CN107831478B - A kind of automatic marking method and system of wind profile radar echo-signal - Google Patents
A kind of automatic marking method and system of wind profile radar echo-signal Download PDFInfo
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- CN107831478B CN107831478B CN201711041565.4A CN201711041565A CN107831478B CN 107831478 B CN107831478 B CN 107831478B CN 201711041565 A CN201711041565 A CN 201711041565A CN 107831478 B CN107831478 B CN 107831478B
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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
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/95—Radar or analogous systems specially adapted for specific applications for meteorological use
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
The present invention relates to the automatic marking methods and system of a kind of wind profile radar echo-signal, this method comprises: generating the analog echo signal of different predetermined power values；All analog echo signals are sequentially input to wind profile radar detection components, handle to obtain target echo signal corresponding with each analog echo signal through wind profile radar detection components；The calibration curve of wind profile radar is obtained according to the corresponding relationship of analog echo signal and target echo signal.The present invention improves the accuracy of calibration, improves the degree of automation of calibration.
Description
Technical field
The present invention relates to technical field of data processing more particularly to a kind of auto-scaling sides of wind profile radar echo-signal
Method and system.
Background technique
Wind profile radar is a kind of clear sky detecting devices, can be continuous, real with high temporal resolution and spatial resolution
When detect away from the more than ground 3 kilometers horizontal wind of atmosphere and the wind speed and directions of vertically-supplying air even in 20 kilometer ranges, and
The meteorological elements such as Refractive-index-structure parameter with height distribution.The echo-signal that wind profile radar obtains is to be amplified and located
Echo-signal after reason, the echo-signal are not directly applicable meteorological research, need to calibrate wind profile radar.It is existing
There are two types of calibrating methods, the first is calibrated using the signal-tonoise information of detection, and second is signal source Calibration Method.For
First method, due to estimating signal-to-noise ratio, and influence of the signal-to-noise ratio vulnerable to circuit parasitic concussion and external accidental interference in frequency domain,
So the error of calibration is larger.For second method, it is the analog echo signal needed by the transmitting of manual control signal source, deposits
The degree of automation is low and the serious problem of manpower consumption；And only to analog echo signal and target echo with linear relationship
Signal generates calibration curve, there is a problem of calibrating accuracy difference.
Summary of the invention
The technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide a kind of wind profile radar echo letter
Number automatic marking method and system.
The technical scheme to solve the above technical problems is that a kind of auto-scaling of wind profile radar echo-signal
Method, comprising:
Generate the analog echo signal of different predetermined power values；
All analog echo signals are sequentially input to wind profile radar detection components, are examined through the wind profile radar
Component is surveyed to handle to obtain target echo signal corresponding with each analog echo signal；
The calibration of wind profile radar is obtained according to the corresponding relationship of the analog echo signal and the target echo signal
Curve.
The beneficial effects of the present invention are: by the analog echo signal for generating different predetermined power values, to automatically generate
The analog echo signal needed, cost of labor and time caused by the analog echo signal for avoiding manual operation from being needed at
The problem of this increase, analog echo signal is input to wind profile radar detection components, obtains target echo signal through processing,
Calibration curve is obtained according to the corresponding relationship of analog echo signal and target echo signal, to automatically generate calibration curve, is mentioned
High the degree of automation of calibration, completes real-time calibration.
Another technical solution that the present invention solves above-mentioned technical problem is as follows: a kind of wind profile radar echo-signal it is automatic
Scaling system, including analogue echoes module, detection module and scaling module；
The analogue echoes module is used to generate the analog echo signal of different predetermined power values；
The detection module is used to sequentially input all analog echo signals to wind profile radar detection components, warp
The wind profile radar detection components handle to obtain target echo signal corresponding with each analog echo signal；
The scaling module according to the corresponding relationship of the analog echo signal and the target echo signal for obtaining
The calibration curve of wind profile radar.
The beneficial effects of the present invention are: by the analog echo signal for generating different predetermined power values, to automatically generate
The analog echo signal needed, cost of labor and time caused by the analog echo signal for avoiding manual operation from being needed at
The problem of this increase, analog echo signal is input to wind profile radar detection components, obtains target echo signal through processing,
Calibration curve is obtained according to the corresponding relationship of analog echo signal and target echo signal, to automatically generate calibration curve, is mentioned
High the degree of automation of calibration, completes real-time calibration.
Detailed description of the invention
Fig. 1 is that a kind of process of the automatic marking method for wind profile radar echo-signal that one embodiment of the invention provides is shown
It is intended to；
Fig. 2 be another embodiment of the present invention provides a kind of wind profile radar echo-signal automatic marking method process
Schematic diagram；
Fig. 3 is that a kind of structure of the automatic scaling system for wind profile radar echo-signal that one embodiment of the invention provides is shown
It is intended to；
Fig. 4 be another embodiment of the present invention provides a kind of wind profile radar echo-signal automatic scaling system structure
Schematic diagram.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
Currently, wind profile radar generates pumping signal, and pumping signal is emitted in atmosphere, wind profile radar is to process
The pumping signal of atmosphere is handled, and wind profile radar echo-signal is obtained, and wind profile radar echo-signal cannot be applied directly
In meteorological research.Wind profile radar is calibrated according to the method for the embodiment of the present invention, obtains the calibration of wind profile radar
Curve, can be obtained according to the calibration curve of wind profile radar and wind profile radar echo-signal, which can directly apply to meteorology, grinds
The signal studied carefully.
As shown in Figure 1, a kind of automatic marking method of wind profile radar echo-signal provided in an embodiment of the present invention, packet
It includes:
S1 generates the analog echo signal of different predetermined power values.
All analog echo signals are sequentially input to wind profile radar detection components, detect group through wind profile radar by S2
Part handles to obtain target echo signal corresponding with each analog echo signal.
S3 obtains the calibration curve of wind profile radar according to the corresponding relationship of analog echo signal and target echo signal.
A kind of automatic marking method of wind profile radar echo-signal provided in an embodiment of the present invention, it is different pre- by generating
If the analog echo signal of performance number avoids manual operation from being needed to automatically generate the analog echo signal of needs
Analog echo signal is input to Wind outline by the problem of increase of cost of labor caused by analog echo signal and time cost
Detections of radar component obtains target echo signal through processing, according to the corresponding relationship of analog echo signal and target echo signal
Calibration curve is obtained, to automatically generate calibration curve, the degree of automation of calibration is improved, completes real-time calibration.
Optionally, in the embodiment of the present invention, S1 includes:
The radiofrequency signal of constant power is generated by wind profile radar built-in signal source, radiofrequency signal passes through controllable attenuation network
The analog echo signal of different predetermined power values is generated according to different default attenuation degrees.
Specifically, the frequency of the radiofrequency signal of constant power is consistent with the frequency of the emitted signal of wind profile radar, so
Wind profile radar can be made to handle the analog echo signal of generation.The frequency of all analog echo signals be it is identical,
Power is different, and signal kinds are radio frequency.
The present embodiment is illustrated with a specific example below: 10 decibel milliwatts are generated by wind profile radar built-in signal source
(dBm) radiofrequency signal, controllable attenuation network are 0.5 decibel (dB) according to step units, and attenuation range is 0dB to 170dB, point
Other to decay to the radiofrequency signal, obtaining step units is 0.5dB, and the simulation that performance number range is 10dBm to -160dBm is returned
Wave signal.
In above-described embodiment, the radiofrequency signal of constant power, controllable attenuation are generated by wind profile radar built-in signal source
Network decays to radiofrequency signal according to the default attenuation degree of difference, generates the analog echo signal of different predetermined power values,
The analog echo signal for automatically generating needs, cost of labor caused by the analog echo signal for avoiding manual operation from being needed
The problem of with the increase of time cost.
Optionally, in the embodiment of the present invention, S2 includes:
All analog echo signals are sequentially input to wind profile radar detection components, through wind profile radar detection components into
Row amplification, filtering, mixing and signal processing obtain target echo signal corresponding with each analog echo signal, and calculate every
The performance number of a target echo signal.
Specifically, wind profile radar detection components may include receiving front-end, receiver and signal processor etc..To own
Analog echo signal is sequentially input to receiving front-end, the amplification and filtering processing of received front end, the Frequency mixing processing of received machine,
The signal through Frequency mixing processing is become into frequency domain from time domain from signal processor, and carries out analog-to-digital conversion, obtains simulating back with each
The corresponding target echo signal of wave signal, and calculate by signal processor the performance number of each target echo signal.
Illustrate the present embodiment below with a specific example: all analog echo signals include analog echo signal 1, simulate back
Analog echo signal 1, analog echo signal 2 and analog echo signal 3 are input to wind exterior feature by wave signal 2 and analog echo signal 3
Line detections of radar component, amplifies through wind profile radar detection components, filters, being mixed and signal processing, obtains and simulates back
The corresponding target echo signal 1 of wave signal 1, target echo signal 2 corresponding with analog echo signal 2, and believe with analogue echo
Number 3 corresponding target echo signals 3, and calculate the performance number of target echo signal 1, the performance number of target echo signal 2 and mesh
Mark the performance number of echo-signal 3.
In above-described embodiment, by sequentially inputting all analog echo signals to wind profile radar detection components, through putting
Greatly, filtering, mixing and signal processing, obtain target echo signal corresponding with each analog echo signal, improve target and return
The relevance of wave signal and wind profile radar is avoided not considering the problem that the loss of wind profile radar causes calibration error big, be mentioned
The high accuracy of calibration.The performance number for calculating each target echo signal, determines therefrom that target echo signal and analogue echo
The corresponding relationship of signal, to complete to calibrate.
Optionally, as shown in Fig. 2, in the embodiment of the present invention, S3 includes:
S31, judges whether the performance number of the performance number of each analog echo signal target echo signal corresponding with its has
Wired sexual intercourse.
Specifically, judge each analog echo signal performance number and target echo corresponding with each analog echo signal
Whether the performance number of signal has linear relationship.
S32 is generated according to the performance number of the analog echo signal with linear relationship and the performance number of target echo signal
First curve is returned using performance number and target of the index mapping least square method to the analog echo signal for not having linear relationship
The performance number of wave signal is handled, and the second curve is obtained.
Specifically, it is returned using performance number and target of the linear least square to the analog echo signal with linear relationship
The performance number of wave signal is handled, and the first curve is obtained, and the first curve is straight line.
First curve and the second curve are fitted by S33, obtain the calibration curve of wind profile radar.
In above-described embodiment, pass through performance number to the analog echo signal with linear relationship and target echo signal
Performance number generates the first curve, the power of performance number and target echo signal to the analog echo signal for not having linear relationship
Value generates the second curve, avoids the problem of rejecting calibration error caused by the signal without linear relationship, by the first song
Line and the second curve matching obtain calibration curve, it is established that the connection of the corresponding target echo signal of each analog echo signal
System, improves the accuracy of calibration.
Optionally, in the embodiment of the present invention, the simulation for not having linear relationship is returned using index mapping least square method
The performance number of wave signal and the performance number of target echo signal are handled, and are obtained the second curve and are included:
Index value is successively obtained from pre-stored index value, and according to the index value of acquisition to not having linear relationship
The performance number of target echo signal carries out exponential transform, performance number after carrying out exponential transform and the mould for not having linear relationship
When the performance number matching of quasi- echo-signal, then linear relation is generated according to matching relationship, logarithm change is carried out to linear relation
It changes, obtains the second curve.
Specifically, pre-stored index value can be determined according to the parameter of wind profile radar.And pre-stored index
The quantity of value is limited, and so then avoids the problem of can not generating linear relation.
In addition, if default attenuation degree includes low attenuation degree and highly attenuating degree, for not having linear relationship
All analog echo signals decline according to obtained second curve of the corresponding analog echo signal of highly attenuating degree with according to low
It is identical for subtracting obtained second curve of the corresponding analog echo signal of degree, as long as thus in the feelings for generating the first curve
Second curve is generated under condition can be fitted to obtain the calibration curve of wind profile radar.The low attenuation degree and highly attenuating degree
It is to have linearly for the corresponding attenuation degree of the analog echo signal with linear relationship when attenuation degree is lower than
Then it is low attenuation degree when the corresponding attenuation degree of the analog echo signal of relationship, there is linear relationship when attenuation degree is higher than
Analog echo signal corresponding attenuation degree when, then be highly attenuating degree.
Index value can be according to sequential storage from small to large or according to sequential storage from big to small, consecutive indexing value
Between difference be default value, which can be 0.2.Successively obtaining index value from pre-stored index value can wrap
It includes: from pre-stored index value successively obtaining index value according to the numerical value sequence from small to large of index value or according to index value
Numerical value sequence from big to small successively obtain index value etc. from pre-stored index value.
The present embodiment is illustrated with a specific example below:
Index value i is successively obtained from pre-stored index value, according to the index value i of acquisition to not having linear relationship
The performance number b of target echo signal carries out exponential transform, and expression formula may include: eib。
Performance number e after carrying out exponential transformibThere is the relationship of linear matched with the performance number a of analog echo signal
When, linear relation is generated according to matching relationship, linear relation may include: eib=Aa+B.
Logarithmic transformation is carried out to linear relation, expression formula may include: b=ln (Aa+B)/i, according to b=ln (Aa+
B)/i obtains the second curve, to establish the relationship of target echo signal and analog echo signal.
Wherein, b is the performance number of target echo signal, and i is the index value obtained, and a is corresponding with target echo signal
The performance number of analog echo signal, A and B are constants.
In above-described embodiment, exponential transform is carried out by performance number of the different index values to target echo signal, works as finger
When performance number after transformation of variables is matched with the performance number for the analog echo signal for not having linear relationship, according to matching relationship and right
Transformation of variables obtains the second curve, has found contacting for analog echo signal and target echo signal without linear relationship, keeps away
Exempt from the problem of rejecting calibration error caused by the signal without linear relationship, improves the accuracy of calibration.
As shown in figure 3, a kind of automatic scaling system of wind profile radar echo-signal provided in an embodiment of the present invention, including
Analogue echoes module, detection module and scaling module.
Analogue echoes module is used to generate the analog echo signal of different predetermined power values.
Detection module is for sequentially inputting all analog echo signals to wind profile radar detection components, through Wind outline thunder
It handles to obtain target echo signal corresponding with each analog echo signal up to detection components.
Scaling module is used to obtain wind profile radar according to the corresponding relationship of analog echo signal and target echo signal
Calibration curve.
A kind of automatic scaling system of wind profile radar echo-signal provided in an embodiment of the present invention, it is different pre- by generating
If the analog echo signal of performance number avoids manual operation from being needed to automatically generate the analog echo signal of needs
Analog echo signal is input to Wind outline by the problem of increase of cost of labor caused by analog echo signal and time cost
Detections of radar component obtains target echo signal through processing, according to the corresponding relationship of analog echo signal and target echo signal
Calibration curve is obtained, to automatically generate calibration curve, the degree of automation of calibration is improved, completes real-time calibration.
Optionally, as shown in figure 4, in the embodiment of the present invention, analogue echoes module includes the letter for being built in wind profile radar
Number source and controllable attenuation network.
Signal source is used to generate the radiofrequency signal of constant power.
Controllable attenuation network is used to generate radiofrequency signal according to different default attenuation degrees the mould of different predetermined power values
Quasi- echo-signal.
In above-described embodiment, the radiofrequency signal of constant power, controllable attenuation are generated by wind profile radar built-in signal source
Network decays to radiofrequency signal according to the default attenuation degree of difference, generates the analog echo signal of different predetermined power values,
The analog echo signal for automatically generating needs, cost of labor caused by the analog echo signal for avoiding manual operation from being needed
The problem of with the increase of time cost.
Optionally, as shown in figure 4, in the embodiment of the present invention, detection module is specifically used for:
All analog echo signals are sequentially input to wind profile radar detection components, through wind profile radar detection components into
Row amplification, filtering, mixing and signal processing obtain target echo signal corresponding with each analog echo signal, and calculate every
The performance number of a target echo signal.
In above-described embodiment, by sequentially inputting all analog echo signals to wind profile radar detection components, through putting
Greatly, filtering, mixing and signal processing, obtain target echo signal corresponding with each analog echo signal, improve target and return
The relevance of wave signal and wind profile radar is avoided not considering the problem that the loss of wind profile radar causes calibration error big, be mentioned
The high accuracy of calibration.The performance number for calculating each target echo signal, determines therefrom that target echo signal and analogue echo
The corresponding relationship of signal, to complete to calibrate.
Optionally, as shown in figure 4, in the embodiment of the present invention, scaling module includes judgment module, the first curve generation mould
Block, the second curve generation module and fitting module.
Judgment module is used to judge the power of the performance number of each analog echo signal target echo signal corresponding with its
Whether value has linear relationship, is to call the first curve generation module, otherwise calls the second curve generation module.
First curve generation module is used for performance number and target echo according to the analog echo signal with linear relationship
The performance number of signal generates the first curve.
Second curve generation module is used for using index mapping least square method to the analogue echo for not having linear relationship
The performance number of signal and the performance number of target echo signal are handled, and the second curve is obtained.
Fitting module obtains the calibration curve of wind profile radar for the first curve and the second curve to be fitted.
In above-described embodiment, pass through performance number to the analog echo signal with linear relationship and target echo signal
Performance number generates the first curve, the power of performance number and target echo signal to the analog echo signal for not having linear relationship
Value generates the second curve, avoids the problem of rejecting calibration error caused by the signal without linear relationship, by the first song
Line and the second curve matching obtain calibration curve, it is established that the connection of the corresponding target echo signal of each analog echo signal
System, improves the accuracy of calibration.
Optionally, in the embodiment of the present invention, the second curve generation module is specifically used for:
Index value is successively obtained from pre-stored index value, and according to the index value of acquisition to not having linear relationship
The performance number of target echo signal carries out exponential transform, performance number after carrying out exponential transform and the mould for not having linear relationship
When the performance number matching of quasi- echo-signal, then linear relation is generated according to matching relationship, logarithm change is carried out to linear relation
It changes, obtains the second curve.
In above-described embodiment, exponential transform is carried out by performance number of the different index values to target echo signal, works as finger
When performance number after transformation of variables is matched with the performance number for the analog echo signal for not having linear relationship, according to matching relationship and right
Transformation of variables obtains the second curve, has found contacting for analog echo signal and target echo signal without linear relationship, keeps away
Exempt from the problem of rejecting calibration error caused by the signal without linear relationship, improves the accuracy of calibration.
Function performed by each module of the system a kind of above-described embodiment wind profile radar echo-signal from
It is had been described in detail in dynamic calibrating method, which is not described herein again.
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 (8)
1. a kind of automatic marking method of wind profile radar echo-signal characterized by comprising
Generate the analog echo signal of different predetermined power values；
All analog echo signals are sequentially input to wind profile radar detection components, through the wind profile radar detection group
Part handles to obtain target echo signal corresponding with each analog echo signal；
Judge whether the performance number of the performance number of each analog echo signal target echo signal corresponding with its has linear pass
System；
The first curve is generated according to the performance number of the analog echo signal with linear relationship and the performance number of target echo signal,
Otherwise believed using performance number and target echo of the index mapping least square method to the analog echo signal for not having linear relationship
Number performance number handled, obtain the second curve；
First curve and second curve are fitted, the calibration curve of the wind profile radar is obtained.
2. the method according to claim 1, wherein the analog echo signal for generating different predetermined power values
Include:
The radiofrequency signal of constant power is generated by wind profile radar built-in signal source, the radiofrequency signal passes through controllable attenuation network
The analog echo signal of different predetermined power values is generated according to different default attenuation degrees.
3. the method according to claim 1, wherein it is described by all analog echo signals sequentially input to
Wind profile radar detection components handle to obtain mesh corresponding with each analog echo signal through the wind profile radar detection components
Marking echo-signal includes:
All analog echo signals are sequentially input to wind profile radar detection components, through the wind profile radar detection group
Part is amplified, filtered, being mixed and signal processing, obtains target echo signal corresponding with each analog echo signal, and count
Calculate the performance number of each target echo signal.
4. the method according to claim 1, wherein described use index mapping least square method to without line
The performance number of the analog echo signal of sexual intercourse and the performance number of target echo signal are handled, and are obtained the second curve and are included:
Index value is successively obtained from pre-stored index value, and according to the index value of acquisition to the target for not having linear relationship
The performance number of echo-signal carries out exponential transform, and performance number after carrying out exponential transform is returned with the simulation for not having linear relationship
When the performance number matching of wave signal, then linear relation is generated according to matching relationship, logarithm change is carried out to the linear relation
It changes, obtains second curve.
5. a kind of automatic scaling system of wind profile radar echo-signal, which is characterized in that including analogue echoes module, detection mould
Block and scaling module；
The analogue echoes module is used to generate the analog echo signal of different predetermined power values；
The detection module is for sequentially inputting all analog echo signals to wind profile radar detection components, through described
Wind profile radar detection components handle to obtain target echo signal corresponding with each analog echo signal；
The scaling module, including judgment module, the first curve generation module, the second curve generation module and fitting module；
The judgment module is used to judge the power of the performance number of each analog echo signal target echo signal corresponding with its
Whether value has linear relationship, is to call the first curve generation module, otherwise calls the second curve generation module；
The first curve generation module is used for performance number and target echo according to the analog echo signal with linear relationship
The performance number of signal generates the first curve；
The second curve generation module is used for using index mapping least square method to the analogue echo for not having linear relationship
The performance number of signal and the performance number of target echo signal are handled, and the second curve is obtained；
The fitting module obtains the wind profile radar for first curve and second curve to be fitted
Calibration curve.
6. system according to claim 5, which is characterized in that the analogue echoes module includes being built in wind profile radar
Signal source and controllable attenuation network；
The signal source is used to generate the radiofrequency signal of constant power；
The controllable attenuation network is used to the radiofrequency signal generating different predetermined power values according to the default attenuation degree of difference
Analog echo signal.
7. system according to claim 5, which is characterized in that the detection module is specifically used for:
All analog echo signals are sequentially input to wind profile radar detection components, through the wind profile radar detection group
Part is amplified, filtered, being mixed and signal processing, obtains target echo signal corresponding with each analog echo signal, and count
Calculate the performance number of each target echo signal.
8. system according to claim 5, which is characterized in that the second curve generation module is specifically used for:
Index value is successively obtained from pre-stored index value, and according to the index value of acquisition to the target for not having linear relationship
The performance number of echo-signal carries out exponential transform, and performance number after carrying out exponential transform is returned with the simulation for not having linear relationship
When the performance number matching of wave signal, then linear relation is generated according to matching relationship, logarithm change is carried out to the linear relation
It changes, obtains second curve.
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