CN102679893B - Method for determining thickness of focusing ring of star sensor - Google Patents
Method for determining thickness of focusing ring of star sensor Download PDFInfo
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- CN102679893B CN102679893B CN201210156304.8A CN201210156304A CN102679893B CN 102679893 B CN102679893 B CN 102679893B CN 201210156304 A CN201210156304 A CN 201210156304A CN 102679893 B CN102679893 B CN 102679893B
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Abstract
The invention discloses a method for determining the thickness of a focusing ring of a star sensor. The method comprises the following steps of: at first, establishing a focusing system consisting of a focusing board and four star points and arranging the focusing system in a dark room, so as to improve the precision of imaging positions of the star points; analyzing the thickness of the focusing ring by using the four star points at the different positions, so as to improve the focusing accuracy; comparing a maximum luminance value of the star points with a maximum luminance value on a red focal plane, and valuing within a certain range, so as to improve the accuracy of the star sensor working in vacuum; and focusing according to a size of a star spot, so as to improve the precision of the star sensor. A signal-to-noise ratio of a star map can be improved by accurately focusing; the anti-edge jamming capability of the star points can be enhanced; the method provided by the invention can ensure the accuracy, the stability and the sensitivity of the APS (Active Protection System) star sensor; and the high-precision posture output is realized. The method can be widely applied to various star sensor systems.
Description
Technical field
The present invention relates to a kind of method determining star sensor focusing ring thickness, belong to APS Star-Sensor Design technical field.
Background technology
The feature of APS star sensor is high precision, long-life, high data updating rate and miniaturization.Focusing is a key link during star sensor product design is produced, focusing can change asterism imaging area, gross energy size, peak energy size, and then affect the extraction accuracy of asterism barycenter, the sensitivity of star sensor, also can affect the stated accuracy of later stage star sensor simultaneously.Be showed no the relevant report determining Rotating Platform for High Precision Star Sensor focusing ring thickness approach both at home and abroad at present.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provides a kind of method determining star sensor focusing ring thickness, improves the accuracy of focusing.
Technical solution of the present invention is: a kind of method determining star sensor focusing ring thickness, and step is as follows:
(1) set up the focusing system be made up of a focusing plate and four asterisms and be arranged in darkroom, point centered by first asterism (0), second asterism (1) is on the right of first asterism (0), the horizontal range of two asterism positions is 0.5 visual field, 3rd asterism (2) is on the right of first asterism (0), the horizontal range of two asterism positions is 0.8 visual field, 4th asterism (3) is in the below of first asterism (0), the horizontal range of two asterism positions is 0.5 visual field, four asterisms adopt parallel light tube luminous, focusing plate surface painted black,
(2) focusing ring of different-thickness is arranged between optical lens and detector body, by the star sensor installing different-thickness focusing ring imaging carried out to the asterism of four diverse locations and processed by the asterism image of data handling machine to sampling, obtaining brightness and the star spot size of four asterisms corresponding to different focusing ring thickness;
(3) change adding up lower first the asterism brightness of different-thickness focusing ring obtains the maximal value of first asterism brightness, obtains ruddiness focal plane, using the focusing ring corresponding to ruddiness focal plane as benchmark focusing ring according to the maximal value of first asterism brightness;
(4) with the thickness of benchmark focusing ring for focusing ring thickness is reduced 5um, 10um and 15um by benchmark respectively, re-use star sensor carry out imaging to the asterism of four diverse locations and processed by the asterism image of data handling machine to sampling, obtain brightness and the star spot size of four asterisms corresponding to different focusing ring thickness, the focusing ring thickness obtained when to meet following three conditions is simultaneously final focusing ring thickness:
A the star spot of star such as () ruddiness 2 grade under four diverse locations is all less than 25 pixels;
B the maximum brightness value of star such as () ruddiness 2 grade at four asterism places is all not less than 80% of maximum brightness value on ruddiness focal plane;
C () first maximum brightness value of asterism (0) place star such as ruddiness 2 grade is maximum, blue light is minimum, infrared and visible ray is placed in the middle.
The present invention's beneficial effect is compared with prior art:
(1) in darkroom, establish the focusing system be made up of a focusing plate and four asterisms, simplify operating process, improve the precision of asterism image space.
(2) have employed four diverse location asterisms to analyze focusing ring thickness, improve the accuracy of focusing.
(3) using the focusing ring corresponding to ruddiness focal plane as benchmark focusing ring, reduce focusing ring thickness as focusing ring to be selected using benchmark focusing ring for benchmark, optimize the range of choice of focusing ring to be selected, improve focusing degree of accuracy and speed.
(4) maximum brightness value in asterism maximum brightness value and ruddiness focal plane to be compared, and value within the specific limits, make focusing under normal pressure meet performance under vacuum environment, improve the degree of accuracy that star sensor works in a vacuum.
(5) in focussing process, analyze star spot size and focus, avoid the interference of star spot excessive noise, the too small barycenter of star spot is unstable, improve precision of star sensor.
Accompanying drawing explanation
Fig. 1 is realization flow figure of the present invention;
Fig. 2 is focusing system schematic diagram of the present invention.
Embodiment
As shown in Figure 2, implementation of the present invention is as follows:
(1) set up the focusing system be made up of a focusing plate and four asterisms and be arranged in darkroom, Fig. 2 is seen in different asterism position, point centered by first asterism 0, second asterism 1 is on the right of first asterism 0, the horizontal range of two asterism positions is 0.5 visual field, 3rd asterism (2) is on the right of first asterism 0, the horizontal range of two asterism positions is 0.8 visual field, 4th asterism 3 is in the below of first asterism 0, the horizontal range of two asterism positions is 0.5 visual field, different asterism position is in table 1, four asterisms adopt parallel light tube luminous, focusing plate surface painted black, coordinate corresponding to different asterism position is as shown in table 1:
The coordinate that table 1 diverse location is corresponding
| Position | Coordinate |
| Position 0 | (512±3，512±3) |
| Position 1 | (768±3，512±3) |
| Position 2 | (921±3，512±3) |
| Position 3 | (512±3，768±3) |
(2) focusing ring of different-thickness is arranged between optical lens and detector body, by the star sensor installing different-thickness focusing ring imaging carried out to the asterism of four diverse locations and processed by the asterism image of data handling machine to sampling, obtaining brightness and the star spot size of four asterisms corresponding to different focusing ring thickness;
(3) change adding up lower first the asterism brightness of different-thickness focusing ring obtains the maximal value of first asterism brightness, obtains ruddiness focal plane, using the focusing ring corresponding to ruddiness focal plane as benchmark focusing ring according to the maximal value of first asterism brightness;
(4) with the thickness of benchmark focusing ring for focusing ring thickness is reduced 5um, 10um and 15um by benchmark respectively, re-use star sensor carry out imaging to the asterism of four diverse locations and processed by the asterism image of data handling machine to sampling, obtain brightness and the star spot size of four asterisms corresponding to different focusing ring thickness, the focusing ring thickness obtained when to meet following three conditions is simultaneously final focusing ring thickness:
A the star spot of star such as () ruddiness 2 grade under four diverse locations is all less than 25 pixels;
B the maximum brightness value of star such as () ruddiness 2 grade at four asterism places is all not less than 80% of maximum brightness value on ruddiness focal plane;
C () first maximum brightness value of asterism (0) place star such as ruddiness 2 grade is maximum, blue light is minimum, infrared and visible ray is placed in the middle.
The present invention carries out following checking after reinstalling the focusing ring determined:
The imaging of (d) diverse location
Observe the asterism of different spectrum, different brackets, star shape of spot still comparison rule.
(e) asterism Energy for Symmetrical
First asterism 0 place, the Energy for Symmetrical of ruddiness 2 ~ 5.5 grade is not less than the situation of its peripheral thickness focusing ring.
F () asterism peak value 3 × 3 region accounts for the size of whole asterism energy.
The star such as ruddiness 2 grade, infrared light 2 etc., visible ray 2 at position 0 place, centered by the pixel residing for asterism peak value, around, 3 × 3 pixel energy and a gross energy proportion of divining by astrology are not less than the situation of its peripheral thickness focusing ring.
The present invention sets up the focusing system that is made up of a focusing plate and four asterisms first and is arranged in darkroom, improves the precision of asterism image space; Have employed four diverse location asterisms to analyze focusing ring thickness, improve the accuracy of focusing; Maximum brightness value in asterism maximum brightness value and ruddiness focal plane is compared, and value within the specific limits, improve the degree of accuracy that star sensor works in a vacuum; Star spot size is taken into account focusing, improves the precision of star sensor.Accurate focusing can improve star chart signal to noise ratio (S/N ratio), strengthens the anti-marginal interference ability of asterism, can ensure the accuracy of APS star sensor, stability and sensitivity, and realize high-precision attitude and export, the method can be widely used in various star sensor system.
The non-detailed description of the present invention is known to the skilled person technology.
Claims (1)
1. determine a method for star sensor focusing ring thickness, it is characterized in that step is as follows:
(1) set up the focusing system be made up of a focusing plate and four asterisms and be arranged in darkroom, point centered by first asterism (0), second asterism (1) is on the right of first asterism (0), the horizontal range of two asterism positions is 0.5 visual field, 3rd asterism (2) is on the right of first asterism (0), the horizontal range of two asterism positions is 0.8 visual field, 4th asterism (3) is in the below of first asterism (0), the horizontal range of two asterism positions is 0.5 visual field, four asterisms adopt parallel light tube luminous, focusing plate surface painted black, whole focusing plate is square, length and width are respectively 1024 millimeters, to focus, plate central point starts, vertical range to focusing plate each edge is up and down defined as 1 visual field, length is 512 millimeters, and 0.5 visual field on focusing plate and 0.8 visual field represent distance focusing plate central point 256 millimeters and 409.6 millimeters respectively,
(2) focusing ring of different-thickness is arranged between optical lens and detector body, by the star sensor installing different-thickness focusing ring imaging carried out to the asterism of four diverse locations and processed by the asterism image of data handling machine to sampling, obtaining brightness and the star spot size of four asterisms corresponding to different focusing ring thickness;
(3) change adding up lower first the asterism brightness of different-thickness focusing ring obtains the maximal value of first asterism brightness, obtains ruddiness focal plane, using the focusing ring corresponding to ruddiness focal plane as benchmark focusing ring according to the maximal value of first asterism brightness;
(4) with the thickness of benchmark focusing ring for focusing ring thickness is reduced 5um, 10um and 15um by benchmark respectively, re-use star sensor carry out imaging to the asterism of four diverse locations and processed by the asterism image of data handling machine to sampling, obtain brightness and the star spot size of four asterisms corresponding to different focusing ring thickness, the focusing ring thickness obtained when to meet following three conditions is simultaneously final focusing ring thickness:
A the star spot of star such as () ruddiness 2 grade under four diverse locations is all less than 25 pixels;
B the maximum brightness value of star such as () ruddiness 2 grade at four asterism places is all not less than 80% of maximum brightness value on ruddiness focal plane;
C () first maximum brightness value of asterism (0) place star such as ruddiness 2 grade is maximum, blue light is minimum, infrared and visible ray is placed in the middle.
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| CN105357435B (en) * | 2015-10-30 | 2018-10-09 | 北京控制工程研究所 | A kind of daytime environment Stellar orientation instrument focus adjustment method |
| CN112683178B (en) * | 2019-10-18 | 2022-07-15 | 北京华航无线电测量研究所 | Gasket thickness determining method for assembling optical lens and photoelectric detector |
| CN111323210B (en) * | 2020-03-17 | 2021-07-09 | 北京控制工程研究所 | Device and method for testing optical axis thermal stability of optical lens |
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| CN101209753A (en) * | 2006-12-25 | 2008-07-02 | 北京控制工程研究所 | Star sensor system imaging structure |
| CN101858755A (en) * | 2010-06-01 | 2010-10-13 | 北京控制工程研究所 | Method for calibrating star sensor |
| CN102116642A (en) * | 2009-12-31 | 2011-07-06 | 北京控制工程研究所 | Simulator of star sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001324660A (en) * | 2000-05-16 | 2001-11-22 | Sony Corp | Focus ring attaching structure for optical equipment |
| JP2011181677A (en) * | 2010-03-01 | 2011-09-15 | Tokyo Electron Ltd | Focus ring and substrate mounting system |
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| CN101209753A (en) * | 2006-12-25 | 2008-07-02 | 北京控制工程研究所 | Star sensor system imaging structure |
| CN102116642A (en) * | 2009-12-31 | 2011-07-06 | 北京控制工程研究所 | Simulator of star sensor |
| CN101858755A (en) * | 2010-06-01 | 2010-10-13 | 北京控制工程研究所 | Method for calibrating star sensor |
Non-Patent Citations (3)
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| APS星敏感器关键技术的研究;李杰;《中国博士学位论文全文数据库》;20061231;全文 * |
| 基于CMOS APS的星敏感器光学系统参数确定;董瑛等;《宇航学报》;20041130;第25卷(第6期);第663-669页 * |
| 星敏感器光学系统测试设备研究;周艳;《中国优秀硕士学位论文全文数据库》;20120228;全文 * |
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