CN107728130A - Multi-channel wide Amplitude Composition aperture laser imaging radar receive-transmit system - Google Patents
Multi-channel wide Amplitude Composition aperture laser imaging radar receive-transmit system Download PDFInfo
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- CN107728130A CN107728130A CN201710828948.XA CN201710828948A CN107728130A CN 107728130 A CN107728130 A CN 107728130A CN 201710828948 A CN201710828948 A CN 201710828948A CN 107728130 A CN107728130 A CN 107728130A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
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- Computer Networks & Wireless Communication (AREA)
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- Radar, Positioning & Navigation (AREA)
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- Optical Radar Systems And Details Thereof (AREA)
Abstract
A kind of multi-channel wide Amplitude Composition aperture laser imaging radar receive-transmit system, emission system, which is formed, includes LASER Light Source, frequency modulator, AWG, fiber optic splitter, fiber amplifier group, fiber array device, lens, the first beam splitter, Brewster prism shrink beam device, and reception system, which is formed, includes the second beam splitter, receiving lens, detector array, capture card and computer.The present invention increases the optics toes and imaging bar amplitude of target face by way of multiple-input and multiple-output, and this will have very important significance to remote high-resolution airbome synthetic aperture laser imaging radar.
Description
Technical field
The present invention relates to synthetic aperture laser imaging radar, particularly a kind of multi-channel wide Amplitude Composition aperture laser imaging
Radar transmit-receive system, have to the airbome synthetic aperture laser imaging radar of the wide bar amplitude of remote high-resolution very important
Meaning.
Background technology
Synthetic aperture laser imaging radar (Synthetic Aperture Imaging Ladar, abbreviation SAIL) is can
Unique optical imagery Observations Means of Centimeter Level imaging resolution are being obtained at a distance, and its principle takes from the conjunction of RF application
Into aperture laser radar (Synthetic Aperture Radar, abbreviation SAR) principle, by contrast, optical wavelength is relatively micro-
The small 3-6 number magnitude of ripple wavelength, this results in SAIL resolution ratio SAR to want the high 3-6 order of magnitude, meanwhile, direct band
The problem of coming is that visual field wants the small 2-5 order of magnitude.The current airborne SAIL realized both at home and abroad maximum imaging viewing field is
4.8mrad, much smaller than the visual field of SAR and CCD camera (Lu Zhiyong, Zhou Yu, Sun Jianfeng, Luan Zhu, Wang Lijuan, Xu Qian, Li Guangyuan,
The airborne Orthoptic synthetic aperture laser imaging radar outfields of Zhang Guo, Liu Li people and flight experiment [J] Chinese lasers, 2017,44
(01):265-271.)。
Prior art (Yu Tang, Bao Qin, Yun Yan, and Mengdao Xing, " Multiple-input
multiple-output synthetic aperture ladar system for wide-swath with high
Azimuth resolution, " Appl.Opt.55,1401-1405 (2016)) propose a kind of orientation MIMO SAL bodies
System, synthesized using the multi-channel data of orientation, solve the contradiction of orientation high-resolution and distance to mapping bandwidth.But
It is that the program does not provide the R-T unit of the Synthetic Aperture Laser Radar of MIMO, and does not account for launching in light path
The influence that dutycycle between the covering and fibre core of launching fiber is imaged to far field.
Multiple light beams are simultaneously emitted by the SAIL emitters of MIMO, the transmitting light as the SAIL of MIMO
Road, transmitting light pass through optical fiber output.If the SAIL of MIMO launching fiber with straight rail to carrying out on vertical direction
During arrangement, due to the presence of fibre cladding, target face is not arrived by full illumination upwards in cross rail, as SAIL in straight rail to entering
During row Scan, into picture be object each discrete local picture.
In view of problem above, we have carried out grinding for multi-channel wide Amplitude Composition aperture laser imaging radar receive-transmit system
Study carefully.This will have very important significance to the airbome synthetic aperture laser imaging radar of the wide bar amplitude of remote high-resolution.
The content of the invention
Present invention aims at further development synthetic aperture laser imaging radar, a kind of multi-channel wide Amplitude Composition is proposed
Aperture laser imaging radar receive-transmit system.The system features are that it increases target face by way of multiple-input and multiple-output
Optics toes and imaging bar amplitude, and the dutycycle in transmitting light path between the covering and fibre core of launching fiber is considered to remote
The influence of field imaging, give the inclination arrangement of optical fiber in fiber array device.In addition, for coherent detection system, receive
Visual field is restricted by antenna law, and Receiver aperture is inversely proportional with visual field.And in order to improve reception resolution ratio, system power dissipation is reduced,
It it is generally desirable to use collection with large aperture.In order to solve the contradiction between Receiver aperture and visual field, present invention uses array heterodyne
Reception mode.This will have very important significance to remote high-resolution airbome synthetic aperture laser imaging radar.
The technical solution of the present invention is as follows：
A kind of multi-channel wide Amplitude Composition aperture laser imaging radar receive-transmit system, including emission system and reception system,
Feature is,
Described emission system includes LASER Light Source, frequency modulator, AWG, fiber optic splitter, optical fiber
Amplifier group, fiber array device, lens, the first beam splitter, Brewster prism shrink beam device, reception system, which is formed, includes second point
Beam device, detector array, capture card and computer；The output end of described LASER Light Source and the first of described frequency modulator
Input is connected, and the output end of described AWG is connected with the second input of described frequency modulator, institute
The output end for the frequency modulator stated is connected with the input of described fiber optic splitter, and the first of described fiber optic splitter is defeated
Go out end, the second output end, the 3rd the n-th output end of output end ... are put with the first optical fiber in described fiber amplifier group respectively
The big input of device, the input of the second fiber amplifier, the fiber amplifier of input ... n-th of the 3rd fiber amplifier
Input is connected, the output of the output end, the second fiber amplifier of the first fiber amplifier in described fiber amplifier group
End, the 3rd fiber amplifier the fiber amplifier of output end ... n-th output end respectively with described fiber array device the
One input, the second input, the 3rd the n-th input of input ... are connected, the output end of described fiber array device and institute
The input for the lens stated is connected, and the output end of described lens is connected with the input of the first described beam splitter；Described
First output end of the first beam splitter is connected with the input of described Brewster prism shrink beam device, described Brewster rib
The signal of the output end output of mirror shrink beam device is transmission signal, and described n is more than 3 positive integer；
Described reception system, which is formed, includes receiving lens, the second beam splitter, detector array, capture card and computer；
Echo-signal of the transmission signal after target face enters the input of described receiving lens, the output of described receiving lens
The first input end in the second described beam splitter is held to be connected, the second output end of the first described beam splitter and described second
Second input of beam splitter is connected, the output end of the second described beam splitter and the input phase of described detector array
Even, the output end of described detector array is connected with the input of described capture card, the output end of described capture card and
The input of described computer is connected.
Described Brewster prism shrink beam device is made up of the first cylinder wedge-shaped mirrors and the second cylinder wedge-shaped mirrors；
The light that the fibre core of optical fiber comes out in described fiber array device cross rail must meet most great achievement upwards at far field
Overlapped in the case of slice amplitude to ensure target by full illumination, then need to consider launching fiber in transmitting light path
The influence that dutycycle between covering and fibre core is imaged to far field.The diameter of every optical fiber is D in fiber array device, and fibre core is straight
Footpath is d, and the numbering of n root optical fiber is respectively：f1,f2,..,fn, the upward distance values dr of the cross rails of two adjacent optical fiber of subscript
It is fixed, it is η times of core diameter, wherein 0 ＜ η ＜ 1, the n roots launching fiber in described fiber array device 6 presses following arrangement side
Formula is arranged：Keep tangent between adjacent two optical fiber, launching fiber arrangement mode L is L=(f1,f2,..,fn), n root light
Angle theta between the line and horizontal line at fine center meets following relation：
The arrangement mode of launching fiber can ensure that launch light cross rail at far field exists upwards in described fiber array device
Meet to overlap in the case of maximum imaging bar amplitude, then target can be by complete imaging.
The array element of described detector array is identical with the quantity of the launching fiber of described fiber array device, arrangement mode
Unanimously, closely coupled between each array element, the angle theta between the line and horizontal line at the center of n array element meets following relation：
Further, since flashlight after being collimated through described diversing lens by described Brewster prism shrink beam
Device realize cross rail near field compression, far field expands.Then the upward near field of corresponding cross rail have compressed how many times, will be opened up on far field
Same multiple is opened up, then similarly increases corresponding multiple on described detector array cross rail detection viewing field.If Receiver aperture
To launch a times of bore, the compression ratio of described Brewster prism shrink beam device is b, then described detector array test surface
The unit array element of single launching fiber is to the array relationship upward with cross rail in straight rail corresponding to upper：a×ab.
Pass through local oscillator light of the first described beam splitter reflection light as receives echo-signal, the local oscillator light in emission system
In n beams light correspond to each passage that cross rail is upward in described detector array respectively, local oscillator light from target face with reflecting
The echo-signal returned carries out heterodyne reception by described detector array.
Compared with prior art, the beneficial effects of the invention are as follows：
1. the present invention increases the optics toes and imaging bar amplitude of target face by the way of multiple-input and multiple-output, expand
Visual field.
2. the dutycycle that the present invention considers in fiber array device between the covering and fibre core of launching fiber is imaged to far field
Influence, give the inclination arrangement of optical fiber in fiber array device.The arrangement mode of launching fiber can ensure target into
It is the complete imaging of target during picture, rather than discrete local picture.
2. present invention uses array heterodyne reception mode, solve in coherent detection system between Receiver aperture and visual field
Contradiction, further expand imaging viewing field.
Brief description of the drawings
Fig. 1 is the structural representation of multi-channel wide Amplitude Composition aperture laser imaging radar receive-transmit system of the present invention.
Fig. 2 is optical fiber in fiber array device in multi-channel wide Amplitude Composition aperture laser imaging radar receive-transmit system of the present invention
The structural representation (n=16) of arrangement.
Fig. 3 is that fiber array device launches light in multi-channel wide Amplitude Composition aperture laser imaging radar receive-transmit system of the present invention
The light of fibre transmitting is imaged on the upward projection of cross rail in the imaging (n=16) in far field, (a) far field imaging schematic diagram, (b) far field.
Fig. 4 is the battle array in detector array in multi-channel wide Amplitude Composition aperture laser imaging radar receive-transmit system of the present invention
First layout viewing (n=4).
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples, but the guarantor of the present invention should not be limited with this
Protect scope.
Fig. 1 is the structural representation of multi-channel wide Amplitude Composition aperture laser imaging radar receive-transmit system of the present invention.By scheming
It can be seen that multi-channel wide Amplitude Composition aperture laser imaging radar receive-transmit system of the present invention, including emission system and reception system,
Described emission system include LASER Light Source 1, frequency modulator 2, AWG 3, fiber optic splitter 4,
Fiber amplifier group 5, fiber array device 6, diversing lens 7, the first beam splitter 8 and Brewster prism shrink beam device 9；
The output end of described LASER Light Source 1 is connected with the first input end of described frequency modulator 2, and described is any
The output end of waveform generator 3 is connected with the second input of described frequency modulator 2, described frequency modulator 2 it is defeated
Go out end with the input of described fiber optic splitter 4 to be connected, the first output end of described fiber optic splitter 4, the second output end,
3rd output end ..., the input with the first fiber amplifier 51 in described fiber amplifier group 5 respectively of the n-th output end
End, the input of the second fiber amplifier 52, the 3rd fiber amplifier 53 input ..., the n-th fiber amplifier 5n it is defeated
Enter end to be connected, the output end of the first fiber amplifier 51 in described fiber amplifier group 5, the second fiber amplifier 52
Output end, the output end of the 3rd fiber amplifier 53 ..., the n-th fiber amplifier 5n output end respectively with described optical fiber
The first input end of array device 6, the second input, the 3rd input ..., the n-th input be connected, described fiber array device
Incident light is divided into transmitted light by 6 output light through described lens 7 and the first described beam splitter 8, first beam splitter 8 successively
And reflected light, the described output of Brewster prism shrink beam device 9 of described transmitted light warp are transmission signal, described n be 3 with
On positive integer；
Described reception system, which is formed, includes receiving lens 10, the second beam splitter 11, detector array 12, capture card 13
With computer 14；
The echo-signal that described transmission signal reflects through target face passes through described receiving lens 10, through described successively
Second beam splitter 11 simultaneously enters after described the second beam splitter 11 reflection described with the reflected light of the first described beam splitter 8
Detector array 12, the input phase of the acquired card 13 of output end and described computer 14 of described detector array 12
Even.
The multi-channel wide Amplitude Composition aperture laser imaging radar receive-transmit system is characterised by described Brewster prism
Shrink beam device 9 is made up of the first cylinder wedge-shaped mirrors 91 and the second cylinder wedge-shaped mirrors 92；
The light that the fibre core of optical fiber comes out in described fiber array device 6 cross rail must meet most great achievement upwards at far field
Overlapped in the case of slice amplitude to ensure target by full illumination, then need to consider launching fiber in transmitting light path
The influence that dutycycle between covering and fibre core is imaged to far field.The diameter of every optical fiber of fiber array device 6 is D, fibre core
Diameter is d, and the numbering of n root optical fiber is respectively：f1,f2,..,fn, the upward distance values of the cross rails of two adjacent optical fiber of subscript
Dr is fixed, and is η times of core diameter, wherein 0 ＜ η ＜ 1, the n roots launching fiber of described fiber array device 6 presses following arrangement side
Formula is arranged：Keep tangent between adjacent two optical fiber, launching fiber arrangement mode L is L=(f1,f2,..,fn), n root light
Angle theta between the line and horizontal line at fine center meets following relation：
The arrangement mode of launching fiber can ensure that launch light cross rail at far field exists upwards in described fiber array device 6
Meet to overlap in the case of maximum imaging bar amplitude, then target can be by complete imaging.
The array element of described detector array 12 is identical with the quantity of the launching fiber of described fiber array device 6, arrangement
Mode is consistent, closely coupled between each array element, and the angle theta between the line and horizontal line at the center of n array element meets as follows
Relation：
Further, since flashlight is realized after being collimated through lens by described Brewster prism shrink beam device 9
Cross rail near field compression, far field expands.Then the upward near field of corresponding cross rail have compressed how many times, will be expanded equally on far field
Multiple, then similarly increase corresponding multiple on the described cross rail detection viewing field of detector array 12.If Receiver aperture is transmitting
A times of bore, the compression ratio of described Brewster prism shrink beam device 9 is b, then right on the described test surface of detector array 12
The unit array element for the single launching fiber answered is to the array relationship upward with cross rail in straight rail：a×ab.
Pass through local oscillator light of the described reflected light of the first beam splitter 8 as receives echo-signal, the local oscillator in emission system
N beams light in light corresponds to each array element that cross rail is upward in described detector array 12 respectively, local oscillator light with from target face
The echo-signal reflected carries out heterodyne reception, the described heterodyne reception of detector array 12 by described detector array 12
The acquired card 13 of signal described computer 14 of making a gift to someone carry out data processings.
Experiment shows that the present invention increases the optics toes and imaging vertically hung scroll of target face by way of multiple-input and multiple-output
Degree, and the influence that the dutycycle in transmitting light path between the covering and fibre core of launching fiber is imaged to far field is considered, provide
The inclination arrangement of optical fiber in fiber array device.In addition, for coherent detection system, field of view of receiver is by antenna law system
About, Receiver aperture is inversely proportional with visual field.And in order to improve reception resolution ratio, reduce system power dissipation, it is often desirable that use heavy caliber
Receive.In order to solve the contradiction between Receiver aperture and visual field, the present invention uses array heterodyne reception mode.This will be to remote
High-resolution airbome synthetic aperture laser imaging radar has very important significance.
Claims (2)
1. a kind of multi-channel wide Amplitude Composition aperture laser imaging radar receive-transmit system, including emission system and reception system, its
It is characterised by：
Described emission system includes LASER Light Source (1), frequency modulator (2), AWG (3), fiber optic splitter
(4), fiber amplifier group (5), fiber array device (6), diversing lens (7), the first beam splitter (8) and Brewster prism shrink beam
Device (9)；
The output end of described LASER Light Source (1) is connected with the first input end of described frequency modulator (2), and described is any
The output end of waveform generator (3) is connected with the second input of described frequency modulator (2), described frequency modulator
(2) output end is connected with the input of described fiber optic splitter (4), the first output end of described fiber optic splitter (4),
Second output end, the 3rd output end ..., the n-th output end puts with the first optical fiber in described fiber amplifier group (5) respectively
The big input of device (51), the input of the second fiber amplifier (52), the 3rd fiber amplifier (53) input ...,
The input of n-th fiber amplifier (5n) is connected, the first fiber amplifier (51) in described fiber amplifier group (5) it is defeated
Go out end, the output end of the second fiber amplifier (52), the output end of the 3rd fiber amplifier (53) ..., the n-th fiber amplifier
The output end of (5n) respectively the first input end with described fiber array device (6), the second input, the 3rd input ...,
N-th input is connected, and the diversing lens (7) that the output light warp of described fiber array device (6) is described enter described first point
Incident light is divided into transmitted light and reflected light, the described Bruce of described transmitted light warp by beam device (8), first beam splitter (8)
Special prism shrink beam device (9) exports transmission signal, and described n is more than 3 positive integer；
Described reception system include receiving lens (10), the second beam splitter (11), detector array (12), capture card (13) and
Computer (14)；
The echo-signal that described transmission signal reflects through target face is successively through described receiving lens (10), through described
Two beam splitters (11) simultaneously enter institute with the reflected light of described the first beam splitter (8) after described the second beam splitter (11) reflection
The detector array (12) stated, the acquired card (13) of output end and the described computer (14) of described detector array (12)
Input be connected.
2. multi-channel wide Amplitude Composition aperture laser imaging radar receive-transmit system according to claim 1, it is characterised in that：
The diameter of every optical fiber in described fiber array device (6) is D, and core diameter is d, and the numbering of n root optical fiber is respectively：
f1,f2,..,fn, the distance values dr that the cross rail of two adjacent optical fiber of subscript is upward is fixed, and is η times of core diameter, wherein, 0
＜ η ＜ 1, the n root launching fibers in described fiber array device (6) are arranged in the following manner：
Keep tangent between adjacent two optical fiber, described launching fiber arrangement mode L is L=(f1,f2,..,fn), n root optical fiber
Center line and horizontal line between angle theta meet following relation：
<mrow>
<mi>sin</mi>
<mi>&theta;</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mi>d</mi>
<mi>r</mi>
</mrow>
<mi>D</mi>
</mfrac>
<mo>,</mo>
</mrow>
The array element of described detector array (12) is identical with the quantity of the launching fiber of described fiber array device (6), arrangement
Mode is consistent, closely coupled between each array element, and the angle theta between the line and horizontal line at the center of n array element meets as follows
Relation：
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<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mi>&theta;</mi>
<mo>=</mo>
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<mrow>
<mi>d</mi>
<mi>r</mi>
</mrow>
<mi>D</mi>
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Cited By (5)
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| CN110346777A (en) * | 2018-04-03 | 2019-10-18 | 通用汽车环球科技运作有限责任公司 | Image intensifer in coherent lidar system return path |
| CN110346778A (en) * | 2018-04-03 | 2019-10-18 | 通用汽车环球科技运作有限责任公司 | Coherent lidar system with extended field of view |
| CN112213736A (en) * | 2020-07-17 | 2021-01-12 | 中国工程物理研究院应用电子学研究所 | Three-dimensional target imaging laser radar device and target detection method |
| WO2023061386A1 (en) * | 2021-10-15 | 2023-04-20 | 华为技术有限公司 | Laser radar, receiving system, emitting system, and control method |
| CN117805854A (en) * | 2024-03-01 | 2024-04-02 | 中国科学院空天信息创新研究院 | MIMO-based laser SAL wide-field imaging device and method |
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| CN110346778B (en) * | 2018-04-03 | 2023-11-21 | 通用汽车环球科技运作有限责任公司 | Coherent lidar system with extended field of view |
| CN110346777B (en) * | 2018-04-03 | 2024-02-27 | 通用汽车环球科技运作有限责任公司 | Optical amplifier in return path of coherent lidar system |
| CN112213736A (en) * | 2020-07-17 | 2021-01-12 | 中国工程物理研究院应用电子学研究所 | Three-dimensional target imaging laser radar device and target detection method |
| WO2023061386A1 (en) * | 2021-10-15 | 2023-04-20 | 华为技术有限公司 | Laser radar, receiving system, emitting system, and control method |
| CN117805854A (en) * | 2024-03-01 | 2024-04-02 | 中国科学院空天信息创新研究院 | MIMO-based laser SAL wide-field imaging device and method |
| CN117805854B (en) * | 2024-03-01 | 2024-05-07 | 中国科学院空天信息创新研究院 | MIMO-based laser SAL wide-field imaging device and method |
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