Adaptive Regulation Device for In-cabin Optical Antenna Based on Magnetic Levitation Control

Abstract

An in-cabin optical antenna adaptive regulation device based on magnetic levitation control belongs to the field of wireless high-speed laser communication technology. To solve the problem that the system completely breaks down and cannot be adjusted after the cold backup fails in the existing technology, the device includes: an optical switch I, a transmitting collimator I, a transmitting collimator II, a reflecting mirror I, a reflecting mirror II, a receiving collimator II, a receiving collimator I, a magnetic levitation platform, an optical switch II, an optical coupler, an optical amplifier, a photodetector, a controller, and a magnetic levitation driver; there is a magnetic levitation control mechanism in the device. If the system completely breaks down and cannot be adjusted after the spatial optical transmission channel based on the pull-push reflecting mirror, it can be further adjusted through magnetic levitation control to realize and complete the functions of the optical communication system. During the regulation process of the present invention, the performance of the communication system is improved through the processes of magnetic levitation angle range scanning, the spatial optical transmission channel of the pull-push reflecting mirror, magnetic levitation displacement range scanning, and the spatial optical transmission channel of the pull-push reflecting mirror in sequence.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless high-speed laser communication, and particularly relates to an adaptive regulation device for an in-cabin optical antenna based on magnetic levitation control. Background Art

[0002] In recent years, space cameras with high spatio-temporal resolution for space-based and ground targets have become a research hotspot in the field of modern optical observation. Due to reasons such as the high spectral and high spatial resolution of existing payloads such as space cameras, the payload will generate a large number of high-pixel images or high-definition videos per unit time. Therefore, there is an urgent need for real-time transmission of massive data in the payload cabin (hundreds of gigabits per second or even higher). Currently, due to a large number of focal plane mosaics in the space camera, there are multiple-channel data streams to be output. Since there is a dynamic random rotation state between the payload cabin and the satellite cabin, and dense wavelength division multiplexing optical communication must use single-mode fiber coupling. Due to the small core diameter and numerical aperture of the single-mode fiber, the coupling efficiency is low and the anti-deflection and offset ability is insufficient under the dynamic random rotation state, resulting in poor quality of massive data transmission or even interruption.

[0003] Chinese Patent Application No. "202210116019.7", with the patent name "Inter-cabin Ultra-high-speed and High-reliability Wireless Optical Communication Device for Multiple Data under Dynamic Conditions", this device describes the overall block diagram of the in-cabin ultra-high-speed wireless optical communication device, determines the antenna conduction situation according to the telemetry before the optical amplifier, and can realize four transmission and reception channels through the space optical transmission channel based on the pull-push mirror, greatly improving the reliability of the space optical transmission channel. However, this device cannot guarantee the communication quality after the pull-push mirror. If the communication quality after the pull-push mirror is still not ideal, it will lead to the complete failure of data transmission. Therefore, this device has the problems of complete system paralysis and inability to adjust after the cold backup fails. Summary of the Invention

[0004] In order to solve the problems of complete system paralysis and inability to adjust after the cold backup fails in the prior art, the present invention proposes an adaptive regulation device for an in-cabin optical antenna based on magnetic levitation control.

[0005] The technical solution for the present invention to solve the technical problems is as follows:

[0006] An adaptive regulation device for an in-cabin optical antenna based on magnetic levitation control, the device includes: optical switch 1, transmitting collimator 1, transmitting collimator 2, mirror 1, mirror 2, receiving collimator 2, receiving collimator 1, magnetic levitation platform, optical switch 2, optical coupler, optical amplifier, photodetector, controller, and magnetic levitation driver;

[0007] The transmitting collimator 1, transmitting collimator 2, mirror 1, mirror 2, receiving collimator 2, and receiving collimator 1 constitute an optical antenna;

[0008] Both ends of the output of the first optical switch are fiber-connected to the first collimator and the second collimator respectively. The output optical axis of the first collimator and the output optical axis of the second collimator are placed at 90°. The first mirror is placed at 45° with respect to the output optical axis of the first collimator, and the reflecting surface of the first mirror faces the output optical axis of the second collimator. The second mirror is placed at -45° with respect to the output optical axis of the first mirror and there is a distance of 20 cm. The reflecting surface of the second mirror faces the input optical axis of the second receiving collimator, and the input optical axes of the first receiving collimator and the second receiving collimator are placed at 90°. The outputs of the second receiving collimator and the first receiving collimator are fiber-connected to the two input ends of the second optical switch. The magnetic levitation platform bears the second mirror, the second receiving collimator and the first receiving collimator. The output end of the second optical switch, one end of the optical coupler and the optical amplifier are fiber-connected in sequence, and the other end of the optical coupler is fiber-connected to the photodetector. The photodetector, the controller, the magnetic levitation driver and the magnetic levitation platform are connected by cables in sequence;

[0009] Normal working process: The signal light after high-speed modulation passes through the first optical switch and reaches the second collimator, and a collimated spatial signal light beam is obtained through the second collimator. The collimated spatial signal light is reflected by the first mirror and the second mirror and enters the first receiving collimator and is converted into fiber signal light. The fiber signal light is split into two by the optical coupler, and most of the light enters the optical amplifier and is amplified to the subsequent data detection system;

[0010] Cold backup switching process: Part of the light passes through the photodetector to obtain the optical power value, and it is judged whether the second collimator and the second receiving collimator are misaligned according to the optical power value. If they are misaligned, by moving the first mirror and the second mirror, the four permutation channels of the first collimator, the second collimator, the first receiving collimator and the second receiving collimator are arranged and combined to eliminate the fault;

[0011] Magnetic levitation control working process: If the optical antenna still cannot be aligned through the cold backup switching process, the controller sends an instruction to the magnetic levitation driver to drive the magnetic levitation platform to complete the magnetic levitation angle and displacement scanning alignment until the second collimator and the second receiving collimator are aligned.

[0012] A control method for an in-cabin optical antenna adaptive regulation device based on magnetic levitation control, characterized in that the method includes the following steps:

[0013] Step 1, eliminate the fault through cold backup;

[0014] Judge whether the second collimator and the second receiving collimator are aligned according to the optical power value of the photodetector. If the optical power value is lower than the input optical power of the optical amplifier, the cold backup switching method is adopted, that is, by moving the first mirror and the second mirror to arrange and combine the first collimator, the second collimator, the first receiving collimator and the second receiving collimator, so as to eliminate the fault;

[0015] Step 2, Magnetic levitation angle range scanning;

[0016] If the cold backup method cannot eliminate the fault, control the magnetic levitation platform according to the remote measurement of the photodetector through the controller and the magnetic levitation driver; First, the magnetic levitation platform scans at an angle from the inside out in a spiral trajectory, and the scanning range is the method for the magnetic levitation platform to achieve the maximum angle. During the scanning process, record the remote measurement and position of the photodetector; Then, control the magnetic levitation platform to the position with the maximum remote measurement of the photodetector; Finally, switch the collimator by moving mirror 1 and mirror 2 for cold backup, and determine the optimal combination according to the position with the maximum remote measurement of the photodetector.

[0017] Step 3, Magnetic levitation displacement range scanning;

[0018] First, the magnetic levitation platform scans at a displacement from the inside out in a spiral trajectory, and the scanning range is the method for the magnetic levitation platform to achieve the maximum displacement. During the scanning process, record the remote measurement and position of the photodetector; Then, control the magnetic levitation platform to the position with the maximum remote measurement of the photodetector; Finally, switch the collimator by moving mirror 1 and mirror 2 for cold backup, and determine the optimal combination according to the position with the maximum remote measurement of the photodetector.

[0019] The beneficial effects of the present invention are as follows:

[0020] In the device of the present invention, there is a magnetic levitation control mechanism. If the system completely breaks down and cannot be adjusted after the spatial optical transmission channel based on the retractable mirror, the optical path can be further adjusted through magnetic levitation control, so that the input optical power value reaches the minimum input value of the optical amplifier, and then the amplified optical signal reaches the subsequent data detection system, realizing and completing the functions of the optical communication system. Solve the risk of paralysis and inability to adjust existing in the original system.

[0021] In the method of the present invention, through the processes of magnetic levitation angle range scanning, spatial optical transmission channel of the retractable mirror, magnetic levitation displacement range scanning, and spatial optical transmission channel of the retractable mirror in sequence, the alignment of the magnetic levitation angle and displacement dimensions and the switching of the spatial optical transmission channel are completed. After multiple combinations of optical transmission channels and magnetic levitation alignment, the optical power and signal-to-noise ratio are improved, and the performance of the optical communication system is improved. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of an in-cabin optical antenna adaptive regulation device based on magnetic levitation control. Detailed Embodiment

[0023] The following will describe the embodiments of the present invention in detail with reference to the drawings.

[0024] As Figure 1As shown in the figure, the in-cabin optical antenna adaptive regulation device based on magnetic levitation control of the present invention includes: an optical switch 1, a transmitting collimator 1 2, a transmitting collimator 2 3, a reflector 1 4, a reflector 2 5, a receiving collimator 2 6, a receiving collimator 1 7, a magnetic levitation platform 8, an optical switch 2 9, an optical coupler 10, an optical amplifier 11, a photodetector 12, a controller 13, and a magnetic levitation driver 14.

[0025] The transmitting collimator 1 2, the transmitting collimator 2 3, the reflector 1 4, the reflector 2 5, the receiving collimator 2 6, and the receiving collimator 1 7 constitute an optical antenna.

[0026] The optical coupler 10 is a 1:99 one-to-two optical coupler. 1% of the light enters the photodetector 12 for measurement by the photodetector; 99% of the light enters the optical amplifier 11 for subsequent signal processing.

[0027] The photodetector 12 is a near-infrared detector with a dynamic range, and can achieve optical power detection in the range of -70 dBm to -10 dBm.

[0028] The optical amplifier 11 is an optical preamplifier with an input range ≥ 15 dB, and is a dense wavelength division multiplexing optical amplifier with a flatness ≤ 1 dB, covering the C band.

[0029] The reflector 1 4 and the reflector 2 5 are equipped with a stretching mechanism. The mechanism is a one-dimensional guide rail driven by a motor, which is used to move the reflector back and forth during the cold backup switching process to complete the spatial optical path switching.

[0030] The two output ports of the optical switch 1 are respectively fiber-connected to the transmitting collimator 1 2 and the transmitting collimator 2 3. The optical axis of the output of the transmitting collimator 1 2 and the optical axis of the output of the transmitting collimator 2 3 are placed at 90°. The reflector 1 4 is placed at 45° with respect to the optical axis of the output of the transmitting collimator 1 2, and the reflecting surface of the reflector 1 4 faces the optical axis of the output of the transmitting collimator 2 3. The reflector 2 5 is placed at -45° with respect to the optical axis of the output of the reflector 1 4 and there is a distance of 20 cm. The reflecting surface of the reflector 2 5 faces the input optical axis of the receiving collimator 2 6. The input optical axes of the receiving collimator 2 6 and the receiving collimator 1 7 are placed at 90°. The output optical fibers of the receiving collimator 2 6 and the receiving collimator 1 7 are connected to the two input ports of the optical switch 2 9. The magnetic levitation platform 8 bears the reflector 2 5, the receiving collimator 2 6, and the receiving collimator 1 7. The output end of the optical switch 2 9, the optical coupler 10, and the optical amplifier 11 are sequentially fiber-connected, and the 1% light output end of the optical coupler 10 is fiber-connected to the photodetector 12. The photodetector 12, the controller 13, the magnetic levitation driver 14, and the magnetic levitation platform 8 are sequentially cable-connected.

[0031] The working process of the in-cabin optical antenna adaptive regulation device based on magnetic levitation control of the present invention is as follows:

[0032] Normal working process: The signal light after high-speed modulation passes through the optical switch 1 and reaches the second transmitting collimator 3. The collimated spatial signal light beam is obtained through the second transmitting collimator 3. The collimated spatial signal light is reflected by the first mirror 4 and the second mirror 5 and enters the first receiving collimator 7 to be converted into fiber optic signal light. The fiber optic signal light is split into two by the optical coupler 10, and 99% of the light enters the optical amplifier 11 to be amplified for the subsequent data detection system.

[0033] Cold backup switching process: Part of the light passes through the photodetector 12 to obtain the optical power value, and it is determined whether the second transmitting collimator and the second receiving collimator are misaligned according to the optical power value. If they are misaligned, by moving the first mirror 4 and the second mirror 5, the four permutation channels of the first transmitting collimator 2, the second transmitting collimator 3, the first receiving collimator 7, and the second receiving collimator 6 are permuted to eliminate the fault.

[0034] Magnetic levitation control working process: If the optical antenna still cannot be aligned through the cold backup switching process, the controller 13 sends an instruction to the magnetic levitation driver 14 to drive the magnetic levitation platform 8 to complete the magnetic levitation angle and displacement scanning alignment until the second transmitting collimator and the second receiving collimator are aligned.

[0035] The regulation method of the in-cabin optical antenna adaptive regulation device based on magnetic levitation control, the method includes:

[0036] Step 1: Eliminate the fault through cold backup;

[0037] It is determined whether the second transmitting collimator and the second receiving collimator are aligned according to the optical power value of the photodetector 12. If the optical power value is lower than the input optical power of the optical amplifier 11, the cold backup switching method is adopted, that is, by moving the first mirror 4 and the second mirror 5 to permute the first transmitting collimator 2, the second transmitting collimator 3, the first receiving collimator 7, and the second receiving collimator 6 to eliminate the fault.

[0038] Step 2: Magnetic levitation angle range scanning;

[0039] If the cold backup method cannot eliminate the fault, the magnetic levitation platform 8 is controlled according to the telemetry of the photodetector 12 through the controller 13 and the magnetic levitation driver 14. First, the magnetic levitation platform 8 scans the angle from the inside to the outside in a spiral trajectory, and the scanning range is the method for the magnetic levitation platform 8 to achieve the maximum angle. The telemetry and position of the photodetector 12 are recorded during the scanning process. Then the magnetic levitation platform 8 is controlled to the position with the maximum telemetry of the photodetector 12. Finally, the collimator is switched by cold backup by moving the first mirror 4 and the second mirror 5, and the best combination is determined according to the position with the maximum telemetry of the photodetector 12.

[0040] Step 3: Magnetic levitation displacement range scanning;

[0041] First, the maglev platform 8 performs a displacement scan from the inside out in a spiral trajectory. The scanning range is the method for the maglev platform to achieve the maximum displacement. During the scanning process, the telemetry and position of the photodetector 12 are recorded. Then, the maglev platform 8 is controlled to the position where the telemetry of the photodetector 12 is the maximum. Finally, by moving the first mirror and the second mirror to perform cold backup switching of the collimator, the optimal combination is determined according to the position where the telemetry of the photodetector is the maximum.

[0042] In steps 2 and 3, the maglev angle range scan, the maglev displacement range scan, and the cold backup switching of the collimator can be adjusted through multiple combinations to achieve the optimal communication state.

Claims

1. An in-cabin optical antenna adaptive regulation device based on magnetic levitation control, characterized in that, The device includes: optical switch 1 (1), transmitting collimator 1 (2), transmitting collimator 2 (3), mirror 1 (4), mirror 2 (5), receiving collimator 2 (6), receiving collimator 1 (7), magnetic levitation platform (8), optical switch 2 (9), optical coupler (10), optical amplifier (11), photodetector (12), controller (13) and magnetic levitation driver (14); The transmitting collimator 1 (2), transmitting collimator 2 (3), mirror 1 (4), mirror 2 (5), receiving collimator 2 (6) and receiving collimator 1 (7) constitute an optical antenna; The two output ports of the optical switch 1 (1) are respectively fiber-connected to the transmitting collimator 1 (2) and the transmitting collimator 2 (3). The output optical axis of the transmitting collimator 1 (2) and the output optical axis of the transmitting collimator 2 (3) are placed at 90°. The mirror 1 (4) is placed at 45° with respect to the output optical axis of the transmitting collimator 1 (2), and the reflecting surface of the mirror 1 (4) faces the output optical axis of the transmitting collimator 2 (3). After the output optical axis of the mirror 1 (4) rotates clockwise by 135°, it is the normal direction of the mirror 2 (5), and there is a distance of 20 cm. The reflecting surface of the mirror 2 (5) faces the input optical axis of the receiving collimator 2 (6). The input optical axis of the receiving collimator 1 (7) and the input optical axis of the receiving collimator 2 (6) are placed at 90°. The output optical fibers of the receiving collimator 2 (6) and the receiving collimator 1 (7) are connected to the two input ports of the optical switch 2 (9). The magnetic levitation platform (8) bears the mirror 2 (5), the receiving collimator 2 (6) and the receiving collimator 1 (7). The output end of the optical switch 2 (9), one end of the optical coupler (10), and the optical amplifier (11) are successively fiber-connected, and the other end of the optical coupler (10) is fiber-connected to the photodetector (12). The photodetector (12), the controller (13), the magnetic levitation driver (14) and the magnetic levitation platform (8) are successively connected by cables; Normal working process: The signal light after high-speed modulation passes through the optical switch 1 (1) and reaches the transmitting collimator 2 (3), and a collimated spatial signal light beam is obtained through the transmitting collimator 2 (3). The collimated spatial signal light is reflected by the mirror 1 (4) and the mirror 2 (5) and enters the receiving collimator 1 (7) and is converted into fiber signal light. The fiber signal light is split into two by the optical coupler (10), and part of the light enters the optical amplifier (11) and is amplified to the subsequent data detection system; Cold backup switching process: Part of the light passes through the photodetector (12) to obtain the optical power value. According to the optical power value, it is determined whether the transmitting collimator 2 (3) and the receiving collimator 2 (6) are misaligned. If they are misaligned, by moving the mirror 1 (4) and the mirror 2 (5), the four arrangement channels of the transmitting collimator 1 (2), the transmitting collimator 2 (3) and the receiving collimator 1 (7), the receiving collimator 2 (6) are arranged and combined to eliminate the fault; Magnetic levitation control working process: If the optical antenna still cannot be aligned through the cold backup switching process, the controller (13) sends an instruction to the magnetic levitation driver (14) to drive the magnetic levitation platform (8) to complete the magnetic levitation angle and displacement scanning alignment until the alignment between the second transmitting collimator (3) and the second receiving collimator (6) is achieved.

2. The in-cabin optical antenna adaptive regulation device based on magnetic levitation control according to claim 1, wherein The optical coupler (10) is a 1:99 one-to-two optical coupler. 1% of the light enters the photodetector (12) for photodetector measurement; 99% of the light enters the optical amplifier (11) for subsequent signal processing.

3. The in-cabin optical antenna adaptive regulation device based on magnetic levitation control according to claim 1, wherein The photodetector (12) performs near-infrared detection with a dynamic range to achieve optical power detection in the range of -70 dBm to -10 dBm.

4. The in-cabin optical antenna adaptive regulation device based on magnetic levitation control according to claim 1, wherein The optical amplifier (11) is an optical preamplifier with an input range ≥ 15 dB and is a dense wavelength division multiplexing optical amplifier with a flatness ≤ 1 dB, covering the C band.

5. The in-cabin optical antenna adaptive regulation device based on magnetic levitation control according to claim 1, characterized in that, The first mirror (4) and the second mirror (5) are equipped with a stretching mechanism. The stretching mechanism is a one-dimensional guide rail driven by a motor, which is used to move the mirrors back and forth during the cold backup switching process to complete the spatial optical path switching.

6. Modulation method of the in-cabin optical antenna adaptive regulation device based on magnetic levitation control, characterized in that, This method includes the following steps: Step 1, troubleshooting through cold backup; Determine whether the alignment between the second transmitting collimator (3) and the second receiving collimator (6) is achieved according to the optical power value of the photodetector (12). If the optical power value is lower than the input optical power of the optical amplifier (11), the cold backup switching method is adopted, that is, by moving the first mirror (4) and the second mirror (5) to arrange and combine the first transmitting collimator (2), the second transmitting collimator (3) and the first receiving collimator (7), the second receiving collimator (6) to troubleshoot the problem. Step 2, magnetic levitation angle range scanning; If the cold backup method cannot troubleshoot the problem, control the magnetic levitation platform (8) through the controller (13) and the magnetic levitation driver (14) according to the telemetry measurement of the photodetector (12). First, the magnetic levitation platform (8) scans the angle from the inside out in a spiral trajectory. The scanning range is the maximum angle range that the magnetic levitation platform (8) can achieve. The telemetry measurement and position of the photodetector (12) are recorded during the scanning process. Then, the magnetic levitation platform (8) is controlled to the position with the maximum telemetry measurement of the photodetector (12). Finally, the collimators are switched through cold backup by moving the first mirror (4) and the second mirror (5), and the optimal combination is determined according to the position with the maximum telemetry measurement of the photodetector (12). Step 3, magnetic levitation displacement range scanning; First, the magnetic levitation platform (8) scans the displacement from the inside out in a spiral trajectory. The scanning range is the maximum displacement range that the magnetic levitation platform (8) can achieve. The telemetry measurement and position of the photodetector (12) are recorded during the scanning process. Then, the magnetic levitation platform (8) is controlled to the position with the maximum telemetry measurement of the photodetector (12). Finally, the collimators are switched through cold backup by moving the first mirror (4) and the second mirror (5), and the optimal combination is determined according to the position with the maximum telemetry measurement of the photodetector (12).

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