CN108801573B - Spacecraft high-resolution camera optical axis jitter micro-vibration source ground simulation device - Google Patents
Spacecraft high-resolution camera optical axis jitter micro-vibration source ground simulation device Download PDFInfo
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- CN108801573B CN108801573B CN201810612597.3A CN201810612597A CN108801573B CN 108801573 B CN108801573 B CN 108801573B CN 201810612597 A CN201810612597 A CN 201810612597A CN 108801573 B CN108801573 B CN 108801573B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a ground simulation device for a micro-optic axis shaking micro-vibration source of a high-resolution camera, which mainly comprises a bearing system part and an excitation system part, wherein the bearing system part is used for bearing test loads; the excitation system part mainly comprises an excitation device, an excitation rod, a control sensor and a control system, wherein the excitation device is fixed on the lifting platform and is connected with the mounting plate through the excitation rod and the control sensor, a single-point control mode is adopted, the computer control system outputs a driving signal, the driving signal is output to a signal amplifier after modulation and is input to the excitation device, the table top is enabled to vibrate, the control sensor feeds back mechanical parameters to the calculation control system for comparison and correction, and the mechanical parameter response generated by the driving signal on the excitation device is enabled to meet the experimental requirements. The device can accurately and quantitatively simulate the in-orbit micro-vibration shaking of the optical axis of the high-resolution camera on the ground, and further provides test guarantee for the design of micro-vibration sensitive satellite loads such as a high-resolution satellite.
Description
Technical Field
The invention belongs to the technical field of spacecraft interference source micro-vibration tests, and particularly relates to a spacecraft high-resolution camera optical axis shaking micro-vibration source ground simulation device.
Background
With the continuous improvement of the requirements of the satellite space camera on the space resolution and the like, the requirements of some satellites on the on-orbit micro-vibration environment are very strict, and the borne tasks also require that the satellite body has the extremely low on-orbit micro-vibration environment, such as a high-resolution earth observation system. Therefore, the performance and precision of various high-precision cameras with fine designs far exceed those of the existing models, and particularly, the performance requirement of high resolution causes the sensitivity of the spacecraft to micro-vibration to be increased, the influence of satellite micro-amplitude jitter on the imaging quality cannot be ignored, and when the influence of the disturbance amplitude on the imaging quality of the camera reaches an unacceptable degree, effective measures must be taken to suppress or compensate.
At present, the imaging quality under the influence of high-precision payload micro-vibration can only be verified through simulation analysis, a system-level verification means is lacked, system-level test verification can only be carried out on the whole satellite after AIT is delivered, the verification cost is high, the period is long, the risk is high, and once the test result cannot meet the requirement, the development progress is seriously influenced. Therefore, it is necessary to perform a test verification of the imaging quality under the influence of the micro-vibration of the high-precision payload on the ground, and if the test verification is performed, a ground accurate simulation of the micro-vibration environment of the camera in orbit is required.
The influence of the on-satellite micro-vibration environment on the camera can be characterized by optical axis jitter. The optical axis jitter is represented by a change in the pointing angle of the optical axis, which can be described as two angles θ x, θ y orthogonal to each other. Although the shake of the space camera includes three translations and three rotations, the most important factor causing the image blur is the change of the pointing angles θ x and θ y of the optical axis, which is mainly caused by the fact that the space camera is far away from the ground and the change of the pointing angle of the optical axis corresponds to a large image shift. The variation of the pointing angle of the optical axis is equal to the ratio of the focal plane image shift to the focal length (or the ratio of the ground image shift to the track height)
When theta x changes, we refer to the pitching condition, and when theta y changes, we refer to the yawing condition.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a spacecraft high-resolution camera optical axis shaking micro-vibration source ground simulation device, which can simulate a micro-vibration environment of a satellite in an in-orbit state on the ground and provide angular displacement quantitative simulation of pitching and yawing micro-vibration working conditions for a high-resolution camera optical axis.
The invention adopts the following technical scheme:
the high-resolution camera optical axis shaking micro-vibration source ground simulation device mainly comprises a bearing system part and an excitation system part, wherein the bearing system part for bearing test load mainly comprises a mounting plate and a six-degree-of-freedom tool supported by the bottom of the mounting plate; the excitation system part for providing quantitative excitation mainly comprises an excitation exciter, an excitation rod, a control sensor and a control system, wherein one end of the excitation rod is fixed on a lifting platform, the other end of the excitation rod is connected with a mounting plate through the excitation rod and the control sensor adhered on a transfer block, then the height of the lifting platform is adjusted, the control sensor arranged between the mounting plate and the excitation rod is used for monitoring output mechanical parameters, a single-point control mode is adopted, a computer control system outputs a driving signal, the driving signal is output to a signal amplifier after zero modulation and then is input to the excitation rod, so that the table top generates vibration, the response of a control point is compared and corrected by feeding the mechanical parameters back to the computer control system through the control sensor, and the mechanical parameter response generated by the driving signal on the excitation rod meets the.
Wherein, the control sensor can be a micro-vibration sensor or a force sensor, and is used for monitoring the output force and the acceleration value respectively.
Wherein, the mounting plate upper surface has the installation interface, is used for setting up experimental product such as camera.
The six-degree-of-freedom tool provides an approximate free state for the camera, the lower end of the six-degree-of-freedom tool is fixed on a test basis, a test product is arranged behind the bearing system, the front 3-order modal frequency of the system is smaller than 3Hz, and the front 6-order modal frequency of the system is smaller than 5 Hz.
Wherein the mechanical parameter is acceleration.
When the yaw direction of the optical axis of the camera is excited, the height of the lifting platform is adjusted, and the excitation rod and the control sensor are directly connected to the mounting plate to excite the camera.
The angular displacement sensor and the angular displacement measuring system are arranged near the control sensor, and after angular displacement signals are measured by the angular displacement measuring system and the angular displacement sensor, the control system performs linear calculation to obtain required mechanical parameters, so that quantitative angular displacement micro-vibration signals are provided for the simulation device.
When the pitching direction of the camera optical axis is excited, the height of the lifting platform is reduced, the vibration exciter is arranged at the bottom of the camera, and the vibration exciting rod and the control sensor are directly connected to the lower surface of the mounting plate to excite vibration.
The device can accurately and quantitatively simulate the in-orbit micro-vibration shaking of the optical axis of the high-resolution camera on the ground, and further provides test guarantee for the design of micro-vibration sensitive satellite loads such as a high-resolution satellite.
Drawings
FIG. 1 is a schematic structural diagram of a high-resolution camera optical axis dithering micro-vibration source ground simulation device under a pitching working condition according to an embodiment of the present invention;
wherein, 1, mounting a plate; 2. a six-degree-of-freedom tool; 3. a vibration exciter; 4. an excitation rod; 5. a lifting platform; 6. a control sensor; 7. a load to be measured; 8. an angular displacement sensor.
FIG. 2 is a schematic structural diagram of a high-resolution camera optical axis dithering micro-vibration source ground simulation apparatus under a yaw working condition according to an embodiment of the present invention;
wherein, 1, mounting a plate; 2. a six-degree-of-freedom tool; 3. a vibration exciter; 4. an excitation rod; 5. a lifting platform; 6. a control sensor; 7. a load to be measured; 8. an angular displacement sensor.
Detailed Description
The present invention will be described in further detail with reference to the attached drawings, which are only illustrative and not intended to limit the scope of the present invention in any way.
The invention relates to a high-resolution camera optical axis shaking micro-vibration source ground simulation device which mainly comprises a bearing system and a vibration excitation system.
The bearing system mainly comprises a mounting plate 1 and a six-degree-of-freedom tool 2, and the bearing part is mainly used for bearing test loads, has a vibration isolation function and can enable a product to be in an approximately unconstrained free state.
The excitation system comprises an excitation device 3, an excitation rod 4, a control sensor 6, a control system and an angular displacement sensor 8, and is mainly used for providing quantitative excitation for the system. The selection of the vibration exciter 3 is an important link, because the micro-vibration environment simulation is required, the output precision of a common modal vibration exciter is poor, the working frequency is generally 5 Hz-10 kHz, the waveform distortion of a low-frequency band is large, the background noise is up to more than dozens of millivolts, and the output of 1 mg-10 mg level is difficult to realize. Therefore, the excitation equipment for calibration is adopted, so that better linear output within the range of DC-200 Hz can be realized, and the resolution of the excitation force is 0.1 mg.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of a high resolution camera optical axis shake micro-vibration source ground simulation device under a pitching condition according to an embodiment of the present invention; under the pitching working condition, as shown in fig. 1, the load 7 to be measured is installed on the installation plate 1 in a threaded manner, the installation plate 1 is installed on the six-degree-of-freedom tooling 2 in a threaded manner, and the six-degree-of-freedom tooling 2 is fixed on a foundation in a crimping or threaded manner. The lifting platform 5 is placed on the ground on the side face of the mounting plate, the vibration exciter 3 is fixedly mounted on the lifting platform 5 through bolts or other modes, the axis of the vibration exciter 3 is perpendicular to the lower surface of the mounting plate, the height of the platform 5 is reduced firstly, and the position of the lifting platform on the ground is adjusted, so that the axis of the vibration exciter 3 is just located under the lower surface of the mounting plate and close to the center of the edge. One end of the excitation rod 4 is arranged on a mounting hole in the central axis of the vibration exciter, the control sensor 6 is fixed at the other end of the excitation rod 4 through threads or other modes, finally, the height of the lifting platform 5 is adjusted, the surface of the control sensor is equal to the lower surface of the mounting plate in height, and the control sensor 6 is fixedly connected with the switching block through bolts or other modes.
FIG. 2 is a schematic structural diagram of a high-resolution camera optical axis dithering micro-vibration source ground simulation apparatus under a yaw condition according to an embodiment of the present invention; under the working condition of yawing, the load 7 to be measured is mounted on the mounting plate 1 in a threaded manner, the mounting plate 1 is mounted on the six-degree-of-freedom tool 2 in a threaded manner, and the six-degree-of-freedom tool 2 is fixed on a foundation in a crimping or threaded manner. The method comprises the steps of placing a lifting platform 5 on the ground on the side face of a mounting plate, fixedly mounting a vibration exciter 3 on the lifting platform 5 through a bolt connection or other modes, wherein the height of the lifting platform 5 is adjusted to be equal to the height of the center axis of the mounting plate, adjusting the distance between the vibration exciter and the mounting plate by adjusting the position of the lifting platform on the ground, installing one end of a vibration exciting rod 4 on a mounting hole in the center axis of the vibration exciter, fixing a control sensor 6 at the other end of the vibration exciting rod 4 through threads or other modes, and finally, fixedly connecting the vibration exciter with the position, close to a corner, of the side face of the mounting plate 1 through the control sensor 6 through a bolt or other modes.
The control sensor 6, such as a force sensor and a micro-vibration acceleration sensor, monitors the output force and the acceleration value. In the excitation simulation process, a single-point control mode is adopted, and a computer control system outputs a driving signal, the driving signal is output to a signal amplifier after zero modulation and then is input to an exciter 3, so that the table top vibrates. The response of the control point is fed back to a calculation control system by a micro-vibration sensor (acceleration) for comparison and correction, so that the acceleration response generated by the driving signal on the vibration exciter 3 meets the experimental requirements. Because the test requires that the control output signal is angular displacement, but the existing control system can only meet the closed-loop control of a force or acceleration signal, the required force or acceleration is obtained by firstly measuring the angular displacement signal through the angular displacement sensor 8 and then carrying out linear calculation through the control system through open-loop debugging in the test.
The present invention is not limited to the above-described embodiments, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but rather should be protected within the scope of the appended claims.
Claims (9)
1. The high-resolution camera optical axis shaking micro-vibration source ground simulation device mainly comprises a bearing system part and an excitation system part, wherein the bearing system part for bearing test load mainly comprises a mounting plate and a six-degree-of-freedom tool supported by the bottom of the mounting plate; the excitation system part for providing quantitative excitation mainly comprises an excitation exciter, an excitation rod, a control sensor and a control system, wherein one end of the excitation rod is fixed on a lifting platform, the other end of the excitation rod is connected with a mounting plate through the excitation rod mounting control sensor, the height of the lifting platform is then adjusted, the control sensor mounted between the mounting plate and the excitation rod is used for monitoring output mechanical parameters, a single-point control mode is adopted, a computer control system outputs a driving signal, the driving signal is output to a signal amplifier after zero modulation and then is input to the excitation rod, the table top is enabled to vibrate, the response of a control point is compared and corrected by feeding the mechanical parameters back to the computer control system through the control sensor, and the mechanical parameter response generated by the driving signal on the excitation rod meets the.
2. The terrain simulator of claim 1, wherein the control sensor is a micro-vibration sensor or a force sensor that monitors output force and acceleration, respectively.
3. The floor simulator of claim 1, wherein the mounting plate has a mounting interface on an upper surface thereof for mounting the test product.
4. The ground simulating assembly of claim 1 wherein the test product is a camera.
5. The ground simulator of claim 1, wherein the six-degree-of-freedom tooling provides an approximate free state for the camera, the lower end of the six-degree-of-freedom tooling is fixed on a test base, the test product is arranged behind the carrying system, and the front 3-order modal frequency of the system is less than 3Hz and the front 6-order modal frequency of the system is less than 5 Hz.
6. A ground simulating assembly according to any one of claims 1 to 5 wherein the mechanical parameter is acceleration.
7. The floor simulator of claim 6, wherein the excitation rod and the control sensor are directly attached to the side surface of the mounting plate for excitation after adjusting the height of the elevating platform when exciting the yaw direction of the optical axis of the camera.
8. The ground simulator of claim 6, wherein an angular displacement sensor and an angular displacement measuring system are disposed near the control sensor, and after angular displacement signals are measured by the angular displacement measuring system and the angular displacement sensor, the control system performs linear calculation to obtain required mechanical parameters, thereby providing quantitative angular displacement micro-vibration signals for the simulator.
9. The floor simulation apparatus of claim 6, wherein the elevation platform is lowered in height when the elevation direction of the optical axis of the camera is excited, the exciter is provided at the bottom of the camera, and the exciting rod and the control sensor are directly connected to the lower surface of the mounting plate to excite the vibration.
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| CN109409338B (en) * | 2018-12-03 | 2020-10-27 | 西安交通大学 | Satellite micro-vibration source quantitative identification method based on blind source separation technology |
| CN110514286B (en) * | 2019-07-22 | 2021-10-01 | 北京空间机电研究所 | Method for measuring micro-vibration of optical axis of remote sensing satellite camera |
| CN110530508A (en) * | 2019-09-03 | 2019-12-03 | 吉林大学 | A kind of method and system detecting micro-vibration sensing device performance |
| CN111222544B (en) * | 2019-12-22 | 2023-05-02 | 同济大学 | Ground simulation test system for influence of satellite flutter on camera imaging |
| CN111157208A (en) * | 2020-02-27 | 2020-05-15 | 广州大学 | Satellite micro-vibration isolation simulation measurement system and method |
| CN111912592A (en) * | 2020-07-31 | 2020-11-10 | 上海卫星工程研究所 | Staring camera micro-vibration test equipment and method |
| CN113237622B (en) * | 2021-05-13 | 2023-04-07 | 西安科技大学 | Vibration testing system for onboard camera of heading machine |
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| FR2723810B1 (en) * | 1994-08-16 | 1996-10-25 | Matra Marconi Space France | TERRESTRIAL SENSOR DEVICE FOR SATELLITE OR THE LIKE, WITH PYROELECTRIC DETECTOR ARRAY |
| CN101038208A (en) * | 2007-02-06 | 2007-09-19 | 重庆大学 | Six-axial micro-exciter system |
| JP2011213313A (en) * | 2010-04-02 | 2011-10-27 | Mitsubishi Electric Corp | Spacecraft motion simulator |
| CN102798514A (en) * | 2012-08-08 | 2012-11-28 | 中国科学院长春光学精密机械与物理研究所 | Method for detecting imaging resolution of aerial camera in high-altitude environment condition |
| CN103616149B (en) * | 2013-11-22 | 2016-08-17 | 北京卫星环境工程研究所 | Whole star micro-vibration ground experiment free boundary analog supports frequency test method |
| KR101591939B1 (en) * | 2014-05-19 | 2016-02-04 | 팸텍주식회사 | Shake the camera module test equipment |
| CN104469357B (en) * | 2014-12-30 | 2016-12-07 | 中国科学院长春光学精密机械与物理研究所 | The test system that long-focus camera imaging quality is affected by micro-vibration |
| CN105530514A (en) * | 2016-01-28 | 2016-04-27 | 长光卫星技术有限公司 | Testing device for affect of satellite platform micro-vibration on camera imaging |
| CN107543672B (en) * | 2016-12-27 | 2019-07-05 | 北京卫星环境工程研究所 | Multiple degrees of freedom micro-vibration environmental simulation method |
| CN107167302A (en) * | 2017-07-12 | 2017-09-15 | 北京卫星环境工程研究所 | Vacuum low-temperature environment imaging shaking detection device based on off-axis collimated optical system |
| CN107782536B (en) * | 2017-09-14 | 2019-01-25 | 北京空间飞行器总体设计部 | A kind of multi-level micro-vibration system test method and system |
| CN107643156A (en) * | 2017-10-30 | 2018-01-30 | 长春工业大学 | Three axle rotational shaking tables |
| CN107741702A (en) * | 2017-10-30 | 2018-02-27 | 长春工业大学 | Complicated opto-mechanical part IMAQ ground simulation platform stance disturbing generating device |
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