CN100454079C - Astronomical telescope video CCD automatic guiding method - Google Patents
Astronomical telescope video CCD automatic guiding method Download PDFInfo
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- CN100454079C CN100454079C CNB2007100200417A CN200710020041A CN100454079C CN 100454079 C CN100454079 C CN 100454079C CN B2007100200417 A CNB2007100200417 A CN B2007100200417A CN 200710020041 A CN200710020041 A CN 200710020041A CN 100454079 C CN100454079 C CN 100454079C
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Abstract
This invention relates to one space telescope visual frequency CCD automatic guide method, which comprises the following steps: fixing visual frequency CCD in guide lens cylinder and main lens cylinder; through CCD image process getting space object image; rotating CCD to make the space image parallel along X direction and rectascension or declination for space object imaging by CCD; computer uses visual frequency to catch image for guide according to visual image and its changes.
Description
Technical field
The invention belongs to astronomical telescope research and manufacturing field, be specifically related to a kind of astronomical telescope video CCD automatic guiding method that is used for celestial body is carried out automatic guiding.
Background technology
Astronomical telescope needs for a long time, stably to observe a celestial body, reach high precision, and the automatic guiding method and apparatus must be arranged.To the automatic guiding of celestial body, three kinds of methods are arranged at present.
1, photoelectric tube automatic guiding.Its deficiency is, can't use substantially because of energy is too low faint objects such as fixed stars, and is very unstable again to the bright celestial body that the sun is such, and very responsive to the brightness of the sun, cloud amount, the daylight etc., precision is very low, so be eliminated substantially;
2, line array CCD or bar shaped CCD automatic guiding.Its deficiency is: the celestial body information of reception very little, precision is low, poor anti jamming capability;
3, big target surface area array CCD automatic guiding: performance is good, the precision height, but price is high, and guiding speed is also not ideal enough, even the professional astronomical observatory that has sufficient funds also is difficult to a large amount of outfits, is difficult to promote the use of.
Summary of the invention
Above-mentioned deficiency at prior art, the present invention will provide a kind of new video CCD automatic guiding method, this method can obtain high-precision celestial body mobile message with cheap general little target surface (1/3 ", 1/2 ") video CCD or camera, comprise guiding to all kinds of celestial bodies (for example fixed star, planet, the sun, the moon, artificial object etc.), guiding speed greatly improves, and cost can decline to a great extent.
The scheme of finishing the foregoing invention task is:
Video CCD automatic guiding method, step is as follows:
At a lens barrel that is used for guiding, video CCD or camera that guiding is used are installed, this CCD can both be used for observation as being contained on the body tube, was used for guiding again;
Handle by ccd image, obtain the image of celestial body;
Rotation CCD makes moving at directions X of celestial body parallel with right ascension or declination;
Computing machine obtains video image by capure card, carries out guiding according to this video image and variation thereof.
More particularly, after computing machine obtained video image by capure card, the treatment scheme of carrying out guiding was as follows:
1., obtain a two field picture, all processed for guaranteeing every two field picture, should dash in the full message (interruption) in district at the frame silk ribbon attached to an official seal or a medal of video card, obtain the view data of this frame;
2., to N two field picture stack, to eliminate the star picture shake that atmospheric disturbance causes, it is fixed with actual measurement guiding effect that N looks the guiding rate request, generally can choose at 20～50.General per second is caught 30 two field pictures, can provide one time the guiding signal in 2～5 seconds;
3., the image after the stack is done simple conventional denoising;
4., calculate the brightness center (x of stack back image
i, y
i), skew (the Δ x at relative first width of cloth figure brightness center
i, Δ y
i)=(x
i-x1, y
i-y1);
5., the spatial movement amount of day body image is:
(Δx
i*P
x，Δy
i*P
Y)
P
xBe the picture rate resolution of CCD at directions X, P
YBe picture rate resolution in the Y direction;
6., according to the spatial movement amount situation of star picture, revise the speed of telescope right ascension, declination, the mobile of star picture narrowed down in the required scope.If amount of movement surpasses the threshold values of setting (can be made as 10～20 pixels, so big deviation just often can not appear in guiding) too greatly, then suspend guiding, continue guiding when treating less than threshold values, can effectively solve and meet spissatus grade for abnormal problem;
7., circulation execution said process finishes until guiding.
The present invention has overcome the deficiencies in the prior art, the general little target surface video CCD that available rates is cheap obtains high-precision celestial body mobile message, effect stability, not being subjected to day luminance brightness to change and approach cloud influences, though run into spissatus for a long time, also can the automatic pause guiding, automatically continue guiding after waiting to disperse like the clouds, therefore even at cloudy weather, still can the whole day auto-guide, guarantee to greatest extent uninterruptedly observation.Guiding speed greatly improves simultaneously, and cost declines to a great extent.
Description of drawings
Fig. 1 is the single-frame images of celestial body;
Fig. 2 is through the celestial image after 50 stacks.
Embodiment
Embodiment 1, and video CCD automatic guiding method is handled by ccd image, obtains celestial image; Rotation CCD makes moving at directions X of celestial body parallel with right ascension or declination.To the sky volume imaging, computing machine obtains video image by capure card with video CCD, and treatment scheme is as follows:
1., obtain a two field picture, all processed for guaranteeing every two field picture, should dash in the full message (interruption) in district at the frame silk ribbon attached to an official seal or a medal of video card, obtain the view data of this frame;
2., to N two field picture stack, to eliminate the star picture shake that atmospheric disturbance causes, it is fixed with actual measurement guiding effect that N looks the guiding rate request, generally can choose at 20～50.General per second is caught 30 two field pictures, can provide one time the guiding signal in 2～5 seconds;
3., the image after the stack is done simple conventional denoising, gone processing such as background;
4., calculate the brightness center (x of every width of cloth stack back image
i, y
i), the skew at relative first width of cloth figure brightness center
(Δx
i，Δy
i)＝(x
i-x1，y
i-y1)；
5., the spatial movement amount of star picture is:
(Δx
i*P
x，Δy
i*P
Y)
P
xBe the picture rate resolution of CCD at directions X, P
YBe picture rate resolution in the Y direction;
6., according to the spatial movement amount situation of star picture, revise the speed of telescope right ascension, declination, the mobile of star picture narrowed down in the required scope.If amount of movement surpasses the threshold values of setting (can be made as 10-20 pixel), then suspend guiding, continue guiding when treating less than threshold values, can effectively solve the spissatus problem of meeting.
7., circulation execution said process finishes until guiding.
Application example 1:
In April, 2006, on the 65cm of astronomical observatory of Nanjing University optical telescope, realized the video CCD automatic guiding, use commercial MTV-1881EX video CCD, pixel resolution is 0.22 rad, 240 rads of 320 rads of * in visual field, 1 hour leading precision is 0.85 rad of right ascension 0.80 rad (RMS) and a declination; Leading precision right ascension was 0.96 rad in 4 hours, 0.9 rad of declination.
Application example 2:
In May, 2006, on full-time the video magnetoheliograph that is Beijing Observatory, with the automatic guiding (guiding to the sun be also referred to as leading) of video CCD realization to the sun, use commercial MTV-1881EX video CCD, pixel resolution is 1 rad, 240 rads of 320 rads of * in visual field, 1 hour leading precision is 0.50 rad of 1 hour right ascension 0.50 rad (RMS) and a declination; 4.5 0.90 rad of hour leading precision right ascension, 0.5 rad of declination.
Claims (2)
1, a kind of astronomical telescope video CCD automatic guiding method, step is as follows:
On guiding lens barrel or body tube, video CCD is installed;
Handle by ccd image, obtain the image of celestial body;
The rotation CCD, make moving of day body image parallel with right ascension or declination at directions X, with video CCD to the sky volume imaging;
Computing machine obtains video image with capure card, carries out guiding according to this video image and variation thereof;
After computing machine obtained video image by capure card, the treatment scheme of carrying out guiding was as follows:
1., obtain a two field picture, the described image of obtaining is to dash in the full message in district at the frame silk ribbon attached to an official seal or a medal of video card, obtains the view data of this frame;
2., to N two field picture stack, N looks the guiding rate request, chooses at 20～50;
3., the image after the stack is done conventional denoising, gone background process;
4., calculate the brightness center (x of stack back image
i, y
i), the skew at relative first width of cloth figure brightness center
(Δx
i，Δy
i)＝(x
i-x1，y
i-y1)；
5., the spatial movement amount of sun picture is:
(Δx
i*P
x，Δy
i*P
Y)，
Wherein, P
xBe the picture rate resolution of CCDX direction, P
YPicture rate resolution in the Y direction;
6., according to the spatial movement amount situation of sky body image, revise the speed of telescope right ascension, declination, the mobile of sun picture narrowed down in the required scope;
If amount of movement surpasses the threshold values of setting, then suspend guiding, continue guiding when treating less than threshold values;
7., circulation execution said process finishes until guiding.
According to the described astronomical telescope video CCD automatic guiding method of claim 1, it is characterized in that 2, described to the stack of N two field picture, N looks the guiding rate request, is that per second is caught 30 two field pictures, provides the guiding signal in 2～5 seconds one time.
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| CNB2007100200417A CN100454079C (en) | 2007-02-09 | 2007-02-09 | Astronomical telescope video CCD automatic guiding method |
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| CN100454079C true CN100454079C (en) | 2009-01-21 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928972B (en) * | 2012-12-05 | 2014-09-17 | 南京中科天文仪器有限公司 | Solar telescope guider taking optical wedge as refractive element |
| CN104049353B (en) * | 2014-07-04 | 2017-05-03 | 中国科学院国家天文台南京天文光学技术研究所 | Out-of-focus solar telescope guidscope based on pupil shield |
| CN104092948B (en) * | 2014-07-29 | 2016-05-11 | 小米科技有限责任公司 | Process method and the device of image |
| CN105892034A (en) * | 2016-04-22 | 2016-08-24 | 宁波舜宇光电信息有限公司 | Star tracker telescope and star tracking system and application thereof |
| CN107356986B (en) * | 2017-09-12 | 2023-06-27 | 中国科学院云南天文台 | Multiband combined astronomical science popularization system |
| CN111766696B (en) * | 2020-06-12 | 2021-09-17 | 中国科学院长春光学精密机械与物理研究所 | Method and device for eliminating image rotation of horizontal photoelectric telescope |
| CN112422788B (en) * | 2020-10-30 | 2021-10-15 | 中国科学院西安光学精密机械研究所 | Assembling mechanism of space astronomical camera capable of splicing guide star CCD |
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| JP2000305024A (en) * | 1999-04-16 | 2000-11-02 | Takahashi Seisakusho:Kk | Remote image pickup method of heavenly body |
| JP2003298915A (en) * | 2002-04-03 | 2003-10-17 | Telecommunication Advancement Organization Of Japan | Celestial body imaging/image distribution system and method thereof |
| CN1710377A (en) * | 2005-06-07 | 2005-12-21 | 中国科学院紫金山天文台 | Space-target real-time astronomical positioning method |
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Address after: 210042 Huayuan Road, Nanjing, Jiangsu Province, No. 6-10 Patentee after: Chinese Academy of Sciences, Nanjing Astronomical Instrument Co., Ltd. Address before: 210042 Huayuan Road, Nanjing, Jiangsu Province, No. 6-10 Patentee before: CAS Nanjing Astronomical Instruments Co., Ltd. |
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