CN112235045A - Alignment device and alignment method for non-direct-view free space optical communication - Google Patents
Alignment device and alignment method for non-direct-view free space optical communication Download PDFInfo
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- CN112235045A CN112235045A CN202011002171.XA CN202011002171A CN112235045A CN 112235045 A CN112235045 A CN 112235045A CN 202011002171 A CN202011002171 A CN 202011002171A CN 112235045 A CN112235045 A CN 112235045A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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Abstract
The invention discloses an alignment device and an alignment method for non-direct-view free space optical communication. The position offset is fed back by the receiving light beam sensor, the motor controller adjusts the corresponding position of the two-dimensional reflector, and light spots of the second focusing lens positioned on one path of the transmission type on a focal plane can be completely irradiated on the surface of the photoelectric detector after being adjusted; the photoelectric detector detects the modulated optical signal, and the actual output waveform is obtained through direct observation of an oscilloscope, so that the laser communication of the non-direct-view space is completed; the problem of traditional laser communication point-to-point communication link set up difficulty is solved.
Description
Technical Field
The invention belongs to the technical field of communication methods, relates to an alignment device for non-direct-view free space optical communication, and further relates to an alignment method of the alignment device.
Background
Free space optical communication is a communication mode which takes laser as an information carrier and can realize high-speed and real-time transmission of large data volume services such as data, voice, video and the like. The optical fiber communication and other wireless communication modes are combined, and the optical fiber communication and wireless communication system has the advantages of wide frequency spectrum, high communication capacity, high potential communication rate, high anti-interference performance, good confidentiality, small wireless size, light weight, simple structure and the like. However, for free space optical communications, a prerequisite for establishing communication is that both ends of the communication achieve a perfect alignment of the light beams without occlusion. It is not easy to find a far-distance unobstructed direct-view link between buildings in a city, and for long-distance communication, the alignment of light beams usually takes a lot of time to establish the link, and because factors such as light beam drift, light intensity flicker, arrival angle fluctuation and the like can directly affect the performance of space laser communication, and in severe cases, communication can be interrupted, so that the establishment of a communication link in a non-direct-view free space is difficult.
Disclosure of Invention
The invention aims to provide an alignment device for non-direct-view free space optical communication, which can realize the laser communication of the non-direct-view free space.
The technical scheme adopted by the invention is that the alignment device for non-direct-view free space optical communication comprises a transmitting end and a receiving end, wherein the transmitting end comprises a laser, an intensity modulator, an optical fiber amplifier and a transmitting antenna which are sequentially connected, the intensity modulator is also connected with a signal source, the bottom of the transmitting antenna is provided with a two-dimensional aiming platform for aiming light beams, and the two-dimensional aiming platform is sequentially connected with a first computer and a first communication module;
the receiving end comprises a light beam sensor, a second computer and a second communication module which are connected in sequence, and the second communication module is connected with the first communication module; the two-dimensional reflector is connected with a motor controller used for controlling the two-dimensional reflector to rotate, and the motor controller is connected with a second computer; the light splitting system is also connected with a photoelectric detector and an oscilloscope.
The invention is also characterized in that:
the light splitting system comprises a light splitting mirror, the light splitting mirror is respectively connected with a first focusing lens and a second focusing lens, the first focusing lens is connected with the light beam sensor, and the second focusing lens is connected with the photoelectric detector.
The beam sensor is an infrared camera.
It is another object of the present invention to provide an alignment method for off-line-of-sight free-space optical communications.
Another technical solution adopted by the present invention is an alignment method for non-direct-view free space optical communication, which adopts the above-mentioned alignment apparatus for non-direct-view free space optical communication, and includes the following steps:
step 4, the light beam after the rough alignment is transmitted by the transmitting antenna sequentially passes through the two-dimensional reflector, the receiving antenna and the light splitting system, and then imaging is carried out on the light beam sensor;
and 6, after the precise alignment of the light beams is finished, the light beams emitted by the emitting antenna sequentially pass through the two-dimensional reflector, the receiving antenna, the light splitting system and the photoelectric detector, and then signal waveforms are output through an oscilloscope, so that the communication is finished.
The specific steps of step 3 are as follows:
3.1, capturing the light beam emitted by the emitting antenna by the light beam sensor, extracting the light spot and feeding back the light spot to a second computer, storing the light spot information by the second computer, and randomly adjusting the two-dimensional aiming platform by the first computer;
3.2, capturing and extracting the adjusted light spot by the light beam sensor and feeding the adjusted light spot back to a second computer, comparing the light spot at the current moment with the light spot at the previous moment by the second computer, and if the light spot at the current moment is larger than the light spot at the previous moment, adjusting the two-dimensional aiming platform next time according to the steps; if the light spot at the moment is smaller than the light spot at the previous moment, reversely adjusting the two-dimensional aiming platform;
and 3.3, repeating the steps 3.1-3.2 until the light spot is brightest, and finishing the rough alignment of the light beam.
The specific process of step 6 is as follows:
the light beam sensor extracts the centroid of the imaging information, the second computer calculates the centroid by adopting edge extraction and circle fitting algorithm to obtain the position (x) of the light spot at the current momentc,yc) And the central position of the beam sensor is marked as (x)0,y0) Then, the offset between the position of the light spot at the current moment and the x and y directions of the central position of the light beam sensor is (x)c-x0,yc-y0) The offset is (x)c-x0,yc-y0) And the input motor controller adjusts the two-dimensional reflector to realize the precise alignment of the light beam.
The invention has the beneficial effects that:
according to the alignment device for non-direct-view free space optical communication, the position offset is fed back through the light beam sensor, the motor controller adjusts the corresponding position of the two-dimensional reflector, and light spots of the second focusing lens positioned in one path of the transmission type on a focal plane can be completely irradiated to the surface of the photoelectric detector after being adjusted; the photoelectric detector detects the modulated optical signal, and the actual output waveform is obtained through direct observation of an oscilloscope, so that the laser communication of the non-direct-view space is completed; the alignment method of the non-direct-view free space optical communication can realize the quick coarse alignment and the fine alignment of the non-direct-view free space and solve the problem of difficult establishment of the traditional laser communication point-to-point communication link.
Drawings
FIG. 1 is a schematic diagram of the alignment apparatus for non-direct view free space optical communication of the present invention;
FIG. 2 is a waveform diagram of a signal modulated by an alignment method for non-direct-view free-space optical communication according to the present invention;
FIG. 3 is an image of a light beam during alignment of a method for alignment of non-line-of-sight free-space optical communications according to the present invention;
FIG. 4 is an image of a light spot aligned by the alignment method of non-direct-view free-space optical communication according to the present invention;
FIG. 5a is an image of an infrared camera spot under a first turbulence condition in an alignment method for non-direct-view free-space optical communication according to the present invention;
FIG. 5b is an image of an infrared camera spot under a second turbulence condition in an alignment method for non-direct-view free-space optical communication according to the present invention;
FIG. 5c is an image of an infrared camera spot under a third turbulence condition in an alignment method for non-direct-view free-space optical communication according to the present invention;
FIG. 6a is a diagram of unaligned spots with a first bias in the x-direction in an alignment method for non-direct-view free-space optical communication according to the present invention;
FIG. 6b is a diagram of unaligned spots with a second bias in the x-direction in an alignment method for non-direct-view free-space optical communications according to the present invention;
FIG. 6c is a diagram of the unaligned spots with a third bias in the x-direction in an alignment method for non-direct-view free-space optical communication according to the present invention;
FIG. 7a is a misalignment spot with a first bias in the y-direction in an alignment method for non-direct-view free-space optical communications according to the present invention;
FIG. 7b is a diagram of unaligned spots with a second bias in the y-direction in an alignment method for non-direct-view free-space optical communications according to the present invention;
FIG. 7c is a diagram of the misaligned spots with a third bias in the y-direction in an alignment method for non-line-of-sight free-space optical communications according to the present invention;
fig. 8 is an algorithmic schematic of a motor controller in an alignment method for non-line-of-sight free-space optical communications according to the present invention.
In the figure, 1, a laser, 2, an intensity modulator, 3, a fiber amplifier, 4, a transmitting antenna, 5, a signal source, 6, a two-dimensional aiming platform, 7, a first communication module, 8, a first computer, 9, a beam sensor, 10, a second computer, 11, a second communication module, 12, a two-dimensional reflector, 13, a receiving antenna, 14, a spectroscope, 15, a first focusing lens, 16, a second focusing lens, 17, a photoelectric detector, 18, an oscilloscope and 19, and a motor controller.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
An alignment device for non-direct-view free space optical communication comprises a transmitting end and a receiving end, wherein the transmitting end comprises a laser 1, an intensity modulator 2, an optical fiber amplifier 3 and a transmitting antenna 4 which are sequentially connected, the intensity modulator 2 is further connected with a signal source 5, the signal source 5 generates square wave signals and loads the square wave signals to the intensity modulator 2 in the form of electrical information, the intensity of output optical signals is changed by changing the electro-optical characteristic of lithium niobate crystals in the modulator in an external modulation mode, and therefore the signal source can be directly loaded to the intensity of the optical signals to complete signal modulation. The bottom of the transmitting antenna 4 is provided with a two-dimensional aiming platform 6 for aiming light beams, and the two-dimensional aiming platform 6 is sequentially connected with a first computer 8 and a first communication module 7; the laser 1, the intensity modulator 2, the optical fiber amplifier 3 and the transmitting antenna 4 are connected by optical fibers, and the signal source 5 and the intensity modulator 2 are connected by radio frequency wires.
The receiving end comprises a light beam sensor 9, a second computer 10 and a second communication module 11 which are connected in sequence, and the light beam sensor 9 is an infrared camera. The second communication module 11 is connected with the first communication module 7 by a signal data line; the first communication module 7 and the second communication module 11 are both GSM modules. The two-dimensional reflecting mirror is characterized by further comprising a two-dimensional reflecting mirror 12, a receiving antenna 13 and a light splitting system which are sequentially connected, wherein the light splitting system is connected with the light beam sensor 9, the two-dimensional reflecting mirror 12 is connected with a motor controller 19 used for controlling the two-dimensional reflecting mirror to rotate, and the motor controller 19 is connected with a second computer 10; the light splitting system is also connected with a photoelectric detector 17 and an oscilloscope 18. The light beam sensor 9, the second computer 10, the second communication module 11 and the motor controller 19 are connected by signal data lines, and the photoelectric detector 17 and the oscilloscope 18 are connected by radio frequency lines.
The light splitting system comprises a light splitting mirror 14, the light splitting mirror 14 is respectively connected with a first focusing lens 15 and a second focusing lens 16, the first focusing lens 15 is connected with the light beam sensor 9, and the second focusing lens 16 is connected with a photoelectric detector 17.
A non-direct-view free space optical communication alignment method adopts the non-direct-view free space optical communication alignment device, and comprises the following steps:
3.1, capturing the light beam emitted by the emitting antenna 4 by the light beam sensor 9, extracting a light spot and feeding the light spot back to the second computer 10, storing the light spot information by the second computer 10 to be recorded as the light spot 1, sending a signal to the first computer 20 through the second communication module 11 and the first communication module 7, and randomly adjusting the two-dimensional aiming platform 6 by the first computer 20;
3.2, the light beam sensor 9 captures and extracts the adjusted light spot and feeds the light spot back to the second computer 10 to be recorded as a light spot 2, the second computer 10 compares the light spot 2 at the current moment with the light spot 1 at the previous moment, and if the light spot 2 is larger than the light spot 1, the two-dimensional aiming platform 6 is adjusted next time according to the steps; if the light spot 2 is smaller than the light spot 1, the two-dimensional aiming platform 6 is reversely adjusted;
and 3.3, repeating the steps 3.1-3.2 until the light spot is brightest, and finishing the rough alignment of the light beam.
Step 4, after the light beam emitted by the emitting antenna 4 after coarse alignment passes through the two-dimensional reflector 12, the receiving antenna 13, the spectroscope 14 and the first focusing lens 15 in sequence, imaging is carried out on the light beam sensor 9, as shown in fig. 3;
due to the influence of atmospheric turbulence, laser generates wavefront distortion after being transmitted in a long distance, so that an infrared camera positioned on a beam focal plane does not form a non-regular circular light spot during imaging. As shown in fig. 5a-5c, the images of the infrared camera at the focal plane under different turbulence conditions show more significant irregularities as the turbulence intensity increases. The spot on the beam sensor 9 is processed.
Specifically, the light beam sensor 9 extracts the centroid of the imaging information, as shown in fig. 6a to 6c and fig. 7a to 7c, the red point represents the center of the position of the infrared camera, and the second computer 10 calculates the centroid by edge extraction and circle fitting algorithm to obtain the position (x) of the light spot at the current timec,yc) And the center position of the beam sensor 9 is marked as (x)0,y0) Then, the offset between the position of the light spot at the current moment and the x and y directions of the central position of the light beam sensor 9 is (x)c-x0,yc-y0) The offset is (x)c-x0,yc-y0) The input motor controller 19 adjusts the two-dimensional reflecting mirror 12 to realize the fine alignment of the light beam. The alignment algorithm principle of the motor controller 19 is shown in fig. 8.
Through the mode, the alignment device for non-direct-view free space optical communication disclosed by the invention has the advantages that the position offset is fed back through the light beam sensor, the motor controller adjusts the corresponding position of the two-dimensional reflector, and the light spot of the second focusing lens positioned in one transmission path on the focal plane can be completely irradiated onto the surface of the photoelectric detector after being adjusted; the photoelectric detector detects the modulated optical signal, and the actual output waveform is obtained through direct observation of an oscilloscope, so that the laser communication of the non-direct-view space is completed; the alignment method of the non-direct-view free space optical communication can realize the quick coarse alignment and the fine alignment of the non-direct-view free space and solve the problem of difficult establishment of the traditional laser communication point-to-point communication link.
Claims (6)
1. The aligning device for the non-direct-view free space optical communication is characterized by comprising a transmitting end and a receiving end, wherein the transmitting end comprises a laser (1), an intensity modulator (2), an optical fiber amplifier (3) and a transmitting antenna (4) which are sequentially connected, the intensity modulator (2) is further connected with a signal source (5), a two-dimensional aiming platform (6) for aiming light beams is arranged at the bottom of the transmitting antenna (4), and the two-dimensional aiming platform (6) is sequentially connected with a first computer (8) and a first communication module (7);
the receiving end comprises a light beam sensor (9), a second computer (10) and a second communication module (11) which are sequentially connected, and the second communication module (11) is connected with the first communication module (7); the device is characterized by further comprising a two-dimensional reflector (12), a receiving antenna (13) and a light splitting system which are sequentially connected, wherein the light splitting system is connected with the light beam sensor (9), the two-dimensional reflector (12) is connected with a motor controller (19) used for controlling the two-dimensional reflector to rotate, and the motor controller (19) is connected with a second computer (10); the light splitting system is also connected with a photoelectric detector (17) and an oscilloscope (18).
2. The alignment device for non-direct view free-space optical communication according to claim 1, wherein the beam splitting system comprises a beam splitter (14), the beam splitter (14) is connected with a first focusing lens (15) and a second focusing lens (16), respectively, the first focusing lens (15) is connected with the beam sensor (9), and the second focusing lens (16) is connected with the photodetector (17).
3. The alignment device for off-line direct view free space optical communication of claim 1, wherein the beam sensor (9) is an infrared camera.
4. A method of alignment for off-line-of-sight free-space optical communications, using the apparatus for alignment for off-line-of-sight free-space optical communications of claim 1, comprising the steps of:
step 1, information source information sent by the signal source (5) is loaded to an intensity modulator (2) in the form of square-wave electric signals, and intensity external modulation is carried out on laser signals sent by the laser (1) to obtain modulation signals;
step 2, the modulation signal is amplified by an optical fiber amplifier (3) and then transmitted by the transmitting antenna (4);
step 3, the light beam sensor (9) captures the light beam emitted by the emitting antenna (4), extracts the light spot and feeds the light spot back to the second computer (10), the second computer (10) processes the light spot, and meanwhile, the first computer (20) adjusts the two-dimensional aiming platform (6) until the light spot is brightest, so that the rough alignment of the light beam is completed;
step 4, the light beam emitted by the emitting antenna (4) after coarse alignment passes through a two-dimensional reflector (12), a receiving antenna (13) and a light splitting system in sequence, and then is imaged on the light beam sensor (9);
step 5, the light beam sensor (9) extracts the mass center of the imaging information, the imaging information is processed by the second computer (10) and then fed back to the motor controller (19), and the motor controller (19) adjusts the two-dimensional reflector (12) to realize precise alignment of the light beam;
and 6, after the precise alignment of the light beams is finished, the light beams emitted by the emitting antenna (4) sequentially pass through the two-dimensional reflector (12), the receiving antenna (13), the light splitting system and the photoelectric detector (17), and then signal waveforms are output through the oscilloscope (18), so that the communication is finished.
5. The method for alignment of off-line direct view free space optical communication according to claim 4, wherein the specific steps of step 3 are as follows:
3.1, capturing the light beam emitted by the emitting antenna (4) by the light beam sensor (9), extracting a light spot and feeding the light spot back to a second computer (10), storing the light spot information by the second computer (10), and randomly adjusting the two-dimensional aiming platform (6) by the first computer (20);
3.2, the light beam sensor (9) captures and extracts the adjusted light spot and feeds the light spot back to a second computer (10), the second computer (10) compares the light spot at the current moment with the light spot at the previous moment, and if the light spot at the current moment is larger than the light spot at the previous moment, the two-dimensional aiming platform (6) is adjusted next time according to the steps; if the light spot at the moment is smaller than the light spot at the previous moment, the two-dimensional aiming platform (6) is reversely adjusted;
and 3.3, repeating the steps 3.1-3.2 until the light spot is brightest, and finishing the rough alignment of the light beam.
6. The method for alignment of off-line direct view free space optical communication according to claim 4, wherein the specific process of step 6 is as follows:
the light beam sensor (9) extracts the centroid of the imaging information, and the second computer (10) calculates the centroid by adopting edge extraction and circle fitting algorithm to obtain the position (x) of the light spot at the current momentc,yc) And the central position of the beam sensor (9) is marked as (x)0,y0) The offset of the position of the light spot at the current moment and the offset of the central position of the light beam sensor (9) in the x and y directions is (x)c-x0,yc-y0) The offset is (x)c-x0,yc-y0) The input motor controller (19) adjusts the two-dimensional reflector (12) to realize the precise alignment of the light beam.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113489547A (en) * | 2021-06-29 | 2021-10-08 | 西安理工大学 | Laser beam rapid alignment system and method thereof |
| CN114337815A (en) * | 2021-12-28 | 2022-04-12 | 华中科技大学 | Space optical communication terminal and system |
| WO2023244115A1 (en) * | 2022-06-17 | 2023-12-21 | Technische Universiteit Eindhoven | Bi-directional all-optical wireless communication system with autonomous optical beam steering |
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