Typical laser communication system Kuder optical path installation and adjustment method based on fast reflecting mirror

Abstract

The invention discloses a typical laser communication system Kuder optical path installation and adjustment method based on a fast reflecting mirror. The method comprises the following steps: reflecting a light beam emitted by a collimator to the central position of a collimator camera through a reference reflecting mirror; the optical fiber collimator emits laser, the coarse tracking rotary table is controlled to drive the optical antenna to rotate in the azimuth direction, and the collimator camera obtains position information of emitted light spots; by adjusting the position of the fast reflecting mirror, determination of the Kuder optical path pointing rotation error reduction trend is realized, and accurate reference is provided for adjustment of the Kuder optical path. According to the method provided by the invention, the characteristics of controllability and rapidness of the fast reflecting mirror in a typical laser communication system are utilized, the defects of uncertain direction and low controllable degree caused by manual control during adjustment of the existing Kuder optical path are avoided, the adjustment effect and efficiency of the Kuder optical path are effectively improved, and the method can be widely applied to the typical laser communication system.

Description

Technical Field

[0001] The invention relates to the field of laser communication, in particular to a Kuder optical path adjustment method of a typical laser communication system based on a fast-reflecting mirror. Background Art

[0002] With the development of globalization and information technology, laser communication technology, as an emerging communication technology, uses laser as a carrier for communication. Compared with traditional microwave communication, it has the advantages of large communication capacity, fast communication rate, long transmission distance and good confidentiality. It has huge development potential. Laser communication links will definitely become the development trend of inter-satellite backbone links and even satellite networking communications.

[0003] As a typical laser communication system, the Couder laser communication system has the characteristics of small motion outer envelope and high stability of subsequent sub-optical paths compared to the cross-tracking frame and periscope laser communication systems. Pointing rotation error, as an important error source of the Couder laser communication system, has a significant impact on the capture, aiming, and tracking processes of the laser communication system. Therefore, reducing the pointing rotation error of the Couder optical path and studying and improving the Couder optical path adjustment method are of great significance to promoting the development of lightweight and miniaturized laser communication systems. In view of this situation, the present invention proposes a Couder optical path adjustment method for a typical laser communication system based on a fast-reflection mirror, which can effectively improve the Couder optical path adjustment effect and efficiency by utilizing the fast-reflection mirror in a typical laser communication system. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and provide a method for adjusting the Kude optical path of a typical laser communication system based on a fast-reflecting mirror, utilizing the controllable and fast characteristics of the fast-reflecting mirror in the typical laser communication system, avoiding the shortcomings of manual control and uncertain direction during the existing Kude optical path adjustment, effectively improving the effect and efficiency of the Kude optical path adjustment, and can be widely used in typical laser communication systems.

[0005] The technical solution of the present invention is: a method for adjusting the Kude optical path of a typical laser communication system based on a fast-reflection mirror, wherein the optical path sequence of the Kude optical path of the typical laser communication system is a fast-reflection mirror II, a PBS mirror, a color separation mirror, a fast-reflection mirror I, a λ / 4 wave plate, a Kude mirror IV, a Kude mirror III, a Kude mirror II, and a Kude mirror I;

[0006] The installation method includes the following steps:

[0007] Step 1, using a reference reflector to reflect the light beam emitted by the collimator to the center position of the camera of the collimator as a reference reference position during adjustment;

[0008] Step 2: The optical fiber collimator emits laser light, which enters the collimator through the above optical path sequence; the camera of the collimator respectively obtains and records the position information of the emitted light spot at four directions of 0°, 90°, 180°, and 270°;

[0009] Step 3, based on the emission spot position information recorded in step 2, estimate the magnitude of the Coode optical path pointing rotation error;

[0010] Step 4, traverse and adjust the position of the fast reflex mirror I and / or the fast reflex mirror II, and the camera of the collimator respectively obtains and records the position information of the emitted light spot in four directions of 0°, 90°, 180°, and 270° when the fast reflex mirror is in different positions;

[0011] Step 5, based on the emission spot position information recorded in step 4, estimate the magnitude of the Coode optical path pointing rotation error at different fast mirror positions, determine the decreasing trend of the Coode optical path pointing rotation error, and record the position of the fast mirror I and / or the fast mirror II and the corresponding emission spot position when the Coode optical path pointing rotation error is minimum;

[0012] Step 6, initialize the position of fast reflex mirror I and / or fast reflex mirror II to the center position, adjust Kuder mirror IV until the emission spot reaches the position recorded in step 5, repeat steps 1 to 3, and the adjustment is completed.

[0013] Furthermore, the magnitude of the Coode optical path pointing rotation error is estimated as follows:

[0014] σ1=(((x1-x3) 2 +(y1-y3) 2 ) 1 / 2 ) / 2

[0015] σ2=(((x2-x4) 2 +(y2-y4) 2 ) 1 / 2 ) / 2

[0016] σ max =max(σ1,σ2);

[0017] Among them, σ1 is the Coode optical path pointing rotation error at 0° and 180°, σ2 is the Coode optical path pointing rotation error at 90° and 270°, σ max is the final estimated Coode optical path pointing rotation error, taking the maximum value of σ1 and σ2; (x1, y1), (x2, y2), (x3, y3), (x4, y4) are the emission spot position information recorded by the parallel light tube camera at the four directions of 0°, 90°, 180°, and 270° respectively.

[0018] Furthermore, the position of the quick-reflection mirror is adjusted, including both pitch and azimuth directions.

[0019] The present invention also provides a typical laser communication system Couder optical path adjustment system based on a fast-reflection mirror, which is used for the typical laser communication system Couder optical path adjustment. The optical path sequence of the typical laser communication system Couder optical path is fast-reflection mirror II, PBS mirror, dichroic mirror, fast-reflection mirror I, λ / 4 wave plate, Couder mirror IV, Couder mirror III, Couder mirror II, Couder mirror I.

[0020] The installation system includes:

[0021] The first module is used to control the reference reflector to reflect the light beam emitted by the collimator to the camera center position of the collimator as a reference reference position during installation and adjustment;

[0022] The second module is used to control the optical fiber collimator to emit laser light, which enters the collimator through the above optical path sequence; the camera of the collimator is controlled to obtain and record the position information of the emitted light spot in the four directions of 0°, 90°, 180° and 270° respectively;

[0023] The third module is used to estimate the magnitude of the Coode optical path pointing rotation error according to the emission spot position information recorded by the second module;

[0024] The fourth module is used to control the traversal adjustment of the position of the fast reflex mirror I and / or the fast reflex mirror II, and the camera of the collimator obtains and records the position information of the light spot emitted in four directions of 0°, 90°, 180° and 270° when the fast reflex mirror is in different positions;

[0025] The fifth module is used to estimate the magnitude of the Coode optical path pointing rotation error at different fast mirror positions according to the emission light spot position information recorded by the fourth module, determine the decreasing trend of the Coode optical path pointing rotation error, and record the position of the fast mirror I and / or the fast mirror II and the corresponding emission light spot position when the Coode optical path pointing rotation error is the smallest;

[0026] The sixth module is used to initialize the position of the fast reflex mirror I and / or the fast reflex mirror II to the center position, control the adjustment of the Kude mirror IV until the emission spot reaches the position recorded by the fifth module, call the first module, the second module and the third module to complete the adjustment.

[0027] Furthermore, in the third and fifth modules, the magnitude of the rotation error of the Kude optical path is estimated in the following manner:

[0028] σ1=(((x1-x3) 2 +(y1-y3) 2 ) 1 / 2 ) / 2

[0029] σ2=(((x2-x4) 2 +(y2-y4) 2 ) 1 / 2 ) / 2

[0030] σ max =max(σ1,σ2);

[0031] Among them, σ1 is the Coode optical path pointing rotation error at 0° and 180°, σ2 is the Coode optical path pointing rotation error at 90° and 270°, σ max is the final estimated Coode optical path pointing rotation error, taking the maximum value of σ1 and σ2; (x1, y1), (x2, y2), (x3, y3), (x4, y4) are the emission spot position information recorded by the parallel light tube camera at the four directions of 0°, 90°, 180°, and 270° respectively.

[0032] Furthermore, in the fourth module, the position of the quick-reflection mirror is adjusted, including both pitch and azimuth directions.

[0033] The advantages of the present invention compared with the prior art are:

[0034] (1) The present invention avoids the shortcomings of uncertain direction and low controllability caused by manual control during the existing Kude optical path adjustment, and effectively improves the efficiency of Kude optical path adjustment.

[0035] (2) The present invention utilizes the controllable and fast characteristics of the fast-reflecting mirror in a typical laser communication system, and can accurately determine the decreasing trend of the pointing rotation error of the Coode optical path, provide an accurate reference for the adjustment direction of the Coode optical path, and improve the adjustment effect of the Coode optical path.

[0036] (3) The present invention utilizes a fast-reflection mirror to determine the decreasing trend of the Coode optical path pointing rotation error, and can obtain a reference for the Coode optical path adjustment at the position of the fast-reflection mirror and simultaneously calculate the magnitude of the Coode optical path pointing rotation error, thereby providing an accurate reference for the Coode optical path adjustment result. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Attached Figure 1 This is a schematic diagram of the Kude optical path adjustment optical path of the present invention;

[0038] Attached Figure 2 This is the Kude optical path installation and adjustment flow chart of the present invention.

[0039] Figure 1 The specific numbers are as follows:

[0040] 1. Kude Mirror I 2. Kude Mirror II 3. Kude Mirror III 4. Kude Mirror IV

[0041] 5. λ / 4 wave plate 6. Fast mirror I 7. Dichroic mirror 8. PBS mirror

[0042] 9. Fast mirror II 10. Fiber collimator 11. Reference reflector 12. Collimator DETAILED DESCRIPTION

[0043] In order to better understand the technical solution of the present invention, the specific implementation mode of the present invention is described in detail below with reference to the accompanying drawings.

[0044] For the typical laser communication system Kude optical path, the optical path diagram is as follows Figure 1 As shown, the order of the optical path is fast mirror II 9, PBS mirror 8, dichroic mirror 7, fast mirror 6, λ / 4 wave plate 5, Coudé mirror IV 4, Coudé mirror III 3, Coudé mirror II 2, and Coudé mirror I 1;

[0045] The system Kude optical path installation and adjustment process is as follows Figure 2 As shown, the specific steps include:

[0046] 1) The reference reflector 11 reflects the light beam emitted by the collimator 12 to the center position of the collimator camera as the reference reference position during adjustment;

[0047] 2) The fiber collimator 10 emits laser, and the coarse tracking turntable drives the optical antenna to rotate in azimuth for one circle. The camera of the collimator 12 obtains and records the emission spot position information (x1, y1), (x2, y2), (x3, y3), (x4, y4) at the four directions of 0°, 90°, 180°, and 270° respectively;

[0048] 3) The following formula is used to estimate the magnitude of the Coode optical path pointing rotation error, that is, to calculate half of the difference in the position of the emission spot when the two groups of directions are 0° and 180°, and 90° and 270°:

[0049] σ1=(((x1-x3) 2 +(y1-y3) 2 ) 1 / 2 ) / 2

[0050] σ2=(((x2-x4) 2 +(y2-y4) 2 ) 1 / 2 ) / 2

[0051] σ max =max(σ1,σ2);

[0052] Among them, σ1 is the Coode optical path pointing rotation error at 0° and 180°, σ2 is the Coode optical path pointing rotation error at 90° and 270°, σ max is the final Coode optical path pointing rotation error, taking the maximum value of σ1 and σ2;

[0053] 4) If the pointing rotation error of the Coode optical path meets the requirements, the magnitude of the pointing rotation error is recorded and the adjustment is completed; if the pointing rotation error of the Coode optical path does not meet the requirements, the position of the fast reflex mirror I or the position of the fast reflex mirror II or the positions of the fast reflex mirror I and the fast reflex mirror II are adjusted by traversing, including the two directions of pitch and azimuth, and the collimator camera obtains and records the emission spot position information at different fast reflex mirror positions in the four directions of 0°, 90°, 180°, and 270°;

[0054] 5) Estimate the magnitude of the Coode optical path pointing rotation error at different fast mirror positions in step 4, determine the decreasing trend of the Coode optical path pointing rotation error, and record the fast mirror position and the corresponding emission spot position when the Coode optical path pointing rotation error is the smallest, as a reference for the Coode optical path adjustment;

[0055] 6) Initialize the position of the fast mirror to the center position, adjust the Kuder mirror IV until the emission spot reaches the position of step 5, repeat steps 1 to 3, and the adjustment is completed.

[0056] The present invention also provides a typical laser communication system Kuder optical path adjustment system based on a fast reflection mirror, which is used to control the steps of implementing the above method.

[0057] In view of the shortcomings of manual control and uncertain direction during the existing Kude optical path adjustment of a typical laser communication system, the present invention proposes a Kude optical path adjustment method for a typical laser communication system based on a fast-reflecting mirror. The controllable and fast characteristics of the fast-reflecting mirror in the typical laser communication system are utilized to avoid the shortcomings of uncertain direction and low controllability caused by manual control during the existing Kude optical path adjustment, effectively improving the effect and efficiency of the Kude optical path adjustment, and can be widely used in typical laser communication systems.

[0058] It is to be understood that the present invention is described by way of embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and embodiments that can fall within the scope of the claims of this application all fall within the scope protected by the present invention.

[0059] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A typical laser communication system Kude optical path adjustment method based on a fast-reflecting mirror, characterized in that: The optical path sequence of the Couder optical path of a typical laser communication system is fast mirror II (9), PBS mirror (8), dichroic mirror (7), fast mirror I (6), λ / 4 wave plate (5), Couder mirror IV (4), Couder mirror III (3), Couder mirror II (2), Couder mirror I (1); The installation method includes the following steps: Step 1, using a reference reflector (11) to reflect the light beam emitted by the collimator (12) to the camera center position of the collimator as a reference reference position during adjustment; Step 2, the optical fiber collimator (10) emits laser light, which enters the collimator through the above optical path sequence; the camera of the collimator respectively obtains and records the position information of the emitted light spot in four directions of 0°, 90°, 180° and 270°; Step 3, based on the emission spot position information recorded in step 2, estimate the magnitude of the Coode optical path pointing rotation error; Step 4, traverse and adjust the position of the fast reflex mirror I and / or the fast reflex mirror II, and the camera of the collimator respectively obtains and records the position information of the emitted light spot in four directions of 0°, 90°, 180°, and 270° when the fast reflex mirror is in different positions; Step 5, based on the emission spot position information recorded in step 4, estimate the magnitude of the Coode optical path pointing rotation error at different fast mirror positions, determine the decreasing trend of the Coode optical path pointing rotation error, and record the position of the fast mirror I and / or the fast mirror II and the corresponding emission spot position when the Coode optical path pointing rotation error is minimum; Step 6, initialize the position of the fast mirror I and / or the fast mirror II to the center position, adjust the Kudet mirror IV (4) until the emission spot reaches the position recorded in step 5, repeat steps 1 to 3, and the adjustment is completed.

2. The Kude optical path adjustment method of a typical laser communication system based on a fast-reflection mirror according to claim 1 is characterized in that: Estimate the magnitude of the Coode optical path pointing rotation error as follows: σ1=(((x1-x3) 2 +(y1-y3) 2 ) 1 / 2 ) / 2 σ2=(((x2-x4) 2 +(y2-y4) 2 ) 1 / 2 ) / 2 s max =max(σ1,σ2); Among them, σ1 is the Coode optical path pointing rotation error at 0° and 180°, σ2 is the Coode optical path pointing rotation error at 90° and 270°, σ max is the final estimated Coode optical path pointing rotation error, taking the maximum value of σ1 and σ2; (x1, y1), (x2, y2), (x3, y3), (x4, y4) are the emission spot position information recorded by the parallel light tube camera at the four directions of 0°, 90°, 180°, and 270° respectively.

3. The Kude optical path adjustment method of a typical laser communication system based on a fast-reflection mirror according to claim 1 is characterized in that: Adjust the position of the quick-reflex mirror, including pitch and azimuth.

4. A typical laser communication system Kude optical path adjustment system based on fast mirror, characterized by: Used for adjusting the Couder optical path of a typical laser communication system, wherein the optical path sequence of the Couder optical path of the typical laser communication system is fast reflection mirror II (9), PBS mirror (8), dichroic mirror (7), fast reflection mirror I (6), λ / 4 wave plate (5), Couder mirror IV (4), Couder mirror III (3), Couder mirror II (2), and Couder mirror I (1); The installation system includes: The first module is used to control the reference reflector (11) to reflect the light beam emitted by the collimator (12) to the camera center position of the collimator as a reference reference position during installation and adjustment; The second module is used to control the optical fiber collimator (10) to emit laser light, which enters the collimator through the above optical path sequence; the camera of the collimator is controlled to respectively obtain and record the position information of the emitted light spot in the four directions of 0°, 90°, 180° and 270°; The third module is used to estimate the magnitude of the Coode optical path pointing rotation error according to the emission spot position information recorded by the second module; The fourth module is used to control the traversal adjustment of the position of the fast reflex mirror I and / or the fast reflex mirror II, and the camera of the collimator obtains and records the position information of the light spot emitted in four directions of 0°, 90°, 180° and 270° when the fast reflex mirror is in different positions; The fifth module is used to estimate the magnitude of the Coode optical path pointing rotation error at different fast mirror positions according to the emission light spot position information recorded by the fourth module, determine the decreasing trend of the Coode optical path pointing rotation error, and record the position of the fast mirror I and / or the fast mirror II and the corresponding emission light spot position when the Coode optical path pointing rotation error is the smallest; The sixth module is used to initialize the position of the fast reflex mirror I and / or the fast reflex mirror II to the center position, control the adjustment of the Kude mirror IV (4) until the emission spot reaches the position recorded by the fifth module, call the first module, the second module and the third module to complete the adjustment.

5. The Kude optical path adjustment system of a typical laser communication system based on a fast-reflection mirror according to claim 4 is characterized in that: In the third and fifth modules, the magnitude of the rotation error of the Kude optical path is estimated as follows: σ1=(((x1-x3) 2 +(y1-y3) 2 ) 1 / 2 ) / 2 σ2=(((x2-x4) 2 +(y2-y4) 2 ) 1 / 2 ) / 2 s max =max(σ1,σ2); Among them, σ1 is the Coode optical path pointing rotation error at 0° and 180°, σ2 is the Coode optical path pointing rotation error at 90° and 270°, σ max is the final estimated Coode optical path pointing rotation error, taking the maximum value of σ1 and σ2; (x1, y1), (x2, y2), (x3, y3), (x4, y4) are the emission spot position information recorded by the parallel light tube camera at the four directions of 0°, 90°, 180°, and 270° respectively.

6. The Kude optical path adjustment system of a typical laser communication system based on a fast-reflection mirror according to claim 4 is characterized by: In the fourth module, the position of the fast-reflection mirror is adjusted, including pitch and azimuth directions.

Images