CN109696238A - Underwater sound passive material insertion loss method for automatic measurement applied to pressure noise elimination water pot - Google Patents
Underwater sound passive material insertion loss method for automatic measurement applied to pressure noise elimination water pot Download PDFInfo
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- CN109696238A CN109696238A CN201811465262.XA CN201811465262A CN109696238A CN 109696238 A CN109696238 A CN 109696238A CN 201811465262 A CN201811465262 A CN 201811465262A CN 109696238 A CN109696238 A CN 109696238A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/16—Matrix or vector computation, e.g. matrix-matrix or matrix-vector multiplication, matrix factorization
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/17—Function evaluation by approximation methods, e.g. inter- or extrapolation, smoothing, least mean square method
Abstract
Underwater sound passive material insertion loss method for automatic measurement applied to pressure noise elimination water pot, it include: the connection and data communication with hardware system, it is modulated signal transmitting and setting signal triggers mode, modulation generates digital signal and exports to signal generator, digital signal is subjected to digital-to-analogue conversion, after carrying out impedance matching to power amplifier, by analog signal transmission to transmitting transducer battle array；The acquisition and demodulation of measurement data, digital signal is handled, channel response function is resolved based on least-squares algorithm, the Secondary Emission signal after optimization is resolved based on liftering Measurement Algorithm, is obtained based on multi-channel synchronous transmitting acquisition and calculates final signal data；Acquisition data are post-processed, the measurement result measured in measurement and data collection steps is calculated, obtain material insertion loss measurement result.Underwater sound passive material insertion loss method for automatic measurement provided by the invention applied to pressure noise elimination water pot, can be automatically performed the measurement work of material insertion loss.
Description
Technical field
The present invention relates to underwater sound passive material insertion loss fields of measurement, more particularly to one kind to be applied to pressure noise elimination water pot
Underwater sound passive material insertion loss method for automatic measurement.
Background technique
The increasingly promotion of demand, concern of the people to underwater structure are explored with ocean with the continuous development of science and technology
Gradually reinforce.The various aspects of performance of underwater structure material therefor also becomes everybody focus of attention.Wherein, the sound of these materials
It can be positioned by learning performance, and communication and other effects has an important influence on, and need to carry out the measurement of material underwater sound performance parameter, for drop
The material selection of the target strength of low underwater structure provides foundation.
At present the country material underwater sound performance parameter measurement, by taking insertion loss as an example, mainly have anechoic tank, test and
Sound pipe tests two kinds.Based on this, it was found by the inventors of the present invention that wherein there are certain lower frequency limits for anechoic tank, in lower limit
There can be serious effect of the interface below frequency, limit the frequency band of test.And anechoic tank, can not generally pressurize, Wu Famo
The acoustical behavior of material under pseudopressure environment.Sound pipe test can generally carry out pressurized operation, but there is also certain lower frequency limits
Rate.Moreover, the acoustic measurement of large scale sample can not be carried out under the conditions of sound pipe, can not response sample scale effect.In large size
Carry out test in pressure noise elimination water pot, the requirement of pressure and sample size can be combined, therefore increasingly paid close attention to by everybody.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention
In view of this, how the technical problem to be solved by the present invention is to provide a kind of water applied to pressure noise elimination water pot
Sound passive material insertion loss method for automatic measurement, the measurement for coping with increasingly increased underwater sound passive material insertion loss need
It asks, automatically obtains the insertion loss measured value of underwater sound passive material.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of passive material of the underwater sound applied to pressure noise elimination water pot
Expect insertion loss method for automatic measurement, comprising:
Hardware and parameter configuration step, for the connection and data communication with hardware system, be modulated signal transmitting and
Setting signal triggers mode, and modulation generates digital signal and exports to signal generator, will be described by the signal generator
Digital signal carries out digital-to-analogue conversion, and will convert resulting analog signal transmission to power amplifier, to the power amplifier
After carrying out impedance matching, the analog signal transmission is realized that the underwater acoustic measurement signal of particular form is sent out to transmitting transducer battle array
It penetrates；
Measurement and data collection steps, for the acquisition and demodulation of measurement data, at collected digital signal
Reason resolves channel response function based on least-squares algorithm, and the Secondary Emission letter after optimization is resolved based on liftering Measurement Algorithm
Number, acquisition is emitted based on multi-channel synchronous and obtains the final signal data of calculating；
Insertion loss calculates step, for post-processing to final acquisition data, obtains to measurement in step (2)
Measurement result is calculated, and underwater sound passive material insertion loss measured value is obtained；
Divide the two sides of column sample that will not place examination by the liftering Measurement Algorithm hydrophone and transmitting transducer
It is reference signal, frequency domain representation P in the default acquisition signal definition focused at hydrophone position when sampleiref(f)；
After sample being placed, the default liftering focus signal collected at hydrophone position that focuses is defined as sample
This signal is denoted as pt(t), frequency domain representation Pt(f), the reference signal and the sample signal are evened up in time-domain；Root
The measured value for obtaining sample insertion loss is calculated according to the reference signal and the sample are as follows:
In one possible implementation, the liftering Measurement Algorithm includes:
When generating single channel sky the step of liftering transmitting signal, for solving formula (1), inverse filter coefficient I is obtained
(0), (1) I ..., I (L) will obtain liftering transmitting letter when corresponding channel sky after the inverse filter coefficient normalized
Number；
When generating multichannel sky the step of liftering transmitting signal, liftering transmitting letter when the generation single channel sky is repeated
Number the step of, obtain when different channel skies liftering and emit signal, and using between the signal transmission time of each transmitting transducer
It is evened up every carrying out time delay to liftering signal, gained signal is denoted as sk(l), wherein l=1,2 ..., L, k=1,2 ..., K, K table
Show overall channel number.
In one possible implementation, the method further include:
Data save and report generation step, for the obtained underwater sound passive material insertion loss of measurement carry out storage and
Printout.
In order to solve the above technical problems, the embodiment of the invention also provides a kind of electronic equipment, comprising: at least one processing
Device；And the memory being connect at least one described processor communication；Wherein, the memory be stored with can by it is described at least
The instruction that one processor executes, described instruction is executed by least one described processor, so that at least one described processor
Method described in the above various aspects is executed, and realizes identical technical effect.
In order to solve the above technical problems, the embodiment of the invention also provides a kind of non-transient computer readable storage medium,
The non-transient computer readable storage medium is stored with computer executable instructions, and the computer executable instructions are for holding
Method described in the above various aspects of row, and realize identical technical effect.
In order to solve the above technical problems, the embodiment of the invention also provides a kind of computer program product, the computers
Program product includes the computer program being stored in non-transient computer readable storage medium, and the computer program includes journey
Sequence instruction makes the computer execute method described in the above various aspects when described program instruction is computer-executed, and
Realize identical technical effect.
The invention has the advantages that coping with the measurement demand of increasingly increased underwater sound passive material insertion loss, automatically
Complete the measurement work of underwater sound passive material insertion loss.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 shows a kind of underwater sound passive material insertion loss applied to pressure noise elimination water pot provided in an embodiment of the present invention
The flow chart of method for automatic measurement；
Fig. 2 shows another embodiment of the present invention provides a kind of underwater sound passive material insertion applied to pressure noise elimination water pot
Lose method for automatic measurement；
Fig. 3 shows the structural schematic diagram of underwater sound passive material insertion loss automatic measuring system；
Fig. 4 is provided in an embodiment of the present invention to execute a kind of underwater sound passive material insertion damage applied to pressure noise elimination water pot
Lose the hardware structural diagram of the electronic equipment of method for automatic measurement.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail, it is to be understood that guarantor of the invention
Shield range is not limited by the specific implementation.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.Unless
Separately have it is other explicitly indicate that, otherwise in entire disclosure and claims, term " includes " or its transformation such as "comprising" or
" including " etc. will be understood to comprise stated element or component, and not exclude other elements or other compositions
Part.
Dedicated word " exemplary " means " being used as example, embodiment or illustrative " herein.Here as " exemplary "
Illustrated any embodiment should not necessarily be construed as preferred or advantageous over other embodiments.
In addition, in order to better illustrate the present invention, numerous details is given in specific embodiment below.
It will be appreciated by those skilled in the art that without certain details, the present invention equally be can be implemented.In some instances, for
Method well known to those skilled in the art, means, element are not described in detail, in order to highlight purport of the invention.
Embodiment 1
Fig. 1 shows a kind of underwater sound passive material insertion loss applied to pressure noise elimination water pot provided in an embodiment of the present invention
The flow chart of method for automatic measurement, this method can be executed by electronic equipment, such as terminal device or server device.Change speech
It, the method can be executed by being mounted on software or the hardware of terminal device or server device.The server-side includes
But it is not limited to: single server, server cluster etc..As shown in Figure 1, this approach includes the following steps.
Step S1: hardware and parameter configuration step
Hardware and parameter configuration step, for the connection and data communication with hardware system, be modulated signal transmitting and
Setting signal triggers mode, and modulation generates digital signal and exports to signal generator, will be described by the signal generator
Digital signal carries out digital-to-analogue conversion, and will convert resulting analog signal transmission to power amplifier, to the power amplifier
After carrying out impedance matching, the analog signal transmission is realized that the underwater acoustic measurement signal of particular form is sent out to transmitting transducer battle array
It penetrates.
Step S2: measurement and data collection steps
Measurement and data collection steps, for the acquisition and demodulation of measurement data, at collected digital signal
Reason resolves channel response function based on least-squares algorithm, and the Secondary Emission letter after optimization is resolved based on liftering Measurement Algorithm
Number, acquisition is emitted based on multi-channel synchronous and obtains the final signal data of calculating.
Step S3: insertion loss calculates step
Insertion loss calculates step, for post-processing to final acquisition data, acquires to the measurement and data
The measurement result measured in step is calculated, and underwater sound passive material insertion loss measured value is obtained.
The insertion loss measurement may include: the two sides that hydrophone and transmitting transducer are divided to column sample, by described
Liftering Measurement Algorithm is reference signal in the default acquisition signal definition focused at hydrophone position when will not place sample,
Frequency domain representation is Piref(f)；
After sample being placed, the default liftering focus signal collected at hydrophone position that focuses is defined as sample
This signal is denoted as pt(t), frequency domain representation Pt(f), the reference signal and the sample signal are evened up in time-domain；Root
The measured value for obtaining sample insertion loss is calculated according to the reference signal and the sample are as follows:
In one possible implementation, the liftering Measurement Algorithm includes:
Liftering emits signal when a. generating single channel sky
Firstly, estimating channel response using least-squares algorithm.
According to the principle of least square, cost function is defined:
P (g)=(y-XFg)H(y-XFg) (2)
Wherein g indicates that the vector of channel response g (t) discrete amplitudes composition, subscript H indicate conjugate transposition, and y is discrete output
The vector of signal composition:
Y=[y0,y1,…,yN-1]T (3)
Wherein, ynIndicating n-th of output signal discrete value, n=0,1 ..., N-1, N indicates the quantity of signal discrete value, on
Marking T indicates vector transposition；F in cost function P (g) is Fourier transform matrix,
Wherein,J indicates imaginary unit；X in cost function P (g)
The diagonal matrix being made of discrete input signal, i.e. X=diag [x0,x1,…,xN-1], wherein xnIndicate n-th of input letter
Number discrete value；
For the minimum value for seeking P (g), it is enabled to be equal to zero to the partial derivative of g, i.e.,
Obtain channel response:
G=(XTX)-1XTy (5)
After obtaining channel response, liftering emits signal when being in next step empty by solution inverse filter acquisition；If inverse filter
Wave device is I (t), and it is δ (t) that energy converter, which emits signal, then hydrophone receives signal and may be expressed as:
Wherein, Indicate-l0The liftering coefficient at+L moment, τ indicate inverse filter
The discrete time index of wave system number, the sum of filter coefficient are L+1.Enable error energyMinimum,
It is zero that its first derivative, which can be obtained, it may be assumed that
Wherein n=-l0,-l0+1,…,-l0+L.Y (t) is substituted into above formula, is unfolded and transplants:
NoteFor the auto-correlation function of channel response, rδgIt (n) is transmitting signal and letter
The cross-correlation function of road response, then above formula becomes:
Above formula, which is expanded into matrix form, to be had:
The necessary condition of inverse filter is solved as inverse filter presence, and the inverse system response of a minimum phase system
Function certainly exists and is stable and cause and effect, therefore inverse filter is converted to minimum phase system；In view of inverse filter I
It must be that physics can realize signal, main energetic concentrates on [0, L], therefore takes l0=0, the minimum phase that note h (n) is g (n) is believed
Number, rhh(n) auto-correlation function for being h (n) substitutes into above formula and obtains:
Inverse filter coefficient I (0), I (1) ..., I (L), after inverse filter normalized can be obtained by solving above formula equation
It obtains liftering when corresponding channel sky and emits signal.
Liftering emits signal when b. generating multichannel sky
It repeats step a and obtains liftering transmitting signal when different channel skies, and sent out using the signal of each transmitting transducer
It penetrates time interval to even up liftering signal progress time delay, gained signal is denoted as sk(l), wherein l=1,2 ..., L, k=1,
2 ..., K, K indicate overall channel number.
In one possible implementation, another embodiment of the present invention provides it is a kind of applied to pressure noise elimination water pot
Underwater sound passive material insertion loss method for automatic measurement, further includes:
Step S4: data save and report generation step, as shown in Figure 2.
It is responsible for the storage of measurement result and the printing of measurement report, it is main to dock the document softwares such as Word, report is carried out
Output.
Fig. 3 shows the hardware structural diagram of underwater sound passive material insertion loss automatic measuring system, and Fig. 3 is using this
Inventive embodiments provide a kind of underwater sound passive material insertion loss method for automatic measurement applied to pressure noise elimination water pot it is hard
Part system, as shown in figure 3, whole system is mainly consisted of three parts including emission system, reception system and signal processing system.
Underwater sound passive material insertion loss automatic measuring system special-purpose software is installed in PXI-1042Q controller, by
PXI-1042Q controls arbitrarily signal generating device 33250A and generates signal, through NYK5888-B type power amplifier, is emitted by 127 yuan
Transducer array emits signal.
Five yuan of crosses receive after hydrophone array (and transmitting transducer split test model two sides) receives signal, by
PF28000 filter amplifier wideband filtered and amplified signal acquire signal by PXI-8108 capture card and are input to controller.NI
PXI-8108 capture card is synchronized with Agilent 33250A.Data analysis, processing and meter are carried out by PXI-1042Q controller
It calculates, finally obtains measurement result, digital oscilloscope Agilent DSO6014A is for monitoring each transmitting and reception signal.
Insertion loss measuring system capital equipment is as shown in the table.
Part is hung under water is broadly divided into three parts:
A. basic matrix is hung: being hung in tank body transmitting transducer battle array by tank mouth with crane, is fixed on the trolley of tank body bottom surface；
The equivalent acoustic centre of source of transmitting transducer battle array is consistent with water pot depth centre；Rotating cart platform makes basic matrix radiating surface perpendicular to acoustic axis
Line；Basic matrix cable is connect with power amplifier.
B. hydrophone is hung: receiving hydrophone battle array is hung on the right side of tank mouth on trolley；Adjustment hydrophone cradling piece listens water
Device battle array is located at water pot depth centre, adjusts trolley transverse direction distance to guarantee that hydrophone array is located at water pot horizontal direction center；
Hydrophone cables are connect with multi-channel wide band filter amplifier, and wideband filtered amplifier is made to be connected with corresponding acquisition channel.
C. sample to be tested is hung: sample is hung in tank mouth, by elevating lever by sample centralized positioning to water pot depth centre
(acoustic axis line), and gone to sample perpendicular to acoustic axis line by rotating mechanism, itself and water are adjusted in large-scale pressure noise elimination water pot
Listen device battle array spacing.
D. it hydrophone performance correction: for the validity and generality for guaranteeing measurement, avoids occurring when measurement excessive accidental
Error, test is using " five-element acoustic array " as reception battle array.In measurement process, underwater acoustic channel background noise is certain, transmitting is changed
On the basis of energy device transmitting signal is certain, the difference of the sensitivity level of hydrophone can produce bigger effect experimental result, in reality
It needs to carry out calibration to the sensitivity level of hydrophone before testing.
Using a kind of underwater sound passive material insertion loss applied to pressure noise elimination water pot provided in an embodiment of the present invention from
Two parts, i.e. reference signal test and sample signal test are broadly divided into when dynamic measurement method.Removing in insertion loss test needs
It replaces except test object, a kind of underwater sound passive material insertion applied to pressure noise elimination water pot provided in an embodiment of the present invention
Loss method for automatic measurement is not necessarily to be manually operated when in use, in reference signal test and sample signal test and insertion loss meter
Full-automatic testing may be implemented during calculating, the testing time can be greatly reduced, improve testing efficiency.Use the embodiment of the present invention
A kind of underwater sound passive material insertion loss method for automatic measurement process applied to pressure noise elimination water pot of offer is as follows:
A. reference signal testing process
Complete the scene confirmation of test object；
Run test software；
Selection liftering is tested and is determined；
Complete the hardware configuration and parameter configuration of software；
" starting to test " button is clicked, program is tested according to the frequency point in list of frequency；
Test software starts to test automatically, and all frequency points to be tested is waited to complete test；
After test, program returns to waiting for state, and " reference signal " and " channel response " data are saved.
B. sample signal testing process
Test object is replaced, the scene confirmation of test object is completed；
Test software is run again；
Selection liftering is tested and is determined；
Complete the hardware configuration and parameter configuration (can choose and import existing configuration) in test software；
" starting to test " button is clicked, program is tested according to the frequency point in list of frequency；
Test software starts to test automatically, and all frequency points to be tested is waited to complete test；
After test, program returns to waiting for state, and " sample signal " data are saved, meanwhile, insertion loss is surveyed
Amount calculated value is shown in front panel；
" saving data " button is clicked, test result is saved into Excel table.
" print data " button is clicked, test result is exported into test report Word template.
Embodiment 2
The embodiment of the invention provides a kind of non-transient (non-volatile) computer storage medium, the computer storage is situated between
Matter is stored with computer executable instructions, which can be performed the method in above-mentioned any means embodiment,
And realize identical technical effect.
Embodiment 3
The embodiment of the invention provides a kind of computer program product, the computer program product is non-temporary including being stored in
Computer program on state computer readable storage medium, the computer program include program instruction, when described program instructs
When being computer-executed, the computer is made to execute the method in above-mentioned any means embodiment, and realizes identical technology effect
Fruit.
Embodiment 4
Fig. 4 is provided in an embodiment of the present invention to execute a kind of underwater sound passive material insertion damage applied to pressure noise elimination water pot
The hardware structural diagram for losing the electronic equipment of method for automatic measurement, as shown, the equipment includes one or more processors
610 and memory 620.By taking a processor 610 as an example, which can also include: input unit 630 and output device
640。
Processor 610, memory 620, input unit 630 and output device 640 can pass through bus or other modes
It connects, in Fig. 4 for being connected by bus.
Memory 620 is used as a kind of non-transient computer readable storage medium, can be used for storing non-transient software program, non-
Transient computer executable program and module.The non-transient software journey that processor 610 is stored in memory 620 by operation
Sequence, instruction and module, thereby executing the various function application and data processing of electronic equipment, i.e. the realization above method is implemented
The processing method of example.
Memory 620 may include storing program area and storage data area, wherein storing program area can store operation system
Application program required for system, at least one function；It storage data area can storing data etc..In addition, memory 620 may include
High-speed random access memory, can also include non-transient memory, a for example, at least disk memory, flush memory device,
Or other non-transient solid-state memories.In some embodiments, it includes long-range relative to processor 610 that memory 620 is optional
The memory of setting, these remote memories can pass through network connection to processing unit.The example of above-mentioned network includes but not
It is limited to internet, intranet, local area network, mobile radio communication and combinations thereof.
Input unit 630 can receive the number or character information of input, and generate signal input.Output device 640 can
Equipment is shown including display screen etc..
One or more of modules are stored in the memory 620, when by one or more of processors
When 610 execution, the method in above-mentioned any means embodiment is executed, and realize identical technical effect.
Method provided by the embodiment of the present invention can be performed in the said goods, has the corresponding functional module of execution method and has
Beneficial effect.The not technical detail of detailed description in the present embodiment, reference can be made to method provided by the embodiment of the present invention.
The electronic equipment of the embodiment of the present invention exists in a variety of forms, including but not limited to following equipment.
(1) server: providing the equipment of the service of calculating, and the composition of server includes that processor, hard disk, memory, system are total
Line etc., server is similar with general computer architecture, but due to needing to provide highly reliable service, in processing energy
Power, stability, reliability, safety, scalability, manageability etc. are more demanding.
(2) other electronic devices with data interaction function.
The apparatus embodiments described above are merely exemplary, wherein described, unit can as illustrated by the separation member
It is physically separated with being or may not be, component shown as a unit may or may not be physics list
Member, it can it is in one place, or may be distributed over multiple network units.It can be selected according to the actual needs
In some or all of the modules achieve the purpose of the solution of this embodiment.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
It is realized by the mode of software plus general hardware platform, naturally it is also possible to pass through hardware.Based on this understanding, above-mentioned technology
Scheme substantially in other words can be embodied in the form of software products the part that the relevant technologies contribute, the computer
Software product may be stored in a computer readable storage medium, such as ROM/RAM, magnetic disk, CD, including some instructions to
So that computer equipment (can be personal computer, server or the network equipment etc.) execute each embodiment or
Method described in certain parts of embodiment.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (1)
1. being applied to the underwater sound passive material insertion loss method for automatic measurement of pressure noise elimination water pot characterized by comprising
(1) hardware and parameter configuration step are modulated signal transmitting and set for the connection and data communication with hardware system
Determine signal triggering mode, modulation generates digital signal and simultaneously exports to signal generator, by the signal generator by the number
Word signal carries out digital-to-analogue conversion, and will convert resulting analog signal transmission to power amplifier, to the power amplifier into
After row impedance matching, the analog signal transmission is realized that the underwater acoustic measurement signal of particular form is sent out to transmitting transducer battle array
It penetrates；
(2) measurement and data collection steps, for the acquisition and demodulation of measurement data, at collected digital signal
Reason resolves channel response function based on least-squares algorithm, and the Secondary Emission letter after optimization is resolved based on liftering Measurement Algorithm
Number, acquisition is emitted based on multi-channel synchronous and obtains the final signal data of calculating；The liftering Measurement Algorithm includes:
When generating single channel sky the step of liftering transmitting signal, for solving formula (1), inverse filter coefficient I (0), I are obtained
(1) ..., I (L) will obtain liftering when corresponding channel sky and emit signal after the inverse filter coefficient normalized；
When generating multichannel sky the step of liftering transmitting signal, liftering transmitting signal when the generation single channel sky is repeated
Step obtains liftering when different channel skies and emits signal, and utilizes the signal transmission time interval pair of each transmitting transducer
Liftering signal carries out time delay and evens up, and gained signal is denoted as sk(l), wherein l=1,2 ..., L, k=1,2 ..., K, K indicate total
Port number；
(3) insertion loss calculates step, for post-processing to final acquisition data, obtains to measurement in step (2)
Measurement result is calculated, and underwater sound passive material insertion loss measured value is obtained, and divides hydrophone and transmitting transducer to column sample
Two sides, by the liftering Measurement Algorithm, when will not place sample, in the default acquisition signal focused at hydrophone position
It is defined as reference signal, frequency domain representation Piref(f)；
After sample being placed, the default liftering focus signal collected at hydrophone position that focuses is defined as sample letter
Number, it is denoted as pt(t), frequency domain representation Pt(f), the reference signal and the sample signal are evened up in time-domain；According to institute
It states reference signal and the sample calculates the measured value for obtaining sample insertion loss are as follows:
(4) data save and report generation step, for the obtained underwater sound passive material insertion loss of measurement carry out storage and
Printout.
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