CN112653519A - Underwater wireless optical communication intelligent rapid alignment system and alignment method - Google Patents
Underwater wireless optical communication intelligent rapid alignment system and alignment method Download PDFInfo
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- CN112653519A CN112653519A CN202011488876.7A CN202011488876A CN112653519A CN 112653519 A CN112653519 A CN 112653519A CN 202011488876 A CN202011488876 A CN 202011488876A CN 112653519 A CN112653519 A CN 112653519A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention relates to an underwater wireless light intelligent fast alignment system and an alignment method, which are suitable for intelligent fast alignment between receiving and transmitting devices of an underwater wireless light communication system, and can also be applied to fast alignment between space light receiving and transmitting devices in the air to realize fast and normal communication of the wireless light communication system. The device can realize the quick alignment between the light emitting device and the light receiving device of the underwater wireless optical communication system, establish a communication link and realize the quick and normal communication of the system. Compared with the traditional manual alignment method, the alignment difficulty is reduced, the alignment time is saved, and the working efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of wireless optical communication, and relates to an underwater wireless optical intelligent rapid alignment method.
Background
In a wireless optical communication system, before communication between a transmitting device and a receiving device, the alignment of an optical path is required to realize normal communication of the system, so that the timely transmission of information and the performance of the communication system are ensured. Therefore, achieving optical path alignment between the transmitting device and the receiving device is a primary task and key technology for the wireless optical communication system to achieve communication.
Wireless optical communication systems are generally classified into LED optical communication systems and LD optical communication systems according to the difference of light sources. For an LED optical communication system, the width of a light beam of emitted light is wide, the emission angle is large, after long-distance transmission, light spots are greatly expanded, and a receiving device can easily receive optical signals. However, the LED is fluorescent, has wide spectral line bandwidth and low modulation rate, and is suitable for short-distance and small-capacity transmission systems. For a large-capacity and long-distance transmission system, a light source must select an LD, the LD emits laser light, and the laser light has good monochromaticity, good directivity and high modulation rate. For a long-distance laser communication system, generally, in order to meet the requirement of long-distance optical signal detection and prevent the reduction of signal energy per unit area due to beam expansion, the laser communication system does not adopt a method of expanding the beam of a light source. Because the size of the light spot is only millimeter-scale, after the light spot is transmitted in a long distance of hundred-scale, the size of the photosensitive surface of the light receiving device of the light receiving end is small, and generally, in millimeter-scale, the light signal is difficult to receive. Particularly, in an underwater wireless optical communication system, the alignment difficulty is higher due to the influence of environmental factors such as ocean currents and the like because the underwater operation difficulty is higher. Therefore, the alignment of the optical paths between the optical transceivers of the underwater long-distance laser communication system is a difficult problem.
At present, the method adopted for aligning the underwater wireless light transceiver is manual alignment, the position of the transceiver is adjusted manually, and whether the alignment is carried out is judged by judging the strength of the light signal of a receiving end. Therefore, a new alignment method is urgently needed to solve the problem of fast alignment between optical transceivers in an underwater wireless optical communication system.
Disclosure of Invention
The technical problem solved by the invention is as follows: in order to solve the technical problem that the alignment difficulty of optical signals between optical transceiver devices in the existing underwater wireless optical communication system is high, the patent provides an underwater wireless optical intelligent rapid alignment device, and the rapid alignment of the optical signals between the optical transceiver devices in the underwater wireless optical communication system is solved through an intelligent linkage control method of a transceiver end, a communication link is established, and the rapid and normal communication of the system is realized.
The technical scheme of the invention is as follows: an underwater wireless light intelligent rapid alignment system comprises a transmitting assembly and a receiving assembly;
the transmitting assembly comprises a first bracket, a first control holder, a light emitting device, a first base, a laser indicator and a distance measuring telescope; the first control holder is fixedly connected with the light emitting device, and the optical axes of the first control holder, the light emitting device, the laser indicator and the distance measuring telescope are parallel;
the receiving assembly comprises a second support, a second control holder, a light receiving device, a second base and a target; the second base is connected with the second support, the second control cloud platform, the light receiving device and the target are positioned on the second support, the second control cloud platform is fixedly connected with the light receiving device, and the optical axes of the second control cloud platform, the light receiving device and the target are parallel;
the light emitting device and the light receiving device are respectively externally connected with a control computer.
The further technical scheme of the invention is as follows: an alignment method of an underwater wireless light intelligent rapid alignment system comprises the following steps:
step 1: aligned in air. The specified distance of horizontal distance adjustment between the light emitting device and the light receiving device is the same as the height of the light emitting device and the light receiving device from the ground, the light emitting device and the light receiving device are electrified, the light emitting device and the light receiving device are adjusted, light spots emitted by the light emitting device fall on the center of the light receiving device, and the position is kept fixed;
step 2: and (5) underwater alignment preparation. Putting the transmitting end and the receiving end into water integrally at the same time according to the adjusted state in the step 1, observing through a ranging telescope, and adjusting the horizontal distance between the light emitting device and the light receiving device to be a designated distance; the distance between the light emitting device and the light receiving device and the water surface is equal through scales marked on the first support and the second support; turning on the power supply of the light emitting device, the light receiving device and the laser pointer, and observing the position of light emitted by the laser pointer on the target;
and step 3: underwater coarse alignment, including adjustment in the horizontal and pitch directions:
wherein the adjustment of the horizontal direction comprises the following steps:
step 3.1: the computer controls the first control holder to rotate and adjust for a plurality of times in the horizontal direction at an angle of 1 degree, so that the first control holder drives the light emitting device to move in the same direction and angle. The maximum adjusting range of the step is +/-30 degrees of the position of the step 3;
step 3.2: the optical receiving device receives an optical signal, a control computer connected with the optical receiving device reads and records the optical power value of each angle point, the maximum value point of the optical power received by the optical receiving device in all the recorded values is found out by comparing with all the optical power values recorded by each angle point in the step, and the computer controls the first control holder through the RS485 serial port to adjust the position of the optical transmitting device to the position of the maximum value of the optical power value in the horizontal direction;
the adjustment of the pitch direction comprises the following steps:
step 3.1: the computer controls the first control holder to rotate and adjust in the pitching direction for a plurality of times at an angle of 1 degree, so that the first control holder drives the light emitting device to move in the same direction and angle. The maximum adjusting range of the step is +/-10 degrees of the position of the step 3;
step 3.2: the optical receiving device receives the optical signal, a control computer connected with the optical receiving device reads and records the optical power value of each angle point, the maximum value point of the optical power received by the optical receiving device in all the recorded values is found out by comparing with all the optical power values recorded by each angle point in the step, and the computer controls the first control holder through the RS485 serial port to adjust the position of the optical transmitting device to the position of the maximum value of the optical power value in the pitching direction;
and 4, step 4: and (3) underwater fine alignment, which also comprises horizontal direction adjustment and pitching direction adjustment, wherein the adjustment angle is smaller than the adjustment angle in the step (3) (the angle is 0.01-0.1), and the alignment degree of the optical signal is further realized. When the transceiver reaches fine alignment, the green light emitted by the laser pointer should fall at the center of the target. The maximum adjustment range of the step is +/-5 degrees of the position of the step 3.
The further technical scheme of the invention is as follows: the step size in step 3.1 is in the range of 0.1 ° to 1 °.
The further technical scheme of the invention is as follows: the step size in the step 4 is in the range of 0.01-0.1 deg.
The further technical scheme of the invention is as follows: the absolute positioning accuracy of the first control holder can reach 0.01 degrees, the repeated positioning accuracy can reach 0.005 degrees, the maximum speed is 15 degrees/second, the horizontal rotation angle range is +/-160 degrees, and the pitching adjustment range is +/-20 degrees.
The further technical scheme of the invention is as follows: the absolute positioning accuracy of the second control holder can reach 0.01 degrees, the repeated positioning accuracy can reach 0.005 degrees, the maximum speed is 15 degrees/second, the horizontal rotation angle range is +/-160 degrees, and the pitching adjustment range is +/-20 degrees.
Effects of the invention
The invention has the technical effects that: the device is suitable for intelligent rapid alignment between receiving and transmitting devices of an underwater wireless optical communication system, and can also be applied to rapid alignment between space optical receiving and transmitting devices in the air, so that rapid normal communication of the wireless optical communication system is realized. The device can realize the quick alignment between the light emitting device and the light receiving device of the underwater wireless optical communication system, establish a communication link and realize the quick and normal communication of the system. Compared with the traditional manual alignment method, the manual alignment needs about 1 hour, and the alignment can be completely aligned within 10 minutes by using the alignment device. The alignment difficulty is reduced, the alignment time is saved, and the working efficiency is improved.
Drawings
FIG. 1: underwater wireless light intelligent rapid alignment device composition block diagram
FIG. 2: structure schematic diagram of underwater wireless light intelligent rapid alignment device
FIG. 3: working principle schematic diagram of underwater wireless light intelligent rapid alignment device
Description of reference numerals: 1-a first scaffold; 2-a first control head; 3-a light emitting device; 5-a second support; 6-a second control console; 7-a light receiving device; 9-laser pointer; 10-a range telescope; 11-target.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Referring to fig. 1-3, the underwater wireless light intelligent fast alignment device comprises a transmitting end and a receiving end, wherein the transmitting end and the receiving end are both composed of a mounting bracket, a high-precision pan-tilt and an intelligent control computer, a laser indicator and a distance measuring telescope are mounted on the upper portion of the transmitting end, and a target is mounted on the upper portion of the receiving end. Before use, a pair of customized high-precision control holders are respectively arranged on the supports at two ends; and then the transmitting device and the receiving device of the wireless optical communication system are respectively arranged on the brackets at the two ends, and the heights of the transmitting device and the receiving device from the ground are the same. Firstly, aligning a transmitting device and a receiving device in the air, and then integrally putting the transmitting end and the receiving end into the water at the same time for alignment. The transmitting device and the receiving device have the same underwater depth, after the transmitting device and the receiving device are electrified and normally work, the transmitting end firstly controls the horizontal rotation of the holder at a larger angle along the horizontal direction, the rotation of the holder drives the light transmitting device to synchronously rotate, the light connecting end reads the light power value of each angle point and compares the light power value with all recorded light power values, the position point with the maximum light power value is taken and is in linkage control with the transmitting end, and the light transmitting device is adjusted to the position with the maximum light power; and then the transmitting end controls the holder to rotate up and down along the pitching direction by a larger step length, and the transmitting end determines and adjusts the position of the maximum optical power in the pitching direction in the same way as the horizontal direction. After the coarse adjustment is finished, fine adjustment in the horizontal direction and the pitching direction is performed, the method is the same as the coarse adjustment method, only the moving step length is small, and the moving step length can be adjusted according to actual needs. Further achieving the degree of alignment of the optical signals. After the coarse adjustment and the fine adjustment are finished, the optimal alignment position of the system is realized, and the alignment process is finished. Referring to fig. 3, before alignment, the light emitting device 3 of the wireless optical communication system is mounted on the emitting end mounting bracket 1, the light receiving device 7 is mounted on the receiving bracket 5, and then the pair of high- precision control holders 2 and 6 are mounted on the brackets 1 and 6, respectively. The high-precision control holder is respectively connected with an intelligent control computer.
In this embodiment, the alignment method for the alignment apparatus includes the following steps:
step 1: aligned in air. The specified distance of horizontal distance adjustment between the light emitting device 3 and the light receiving device 7 is the same as the height of the light emitting device 3 and the light receiving device 7 from the ground, the light emitting device 3 and the light receiving device 7 are electrified, the light emitting device 3 and the light receiving device 7 are adjusted, so that a blue-green laser spot emitted by the light emitting device 3 falls on the center of the light receiving device 7, and the position is kept fixed; in the embodiment, the height between the two is 20 cm; in this embodiment, the transmitting device is a high-power blue-green laser, and the receiving device is a high-speed high-sensitivity APD optical receiver.
Step 2: and (5) underwater alignment preparation. And (3) putting the transmitting end and the receiving end into the water integrally at the same time according to the state adjusted in the step (2), observing through a ranging telescope (10), and adjusting the horizontal distance between the light emitting device (3) and the light receiving device (7) to be a designated distance. The distance between the light emitting device 3 and the light receiving device 7 from the water surface is made equal by the scales marked on the first bracket 1 and the second bracket 5. Turning on the power supply of the light emitting device 3, the light receiving device 7 and the laser pointer 9, observing the position of the green light emitted by the laser pointer 9 on the target 11; in the embodiment, the distance between the light emitting device 3 and the light receiving device 7 and the water surface is 20cm-50 cm;
and step 3: underwater coarse alignment, including adjustment in the horizontal and pitch directions:
wherein the adjustment of the horizontal direction comprises the following steps:
step 3.1: the computer controls the first control holder 2 to rotate and adjust for a plurality of times in the horizontal direction at an angle of 1 degree, so that the first control holder 2 drives the light emitting device 3 to move in the same direction and angle. The maximum adjusting range of the step is +/-30 degrees of the position of the step 3;
step 3.2: the light receiving device 7 receives the light signal, the control computer connected with the light receiving device 7 reads and records the light power value of each angle point, the maximum light power point received by the light receiving device 7 in all the recorded values is found by comparing with all the light power values recorded by each angle point in the step, and the computer controls the first control holder 2 through the RS485 serial port to adjust the position of the light emitting device to the position of the maximum light power value in the horizontal direction;
the adjustment of the pitch direction comprises the following steps:
step 3.1: the computer controls the first control holder 2 to rotate and adjust in the pitching direction for a plurality of times at an angle of 1 degree, so that the first control holder 2 drives the light emitting device 3 to move in the same direction and angle. The maximum adjusting range of the step is +/-10 degrees of the position of the step 3;
step 3.2: the light receiving device 7 receives the light signal, the control computer connected with the light receiving device 7 reads and records the light power value of each angle point, the maximum light power point received by the light receiving device 7 in all the recorded values is found by comparing with all the light power values recorded by each angle point in the step, and the computer controls the first control holder 2 through the RS485 serial port to adjust the position of the light emitting device to the maximum light power value position in the pitching direction;
and 4, step 4: and (3) underwater fine alignment, which also comprises horizontal direction adjustment and pitching direction adjustment, wherein the adjustment angle is smaller than the adjustment angle in the step (3) (the angle is 0.01-0.1), and the alignment degree of the optical signal is further realized. When the transceiver reaches the fine alignment, the green light emitted from the laser pointer 9 should fall at the center position of the target 11. The maximum adjusting range of the step is +/-5 degrees of the position of the step 3;
wherein the step size in step 3.1 is in the range of 0.1 to 1. The step size in the step 5 is in the range of 0.01-0.1 deg. The absolute positioning accuracy of the first control holder 2 can reach 0.01 degrees, the repeated positioning accuracy can reach 0.005 degrees, the maximum speed is 15 degrees/second, the horizontal rotation angle range is +/-160 degrees, and the pitching adjustment range is +/-20 degrees.
The absolute positioning accuracy of the second control holder 6 can reach 0.01 degrees, the repeated positioning accuracy can reach 0.005 degrees, the maximum speed is 15 degrees/second, the horizontal rotation angle range is +/-160 degrees, and the pitching adjustment range is +/-20 degrees.
Claims (6)
1. An underwater wireless light intelligent rapid alignment system is characterized by comprising a transmitting assembly and a receiving assembly;
the transmitting assembly comprises a first bracket (1), a first control holder (2), a light transmitting device (3), a first base (4), a laser indicator (9) and a distance measuring telescope (10); the first base (4) is connected with the first support (1), the first control cloud platform (2), the light emitting device (3), the laser sighting device (9) and the distance measuring telescope (10) are positioned on the first support (1), the first control cloud platform (2) is fixedly connected with the light emitting device (3), and the optical axes of the first control cloud platform (2), the light emitting device (3), the laser indicator (9) and the distance measuring telescope are parallel;
the receiving assembly comprises a second bracket (5), a second control holder (6), a light receiving device (7), a second base (8) and a target (11); the second base (8) is connected with the second support (5), the second control cloud platform (6), the light receiving device (7) and the target (11) are positioned on the second support (5), the second control cloud platform (6) is fixedly connected with the light receiving device (7), and the optical axes of the second control cloud platform (6), the light receiving device (7) and the target (11)) are parallel;
the light emitting device (3) and the light receiving device (7) are respectively externally connected with a control computer.
2. The alignment method of the underwater wireless optical intelligent rapid alignment system based on claim 1 is characterized by comprising the following steps:
step 1: aligned in air. The specified distance of horizontal distance adjustment between the light emitting device (3) and the light receiving device (7) is the same as the height of the light emitting device (3) and the light receiving device (7) from the ground, the light emitting device (3) and the light receiving device (7) are electrified, the light emitting device (3) and the light receiving device (7) are adjusted, light spots emitted by the light emitting device (3) fall on the center of the light receiving device (7), and the position is kept fixed;
step 2: and (5) underwater alignment preparation. Putting the transmitting end and the receiving end into water integrally at the same time according to the state adjusted in the step 1, observing through a ranging telescope (10), and adjusting the horizontal distance between the light emitting device (3) and the light receiving device (7) to be a designated distance; scales marked on the first support (1) and the second support (5) enable the distance between the light emitting device (3) and the light receiving device (7) and the water surface to be equal; turning on the power supply of the light emitting device (3), the light receiving device (7) and the laser pointer (9), and observing the position of the light emitted by the laser pointer (9) on the target (11);
and step 3: underwater coarse alignment, including adjustment in the horizontal and pitch directions:
wherein the adjustment of the horizontal direction comprises the following steps:
step 3.1: the computer controls the first control holder (2) to rotate for a plurality of times in the horizontal direction at an angle of 1 degree, so that the first control holder (2) drives the light emitting device (3) to move in the same direction and angle. The maximum adjusting range of the step is +/-30 degrees of the position of the step 3;
step 3.2: the optical receiving device (7) receives optical signals, a control computer connected with the optical receiving device (7) reads and records the optical power value of each angle point, the maximum optical power value point received by the optical receiving device (7) in all the recorded values is found by comparing with all the optical power values recorded by each angle point in the step, and the computer controls the first control holder (2) through an RS485 serial port to adjust the position of the optical transmitting device to the position of the maximum optical power value in the horizontal direction;
the adjustment of the pitch direction comprises the following steps:
step 3.1: the computer controls the first control holder (2) to rotate and adjust in the pitching direction for a plurality of times at an angle of 1 degree, so that the first control holder (2) drives the light emitting device (3) to move in the same direction and angle. The maximum adjusting range of the step is +/-10 degrees of the position of the step 3;
step 3.2: the optical receiving device (7) receives optical signals, a control computer connected with the optical receiving device (7) reads and records the optical power value of each angle point, the maximum optical power value point received by the optical receiving device (7) in all the recorded values is found by comparing with all the optical power values recorded by each angle point in the step, and the computer controls the first control holder (2) through an RS485 serial port to adjust the position of the optical transmitting device to the position of the maximum optical power value in the pitching direction;
and 4, step 4: and (3) underwater fine alignment, which also comprises horizontal direction adjustment and pitching direction adjustment, wherein the adjustment angle is smaller than the adjustment angle in the step (3) (the angle is 0.01-0.1), and the alignment degree of the optical signal is further realized. When the transceiver reaches the fine alignment, the green light emitted from the laser pointer (9) should fall on the center of the target (11). The maximum adjustment range of the step is +/-5 degrees of the position of the step 3.
3. The underwater wireless optical intelligent rapid alignment method according to claim 2, wherein the step size in the step 3.1 is in a range of 0.1 ° to 1 °.
4. The underwater wireless optical intelligent rapid alignment method according to claim 2, wherein the step size in the step 4 is in a range of 0.01 ° to 0.1 °.
5. The underwater wireless optical intelligent rapid alignment method according to claim 2, wherein the absolute positioning accuracy of the first control holder (2) can reach 0.01 °, the repeated positioning accuracy can reach 0.005 °, the maximum speed is 15 °/second, the horizontal rotation angle range is ± 160 °, and the pitch adjustment range is ± 20 °.
6. The underwater wireless optical intelligent rapid alignment method according to claim 2, wherein the absolute positioning accuracy of the second control holder (6) can reach 0.01 °, the repeated positioning accuracy can reach 0.005 °, the maximum speed is 15 °/second horizontal rotation angle range is ± 160 °, and the pitch adjustment range is ± 20 °.
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