CN108802425A - A kind of airborne measuring wind speed laser radar system - Google Patents
A kind of airborne measuring wind speed laser radar system Download PDFInfo
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- CN108802425A CN108802425A CN201810838790.9A CN201810838790A CN108802425A CN 108802425 A CN108802425 A CN 108802425A CN 201810838790 A CN201810838790 A CN 201810838790A CN 108802425 A CN108802425 A CN 108802425A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/26—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
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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
Abstract
The present invention relates to a kind of airborne measuring wind speed laser radar systems comprising narrow-linewidth laser light-pulse generator module, radar transmit-receive optical antenna module and signal receiving processing module；The narrow-linewidth laser light-pulse generator module includes narrow linewidth seed light source, optical fiber prime amplifier, acousto-optic modulator, C-band boosting semiconductor optical amplifier and optical fiber main amplifier；The radar transmit-receive optical antenna module connects narrow-linewidth laser light-pulse generator module comprising optical fiber circulator, photoswitch and optical antenna；The signal receiving processing module is separately connected narrow-linewidth laser light-pulse generator module and radar transmit-receive optical antenna module；The signal receiving processing module includes optical fiber adjustable attenuator, optical-fiber bundling device, balance photodetector, signal processing circuit and embedded computer.Structure of the invention reasonable design, use is reliable and stable, and real-time air speed data can be provided for airborne air data computer, improves aeroplane performance, ensures flight safety.
Description
Technical field
The invention belongs to laser radar detection technical fields, in particular to a kind of airborne measuring wind speed laser thunder
Up to system.
Background technology
If aircraft meets with strong air-flow in flight course, prodigious threat, forward direction can be caused big to flight safety
Gas turbulent flow and Transverse Shear wind cutting are one of the main reason for causing flight air crash.Therefore, right during aircraft flight
The real-time measurement of wind field and the air-flow variation of air is the vital task requirement in flight course.
One-point measurement and telemetering two ways can be divided into measurement distance by being installed on the equipment of airborne measurements wind speed.
In the equipment of one-point measurement wind speed, traditional airborne anemometry is pitot, low for stratosphere low latitude air tightness
Dynamic flight environment of vehicle, pressure change caused by dynamic pressure often can not be measured accurately.New Fighter uses embedded big
Gas data system, although can replace traditional pitot, for high-altitude fly at low speed device, pressure transducer range and
Precision is not met by requirement.Hot-wire, hot diaphragm type anemobiagraph mainly expose thermo-responsive temperature in a fluid to the open air by detection
It dissipates and calculates wind speed with energy transfer rate, but both anemobiagraphs are limited by single ended signal saturation, measuring wind speed
Range is not high and temperature measures and needs certain response time.Although micro-pressure sensor have high sensitivity, it is light-weight,
The advantages that corrosion-resistant, but material itself, there are temperature drift problems, running hours need to correct, and also rate accuracy is not
It is high.Doppler effect of the ultrasonic velocity meter based on relative motion measures the propagation time in ultrasonic wave direction, can obtain suitable
Wind or the spread speed of contrary wind, precision is higher, but the transmission and receiving device due to sound wave have blocking to wind in an atmosphere
When effect, especially wind send and receive in same direction with sound wave, larger error is easily caused, and complicated, no
Easily realized in floating platform.It is that air-flow is easy to be influenced by aircraft shape that fixed point anemometry, which also has common disadvantage,
It changes, needs to be calibrated according to specific aircraft shape and equipment installation position.
The Typical Representative of wind speed remote-measuring equipment is LDV technique, has fast precision height, response, wide coverage, survey
The advantages that amount result is not influenced by carrying platform.Mainly there are the countries such as the U.S., Japan, France to report at present and uses airborne laser
The example of radar telemetering aircraft wind speed.
Invention content
For the problems in above-mentioned background technology, the present invention proposes that one kind is reasonable in design, and use is reliable and stable, can be
Airborne air data computer provides real-time air speed data, improves aeroplane performance, ensures that the airborne measuring wind speed of flight safety swashs
Optical detection and ranging system.
Technical scheme is as follows：
Above-mentioned airborne measuring wind speed laser radar system, including narrow-linewidth laser light-pulse generator module, radar transmit-receive light
Learn Anneta module and signal receiving processing module；
The narrow-linewidth laser light-pulse generator module include narrow linewidth seed light source, optical fiber prime amplifier, acousto-optic modulator,
C-band boosting semiconductor optical amplifier and optical fiber main amplifier；The output end of the narrow linewidth seed light source connects the optical fiber
The input terminal of prime amplifier；The output end of the optical fiber prime amplifier connects the input terminal of the acousto-optic modulator；The acousto-optic
The output end of modulator connects the input terminal of the C-band boosting semiconductor optical amplifier；The C-band boosting semiconductor light is put
The output end of big device connects the input terminal of the optical fiber main amplifier；
The radar transmit-receive optical antenna module connects the narrow-linewidth laser light-pulse generator module comprising fiber annular
Device, photoswitch and optical antenna；The input terminal of the optical fiber circulator connects the output end of the optical fiber main amplifier；The light
The input terminal of switch connects the one of output end of the optical fiber circulator by optical fiber, and the output end of the photoswitch connects institute
State optical antenna；
The signal receiving processing module is separately connected the narrow-linewidth laser light-pulse generator module and radar transmit-receive optics
Anneta module；The signal receiving processing module includes optical fiber adjustable attenuator, optical-fiber bundling device, balance photodetector, letter
Number processing circuit and embedded computer；The input terminal of the optical fiber adjustable attenuator connects the another of the optical fiber prime amplifier
Output end；The input terminal of the optical-fiber bundling device be separately connected the optical fiber circulator another output end and the optical fiber it is adjustable
The output end of attenuator；The input terminal of the balance photodetector connects the output end of the optical-fiber bundling device；The signal
The input terminal of processing circuit connects the output end of the balance photodetector, and the output end of the signal processing circuit is connected to
The embedded computer.
The airborne measuring wind speed laser radar system, wherein：It is defeated that 1.5 mu m wavebands can be used in the narrow linewidth seed light source
Go out any one in the single mode narrow linewidth semiconductor laser, DBR/DFB optical fiber lasers, solid state laser of continuous laser；
The spectral line width of the narrow linewidth seed light source is less than 15kHz, and polarization state is linear polarization, single-mode polarization maintaining fiber output, output light
1~100mW of power.
The airborne measuring wind speed laser radar system, wherein：The optical fiber prime amplifier is put using single-mode polarization maintaining fiber
Big device or double clad single-mode polarization maintaining fiber amplifier, then using by single-mode polarization maintaining fiber amplifier and double clad single mode polarization-maintaining
The multi-stage fiber amplifier that fiber amplifier combination is constituted.
The airborne measuring wind speed laser radar system, wherein：The modulation rising edge of a pulse of the acousto-optic modulator is less than
100ns, upper shift frequency 80MHz；The beam modulation that the acousto-optic modulator exports the optical fiber prime amplifier is overall with 500ns's
Pulsed light, pulse recurrence frequency 10kHz.
The airborne measuring wind speed laser radar system, wherein：The C-band boosting semiconductor optical amplifier is band polarization-maintaining
Optical fiber pigtail is used and is pumped with the electric pulse of input pulse phototiming；The optical fiber main amplifier is double clad polarization maintaining optical fibre
Amplifier.
The airborne measuring wind speed laser radar system, wherein：The machine with polarization maintaining fiber pigtail can be used in the photoswitch
Any one in tool formula photoswitch, mems photoswitches, magneto-optic shutter；Optical fiber between the photoswitch and optical fiber circulator connects
It connects by the way of welding.
The airborne measuring wind speed laser radar system, wherein：The optical antenna is the identical optics day of three structures
Line and it is all made of monolithic aspherical mirror, the clear aperture of the aspherical mirror is 50mm, focal length 180mm；Three optics
Antenna is directed toward different orientation, and output beam all focuses at respectively 200 meters of front, and the Rayleigh range of focal beam spot is 30 meters.
The airborne measuring wind speed laser radar system, wherein：The signal processing circuit only acquires and handles the light
Learn the backscatter signal of particulate in antenna focusing hot spot Rayleigh range region；The sampling frequency of the signal processing circuit
Rate is 400MHz, precision 14bit.
The airborne measuring wind speed laser radar system, wherein：The signal acquisition process flow of the signal processing circuit
It is as follows：
(1) according to the repetition rate of laser pulse be 10KHz it is found that carry out signal acquisition trigger signal frequency it is same
For 10KHz, the time interval between triggering twice is 100 μ s；
(2) after receiving trigger signal, analog signal is carried out high-speed digital signal conversion by the signal processing circuit
After acquire, sampling number be 200 points；
(3) it after sampling, by sampled data zero padding to Fourier transform is done after 1024 points, seeks power spectrum and carries out work(
Rate spectrum is cumulative, until being added to stipulated number, otherwise continues waiting for trigger signal, repeats step (2)-(3)；
(4) it adds up and continues subsequent processing after completing, Maximum-likelihood estimation is used to preceding cumulative power spectrum data
Algorithm obtains corresponding frequency, calculates corresponding radial wind speed, and radial air speed data is exported to the embedded computer；
(5) switching emits the optical antenna, repeats step (2)-(5).
The airborne measuring wind speed laser radar system, wherein：Sampled point will remove signal saturation in the correction (2)
Part, i.e., the data acquired every time are to postpone certain time after receiving trigger signal and be with 200 meters of focal spot data
200 point datas at center.
Advantageous effect：
The airborne measuring wind speed laser radar system of the present invention is reasonable in design, is amplified using semiconductor pulse image intensifer
Pulsed light, while increasing the modulation depth of pulse, can make to only use an acousto-optic modulator in system can solve pulse and let out
The problem of dew, can also reduce cost while reducing laser volume；Meanwhile emission pulse laser, light beam are poly- through optical antenna
Coke forms Rayleigh range region at hundreds of meters of front, and system only receives and handle the atmospheric aerosol in the region laser beam
Backscatter signal；The high-peak power advantage for making full use of pulse laser, obtains strong echo-signal, is suitble in high aerosol
It is used in the thin environment of density.
Description of the drawings
Fig. 1 is the structure principle chart of the airborne measuring wind speed laser radar system of the present invention；
Fig. 2 is the optical antenna distribution directing mode figure of the airborne measuring wind speed laser radar system of the present invention.
Specific implementation mode
As shown in Figure 1, 2, the airborne measuring wind speed laser radar system of the present invention, including narrow-linewidth laser light-pulse generator module
1, radar transmit-receive optical antenna module 2 and signal receiving processing module 3.
The narrow-linewidth laser light-pulse generator module 1 includes narrow linewidth seed light source 11, optical fiber prime amplifier 12, acousto-optic modulation
Device 13, C-band boosting semiconductor optical amplifier 14 and optical fiber main amplifier 15.
The input terminal of the output end connection optical fiber prime amplifier 12 of the narrow linewidth seed light source 11；Wherein, the narrow linewidth kind
Single mode narrow linewidth semiconductor laser, the DBR/DFB optical fiber lasers of 1.5 mu m wavebands output continuous laser can be used in sub-light source 11
With any one in solid state laser；The spectral line width of the narrow linewidth seed light source 11 is less than 15kHz, and polarization state is that line is inclined
It shakes, single-mode polarization maintaining fiber output, 1~100mW of Output optical power.
The input terminal of the output end connection acousto-optic modulator 13 of the optical fiber prime amplifier 12；Wherein, the optical fiber prime amplifier
12 use single-mode polarization maintaining fiber amplifier or double clad single-mode polarization maintaining fiber amplifiers, then using being put by single-mode polarization maintaining fiber
The multi-stage fiber amplifier that big device and double clad single-mode polarization maintaining fiber amplifier combination are constituted.
The input terminal of the output end connection C-band boosting semiconductor optical amplifier 14 of the acousto-optic modulator 13；Wherein, the sound
The modulation rising edge of a pulse of optical modulator 13 is less than 100ns, upper shift frequency 80MHz, the light beam that optical fiber prime amplifier 12 is exported
It is modulated to the pulsed light of overall with 500ns, pulse recurrence frequency 10kHz.
The input terminal of the output end connection optical fiber main amplifier 15 of the C-band boosting semiconductor optical amplifier 14；Wherein, should
C-band boosting semiconductor optical amplifier 14 is band polarization maintaining fiber pigtail, is pumped using with the electric pulse of input pulse phototiming.
The optical fiber main amplifier 15 is double clad polarization maintaining optical fibre amplifier.
Wherein, which receives the linear polarization continuous laser of 11 output of narrow linewidth seed light source, the optical fiber
Prime amplifier 12 will be transferred to acousto-optic modulator 13 after beam treatment, be exported optical fiber prime amplifier 12 by acousto-optic modulator 13
Beam modulation is pulsed light, which is transferred to C-band boosting semiconductor optical amplifier by modulated pulsed light
14, it is further amplified by C-band boosting semiconductor optical amplifier 14 and modulating light pulse, the C-band boosting semiconductor optical amplification
The optical pulse propagation for being further amplified and modulating to optical fiber main amplifier 15, pulsed light is carried out by optical fiber main amplifier 15 by device 14
Power amplification exports.
The radar transmit-receive optical antenna module 2 connects the narrow-linewidth laser light-pulse generator module 1 comprising optical fiber circulator
21, photoswitch 22 and optical antenna 23.
The output end of the input terminal connection optical fiber main amplifier 15 of the optical fiber circulator 21.
For the photoswitch 22 tool there are one input terminal and multiple output ends, the input terminal of the photoswitch 22 connects light by optical fiber
The output end of 21 one of output end of fine circulator, the photoswitch 22 connects three optical antennas 23；Wherein, the photoswitch 22
Can be any one in the mechanical optical switch with polarization maintaining fiber pigtail, mems photoswitches and magneto-optic shutter；The photoswitch
22 can be controlled by electric signal input light beam is switched to and arbitrarily is exported all the way, when laser radar work, switch light beam successively
Launched from each output end of photoswitch 22 by corresponding optical antenna 23, is then moved in circles；Meanwhile the photoswitch
Optical fiber between 22 and optical fiber circulator 21 connects by the way of welding, avoids the reflected light using fiber end face when connector
Interfere local oscillator light.
Three 23 structures of optical antenna are identical, all use monolithic aspherical mirror, aspherical mirror clear aperture 50mm, focal length
180mm；Wherein, three optical antennas 23 are directed toward different orientation, and output beam is all focused at respectively 200 meters of front, focused
The Rayleigh range of hot spot is 30 meters.
The signal receiving processing module 3 is separately connected narrow-linewidth laser light-pulse generator module 1 and radar transmit-receive optical antenna
Module 2, the signal receiving processing module 3 include optical fiber adjustable attenuator 31, optical-fiber bundling device 32, balance photodetector 33,
Signal processing circuit 34 and embedded computer 35.
The optical fiber adjustable attenuator 31 is used to adjust the output local oscillation optical power of optical fiber prime amplifier 12, input terminal connection
12 another output end of optical fiber prime amplifier of the narrow-linewidth laser light-pulse generator module 1.
The optical-fiber bundling device 32 uses 2 × 2 optical-fiber bundling devices, input terminal to be separately connected the radar transmit-receive optical antenna mould
The output end of the optical fiber circulator 21 another output end and optical fiber adjustable attenuator 31 of block 2.
The input terminal of the balance photodetector 33 connects two output ends of the optical-fiber bundling device 32.
The output end of the input terminal connection balance photodetector 33 of the signal processing circuit 34, the signal processing circuit 34
Output end be connected to embedded computer 35；Wherein, 34 acquisitions of the signal processing circuit and three optical antennas 23 of processing
The backscatter signal of particulate in focal beam spot Rayleigh range region；The sample frequency of the signal processing circuit 34 is
400MHz, precision 14bit, using FPGA (field programmable gate array) programmed process signal.
Wherein, the echo-signal received for each optical antenna 23, can determine according to pulse width 500ns at signal
The reason 34 single signal sampling time of circuit is 500ns, is 400MHz according to sample frequency, it may be determined that unitary sampling points are 200
Point；By the 200 point data zero paddings sampled every time to 1024 points, windowed function carries out Fast Fourier Transform, then calculates power
It composes, the spectral resolution after progress FFT transform is less than 0.4MHz, and corresponding velocity accuracy is less than 0.3m/s；Due to passing through work(
Rate spectrum accumulation algorithm can improve rate accuracy, and carrying out 5000 times to the power spectrum signal that single optical antenna 23 measures adds up,
The velocity accuracy finally realized is less than 0.1m/s.
The signal acquisition process flow of the signal processing circuit 34 is as follows：
(1) it is 10KHz (or 5kHz, 8kHz etc.) according to the repetition rate of laser pulse it is found that carrying out signal acquisition
The frequency of trigger signal is similarly 10KHz, and the time interval between triggering twice is 100 μ s；
(2) after receiving trigger signal, after analog signal is carried out high-speed digital signal conversion by signal processing circuit 34
Acquisition, sampling number are 200 points；
(3) after sampling, by sampled data zero padding to doing Fourier transform after 1024 points；Power spectrum is sought, and is carried out
Power spectrum is cumulative, continues to handle in next step if accumulative frequency reaches defined 5000 numbers, otherwise continues waiting for triggering
Signal repeats step (2)-(3)；
(4) it adds up and continues subsequent processing after completing, Maximum-likelihood estimation is used to preceding cumulative power spectrum data
Algorithm obtains corresponding frequency, calculates corresponding radial wind speed, and radial air speed data is exported to embedded computer 35；
(5) switching transmitting optical antenna 23, repeats step (2)-(5).
Wherein, due to the reflection of 23 eyeglass of optical fiber head end face reflection and optical antenna, optical signal will cause to balance photoelectricity
Detector 33 be saturated, be accordingly used in calculate sampled point to remove signal saturation part, so the data acquired every time be from
Postpone certain time after receiving trigger signal and with 200 point datas of 200 meters of focal spot data grid technologies.
As shown in Fig. 2, being+X-direction with aircraft heading, aircraft ventral is oriented to+Z-direction, establishes right
Hand coordinate system；Three optical antennas 23 be circumferentially spaced 120 ° it is uniformly distributed, be all 15 ° with+X-direction angle, be directed toward different sides
Position.
It arranges in optical antenna as shown in Figure 2, embedded computer 35 is respectively received signal processing circuit
The radial wind speed of 34 three 23 pointing directions of optical antenna sent solves wind of each radial wind speed in body reference axis respectively
Fast component divides in the enterprising rower amount summation of each reference axis to get to respective wind speed on airframe coordinate X, Y, Z axis direction
Amount.
Working principle of the present invention is as follows：
The low-power laser that narrow linewidth seed light source 11 exports is amplified by optical fiber prime amplifier 12, optical fiber prime amplifier 12
It is divided into two-way output, exports the light of fraction power all the way as local oscillation signal, in addition export the light quilt of most of power all the way
Acousto-optic modulator 13 is modulated to pulsed light, while generating tens of megahertzs of shift frequency, and pulsed light passes through C-band boosting semiconductor light
Amplifier 14 amplifies, while increasing impulse modulation depth, and last laser passes through defeated after the progress power amplification of optical fiber main amplifier 15
Go out；Output beam is incident from 21 1 input port of optical fiber circulator, is emitted through two output ports, is then switched by photoswitch 22
The optical antenna 23 being differently directed through three after beam direction is launched；Each optical antenna 23 projects forwards to be focused together
Measuring beam, it is hundreds of meters that the light beam of transmitting is focused the same distance distance by each optical antenna 23；It is molten by the gas in air
The echo-signal that glue scattering laser in the Rayleigh range area that light beam focuses generates Doppler frequency shift is returned along transmitting light path, echo
Output of the signal from optical fiber circulator 21；Echo-signal is incident on balance after closing beam by 2 × 2 optical-fiber bundling devices 32 with local oscillator light
On photodetector 33, heterodyne signal is generated, signal processing circuit 34 is sent into and extracts Doppler frequency, obtains the radial speed of each light beam
Spend information；After the radial velocity for measuring each light beam respectively, it is calculated by Wind-field Retrieval algorithm in embedded computer 35
Wind field information.
Structure of the invention reasonable design, use is reliable and stable, and real-time wind speed number can be provided for airborne air data computer
According to raising aeroplane performance ensures flight safety.
Above technical scheme measures aerial aerosol backscatter signal using pulsed light fixed-focus, passes through more optical antennas
It is differently directed and measures radial wind speed in all directions, a kind of airborne measuring wind speed radar may be implemented after Wind-field Retrieval, be applicable to
The application fields such as the true air speed measurement of aircraft.
According to above-described embodiment, the present invention can be realized well.It is worth noting that before based on above-mentioned design principle
It puts, to solve same technical problem, even if some made on architecture basics disclosed in this invention are without substantive
Change or polishing, such as increase optical antenna quantity, change optical antenna clear aperture, focus different distance change, it is used
Technical solution essence still as the present invention, therefore it should also be as within the scope of the present invention.
Claims (10)
1. a kind of airborne measuring wind speed laser radar system, it is characterised in that：The radar system includes narrow-linewidth laser pulse
Light source module, radar transmit-receive optical antenna module and signal receiving processing module；
The narrow-linewidth laser light-pulse generator module includes narrow linewidth seed light source, optical fiber prime amplifier, acousto-optic modulator, C waves
Section boosting semiconductor optical amplifier and optical fiber main amplifier；The output end of the narrow linewidth seed light source connects the predispersed fiber and puts
The input terminal of big device；The output end of the optical fiber prime amplifier connects the input terminal of the acousto-optic modulator；The acousto-optic modulation
The output end of device connects the input terminal of the C-band boosting semiconductor optical amplifier；The C-band boosting semiconductor optical amplifier
Output end connect the input terminal of the optical fiber main amplifier；
The radar transmit-receive optical antenna module connects the narrow-linewidth laser light-pulse generator module comprising optical fiber circulator,
Photoswitch and optical antenna；The input terminal of the optical fiber circulator connects the output end of the optical fiber main amplifier；The light is opened
The input terminal of pass connects the one of output end of the optical fiber circulator by optical fiber, described in the output end connection of the photoswitch
Optical antenna；
The signal receiving processing module is separately connected the narrow-linewidth laser light-pulse generator module and radar transmit-receive optical antenna
Module；The signal receiving processing module includes optical fiber adjustable attenuator, optical-fiber bundling device, balances photodetector, at signal
Manage circuit and embedded computer；The input terminal of the optical fiber adjustable attenuator connects another output of the optical fiber prime amplifier
End；The input terminal of the optical-fiber bundling device is separately connected another output end of the optical fiber circulator and the optical fiber adjustable damping
The output end of device；The input terminal of the balance photodetector connects the output end of the optical-fiber bundling device；The signal processing
The input terminal of circuit connects the output end of the balance photodetector, and the output end of the signal processing circuit is connected to described
Embedded computer.
2. airborne measuring wind speed laser radar system as described in claim 1, it is characterised in that：The narrow linewidth seed light source
The single mode narrow linewidth semiconductor laser, DBR/DFB optical fiber lasers, solid that 1.5 mu m wavebands output continuous laser can be used swash
Any one in light device；The spectral line width of the narrow linewidth seed light source is less than 15kHz, and polarization state is linear polarization, and single mode is protected
Inclined optical fiber output, 1~100mW of Output optical power.
3. airborne measuring wind speed laser radar system as described in claim 1, it is characterised in that：The optical fiber prime amplifier is adopted
With single-mode polarization maintaining fiber amplifier or double clad single-mode polarization maintaining fiber amplifier, then using by single-mode polarization maintaining fiber amplifier
The multi-stage fiber amplifier constituted with double clad single-mode polarization maintaining fiber amplifier combination.
4. airborne measuring wind speed laser radar system as described in claim 1, it is characterised in that：The tune of the acousto-optic modulator
Rising edge of a pulse processed is less than 100ns, upper shift frequency 80MHz；The light beam that the acousto-optic modulator exports the optical fiber prime amplifier
It is modulated to the pulsed light of overall with 500ns, pulse recurrence frequency 10kHz.
5. airborne measuring wind speed laser radar system as described in claim 1, it is characterised in that：The C-band boosting is partly led
Body image intensifer is band polarization maintaining fiber pigtail, uses and is pumped with the electric pulse of input pulse phototiming；The main amplification of optical fiber
Device is double clad polarization maintaining optical fibre amplifier.
6. airborne measuring wind speed laser radar system as described in claim 1, it is characterised in that：Band can be used in the photoswitch
Any one in the mechanical optical switch of polarization maintaining fiber pigtail, mems photoswitches, magneto-optic shutter；The photoswitch and fiber optic loop
Optical fiber between shape device connects by the way of welding.
7. airborne measuring wind speed laser radar system as described in claim 1, it is characterised in that：The optical antenna is three
The identical optical antenna of structure and it is all made of monolithic aspherical mirror, the clear aperture of the aspherical mirror is 50mm, and focal length is
180mm；Three optical antennas are directed toward different orientation, and output beam all focuses at respectively 200 meters of front, focal beam spot
Rayleigh range be 30 meters.
8. airborne measuring wind speed laser radar system as described in claim 1, it is characterised in that：The signal processing circuit is only
Acquire and handle the backscatter signal of particulate in the optical antenna focal beam spot Rayleigh range region；The signal
The sample frequency of processing circuit is 400MHz, precision 14bit.
9. airborne measuring wind speed laser radar system as described in claim 1, it is characterised in that：The signal processing circuit
Signal acquisition process flow is as follows：
(1) it is 10KHz according to the repetition rate of laser pulse it is found that the frequency of trigger signal for carrying out signal acquisition is similarly
10KHz, the time interval between triggering twice are 100 μ s；
(2) after receiving trigger signal, the signal processing circuit is adopted after analog signal is carried out high-speed digital signal conversion
Collection, sampling number are 200 points；
(3) it after sampling, by sampled data zero padding to Fourier transform is done after 1024 points, seeks power spectrum and carries out power spectrum
It is cumulative, until being added to stipulated number, trigger signal is otherwise continued waiting for, step (2)-(3) are repeated；
(4) it adds up and continues subsequent processing after completing, maximum likelihood estimation algorithm is used to preceding cumulative power spectrum data
Corresponding frequency is obtained, corresponding radial wind speed is calculated, radial air speed data is exported to the embedded computer；
(5) switching emits the optical antenna, repeats step (2)-(5).
10. airborne measuring wind speed laser radar system as claimed in claim 9, it is characterised in that：Sampling in the correction (2)
Point to remove signal saturation part, i.e., the data acquired every time be after receiving trigger signal postpone certain time and with
200 point datas of 200 meters of focal spot data grid technologies.
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| CN201810838790.9A CN108802425A (en) | 2018-07-27 | 2018-07-27 | A kind of airborne measuring wind speed laser radar system |
| CN201910682564.0A CN110261644A (en) | 2018-07-27 | 2019-07-26 | A kind of airborne measuring wind speed laser radar system |
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| CN201810838790.9A CN108802425A (en) | 2018-07-27 | 2018-07-27 | A kind of airborne measuring wind speed laser radar system |
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| CN201910682564.0A Pending CN110261644A (en) | 2018-07-27 | 2019-07-26 | A kind of airborne measuring wind speed laser radar system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655807A (en) * | 2019-01-28 | 2019-04-19 | 哈工大(北京)军民融合创新研究院有限公司 | The relevant two-dimension scanning laser radar installations of 1.06 μm of pulsed laser heterodynes of one kind and system |
| CN110058258A (en) * | 2019-05-15 | 2019-07-26 | 国耀量子雷达科技有限公司 | A kind of atmospheric boundary layer detection method based on mixed type laser radar |
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| CN106772439B (en) * | 2017-01-06 | 2023-09-15 | 前郭尔罗斯蒙古族自治县岱旭风能有限公司 | Cabin type laser wind-finding radar for multi-distance layered measurement wind field and measurement method thereof |
| CN210269905U (en) * | 2018-07-27 | 2020-04-07 | 成都信息工程大学 | Airborne wind speed measurement laser radar system |
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2018
- 2018-07-27 CN CN201810838790.9A patent/CN108802425A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109655807A (en) * | 2019-01-28 | 2019-04-19 | 哈工大(北京)军民融合创新研究院有限公司 | The relevant two-dimension scanning laser radar installations of 1.06 μm of pulsed laser heterodynes of one kind and system |
| CN110058258A (en) * | 2019-05-15 | 2019-07-26 | 国耀量子雷达科技有限公司 | A kind of atmospheric boundary layer detection method based on mixed type laser radar |
| CN111751844A (en) * | 2020-07-07 | 2020-10-09 | 南京红露麟激光雷达科技有限公司 | Coherent laser radar based on frequency domain coding technology |
| CN111751844B (en) * | 2020-07-07 | 2024-02-23 | 南京泰爱信科技有限公司 | Coherent laser radar based on frequency domain coding technology |
| CN114578319A (en) * | 2022-05-06 | 2022-06-03 | 武汉镭晟科技有限公司 | Fiber laser module for free space gas remote sensing laser radar |
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