CN208888365U - A kind of coherent pulse laser radar - Google Patents
A kind of coherent pulse laser radar Download PDFInfo
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- CN208888365U CN208888365U CN201821447581.3U CN201821447581U CN208888365U CN 208888365 U CN208888365 U CN 208888365U CN 201821447581 U CN201821447581 U CN 201821447581U CN 208888365 U CN208888365 U CN 208888365U
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Abstract
The utility model relates to coherent pulse laser radar, comprising: seed signal generation device, signal transmitting and receiving module, local oscillation signal modulating device and mixer device.Seed signal generation device is for generating narrow linewidth seed laser signal.Signal transmitting and receiving module is used to after narrow linewidth seed laser signal is modulated, is amplified launch, and receives through the reflected end face heliogram of measured target.Local oscillation signal modulating device is used to carry out impulse modulation to narrow linewidth seed laser signal, obtains modulated signal.Mixer device is used to carry out beat frequency processing to end face heliogram and modulated signal, obtains Beat Signal.The technical program increases local oscillation signal modulating device in local oscillator optical path, to carry out impulse modulation to narrow linewidth seed laser signal, obtain modulated signal, and then when carrying out beat frequency processing with the end face heliogram, beat frequency treated pulse distortion and intensity distortion are reduced, finally to restore end face information as far as possible.
Description
Technical field
The utility model belongs to Radar Technology field, and in particular to a kind of coherent pulse laser radar.
Background technique
When coherent pulse laser radar is detected, intrinsic detection blind area is had, theoretically there is the pulsewidth * light velocity/2m
Detection blind area, present inventor have found during invention the application: existing coherent pulse laser radar is because adjust
All rising edges of device processed itself and failing edge limitation, pulsewidth can not modulate sufficiently small, for the pulsewidth of objective reality
Limitation, when emit coherent pulse, pulse the position that output end face and optical antenna are contacted can occur light echo pulse and by force
The distortion of degree can generate pulse broadening, practical blind area about exists after carrying out Coherent processing with local oscillation signal on time-domain signal
The 1.5 times of pulsewidth * light velocity/2m, while abnormal frequency spectrum can be parsed.
Utility model content
In consideration of it, the purpose of this utility model is to provide a kind of coherent pulse laser radar, it is above-mentioned to effectively improve
Problem.
The embodiments of the present invention are achieved in that
The utility model embodiment provides a kind of coherent pulse laser radar, comprising: seed signal generation device, signal
Transmitting and receiving module, local oscillation signal modulating device and mixer device；The seed signal generation device, for generating narrow linewidth
Seed laser signal；The signal transmitting and receiving module is connect with the seed signal generation device, and the signal transmitting receives
Module is used to after the narrow linewidth seed laser signal is modulated, is amplified launch, and receives anti-through measured target
It is emitted back towards the end face heliogram come；The local oscillation signal modulating device is connect with the seed signal generation device, the local oscillator
Modulating apparatus is used to carry out impulse modulation to the narrow linewidth seed laser signal, obtains modulated signal；The mixing dress
It sets and is connect respectively with the local oscillation signal modulating device and the signal transmitting and receiving module, the mixer device is used for described
End face heliogram and the modulated signal carry out beat frequency processing, obtain Beat Signal.
In the utility model optional embodiment, the coherent pulse laser radar further include: photoelectric conversion device, institute
It states mixer device to connect with the photoelectric conversion device, the photoelectric conversion device is used to the Beat Signal being converted to electricity
Signal output.
In the utility model optional embodiment, the coherent pulse laser radar further include: signal processing apparatus, institute
It states photoelectric conversion device to connect with the signal processing apparatus, the signal processing apparatus from the electrical signal for parsing
Required detection information out, wherein the detection information includes: range information apart from the measured target and described tested
The travel frequency information of target.
In the utility model optional embodiment, the signal transmitting and receiving module include: transmitting modulating apparatus,
Amplifier, signal distinguishing device and signal sending and receiving apparatus；The seed signal generation device, the transmitting signal modulation
Device, the amplifier, the signal distinguishing device and the signal sending and receiving apparatus are sequentially connected, the signal distinguishing
Device is also connect with the mixer device；
The transmitting modulating apparatus is for being modulated the amplitude and frequency of the narrow linewidth seed laser signal；
The amplifier is for amplifying modulated narrow linewidth seed laser signal；The signal distinguishing device is used for amplification
Rear narrow linewidth seed laser signal and area is carried out through the received end face heliogram of the signal sending and receiving apparatus
Point；The signal sending and receiving apparatus is used to launch amplified narrow linewidth seed laser signal, and receives through quilt
Survey the reflected end face heliogram of target.
In the utility model optional embodiment, the local oscillation signal modulating device be electrooptical switching, magneto-optic shutter or
Acoustooptic switch.
In the utility model optional embodiment, the local oscillation signal modulating device is modulator.
In the utility model optional embodiment, the signal distinguishing device includes optical circulators part.
In the utility model optional embodiment, the signal sending and receiving apparatus includes mounting of telescope.
In the utility model optional embodiment, stating transmitting modulating apparatus is acousto-optic modulator.
Coherent pulse laser radar provided by the embodiment of the utility model, comprising: seed signal generation device, signal transmitting
Receiving module, local oscillation signal modulating device and mixer device.Seed signal generation device respectively with signal transmitting and receiving module
It is connected with local oscillation signal modulating device, mixer device is connect with signal transmitting and receiving module and local oscillation signal modulating device respectively.
Seed signal generation device is for generating narrow linewidth seed laser signal.Signal transmitting and receiving module is for swashing narrow linewidth seed
Optical signal is modulated, amplify after launch, and receive and emit reflected end face heliogram through measured target.This
The modulating apparatus that shakes is used to carry out impulse modulation to narrow linewidth seed laser signal, obtains modulated signal.Mixer device is used for
Beat frequency processing is carried out to end face heliogram and modulated signal, obtains Beat Signal.The technical program increases in local oscillator optical path
Local oscillation signal modulating device obtains modulated signal to carry out impulse modulation to narrow linewidth seed laser signal, so with
When the end face heliogram carries out beat frequency processing, beat frequency is reduced treated pulse distortion and intensity distortion, so as to finally to the greatest extent
End face information may be restored, end face interference is reduced, while reducing distortion blind area.
Other feature and advantage of the utility model will illustrate in subsequent specification, also, partly from specification
It becomes apparent, or is understood and implementing the utility model embodiment.The purpose of this utility model and other advantages can
It is achieved and obtained by specifically noted structure in written specification, claims and attached drawing.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.By the way that shown in attached drawing, the above and other purpose, feature and advantage of the utility model will more
Clearly.Identical appended drawing reference indicates identical part in all the attached drawings.Do not drawn by actual size equal proportion scaling deliberately
Attached drawing processed, it is preferred that emphasis is show the purport of the utility model.
Fig. 1 shows the structural schematic diagram of existing coherent pulse laser radar.
Fig. 2 shows the structural schematic diagrams for the coherent pulse laser radar that an embodiment of the present invention provides.
Fig. 3 shows the structural schematic diagram of the signal transmitting and receiving module in Fig. 2 provided by the embodiment of the utility model.
Fig. 4 shows the structural schematic diagram of the coherent pulse laser radar of another embodiment of the utility model offer.
Icon: 100- coherent pulse laser radar；11- seed signal generation device；20- signal transmitting and receiving module；
12- emits modulating apparatus；13- amplifier；14- signal distinguishing device；15- signal sending and receiving apparatus；16- sheet
Shake modulating apparatus；17- mixer device；18- photoelectric conversion device；19- signal processing apparatus.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Usually here in attached drawing description and
The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.
Therefore, requirement is not intended to limit to the detailed description of the embodiments of the present invention provided in the accompanying drawings below
The scope of the utility model of protection, but it is merely representative of the selected embodiment of the utility model.Based in the utility model
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the range of the utility model protection.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right",
The orientation or positional relationship of the instructions such as "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings or this is practical new
Type product using when the orientation or positional relationship usually put, be merely for convenience of describing the present invention and simplifying the description, and
It is not that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore
It should not be understood as limiting the present invention.In addition, term " first ", " second ", " third " etc. are only used for distinguishing description, and
It cannot be understood as indicating or implying relative importance.Furthermore term "and/or" in the application, only a kind of description association pair
The incidence relation of elephant, indicate may exist three kinds of relationships, for example, A and/or B, can indicate: individualism A, exist simultaneously A and
These three situations of B, individualism B.
In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, term " is set
Set ", " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection,
Or it is integrally connected；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, intermediary can also be passed through
It is indirectly connected, can be the connection inside two elements.For the ordinary skill in the art, it can be managed with concrete condition
Solve the concrete meaning of above-mentioned term in the present invention.
Referring to Fig. 1, Fig. 1 is the structural schematic diagram of existing coherent pulse laser radar.Existing coherent pulse laser thunder
Up in measuring technique, the laser signal that coherent source 1 generates is put after the adjustment of modulation device 2 using amplifier 3
Greatly, using 5 emission detection of ring-shaped device 4 and optical antenna, while the echo-signal returned is received by optical antenna 5,
The echo-signal carries out Coherent processing with local oscillator optical signal at device 7 after passing through ring-shaped device 4, using Electro-Optical Sensor Set
8 are converted to electric signal is handled eventually by data processing equipment 9.Present inventor is during invention the application
It was found that: because all rising edges of modulation device 2 itself and failing edge limit, pulsewidth can not be modulated sufficiently small, for visitor
Existing pulsewidth limitation is seen, when emitting coherent pulse, pulse can occur in the position that output end face and optical antenna 5 are contacted
The distortion of light echo pulse and intensity can generate pulse broadening after carrying out Coherent processing with local oscillation signal on time-domain signal, real
Border blind area can parse abnormal frequency spectrum about in the 1.5 times of pulsewidth * light velocity/2m.
Wherein, it should be noted that be inventor by practice and careful for defect present in above scheme
It is being obtained after research as a result, therefore, the discovery procedure of the above problem and hereinafter the utility model embodiment are asked for above-mentioned
Itd is proposed solution is inscribed, all should be the contribution that inventor makes the utility model during the utility model.
In consideration of it, the embodiment of the present application provides a kind of coherent pulse laser radar 100, as shown in Figure 2.The coherent pulse
Laser radar 100, comprising: seed signal generation device 11, signal transmitting and receiving module 20, local oscillation signal modulating device 16 and
Mixer device 17.Wherein, seed signal generation device 11 respectively with signal transmitting and receiving module 20 and local oscillation signal modulating device
16 connections, mixer device 17 are connect with signal transmitting and receiving module 20 and local oscillation signal modulating device 16 respectively.
Wherein, seed signal generation device 11 is for generating narrow linewidth seed laser signal.On the one hand, the narrow linewidth seed
Laser signal passes through signal transmitting and receiving module 20, so that the signal transmitting and receiving module 20 is used for the narrow linewidth seed
Laser signal is modulated, amplify after launch, and receive through the reflected end face heliogram of measured target.It is another
Aspect, which also passes through local oscillation signal modulating device 16, so as to the local oscillation signal modulating device 16
For carrying out impulse modulation to the narrow linewidth seed laser signal, modulated signal is obtained, and then to swash to narrow linewidth seed
Optical signal carries out impulse modulation, obtains modulated signal, and then when carrying out beat frequency processing with the end face heliogram, reduces and clap
Frequently pulse distortion that treated and intensity distortion reduce end face interference, reduce simultaneously finally to restore end face information as far as possible
Distortion blind area.
Wherein, the local oscillation signal modulating device 16 is used to carry out impulse modulation to narrow linewidth seed laser signal, obtains
Modulated signal, meanwhile, it is synchronized with transmitting signal, to reduce beat frequency when carrying out beat frequency processing with the end face heliogram
Pulse distortion that treated and intensity distortion reduce end face interference, while reducing abnormal finally to restore end face information as far as possible
Cecutiency area.Optionally, which is electrooptical switching, magneto-optic shutter or acoustooptic switch.Pass through control
It switches on and the shut-in time, it can be by narrow linewidth seed laser signal modulation at pulse signal.As another optional
Mode, which can be modulator, for example, amplitude modulaor etc..
Wherein, the mixer device 17 respectively with the local oscillation signal modulating device 16 and the signal transmitting and receiving module
20 connections.Indispensable component of the mixer device 17 as coherent detection laser radar, for the end face heliogram
(V) and the modulated signal (V0) beat frequency processing is carried out, Beat Signal is obtained, the interference of other optical signallings is reduced.
The signal transmitting and receiving module 20 after the narrow linewidth seed laser signal is modulated, is amplified for emitting
It goes out, and receives through the reflected end face heliogram of measured target.As an alternative embodiment, such as Fig. 3 institute
Show, which includes: transmitting modulating apparatus 12, amplifier 13, signal distinguishing device 14 and letter
Number sending and receiving apparatus 15.Wherein, the seed signal generation device 11, the transmitting modulating apparatus 12, the amplification
Device 13, the signal distinguishing device 14 and the signal sending and receiving apparatus 15 are sequentially connected, the signal distinguishing device 14
Also it is connect with the mixer device 17.
The transmitting modulating apparatus 12 is for adjusting the amplitude and frequency of the narrow linewidth seed laser signal
System.The amplifier 13 is for amplifying modulated narrow linewidth seed laser signal.The signal distinguishing device 14 is used
In to amplified narrow linewidth seed laser signal and through the received end face light echo of the signal sending and receiving apparatus 15
Signal distinguishes.The signal sending and receiving apparatus 15 is used to launch amplified narrow linewidth seed laser signal,
And it receives through the reflected end face heliogram of measured target.
Wherein, for the coherent laser radar of different purposes, the modulation system of the transmitting modulating apparatus 12 be can be
The modes such as scanning function modulation, impulse modulation.Optionally, which is acousto-optic modulator.
Wherein, the amplifier 13 is used to amplify preposition modulated narrow linewidth seed laser signal, in order to
It is able to carry out more remote detection, amplification factor parameter etc. is determined according to specifically used requirement.
Wherein, signal distinguishing device 14 is used to emit the signal and signal for being sent to signal sending and receiving apparatus 15
The received end face heliogram of reception device 15 distinguishes.The reception of signal and transmitting optical path use a kind of in the utility model
Structure can minimize optical path size and cost etc., and optionally, which includes optical circulators part.
Wherein, the signal sending and receiving apparatus 15 is used for the amplified narrow linewidth kind for sending signal distinguishing device 14
Sub- laser signal is launched, and receives through the reflected end face heliogram of measured target.Wherein, signal transmitting connects
Receiving apparatus 15 includes mounting of telescope.Optionally, which includes optical antenna and lens barrel, is physically being protected
The direction of the launch and Receiver aperture of signal are demonstrate,proved, receiving efficiency etc. is increased.
In addition, as an alternative embodiment, as shown in figure 4, the coherent pulse laser radar 100 further include:
Photoelectric conversion device 18, the mixer device 17 are connect with the photoelectric conversion device 18, and the photoelectric conversion device 18 is used for
The Beat Signal is converted into electrical signal output.The coherent pulse laser radar 100 further include: signal processing apparatus
19, the photoelectric conversion device 18 is connect with the signal processing apparatus 19, and the signal processing apparatus 19 is used for from the electricity
It learns in signal and parses required detection information, wherein the detection information includes: the range information apart from the measured target
And the travel frequency information of the measured target.
Wherein, the application in order to better understand in one of them concrete application scene, surveys wind with coherent pulse and swashs
For optical radar, it is 300ns that traditional coherent pulse anemometry laser radar, which detects pulsewidth, then theoretically detection blind area is
300ns*3*108M/s/2=45m, in actually using, in the pulse laser meeting that the optics endface of emitter is reflected
There is broadening, after carrying out beat frequency with local oscillation signal, actual measurement blind area has reached 60m, and there are 50% gaps with theoretical value.This reality
After being applied to anemometry laser radar field with 100 technology of coherent pulse laser radar in novel, to local oscillator optical signal (narrow linewidth
Seed laser signal) it is modulated, while being synchronized with pulse transmission signals, after carrying out beat frequency processing to the signal of endface, by
It is modulated in local oscillation signal, signal strength and waveform are all changed, and the pulse signal distortion band due to endface can be made up
The influence come, is tested by real system, and measurement blind area reduces the signal blind zone in actual use, improve relevant in 50m
The use scope of pulse detection anemometry laser radar.
In conclusion coherent pulse laser radar provided by the embodiments of the present application, comprising: include: that seed signal generates dress
It sets, signal transmitting and receiving module, local oscillation signal modulating device, mixer device, photoelectric conversion device and signal processing apparatus.Its
In, signal transmitting and receiving module includes: that transmitting modulating apparatus, amplifier, signal distinguishing device and signal transmitting receive
Device.Wherein, seed signal generation device, for generating narrow linewidth seed laser signal；The signal transmitting and receiving module is used
Launch after the narrow linewidth seed laser signal is modulated, is amplified, and receives and reflected through measured target
End face heliogram；The local oscillation signal modulating device is used to carry out impulse modulation to the narrow linewidth seed laser signal,
Obtain modulated signal；The mixer device is used to carry out beat frequency processing to the end face heliogram and the modulated signal, obtains
To Beat Signal；The photoelectric conversion device is used to being converted to the Beat Signal into electrical signal output；The signal processing
Device from the electrical signal for parsing required detection information, wherein the detection information includes: apart from the quilt
Survey the range information of target and the travel frequency information of the measured target.The technical program increases this in local oscillator optical path
Shake modulating apparatus, to carry out impulse modulation to narrow linewidth seed laser signal, obtains modulated signal, so with it is described
When end face heliogram carries out beat frequency processing, beat frequency treated pulse distortion and intensity distortion are reduced, so as to finally as far as possible
End face information is restored, end face interference is reduced, while reducing distortion blind area.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (9)
1. a kind of coherent pulse laser radar characterized by comprising
Seed signal generation device, for generating narrow linewidth seed laser signal；
Signal transmitting and receiving module, the signal transmitting and receiving module are connect with the seed signal generation device, the signal
Transmitting and receiving module is used to after the narrow linewidth seed laser signal is modulated, is amplified launch, and receives through quilt
Survey the reflected end face heliogram of target；
Local oscillation signal modulating device, the local oscillation signal modulating device are connect with the seed signal generation device, the local oscillator
Modulating apparatus is used to carry out impulse modulation to the narrow linewidth seed laser signal, obtains modulated signal；
And mixer device, the mixer device respectively with the local oscillation signal modulating device and the signal transmitting and receiving module
Connection, the mixer device are used to carry out beat frequency processing to the end face heliogram and the modulated signal, obtain beat letter
Number.
2. coherent pulse laser radar according to claim 1, which is characterized in that the coherent pulse laser radar also wraps
Include: photoelectric conversion device, the mixer device are connect with the photoelectric conversion device, and the photoelectric conversion device is used for will be described
Beat Signal is converted to electrical signal output.
3. coherent pulse laser radar according to claim 2, which is characterized in that the coherent pulse laser radar also wraps
Include: signal processing apparatus, the photoelectric conversion device are connect with the signal processing apparatus, the signal processing apparatus be used for from
Required detection information is parsed in the electrical signal, wherein the detection information include: apart from the measured target away from
From information and the travel frequency information of the measured target.
4. coherent pulse laser radar according to any one of claim 1-3, which is characterized in that the signal transmitting
Receiving module includes: transmitting modulating apparatus, amplifier, signal distinguishing device and signal sending and receiving apparatus；Described kind
Subsignal generation device, the transmitting modulating apparatus, the amplifier, the signal distinguishing device and signal hair
It penetrates reception device to be sequentially connected, the signal distinguishing device is also connect with the mixer device；
The transmitting modulating apparatus is for being modulated the amplitude and frequency of the narrow linewidth seed laser signal；
The amplifier is for amplifying modulated narrow linewidth seed laser signal；
The signal distinguishing device is used to emit reception dress to amplified narrow linewidth seed laser signal and through the signal
The received end face heliogram is set to distinguish；
The signal sending and receiving apparatus is for launching amplified narrow linewidth seed laser signal.
5. coherent pulse laser radar according to claim 4, which is characterized in that the local oscillation signal modulating device is electricity
Photoswitch, magneto-optic shutter or acoustooptic switch.
6. coherent pulse laser radar according to claim 4, which is characterized in that the local oscillation signal modulating device is to adjust
Device processed.
7. coherent pulse laser radar according to claim 4, which is characterized in that the signal distinguishing device includes optics
Ring-shaped device.
8. coherent pulse laser radar according to claim 4, which is characterized in that the signal sending and receiving apparatus includes
Mounting of telescope.
9. coherent pulse laser radar according to claim 4, which is characterized in that the transmitting modulating apparatus is sound
Optical modulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821447581.3U CN208888365U (en) | 2018-09-04 | 2018-09-04 | A kind of coherent pulse laser radar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821447581.3U CN208888365U (en) | 2018-09-04 | 2018-09-04 | A kind of coherent pulse laser radar |
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| CN208888365U true CN208888365U (en) | 2019-05-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761426A (en) * | 2018-09-04 | 2018-11-06 | 南京牧镭激光科技有限公司 | A kind of coherent pulse laser radar |
| WO2024138756A1 (en) * | 2022-12-30 | 2024-07-04 | 深圳市镭神智能***有限公司 | Laser radar, laser radar measurement method, electronic device, and readable storage medium |
-
2018
- 2018-09-04 CN CN201821447581.3U patent/CN208888365U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761426A (en) * | 2018-09-04 | 2018-11-06 | 南京牧镭激光科技有限公司 | A kind of coherent pulse laser radar |
| WO2024138756A1 (en) * | 2022-12-30 | 2024-07-04 | 深圳市镭神智能***有限公司 | Laser radar, laser radar measurement method, electronic device, and readable storage medium |
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Address after: 210000 room 0601, building C, Xingzhi Science Park, Xingzhi Road, Nanjing Economic and Technological Development Zone, Nanjing, Jiangsu Province Patentee after: Nanjing Mulai Laser Technology Co.,Ltd. Address before: 210000 room 0601, building C, Xingzhi Science Park, Xingzhi Road, Nanjing Economic and Technological Development Zone, Nanjing, Jiangsu Province Patentee before: NANJING MOVELASER TECHNOLOGY Co.,Ltd. |
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Address after: 210000 Building B2, Hongfeng Science Park, Kechuang Road, Nanjing Economic and Technological Development Zone, Jiangsu Province Patentee after: Nanjing Mulai Laser Technology Co.,Ltd. Address before: 210000 room 0601, building C, Xingzhi Science Park, Xingzhi Road, Nanjing Economic and Technological Development Zone, Nanjing, Jiangsu Province Patentee before: Nanjing Mulai Laser Technology Co.,Ltd. |