CN100381788C - High precision low cost starlight simulator - Google Patents
High precision low cost starlight simulator Download PDFInfo
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- CN100381788C CN100381788C CNB2006101125279A CN200610112527A CN100381788C CN 100381788 C CN100381788 C CN 100381788C CN B2006101125279 A CNB2006101125279 A CN B2006101125279A CN 200610112527 A CN200610112527 A CN 200610112527A CN 100381788 C CN100381788 C CN 100381788C
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- starlight
- parallel light
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Abstract
A starlight simulator with high accuracy consists of light source system formed by concave lens and surface light source, star atlas analog computer being set with star atlas analog algorithm and basic star table for calculating out mapping positions of each navigation star on liquid crystal display system, frequency divider for dividing said mapping positions to different units, display unit for carrying out directly viewing display, liquid crystal display system for displaying distribution of fixed star, parallel light tube being used to set liquid crystal display system on its focal plane and being used to simulate parallel star light of infinite truly under specific visual field and shaft.
Description
Technical field
The present invention relates to a kind of high precision low cost starlight simulator, be applicable to the theoretical method of celestial navigation system and the performance verification of engineering application technical research and star sensor.
Background technology
Along with reaching its maturity of autonomous astronomical navigation technology, surveying the high star sensor of appearance precision gains great popularity, it can responsive celestial sphere on the fixed star star chart of diverse location, discern fixed star in the responsive star chart by star Pattern Recognition Algorithm, and utilize star place to determine the attitude of aircraft.But to the performance test of star sensor and the software test of star Pattern Recognition Algorithm, because the space flight experimental expenses is big, often can not carry out real-time starry sky takes, therefore be check star Pattern Recognition Algorithm and star sensor performance, usually adopt starlight analog device, simulate starry sky on the ground by the computer simulation technology.At present, aspect the development of starlight analog device, mainly concentrate on precision, speed and the cost of starlight analog device both at home and abroad.Comparatively ripe in this regard abroad, general main utilization is based on the nautical star choosing method of starlight angular distance, realize high-precision starlight simulation by expensive high precision, high-resolution liquid crystal light valve and computer hardware technique, but, there is the shortcoming that the starlight analog rate is slow, price is high owing to adopt the starlight angular distance to select star and liquid crystal light valve simulation.Domestic, at present existing how tame unit starts to walk aspect development early, but with still having gap abroad; They finish the starlight simulation mostly from the external liquid crystal light valve of introducing costliness, and also some unit directly utilizes notebook simulation star chart.In a word, present both at home and abroad more complete starlight analog device on performance and price not also the present invention is directed to this and has proposed a kind of high precision fast, starlight analog device cheaply.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiency of existing starlight analog device at aspects such as starlight accuracy of simulation, speed and costs, make up a kind of precision height, speed is fast, cost is low starlight analog device.
Technical solution of the present invention is: a kind of high precision low cost starlight simulator, form by star image simulation computing machine, frequency divider, display device, light-source system, liquid crystal display systems, parallel light tube, wherein light-source system mainly is made up of concavees lens and area source, and the star image simulation computing machine is equipped with star image simulation algorithm and fundamental catalog; Star image simulation computing machine employing star image simulation algorithm retrieves all nautical stars under the specific optical axis and the visual field from fundamental catalog, according to the coordinate conversion principle, calculate the mapping position of every nautical star at liquid crystal display systems, outputing to display device by a frequency divider part more intuitively shows, another part is under the area source effect of light-source system, the distribution situation that in liquid crystal display systems, shows fixed star with certain celestial body size and gray shade scale, the display board of liquid crystal display systems is placed on the focal plane of parallel light tube, can simulate the parallel starlight of infinite distant place under specific visual field and the optical axis so truly.
The star image simulation algorithm that the star image simulation computing machine is packed into comprises that the rapid navigation star chooses algorithm, coordinate transferring and display module, and it has static star image simulation and dynamic star image simulation function; The static simulation function can be set right ascension, the declination value of simulation day district center, and optical axis can be arranged to the shake mode, and the scope of optical jitter is according to the situation setting of aircraft roll angle; The dynamic similation function need import the track data of aircraft operation, and the magnitude value of retrieval nautical star in the field range, star gray-scale value, celestial body size, visual field rotation angle, fundamental catalog of star image simulation speed, star image simulation device etc. can be set.
The rapid navigation star is chosen algorithm and is adopted how much and projection theory, declination value according to the current optical axis, in conjunction with the size of visual field, the method for utilizing cross section circle and fixed area to find the solution the right ascension span determines to choose the nautical star condition, thereby finishes fast selecting nautical star from fundamental catalog.The specific implementation step of utilizing cross section circle and fixed area to find the solution right ascension span method is: establishing parallel light tube (6) visual field is FOV
x* FOV
y, by its wide W of being that sees the region S on the celestial sphere, height is H, the current optical axis is oriented to (α
h, δ
0), declination equals δ
0The parallel of declination be called cross section circle, (90 °-δ of cross section radius of a circle r=Rsin
0), wherein R is the radius of celestial sphere, is designated as unit length during actual computation, perimeter L=2 π * r=2 π * Rcos (δ of cross section circle
0), the i.e. right ascension span R under this declination of the arc length of cross section that region S covers circle then
gFor:
Fundamental catalog can adopt Tycho2 fundamental catalog, J2000 fundamental catalog or SAO fundamental catalog; For improving retrieval rate, wherein the stellar magnitude of fundamental catalog is bright in seven stars such as grade, and the positional information of these fixed stars reaches 0.1 rad of (3 σ) precision through accurate the correction.
Liquid crystal display systems is made up of low cost, high-resolution LCD panel and corresponding driving circuit, LCD panel is installed on the focal plane of parallel light tube, the out of focus of doing is to a certain degree handled, realize that effective starlight simulation shows, the core component of driving circuit adopts FPGA, characteristics such as utilize FPGA to carry out the efficient height, to drive LCD panel simple and convenient, and access video data speed is fast realize fixed star space distribution efficiently on display board; The display surface of LCD panel parallels with the face of the area source of light-source system, and the optical axis of same parallel light tube (6) is perpendicular; Parallel light tube (6) adopts little distortion, flattened field, apochromatic image device; Its optical system surface has been plated high-quality anti-reflection film, having done strong preventing stray light in the light path handles, the medial surface blacking of parallel light tube (6) and flocking hair strengthen the ability that absorbs parasitic light simultaneously, have avoided directional light to produce veiling glare through the reflection of parallel light tube (6) medial surface; The display surface of the optical axis vertical liquid crystal display board of parallel light tube (6), and its display surface center of mistake.
Principle of the present invention is: utilize the star image simulation algorithm in the star image simulation computing machine (1), retrieve all nautical stars under the specific optical axis and the visual field from fundamental catalog, according to the coordinate conversion principle, calculate the mapping position of every nautical star at liquid crystal display systems; Outputing to display device by a frequency divider part intuitively shows, another part is under the area source effect of light-source system, the distribution situation that in liquid crystal display systems, shows fixed star with certain celestial body size and gray shade scale, the display board of liquid crystal display systems is placed on the focal plane of parallel light tube, can simulate the parallel starlight of infinite distant place under specific visual field and the optical axis so truly.
The present invention's advantage compared with prior art is: it is simple to have kept traditional starlight analog device, be easy to the advantage of parameter setting, optimization and Project Realization, overcome simultaneously the shortcoming that traditional starlight analog device simulation precision is lower, speed is slow and cost is high again, made up a kind of precision height, cost is low and analog rate is fast starlight analog device, it has following advantage: the high precision star image simulation algorithm in (1) star image simulation computing machine has the high-precision analog of static star chart and the dynamic high-precision analog function of star chart; (2) the rapid navigation star is chosen algorithm and is adopted geometry and projection theory, and the method for utilizing cross section circle and fixed area to find the solution the right ascension span determines to choose the nautical star condition, and without starlight angular distance information, this can improve the speed of starlight simulation greatly; (3) liquid crystal display systems is made up of low cost, high-resolution LCD panel and corresponding driving circuit, LCD panel is installed on the focal plane of parallel light tube, the out of focus of doing is to a certain degree handled, and realizes that the simulation of effective high-precision starlight shows, greatly reduces cost simultaneously; (4) parallel light tube adopts little distortion, flattened field, apochromatic image device; Its optical system surface has been plated high-quality anti-reflection film, has done strong preventing stray light in the light path and has handled, and the medial surface blacking of parallel light tube and flocking hair strengthen the ability that absorbs parasitic light simultaneously, has avoided directional light to produce veiling glare through the reflection of parallel light tube medial surface; The display surface of the optical axis vertical liquid crystal display board of parallel light tube, and its display surface center of mistake.
Description of drawings
Fig. 1 is structural framing figure of the present invention;
Fig. 2 is the star image simulation algorithm flow chart among the present invention;
Fig. 3 carries out the process flow diagram that nautical star is chosen for a kind of among the present invention utilizes cross section circle and fixed area to find the solution the right ascension span;
Fig. 4 produces the directional light schematic diagram for a kind of parallel light tube among the present invention;
Fig. 5 is the installation diagram of light-source system, LCD panel and parallel light tube among the present invention.
Embodiment
As shown in Figure 1, the present invention includes star image simulation computing machine 1, frequency divider 2, display device 3, light-source system 4, liquid crystal display systems 5, parallel light tube 6, wherein light-source system 4 is made up of concavees lens and area source; Star image simulation computing machine 1 is equipped with star image simulation algorithm 11 and fundamental catalog 12; Star image simulation computing machine 1 adopts star image simulation algorithm 11, retrieves all nautical stars under the specific optical axis and the visual field from fundamental catalog 12, according to the coordinate conversion principle, calculates the mapping position of every nautical star at liquid crystal display systems 5; By frequency divider 2, a part outputs to display device 3 and intuitively shows, another part shows the distribution situation of fixed star in liquid crystal display systems 5 with certain celestial body size and gray shade scale under the area source effect of light-source system 4; The display board of liquid crystal display systems 5 is placed on the focal plane of parallel light tube 6, can simulate the parallel starlight of infinite distant place under specific visual field and the optical axis so truly.
As shown in Figure 2, star image simulation algorithm 11 flow processs of the present invention are: carry out the setting of the aircraft cycle of operation behind the algorithm initialization, judge whether to carry out dynamic similation, then directly carry out the rapid navigation star in this way and choose, be provided with otherwise carry out the visual field size; Set the rotation angle of liquid crystal display systems 5, and the right ascension and the declination of input day district center, after carry out the rapid navigation star and choose, finish the output of result for retrieval in conjunction with fundamental catalog 12; With output information according to principle of coordinate transformation, solve the mapping position of every nautical star on display plane, the celestial body display properties can carry out the validity setting; Judge whether to finish simulation afterwards, as finish then algorithm end, otherwise turn back to the setting of the aircraft cycle of operation, carry out next round-robin simulation.
As shown in Figure 3, nautical star fast selecting algorithm among the present invention adopts how much and projection theory, declination value according to the current optical axis, size in conjunction with the visual field, the method of utilizing cross section circle and fixed area to find the solution the right ascension span determines to choose the nautical star condition, thereby finishes fast selecting nautical star from fundamental catalog 12.Specific implementation is: the visual field of establishing parallel light tube 6 is FOV
x* FOV
y, by its wide W of being that sees the region S on the celestial sphere, height is H, the current optical axis is oriented to (α
h, δ
0), declination equals δ
0The parallel of declination be called cross section circle, (90 °-δ of cross section radius of a circle r=Rsin
0), wherein R is the radius of celestial sphere, is designated as unit length during actual computation, perimeter L=2 π * r=2 π * Rcos (δ of cross section circle
0), the i.e. right ascension span R under this declination of the arc length of cross section that region S covers circle then
gFor:
After the right ascension span is found the solution out, can carry out choosing of nautical star: establishing optical axis direction is (α
0, δ
0), according to declination δ
0The right ascension span of determining by said method is R
g, then observe the choosing method of star as follows: to suppose that the right ascension of a certain fixed star, declination value are that (α δ), then needs only α, and the δ value meets the following conditions, and just it can be elected as the observation star.
Can finish the fast selecting of nautical star according to top formula.
As shown in Figure 4, liquid crystal display systems 5 of the present invention is made up of low cost, high-resolution LCD panel and corresponding driving plate, LCD panel is installed on the focal plane of parallel light tube 6, the out of focus of doing is to a certain degree handled, realize that the simulation of effective starlight shows that the core component of driving circuit adopts FPGA, utilize FPGA to carry out the efficient height, to drive LCD panel simple and convenient, characteristics such as access video data speed is fast realize fixed star space distribution efficiently on display board; The display surface of LCD panel parallels with the face of the area source of light-source system 5, and is perpendicular with the optical axis of parallel light tube 6.According to optical principle, the LCD panel of simulation star chart is placed on the focal plane 61 of camera lens, each luminous point on the light source (as the A point) produces one group of directional light 62 with scioptics, and the parallel direction of light of this group all is parallel to the light 63 by this luminous point and optical center.
As shown in Figure 5, the installation of light-source system 4 of the present invention, LCD panel and parallel light tube 6, the face that requires light-source system 4 area sources parallels with the display surface of LCD panel, vertical these two faces of the optical axis of parallel light tube 6, and the center of these two faces of mistake; The present invention is subjected to light even in order to make LCD panel, at the front end of area source concavees lens is installed, and area source is placed on the focal plane of concavees lens, and B is the focus of concavees lens; The height h of concavees lens is consistent with the effective display surface on the LCD panel, when simulating according to starlight apart from d desired simulation the energy of dark fixed star determine.
The content that is not described in detail in the instructions of the present invention belongs to this area professional and technical personnel's known prior art.
Claims (3)
1. high precision low cost starlight simulator, it is characterized in that: comprise star image simulation computing machine (1), frequency divider (2), display device (3), light-source system (4), liquid crystal display systems (5), parallel light tube (6), star image simulation algorithm (11) and fundamental catalog (12) are housed in the star image simulation computing machine (1), and wherein liquid crystal display systems is made up of low cost, high-resolution LCD panel and corresponding driving circuit; Star image simulation algorithm (11) comprises that the rapid navigation star chooses algorithm, coordinate transferring and display module, it utilizes the rapid navigation star to choose algorithm and retrieve all nautical stars under the current optical axis and the visual field fast from fundamental catalog (12), according to the coordinate conversion principle, calculate the mapping position of every nautical star by coordinate transferring in liquid crystal display systems (5), pass through display module again, utilize frequency divider (a 2) part to output to display device (3) demonstration directly perceived, another part is under light-source system (4) effect, the distribution situation that in liquid crystal display systems (5), shows fixed star with certain celestial body size and gray shade scale, the display board of liquid crystal display systems (5) is placed on the focal plane of parallel light tube (6), can simulate the parallel starlight of infinite distant place under specific visual field and the optical axis truly; Described rapid navigation star is chosen algorithm and is adopted how much and projection theory, declination value according to the current optical axis, in conjunction with the size of visual field, the method for utilizing cross section circle and fixed area to find the solution the right ascension span determines to choose the nautical star condition, thereby finishes fast selecting nautical star from fundamental catalog (12); Parallel light tube (6) adopts little distortion, flattened field, apochromatic image device; Its optical system surface has been plated high-quality anti-reflection film, has done strong preventing stray light in the light path and has handled, and the medial surface blacking of parallel light tube (6) and flocking hair strengthen the ability that absorbs parasitic light simultaneously; The display surface of the optical axis vertical liquid crystal display board of described parallel light tube (6), and its display surface center of mistake.
2. high precision low cost starlight simulator according to claim 1 is characterized in that: describedly utilize cross section circle and fixed area to find the solution right ascension span method to be: the visual field of establishing parallel light tube (6) is FOV
x* FOV
y, by its wide W of being that sees the region S on the celestial sphere, height is H, the current optical axis is oriented to (α
h, δ
0), declination equals δ
0The parallel of declination be called cross section circle, (90 °-δ of cross section radius of a circle r=Rsin
0), wherein R is the radius of celestial sphere, is designated as unit length during actual computation, perimeter L=2 π * r=2 π * Rcos (δ of cross section circle
0), the i.e. right ascension span R under this declination of the arc length of cross section that region S covers circle then
gFor:
3. low cost starlight simulator according to claim 1, it is characterized in that: described fundamental catalog (12) adopts Tych02 fundamental catalog or J2000 fundamental catalog or SAO fundamental catalog, wherein the stellar magnitude of fundamental catalog is bright in seven stars such as grade, and the positional information of these fixed stars reaches 0.1 rad of precision through accurate the correction.
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| CNB2006101125279A CN100381788C (en) | 2006-08-23 | 2006-08-23 | High precision low cost starlight simulator |
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|---|---|---|---|
| CNB2006101125279A CN100381788C (en) | 2006-08-23 | 2006-08-23 | High precision low cost starlight simulator |
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| CN1912547A CN1912547A (en) | 2007-02-14 |
| CN100381788C true CN100381788C (en) | 2008-04-16 |
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| CN102175262B (en) * | 2011-01-13 | 2012-08-22 | 哈尔滨工业大学 | Dynamic multi-star star chart simulator based on digital micromirror device (DMD) and simulation method thereof |
| CN102745345B (en) * | 2011-04-20 | 2015-02-11 | 北京控制工程研究所 | Ultraviolet fixed star simulator for calibrating ultraviolet navigation sensor |
| CN103234552A (en) * | 2013-03-29 | 2013-08-07 | 南京航空航天大学 | Optical navigation target satellite analog simulation image generating method |
| CN103604443B (en) * | 2013-11-14 | 2016-06-22 | 清华大学 | Starlight analog device |
| CN104392014B (en) * | 2014-07-31 | 2017-07-25 | 长春理工大学 | A kind of Dynamic Star simulator and its star chart modification method |
| CN104290931B (en) * | 2014-09-17 | 2018-07-20 | 长春理工大学 | A kind of ultraviolet fixed star earth simulator for earth |
| CN105045030A (en) * | 2015-07-07 | 2015-11-11 | 中国空间技术研究院 | Optical axis jitter measurement method for space optical camera and device |
| JP6433398B2 (en) * | 2015-09-25 | 2018-12-05 | ウシオ電機株式会社 | Optical measuring instrument |
| CN105606388B (en) * | 2016-02-14 | 2018-05-08 | 长春理工大学 | The variable static star simulator of the split type magnitude with sky background is adjustable star chart |
| CN106441374B (en) * | 2016-12-15 | 2019-10-29 | 北京仿真中心 | A kind of real-time semi-physical emulation whole day area Star navigation system simulator |
| CN109764892B (en) * | 2018-12-30 | 2022-06-17 | 华中光电技术研究所（中国船舶重工集团有限公司第七一七研究所） | Calibration method for near-infrared satellites and the like |
| CN112697136B (en) * | 2020-11-26 | 2023-12-05 | 北京机电工程研究所 | Quick minimum area star map simulation method |
| CN113720352B (en) * | 2021-08-31 | 2023-12-15 | 北京航空航天大学 | Star map simulation method with Mongolian gas difference effect |
| CN113970327B (en) * | 2021-11-01 | 2022-09-13 | 北京微纳星空科技有限公司 | Electronic star map simulator, electronic simulation star map generation method and electronic equipment |
| CN114633906B (en) * | 2022-04-12 | 2023-12-22 | 中国科学院光电技术研究所 | Ultraviolet dynamic earth simulator |
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