Multi-optical-axis online compensation alignment system and method for space environment simulation system

Abstract

The present invention discloses a multi-optical axis on-line compensation alignment system and method for a space environment simulation system, which relates to the field of space optoelectronic tracking and pointing. The key technical solutions include a TSSOC system, a pentaprism, a stray light simulation system, and a second reflector. The TSSOC system is used to send simulated light simulating an observed object to a camera to be measured. The pentaprism is used to determine the intersection of the optical axes of the TSSOC system and the stray light simulation system for placing the camera to be measured. A beacon light source is built in the TSSOC system. The beacon light emitted by the beacon light source is divided into two beams. One beam is always inside the TSSOC system to form a reference light spot in the signal camera, and the other beam passes through the second reflector on the camera to be measured to form a second beacon light spot in the signal camera. In the scenario where the incident angle of stray light changes dynamically, by dynamically adjusting the TSSOC system to keep the reference light spot and the second beacon light spot coincident, the position of the camera to be measured relative to the simulated light can be dynamically compensated.

Description

Technical Field

[0001] The present invention relates to the field of space optoelectronic tracking and pointing, and more specifically, to a multi-optical axis on-line compensation and alignment system and method for a space environment simulation system. Background Art

[0002] Space remote sensing cameras usually work in a harsh environment where there are strong radiation sources (such as the sun, moon, and earth, etc.) outside the system field of view, and the target signals that the space remote sensing cameras need to detect are often very weak. The stray light radiation brought by these strong radiation sources is often several orders of magnitude higher than the radiation intensity of the detection target. When these stray lights enter the space remote sensing camera, after reflection on the surface of the optical elements in the camera and scattering and diffraction on the surface of mechanical components, etc., non-imaging light rays are formed. These non-imaging light rays are equivalent to the "noise" of the optical system. After reaching the surface of the space remote sensing camera and forming stray radiation, it will reduce the contrast, clarity, and modulation transfer function of the image, not only affecting the color restoration of the image, but also sometimes generating large or small light spots on the image plane. In severe cases, the target image will be submerged by the stray radiation noise.

[0003] Before spacecraft and its subsystems and components are put into operation, various ground space environment simulation tests can fully expose defects, reduce or avoid failures or malfunctions of the spacecraft and its subsystems in orbit, and improve their on-orbit working reliability. In the publicly available research, traditional ground space environment simulation tests do not consider the pixel drift of the simulated target caused by environmental vibration factors such as the ground and turntables.

[0004] Considering that space missions require the vehicle and its subsystems to meet the specified directivity, such as navigation and positioning missions, the vibration interference factors will greatly affect the ground calibration effect of the device under test and reduce its actual use performance. Only by ensuring the correct attitude and azimuth between the subsystem axes in the ground simulation test can the authenticity of the ground space environment simulation and the test measurement accuracy be ensured, and the test effectiveness be improved.

[0005] Therefore, it is necessary to provide a multi-optical axis on-line compensation and alignment system and method for a space environment simulation system to improve the dynamic optical axis alignment accuracy between the simulated target and the space camera. Summary of the Invention

[0006] The present invention provides a multi-optical axis on-line compensation alignment system for a space environment simulation system, which includes a TSSOC system, a pentaprism, a stray light simulation system, a first optical adjustment platform, a second optical adjustment platform and a second mirror. The TSSOC system includes a simulation light source, an LCOS display, a PBS, a first NPBS, a collimation module, a beacon light source, a first collimator, a first mirror and a signal camera. The collimation module is internally provided with an improved Petzval lens, which is formed by gluing a meniscus lens with a negative optical power at a position close to the pentaprism or the camera to be measured in the basic structure of the Petzval lens. The relative positions of all components in the TSSOC system are fixed. The first optical adjustment platform is used to adjust the horizontal deflection angle and pitch angle of the TSSOC system. The first optical adjustment platform is located on the second optical adjustment platform.

[0007] The pentaprism is used to deflect the incident light by 90°. The two surfaces for the incident and outgoing light of the pentaprism are the first working surface and the second working surface, and a semi-transparent and semi-reflective film is coated on the second working surface. The second mirror is installed on the camera to be measured and adjacent to the light inlet of the camera to be measured. The second mirror is perpendicular to the optical axis of the light inlet of the camera to be measured.

[0008] The second optical adjustment platform is used to adjust the horizontal deflection angle and pitch angle of the first optical adjustment platform, the pentaprism and the camera to be measured. The pentaprism and the camera to be measured do not exist on the second optical adjustment platform at the same time. The pentaprism is first placed on the second optical adjustment platform. When the optical axis of the collimation module is perpendicular to the first working surface and the outgoing optical axis of the stray light simulation system is perpendicular to the second working surface, the pentaprism is replaced with the camera to be measured. The second mirror is used to reflect the light from the collimation module.

[0009] The splitting surfaces of the PBS and the first NPBS are parallel to each other. The PBS, the first collimator, the collimation module and the signal camera are sequentially distributed around the four directions of the first NPBS. The LCOS display, the simulation light source, the first NPBS and the beacon light source are sequentially distributed around the four directions of the PBS. The first collimator is located between the first NPBS and the first mirror.

[0010] The simulation light source is used to emit simulation light to the PBS. The beacon light source is used to emit beacon light to the PBS. The LCOS display is used to reflect the light from the PBS back to the PBS. The first collimator is used to vertically emit the light from the first NPBS to the first mirror. The first mirror is used to reflect the light from the first collimator back to the first collimator along the original path. The signal camera is used to receive the light from the first NPBS. The collimation module is used to collimate the light from the first NPBS, the light incident on the first NPBS from the first working surface and the light incident on the first NPBS from the second mirror.

[0011] The present invention is further configured such that: a reticle is built in the collimation module, and cross hairs are provided on the reticle.

[0012] The present invention is further configured such that: it further includes a beacon collimator, and the beacon light emitted by the beacon light source is directed to the PBS through the beacon collimator.

[0013] The present invention is further configured such that: the stray light simulation system includes a stray light source, a first reticle, a second reticle, an alignment light source, a second NPBS, and a second collimating mirror.

[0014] The first reticle and the second reticle are respectively located on the adjacent sides of the second NPBS, and the first reticle and the second reticle are respectively located on both sides of the beam splitting surface of the second NPBS. The light emitted by the alignment light source passes through the second reticle and then is directed to the second NPBS. The second collimating mirror is used to collimate the light from the second NPBS and the light incident on the second NPBS from the second working surface. Cross hairs are provided on both the first reticle and the second reticle. The alignment light source is used to form an image of the cross hairs of the second reticle. After the image of the cross hairs of the second reticle passes through the second NPBS, the second collimating mirror, and the second working surface in sequence, it returns along the original path and is projected onto the first reticle.

[0015] The stray light source enters the first reticle, the second NPBS, and the second collimating mirror in sequence and then exits.

[0016] The present invention is further configured such that: two second reticles are provided. The light emitted by the alignment light source passes through the two second reticles and then is directed to the second NPBS. The cross hairs on the two second reticles are aligned, and only the image of the cross hairs of one second reticle is on the first reticle.

[0017] The present invention is further configured such that: the stray light simulation system further includes a microscopic module, and the microscopic module is arranged on the side of the first reticle away from the second NPBS, and the microscopic module is used to observe the first reticle.

[0018] The present invention is further configured such that: the stray light simulation system further includes a third reflecting mirror. The light from the second NPBS is directed to the second collimating mirror through the third reflecting mirror, and the light from the second collimating mirror is directed to the second NPBS through the third reflecting mirror.

[0019] The present invention is further configured such that: the light emitted from the second collimating mirror is perpendicular to the second reticle.

[0020] The present invention also provides a multi-optical axis online compensation alignment method for a space environment simulation system, which uses the above-mentioned multi-optical axis online compensation alignment system for a space environment simulation system. The specific steps include: S1. Taking the outgoing optical axis of the stray light simulation system as the reference optical axis, adjusting the pentaprism through the second optical adjustment platform to make the second working surface perpendicular to the reference optical axis.

[0021] S2. Turn off the simulated light source and turn on the beacon light source. The light emitted by the beacon light source is reflected by the PBS and then divided into two optical paths at the beam splitting surface of the first NPBS. One optical path is reflected back to the first NPBS by the first collimator after passing through the first reflector, and then passes through the first NPBS and is received by the signal camera to form a reference light spot. The other optical path passes through the first NPBS, is directed towards the first working surface through the collimation module, is reflected by the semi-transparent and semi-reflective film in the pentaprism, returns along the original path to the first NPBS, and then is reflected by the beam splitting surface of the first NPBS and is received by the signal camera to form the first beacon light spot. Adjust the TSSOC system through the first optical adjustment platform to make the reference light spot coincide with the first beacon light spot. The optical axis of the outgoing light of the TSSOC system when the reference light spot coincides with the first beacon light spot is the vertical optical axis.

[0022] S3. Place the camera under test on the second optical adjustment platform so that the intersection of the vertical optical axis and the reference optical axis is directly in front of the light inlet of the camera under test, and remove the pentaprism from the second optical adjustment platform. The light emitted by the beacon light source is reflected by the PBS and then divided into two optical paths at the beam splitting surface of the first NPBS. One optical path forms a reference light spot, and the other optical path passes through the first NPBS, is directed towards the second reflector through the collimation module, is reflected back to the first NPBS under the reflection of the second reflector, and then is reflected by the beam splitting surface of the first NPBS and is received by the signal camera to form the second beacon light spot. Adjust the position of the camera under test on the second optical adjustment platform to make the reference light spot coincide with the second beacon light spot.

[0023] S4. Turn on the simulated light source to simulate the observed object. Adjust the horizontal deflection angle of the second optical adjustment platform to simulate the change in the incident angle of stray light in the usage scenario of the camera under test. When the horizontal deflection angle of the second optical adjustment platform changes, dynamically adjust the horizontal deflection angle, pitch angle of the first optical adjustment platform and its position on the table surface of the second optical adjustment platform to keep the reference light spot in a state of coincidence with the second beacon light spot.

[0024] The present invention is further configured as follows: S2 further includes that the light from the first NPBS is directed towards the reticle in the collimation module to form a crosshair image. The crosshair image is reflected back along the original path after passing through the pentaprism and is directed towards the first NPBS, and then is reflected by the beam splitting surface of the first NPBS and is received by the signal camera. By adjusting the horizontal deflection angle, pitch angle of the first optical adjustment platform and its position on the table surface of the second optical adjustment platform, the first beacon light spot is located at the center of the crosshair image received by the signal camera.

[0025] In summary, the present invention has the following beneficial effects compared with the prior art: The present invention proposes a multi-optical axis on-line compensation alignment system for a space environment simulation system. The TSSOC system in it is used to send the simulated light simulating the observed object to the camera to be measured. The TSSOC system is built-in with a beacon light source. The beacon light emitted by the beacon light source is divided into two beams. One beam is always inside the TSSOC system and forms a reference light spot in the signal camera. The other beam passes through the second reflector on the camera to be measured and forms a second beacon light spot in the signal camera. In the scenario where the incident angle of stray light changes dynamically, by dynamically adjusting the position, horizontal offset angle and pitch angle of the TSSOC system, the reference light spot and the second beacon light spot are always kept coincident, and the position of the camera to be measured relative to the simulated light can be dynamically compensated based on the scenario where the incident angle of stray light changes dynamically, and finally the dynamic alignment between the camera to be measured and the observed object is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the multi-optical axis on-line compensation alignment system for the space environment simulation system in the embodiment.

[0027] In the figure: 11, simulated light source; 12, LCOS display; 13, PBS; 14, first NPBS; 15, collimation module; 16, beacon light source; 17, first collimating mirror; 18, first reflector; 19, signal camera; 110, beacon collimator; 21, pentaprism; 211, first working surface; 212, semi-transparent and semi-reflective film; 22, camera to be measured; 221, light inlet; 23, second reflector; 3, first optical adjustment platform; 4, second optical adjustment platform; 5, stray light simulation system; 51, stray light source; 52, first reticle; 53, second reticle; 54, alignment light source; 55, second NPBS; 56, second collimating mirror; 57, microscopic module; 58, third reflector; 59, observation screen; 591, through hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The technical solutions of the present invention will be clearly described below in conjunction with the description of the drawings. Obviously, the described embodiments are not all the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the invention.

[0029] It should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "horizontal", "left", "right", "front", "rear", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0030] Term Explanation

[0031] "TSSOC system", the full English name is Target simulation system for online compensation, and the Chinese interpretation is the online alignment target simulation system.

[0032] "LCOS display", the full English name is Liquid Crystal on Silicon, which is a reflective display that organically combines LCD and CMOS integrated circuits.

[0033] "PBS" is a broadband polarization beam splitter prism, which is an optical element that is formed by coating a multilayer interference film on the inclined surface of a right-angle prism and then cementing it into a cube structure, allowing the incident P-polarization component to pass through and reflecting the S-polarization component.

[0034] "NPBS" is a broadband depolarizing beam splitter prism, which is an optical element that is formed by coating a multilayer interference film on the inclined surface of a right-angle prism and then cementing it into a cube structure, so that the P-polarization component and S-polarization component of the incident light have similar beam splitting characteristics.

[0035] The "basic structure of Petzval lens" consists of two positive lenses separated by air, and the air gap is half the focal length of the lens.

[0036] "Half-transmissive and half-reflective film" is a film that takes into account both light transmittance and reflectivity.

[0037] Embodiment

[0038] As Figure 1 shown, it is a multi-optical axis online compensation alignment system for a space environment simulation system in a preferred embodiment of the present invention. The multi-optical axis online compensation alignment system for a space environment simulation system in this embodiment includes a TSSOC system, a pentaprism 21, a stray light simulation system 5, a first optical adjustment platform 3, a second optical adjustment platform 4, and a second mirror 23. The TSSOC system includes a simulation light source 11, an LCOS display 12, a PBS 13, a first NPBS 14, a collimation module 15, a beacon light source 16, a first collimating mirror 17, a first mirror 18, and a signal camera 19. The collimation module 15 is internally provided with an improved Petzval lens, and the improved Petzval lens is a lens formed by cementing a meniscus lens with a negative optical power at a position close to the pentaprism 21 or the camera to be measured 22 in the basic structure of the Petzval lens. The relative positions of all components in the TSSOC system are fixed, and the first optical adjustment platform 3 is used to adjust the horizontal deflection angle and pitch angle of the TSSOC system. The first optical adjustment platform 3 is located on the second optical adjustment platform 4.

[0039] The cemented layer added to the improved Petzval lens on the basis of the basic structure of the Petzval lens can eliminate chromatic aberration. At the same time, the cemented layer can also optimize the spherical radius of the rear lens group in the basic structure of the Petzval lens to balance the spherical aberration and coma of the entire lens. On this basis, the negative meniscus lens and the cemented layer can increase the back focal length of the lens to increase the distance between the LCOS display 12 and the improved Petzval lens, so as to meet the placement requirements of the PBS 13 and the first NPBS 14.

[0040] The pentaprism 21 is used to deflect the incident light by 90°. The two surfaces of the pentaprism 21 for incoming and outgoing light are the first working surface 211 and the second working surface, and a semi-transmissive and semi-reflective film 212 is plated on the second working surface. The second mirror 23 is installed on the camera under test 22 and adjacent to the light inlet 221 of the camera under test 22, and the second mirror 23 is perpendicular to the optical axis of the light inlet 221 of the camera under test 22.

[0041] The second optical adjustment platform 4 is used to adjust the horizontal deflection angle and pitch angle of the first optical adjustment platform 3, the pentaprism 21 and the camera under test 22. The pentaprism 21 and the camera under test 22 do not exist on the second optical adjustment platform 4 at the same time. The pentaprism 21 is first placed on the second optical adjustment platform 4. When the optical axis of the collimation module 15 is perpendicular to the first working surface 211 and the outgoing optical axis of the stray light simulation system 5 is perpendicular to the second working surface, the pentaprism 21 is replaced with the camera under test 22, and the second mirror 23 is used to reflect the light from the collimation module 15.

[0042] The beam splitting surfaces of the PBS 13 and the first NPBS 14 are parallel to each other. The PBS 13, the first collimator 17, the collimation module 15 and the signal camera 19 are sequentially distributed around the first NPBS 14 in four directions. The LCOS display 12, the simulation light source 11, the first NPBS 14 and the beacon light source 16 are sequentially distributed around the PBS 13 in four directions. The first collimator 17 is located between the first NPBS 14 and the first mirror 18.

[0043] The simulation light source 11 is used to emit simulation light to the PBS 13, the beacon light source 16 is used to emit beacon light to the PBS 13, the LCOS display 12 is used to reflect the light from the PBS 13 back to the PBS 13, the first collimator 17 is used to vertically project the light from the first NPBS 14 onto the first mirror 18, the first mirror 18 is used to reflect the light from the first collimator 17 back to the first collimator 17 along the original path, the signal camera 19 is used to receive the light from the first NPBS 14, and the collimation module 15 is used to collimate the light from the first NPBS 14, the light incident on the first NPBS 14 from the first working surface 211 and the light incident on the first NPBS 14 from the second mirror 23.

[0044] Specifically, a reticle is built in the collimation module 15, and cross hairs are provided on the reticle.

[0045] This embodiment further includes a beacon collimator 110. The beacon light emitted by the beacon light source 16 is directed towards the PBS 13 through the beacon collimator 110. The beacon collimator 110 is used to reduce the divergence angle of the beacon light and reduce the loss of the beacon light before reaching the PBS 13.

[0046] Specifically, the stray light simulation system 5 includes a stray light source 51, a first reticle 52, a second reticle 53, an alignment light source 54, a second NPBS 55, and a second collimating mirror 56.

[0047] The first reticle 52 and the second reticle 53 are respectively located on adjacent sides of the second NPBS 55, and the first reticle 52 and the second reticle 53 are respectively located on both sides of the beam splitting surface of the second NPBS 55. The light emitted by the alignment light source 54 passes through the second reticle 53 and then is directed towards the second NPBS 55. The second collimating mirror 56 is used to collimate the light from the second NPBS 55 and the light incident on the second NPBS 55 from the second working surface. Cross hairs are provided on both the first reticle 52 and the second reticle 53. The alignment light source 54 is used to form an image of the cross hairs of the second reticle 53. After the image of the cross hairs of the second reticle 53 passes through the second NPBS 55, the second collimating mirror 56, and the second working surface in sequence, it returns along the original path and is projected onto the first reticle 52.

[0048] The stray light source 51 enters the first reticle 52, the second NPBS 55, and the second collimating mirror 56 in sequence and then exits.

[0049] When the stray light simulation system 5 is in use, it is necessary to first turn off the stray light source 51, turn on the alignment light source 54, and adjust the position and angle of the pentaprism 21 until the image of the cross hairs of the second reticle 53 coincides with the cross hairs of the first reticle 52 to complete the optical path alignment inside the stray light simulation system 5. After the optical path inside the stray light simulation system 5 is aligned, the alignment light source 54 can be turned off and the stray light source 51 can be turned on. At this time, the light emitted by the stray light source 51 exits from the second collimating mirror 56 to simulate the stray light in the usage scenario of the camera 22 to be measured.

[0050] Specifically, two second reticles 53 are provided. The light emitted by the alignment light source 54 passes through the two second reticles 53 and then is directed towards the second NPBS 55. The cross hairs on the two second reticles 53 are aligned, and only the image of the cross hairs of one second reticle 53 is on the first reticle 52. The provision of the two second reticles 53 can improve the accuracy of the image of the cross hairs of the second reticle 53, and further improve the optical path alignment accuracy inside the stray light simulation system 5.

[0051] Specifically, the stray light simulation system 5 further includes a microscope module 57, which is arranged on the side of the first reticle 52 away from the second NPBS 55. Through the microscope module 57, the naked eye can more clearly observe the details on the first reticle 52, thereby further improving the optical path alignment accuracy inside the stray light simulation system 5. When the crosshair image of the second reticle 53 coincides with the crosshair of the first reticle 52, that is, after the optical path inside the stray light simulation system 5 is aligned, the stray light source 51 is turned on.

[0052] Specifically, the stray light simulation system 5 further includes an observation screen 59, on which a through hole 591 is opened. The through hole 591 is aligned with the crosshair on the first reticle 52. The through hole 591 ensures that there is only one ray inside the stray light simulation system 5 after the alignment light source 54 is turned off, ensuring the accuracy and repeatability of the experiment.

[0053] Specifically, the stray light simulation system 5 further includes a third reflector 58. The light from the second NPBS 55 is directed to the second collimator 56 through the third reflector 58, and the light from the second collimator 56 is directed to the second NPBS 55 through the third reflector 58. The third reflector 58 changes the optical path inside the stray light simulation system 5, which helps to make full use of the space near the second optical adjustment platform 4, improves the site adaptability of the multi-axis on-line compensation alignment system, and reduces the possibility that the multi-axis on-line compensation alignment system cannot be installed due to site limitations.

[0054] In this embodiment, the light emitted by the second collimator 56 is perpendicular to the second reticle 53, so that the light emitted by the second NPBS 55 approaches the light emitted by the parallel collimation module 15, greatly reducing the space occupied by the multi-axis on-line compensation alignment system.

[0055] This embodiment also provides a multi-axis on-line compensation alignment method for a space environment simulation system, which uses the above multi-axis on-line compensation alignment system for a space environment simulation system. The specific steps include:

[0056] S1. Align the optical path inside the stray light simulation system 5. After the alignment is completed, taking the outgoing optical axis of the stray light simulation system 5 as the reference optical axis, adjust the pentaprism 21 through the second optical adjustment platform 4 to make the second working surface perpendicular to the reference optical axis, and determine the initial position of the second optical adjustment platform 4.

[0057] S2. The simulated light source 11 is turned off and the beacon light source 16 is turned on. The light emitted by the beacon light source 16 is reflected by the PBS 13 and then divided into two optical paths at the beam splitting surface of the first NPBS 14. One optical path passes through the first collimator 17 and is reflected back to the first NPBS 14 by the first reflector 18, and then transmits through the first NPBS 14 and is received by the signal camera 19 to form a reference light spot. The other optical path transmits through the first NPBS 14, is directed towards the first working surface 211 through the collimation module 15, is reflected by the semi-transmissive and semi-reflective film 212 in the pentaprism 21, returns along the original path to the first NPBS 14, and then is reflected by the beam splitting surface of the first NPBS 14 and is received by the signal camera 19 to form a first beacon light spot. The TSSOC system is adjusted by the first optical adjustment platform 3 to make the reference light spot coincide with the first beacon light spot, and the initial position of the first optical adjustment platform 3 is determined. The optical axis of the outgoing light of the TSSOC system when the reference light spot coincides with the first beacon light spot is the vertical optical axis.

[0058] S3. The camera under test 22 is placed on the second optical adjustment platform 4 so that the intersection of the vertical optical axis and the reference optical axis is directly in front of the light inlet 221 of the camera under test 22, and the pentaprism 21 is removed from the second optical adjustment platform 4. The light emitted by the beacon light source 16 is reflected by the PBS 13 and then divided into two optical paths at the beam splitting surface of the first NPBS 14. One optical path forms a reference light spot, and the other optical path transmits through the first NPBS 14, is directed towards the second reflector 23 through the collimation module 15, and is reflected back to the first NPBS 14 under the reflection of the second reflector 23, and then is reflected by the beam splitting surface of the first NPBS 14 and is received by the signal camera 19 to form a second beacon light spot. The position of the camera under test 22 on the second optical adjustment platform 4 is adjusted to make the reference light spot coincide with the second beacon light spot, and the position of the camera under test 22 on the second optical adjustment platform 4 is determined.

[0059] S4. The simulated light source 11 is turned on to simulate the observed object. The horizontal deflection angle of the second optical adjustment platform 4 is adjusted to simulate the change in the incident angle of stray light in the usage scenario of the camera under test 22. When the horizontal deflection angle of the second optical adjustment platform 4 changes, the horizontal deflection angle, pitch angle and its position on the table surface of the second optical adjustment platform 4 of the first optical adjustment platform 3 are dynamically adjusted to keep the reference light spot in a state of coincidence with the second beacon light spot, so as to complete the dynamic compensation of the position of the camera under test 22 relative to the simulated light in the scenario of dynamic change of the incident angle of stray light, and finally complete the dynamic alignment of the camera under test 22 and the observed object.

[0060] Specifically, S2 further includes that the light from the first NPBS14 is directed towards the reticle in the collimation module 15 to form a crosshair image. The crosshair image is reflected by the pentaprism 21 and returns along the original path and is directed towards the first NPBS14. Subsequently, it is reflected by the beam-splitting surface of the first NPBS14 and exits the first NPBS14 and is received by the signal camera 19. By adjusting the horizontal deflection angle, pitch angle of the first optical adjustment platform 3 and its position on the surface of the second optical adjustment platform 4, the first beacon light spot is located at the center of the crosshair image received by the signal camera 19 to correct the vertical optical axis and further improve the accuracy of the vertical optical axis.

[0061] In summary, this embodiment proposes a multi-optical axis online compensation alignment system for a space environment simulation system. The TSSOC system therein is used to send the simulation light simulating the observed object to the camera under test 22. The TSSOC system is internally provided with a beacon light source 16. The beacon light emitted by the beacon light source 16 is divided into two beams. One beam is always inside the TSSOC system and forms a reference light spot in the signal camera 19. The other beam passes through the second mirror 23 on the camera under test 22 and forms a second beacon light spot in the signal camera 19. In the scenario where the incident angle of stray light changes dynamically, by dynamically adjusting the position, horizontal offset angle and pitch angle of the TSSOC system, the reference light spot and the second beacon light spot are always kept in a coincident state, and thus the position of the camera under test 22 relative to the simulation light can be dynamically compensated based on the scenario where the incident angle of stray light changes dynamically, and finally the dynamic alignment of the camera under test 22 and the observed object is completed.

[0062] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-optical axis online compensation alignment system for space environment simulation system, characterized by: The invention comprises a TSSOC system, a pentaprism (21), a stray light simulation system (5), a first optical adjustment platform (3), a second optical adjustment platform (4) and a second reflector (23); the TSSOC system comprises a simulated light source (11), an LCOS display (12), a PBS (13), a first NPBS (14), a collimating module (15), a beacon light source (16), a first collimating mirror (17), a first reflector (18) and a signal camera (19); the collimating module (15) has a built-in improved Petzval lens, and the improved Petzval lens is a lens formed by gluing a meniscus lens with negative optical power to a position of the basic structure of the Petzval lens close to the pentaprism (21) or the camera to be tested (22); the relative positions of all components in the TSSOC system are fixed, the first optical adjustment platform (3) is used to adjust the horizontal deflection angle and the pitch angle of the TSSOC system, and the first optical adjustment platform (3) is located on the second optical adjustment platform (4); The pentaprism (21) is used to deflect incident light by 90 degrees. The two surfaces of the pentaprism (21) for light to enter and exit are a first working surface (211) and a second working surface. The second working surface is coated with a semi-transparent and semi-reflective film (212). The second reflector (23) is installed on the camera to be tested (22) and is adjacent to the light entrance (221) of the camera to be tested (22). The second reflector (23) is perpendicular to the optical axis of the light entrance (221) of the camera to be tested (22). The second optical adjustment platform (4) is used to adjust the horizontal deflection angle and the pitch angle of the first optical adjustment platform (3), the pentaprism (21) and the camera to be tested (22); the pentaprism (21) and the camera to be tested (22) are not present on the second optical adjustment platform (4) at the same time, the pentaprism (21) is first placed on the second optical adjustment platform (4), and when the optical axis of the collimating module (15) is perpendicular to the first working surface (211) and the output optical axis of the stray light simulation system (5) is perpendicular to the second working surface, the pentaprism (21) is replaced by the camera to be tested (22), and the second reflector (23) is used to reflect light from the collimating module (15); The light splitting surface of the PBS (13) and the light splitting surface of the first NPBS (14) are parallel to each other; the PBS (13), the first collimator (17), the collimator module (15) and the signal camera (19) are sequentially distributed around the four directions of the first NPBS (14); the LCOS display (12), the analog light source (11), the first NPBS (14) and the beacon light source (16) are sequentially distributed around the four directions of the PBS (13); the first collimator (17) is located between the first NPBS (14) and the first reflector (18); The analog light source (11) is used to emit analog light to the PBS (13); the beacon light source (16) is used to emit beacon light to the PBS (13); the LCOS display (12) is used to reflect light from the PBS (13) back to the PBS (13); the first collimator (17) is used to vertically direct light from the first NPBS (14) toward the first reflector (18); the first reflector (18) is used to reflect light from the first collimator (17) back to the first collimator (17) along the original path; the signal camera (19) is used to receive light from the first NPBS (14); and the collimator module (15) is used to collimate light from the first NPBS (14), light directed toward the first NPBS (14) from the first working surface (211), and light directed toward the first NPBS (14) from the second reflector (23).

2. The multi-optical axis online compensation alignment system for a space environment simulation system according to claim 1, characterized in that: The collimation module (15) has a built-in graticule plate, and the graticule plate has crosshairs.

3. The multi-optical axis online compensation alignment system for a space environment simulation system according to claim 1, characterized in that: The invention also comprises a beacon collimator (110), through which the beacon light emitted by the beacon light source (16) is directed toward the PBS (13).

4. The multi-optical axis online compensation alignment system for a space environment simulation system according to any one of claims 1 to 3, characterized in that: The stray light simulation system (5) comprises a stray light source (51), a first graticule (52), a second graticule (53), an aiming light source (54), a second NPBS (55) and a second collimator (56); The first grating plate (52) and the second grating plate (53) are respectively located on two adjacent sides of the second NPBS (55), and the first grating plate (52) and the second grating plate (53) are respectively located on two sides of the light splitting surface of the second NPBS (55); the light emitted by the alignment light source (54) passes through the second grating plate (53) and then radiates toward the second NPBS (55); the second collimator (56) is used to collimate the light from the second NPBS (55) and the light radiated from the second working surface toward the second NPBS (55); the first grating plate (52) and the second grating plate (53) are both provided with crosshairs; the alignment light source (54) is used to form a crosshair image of the second grating plate (53); the crosshair image of the second grating plate (53) passes through the second NPBS (55), the second collimator (56) and the second working surface in sequence, and then returns to the original path and is projected onto the first grating plate (52); The stray light source (51) sequentially enters the first graticule (52), the second NPBS (55) and the second collimator (56) and then is emitted.

5. The multi-optical axis online compensation alignment system for a space environment simulation system according to claim 4, characterized in that: Two second graticule plates (53) are provided, and the light emitted by the alignment light source (54) is emitted toward the second NPBS (55) after passing through the two second graticule plates (53). The crosshairs on the two second graticule plates (53) are aligned, and there is only one crosshair image of the second graticule plate (53) on the first graticule plate (52).

6. The multi-optical axis online compensation alignment system for a space environment simulation system according to claim 4, characterized in that: The stray light simulation system (5) further comprises a microscope module (57), wherein the microscope module (57) is arranged on a side of the first grating plate (52) away from the second NPBS (55), and the microscope module (57) is used to observe the first grating plate (52).

7. The multi-optical axis online compensation alignment system for a space environment simulation system according to claim 4, characterized in that: The stray light simulation system (5) further comprises a third reflector (58), through which light from the second NPBS (55) is directed toward the second collimator (56), and light from the second collimator (56) is directed toward the second NPBS (55) through the third reflector (58).

8. The multi-optical axis online compensation alignment system for a space environment simulation system according to claim 7, characterized in that: The light emitted by the second collimator (56) is perpendicular to the second graticule (53).

9. A multi-optical axis online compensation alignment method for a space environment simulation system, characterized in that: Using the multi-optical axis online compensation alignment system for a space environment simulation system according to any one of claims 1 to 8, the specific steps include: S1, taking the output optical axis of the stray light simulation system (5) as the reference optical axis, adjusting the pentaprism (21) through the second optical adjustment platform (4) so ​​that the second working surface is perpendicular to the reference optical axis; S2, the simulation light source (11) is turned off, and the beacon light source (16) is turned on; the light emitted by the beacon light source (16) is reflected by the PBS (13) and then divided into two light paths at the light splitting surface of the first NPBS (14); one light path passes through the first collimator (17) and is reflected back to the first NPBS (14) by the first reflector (18), then transmits out of the first NPBS (14) and is received by the signal camera (19) to form a reference light spot; the other light path transmits out of the first NPBS (14) and passes through the collimator module (15) The light is emitted toward the first working surface (211), and after being reflected by the semi-transparent and semi-reflective film (212) in the pentaprism (21), it returns to the first NPBS (14) along the original path, and then is reflected out of the first NPBS (14) by the light splitting surface of the first NPBS (14) and is received by the signal camera (19) to form a first beacon light spot; the TSSOC system is adjusted through the first optical adjustment platform (3) so that the reference light spot coincides with the first beacon light spot; when the reference light spot coincides with the first beacon light spot, the TSSOC system output light axis is a vertical light axis; S3, placing the camera to be tested (22) on the second optical adjustment platform (4) so ​​that the intersection of the vertical optical axis and the reference optical axis is located directly in front of the light entrance (221) of the camera to be tested (22), and the light emitted by the beacon light source (16) is reflected by the PBS (13) and then divided into two light paths at the light splitting surface of the first NPBS (14), one light path forming a reference light spot, and the other light path transmitting out of the first NPBS (14) and radiating to the second reflector (23) through the collimating module (15), and then returning to the first NPBS (14) along the original path under the reflection of the second reflector (23), and then being reflected out of the first NPBS (14) by the light splitting surface of the first NPBS (14) and being received by the signal camera (19) to form a second beacon light spot; adjusting the position of the camera to be tested (22) on the second optical adjustment platform (4) so ​​that the reference light spot coincides with the second beacon light spot; S4, turning on the simulated light source (11) to simulate the observed object; adjusting the horizontal deflection angle of the second optical adjustment platform (4) to simulate the change in the incident angle of stray light in the use scene of the camera to be tested (22); when the horizontal deflection angle of the second optical adjustment platform (4) changes, dynamically adjusting the horizontal deflection angle, the pitch angle and the position of the first optical adjustment platform (3) on the surface of the second optical adjustment platform (4) so ​​that the reference light spot remains in a state of coinciding with the second beacon light spot.

10. The multi-optical axis online compensation alignment method for a space environment simulation system according to claim 9, characterized in that: The collimation module (15) has a built-in graticule plate, and the graticule plate has crosshairs; S2 also includes that light from the first NPBS (14) is emitted to the graticule plate in the collimation module (15) to form a crosshair image, and the crosshair image is reflected by the pentaprism (21) and then returns to the original path and is emitted to the first NPBS (14), and then is reflected by the splitting surface of the first NPBS (14) out of the first NPBS (14) and received by the signal camera (19); by adjusting the horizontal deflection angle and the pitch angle of the first optical adjustment platform (3) and its position on the surface of the second optical adjustment platform (4), the first beacon light spot is located at the center of the crosshair image received by the signal camera (19).

Images