CN104753593A - Single-route extracting method and device for space photo-communication - Google Patents
Single-route extracting method and device for space photo-communication Download PDFInfo
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- CN104753593A CN104753593A CN201310756577.0A CN201310756577A CN104753593A CN 104753593 A CN104753593 A CN 104753593A CN 201310756577 A CN201310756577 A CN 201310756577A CN 104753593 A CN104753593 A CN 104753593A
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Abstract
The invention provides a single-route extracting method and device for space photo-communication. Optical imaging is performed to a communication space, the image is divided to multiple regions regarded as pixels, the pixels correspond to the regions in the space one by one, one or more pixels is selected as an optical communication source, and a receiver performs the analysis, filtering detection and collection to the optical communication source. According to the method, a collecting point automatically receives the optical signal of the corresponding region in the space, the pixel is smaller, the corresponding region is smaller, and the tiny pixel can be taken, so the region in the space can be reduced as a point nearly; the receiver only collects the light ray emitted by the point; if the point is the light source, the direct light ray emitted by the point can be collected only; and if the point is not the light source, the reflection or diffusion light ray emitted by the point is collected only, so the multi-route problem of the light emitting diode (LED) visible light communication can be effectively avoided.
Description
Technical field
The invention belongs to space optical communication source domain, particularly a kind of method of anti-multipath, is utilize optics to be extracted by the single-pathway of light path specifically.
Background technology
Multipath problem is one of subject matter of space optical communication, due to the reflective of object in space and diffusion, the light signal causing receiver to receive is the superposition that the light such as direct light are added in reverberation and diffusion, due to different paths, distance is different, there is difference the time arriving receiver, causes signal ambiguity, even forms interference.
Fudan University investigated visible ray high speed optical communication system, up to 3Gbit, but can only communicate with direct light, once light source shielding, is just difficult to communication; For solving this kind of problem, diffusion or reverberation communication must be utilized, but way like this, and multipath problem is just following.
Method is not yet had can effectively to solve this kind of problem at present.Because wireless and optical fiber communication also have electric wave reflection to cause multipath problem, someone uses for reference the multipath problem that traditional algorithm and method overcome free-space optical communication, but luminous reflectance radio-wave reflection is many by force, the shape in space is more complicated than ribbon fiber many, so effect not obvious; Someone proposes to stop the direct light of light source, uses diffuse reflection communicating optical signals, can eliminate superposing of direct light and diffused light, but can not eliminate superposing between diffused light with diffused light.
The invention provides a kind of method and the device of avoiding space communication multipath problem, utilize optics to be extracted by single light path, compare the multipath problem effectively overcoming space optical communication.
Summary of the invention
The object of this invention is to provide a kind of single path extracting method for space optical communication, it is characterized in that: optical imagery is carried out to communication space, picture is divided into multiple district and is called pixel, region one_to_one corresponding in pixel and space, select one or several pixel as light information source, receiver decomposes light information source, filter detection and gathering.Way like this, collection point is from the light signal receiving corresponding region in space, and the less then corresponding region of pixel is less, adopts the optical imaging system that resolution is higher, desirable minimum pixel, area reduction then in space is to being almost a little, then receiver can only collect the light that this point sends, if this point is light source, then can only gather the direct projection light that this point sends, if this non-light source, then can only gather reflection or diffused ray that this point sends, comparatively efficiently avoid multipath problem.
The object of this invention is to provide a kind of single path extraction device for space optical communication, i.e. optical prism, its feature is, the optical imaging system formed with the axisymmetric lens of light by four pieces, and the first lens are convex in object space positive lens; Second lens are bi-concave negative lens; 3rd lens are convex in object space positive lens; 4th lens are concave-concave positive lens.There are two advantages: advantage one, when space exceedes the depth of field, light is after four lens reflections, can be gathered in preferably imaging surface becomes clearly as, as a region one_to_one corresponding in upper pixel and space, arbitrarily from the same area and the light arriving optical imaging system must converge to pixel corresponding to this region, any zones of different is set out and the light arriving optical imaging system can not converge to pixel corresponding to non-one's respective area, the size in region depends on the size of the optical resolution of imaging system and the pixel of setting, pixel size can not be set as higher than optical resolution, advantage two, any light of the same area converges to pixel corresponding to this region through the identical time behind one's respective area.
Patent accompanying drawing
Fig. 1 is a kind of single path extracting method principle schematic for space optical communication
Fig. 2 is the lens set structural rate illustration of the imaging system that a kind of single path for space optical communication that the present invention adopts is extracted
Fig. 3 is lens set structural parameters table provided by the invention
Fig. 4 is the asphericity coefficient of lens set provided by the invention
Fig. 5 is that the single path of a kind of space optical communication provided by the invention extracts schematic diagram
Embodiment
The invention provides a kind of single path extracting method for space optical communication and device elaborates below in conjunction with the course of work of accompanying drawing to this structure, following explanation is only exemplary, instead of in order to limit the scope of the invention and apply.
The single path extracting method of embodiment 1 space optical communication
Fig. 1 is a kind of single path extracting method principle schematic for space optical communication.In figure, region [A, B], is also line segment AB, by optical imaging system imaging, is pixel [a, b], is also line segment ab; Ab is shorter, then AB is less, and namely the less then corresponding region of pixel is less, and adopt the optical imaging system that resolution is higher, desirable minimum pixel, then the area reduction in space is to being almost a little; Probe only gathers the light that pixel [a, b] sends, because this light is from region [A, B], then, probe can only pickup area [A, B] light, if [A, B] is light source in region, then what probe received is directly from the direct projection light of light source, if region [A, B] be non-light source, then what probe received is reflection or diffused ray, comparatively efficiently avoid multipath problem.
What embodiment 2 one kinds of single path for space optical communication were extracted focuses apart from optical mirror slip group
Fig. 2 is the lens set structural rate illustration of the imaging system that a kind of single path for space optical communication that the present invention adopts is extracted, and in Fig. 2, the first lens are convex in object space double-sized non-spherical positive lens; Second lens are concave-concave double-sized non-spherical negative lens; 3rd lens are convex in object space double-sized non-spherical positive lens; 4th lens are concave-concave double-sized non-spherical positive lens, parallel-plate for the protection of the imaging surface of detector, when thing exceedes the depth of field, light after four lens reflections, the imaging surface that can be gathered in detector preferably becomes clearly as.In Fig. 2, the first lens are 2 near the one side of thing, and near picture is 3; Second lens object plane is 4, and image planes are 5; 3rd lens object plane is 6, and image planes are 7, and the 4th lens object plane is 8, and image planes are 9; The object plane of parallel-plate is 10, and image planes are 11.First and third, four lens adopt E48R shaped material, refractive index 1.53116, abbe number 56.04.Second lens adopt PC material, and parallel-plate material is K9 glass, and refractive index and dispersion are respectively 1.51633 and 64.1, and at parallel-plate two plating one deck IR-cut filter membrane on the surface, improve image quality, diaphragm is positioned on object space position, before being placed in the first lens.
Fig. 3 is lens set structural parameters table provided by the invention, in Fig. 3, in lens surface one hurdle, and diaphragm, 2.....11, image planes, corresponding with diaphragm in Fig. 2,2.....11, image planes respectively.
Fig. 4 is the asphericity coefficient of lens set provided by the invention.In Fig. 4,2.....9 in a surperficial hurdle is corresponding with 2.....9 in Fig. 2 respectively.Four lens are with the axisymmetric non-spherical lens of light, and 8 aspheric surfaces meet formula (1):
Z is that k is Conic coefficient, and c is minute surface curvature of centre, c=1/R, and wherein R is minute surface center curvature radius, and c is the inverse of minute surface center curvature radius with each aspheric surface and optical axes crosspoint for starting point and directional light axial axially value; R is minute surface centre-height, and time applying equation (1), its quadratic surface coefficient k value and asphericity coefficient a1, the numerical value of a2, a3, a4, a5 can refer to Fig. 4.The Airy disc radius of this lens set, namely diffraction resolution limit size is 0.00158mm, so the desirable minimum dimension of pixel is the circle of diameter 0.00158mm, image planes size is the circle of radius 2mm, the region that minimum pixel is corresponding account for the space be imaged 1,000,000/.
The single path of embodiment 3 space optical communication is extracted
Fig. 5 is that the single path of a kind of space optical communication provided by the invention extracts schematic diagram, in Fig. 5, be from the different of Fig. 2, image planes in Fig. 2 are almost all blocked plate and cover, shadow shield only reserves two minimum holes or gap, the light that aperture or gap are appeared or enter optical fiber, or enter detector, the light entering optical fiber can detect after being derived by optical fiber further; If light is from visible ray information source LED, then a kind of situation is that detector needs to install blue light, green or ruddiness filter disc, after these filter discs filter out the luminous ray of other colors of more than 95%, then is detected by probe; In addition, detector can also install spectro-prism, is disassembled by the light of each wavelength, realize wavelength division multiplexing on space length.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (2)
1. the single path extracting method for space optical communication, it is characterized in that: optical imagery is carried out to communication space, picture is divided into multiple district and is called pixel, region one_to_one corresponding in pixel and space, select one or several pixel as light information source, receiver decomposes light information source, filter detection or gather.
2. the single path extraction device for space optical communication, i.e. optical prism, it is characterized in that, the optical imaging system formed with the axisymmetric lens of light by four pieces, first lens are convex in object space positive lens, second lens are bi-concave negative lens, and the 3rd lens are convex in object space positive lens, and the 4th lens are concave-concave positive lens.
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| CN201310756577.0A CN104753593A (en) | 2013-12-31 | 2013-12-31 | Single-route extracting method and device for space photo-communication |
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| CN101241224A (en) * | 2007-02-09 | 2008-08-13 | 亚洲光学股份有限公司 | Microminiature lens |
| JP4454731B2 (en) * | 1999-09-21 | 2010-04-21 | キヤノン株式会社 | Zoom lens |
| CN102122058A (en) * | 2011-03-08 | 2011-07-13 | 东莞长安谷崧塑胶零件模具厂 | Varifocal optical system |
| CN102645749A (en) * | 2012-04-21 | 2012-08-22 | 张家港鹏博光电科技有限公司 | Magnification regulating method of projection optical system |
| CN102841432A (en) * | 2011-06-20 | 2012-12-26 | 大立光电股份有限公司 | Image pickup optical system |
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Patent Citations (5)
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|---|---|---|---|---|
| JP4454731B2 (en) * | 1999-09-21 | 2010-04-21 | キヤノン株式会社 | Zoom lens |
| CN101241224A (en) * | 2007-02-09 | 2008-08-13 | 亚洲光学股份有限公司 | Microminiature lens |
| CN102122058A (en) * | 2011-03-08 | 2011-07-13 | 东莞长安谷崧塑胶零件模具厂 | Varifocal optical system |
| CN102841432A (en) * | 2011-06-20 | 2012-12-26 | 大立光电股份有限公司 | Image pickup optical system |
| CN102645749A (en) * | 2012-04-21 | 2012-08-22 | 张家港鹏博光电科技有限公司 | Magnification regulating method of projection optical system |
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| 黄星星等: "基于MIMO技术的可见光通信模型和技术分析", 《光通信研究》 * |
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