A system and method for tracking axis and co-axiality testing of a sight axis

Abstract

The application discloses a system and method for tracking axis and aiming axis coaxial test, and belongs to the technical field of star-ground laser communication. The system comprises a detection and emission system, a light splitting device, a detection device and a simulation beacon light source; the detection and emission system is used for emitting two-way communication light beams, the two-way communication light beams can be imaged in the detection device and a star terminal target at the same time, and image points in the detection device are used for being conjugated with star terminal target image points; the simulation beacon light source is used for outputting a simulation beacon light beam, the simulation beacon light beam forms a reflected light beam and a transmitted light beam through the light splitting device, the reflected light beam is imaged in the detection device, the transmitted light beam is imaged in the detection and emission system, and image points in the detection and emission system are conjugated with the simulation beacon light source. Even in the case of not having a star terminal beacon light, the application can still observe and adjust the coaxiality of the tracking axis and the aiming axis, and is convenient for completing tracking and aiming calibration in advance before external communication.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of satellite-to-ground laser communication, and particularly relates to a system and method for coaxial testing of a tracking axis and an aiming axis. BACKGROUND

[0002] Satellite-to-ground laser communication has the advantages of high rate, large communication capacity and high confidentiality, and is one of the preferred schemes for future efficient and confidential communication, and has good development prospects in military defense and business, etc.

[0003] In the research of satellite-to-ground laser communication technology, the aiming accuracy of the target is one of the important parameters to ensure the establishment and maintenance of the communication link. At present, researchers have carried out a lot of research on the aiming technology of the light beam, but in actual debugging tests, there are still cases where the coaxiality of the tracking axis and the aiming axis cannot be observed and adjusted when there is no star-end beacon light; the working capacity of the system cannot be judged; and when working externally, the tracking and aiming calibration cannot be completed in advance, thereby the test and debugging cost cannot be reduced. SUMMARY

[0004] In view of the above technical problems, the application provides a system and method for coaxial testing of a tracking axis and an aiming axis, which can solve the problem that the coaxiality of the tracking axis and the aiming axis is difficult to observe and adjust when there is no star-end beacon light, and the scheme provided by the application is simple and reliable, has wide application scenarios, and has mature processing technology.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the application is as follows:

[0006] On the one hand, the application provides a system for coaxial testing of a tracking axis and an aiming axis, comprising a detection and emission system, a light splitting device, a detection device and a simulated beacon light source;

[0007] The detection and emission system is used for emitting two-way communication light beams, one of which is used for imaging in the detection device, and the other is used for simultaneously reaching the star-end target and imaging, and the image points in the detection device and the image points of the star-end target are conjugate;

[0008] The simulated beacon light source is used for outputting a simulated beacon light beam, and the simulated beacon light beam forms a reflected light beam and a transmitted light beam after passing through the light splitting device, the reflected light beam is used for imaging in the detection device, and the transmitted light beam is used for imaging in the detection and emission system, and the image points of the transmitted light beam in the detection and emission system are conjugate with the simulated beacon light source.

[0009] Further, the system further comprises a light path returning device, the analog beacon light beam forms a reflected light beam after being reflected by the light splitting device, the reflected light beam returns to the light splitting device via the light path returning device and forms an image in the detection device after being transmitted by the light splitting device; meanwhile, the analog beacon light beam forms a transmitted light beam after being transmitted by the light splitting device, the transmitted light beam forms an image in the detection and emission system.

[0010] Further, the system further comprises an imaging lens group and a reflecting device, the communication light beam emitted by the detection and emission system forms an image in the detection device after being reflected by the light splitting device, the imaging lens group and the reflecting device.

[0011] Further, the light path returning device is a corner cube.

[0012] Further, the system further comprises a standard light source for emitting a standard communication light beam, the standard communication light beam emitted by the standard light source forms an image in the detection device; and in the detection device, the position of the image point of the standard light source and the image point of the analog beacon light source are overlapped, which can complete the coaxial verification of the communication light beam imaging link and the analog beacon light beam imaging link.

[0013] Further, the system further comprises a light path collimating device, the analog beacon light beam output by the analog beacon light source forms a parallel light beam after being collimated by the light path collimating device, and the parallel light beam is emitted to the light splitting device, the parallel light beam forms a first reflected light beam after being reflected by the light splitting device, and forms a transmitted light beam after being transmitted by the light splitting device, the first reflected light beam enters the light path returning device to form a second reflected light beam, the second reflected light beam returns to the light splitting device and forms an image in the detection device; the transmitted light beam directly reaches the detection and emission system and forms an image, and the image point of the transmitted light beam in the detection and emission system can be conjugated with the analog beacon light source.

[0014] Further, the light splitting device is a light splitting mirror; and the detection device is a detection camera.

[0015] In another aspect, the application further provides a method for tracking axis and aiming axis coaxial test, which uses the system for tracking axis and aiming axis coaxial test, and comprises the following steps,

[0016] S1, determining that the communication light beam imaging link and the analog beacon light beam imaging link have no axis difference;

[0017] S2, the detection device acquires the image point of the communication light beam emitted by the detection and emission system;

[0018] S3, the detection device acquires the image point of the analog beacon light beam output by the analog beacon light source;

[0019] S4, after determining that the communication beam image point coincides with the simulated beacon beam image point, completing coaxial test of the tracking axis and the aiming axis.

[0020] Further, in step S1:

[0021] Firstly, a standard light source is used to replace the detection and emission system, and a standard communication beam is emitted by the standard light source, so that the detection device obtains the standard beam image point;

[0022] Then, the simulated beacon light source outputs a simulated beacon beam, and the detection device obtains the simulated beacon beam image point;

[0023] Finally, the standard beam image point and the simulated beacon beam image point are overlapped, and the coaxial test of the communication beam imaging link and the simulated beacon beam imaging link is completed.

[0024] Further, in step S4, the detection and emission system is debugged until the communication beam image point coincides with the simulated beacon beam image point.

[0025] The beneficial effects of the present application are:

[0026] In the present application, the communication beam emitted by the detection and emission system can be imaged in the detection device and the star-end target at the same time, and the image point in the detection device can be conjugated with the star-end target image point, so that the communication beam imaging link can simulate the aiming axis, and the image point in the detection and emission system is conjugated with the simulated beacon light source, so that the simulated beacon beam imaging link can simulate the tracking axis. By ingeniously introducing the simulated beacon beam, it is realized that in the actual debugging test, even in the case where there is no star-end beacon light, the coaxiality of the tracking axis and the aiming axis can still be observed and adjusted, which is convenient for judging the working capacity of the system. At the same time, before the system for testing the coaxiality of the tracking axis and the aiming axis provided in the present application communicates externally, it is also convenient to complete the tracking and aiming calibration in advance. The whole operation process is simple to operate, and the observation can be completed in the same image point detection device. In addition, the system for testing the coaxiality of the tracking axis and the aiming axis provided in the present application has a simple structure, no difficulty in assembly and adjustment, wide application scene, and mature processing technology. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a system for testing the coaxiality of a tracking axis and an aiming axis according to the present application;

[0028] Figure 2 It is a schematic diagram of a target surface of a detection device.

[0029] Reference signs:

[0030] 1 - detection and emission system; 2 - communication light beams; 3 - light splitting device; 4 - imaging lens group; 5 - reflecting device; 6 - detection device; 7 - simulated beacon light source; 8 - simulated beacon light beam; 9 - light path collimation device; 10 - light path returning device; 11 - star end beacon light beam; 12 - star end target. DETAILED DESCRIPTION

[0031] The application will be further described in detail in combination with test examples and specific embodiments. However, it should not be understood that the above-mentioned subject matter of the application is limited to the following examples only, and any technology realized based on the content of the application falls within the scope of the application.

[0032] As shown in the drawings, the application provides a system for coaxial test of tracking axis and aiming axis, which solves the problem that the tracking axis and the aiming axis are difficult to be coaxially observed and adjusted without star end beacon light beam by introducing simulated beacon light. Figure 1

[0033] The system includes detection and emission system 1, light splitting device 3, detection device 6, simulated beacon light source 7, light path returning device 10, imaging lens group 4, reflecting device 5, standard light source and light path collimation device 9.

[0034] When the system for coaxial test of tracking axis and aiming axis is used, the detection and emission system 1 can emit two-way communication light beams 2, one of which is sequentially reflected by the light splitting device 3, focused by the imaging lens group 4, reflected by the reflecting device 5 again, and then imaged in the detection device 6, and the other of which reaches the star end target 12; the communication light beams 2 emitted by the detection and emission system 1 can be imaged in the detection device 6 and the star end target 12 at the same time, and the image points in the detection device 6 can be conjugated with the image points of the star end target 12, so that the communication light beams 2 form an imaging link simulating the aiming axis.

[0035] When the system for coaxial test of tracking axis and aiming axis is used, the simulated beacon light source 7 outputs simulated beacon light beam 8, which becomes parallel light beam after collimation by the light path collimation device 9, and the parallel light beam forms first reflected light beam after reflection by the light splitting device 3, and forms transmission light beam after passing through the light splitting device 3. Among them, the first reflected light beam enters the light path returning device 10, which always returns light beams parallel to the incident light, i.e. second reflected light beam, which is returned to the light splitting device 3, and sequentially reflected by the light splitting device 3, focused by the imaging lens group 4, reflected by the reflecting device 5 again, and then imaged in the detection device 6; the transmission light beam directly reaches the detection and emission system 1 and is imaged, and the image points in the detection and emission system 1 can be conjugated with the simulated beacon light source 7, so that the simulated beacon light beam 8 forms an imaging link simulating the tracking axis.

[0036] ​The application realizes that even in the actual debugging test without the star-end beacon light beam 11, the coaxiality of the tracking axis and the aiming axis can still be observed and adjusted, which is convenient for judging the system working capacity. Meanwhile, before the system for testing the coaxiality of the tracking axis and the aiming axis communicates externally, the tracking and aiming calibration can be completed in advance. The whole operation process is simple, and the observation can be completed in the same image point detection device 6. In addition, the system for testing the coaxiality of the tracking axis and the aiming axis has simple structure, no adjustment difficulty, wide application scene and mature processing technology.

[0037] Preferably, the light splitting device 3 can be a light splitting mirror, the reflecting device 5 can be a reflecting mirror, the detection device 6 can be a detection camera, and the light path collimation device 9 can be a standard collimation mirror group.

[0038] The light path collimation device 9 is arranged between the simulation beacon light source 7 and the light splitting device 3, so that the simulation beacon light beam 8 output by the simulation beacon light source 7 can form a parallel light beam after collimation by the light path collimation device 9, thereby improving the reliability of the coaxiality test of the tracking axis and the aiming axis.

[0039] It should be understood that the communication light beam 2 imaging link and the simulation beacon light beam 8 imaging link share the same light splitting device 3, and the imaging mirror group 4 and the reflecting device 5 are arranged between the detection device 6 and the light splitting device 3, so as to shorten the light path layout and save space.

[0040] The light path returning device 10 is selected so that the simulation beacon light beam 8 output by the simulation beacon light source 7 can be imaged in the detection device 6; and the communication light beam 2 imaging link and the simulation beacon light beam 8 imaging link not only share the same light splitting device 3, but also share the same detection device 6. Therefore, the application selects that the second reflected light beam can return along the original path, so that the second reflected light beam can be imaged in the detection device 6 after being transmitted by the light splitting device 3, focused by the imaging mirror group 4, and reflected by the reflecting device 5 again. It should be noted that the application is ingenious in shortening the light path layout and saving space by arranging the light path returning device 10 so that the communication light beam 2 imaging link and the simulation beacon light beam 8 imaging link have a sharing condition. The transmission link of the simulation beacon light beam 8 includes two links, one of which is imaged by the transmitted light in the detection and transmission system 1, and the other of which is imaged by the reflected light beam in the detection device 6 through the light splitting device 3; and the communication light beam 2 imaging link is imaged in the detection device 6 by the communication light beam 2 through the light splitting device 3. One of the simulation beacon light beam 8 imaging link transmission beams has completely coincided with the communication light beam 2 imaging link, thereby greatly optimizing the simulation beacon light beam 8 imaging link, and enabling the system for testing the coaxiality of the tracking axis and the aiming axis to greatly simplify the structure layout and save space.

[0041] Further, the light path returning device 10 is a corner cube. The incident light and the emergent light of the corner cube are parallel, so that the reflected light beam can return along the original path. However, if the common mirror is not completely zero-degree incident, the light beam or the mirror surface has a certain deflection, the incident light and the emergent light have a certain angle, and thus the reflected light beam cannot return along the original path. Therefore, in actual use, it is difficult to ensure complete zero-degree.

[0042] The standard light source is used to verify the communication light beam 2 imaging link and the simulated beacon light beam 8 imaging link without axis difference before the coaxial test of the tracking axis and the aiming axis, so as to ensure the effectiveness and reliability of the coaxial test of the tracking axis and the aiming axis.

[0043] Specifically, when verifying the communication light beam 2 imaging link and the simulated beacon light beam 8 imaging link without axis difference:

[0044] First, the standard light source is used to replace the detection and emission system 1, and the standard light beam is emitted by the standard light source, so that the detection device 6 obtains the standard light beam image point. Specifically, after the standard light source is used to replace the detection and emission system 1, the standard light source emits a standard communication light beam 2 of the same wavelength and parallel to the communication light beam 2 emitted by the detection and emission system 1. The standard communication light beam 2 is sequentially reflected by the light splitting device 3, focused by the imaging lens group 4, reflected by the reflecting device 5 again, and then imaged in the detection device 6. As shown in FIG. 2, at this time, the standard light source image point exists in the target surface of the detection device 6. The light splitting device 3, the imaging lens group 4, the reflecting device 5, and the detection device 6 can be adjusted so that the standard light source image point is in the middle position of the target surface of the detection device 6, and the communication light beam 2 imaging link is ensured to be adjusted. Figure 2

[0045] Then, the simulated beacon light source 7 outputs the simulated beacon light beam 8, and the detection device 6 obtains the simulated beacon light beam 8 image point. Specifically, the simulated beacon light source 7 is turned on and outputs the simulated beacon light beam 8. The simulated beacon light beam 8 becomes a parallel light beam after being collimated by the light path collimation device 9. The parallel light beam is reflected by the light splitting device 3 to form a reflected light beam. The reflected light beam enters the light path returning device 10, and the light path returning device 10 can always return a parallel light beam with the incident light. The second reflected light beam returns along the original path, and is sequentially transmitted by the light splitting device 3, focused by the imaging lens group 4, reflected by the reflecting device 5 again, and then imaged in the detection device 6. At this time, the standard light source image point and the simulated beacon light beam 8 image point exist in the target surface of the detection device 6.

[0046] ​Finally, the standard light beam image point and the simulated beacon light beam 8 image point are overlapped to complete the coaxiality verification of the communication light beam 2 imaging link and the simulated beacon light beam 8 imaging link. Specifically, the simulated beacon light source 7, the optical path collimation device 9, and the optical path return device 10 can be adjusted to make the standard light source image point and the simulated beacon light beam 8 image point overlap, so as to complete the coaxiality verification of the communication light beam 2 imaging link and the simulated beacon light beam 8 imaging link.

[0047] The standard communication light beam 2 emitted by the standard light source can be imaged in the detection device 6. In the detection device 6, the position of the standard light source image point and the simulated beacon light source 7 image point is overlapped, so as to complete the coaxiality verification of the communication light beam 2 imaging link and the simulated beacon light beam 8 imaging link.

[0048] On the other hand, the present application provides a method for tracking axis and aiming axis coaxiality test, which uses the aforementioned system for tracking axis and aiming axis coaxiality test, and introduces a simulated beacon light to solve the problem that the tracking axis and the aiming axis are difficult to be coaxially observed and adjusted when there is no star-end beacon light beam. Specifically, the method comprises the following steps:

[0049] S1, determining the coaxiality of the communication light beam 2 imaging link and the simulated beacon light beam 8 imaging link, that is, completing the coaxiality verification of the communication light beam 2 imaging link and the simulated beacon light beam 8 imaging link; comprising:

[0050] Firstly, the detection and emission system 1 is replaced by the standard light source, and the standard light beam is emitted by the standard light source, so that the detection device 6 obtains the standard light beam image point.

[0051] Specifically, after the detection and emission system 1 is replaced by the standard light source, the standard light source emits a standard communication light beam which is parallel to the communication light beam 2 emitted by the detection and emission system 1 and has the same wavelength. The standard communication light beam is reflected by the light splitting device 3, focused by the imaging lens group 4, reflected by the reflecting device 5 again, and then imaged in the detection device 6. At this time, the standard light source image point exists in the target surface of the detection device 6. The standard light source image point can be adjusted to be in the middle position of the target surface of the detection device 6 by adjusting the light splitting device 3, the imaging lens group 4, the reflecting device 5, and the detection device 6, so as to ensure that the imaging link of the communication light beam 2 is adjusted.

[0052] Then, the simulated beacon light source 7 outputs the simulated beacon light beam 8, and the detection device 6 obtains the simulated beacon light beam 8 image point.

[0053] Specifically, the analog beacon light source 7 is turned on and outputs the analog beacon light beam 8, which is collimated into a parallel light beam by the light path collimation device 9. The parallel light beam is reflected by the light splitting device 3 to form a reflected light beam. The reflected light beam enters the light path returning device 10, which can always return the parallel light beam incident thereto to return the reflected light beam to the original path. The reflected light beam is transmitted by the light splitting device 3, focused by the imaging lens group 4, reflected by the reflecting device 5 again, and then imaged in the detection device 6. At this time, the standard light source image point and the analog beacon light beam 8 image point exist in the target surface of the detection device 6 at the same time.

[0054] Finally, the standard light beam image point and the analog beacon light beam 8 image point are superimposed to complete the non-axial difference verification of the communication light beam 2 imaging link and the analog beacon light beam 8 imaging link.

[0055] Specifically, the standard light source image point and the analog beacon light beam 8 image point can be superimposed by adjusting the analog beacon light source 7, the light path collimation device 9, and the light path returning device 10 to complete the non-axial difference verification of the communication light beam 2 imaging link and the analog beacon light beam 8 imaging link.

[0056] S2, the detection device 6 acquires the image point of the communication light beam 2 emitted by the detection and emission system 1.

[0057] After the non-axial difference verification of the communication light beam 2 imaging link and the analog beacon light beam 8 imaging link is completed, the standard light source is replaced by the detection and emission system 1, and the communication light beam 2 emitted by the detection and emission system 1 is imaged in the detection device 6 after being reflected by the light splitting device 3, focused by the imaging lens group 4, and reflected by the reflecting device 5 again. Since the detection and emission system 1 can emit two communication light beams 2, one of which is imaged in the detection device 6, and the other of which can reach the star end target 12, the communication light beam 2 emitted by the detection and emission system 1 can be imaged in the detection device 6 and the star end target 12 at the same time, and the image point in the detection device 6 can be conjugated with the image point of the star end target 12, so that the communication light beam 2 imaging link can be simulated to aim at the axis.

[0058] S3, the detection device 6 acquires the image point of the analog beacon light beam 8 output by the analog beacon light source 7.

[0059] The simulation beacon light source 7 is turned on and outputs a simulation beacon light beam 8, which is collimated into a parallel light beam by the light path collimation device 9, and the parallel light beam is reflected by the light splitting device 3 to form a reflected light beam. The reflected light beam enters the light path returning device 10, and the light path returning device 10 can always return parallel light beams with incident light to return the reflected light beam to the original path, and the reflected light beam is sequentially transmitted by the light splitting device 3, focused by the imaging lens group 4, reflected by the reflecting device 5 again, and then imaged in the detection device 6. Since the simulation beacon light beam 8 output by the simulation beacon light source 7 is reflected by the light splitting device 3 to form a reflected light beam and a transmitted light beam, the reflected light beam is imaged in the detection device 6, and the transmitted light beam is used to image in the detection and emission system 1, and the image point in the detection and emission system 1 can be conjugated with the simulation beacon light source 7, so that the imaging link of the simulation beacon light beam 8 can simulate the tracking axis.

[0060] S4, after determining that the image point of the communication light beam 2 coincides with the image point of the simulation beacon light beam 8, the coaxial test of the tracking axis and the aiming axis is completed.

[0061] At this time, the image points of the communication light beam 2 and the simulation beacon light beam 8 exist on the target surface of the detection device 6 at the same time, when the two image points coincide, the simulation beacon light beam 8 is coaxial with the communication light beam 2, that is, the tracking axis is coaxial with the aiming axis. When the two image points do not coincide, there is an aiming error, and the detection and emission system 1 needs to be adjusted until the image points of the communication light beam 2 and the simulation beacon light beam 8 coincide, and after confirming the coaxiality of the tracking and aiming, external communication can be carried out.

[0062] The above-described specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above-described specific embodiments are only specific embodiments of the present application and are not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A system for tracking axis and boresight coaxiality testing, characterized by, The system comprises a detection and emission system, a light splitting device, a detection device and a simulation beacon light source. The detection and emission system is used to emit two communication beams, one of which is used to image in the detection device, and the other is used to reach the star target and image at the same time, and the image points in the detection device and the star target are conjugate. The simulation beacon light source is used to output a simulation beacon beam, which forms a reflected beam and a transmitted beam after passing through the light splitting device, the reflected beam is used to image in the detection device, and the transmitted beam is used to image in the detection and emission system, and the image points of the transmitted beam in the detection and emission system are conjugate with the simulation beacon light source. The system further comprises a light path returning device, the simulation beacon beam forms the reflected beam after being reflected by the light splitting device, the reflected beam returns to the original path after being affected by the light path returning device and images in the detection device after passing through the light splitting device; wherein the light path returning device always returns the light beam parallel to the incident light; The system further comprises an imaging lens group and a reflecting device, one of the communication beams emitted by the detection and emission system is reflected by the light splitting device, and then sequentially passes through the imaging lens group and the reflecting device to image in the detection device.

2. The system for tracking axis and collimation axis coaxiality testing of claim 1, wherein, The light path returning device is a corner cube prism.

3. The system for tracking axis and collimation axis coaxiality testing of any of claims 1-2, wherein, The system further comprises a standard light source for emitting a standard communication beam, the standard communication beam emitted by the standard light source images in the detection device; and in the detection device, the positions of the image points of the standard light source and the simulation beacon light source are overlapped, and the coaxial verification of the communication beam imaging link and the simulation beacon beam imaging link is completed.

4. The system for tracking axis and collimation axis coaxiality testing of claim 1, wherein, The system further comprises a light path collimating device, the simulation beacon beam output by the simulation beacon light source is collimated by the light path collimating device to form a parallel light beam, which is directed to the light splitting device, the parallel light beam forms a first reflected beam after being reflected by the light splitting device, and forms a transmitted beam after being transmitted by the light splitting device, the first reflected beam enters the light path returning device to return a second reflected beam, the second reflected beam returns to the light splitting device and images in the detection device; the transmitted beam directly reaches the detection and emission system and images, and the image points of the transmitted beam in the detection and emission system can be conjugate with the simulation beacon light source.

5. The system for tracking axis and collimation axis coaxiality testing of claim 1, wherein, The light splitting device is a light splitting mirror; the detection device is a detection camera.

6. A method for tracking axis and boresight coaxial testing, characterized by, The system for tracking axis and aiming axis coaxial test of any one of claims 1-5 comprises the following steps: S1, determining that the communication beam imaging link and the simulation beacon beam imaging link have no axis difference; S2, the detection device acquires the communication beam image points emitted by the detection and emission system; S3, the detection device acquires the simulation beacon beam image points output by the simulation beacon light source; S4, after determining that the communication beam image points and the simulation beacon beam image points coincide, the coaxial test of the tracking axis and the aiming axis is completed.

7. The method for tracking axis and collimation axis coaxiality testing of claim 6, wherein, In step S1: First, replace the detection and emission system with a standard light source, and emit a standard communication beam from the standard light source, so that the detection device acquires the image points of the standard light source; Then, the simulation beacon light source outputs a simulation beacon light beam, and the detection device acquires a simulation beacon light beam image point; Finally, the standard light source image point and the simulation beacon light beam image point are overlapped, and the communication light beam imaging link and the simulation beacon light beam imaging link are verified without axis difference.

8. The method for tracking axis and collimation axis coaxiality testing of claim 6 or 7, wherein, In step S4, the detection and emission system is debugged until the communication light beam image point and the simulation beacon light beam image point are overlapped.

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