CN106154288A - A kind of all-fiber is concerned with laser doppler wind detection method and radar system continuously - Google Patents
A kind of all-fiber is concerned with laser doppler wind detection method and radar system continuously Download PDFInfo
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- CN106154288A CN106154288A CN201610683105.0A CN201610683105A CN106154288A CN 106154288 A CN106154288 A CN 106154288A CN 201610683105 A CN201610683105 A CN 201610683105A CN 106154288 A CN106154288 A CN 106154288A
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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
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar 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 invention discloses a kind of all-fiber to be concerned with continuously laser doppler wind detection method and radar system, described method includes: flashlight and local oscillator light are divided into two identical bundle signals respectively；A branch of signal of local oscillator light keeps initial phase constant, and another bundle signal of local oscillator light offsets 90 degree in initial phase；The signal that two bundle phase places of local oscillator light are different restraints, with the two of flashlight, the signal beat frequency that phase places are identical respectively；Beat frequency is obtained two-beam signal and is respectively converted into the signal of telecommunication；Signal of telecommunication reconvert becomes digital signal；Digital signal is done fast Fourier transform, then after orthogonal processing, according to frequency values in the peak value present position of positive axis of the imaginary part of signal and positive and negative, is calculated the velocity amplitude of radially wind speed and judges the wind direction of radially wind speed.Therefore present invention achieves in the case of not improving signal sampling rate, improve measuring wind speed scope and the signal to noise ratio of radar signal.
Description
Technical field
The present invention relates to anemometry laser radar technical field, particularly relate to a kind of all-fiber and be concerned with continuously laser doppler
Wind detection method and a kind of all-fiber are concerned with Doppler wind-measuring laser radar system continuously.
Background technology
Anemometry laser radar system, is to utilize laser to collide with the particulate of motion in air, back scattering
The doppler shift effect of signal measures atmospheric wind.The coherent Doppler lidar used in Atmospheric Survey at present is basic
Being all to use acousto-optic frequency shifters, on the basis of launching laser fundamental frequency, one intermediate-freuqncy signal of superposition is amplified is transmitted in air,
Backscatter signal with launch laser fundamental frequency signal beat frequency, according to frequency values and the intermediate frequency letter of the peak value present position of beat signal
Number the difference of frequency, and then obtain radially wind speed and direction thereof.
In order to obtain direction aweather, footpath, prior art superposition intermediate-freuqncy signal, reason is the peak value according to beat signal
The difference of the frequency values of present position and the frequency of intermediate-freuqncy signal can obtain the direction of radially wind speed.But cause same
Under measuring wind speed range requirement, required peak point sample rate increases, and then improves laser radar and to AD card sample rate and be
The requirement of system memory data output.If under same hardware condition, under the sampling rate of the most same signal picker, then
Reduce the measuring wind speed scope of radar system, also reduce the signal to noise ratio of radar signal simultaneously, namely reduce wind speed and survey
The accuracy of amount.
Summary of the invention
In view of the above problems, it is proposed that a kind of all-fiber is concerned with laser doppler wind detection method and system continuously, to solve
Under the sampling rate of same signal picker, the measuring wind speed scope of radar system reduces and the signal to noise ratio fall of radar signal
Low problem.
According to one aspect of the present invention, it is provided that a kind of all-fiber is concerned with laser doppler wind detection method continuously, including:
Use 1*2 fiber coupler that narrow linewidth continuous laser is divided into local oscillator light and seed light；
Flashlight is produced after receiving amplified described seed light backscatter signal in an atmosphere；
Described flashlight is divided into the first flashlight and secondary signal light, described local oscillator light is divided into the first local oscillator light and
Two local oscillator light, described first flashlight and described first local oscillator photo-beat frequency obtain the first mixed frequency signal, and described second local oscillator light exists
Initial phase obtains the second mixed frequency signal with described secondary signal light beat frequency after offseting 90 degree；
Described first mixed frequency signal and described second mixed frequency signal are respectively converted into first signal of telecommunication and second signal of telecommunication,
And described first signal of telecommunication and described second signal of telecommunication are converted into the first digital signal and the second digital signal；
Described first digital signal and described second digital signal are done fast Fourier transform, then to through quick Fu
In described first digital signal after leaf transformation and described second digital signal do orthogonal processing, be calculated the speed of radially wind speed
The direction of angle value and judgement radially wind speed.
Preferably, the step being calculated the radially velocity amplitude of wind speed described in includes:
After described orthogonal processing, it is calculated air according to the signal imaginary part frequency values in the peak value present position of positive axis
The Doppler frequency shift that wind field causes at radar velocity component in the radial direction；
The corresponding relation between velocity amplitude according to described Doppler frequency shift and radial direction wind speed, obtains the speed of radially wind speed
Value.
Preferably, judge described in that the step in the radially direction of wind speed includes:
After described orthogonal processing, according to the corresponding relation between imaginary part and the wind direction of signal, it is judged that the radially direction of wind speed.
Preferably, use 1*2 fiber coupler narrow linewidth continuous laser is divided into local oscillator light and seed light step it
Before, also include:
Seed laser is used to produce described narrow linewidth continuous laser.
According to a further aspect in the invention, it is provided that a kind of all-fiber is concerned with Doppler wind-measuring laser radar system continuously,
Including:
Optical fiber seed laser, 1*2 fiber coupler, EDFA Erbium-Doped Fiber Amplifier, circulator, optical antenna order connects successively
Connect；
Described 1*2 fiber coupler and described circulator are connected with 90 degree of phase controllers respectively；
Described 90 degree of phase controllers and the first photodetector and the second photodetector connect；
Described first photodetector and the second photodetector are connected with signal picker respectively；
Described signal picker is connected with data processor；
Described optical fiber seed laser, is used for producing narrow linewidth continuous laser；
Described 1*2 fiber coupler, for being divided into local oscillator light and seed light by described narrow linewidth continuous laser；
Described EDFA Erbium-Doped Fiber Amplifier, is used for amplifying described seed light；
Described circulator, enters optical antenna for transmitting amplified described seed light, and transmits described optical antenna
The flashlight received enters 90 degree of phase controllers；
Described optical antenna, for amplified described seed light being transmitted in air, and receives amplified described
Described flashlight is produced after seed light backscatter signal in an atmosphere；
Described 90 degree of phase controllers, for being divided into the first flashlight and secondary signal light by described flashlight, by described
Local oscillator light is divided into the first local oscillator light and the second local oscillator light, described first flashlight and described first local oscillator photo-beat frequency and obtains first and mix
Frequently signal, described second local oscillator light obtains the second mixed frequency signal with described secondary signal light beat frequency after initial phase offsets 90 degree；
Described first photodetector, for being converted into first signal of telecommunication by described first mixed frequency signal；
Described second photodetector, for being converted into second signal of telecommunication by described second mixed frequency signal；
Described signal picker, for being converted into the first digital signal by described first signal of telecommunication and described second signal of telecommunication
With the second digital signal；
Described data processor, becomes for described first digital signal and described second digital signal do fast Fourier
Change, then described first digital signal after fast Fourier transform and described second digital signal done orthogonal processing,
It is calculated the velocity amplitude of radially wind speed and judges the direction of radially wind speed.
Preferably, described 90 degree of phase controllers include:
First spectroscope connects the first frequency mixer and 90-degree phase shifter；
Described 90-degree phase shifter connects the second frequency mixer；
Second spectroscope connects described first frequency mixer and described second frequency mixer；
Described first spectroscope, for being divided into the first local oscillator light and the second local oscillator light by described local oscillator light；
Described second spectroscope, for being divided into the first flashlight and secondary signal light by described flashlight；
Described 90-degree phase shifter, for offseting 90 degree by the second local oscillator light in initial phase；
Described first frequency mixer, for described first flashlight and described first local oscillator photo-beat frequency, obtaining the first mixing
Signal；
Described second frequency mixer, for described second local oscillator light initial phase offset after 90 degree with described secondary signal light
Beat frequency, obtains the second mixed frequency signal.
According to the embodiment of the present invention, the first digital signal after fast Fourier transform and the second digital signal are done
After orthogonal processing, according to the imaginary part of the signal frequency values in the peak value present position of positive axis, obtain atmospheric wind in radar footpath
The Doppler frequency shift that velocity component on direction causes, and then obtain the velocity amplitude of radially wind speed, exist according to the imaginary part of signal
The peak value of positive axis positive and negative, it is possible to judge the wind direction of radially wind speed.And prior art is in order to judge the wind direction of radially wind speed,
Need one intermediate-freuqncy signal of superposition, according to backscatter signal and the peak value of the beat signal of local oscillator light and the frequency of intermediate-freuqncy signal
Difference, it is judged that the radially wind direction of wind speed.As can be seen here, when peak point sample rate is identical, can carry according to the embodiment of the present invention
The measurement scope of high wind speed.Therefore the embodiment of the present invention achieves in the case of not improving the AD card sample rate of laser radar, carries
The measuring wind speed scope of high LDV technique.
According to the embodiment of the present invention, when need not improve measuring wind speed scope, it is possible to reduce the AD card of laser radar
Sample rate, also reduces the memory data output of system simultaneously, thus reduces the cost of radar.
According to the embodiment of the present invention, owing to entering obtaining frequency spectrum after the first signal and secondary signal fast fourier transform
Row orthogonal processing, can improve the signal to noise ratio of radar signal, thus improve the accuracy of measuring wind speed.
Accompanying drawing explanation
By reading the detailed description of hereafter preferred implementation, various other advantage and benefit common for this area
Technical staff will be clear from understanding.Accompanying drawing is only used for illustrating the purpose of preferred implementation, and is not considered as the present invention
Restriction.And in whole accompanying drawing, it is denoted by the same reference numerals identical parts.In the accompanying drawings:
Fig. 1 be according to embodiments of the present invention one a kind of all-fiber be concerned with continuously the flow process of laser doppler wind detection method
Figure；
Fig. 2 be according to embodiments of the present invention two a kind of all-fiber be concerned with continuously the light of laser doppler windfinding radar system
Road schematic diagram；
Fig. 3 is the light path principle figure of 90 degree of phase controllers；
Fig. 4 be application all-fiber be concerned with continuously laser doppler windfinding radar system detection Horizontal Winds principle signal
Figure；
Fig. 5 be application all-fiber be concerned with continuously laser doppler windfinding radar system detection Horizontal Winds Computing Principle show
It is intended to.
Detailed description of the invention
It is more fully described the exemplary embodiment of the disclosure below with reference to accompanying drawings.Although accompanying drawing shows the disclosure
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure and should be by embodiments set forth here
Limited.On the contrary, it is provided that these embodiments are able to be best understood from the disclosure, and can be by the scope of the present disclosure
Complete conveys to those skilled in the art.
Embodiment one
With reference to Fig. 1, it is shown that a kind of all-fiber in the embodiment of the present invention one is concerned with laser doppler wind detection method continuously
Flow chart, specifically may include that
Step 101, uses 1*2 fiber coupler that narrow linewidth continuous laser is divided into local oscillator light and seed light.
In the embodiment of the present invention, 1*2 fiber coupler is for dividing narrow linewidth continuous laser to two from an optical fiber
In optical fiber, wherein, the optical signal in an optical fiber is referred to as local oscillator light, and the optical signal in another optical fiber is referred to as seed light, local oscillator
Light and seed light may be expressed as:
Wherein, ElFor the amplitude of light, f0For light frequency,Initial phase for light.
Step 102, produces flashlight after receiving amplified described seed light backscatter signal in an atmosphere.
In embodiments of the present invention, seed light is transmitted in air after being exaggerated, with the particulate of motion in air
Colliding, produce Doppler frequency shift, backscatter signal produces flashlight after being received.
Specifically, EDFA Erbium-Doped Fiber Amplifier can be used seed light to be amplified, the seed light after amplification passes through circulator
Being transmitted in air by optical antenna, the backscatter signal of seed light enters in optical fiber after being received by optical antenna, by optical fiber
In optical signal be referred to as flashlight, flashlight can be expressed as:
Wherein, EsFor the amplitude of flashlight, Δ f is atmospheric wind to be caused many at radar velocity component in the radial direction
General Le frequency displacement,Initial phase for flashlight.
Step 103, is divided into the first flashlight and secondary signal light by described flashlight, and described local oscillator light is divided into first
Shake light and the second local oscillator light, and described first flashlight and described first local oscillator photo-beat frequency obtain the first mixed frequency signal, and described second
Local oscillator light obtains the second mixed frequency signal with described secondary signal light beat frequency after initial phase offsets 90 degree.
In embodiments of the present invention, flashlight enters 90 degree of phase controllers through circulator, and local oscillator light is also into 90 degree of phases
Level controller, flashlight is divided into the first flashlight and secondary signal light by the spectroscope of 50:50, and the initial phase of two bundle signals is all protected
Hold constant, can be expressed as:
Wherein, E is the amplitude that flashlight is divided into after identical two part, Δ f be atmospheric wind at radar in the radial direction
The Doppler frequency shift that causes of velocity component,Initial phase for flashlight.
Local oscillator light is divided into the first local oscillator light and the second local oscillator light by the spectroscope of 50:50, at the beginning of described first local oscillator light keeps
Phase invariant, can be expressed as:
Wherein, E is the amplitude of light, f0For light frequency,Initial phase for light.
The initial phase of described second local oscillator light offsets 90 degree, can be expressed as:
Wherein, E is the amplitude of light, f0For light frequency,Initial phase for light.
First flashlight and the first local oscillator photo-beat frequency obtain the first mixed frequency signal, and the first mixed frequency signal is referred to as I road
Beat frequency light, can be expressed as:
Wherein, IIFor the amplitude of the light intensity of I road beat frequency light, Δ f is atmospheric wind to be divided in radar speed in the radial direction
The Doppler frequency shift that amount causes,Initial phase for I road beat frequency light.
Second local oscillator light obtains the second mixed frequency signal, the second mixing after initial phase offsets 90 degree with secondary signal light beat frequency
Signal is referred to as Q road beat frequency light, can be expressed as:
Wherein, IQFor the amplitude of the light intensity of Q road beat frequency light, Δ f is atmospheric wind to be divided in radar speed in the radial direction
The Doppler frequency shift that amount causes,Initial phase for Q road beat frequency light.
Wherein beat frequency refers to the conjunction ripple of two optical signals, and optical mixer specifically can be used to realize.
Step 104, is respectively converted into first signal of telecommunication and by described first mixed frequency signal and described second mixed frequency signal
Two signals of telecommunication, and described first signal of telecommunication and described second signal of telecommunication are converted into the first digital signal and the second digital signal.
In embodiments of the present invention, the first mixed frequency signal and the second mixed frequency signal have respectively entered photodetector, and light is believed
Being converted into first signal of telecommunication and second signal of telecommunication after number entrance photodetector, described photodetection implement body can use flat
Weighing apparatus detector.
First signal of telecommunication and the second signal of telecommunication entering signal harvester, obtain the first digital signal and the second digital signal,
Described signals collecting implement body can use AD card.
Step 105, does fast Fourier transform, then to warp to described first digital signal and described second digital signal
Cross described first digital signal after fast Fourier transform and described second digital signal does orthogonal processing, be calculated radially
The direction of the velocity amplitude of wind speed and judgement radially wind speed.
In embodiments of the present invention, the first digital signal and the second digital signal are in quick Fu by data processor respectively
Leaf transformation, the frequency-domain expression of the first digital signal is:
I (f)=F (i (t))=F ((ej2πΔft+e-j2πΔft)/2)=δ (2 π Δ f)/2+ δ (-2 π Δ f)/2,
The frequency-domain expression of the second digital signal is:
Q (f)=F (q (t))=F ((ej2πΔft-e-j2πΔft)/(2j))=-j × δ (2 π Δ f)/2+-j × δ (-2 π Δ f)/
2,
After the first digital signal after fast Fourier transform and the second digital signal are done orthogonal processing, take void
Portion, expression formula is:
Wherein, the Δ f Doppler frequency shift that to be atmospheric wind cause at radar velocity component in the radial direction.
The corresponding relation between velocity amplitude according to described Doppler frequency shift and radial direction wind speed, obtains the speed of radially wind speed
Value.
The corresponding relation between imaginary part and wind direction according to signal obtains the wind direction of radially wind speed.
In embodiments of the present invention, it is preferable that described in be calculated the velocity amplitude of radially wind speed and include:
After described orthogonal processing, it is calculated air according to the signal imaginary part frequency values in the peak value present position of positive axis
The Doppler frequency shift that wind field causes at radar velocity component in the radial direction；
The corresponding relation between velocity amplitude according to Doppler frequency shift and radial direction wind speed, obtains the velocity amplitude of radially wind speed.
After the first digital signal after fast Fourier transform and the second digital signal are done orthogonal processing, take void
Portion, expression formula is:
Specifically, two ways of digital signals, after fast Fourier transform and orthogonal processing, can calculate atmospheric wind
At the Doppler frequency shift Δ f that radar velocity component in the radial direction causes, according to the speed of Doppler frequency shift Δ f with radially wind speed
Corresponding relation between angle value:
Wherein, λ is the wavelength launching laser, and v be radial direction wind speed, and Δ f is atmospheric wind in radar speed in the radial direction
The Doppler frequency shift that degree component causes.
Obtain the velocity amplitude of radially wind speed.
In embodiments of the present invention, it is preferable that the described direction judging radially wind speed includes:
After described orthogonal processing, according to the corresponding relation between imaginary part and the wind direction of signal, it is judged that the radially wind direction of wind speed.
Specifically, the first digital signal after fast Fourier transform and the second digital signal are done orthogonal processing
After, taking imaginary part, expression formula is:
Wherein, the Δ f Doppler frequency shift that to be atmospheric wind cause at radar velocity component in the radial direction.
If S (Δ f) the peak value of positive axis be on the occasion of, then judge Δ f more than 0, radially the wind direction of wind speed is just, instead
It, if (Δ f) is negative value at the peak value of positive axis to S, then judge that Δ f is less than 0, and radially the wind direction of wind speed is negative.
In embodiments of the present invention, it is preferable that also include before step 101: use seed laser to produce described narrow line
Wide continuous laser.Specifically, using seed laser to produce frequency is f0Narrow linewidth continuous laser, narrow linewidth continuous laser
1*2 fiber coupler is entered through optical fiber.
As it has been described above, according to the embodiment of the present invention, to the first digital signal and second after fast Fourier transform
After digital signal does orthogonal processing, according to the imaginary part of signal at the frequency values of the peak value present position of positive axis, obtain air wind
The Doppler frequency shift caused at radar velocity component in the radial direction, and then obtain the velocity amplitude of radially wind speed, according to letter
Number imaginary part peak value positive and negative of positive axis, it is possible to judge the wind direction of radially wind speed.And prior art is in order to judge radially
The wind direction of wind speed, needs one intermediate-freuqncy signal of superposition, according to the peak value of backscatter signal and the beat signal of local oscillator light and in
Frequently the difference of the frequency of signal, it is judged that the radially wind direction of wind speed.As can be seen here, when peak point sample rate is identical, according to the present invention
Embodiment can improve the measurement scope of wind speed.Therefore the embodiment of the present invention achieves and is not improving the AD card sample rate of laser radar
In the case of, improve the measuring wind speed scope of LDV technique.
According to the embodiment of the present invention, when need not improve measuring wind speed scope, it is possible to reduce the AD card of laser radar
Sample rate, also reduces the memory data output of system simultaneously, thus reduces the cost of radar.
According to the embodiment of the present invention, owing to entering obtaining frequency spectrum after the first signal and secondary signal fast fourier transform
Row orthogonal processing, can improve the signal to noise ratio of radar signal, thus improve the accuracy of measuring wind speed.
It should be noted that for embodiment of the method, in order to be briefly described, therefore it is all expressed as a series of action group
Closing, but those skilled in the art should know, the embodiment of the present invention is not limited by described sequence of movement, because depending on
According to the embodiment of the present invention, some step can use other orders or carry out simultaneously.Secondly, those skilled in the art also should
Knowing, embodiment described in this description belongs to preferred embodiment, and the involved action not necessarily present invention implements
Necessary to example.
Embodiment two
With reference to Fig. 2, it is shown that a kind of all-fiber of the embodiment of the present invention two is concerned with laser doppler windfinding radar system continuously
The light path principle figure of system, with reference to Fig. 3, it is shown that the light path principle figure of 90 degree of phase controllers, specifically may include that
Optical fiber seed laser, 1*2 fiber coupler, EDFA Erbium-Doped Fiber Amplifier, circulator, optical antenna order connects successively
Connect；
1*2 fiber coupler and described circulator are connected with 90 degree of phase controllers respectively；
90 degree of phase controllers and the first photodetector and the second photodetector connect；
First photodetector and the second photodetector are connected with signal picker respectively；
Signal picker is connected with data processor；
Optical fiber seed laser, is used for producing narrow linewidth continuous laser；
1*2 fiber coupler, for being divided into local oscillator light and seed light by narrow linewidth continuous laser；
EDFA Erbium-Doped Fiber Amplifier, is used for amplifying seed light；
Circulator, enters optical antenna, and the signal that transmission optical antenna receives for transmitting amplified seed light
Light enters 90 degree of phase controllers；
Optical antenna, for amplified seed light being transmitted in air, and receives amplified seed light at air
In backscatter signal after produce flashlight；
90 degree of phase controllers, for flashlight is divided into the first flashlight and secondary signal light, are divided into the by local oscillator light
One local oscillator light and the second local oscillator light, the first flashlight and the first local oscillator photo-beat frequency obtain the first mixed frequency signal, and the second local oscillator light exists
Initial phase obtains the second mixed frequency signal with secondary signal light beat frequency after offseting 90 degree；
First photodetector, for being converted into first signal of telecommunication, described first photodetector by the first mixed frequency signal
Response range be 0-100MHz；
Second photodetector, for being converted into second signal of telecommunication, described second photodetector by the second mixed frequency signal
Response range be 0-100MHz；
Signal picker, for being converted into the first digital signal and the second numeral letter by first signal of telecommunication and second signal of telecommunication
Number, described signal picker can use AD card, a width of 500MHz of sample strip；
Data processor, for described first digital signal and described second digital signal are done fast Fourier transform,
Then described first digital signal after fast Fourier transform and described second digital signal are done orthogonal processing, calculate
Obtain the velocity amplitude of radially wind speed and judge the direction of radially wind speed..
In embodiments of the present invention, it is preferable that described 90 degree of phase controllers include:
First spectroscope connects the first frequency mixer and 90-degree phase shifter；
90-degree phase shifter connects the second frequency mixer；
Second spectroscope connects the first frequency mixer and the second frequency mixer；
First spectroscope, for being divided into the first local oscillator light and the second local oscillator light by local oscillator light；
Second spectroscope, for being divided into the first flashlight and secondary signal light by flashlight；
90-degree phase shifter, for offseting 90 degree by the second local oscillator light in initial phase；
First frequency mixer, for the first flashlight and the first local oscillator photo-beat frequency, obtaining the first mixed frequency signal；
Second frequency mixer, for the second local oscillator light initial phase offset after 90 degree with secondary signal light beat frequency, obtain the
Two mixed frequency signals.
As it has been described above, according to the embodiment of the present invention, to the first digital signal and second after fast Fourier transform
After digital signal does orthogonal processing, according to the imaginary part of signal at the frequency values of the peak value present position of positive axis, obtain air wind
The Doppler frequency shift caused at radar velocity component in the radial direction, and then obtain the velocity amplitude of radially wind speed, according to letter
Number imaginary part peak value positive and negative of positive axis, it is possible to judge the wind direction of radially wind speed.And prior art is in order to judge radially
The wind direction of wind speed, needs one intermediate-freuqncy signal of superposition, according to the peak value of backscatter signal and the beat signal of local oscillator light and in
Frequently the difference of the frequency of signal, it is judged that the radially wind direction of wind speed.As can be seen here, when peak point sample rate is identical, according to the present invention
Embodiment can improve the measurement scope of wind speed.Therefore the embodiment of the present invention achieves and is not improving the AD card sample rate of laser radar
In the case of, improve the measuring wind speed scope of LDV technique.
According to the embodiment of the present invention, when need not improve measuring wind speed scope, it is possible to reduce the AD card of laser radar
Sample rate, also reduces the memory data output of system simultaneously, thus reduces the cost of radar.
According to the embodiment of the present invention, owing to entering obtaining frequency spectrum after the first signal and secondary signal fast fourier transform
Row orthogonal processing, can improve the signal to noise ratio of radar signal, thus improve the accuracy of measuring wind speed.
Embodiment three
With reference to Fig. 4, it is shown that application all-fiber is concerned with laser doppler windfinding radar system detection Horizontal Winds continuously
Principle schematic, with reference to Fig. 5, it is shown that application all-fiber is concerned with laser doppler windfinding radar system detection Horizontal Winds continuously
Computing Principle schematic diagram, in the application present invention in all-fiber continuous coherent Doppler lidar system use double antenna
Mode carrys out the wind field in detecting laser radar front, measures the some focus point for transmitting laser, specific as follows shown:
Angle between two optical antennas and radar radial direction is α, and optical antenna 1 and 2 detects the radial direction obtained
Wind speed is V1And V2, it is assumed that the radial direction of radar is θ with the angle in positive north, then Horizontal Winds wind speed and direction calculating side
Method is as follows:
Vx=V1×sinα+V2×sinα
Vy=V1×cosα+V2×cosα
Wherein x-axis is identical with the radial direction of radar, and y-axis is vertical with radar radial direction,
So wind speed at the practical level wind field of coordinate system synthesis is
The wind direction of practical level wind field with the angle of x-axis is
Owing to the angle of radar radial direction with positive north is θ, then be 0 degree with positive north, then the wind direction of Horizontal Winds is:
By above-mentioned calculating, it is possible to obtain the wind speed and direction of Horizontal Winds.
For above-mentioned all-fiber is concerned with laser doppler windfinding radar system embodiment continuously, owing to it is real with method
Executing example basic simlarity, so describe is fairly simple, relevant part sees the part of embodiment of the method and illustrates.
Each embodiment in this specification all uses the mode gone forward one by one to describe, what each embodiment stressed is with
The difference of other embodiments, between each embodiment, identical similar part sees mutually.
Those of ordinary skill in the art are it is to be appreciated that combine that the disclosed embodiments in the embodiment of the present invention describe is each
The unit of example and algorithm steps, it is possible to being implemented in combination in of electronic hardware or computer software and electronic hardware.These
Function performs with hardware or software mode actually, depends on application-specific and the design constraint of technical scheme.Specialty
Technical staff specifically should can be used for using different methods to realize described function to each, but this realization should not
Think beyond the scope of this invention.
Those skilled in the art is it can be understood that arrive, for convenience and simplicity of description, the system of foregoing description,
The specific works process of device and unit, is referred to the corresponding process in preceding method embodiment, does not repeats them here.
In embodiment provided herein, it should be understood that disclosed apparatus and method, can be passed through other
Mode realizes.Such as, device embodiment described above is only schematically, such as, the division of described unit, it is only
A kind of logic function divides, actual can have when realizing other dividing mode, the most multiple unit or assembly can in conjunction with or
Person is desirably integrated into another system, or some features can be ignored, or does not performs.Another point, shown or discussed is mutual
Between coupling direct-coupling or communication connection can be the INDIRECT COUPLING by some interfaces, device or unit or communication link
Connect, can be electrical, machinery or other form.
The described unit illustrated as separating component can be or may not be physically separate, shows as unit
The parts shown can be or may not be physical location, i.e. may be located at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected according to the actual needs to realize the mesh of the present embodiment scheme
's.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it is also possible to
It is that unit is individually physically present, it is also possible to two or more unit are integrated in a unit.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art, in the technical scope that the invention discloses, can readily occur in change or replace, should contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with scope of the claims.
Claims (6)
1. an all-fiber is concerned with laser doppler wind detection method continuously, it is characterised in that including:
Use 1*2 fiber coupler that narrow linewidth continuous laser is divided into local oscillator light and seed light；
Flashlight is produced after receiving amplified described seed light backscatter signal in an atmosphere；
Described flashlight is divided into the first flashlight and secondary signal light, described local oscillator light is divided into the first local oscillator light and second
Shake light, and described first flashlight and described first local oscillator photo-beat frequency obtain the first mixed frequency signal, and described second local oscillator light is in first phase
The second mixed frequency signal is obtained with described secondary signal light beat frequency after position skew 90 degree；
Described first mixed frequency signal and described second mixed frequency signal are respectively converted into first signal of telecommunication and second signal of telecommunication, and will
Described first signal of telecommunication and described second signal of telecommunication are converted into the first digital signal and the second digital signal；
Described first digital signal and described second digital signal are done fast Fourier transform, then to through fast Fourier
Described first digital signal and described second digital signal after conversion do orthogonal processing, are calculated the velocity amplitude of radially wind speed
With the direction judging radially wind speed.
Method the most according to claim 1, it is characterised in that described in be calculated the velocity amplitude of radially wind speed and include:
After described orthogonal processing, it is calculated atmospheric wind according to the signal imaginary part frequency values in the peak value present position of positive axis
At the Doppler frequency shift that radar velocity component in the radial direction causes；
The corresponding relation between velocity amplitude according to described Doppler frequency shift and radial direction wind speed, obtains the velocity amplitude of radially wind speed.
Method the most according to claim 1, it is characterised in that the direction of described judgement radially wind speed includes:
After described orthogonal processing, according to the corresponding relation between imaginary part and the wind direction of signal, it is judged that the radially direction of wind speed.
Method the most according to claim 1, it is characterised in that also include:
Seed laser is used to produce described narrow linewidth continuous laser.
5. an all-fiber is concerned with Doppler wind-measuring laser radar system continuously, it is characterised in that including:
Optical fiber seed laser, 1*2 fiber coupler, EDFA Erbium-Doped Fiber Amplifier, circulator, optical antenna are sequentially connected with；
Described 1*2 fiber coupler and described circulator are connected with 90 degree of phase controllers respectively；
Described 90 degree of phase controllers and the first photodetector and the second photodetector connect；
Described first photodetector and the second photodetector are connected with signal picker respectively；
Described signal picker is connected with data processor；
Described optical fiber seed laser, is used for producing narrow linewidth continuous laser；
Described 1*2 fiber coupler, for being divided into local oscillator light and seed light by described narrow linewidth continuous laser；
Described EDFA Erbium-Doped Fiber Amplifier, is used for amplifying described seed light；
Described circulator, enters optical antenna for transmitting amplified described seed light, and transmits the reception of described optical antenna
The flashlight arrived enters 90 degree of phase controllers；
Described optical antenna, for amplified described seed light is transmitted in air, and receive amplified described continuously
Described flashlight is produced after signal backscatter signal in an atmosphere；
Described 90 degree of phase controllers, for being divided into the first flashlight and secondary signal light by described flashlight, by described local oscillator
Light is divided into the first local oscillator light and the second local oscillator light, described first flashlight and described first local oscillator photo-beat frequency and obtains the first mixing letter
Number, described second local oscillator light obtains the second mixed frequency signal with described secondary signal light beat frequency after initial phase offsets 90 degree；
Described first photodetector, for being converted into first signal of telecommunication by described first mixed frequency signal；
Described second photodetector, for being converted into second signal of telecommunication by described second mixed frequency signal；
Described signal picker, for being converted into the first digital signal and the by described first signal of telecommunication and described second signal of telecommunication
Two digital signal；
Described data processor, for described first digital signal and described second digital signal are done fast Fourier transform,
Then described first digital signal after fast Fourier transform and described second digital signal are done orthogonal processing, calculate
Obtain the velocity amplitude of radially wind speed and judge the direction of radially wind speed.
Radar system the most according to claim 5, it is characterised in that described 90 degree of phase controllers include:
First spectroscope connects the first frequency mixer and 90-degree phase shifter；
Described 90-degree phase shifter connects the second frequency mixer；
Second spectroscope connects described first frequency mixer and described second frequency mixer；
Described first spectroscope, for being divided into the first local oscillator light and the second local oscillator light by described local oscillator light；
Described second spectroscope, for being divided into the first flashlight and secondary signal light by described flashlight；
Described 90-degree phase shifter, for offseting 90 degree by the second local oscillator light in initial phase；
Described first frequency mixer, for described first flashlight and described first local oscillator photo-beat frequency, obtaining the first mixed frequency signal.
Described second frequency mixer, for described second local oscillator light initial phase offset after 90 degree with described secondary signal photo-beat
Frequently, the second mixed frequency signal is obtained.
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