CN107807367B - A kind of coherent wind laser radar apparatus - Google Patents
A kind of coherent wind laser radar apparatus Download PDFInfo
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- CN107807367B CN107807367B CN201711069318.5A CN201711069318A CN107807367B CN 107807367 B CN107807367 B CN 107807367B CN 201711069318 A CN201711069318 A CN 201711069318A CN 107807367 B CN107807367 B CN 107807367B
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- 230000001427 coherent effect Effects 0.000 title claims abstract description 23
- 230000010355 oscillation Effects 0.000 claims abstract description 36
- 230000035559 beat frequency Effects 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 7
- 239000005427 atmospheric aerosol Substances 0.000 claims abstract description 6
- 239000000835 fiber Substances 0.000 claims description 31
- 230000003287 optical effect Effects 0.000 claims description 10
- 239000013307 optical fiber Substances 0.000 claims description 10
- 230000010287 polarization Effects 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000004615 ingredient Substances 0.000 claims description 3
- KWMNWMQPPKKDII-UHFFFAOYSA-N erbium ytterbium Chemical compound [Er].[Yb] KWMNWMQPPKKDII-UHFFFAOYSA-N 0.000 claims description 2
- 229910052691 Erbium Inorganic materials 0.000 claims 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 7
- 230000001186 cumulative effect Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
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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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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention discloses a kind of coherent wind laser radar apparatus.The device includes: signal generator module, for amplifying processing to multi-wavelength local oscillation signal to generate multiwavelength laser signal；Signal transmitting and receiving module is scattered back the echo-signal come by atmospheric aerosol particle after multiwavelength laser signal is emitted in atmosphere for emitting the multiwavelength laser signal of signal generator module generation and receiving, wherein echo-signal carries wind speed information；Signal processing module, it is coupled to signal generator module and signal transmitting and receiving module, after carrying out beat frequency processing to echo-signal according to multi-wavelength local oscillation signal to generate multiple frequency shift signals, wind speed retrieval is carried out to obtain wind speed information according to multiple frequency shift signals after cumulative.By the above-mentioned means, the present invention can be improved the output power of laser signal in laser radar apparatus, so as to improve the signal-to-noise ratio of laser radar apparatus echo-signal, and then achieve the purpose that the detection performance for improving laser radar apparatus.
Description
Technical field
This application involves field of radar, more particularly to a kind of coherent wind laser radar apparatus.
Background technique
Atmospheric wind information is an important resource, and field of renewable energy wind can be improved in accurate atmospheric wind measurement
Can utilization rate, improve climate model establish accuracy, enhance aircraft landing when safety, wind-powered electricity generation, aerospace,
The fields such as weather meteorology, military affairs suffer from very important researching value.
The means of wind field information measurement are broadly divided into passive type and active two major classes, and traditional passive measurement device has
Airspeedometer, wind vane and sonde etc., active type measure device have anemometry laser radar, microwave radar and survey sound of the wind radar etc..
Wherein, anemometry laser radar compared with traditional instrument for wind measurement have higher spatial and temporal resolution, can rapid survey wind field information,
Important means as Wind field measurement.
In the prior art, anemometry laser radar includes at least laser source and optic fiber amplifying module, wherein laser source is general
For the laser of Single wavelength.In actual use, when laser signal of the optic fiber amplifying module to Single wavelength amplifies,
Due to the narrow linewidth of Single wavelength laser signal, it is easy to appear the nonlinear effect of optic fiber amplifying module, and then will limit laser
The output power of middle Single wavelength laser signal, to substantially reduce the detection performance of laser radar.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of coherent wind laser radar apparatus, can be improved laser thunder
Up to the output power of middle laser signal, to improve the detection performance of laser radar.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: a kind of coherent wind laser thunder is provided
Up to device, which includes: signal generator module, amplifies processing to multi-wavelength local oscillation signal for root to generate multi-wavelength
Laser signal；Signal transmitting and receiving module, for emitting the multiwavelength laser signal of signal generator module generation and receiving multi-wavelength
Laser signal is scattered back next echo-signal by atmospheric aerosol particle after being emitted in atmosphere, wherein echo-signal carries wind
Fast information；Signal processing module is coupled to signal generator module and signal transmitting and receiving module, for according to multi-wavelength local oscillation signal pair
After echo-signal carries out beat frequency processing to generate multiple frequency shift signals, wind speed retrieval is carried out according to multiple frequency shift signals after cumulative
To obtain wind speed information.
The beneficial effects of the present invention are: coherent wind laser radar apparatus of the invention passes through transmitting multiwavelength laser letter
Number, it can be improved the output power of laser signal in laser radar, so as to improve the signal-to-noise ratio of laser radar echo signal,
And then achieve the purpose that the detection performance for improving laser radar.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the coherent wind laser radar apparatus of first embodiment of the invention；
Fig. 2 is the structural schematic diagram of the coherent wind laser radar apparatus of second embodiment of the invention；
Fig. 3 is the structural schematic diagram of fiber amplifier in coherent wind laser radar apparatus shown in Fig. 2；
Fig. 4 is the structural schematic diagram of signal transmitting and receiving module in coherent wind laser radar apparatus shown in Fig. 2；
Fig. 5 is the structural schematic diagram of the coherent wind laser radar apparatus of third embodiment of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that the described embodiments are merely a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is the structural schematic diagram of the coherent wind laser radar apparatus of first embodiment of the invention.As shown in Figure 1, should
Device 100 includes signal generator module 11, signal transmitting and receiving module 12 and signal processing module 13.
Signal generator module 11 is used to amplify multi-wavelength local oscillation signal processing to generate multiwavelength laser signal.
Signal transmitting and receiving module 12 is coupled to signal generator module 11, for emitting the multi-wavelength of the generation of signal generator module 11
Laser signal and reception multiwavelength laser signal, which are scattered back the echo come by atmospheric aerosol particle after being emitted in atmosphere, to be believed
Number, wherein echo-signal carries wind speed information；
Signal processing module 13 is coupled to signal generator module 11 and signal transmitting and receiving module 12, for according to multi-wavelength local oscillator
After signal carries out beat frequency processing to echo-signal to generate multiple frequency shift signals, wind is carried out according to multiple frequency shift signals after cumulative
Fast inverting is to obtain wind speed information.
Fig. 2 is the structural schematic diagram of the coherent wind laser radar apparatus of second embodiment of the invention.As shown in Fig. 2, should
Device 200 includes signal generator module 21, signal transmitting and receiving module 22 and signal processing module 23.
Signal generator module 21 is used to amplify multi-wavelength local oscillation signal processing to generate multiwavelength laser signal.Its
In, signal generator module 21 includes being sequentially connected laser 211, beam splitter 212 and fiber amplifier 213.Wherein, laser
211 include the multiple seed source An (n=1,2,3 ...) and the first coupler W1 of different wave length.
Specifically, multiple seed source An are connected with the input terminal of corresponding first coupler W1 respectively, the first coupler
The output end of W1 is connect with the input terminal of beam splitter 212, and the first output end of beam splitter 212 is connect with fiber amplifier 213, point
The second output terminal of beam device 212 is connect with signal processing module 23.
The linear polarization that multiple seed source An are respectively used to generate multiple and different wavelength employed in the present embodiment continuously swashs
Light.The wave-length coverage of the linear polarization continuous laser of the output of seed source An employed in the present embodiment is 1.53 μm~1.56 μm.
The seed source An used in the present embodiment is the semiconductor laser of single mode narrow linewidth, distributed feedback laser
(Distributed Feedback Laser, DFB) and Distributed Bragg Reflection laser (Distributed Bragg
One of reflector, DBR), wherein DFB and DBR laser band tail optical fiber export.
Multiple seed source An may include a kind of laser of model namely be all semiconductor laser, Distributed Feedback Laser or
DBR laser also may include the laser of three kinds of different models namely part is semiconductor laser, is partially that DFB swashs
Light device, remainder are DBR laser, and the laser that also may include two kinds of different models is partially for example semiconductor laser
Device, remainder are DBR laser etc..
First coupler W1 employed in the present embodiment is used to carry out multiple linear polarization continuous lasers of different wave length
Coupling is to export multi-wavelength local oscillation signal, wherein multi-wavelength local oscillation signal is continuous laser, is multiple linear polarization continuous lasers
Set.It changes for an angle, the effect of the first coupler W1 is continuously to swash the linear polarization transmitted respectively in multiple seed sources
Light set forms multi-wavelength local oscillation signal to be transmitted in the same transmission channel.In the present embodiment, the first coupler
W1 is fiber coupler.In other embodiments, the coupler of other forms, such as directional coupler, power can also be used
Any one in distributor and various microwave branches device, the application is not specifically limited.
Beam splitter 212 is the Optical devices that light beam is divided into two-beam or multi-beam, is divided employed in the present embodiment
Beam device 212 is fiber optic splitter, is used to the multi-wavelength local oscillation signal that the first coupler W1 is exported being divided into two parts, wherein one
Part is transmitted to fiber amplifier 213 as the transmitting signal of coherent wind laser radar apparatus, another part as be concerned with
The input signal that the echo-signal of windfinding laser radar apparatus carries out beat frequency processing is transmitted to signal processing module 23.
Fiber amplifier 213 is for amplifying multi-wavelength local oscillation signal to be launched to generate multiwavelength laser signal.It please one
And Fig. 3 is referred to, Fig. 3 is the structural schematic diagram of fiber amplifier in coherent wind laser radar apparatus shown in Fig. 2.Such as Fig. 3 institute
Show, fiber amplifier 213 includes third coupler 30, optical fiber 31, pumping source 32 and filter 33, wherein third coupler 30
An input terminal connect with beam splitter 212 to receive multi-wavelength local oscillation signal, another input terminal and pump of third coupler 30
Pu source 32 is connected to receive pumping signal, and the output end of third coupler 30 is connect with the input terminal of optical fiber 31, optical fiber 31
Output end is connect with filter 33.Wherein, optical fiber 31 be Er-doped fiber or erbium ytterbium co-doped fiber, filter 33 be optical filter or
Bragg grating.
In the present embodiment, during amplifying processing to multi-wavelength local oscillation signal using fiber amplifier 213, by
In multi-wavelength local oscillation signal, there are multiple frequency contents, and spectrum generates broadening, so as to increase the increasing of fiber amplifier 213
Benefit, and then obtain the output power of higher multiwavelength laser signal.
Signal transmitting and receiving module 22 is used to emit the multiwavelength laser signal of the generation of signal generator module 21 and receives more waves
Long laser signal is scattered back next echo-signal by atmospheric aerosol particle after being emitted in atmosphere, wherein echo-signal carries
Wind speed information.
It is the structure of signal transmitting and receiving module in coherent wind laser radar apparatus shown in Fig. 2 please also refer to Fig. 4, Fig. 4
Schematic diagram.As shown in figure 4, signal transmitting and receiving module 22 includes the telescope system set gradually along multiwavelength laser signal propagation direction
System 34 and optical beam scanning system 35, wherein telescopic system includes eyepiece and object lens.
Telescopic system 34 can be to emit and receiving coaxial telescopic system, and the focal length of the telescopic system 34 can
It adjusts.Optical beam scanning system 35 can be one of wedge mirror, scanner and Multichannel photoswitch composition, the used finger for changing light beam
To.
Wherein, transmitting signal generator module 21 generate multiwavelength laser signal be output to telescopic system 34 eyepiece,
Object lens are after beam-expanding collimation through 35 directive atmosphere of optical beam scanning system；And the echo-signal come is scattered back by atmospheric aerosol particle
Enter telescopic system 34 after the reception of optical beam scanning system 35, and then exports to signal processing module 23.
Signal processing module 23 is coupled to signal generator module 21 and signal transmitting and receiving module 22, for according to multi-wavelength local oscillator
After signal carries out beat frequency processing to echo-signal to generate multiple frequency shift signals, wind is carried out according to multiple frequency shift signals after cumulative
Fast inverting is to obtain wind speed information.Wherein, signal processing module 23 includes sequentially connected second coupler 231, balance detection
Device 232, Data Acquisition Card 233 and signal processor 234.
Second coupler 231 is for output after being coupled multi-wavelength local oscillation signal and echo-signal to balanced detector
232.Wherein, the second coupler 231 includes first input end, the second input terminal and output end, and the first of the second coupler 231 is defeated
Enter reception multi-wavelength local oscillation signal, the second input terminal of the second coupler 231 after end is connect with the second output terminal of beam splitter 212
Receives echo-signal after being connect with signal transmitting and receiving module 22, the output end of the second coupler 231 connect with balanced detector 232 with
By after coupling multi-wavelength local oscillation signal and echo-signal be sent to balanced detector 232.In the present embodiment, the second coupler
231 be fiber coupler.In other embodiments, the coupler of other forms, such as directional coupler, power can also be used
Any one in distributor and various microwave branches device, the application is not specifically limited.
Balanced detector 232 be used for through the second coupler 231 coupling after multi-wavelength local oscillation signal and echo-signal into
The processing of row beat frequency generates multiple frequency shift signals relevant to wind field information, and then multiple frequency shift signals export after adding up.
Wherein, it is two optical signals that balanced detector 232 is received, and output is an electric signal.
Electric signal that Data Acquisition Card 233 exports balanced detector 232 namely it is cumulative after frequency shift signal be acquired
After export to signal processor 234.
Signal processor 234 handles the frequency shift signal after collected add up, and specifically can be by signal
It manages device 234 and wind speed retrieval is carried out to obtain wind speed information to the frequency shift signal after adding up.Signal processing used by the present embodiment
Device 234 is one of industrial personal computer or embedded platform.Certainly, in other embodiments, model and type can also be used
Signal processor, do not do and further limit herein.
Preferably, coherent wind laser radar apparatus 200 further comprises circulator 24.Wherein, circulator is called isolation
Device, outstanding feature are one-way transmission higher frequency signal energies.It controls electromagnetic wave and transmits along a certain belt direction, this unidirectional biography
The characteristic of defeated higher frequency signal energy, is chiefly used between the output end of high frequency power amplifier and load, plays respective independence, mutually
The effect of isolation.
In the present embodiment, circulator 24 includes first end, second end and third end, and the first end of circulator 24 connects letter
The output end of the fiber amplifier 213 of number generation module 21, second end connection signal transceiver module 22, at the connection signal of third end
Manage the second input terminal of the second coupler of module 23.Wherein, the multiwavelength laser signal input that signal generator module 21 generates
It is exported by second end to signal transmitting and receiving module 22, the received echo-signal of signal transmitting and receiving module 22 after to the first end of circulator 24
It is input to after the second end of circulator 24 by three-polar output to signal processing module 23.
The working principle of windfinding laser radar apparatus 200 is briefly described below, specific as follows:
The linear polarization continuous laser that seed source An similar in multiple wavelength is generated is formed after the first coupler W1 to be contained
Multi-wavelength local oscillation signal is divided into two parts, a part of multi-wavelength sheet by the multi-wavelength local oscillation signal of multi-frequency ingredient, beam splitter 212
Vibration signal is input to fiber amplifier 213 and amplifies processing to obtain multiwavelength laser signal, a part of multi-wavelength local oscillator letter
Number being input to the second coupler 231 carries out subsequent beat frequency processing.
Wherein, during fiber amplifier 213 amplifies, because there are multiple frequencies for the multi-wavelength local oscillation signal of input
Ingredient, spectrum generate broadening, to inhibit the peak-to-peak value power into the laser signal of fiber amplifier 213, can effectively mention
The threshold value of high Brillouin scattering increases the gain of fiber amplifier 213, obtains the output work of higher multiwavelength laser signal
Rate.
Multiwavelength laser signal is swashed multi-wavelength by 24 entering signal transceiver module 22 of circulator, signal transmitting and receiving module 22
Into atmosphere, the aerosol particle and multiwavelength laser signal moved in atmosphere collides optical signal launch, generates and carries wind
The echo-signal of fast information, echo-signal continue to be transmitted to the second coupler through circulator 24 after being received by signal transmitting and receiving module 22
231.It wherein, include the frequency shift signal of multiple and different frequency contents in echo-signal.
Second coupler 231 exports after being coupled multi-wavelength local oscillation signal and echo-signal to balanced detector 232,
Balanced detector 232 carries out beat frequency processing to multi-wavelength local oscillation signal and echo-signal, generates relevant to wind field information multiple
After frequency shift signal, and then multiple frequency shift signals are subjected to accumulation process and pass to Data Acquisition Card 233 and signal processor
234, signal processor 234 is according to the corresponding relationship between the velocity amplitude of frequency shift signal and radial wind speed after adding up, by letter
The velocity amplitude of radial wind speed is obtained after number processing.
Wherein, in balanced detector 232, due to being detected using multi-wavelength, the frequency shift signal that each wavelength generates is through clapping
It adds up after frequency, the signal-to-noise ratio of echo-signal, and then the detection performance of improving laser radar can be effectively improved.
Fig. 5 is the structural schematic diagram of the coherent wind laser radar apparatus of third embodiment of the invention.As shown in figure 5, Fig. 5
Shown in coherent wind laser radar apparatus 300 and the difference of coherent wind laser radar apparatus 200 shown in Fig. 2 be: Fig. 5
Shown in signal generator module 21 further comprise acousto-optic modulator 41, wherein acousto-optic modulator 41 is serially connected in beam splitter 212
Between first output end and fiber amplifier 213.
Acousto-optic modulator 41 is used to receive pulse chopping signal and multi-wavelength local oscillation signal, and according to pulse chopping signal pair
Multi-wavelength local oscillation signal is modulated processing, to generate multiwavelength laser signal and be transferred to fiber amplifier 213.It is specific next
It says, the multi-wavelength local oscillation signal of continuous laser is modulated into pulse laser by pulse chopping signal by acousto-optic modulator 41, simultaneously
Fiber amplifier 213 is input to after forming multiwavelength laser signal after generation shift frequency.That is, in the present embodiment, more waves
Long laser signal is pulse laser.
The beneficial effects of the present invention are: coherent wind laser radar apparatus of the invention passes through transmitting multiwavelength laser letter
Number, it can be improved the output power of laser signal in laser radar, so as to improve the signal-to-noise ratio of laser radar echo signal,
And then achieve the purpose that the detection performance for improving laser radar.
Mode the above is only the implementation of the present invention is not intended to limit the scope of the invention, all to utilize this
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field is included within the scope of the present invention.
Claims (6)
1. a kind of coherent wind laser radar apparatus, which is characterized in that described device includes:
Signal generator module, for amplifying processing to multi-wavelength local oscillation signal to generate multiwavelength laser signal；
Signal transmitting and receiving module, for emitting described in the multiwavelength laser signal and reception that the signal generator module generates
Multiwavelength laser signal is scattered back next echo-signal by atmospheric aerosol particle after being emitted in atmosphere, wherein the echo
Signal carries wind speed information；
Signal processing module is coupled to the signal generator module and the signal transmitting and receiving module, for according to the multi-wavelength
After local oscillation signal carries out beat frequency processing to the echo-signal to generate multiple frequency shift signals, according to multiple frequencies after adding up
Shifting signal carries out wind speed retrieval to obtain the wind speed information；
Wherein, the signal generator module includes sequentially connected laser, beam splitter and fiber amplifier, wherein described to swash
Light device includes multiple seed sources of different wave length and the first coupler for connecting with the multiple seed source；
Wherein, the multiple seed source is connected with the input terminal of corresponding first coupler respectively, first coupler
Output end connect with the input terminal of the beam splitter, the first output end of the beam splitter is connect with the fiber amplifier,
The second output terminal of the beam splitter is connect with the signal processing module, wherein the output end of first coupler exports
The multi-wavelength local oscillation signal；
Wherein, the wave-length coverage of the single-frequency laser of the seed source output is 1.53 μm~1.56 μm；
Wherein, the linear polarization continuous laser that the seed source generates similar in multiple wavelength is formed after first coupler
The multi-wavelength local oscillation signal is divided into two parts by the multi-wavelength local oscillation signal containing multi-frequency ingredient, the beam splitter, and one
Point multi-wavelength local oscillation signal is input to the fiber amplifier and amplifies processing to obtain the multiwavelength laser signal,
A part of multi-wavelength local oscillation signal is input to the signal processing module to carry out beat frequency processing；
Wherein, the multi-wavelength local oscillation signal is continuous laser, is the set of multiple linear polarization continuous lasers；
Wherein, the fiber amplifier includes third coupler, optical fiber, pumping source and filter, wherein the optical fiber is to mix
Erbium optical fiber or erbium ytterbium co-doped fiber, the filter are optical filter or Bragg grating；
Wherein, an input terminal of the third coupler is connect to receive the multi-wavelength local oscillation signal with beam splitter, described
Another input terminal of third coupler is connect to receive pumping signal, the output end of the third coupler with the pumping source
It is connect with the input terminal of the optical fiber, the output end of the optical fiber is connect with the filter.
2. the apparatus according to claim 1, which is characterized in that described device further comprises circulator, the circulator
Including first end, second end and third end, the first end connection signal generator module of the circulator, described second
End connects the signal transmitting and receiving module, and the third end connects the signal processing module；
Wherein, the multiwavelength laser signal that the signal generator module generates is input to the first end of the circulator
It is exported afterwards by the second end to the signal transmitting and receiving module, the received echo-signal of signal transmitting and receiving module is input to
By the three-polar output to the signal processing module after the second end of the circulator.
3. the apparatus according to claim 1, which is characterized in that the signal generator module further comprises acousto-optic modulation
Device, the acousto-optic modulator are serially connected between the first output end of the beam splitter and the fiber amplifier.
4. the apparatus according to claim 1, which is characterized in that the seed source is semiconductor laser, distributed Feedback
One of laser and Distributed Bragg Reflection laser.
5. the apparatus according to claim 1, which is characterized in that the signal processing module includes sequentially connected second coupling
Clutch, balanced detector, Data Acquisition Card and signal processor, wherein the first input end of second coupler is for connecing
Receive the multi-wavelength local oscillation signal, the second input terminal of second coupler is for receiving the echo-signal, and described second
The output end of coupler is connect with the balanced detector.
6. the apparatus according to claim 1, which is characterized in that the signal transmitting and receiving module includes along the multiwavelength laser
The telescopic system and optical beam scanning system that signal propagation direction is set gradually.
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| CN113253301B (en) * | 2021-07-05 | 2021-10-01 | 中国人民解放军国防科技大学 | Multi-frequency pulse laser radar signal processing method and wind measuring radar system |
| CN113721221A (en) * | 2021-08-31 | 2021-11-30 | 深圳市镭神智能系统有限公司 | Frequency modulation continuous wave laser radar |
| CN115453574B (en) * | 2022-10-27 | 2023-04-25 | 南京信息工程大学 | Multi-functional laser radar of atmosphere multiparameter detection |
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| US5170218A (en) * | 1991-03-29 | 1992-12-08 | Raytheon Company | Apparatus and method for detecting wind direction |
| CN104269732B (en) * | 2014-10-24 | 2017-02-15 | 东南大学 | Method and device for generating microwave signal based on Brillouin amplification multi-wavelength laser device |
| CN105572690B (en) * | 2016-03-07 | 2018-01-30 | 中国科学技术大学 | A kind of double frequency coherent wind laser radar based on the continuous light EOM modulation of single-frequency |
| CN205608187U (en) * | 2016-03-17 | 2016-09-28 | 四川知周科技有限责任公司 | Relevant doppler's laser wind finding radar of multi -wavelength light beam synthesis |
| CN106940444B (en) * | 2017-02-27 | 2019-09-13 | 南京红露麟激光雷达科技有限公司 | Coherent Doppler wind-observation laser radar based on microwave differential gain |
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