CN101771188B - Pair surface self-adaption focusing method for radio telescope - Google Patents
Pair surface self-adaption focusing method for radio telescope Download PDFInfo
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- CN101771188B CN101771188B CN 200910264228 CN200910264228A CN101771188B CN 101771188 B CN101771188 B CN 101771188B CN 200910264228 CN200910264228 CN 200910264228 CN 200910264228 A CN200910264228 A CN 200910264228A CN 101771188 B CN101771188 B CN 101771188B
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Abstract
The invention relates to a pair surface self-adaption focusing method for a radio telescope. The method comprises the following steps of: arranging temperature sensors on a panel and a back frame of an antenna; performing pair surface longitudinal focusing by an astronomical method to record focusing information, wherein the focusing information comprises the focusing amount fitted by each turn of focusing, time observed at the point corresponding to the maximum of the source strength in each turn, the position of the antenna and the temperature value of each temperature sensor; according to the recorded information during focusing, analyzing the rule of the focusing amount and the temperature and the rule of the focusing amount and the temperature difference between the panel and the back frame to obtain the relationship between the focusing amount and the average temperature difference of the panel and the back frame; and performing self-adaption focusing by a pair surface control program based on the relationship obtained from the previous step, namely, according to the temperature difference measured by the temperature sensor and the relationship between the focusing amount and the temperature difference of the panel and the back frame, calculating the pair surface focusing amount in real time, correcting the pair surface in real time to make the pair surface at a proper position.
Description
Technical field
The present invention relates to the astronomical observation field, be specifically related to a kind of pair surface self-adaption focusing method of radio astronomical telescope.
Background technology
The focal length that operates in the heavy caliber radio telescope under the natural environment can change along with the variation of ambient temperature, thereby focal length variations may cause the marked change of image quality, can compensate focal length variations with the method for regulating secondary face, the radio telescope that has adopts every after a while by the good radio source focusing of signal to noise ratio, the focused restriction in source of the secondary face position of finding, Guan Ce method then, this method, sometimes do not have suitable source focusing, but also lose time.
13.7m the antenna of radio telescope adopts the bigger aluminum back of the body frame of thermal expansion, belongs to the low cost antenna, is operated in the transparent radome of millimeter wave, radome is not heat insulation.The radio telescope antenna operates in the high altitude localities of height above sea level 3200m, and circumstance of temperature difference is up to 25 ℃ round the clock.Telescope moves under the natural environment of day and night temperature vary within wide limits, and and there is the temperature difference everywhere in the temperature of aerial panel and back of the body frame with variation of ambient temperature, and the antenna thermal deformation is serious, and focal length variations is even more serious.Existing telescope temperature control device operating cost costliness, and can't satisfy temperature requirements.
Summary of the invention
The objective of the invention is to overcome existing aerial panel with temperature deformation, cause focal length variations, antenna efficiency changes, the flow in object of observation source or the data precision of intensity descend, the defective that the focal length variable quantity is difficult to determine under the conventional situation provides a kind of pair surface self-adaption focusing method for radio telescope.
The technical scheme that realizes the object of the invention is: pair surface self-adaption focusing method for radio telescope comprises the following steps:
1, mounting temperature sensor on aerial panel and back of the body frame;
2, carry out secondary face with astronomical technique and vertically focus, record often comprise one take turns focusing amount that focusing simulates, each take turns in the focusing information of temperature value of time, aerial position, each temperature sensor of source strength maximum corresponding points observation;
3, according to above-mentioned focusing recorded information, analyze the rule of the temperature difference between focusing amount and temperature and panel and back of the body frame, draw the relation between the mean temperature difference (the panel mean temperature subtracts back of the body frame mean temperature) between focusing amount and panel and the back of the body frame;
4, the secondary face control program relation of utilizing step 3 to draw is carried out self-adapting focusing: the temperature difference of measuring according to temperature sensor, calculate secondary face focusing amount in real time according to the relation between the temperature difference between focusing amount and panel and the back of the body frame, revise secondary face in real time, make secondary face be in the suitable position of focal length.
The vertical focus adjustment method of secondary face in the above-mentioned steps 2 specifically comprises: secondary face is on the basis of ACTIVE CONTROL (being gravity deformation Correction and Control), the Z direction (near or away from the interarea direction) the secondary face of translation, moving step length is about 1/4l (l is the telescope operation wavelength), moving range is ± 2l about, every movement once all the point source (planet or spectral line point source) good to certain signal to noise ratio observe, the position of each secondary face correspondence obtains the intensity in a source, secondary face position when finding source strength maximum, after this near this pair face position, focus, when observed strength drops to peaked 70% left and right sides of source strength, focusing is in the other direction regulated so repeatedly again.It is big that the focusing time preferably is chosen in temperature difference span, carries out in the time of fine, and focusing need continually be done one round the clock even the longer time.
The invention has the beneficial effects as follows that by the focusing of secondary face, the observed strength in source is no longer with difference variation, the linear variation of the relation of intensity and pitching; There is linear relationship in the temperature difference that draws between focusing amount heel plate and the back of the body frame, and strength stability improves behind the self-adapting focusing, and observed strength improves than before using, and the zenith direction antenna efficiency has improved 15% than originally.
Description of drawings
Fig. 1 is the temperature sensor schematic diagram that panel and the back of the body are installed on the frame in the embodiment of the invention 1
The graph of a relation of Fig. 2 embodiment of the invention 1 focusing amount and the temperature difference
Embodiment
Describe below in conjunction with drawings and Examples.
Embodiment 1
Pair surface self-adaption focusing method for radio telescope comprises the following steps:
(1) mounting temperature sensor on the antenna
Below aerial panel, back of the body frame both sides up and down, install temperature sensor, the temperature sensor installation site should evenly distribute, temperature sensor is selected the TDC temperature sensor for use among the present invention.The installation site as shown in Figure 1, panel and back of the body frame temperature sensor distribution map, 3 transducers in each position lay respectively at panel, back of the body frame top, back of the body frame bottom.
(2) carrying out secondary face with astronomical technique vertically focuses:
Secondary face is on the basis of ACTIVE CONTROL (being gravity deformation Correction and Control), the Z direction (near or away from the interarea direction) the secondary face of translation, moving step length is about 1/4l, moving range is ± 2l about, every movement once all the point source (planet or spectral line point source) good to certain signal to noise ratio observe, the position of each secondary face correspondence obtains the intensity in a source, secondary face position when finding source strength maximum, after this near this pair face position, focus, when observed strength drops to peaked 70% left and right sides of source strength, focusing is in the other direction regulated so repeatedly again.Observed strength is taken turns into one from little change such process that diminishes greatly again, and the data of taking turns with conic fitting one obtain secondary face optimum position, i.e. the secondary face position of intensity maximum point correspondence, and secondary face optimum position is called the focusing amount; Record focusing amount, this take turns in time, aerial position, the temperature value of each temperature sensor of source strength maximum corresponding points observation; Because the focusing amount at different time can become, so this focusing need continually be done one round the clock even the longer time.Utilize planet VENUS, JUPITER, CO spectral line point source IRC+10216 etc. in the present embodiment, l gets 2.6mm.
(3) find out the control relation of self-adapting focusing
According to above-mentioned focusing recorded information, analyze the rule of the temperature difference between focusing amount and temperature and panel and back of the body frame, there is linear relationship in the temperature difference that draws between focusing amount heel plate and the back of the body frame, as shown in Figure 2.
(4) the secondary face control program linear relationship of utilizing step 3 to draw is done self-adapting focusing: the temperature difference of measuring according to temperature sensor, according to the linear relation between the temperature difference between focusing amount and panel and the back of the body frame, calculate secondary face focusing amount in real time, revise secondary face in real time, make secondary face be in position preferably.
After the present invention is applied to telescope observation, focus respectively with summer in the winter time, the result confirms that panel and back of the body frame mean temperature difference are the principal elements that influence the focusing amount, and is not obvious with temperature relation, and it is suitable equally that the pass that is to say the focusing amount of survey in summer and the temperature difference ties up to winter.
Claims (3)
1. pair surface self-adaption focusing method for radio telescope is characterized in that, this method comprises the following steps:
Step 1 is mounting temperature sensor on aerial panel and back of the body frame;
Step 2 is carried out secondary face with astronomical technique and is vertically focused, specifically comprise: on the basis of gravity deformation Correction and Control, near or away from the interarea direction on the secondary face of translation, moving step length is 1/4l, l is the telescope operation wavelength, moving range is ± 2l, every movement is once all observed the good point source of certain signal to noise ratio, the position of secondary face correspondence obtains the intensity in a source after every movement once, after this focus near this pair face position secondary face position when finding source strength maximum, and to drop to source strength peaked 70% the time when observed strength, focusing is in the other direction regulated so repeatedly again; Record comprise each focusing amount of taking turns focusing and simulating, each take turns in the focusing information of temperature value of time, aerial position, each temperature sensor of source strength maximum corresponding points observation;
Step 3 is analyzed the rule of the temperature difference between focusing amount and temperature and panel and back of the body frame according to above-mentioned focusing recorded information, draws the relation between the mean temperature difference between focusing amount and panel and the back of the body frame;
The relation that the secondary face control program of step 4 utilizes step 3 to draw is carried out self-adapting focusing: the temperature difference of measuring according to temperature sensor, calculate secondary face focusing amount in real time according to the relation between the temperature difference between focusing amount and panel and the back of the body frame, revise secondary face in real time, make secondary face be in the suitable position of focal length.
2. focus adjustment method according to claim 1, it is characterized in that, the mounting means of temperature sensor is in the described step 1: below the aerial panel of a mounting points, back of the body frame both sides mounting temperature sensor up and down, temperature sensor evenly distributes on aerial panel.
3. focus adjustment method according to claim 1 is characterized in that, it is big that the focusing in the step 2 is chosen in temperature difference span, carry out in the time of fine, repeatedly the duration of Tiao Jieing be at least one round the clock.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910264228 CN101771188B (en) | 2009-12-31 | 2009-12-31 | Pair surface self-adaption focusing method for radio telescope |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910264228 CN101771188B (en) | 2009-12-31 | 2009-12-31 | Pair surface self-adaption focusing method for radio telescope |
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| CN101771188A CN101771188A (en) | 2010-07-07 |
| CN101771188B true CN101771188B (en) | 2013-08-21 |
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| CN 200910264228 Expired - Fee Related CN101771188B (en) | 2009-12-31 | 2009-12-31 | Pair surface self-adaption focusing method for radio telescope |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785445B (en) * | 2016-12-05 | 2019-07-05 | 中国科学院上海天文台 | A kind of radio telescope focal length rapid correction method |
| CN110346046B (en) * | 2019-07-15 | 2020-11-06 | 中国科学院合肥物质科学研究院 | Day and night star radiometer automatic focusing method and radiometer system |
| CN113410653B (en) * | 2021-06-02 | 2022-10-11 | 杭州电子科技大学 | Large single-caliber radio telescope and method for improving pointing error thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001318300A (en) * | 2000-05-09 | 2001-11-16 | Canon Inc | Catoptric system for optical antenna |
| CN1455878A (en) * | 2001-01-26 | 2003-11-12 | 科宁精密透镜公司 | Lens assembly having automatic thermal focus adjustment |
| CN2783352Y (en) * | 2005-03-04 | 2006-05-24 | 中国科学院国家天文台南京天文光学技术研究所 | Sub-lens self-adaption positoing mechanism for astronmical telescope |
| CN1987547A (en) * | 2006-12-30 | 2007-06-27 | 中国科学院光电技术研究所 | Device for automatically correcting telescope aberration by using telescope secondary mirror |
-
2009
- 2009-12-31 CN CN 200910264228 patent/CN101771188B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001318300A (en) * | 2000-05-09 | 2001-11-16 | Canon Inc | Catoptric system for optical antenna |
| CN1455878A (en) * | 2001-01-26 | 2003-11-12 | 科宁精密透镜公司 | Lens assembly having automatic thermal focus adjustment |
| CN2783352Y (en) * | 2005-03-04 | 2006-05-24 | 中国科学院国家天文台南京天文光学技术研究所 | Sub-lens self-adaption positoing mechanism for astronmical telescope |
| CN1987547A (en) * | 2006-12-30 | 2007-06-27 | 中国科学院光电技术研究所 | Device for automatically correcting telescope aberration by using telescope secondary mirror |
Non-Patent Citations (2)
| Title |
|---|
| Albert Greve etc..Improvement of the IRAM 30-m Telescope From Temperature Measurements and Finite-Element Calculations.《IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》.2005,第53卷(第2期), |
| Improvement of the IRAM 30-m Telescope From Temperature Measurements and Finite-Element Calculations;Albert Greve etc.;《IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》;20050228;第53卷(第2期);851-860 * |
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