at equal intervals；When described
When receiving hydrophone is one, multiple underwater sound signals are that the receiving hydrophone is received on different location points and obtained, times
It by the distance between the receiving hydrophone and described transmitting transducer is when different that adjacent two location points of meaning are
Quarter changes what is obtained along straight line at equal intervals；Build the signal matrix comprising multiple underwater sound signals；To in the signal matrix
Not in the same time, the underwater sound signal of same position point be converted into frequency domain from time-domain；Also, to it is identical in the signal matrix when
Quarter, the underwater sound signal of diverse location point are from space field transformation to wave-number domain；Set up on the frequency domain and the wave number
The frequency-wavenumber coordinate system in domain, extracts maximum point of the signal matrix after conversion in the coordinate system；According to described
Coordinate position of the maximum point on frequency-wavenumber coordinate system calculates the underwater propagation speed of each frequency component of underwater sound signal
Degree, and then obtain Dispersion Characteristics of the underwater sound signal under water in communication process.
The technical scheme that embodiments of the invention are provided can include the following benefits：
The present invention receives the sound in upper multiple tracks water of horizontal transmission at equal intervals and passes by horizontal array (or dummy level battle array)
Signal is broadcast, the signal matrix comprising multiple underwater sound signals that will be received using two-dimensional Fourier transform is from temporal-spatial field coordinate
System, is transformed into frequency wavenumber domain for coordinate system, by finding maximum point on frequency wavenumber domain, is capable of achieving the docking collection of letters number
Included in waveguide Dispersion extraction.Overcoming it cannot separate the shortcoming of multistage normal wave dispersion curve near field,
Can be near field measurement apart from the interior separation realized to multistage normal mode, extraction.It is easier to Dispersion in the marine environment of shallow sea
Utilization.
It should be appreciated that the general description of the above and detailed description hereinafter are only exemplary and explanatory, not
Can the limitation present invention.
Brief description of the drawings
Accompanying drawing herein is merged in specification and constitutes the part of this specification, shows and meets implementation of the invention
Example, and be used to explain principle of the invention together with specification.
Fig. 1 is a kind of flow chart of the Dispersion extracting method according to an exemplary embodiment；
Fig. 2 is the schematic diagram of sonic pressure field in the marine environment water of shallow sea in the embodiment of the present invention；
Fig. 3 is a kind of structure chart of the Dispersion extraction element according to an exemplary embodiment；
Fig. 4 is the structural representation of the pond Dispersion extraction system shown in an exemplary embodiment of the invention；
Fig. 5 is the spectrum diagram of the transmission signal shown in an exemplary embodiment of the invention；
Fig. 6 is the spectrum diagram of the signal matrix shown in an exemplary embodiment of the invention；
Fig. 7 is the underwater sound signal conversion schematic diagram shown in an exemplary embodiment of the invention；
Fig. 8 is that an exemplary embodiment of the invention shows to process the result after Fig. 6 data using the feature extraction method of product three
Schematic diagram.
Specific embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in implementation method do not represent and the consistent all implementation methods of the present invention.Conversely, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects being described in detail in claims, of the invention.
As shown in figure 1, the embodiment of the present invention provides a kind of Dispersion extracting method, comprise the following steps.
In step S101, reception is arranged at multiple underwater sound signals of at least one receiving hydrophone collection under water.
In embodiments of the present invention, when the receiving hydrophone is at least two, at least two receiving hydrophone levels,
Laid by array way at equal intervals；When the receiving hydrophone is one, multiple underwater sound signals are the receiving hydrophone
Received on different location points and obtained, two location points of arbitrary neighborhood are by the receiving hydrophone and the transmitting
The distance between transducer is obtained not changing at equal intervals along straight line in the same time, for example, receiving hydrophone edge can be controlled
Horizontal direction at the uniform velocity to move, when arriving at the odd number moment, receiving hydrophone is sent to underwater sound signal, it is to be understood that receive
The time of reception of underwater sound signal can set according to actual needs, not limited in the embodiment of the present invention, two neighboring institute's rheme
Horizontal range between putting a little is less than or equal to preset wavelength, and the preset wavelength is that the transmitted bandwidth of the underwater sound signal is corresponding
The half of minimum wavelength.
Typical shallow sea Pekeris waveguide marine environment as shown in Figure 2, the acoustic pressure of coordinate position (r, z) under water in time domain
Field p (r, z, t) is represented by：
Wherein, E (ξ, ω)=β1cosβ1H-ibβpK sinβ1H；
k1=ω/c1、kp=ω/cp、ks=ω/cs, b=ρ1/ρb, corresponding waveguide dispersion equation in Fig. 1 models is during E (ξ)=0；
km=ω/cm, m=1, p, s, c1、cpAnd csThe velocity of sound, seabed longitudinal wave velocity and seabed transverse wave velocity in water respectively in model；
ρ1、ρbWater Midst density and seafloor density respectively in model；ω=2 π f are angular frequency, and f is frequency of source；z、zsTo receive water
Listen that device lays depth and transmitting transducer lays depth；R is level interval between underwater emission transducer and receiving hydrophone；H is
Seabed depth；ξ is horizontal wave number；H0 (1)、H0 (2)The class Hankel functions of 0 rank the 1st and the class Hankel functions of 0 rank the 2nd are represented respectively.
In step s 102, the signal matrix comprising multiple underwater sound signals is built.
In step s 103, in the signal matrix not in the same time, the underwater sound signal of same position point becomes from time-domain
Shift to frequency domain；Also, in the signal matrix mutually in the same time, the underwater sound signal of diverse location point is from space field transformation
To wave-number domain.
In embodiments of the present invention, by Fourier transformation, can be by formula (1) on time domain T, receiving point (r, z) place under water
Sound field expression formula p (r, z, t) be transformed on frequency domain F, sound field expression formula p (r, z, ω) at receiving point (r, z) place under water, can be with
For：
From the expression formula of (2) formula it can be seen that, to not in the same time, single receiving point (r, z) place receive the underwater sound letter
Number Fourier transform is carried out, that is, realize that signal, from time-domain T to the conversion of frequency domain F, can obtain each frequency spectrum for receiving signal.
In this step, in the signal matrix not in the same time, the underwater sound signal of same position point be utilized respectively Fourier
Leaf transformation algorithm is transformed to frequency domain from time-domain, obtains the frequency spectrum of underwater sound signal in the signal matrix.
Also, using formula (3) in the signal matrix mutually in the same time, the underwater sound signal of diverse location point is from sky
Between domain be converted into wave-number domain, obtain the wave-number spectrum of underwater sound signal in signal matrix.
In embodiments of the present invention, using two groups of Fourier transforms, be capable of achieving acoustical signal from temporal-spatial field to frequency-
The conversion of wave-number domain：
In step S104, the frequency-wavenumber coordinate system on the frequency domain and the wave-number domain is set up, extract conversion
Maximum point of the signal matrix afterwards in the coordinate system.
In embodiments of the present invention, in frequency wavenumber domain, the maximum point of sound field is in denominator term E (ξ, ω)=0
Place, that is, correspond to the root of dispersion equation.
In step S105, the coordinate position according to the maximum point on frequency-wavenumber coordinate system calculates underwater sound letter
Number the underwater spread speed of each frequency component, and then it is special to obtain frequency dispersion of the underwater sound signal under water in communication process
Levy.
In embodiments of the present invention, according to normal mode theory, when waveguide environmental parameter determination, each frequency acoustical signal is at it
In spread speed can be obtained by the solution to dispersion equation, you can obtain acoustic signal propagation during Dispersion Characteristics.And
In frequency wavenumber domain, acoustical signal frequency dispersion in the air then can actually be obtained by the extraction to maximum point on its two-dimensional field
Feature.
As shown in figure 3, in another embodiment of the present invention, there is provided a kind of Dispersion extraction element, including：Receive mould
Block 11, build module 12, conversion module 13, set up extraction module 14 and computing module 15.
Receiver module 11, multiple underwater sound signals of at least one receiving hydrophone collection under water are arranged at for receiving,
When the receiving hydrophone is at least two, at least two receiving hydrophone levels, lay by array way at equal intervals；Work as institute
State receiving hydrophone for one when, multiple underwater sound signals are that the receiving hydrophone is received on different location points and obtained,
It by the distance between the receiving hydrophone and described transmitting transducer is in difference that two location points of arbitrary neighborhood are
Moment changes what is obtained along straight line at equal intervals；
Module 12 is built, for building the signal matrix comprising multiple underwater sound signals；
Conversion module 13, for in the signal matrix not in the same time, the underwater sound signal of same position point is from the time
Domain is converted into frequency domain；Also, in the signal matrix mutually in the same time, the underwater sound signal of diverse location point is from spatial domain
It is converted into wave-number domain；
The conversion module, is additionally operable to：
To in the signal matrix not in the same time, the underwater sound signal of same position point be utilized respectively fourier transform algorithm from
Time-domain is converted into frequency domain, obtains the frequency spectrum of underwater sound signal in the signal matrix.
The conversion module, is additionally operable to：
To in the signal matrix mutually in the same time, the corresponding frequency spectrum of the underwater sound signal of diverse location point be utilized respectively Fu
Vertical leaf transformation algorithm obtains the wave-number spectrum of underwater sound signal in signal matrix from space field transformation to wave-number domain.
Extraction module 14 is set up, for setting up the frequency-wavenumber coordinate system on the frequency domain and the wave-number domain, is carried
Take maximum point of the signal matrix after conversion in the coordinate system；
Computing module 15, the underwater sound is calculated for the coordinate position according to the maximum point on frequency-wavenumber coordinate system
The underwater spread speed of each frequency component of signal, and then obtain frequency dispersion of the underwater sound signal under water in communication process
Feature.
Above method embodiment can apply in the Dispersion extraction system of pond as shown in Figure 4, the system bag
Include：Processor 7, mobile platform 6, pond 3, and, it is arranged at transmitting transducer 5, receiving hydrophone 4, seabed inside pond 3
Analog board 1 and fixed support 2；
The mobile platform 6 is arranged at the top of the pond 3, and the transmitting transducer 5 is fixed on the mobile platform 6
On, the receiving hydrophone 4 is slidably connected with the mobile platform 6, and the receiving hydrophone 4 is used in different location points
Receive underwater sound signal, two location points of arbitrary neighborhood be by the water listen between 4 devices and the transmitting transducer 5 away from
From not in the same time at equal intervals, level change obtains；
The seabed analog board 1 is arranged at the top of the fixed support 2, the bottom in the fixed support 2 and the pond 4
It is fixed；
The processor 7 is used to receive the multiple underwater sound signals for being arranged at least one receiving hydrophone collection under water,
When the receiving hydrophone is at least two, at least two receiving hydrophone levels, lay by array way at equal intervals；Work as institute
State receiving hydrophone for one when, multiple underwater sound signals are that the receiving hydrophone is received on different location points and obtained,
It by the distance between the receiving hydrophone and described transmitting transducer is in difference that two location points of arbitrary neighborhood are
Moment changes what is obtained along straight line at equal intervals；Build the signal matrix comprising multiple underwater sound signals；To the signal matrix
In not in the same time, the underwater sound signal of same position point be converted into frequency domain from time-domain；Also, to identical in the signal matrix
Moment, the underwater sound signal of diverse location point are from space field transformation to wave-number domain；Set up on the frequency domain and the ripple
The frequency-wavenumber coordinate system of number field, extracts maximum point of the signal matrix after conversion in the coordinate system；According to institute
State the underwater propagation of each frequency component that coordinate position of the maximum point on frequency-wavenumber coordinate system calculates underwater sound signal
Speed, and then obtain Dispersion Characteristics of the underwater sound signal under water in communication process.
In actual applications, typical shallow sea marine environment shown in simulation drawing 2, measuring apparatus lay figure as shown in figure 4, measurement
When, using one piece of simulated sea bottom of PVC board 1 and it is positioned on the fixed support 2 in pond 3.Wideband high-frequency transmitting transducer 5 and reception
Hydrophone 4 is fixed on the top of PVC board 1 with support.Wideband high-frequency transmitting transducer 5 and receiving hydrophone are kept in measurement process
4 to lay depth constant.
Holding wideband high-frequency transmitting transducer 5 is motionless in measurement process, and the level of receiving hydrophone 4 is at equal intervals to away from sound source
(as shown in Figure 4) is moved in direction, because transmission signal (as shown in Figure 5) centre frequency is located near 155kHz in experiment, bandwidth
It is 130kHz-180kHz, minimum wavelength is about 8mm in signal bandwidth, receiving hydrophone 4 is set in experiment and completes a receiving position
2mm to next receiving point is moved horizontally to away from sound source position every time after measurement, by the control realization of mobile platform 6.
With between high-frequency emission transducer 5 and receiving hydrophone 4, distance is continually changing at equal intervals, and many channel receiving signals can
It is modeled as a horizontal signal matrix (as shown in Figure 6).After signal matrix is obtained, to not in the same time, at same receiving position
The underwater sound signal for receiving carries out Fourier transform, that is, realize that signal, from time-domain T to the conversion of frequency domain F, can obtain each
Receive the frequency spectrum of signal；Underwater sound signal to being received at different receiving positions at equal intervals in synchronization, horizontal direction is carried out
Fourier transform, is capable of achieving signal from spatial domain R to the conversion of wave-number domain K；Using two groups of Fourier transforms, acoustical signal is capable of achieving
Conversion (as shown in Figure 7) from temporal-spatial field to frequency wavenumber domain.
Fig. 8 gives and processes the result after Fig. 6 data using the inventive method, and black line is Binding experiment ambient parameter in figure
Distribution characteristics under the experimental situation being calculated on each rank normal mode theory dispersion curve morning frequency wavenumber domain.Can from figure
To see, actual measurement dispersion curve and the calculated results coincide preferable, it was demonstrated that the inventive method is each near field fluid is extracted
Validity and feasibility during rank normal wave dispersion curve.
Those skilled in the art considering specification and after putting into practice invention disclosed herein, will readily occur to it is of the invention its
Its embodiment.The application is intended to any modification of the invention, purposes or adaptations, these modifications, purposes or
Person's adaptations follow general principle of the invention and including undocumented common knowledge in the art of the invention
Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by appended
Claim is pointed out.
It should be appreciated that the invention is not limited in the precision architecture being described above and be shown in the drawings, and
And can without departing from the scope carry out various modifications and changes.The scope of the present invention is only limited by appended claim.
Claims (9)
1. a kind of Dispersion extracting method, it is characterised in that including：
Reception be arranged under water at least one receiving hydrophone collection multiple underwater sound signals, when the receiving hydrophone be to
When few two, at least two receiving hydrophone levels, lay by array way at equal intervals；When the receiving hydrophone is one
When, multiple underwater sound signals are that the receiving hydrophone is received on different location points and obtained, described in two of arbitrary neighborhood
It by the distance between the receiving hydrophone and described transmitting transducer is not become at equal intervals along straight line in the same time that location point is
What change was obtained；
Build the signal matrix comprising multiple underwater sound signals；
To in the signal matrix not in the same time, the underwater sound signal of same position point be converted into frequency domain from time-domain；Also, it is right
In the signal matrix mutually in the same time, the underwater sound signal of diverse location point is from space field transformation to wave-number domain；
The frequency-wavenumber coordinate system on the frequency domain and the wave-number domain is set up, the signal matrix after conversion is extracted
Maximum point in the coordinate system；
Each frequency component that coordinate position according to the maximum point on frequency-wavenumber coordinate system calculates underwater sound signal exists
Spread speed under water, and then obtain Dispersion Characteristics of the underwater sound signal under water in communication process.
2. method according to claim 1, it is characterised in that it is described in the signal matrix not in the same time, identical bits
The underwater sound signal put a little is converted into frequency domain from time-domain, including：
To in the signal matrix not in the same time, the underwater sound signal of same position point be utilized respectively fourier transform algorithm from time
Domain is converted into frequency domain, obtains the frequency spectrum of underwater sound signal in the signal matrix.
3. method according to claim 1, it is characterised in that it is described in the signal matrix mutually in the same time, different positions
The underwater sound signal a little is put from space field transformation to wave-number domain, including：
To in the signal matrix mutually in the same time, the corresponding frequency spectrum of the underwater sound signal of diverse location point be utilized respectively Fourier
Become scaling method from space field transformation to wave-number domain, obtain the wave-number spectrum of underwater sound signal in signal matrix.
4. method according to claim 1, it is characterised in that the horizontal range between the two neighboring location point is less than
Equal to preset wavelength, the preset wavelength is the half of the corresponding minimum wavelength of transmitted bandwidth of the underwater sound signal.
5. a kind of Dispersion extraction element, it is characterised in that including：
Receiver module, multiple underwater sound signals of at least one receiving hydrophone collection under water is arranged at for receiving, when described
When receiving hydrophone is at least two, at least two receiving hydrophone levels, lay by array way at equal intervals；When the reception
When hydrophone is one, multiple underwater sound signals are that the receiving hydrophone is received on different location points and obtained, any phase
It by the distance between the receiving hydrophone and described transmitting transducer is on not edge in the same time that two adjacent location points are
Straight line changes what is obtained at equal intervals；
Module is built, for building the signal matrix comprising multiple underwater sound signals；
Conversion module, in the signal matrix not in the same time, the underwater sound signal of same position point is converted into from time-domain
Frequency domain；Also, in the signal matrix mutually in the same time, the underwater sound signal of diverse location point is from space field transformation to ripple
Number field；
Extraction module is set up, for setting up the frequency-wavenumber coordinate system on the frequency domain and the wave-number domain, conversion is extracted
Maximum point of the signal matrix afterwards in the coordinate system；
Computing module, the coordinate position according to the maximum point on frequency-wavenumber coordinate system calculates each of underwater sound signal
The underwater spread speed of frequency component, and then obtain Dispersion Characteristics of the underwater sound signal under water in communication process.
6. device according to claim 5, it is characterised in that the conversion module, is additionally operable to：
To in the signal matrix not in the same time, the underwater sound signal of same position point be utilized respectively fourier transform algorithm from time
Domain is converted into frequency domain, obtains the frequency spectrum of underwater sound signal in the signal matrix.
7. device according to claim 5, it is characterised in that the conversion module, is additionally operable to：
To in the signal matrix mutually in the same time, the corresponding frequency spectrum of the underwater sound signal of diverse location point be utilized respectively Fourier
Become scaling method from space field transformation to wave-number domain, obtain the wave-number spectrum of underwater sound signal in signal matrix.
8. device according to claim 5, it is characterised in that the horizontal range between the two neighboring location point is less than
Equal to preset wavelength, the preset wavelength is the half of the corresponding minimum wavelength of transmitted bandwidth of the underwater sound signal.
9. a kind of Dispersion extraction system, it is characterised in that including：For the perform claim requirement 1 under the conditions of tank experiments
The processor and mobile platform of the Dispersion extracting method described in 4 any one, and, it is arranged at the transmitting inside pond
Transducer, receiving hydrophone, seabed analog board and fixed support；
The mobile platform is arranged at the pond top, and the transmitting transducer is fixed on the mobile platform, described to connect
Receive hydrophone to be slidably connected with the mobile platform, the receiving hydrophone is used to receive underwater sound letter on different location points
Number, two location points of arbitrary neighborhood are in difference by the distance between the receiving hydrophone and described transmitting transducer
Moment is at equal intervals, level change obtains；
The seabed analog board is arranged at the fixed support top, and the fixed support is fixed with the bottom in the pond；
The processor is used to receive the multiple underwater sound signals for being arranged at least one receiving hydrophone collection under water, when described
When receiving hydrophone is at least two, at least two receiving hydrophone levels, lay by array way at equal intervals；When the reception
When hydrophone is one, multiple underwater sound signals are that the receiving hydrophone is received on different location points and obtained, any phase
It by the distance between the receiving hydrophone and described transmitting transducer is on not edge in the same time that two adjacent location points are
Straight line changes what is obtained at equal intervals；Build the signal matrix comprising multiple underwater sound signals；To different in the signal matrix
Moment, the underwater sound signal of same position point are converted into frequency domain from time-domain；Also, in the signal matrix mutually in the same time,
The underwater sound signal of diverse location point is from space field transformation to wave-number domain；Set up on the frequency domain and the wave-number domain
Frequency-wavenumber coordinate system, extracts maximum point of the signal matrix after conversion in the coordinate system；According to described very big
Coordinate position of the value point on frequency-wavenumber coordinate system calculates the underwater spread speed of each frequency component of underwater sound signal,
And then obtain Dispersion Characteristics of the underwater sound signal under water in communication process.
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| CN109815942A (en) * | 2019-03-18 | 2019-05-28 | 西北工业大学 | Normal mode feature extracting method based on ambient sea noise signal |
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| CN112399302A (en) * | 2020-11-25 | 2021-02-23 | 维沃移动通信有限公司 | Audio playing method and device of wearable audio playing device |
| CN113126068A (en) * | 2021-04-22 | 2021-07-16 | 浙江大学 | Underwater vehicle self-noise suppression method based on wave number domain filtering |
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