CN113568133A - Advanced aiming and precise tracking two-in-one system and light beam pointing method - Google Patents

Advanced aiming and precise tracking two-in-one system and light beam pointing method Download PDF

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CN113568133A
CN113568133A CN202110816190.4A CN202110816190A CN113568133A CN 113568133 A CN113568133 A CN 113568133A CN 202110816190 A CN202110816190 A CN 202110816190A CN 113568133 A CN113568133 A CN 113568133A
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module
reflector
auxiliary platform
actuators
fine tracking
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CN113568133B (en
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张福瑞
马跃洋
董林鹏
刘晶晶
蔚娟
李瑶
李朦
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Xian Technological University
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
    • G02B7/1821—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors for rotating or oscillating mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
    • G02B7/1822—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors comprising means for aligning the optical axis
    • G02B7/1827—Motorised alignment
    • 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
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/118—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum specially adapted for satellite communication
    • 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
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The invention relates to a two-in-one system of advanced aiming and precise tracking and a light beam pointing method, which comprises a two-in-one module, a communication light laser, a precise tracking detector, a spectroscope and an antenna, wherein the two-in-one module is used for receiving a light beam; the communication light laser, the spectroscope and the two-in-one module are linearly arranged, the fine tracking detector is arranged below the spectroscope, and the antenna is arranged above the two-in-one module; the two-in-one module comprises a first reflector module and a second reflector module, and the first reflector module is arranged above the second reflector module; the first reflector module comprises a reflecting mirror, the reflecting mirror is arranged on the upper movement auxiliary platform, the second reflector module comprises a reflector, the reflector is arranged on the lower movement auxiliary platform, and the optical axis of the upper movement auxiliary platform coincides with that of the lower movement auxiliary platform. The invention aims to simplify the light path of the APT system of the satellite optical communication terminal and reduce the volume, the quality and the power consumption of the APT system.

Description

Advanced aiming and precise tracking two-in-one system and light beam pointing method
Technical Field
The invention belongs to the technical field of satellite laser communication, and particularly relates to a two-in-one system of advanced aiming and fine tracking and a light beam pointing method.
Background
The satellite laser communication is a new technology for solving the bottleneck of satellite microwave communication due to the advantages of high communication rate, light and small terminal load and good safety. In the satellite laser communication technology, an APT system is required to carry out communication after target acquisition and stable tracking, generally, target acquisition is carried out through a rough tracking system, then target tracking is carried out through a fine tracking system, communication can be carried out after stable tracking is realized, however, the satellite laser communication distance is far, relaxation time exists in light beam transmission, a deviation angle can be caused by relative motion between a satellite and a target in the time, a forward aiming galvanometer is mostly adopted to compensate the deviation angle in the conventional APT system, fine tracking and forward aiming light beam control are mostly adopted in the early satellite laser communication system, such as an LCT laser communication terminal developed by ESA of the European space agency, a LUCE laser communication terminal developed in Japan, and a marine satellite laser communication terminal II of China. The light beam control method needs two fast reflecting mirrors, and carries out fine tracking and advance tracking in a one-mirror scanning mode, so that the volume, the quality and the power consumption (SWaP index) of an APT system are increased, the complexity of the system is increased, and the reliability of the system is reduced.
With the development of the technology, a large amount of resources are put into development of a satellite optical communication networking system at home and abroad, for example, a satellite link plan carried out by a united states SpaceX company, a world-ground integrated information network developed at present in China and the like, a large amount of satellites are needed for building a satellite optical network, on one hand, a SWaP index for restraining a satellite optical communication load is needed to control the cost, and on the other hand, the reliability and the stability of an APT system are needed to be improved. The control system of the advance aiming beam is characterized in that the bandwidth is low and is only tens of hertz generally, the stroke is relatively small compared with fine tracking and is generally within 100urad, most importantly, the wave bands of the upstream advance aiming beam and the downstream fine tracking beam are different, the communication beam generally adopts infrared light with the wavelength of 1550nm by taking inter-satellite laser communication as an example, and the acquisition and tracking adopt near infrared light with the wavelength of 808nm/830 nm. Therefore, the patent provides a light beam pointing system and a light beam pointing method which take the advance aiming light beam and the fine tracking light beam into consideration simultaneously by utilizing the characteristics of the advance aiming light beam and the fine tracking light beam control system.
The invention has the following patent: CN110971296A, a space beacon-free optical communication terminal scanning method and system combining a forward aiming mechanism and a fine pointing mechanism. The patent discloses a beacon-free capturing system and method, which utilizes the combination of an advanced aiming mechanism and a fine tracking mechanism to improve the scanning coverage and shorten the scanning time; the invention has the following patent: CN102830714A, a method for advance aiming in air-ground laser communication, which discloses a method for calculating the pointing angle of advance aiming beam by using GPS data and attitude measurement data of satellite platform. Referring to fig. 2, the above-mentioned related patents do not relate to a pointing mechanism that combines advanced aiming and fine tracking into a whole, and do not have a beneficial effect on reducing the SWaP index of the APT system. In the application, a two-stage flexible mechanism is adopted as a basic frame body, an upper stage platform bears a forward aiming beam reflector, a lower stage platform bears a fine tracking reflector, and the two beams are respectively controlled by utilizing the wave band difference of an upper beam and a lower beam. The upward reflector is high in light with the wavelength of 1550nm and high in light with the wavelengths of 808nm and 830nm, and the transmitted light is reflected on the target surface of the fine tracking detector by the reflector carried by the lower motion auxiliary platform to be subjected to fine tracking. The above related patents do not relate to a pointing mechanism that combines advanced aiming and fine tracking into a whole, and do not have a beneficial effect on reducing the SWaP index of the APT system.
In summary, in the conventional scheme, two fast mirrors are required to perform pre-aiming of the uplink communication beam and stabilization of the downlink fine tracking link beam respectively. The structure is not beneficial to reducing the light path, reducing the load volume, the mass and the power consumption, and simultaneously, the complexity of the system is increased, and the SWaP index is a key index of the satellite load. A more compact beam-directing module is needed to address these problems.
Disclosure of Invention
The invention aims to provide a two-in-one system of advanced aiming and fine tracking and a light beam pointing method, which can reduce the SWaP index of a communication load APT system.
In order to achieve the technical aim, the invention adopts the following technical scheme:
the advanced aiming and precise tracking two-in-one system comprises a two-in-one module, a communication light laser, a precise tracking detector, a spectroscope and an antenna; the communication light laser, the spectroscope and the two-in-one module are linearly arranged, the fine tracking detector is arranged below the spectroscope, and the antenna is arranged above the two-in-one module; the two-in-one module comprises a first reflector module and a second reflector module, and the first reflector module is arranged above the second reflector module; the first reflector module comprises a reflecting mirror, the reflecting mirror is arranged on the upper movement auxiliary platform, the second reflector module comprises a reflector, the reflector is arranged on the lower movement auxiliary platform, and the optical axes of the upper movement auxiliary platform and the lower movement auxiliary platform are overlapped.
Furthermore, the upper motion auxiliary platform comprises a transparent mirror chamber, a plurality of piezoelectric ceramic actuators and a transparent mirror base; the transflective mirror is arranged in the transflective mirror chamber, the plurality of piezoelectric ceramic actuators are arranged at the upper end of the transflective mirror base, and the transflective mirror chamber is flexibly connected above the plurality of piezoelectric ceramic actuators.
Furthermore, the lower motion auxiliary platform comprises a support, a flexible support rod, a plurality of voice coil motor actuators, a base and a flexible rod; the reflecting mirror is arranged in the transparent mirror base, the transparent mirror base is arranged on the support, the voice coil motor actuators are connected to the upper end of the base, the upper ends of the voice coil motor actuators are connected with the flexible rod, and the support is connected to the flexible rod.
Furthermore, a flexible supporting rod is connected with the centers of the support and the base.
Furthermore, four piezoelectric ceramic actuators and four voice coil motor actuators are arranged, the piezoelectric ceramic actuators and the voice coil motor actuators are distributed in the same mode, and the piezoelectric ceramic actuators and the voice coil motor actuators are distributed in four points at 90 degrees.
Furthermore, three piezoelectric ceramic actuators and three voice coil motor actuators are arranged, the piezoelectric ceramic actuators and the voice coil motor actuators are distributed in the same mode, and the piezoelectric ceramic actuators and the voice coil motor actuators are distributed in three points at 120 degrees.
Further, the beam pointing method of the system is as follows:
the communication light emitter emits communication light beams, and the communication light beams reach the surface of the transflective lens and are reflected after passing through the transflective lens and then are emitted out through the antenna; the downlink tracking light beam is converged through the antenna, firstly passes through the transflective mirror, then is reflected by the transflective mirror after being reflected by the fine tracking reflector, and the light beam is reflected to the target surface of the fine tracking detector.
Compared with the prior art, the invention has the advantages that:
the invention uses two layers of platforms as a carrier for bearing the advanced sighting telescope and the fine tracking reflector, uses the lower fine tracking platform to stabilize light spots and simultaneously drives the upper motion auxiliary platform to realize the stabilization of the advanced sighting beam, uses the upper motion auxiliary platform transflective mirror to realize light splitting, independently controls the advanced sighting beam and allows the fine tracking beam to penetrate, realizes the two-in-one of the fine tracking galvanometer and the advanced sighting galvanometer in a typical APT system, and simplifies the light path of the APT system, thereby reducing the volume, the quality and the power consumption.
Drawings
FIG. 1 is a schematic diagram of a beam steering process of the system of the present invention.
Fig. 2 is a system for satellite optical communication fine tracking and advanced light beam control in the prior art.
FIG. 3 is a schematic diagram of the system of the present invention.
FIG. 4 is a flow chart of beam pointing for the system of the present invention.
FIG. 5 is a detailed structural diagram of the system of the present invention.
FIG. 6 is a topological motion diagram of the system of the present invention.
In the figure, 1-a first reflector module, 2-a second reflector module, 3-a communication light laser, 4-a fine tracking detector, 5-a spectroscope, 6-an antenna, 101-a transflective mirror, 102-a transflective mirror chamber, 103-a piezoelectric ceramic actuator, 104-a transflective mirror base, 201-a reflector, 202-a bracket, 203-a flexible support rod, 204-a voice coil motor actuator, 205-a base, 206-a flexible rod.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances.
The invention provides a two-in-one system of advanced aiming and fine tracking, which utilizes two parallel pointing platforms to respectively control an uplink advanced aiming beam and a downlink fine tracking beam, wherein a reflector loaded by an upper motion auxiliary platform is high in transmission to the advanced aiming beam, and a fine tracking reflector loaded by a lower motion auxiliary platform is high in reflection to the downlink beam. The descending platform can inhibit the vibration of the fine tracking light beam and stabilize the pointing angle of the emergent advanced aiming light beam, so that the vibration inhibition of two light beams can be completed through one device, and different platforms can rotate respectively to control the pointing direction of the corresponding light beam.
Referring to fig. 1, 3 and 5, the core component of the system of the present invention is a two-in-one module, which is composed of an upper platform and a lower platform, wherein the upper motion auxiliary platform is responsible for controlling the uplink light beam, and the lower motion auxiliary platform is responsible for controlling the downlink light beam.
The upper motion auxiliary platform is loaded with a transflective mirror 101, the transflective mirror 101 is coated with a band-pass film, the high reflection of the advance aiming light is realized to control the direction of the advance aiming light beam, and the high transmission of the fine tracking light is realized to enable the fine tracking light beam to enter the lower motion auxiliary platform load reflecting mirror 201. For example, a band-pass film of an upper motion auxiliary platform film layer is highly reflective to 1550nm communication light and highly transparent to 808nm beacon light; the film system plated on the reflector of the lower motion auxiliary platform has high reflection to the beacon light with 808 nm.
Because the upper movement auxiliary platform has the shielding problem and the interference problem on the lower movement auxiliary platform, the upper movement auxiliary platform can only adopt a non-central supporting shaft type supporting mode, and the supporting mode can select uniformly distributed three-point type and four-point type supporting.
Because the precision required by advance aiming is higher, the actuator of the upper motion auxiliary platform selects the piezoelectric ceramic actuator 103, so that the upper motion auxiliary platform can be ensured to have higher resonant frequency and motion precision on the premise of meeting the angular travel.
According to the characteristics of the stroke and the control bandwidth of the lower motion auxiliary platform, the voice coil motor actuator 204 can be adopted as an actuating mode, so that the lower motion auxiliary platform can be ensured to provide a larger angular stroke to meet the pointing range of fine tracking; lower motion assistance platform at θzThe rotation of the direction, the translation in the X direction and the translation constraint in the Y direction are constrained by the flexible support rod 203.
The lower motion auxiliary platform can be selected to be provided with a central shaft type support or be provided with no central shaft type support, three-point support or four-point support can be selected, but for stable work, the support mode of the upper motion auxiliary platform and the support mode of the lower motion auxiliary platform are the same, so that the occurrence of coupling motion is avoided as much as possible.
The lower motion auxiliary platform adopts a support structure with a shaft, and the cut of the flexible support rod 203 can be in the shape of a circle, an ellipse, a hyperbola and the like.
The voice coil motor actuator 204 of the lower motion assisted platform is connected to the lower motion assisted platform support 202 by a flexible rod 206 to prevent damage to the actuator from lateral shear forces.
The specific process of the invention in specific work is shown in fig. 4:
firstly, when a system enters a fine tracking stage, a counter beacon light enters a target surface of a fine tracking detector, a terminal computer calculates a light spot miss amount and feeds the light spot miss amount back to a controller of a two-in-one module in real time, an upper motion auxiliary platform and a lower motion auxiliary platform start to deflect under the control of the controller of the two-in-one module, the position of a light spot on the fine tracking detector is controlled, data transmission is started when precision meets a communication requirement, the terminal computer calculates the angle of the rotation of the upper motion auxiliary platform according to target position information, the two-in-one module controller controls a piezoelectric ceramic actuator to stretch, and communication light beams are controlled to point ahead.
The bandwidth of the advanced reflector in the embodiment of the invention is only more than dozens of Hz generally, and the angle of each deflection is not more than 200urad generally. The bandwidth of the precise tracking galvanometer generally reaches hundreds of Hz, the pointing precision of the precise tracking galvanometer is 2urad, and the angular travel can reach several mrad. The precise tracking light beam generally adopts beacon light with the wavelength of 808nm or 830nm, and the communication light beam wavelength is generally 1550nm, and the wavelength can be changed by about 3nm in the uplink and downlink, so that the coating of the transflective mirror 1-1 can be transparent to the light with the wavelength of 808nm/830nm, the transmittance is better than more than 90%, and the reflective effect is high on the light with the wavelength of 1550 nm. The coating of the reflector 2-1 requires that the light in the wavelength band of 808nm/830nm is reflected, and the reflectivity is more than 98%.
The lower motion auxiliary platform actuating amount is obtained by resolving according to the light spot positioning error returned by the detector, the detector 4 is generally positioned by adopting a centroid method, and the calculation formula is as follows:
Figure BDA0003170193480000051
Figure BDA0003170193480000052
wherein x and y are respectively the offset of the spot centroid from the target center of the detector, g (i, j) is the gray value of the pixel point at the ith and the jth, and xiAnd yiIs the position of the pixel point.
And then calculating the declination angle of the target satellite on the optical axis according to the values of x and y and the focal length of the lens.
Assuming that the declination angles in pitch and azimuth are alpha and beta respectively,
FIG. 6 is a schematic diagram of a two-in-one beam pointing module, assuming that the fixed coordinate system of the lower motion-assisted stage is O-XYZ, and the positions of the four actuators of the fixed stage are A1、A2、A3、A4The positions of four rotor supporting points of the upper motion auxiliary platform are respectively B1、B2、B3、B4The moving coordinate system of the upper motion auxiliary platform is O1-X1Y1Z1P is the rotation center of the lower motion assisting platform relative to the flexible supporting rod 2-3, the point P and the point O are both in a fixed coordinate system, and PX'/X is assumed to be the origin of the coordinate system with the point P as the origin1，PY'∥Y1Then B can be obtained1、B2、B3、B4The positions in the coordinate system with the P point are as follows:
O1:[0 0 h2]T
B1:[d1 0 h2]T
B2:[0 d1 h2]T
B3:[-d1 0 h2]T
B4:[0 -d1 h2]T
wherein d is1Is the distance of the actuator stator from the center of the coordinate system, i.e. A1O length, in this scheme A is a symmetrical structure1O＝A2O and the position P' of the reference point P with respect to the fixed coordinate system is:
P′:[0 0 h1]T
then B1、B2、B3、B4The position in the fixed coordinate system O-XYZ can be expressed as:
B′i＝[T]Bi+P+P′
wherein [ T ] is a direction cosine matrix of the attitude of the movable platform, and the Cartesian coordinate system transformation matrix [ T ] can be expressed as:
[T]＝Rx(α)·Ry(β)·Rz(γ＝0)
wherein each of α, β and γ may be represented by O1And the rotation angle of the point P around the point P in the directions of the X axis, the Y axis and the Z axis.
Wherein R isx(α)、Ry(β)、Rz(γ ═ 0) can be represented as:
Figure BDA0003170193480000061
Figure BDA0003170193480000062
Figure BDA0003170193480000063
the lower motion-assisted platform actuator telescope length can then be calculated according to the following equation:
Figure BDA0003170193480000064
assuming that the moving coordinate system of the upper motion auxiliary platform is O2-X2Y2Z2The position of each pivot of the actuator is CiAssuming that the position of the center reference point of the upper exercise assisting platform is P2As shown in fig. 6. The rotation angles of the upper motion auxiliary platform in the azimuth direction and the pitch direction are respectively alpha2And beta2Then, according to the calculation principle of the expansion amount of the actuator of the lower motion assistance platform, the expression of each point of the moving coordinate system of the upper motion assistance platform in the fixed coordinate system of the upper motion assistance platform (i.e. the moving coordinate system of the lower motion assistance platform) can be obtained as follows:
C′i＝[T2]Ci+P2
at this time CiThe coordinates in the fixed coordinate system of the upper motion assistance platform (i.e., the moving coordinate system of the lower motion assistance platform) are
B1:[d2 0 0]T
B2:[0 d2 0]T
B3:[-d2 0 0]T
B4:[0 -d2 0]T
Wherein [ T2]Is the direction cosine matrix of the attitude of the upper motion assistance platform, [ T ]2]＝Rx(α2)·Ry(β2)·Rz(γ20) its detailed expression is:
Figure BDA0003170193480000071
Figure BDA0003170193480000072
Figure BDA0003170193480000073
assuming the upper motion-assisted platform actuator stator is in coordinate system O1-X1Y1Z1In position DiThen the upper motion assist platform actuator telescope length can be calculated according to the following equation:
Figure BDA0003170193480000074
the method can deflect the two-in-one module reflector or the transflective mirror, and realize the simultaneous operation of the single module of the fine tracking and the advance.
It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims (7)

1. The advanced aiming and precise tracking two-in-one system is characterized by comprising a two-in-one module, a communication light laser (3), a precise tracking detector (4), a spectroscope (5) and an antenna (6); the communication light laser (3), the spectroscope (5) and the two-in-one module are linearly arranged, the fine tracking detector (4) is arranged below the spectroscope (5), and the antenna (6) is arranged above the two-in-one module; the two-in-one module comprises a first reflector module (1) and a second reflector module (2), and the first reflector module (1) is arranged above the second reflector module (2); the first reflector module (1) comprises a reflecting mirror (101), the reflecting mirror (101) is arranged on the upper movement auxiliary platform, the second reflector module (2) comprises a reflector (201), the reflector (201) is arranged on the lower movement auxiliary platform, and the optical axis of the upper movement auxiliary platform coincides with that of the lower movement auxiliary platform.
2. The advanced sighting and fine tracking two-in-one system as claimed in claim 1, wherein the upper motion auxiliary platform comprises a lens chamber (102), a plurality of piezoelectric ceramic actuators (103) and a lens base (104); the lens is characterized in that the lens (101) is arranged in a lens chamber (102), the piezoelectric ceramic actuators (103) are arranged at the upper end of a lens base (104), and the lens chamber (102) is flexibly connected above the piezoelectric ceramic actuators (103).
3. The advanced aiming and fine tracking two-in-one system as claimed in claim 1 or 2, wherein the lower motion auxiliary platform comprises a bracket (202), a flexible support rod (203), a plurality of voice coil motor actuators (204), a base (205) and a flexible rod (206); the reflecting mirror (201) is arranged in the transparent mirror base (104), the transparent mirror base (104) is arranged on the support (202), the voice coil motor actuators (204) are connected to the upper end of the base (205), the upper ends of the voice coil motor actuators (204) are connected with the flexible rod (206), and the support (202) is connected to the flexible rod (206).
4. The advanced aiming and fine tracking two-in-one system as claimed in claim 3, wherein the support (202) and the center of the base (205) are connected with a flexible support rod (203).
5. The advanced aiming and fine tracking two-in-one system as claimed in claim 4, wherein four piezoelectric ceramic actuators (103) and four voice coil motor actuators (204) are arranged, and the piezoelectric ceramic actuators (103) and the voice coil motor actuators are distributed in the same way and are distributed in four points at 90 degrees.
6. The advanced aiming and fine tracking two-in-one system as claimed in claim 4, wherein three piezoelectric ceramic actuators (103) and three voice coil motor actuators (204) are arranged, and the piezoelectric ceramic actuators (103) and the voice coil motor actuators are distributed in the same manner and are distributed in three points of 120 degrees.
7. The advanced aiming and fine tracking two-in-one system as claimed in claim 1, wherein the beam pointing method of the system is as follows:
the communication light emitter (3) emits communication light beams, and the communication light beams reach the surface of the transflective mirror (101) after passing through the transflective mirror (5) and are reflected and then emitted out through the antenna (6); the downlink tracking light beams are converged through the antenna (6), firstly pass through the transflective mirror (101), then are reflected through the fine tracking reflecting mirror (201) and then are reflected by the transflective mirror (5), and the light beams are reflected to the target surface of the fine tracking detector (4).
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CN115016096A (en) * 2022-07-06 2022-09-06 中国航空制造技术研究院 Automatic alignment device and method for multi-stage reflection light path
CN116027539A (en) * 2022-12-15 2023-04-28 北京极光星通科技有限公司 Laser communication advanced aiming system and method

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