CN105185221B - A kind of celestial sphere mapping method and device - Google Patents
A kind of celestial sphere mapping method and device Download PDFInfo
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- CN105185221B CN105185221B CN201510492811.2A CN201510492811A CN105185221B CN 105185221 B CN105185221 B CN 105185221B CN 201510492811 A CN201510492811 A CN 201510492811A CN 105185221 B CN105185221 B CN 105185221B
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Abstract
The present invention, which provides a kind of celestial sphere mapping method and device, this method, to be included：Celestial body and the distance of observer are calculated in real time；Mapping distance of the celestial body on dynamic celestial sphere is determined according to the distance of celestial body and observer；The centre of sphere of the dynamic celestial sphere is observer, and the external diameter of the dynamic celestial sphere is the maximum distance specified, and the internal diameter of the dynamic celestial sphere is the minimum distance specified；Mapping point of the celestial body on dynamic celestial sphere is determined according to mapping distance of the celestial body on dynamic celestial sphere；According to mapping point of the celestial body on dynamic celestial sphere, the celestial body is shown on the dynamic celestial sphere.Celestial body in different point of observation orientation can be shown by the inventive method, while take into account the problem of celestial body is with respect to observer's change in location.
Description
Technical field
The present invention relates to astronomical visualization technique field, more particularly to a kind of celestial sphere mapping method and device.
Background technology
Astronomical science simulation algorithm is used for calculating the position of various celestial bodies, and is shown in the same coordinate system of three dimensions
In.But in astronomical visualization field, often it is related to the celestial body of various overlength distances.Overlength distance is one relative general
Read, refer to the distance beyond current coordinate system range scale.In astronomical measurement unit, the astronomical unit of 1 light-year=63239.8=
9.4605536 × 10^12 kilometers.When interplanetary space is using astronomical unit as measurement unit, then it is super long distance to count outside light-year
From；And in terrestrial space, during using kilometer as measurement unit, several astronomical units fall within overlength distance.When being related to super long distance
From astronomical yardstick when, astronomical science simulation algorithm can not be or even some in visualization process by the way of directly positioning
The astronomical yardstick of overlength distance can exceed the number range of most of three-dimensional software, it is therefore desirable to which a kind of new algorithm carries out more smart
True simulation.
Most astronomical softwares are mainly to see based on star function, therefore only need to be according to the static visual angle of earth position
Celestial body is mapped on a static celestial sphere.Therefore a kind of static celestial sphere mapping method is proposed, it has main steps that and first calculated
Actual three-dimensional coordinate of the celestial body using the earth as coordinate origin, calculates its azimuth and elevation angle, further according to spherical astronomy
Algorithm is learned to map that on the celestial sphere of radii fixus.Static celestial sphere mapping algorithm restricted application, it is only used for showing the earth
Neighbouring static starry sky, observer and fixed star are not all subjected to displacement.Therefore the starry sky in remaining point of observation orientation can not be shown,
The problem of celestial body is with respect to observer's change in location during space flight can not be taken into account.
The content of the invention
The embodiments of the invention provide a kind of celestial sphere mapping method, can show the celestial body in different point of observation orientation, together
When take into account the problem of celestial body is with respect to observer's change in location.This method includes：
Celestial body and the distance of observer are calculated in real time；
Mapping distance of the celestial body on dynamic celestial sphere is determined according to the distance of celestial body and observer；The ball of the dynamic celestial sphere
The heart is observer, and the external diameter of the dynamic celestial sphere is the maximum distance specified, the internal diameter of the dynamic celestial sphere be specify it is nearest
Distance；
Mapping point of the celestial body on dynamic celestial sphere is determined according to mapping distance of the celestial body on dynamic celestial sphere；
According to mapping point of the celestial body on dynamic celestial sphere, the celestial body is shown on the dynamic celestial sphere.
In one embodiment, in addition to：
According to the absolute magnitude of celestial body, the apparent magnitude of the celestial body with respect to observer current location is calculated；
Brightness and the size of the celestial body are determined according to the apparent magnitude；
Brightness and the size of the celestial body are shown on the dynamic celestial sphere.
In one embodiment, calculate in real time celestial body and observer apart from when, by the celestial body and the distance of observer
It is transformed to index expression-form.
In one embodiment, the distance according to celestial body and observer determine mapping of the celestial body on dynamic celestial sphere away from
From, including：
When the distance of celestial body and observer be more than specify maximum distance when, mapping of the celestial body on dynamic celestial sphere away from
From for maximum distance；When the distance of celestial body and observer are less than the minimum distance specified, the celestial body is on dynamic celestial sphere
Mapping distance is actual range；When the distance of celestial body and observer are between specified maximum distance and the minimum distance specified
When, mapping distance of the celestial body on dynamic celestial sphere is calculated according to interpolation algorithm.
In one embodiment, it is described to determine celestial body in dynamic day according to mapping distance of the celestial body on dynamic celestial sphere
Mapping point on ball, including：
According to the algorithm of spheric coordinate system, by the actual three-dimensional coordinate of celestial body, the celestial body is calculated relative to observer's
Azimuth and elevation angle；
According to mapping distance of the celestial body on dynamic celestial sphere, and the azimuth being calculated and elevation angle, really
Fixed mapping point of the celestial body on dynamic celestial sphere.
In one embodiment, the absolute magnitude according to celestial body, celestial body regarding with respect to observer current location is calculated
Magnitude, specifically calculated according to equation below：
M=M-5.0*log10 (32.616/D)；
Wherein, m is the apparent magnitude；
M is absolute magnitude；
D is celestial body and the distance of observer.
The embodiment of the present invention additionally provides a kind of celestial sphere mapping device, can show the celestial body in different point of observation orientation,
Take into account the problem of celestial body is with respect to observer's change in location simultaneously.The device includes：
Distance between celestial bodies determining module, for calculating celestial body and the distance of observer in real time；
Mapping distance determining module, for determining mapping of the celestial body on dynamic celestial sphere according to the distance of celestial body and observer
Distance；The centre of sphere of the dynamic celestial sphere is observer, and the external diameter of the dynamic celestial sphere is the maximum distance specified, the dynamic day
The internal diameter of ball is the minimum distance specified；
Mapping point determining module, for determining celestial body in dynamic according to mapping distance of the celestial body on dynamic celestial sphere
Mapping point on celestial sphere；
Celestial body display module, for the mapping point according to celestial body on dynamic celestial sphere, shown on the dynamic celestial sphere
The celestial body.
In one embodiment, in addition to：
Apparent magnitude determining module, for the absolute magnitude according to celestial body, the celestial body is calculated with respect to observer current location
The apparent magnitude；
Brightness and size determining module, for determining brightness and the size of the celestial body according to the apparent magnitude；
Brightness and size display module, for showing brightness and the size of the celestial body on the dynamic celestial sphere
In one embodiment, calculate in real time celestial body and observer apart from when, by the celestial body and the distance of observer
It is transformed to index expression-form.
In one embodiment, the mapping distance determining module is specific as follows according to celestial body and observer
Distance determines mapping distance of the celestial body on dynamic celestial sphere：
When the distance of celestial body and observer be more than specify maximum distance when, mapping of the celestial body on dynamic celestial sphere away from
From for maximum distance；When the distance of celestial body and observer are less than the minimum distance specified, the celestial body is on dynamic celestial sphere
Mapping distance is actual range；When the distance of celestial body and observer are between specified maximum distance and the minimum distance specified
When, mapping distance of the celestial body on dynamic celestial sphere is calculated according to interpolation algorithm.
In one embodiment, the mapping point determining module is specific as follows according to the celestial body in dynamic
Mapping distance on celestial sphere determines mapping point of the celestial body on dynamic celestial sphere：
According to the algorithm of spheric coordinate system, by the actual three-dimensional coordinate of celestial body, the celestial body is calculated relative to observer's
Azimuth and elevation angle；
According to mapping distance of the celestial body on dynamic celestial sphere, and the azimuth being calculated and elevation angle, really
Fixed mapping point of the celestial body on dynamic celestial sphere.
In one embodiment, the apparent magnitude determining module specifically calculates celestial body according to equation below and worked as with respect to observer
The apparent magnitude of front position：
M=M-5.0*log10 (32.616/D)；
Wherein, m is the apparent magnitude；
M is absolute magnitude；
D is celestial body and the distance of observer.
In embodiments of the present invention, mapping of the celestial body on dynamic celestial sphere can be determined by the distance of celestial body and observer
Distance, mapping point of the celestial body on dynamic celestial sphere can be determined according to the mapping distance of celestial body, so that can according to mapping point
To show the celestial body on dynamic celestial sphere, following beneficial effect can be reached by the inventive method：Can be with dynamic celestial sphere
The celestial body in different point of observation orientation is shown, while this method can take into account the problem of celestial body is with respect to observer's change in location.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, not
Form limitation of the invention.In the accompanying drawings：
Fig. 1 is a kind of celestial sphere mapping method flow chart provided in an embodiment of the present invention；
Fig. 2 is a kind of celestial sphere mapping device structural representation provided in an embodiment of the present invention；
Fig. 3 is the effect diagram that a kind of celestial body provided in an embodiment of the present invention is mapped on dynamic celestial sphere；
Fig. 4 is that celestial body is mapped to the effect signal on dynamic celestial sphere after a kind of observer provided in an embodiment of the present invention moves
Figure.
Embodiment
It is right with reference to embodiment and accompanying drawing for the object, technical solutions and advantages of the present invention are more clearly understood
The present invention is described in further details.Here, the exemplary embodiment of the present invention and its illustrate to be used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
It is existing that celestial body is mapped to using the earth as coordinate system by static celestial sphere mapping method in astronomical visualization field
In the actual three-dimensional coordinate of origin.Static celestial sphere mapping method restricted application, it is only used for showing the static star near the earth
Sky, observer and fixed star are not all subjected to displacement.Therefore the starry sky in remaining point of observation orientation can not be shown, can not also be taken into account interspace
The problem of celestial body is with respect to observer's change in location in flight course.If it can propose that one kind can show different point of observation sides
The celestial body of position, while the celestial sphere mapping method for the problem of celestial body is with respect to observer's change in location can also be taken into account, it is possible to solve
Problems of the prior art.Based on this, the present invention proposes a kind of celestial sphere mapping method.
Fig. 1 is a kind of celestial sphere mapping method flow chart provided in an embodiment of the present invention, as shown in figure 1, this method includes：
Step 101：Celestial body and the distance of observer are calculated in real time；
Step 102：Mapping distance of the celestial body on dynamic celestial sphere is determined according to the distance of celestial body and observer；The dynamic
The centre of sphere of celestial sphere is observer, and the external diameter of the dynamic celestial sphere is the maximum distance specified, and the internal diameter of the dynamic celestial sphere is finger
Fixed minimum distance；
Step 103：Mapping of the celestial body on dynamic celestial sphere is determined according to mapping distance of the celestial body on dynamic celestial sphere
Coordinate；
Step 104：According to mapping point of the celestial body on dynamic celestial sphere, the celestial body is shown on the dynamic celestial sphere
When the inventive method is mainly that position between celestial body and observer changes, how celestial body navigated to three
In dimension space.A kind of existing method directly positioned, be related to and space flight problem, this method are direct calculating celestial bodies
Actual coordinate, celestial body is navigated in three dimensions.But this method is only capable of carrying out mould under the astronomical yardstick being more or less the same
Intend.Such as interstellar space uses light-year (LightYear), interplanetary space uses astronomical unit (AU), and satellite is then using public affairs
In (KM), these three celestial body scale differences are excessive, it is difficult to are compatible with same coordinate system.Now, remote celestial body is in video camera
Outside range of observation, nearby celestial body is then intensive is overlapped near the origin of coordinates, and three-dimensional software can not simulate the three-dimensional of such yardstick
Scene.
In addition, even with same yardstick, may be beyond the maximum (example of integer when hypertelorism between celestial body
Such as larger than 65536 light-years), or the minimum value that precision is less than floating number when indivedual distance between celestial bodies are excessively near (is, for example, less than
0.00000001 light-year), the difficulty for causing software numerical value to express.
Therefore, for problem present in the method that directly positions, by celestial body (mainly overlength distance in the inventive method
Celestial body) with the distance of observer (because continually changing when the position of celestial body and observer, referring to relative distance) with index
Form is expressed.Such as 10000 light-year can be exchanged into e^9.21034037 light-years.For the universe that the mankind have been observed that, most
Tens billion of light-years can far be reached, it is about e^24 to be converted to exponential form.If using kilometer as measurement unit, about e^54.Therefore
The measurement unit of Arbitrary Digit magnitude in current universe range scale can be expressed with limited number range.
In addition, when by the use of single-precision floating point value as index, its precision is limited, such as the index of several hundred million light-years celestial body outside
Precision is likely to be breached the error of hundreds of light-years, but when being mapped on celestial sphere, the error with respect to observer's ken is much smaller than a picture
Element, the error less than a pixel is negligible for visualization process.Such as need to improve precision, double precision can also be used
Floating number is as index.Therefore index expression-form can not only meet the requirement of finite value scope, also disclosure satisfy that super remote
Apart from the required precision of celestial body.
When it is implemented, after the distance of celestial body and observer is calculated, it is possible to according to celestial body and observer away from
From mapping distance of the celestial body on dynamic celestial sphere is determined, i.e., the distance of celestial body and observer are mapped on dynamic celestial sphere, obtained
The mapping distance of celestial body.Described dynamic celestial sphere is a virtual celestial sphere, the celestial sphere using observer as the centre of sphere, with it is specified most
The remote internal diameter for being the external diameter of celestial sphere, celestial sphere being mapped as with specified minimum distance.When the distance of celestial body and observer exceed
During maximum distance, mapping distance of the celestial body on dynamic celestial sphere is maximum distance, i.e., celestial body is directly navigated to the appearance of celestial sphere
On face；When the distance of celestial body and observer are less than minimum distance, mapping distance of the celestial body on dynamic celestial sphere is actual range,
Celestial body is placed in dynamic celestial sphere with actual coordinate；When the distance of celestial body and observer are between two distances, according to
Interpolation algorithm calculates the mapping distance of the celestial body on dynamic celestial sphere, i.e., with interpolation algorithm be located to internal diameter and external diameter it
Between relevant radii at.
Specifically, the numerical value of internal-and external diameter can specify according to the demand of scene, such as with AU (Astronomical
Unit, astronomical unit) it is in the solar system of main measurement unit, using an airship as observer, according to each celestial body and observation
The distance of person, it is distributed in three regions of celestial sphere：
Internal layer：Internal diameter may be configured as 1000 (parasangs in three-dimensional software), be mapped as 1AU minimum distance.1AU it
Outer celestial body all can be considered overlength distance celestial body, it is necessary to carry out celestial coordinate mapping.Each celestial body within 1AU is using actual
Coordinate, physical length corresponding to parasang are 1AU/1000=0.001AU, the coordinatometer as celestial body in this spatial dimension
Degree；
Outer layer：Most celestial body in solar system are all within 100AU, then the star system of distant place can be considered infinite point.
External diameter can be arranged to 1200, be mapped as 100AU maximum distance, beyond being all mapped at 1200 radiuses for this distance；
Intermediate layer：Celestial body between 1AU and 100AU then (or is selected more multiple by linear interpolation according to scene demand
Miscellaneous non-linear interpolation algorithm) obtain its distance mapped.
When it is implemented, after mapping distance of the celestial body on dynamic celestial sphere is obtained, it is also necessary to determine that celestial sphere mapping is sat
Mark, i.e. mapping point of the celestial body on dynamic celestial sphere.Mapping point of the celestial body on dynamic celestial sphere determines that method can have much
Kind, it can specifically determine with the following method：
According to the algorithm of spheric coordinate system, by the actual three-dimensional coordinate of celestial body, orientation of the celestial body relative to observer is calculated
Angle and elevation angle；
According to mapping distance (i.e. the day radius of a ball of the celestial body) of the celestial body on dynamic celestial sphere, and the day body phase being calculated
Azimuth and elevation angle for observer, determine mapping point of the celestial body on dynamic celestial sphere.
When it is implemented, after mapping point of the celestial body on dynamic celestial sphere is determined, it is possible to according to celestial body dynamic
Mapping point on state celestial sphere, the celestial body is shown on dynamic celestial sphere.Now be it is simple dynamic celestial sphere it is specific certain
Such a celestial body has been shown on individual three-dimensional coordinate, but has not shown size and the brightness of the celestial body.
When it is implemented, size and the brightness of the celestial body can also be shown on dynamic celestial sphere.Below can be according to as follows
Method determines the brightness of celestial body and size：First according to the absolute magnitude of celestial body, the celestial body is calculated with respect to observer's present bit
The apparent magnitude put, brightness and the size of celestial body are then manually set according to the apparent magnitude calculated.When the brightness that celestial body is determined
Shown with size can on dynamic celestial sphere.
Specifically, according to the absolute magnitude of celestial body, calculating of the celestial body with respect to the apparent magnitude of observer current location is calculated
Formula is：M=M-5.0*log10 (32.616/D), wherein, m is the apparent magnitude, and M is absolute magnitude (given value), D be celestial body with
The distance of observer (unit is light-year).
When observer or celestial body move, mapped by foregoing invention method per the celestial sphere of frame real-time update celestial body
Coordinate, brightness and size.
The present invention uses dynamic celestial sphere mapping algorithm, and the celestial body of a variety of measurements can be mapped to a real-time change
Celestial sphere on, when observer moves, each celestial body can carry out on celestial sphere to the actual range of observer corresponding according to it
Displacement, and its size of real-time update and brightness, so as to the accurate celestial body of simulation any distance under same coordinate system,
And the limit of size of three-dimensional software will not be surmounted.
Based on same inventive concept, a kind of dynamic celestial sphere mapping device is additionally provided in the embodiment of the present invention, as following
Described in embodiment.It is similar to dynamic celestial sphere mapping method to solve the principle of problem due to dynamic celestial sphere mapping device, therefore dynamic
The implementation of celestial sphere mapping device may refer to the implementation of dynamic celestial sphere mapping method, repeats part and repeats no more.It is following to be used
, term " unit " or " module " can realize the combination of the software and/or hardware of predetermined function.Although following examples institute
The device of description is preferably realized with software, but hardware, or the combination of software and hardware realization be also may and quilt
Conception.
Fig. 2 is the dynamic celestial sphere mapping device structural representation of the embodiment of the present invention, as shown in Fig. 2 the device includes：
Distance between celestial bodies determining module 201, for calculating celestial body and the distance of observer in real time；
Mapping distance determining module 202, for determining celestial body on dynamic celestial sphere according to the distance of celestial body and observer
Mapping distance；The centre of sphere of the dynamic celestial sphere is observer, and the external diameter of the dynamic celestial sphere is the maximum distance specified, described dynamic
The internal diameter of state celestial sphere is the minimum distance specified；
Mapping point determining module 203, for determining that celestial body exists according to mapping distance of the celestial body on dynamic celestial sphere
Mapping point on dynamic celestial sphere；
Celestial body display module 204, for the mapping point according to celestial body on dynamic celestial sphere, show on the dynamic celestial sphere
Show the celestial body.
When it is implemented, apparatus of the present invention can also include：
Apparent magnitude determining module, for the absolute magnitude according to celestial body, the celestial body is calculated with respect to observer current location
The apparent magnitude；
Brightness and size determining module, for determining brightness and the size of the celestial body according to the apparent magnitude；
Brightness and size display module, for showing brightness and the size of the celestial body on the dynamic celestial sphere.
All structures are described in detail below.
When it is implemented, the celestial body and the distance of observer that are determined by distance between celestial bodies determining module 201 reach shape with index table
Formula so that the measurement unit of Arbitrary Digit magnitude in current universe range scale can be expressed with limited number range.
When it is implemented, mapping distance determining module 202 specifically can be as follows according to celestial body and observer
Distance determines mapping distance of the celestial body on dynamic celestial sphere：
When the distance of celestial body and observer exceed maximum distance, mapping distance of the celestial body on dynamic celestial sphere is most long distance
From directly celestial body is navigated on the outer surface of celestial sphere；When the distance of celestial body and observer are less than minimum distance, celestial body exists
Mapping distance on dynamic celestial sphere is actual range, i.e., celestial body is placed in dynamic celestial sphere with actual coordinate；When celestial body and observation
When the distance of person is between two distances, mapping distance of the celestial body on dynamic celestial sphere is calculated according to interpolation algorithm, i.e.,
It is located to interpolation algorithm at the relevant radii between internal diameter and external diameter.
When it is implemented, mapping point determining module 203 specifically can be as follows according to the celestial body in dynamic
Mapping distance on celestial sphere determines mapping point of the celestial body on dynamic celestial sphere：
According to the algorithm of spheric coordinate system, by the actual three-dimensional coordinate of celestial body, the celestial body is calculated relative to observer's
Azimuth and elevation angle；
According to mapping distance of the celestial body on dynamic celestial sphere, and the azimuth being calculated and elevation angle, really
Fixed mapping point of the celestial body on dynamic celestial sphere.
When it is implemented, apparent magnitude determining module can specifically calculate celestial body with respect to observer's present bit according to equation below
The apparent magnitude put：
M=M-5.0*log10 (32.616/D)；
Wherein, m is the apparent magnitude；
M is absolute magnitude；
D is celestial body and the distance of observer.
Below by taking Maya softwares as an example, illustrate the embodiment of the inventive method：
(1) observer's video camera is created first in Maya, then creates the particle cluster for including thousands of particles, each
Particle represents a fixed star.Hipparcos catalogue is read, fixed star data are assigned to particle, key data includes：Right ascension, declination,
Distance, absolute magnitude；
(2) according to above dynamic celestial sphere mapping algorithm Expression formula, calculating fixed star in present position is current according to the observation
Azimuth, elevation angle, distance, the dynamic value of the apparent magnitude；
(3) Expression formula is assigned to particle：When observer moves in space, particle will be controlled by expression formula, root
Its coordinate, brightness and size are dynamically updated on celestial sphere according to the distance of itself and observer, obtains accurate analog result.
More than 8000 bright star in hipparcos catalogue is mapped on virtual dynamic celestial sphere proposed by the present invention, fixed star is distributed in
In the vast space do not waited away from earth number light-year to hundreds thousand of light-years.The particle coordinate of fixed star is mapped on celestial sphere, and middle part is indistinct
The endless belt of a visible comparatively dense is the milky way, as shown in Figure 3.As observer, forward bearing moves on to during space flight
When outside hundreds of light-years, most of fixed star observed persons throw behind, and particle substantially concentrates on observer rear on celestial sphere, and sees
Fixed star in front of the person of examining is also obvious sparse, and fixed star overall distribution has also no longer been starry sky known to us, as shown in Figure 4.
(note：This example is only that geocentrical more than 8000 fixed stars are demonstrated, so as to difference before and after comparison.In fact flight course
In still unobservable fixed star on current Earth can also continuously emerge, therefore actual space flight process is not in some direction
Obvious sparse situation, will simulate the real situation that is more nearly, the calculating at least needing hundreds thousand of particles and stronger is set
It is standby.)
Whole simulation process for the observer of the centre of sphere just as placing oneself in the midst of real interstellar space, each particle regarding
Correct position is presented in feel, the position of all particles is all limited in a celestial sphere model centered on observer in fact
Within enclosing.
By index mapping, observer is only shifted individual unit about more than ten in three dimensions, and no longer by huge day
Literary yardstick limitation.Observer visual angle in translation motion is rendered to come frame by frame, you can obtain accurate and true to nature interspace shuttle
Effect.
In summary, present invention improves over traditional static celestial sphere mapping algorithm, create one have apart from level, can be anti-
Reflect celestial body distant relationships, the dynamic celestial sphere that can dynamically update, and by kilometer (KM), light second (LightSecond), light-year
Etc. (LightYear) the great parasang of different scale is unified in the coordinate system of a three-dimensional scenic, can be used in theory
One celestial sphere simulates almost limitless big cosmic space in limited three dimensions, can be with the interspace of seamless simulation overlength distance
Flight course, and the science of energy strict guarantee data, the expressive force of astronomical visualization and astronomical class film can be greatly promoted.
Obviously, those skilled in the art should be understood that each module of the above-mentioned embodiment of the present invention or each step can be with
Realized with general computing device, they can be concentrated on single computing device, or are distributed in multiple computing devices
On the network formed, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to by it
Store and performed in the storage device by computing device, and in some cases, can be to be held different from order herein
They, are either fabricated to each integrated circuit modules or will be multiple in them by the shown or described step of row respectively
Module or step are fabricated to single integrated circuit module to realize.So, the embodiment of the present invention is not restricted to any specific hard
Part and software combine.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the embodiment of the present invention can have various modifications and variations.Within the spirit and principles of the invention, made
Any modification, equivalent substitution and improvements etc., should be included in the scope of the protection.
Claims (8)
- A kind of 1. celestial sphere mapping method, it is characterised in that including：Celestial body and the distance of observer are calculated in real time；Mapping distance of the celestial body on dynamic celestial sphere is determined according to the distance of celestial body and observer；The centre of sphere of the dynamic celestial sphere is Observer, the external diameter of the dynamic celestial sphere are the maximum distance specified, and the internal diameter of the dynamic celestial sphere is the minimum distance specified；Mapping point of the celestial body on dynamic celestial sphere is determined according to mapping distance of the celestial body on dynamic celestial sphere；According to mapping point of the celestial body on dynamic celestial sphere, the celestial body is shown on the dynamic celestial sphere；The distance according to celestial body and observer determines mapping distance of the celestial body on dynamic celestial sphere, including：When the distance of celestial body and observer are more than the maximum distance specified, mapping distance of the celestial body on dynamic celestial sphere is Maximum distance；When the distance of celestial body and observer are less than the minimum distance specified, mapping of the celestial body on dynamic celestial sphere Distance is actual range；When the distance of celestial body and observer are between specified maximum distance and the minimum distance specified, Mapping distance of the celestial body on dynamic celestial sphere is calculated according to interpolation algorithm；It is described that mapping point of the celestial body on dynamic celestial sphere is determined according to mapping distance of the celestial body on dynamic celestial sphere, bag Include：According to the algorithm of spheric coordinate system, by the actual three-dimensional coordinate of celestial body, orientation of the celestial body relative to observer is calculated Angle and elevation angle；According to mapping distance of the celestial body on dynamic celestial sphere, and the azimuth being calculated and elevation angle, institute is determined State mapping point of the celestial body on dynamic celestial sphere.
- 2. celestial sphere mapping method as claimed in claim 1, it is characterised in that also include：According to the absolute magnitude of celestial body, the apparent magnitude of the celestial body with respect to observer current location is calculated；Brightness and the size of the celestial body are determined according to the apparent magnitude；Brightness and the size of the celestial body are shown on the dynamic celestial sphere.
- 3. celestial sphere mapping method as claimed in claim 1, it is characterised in that calculate in real time celestial body and observer apart from when, It is index expression-form by the range conversion of the celestial body and observer.
- 4. celestial sphere mapping method as claimed in claim 2, the absolute magnitude according to celestial body, celestial body is calculated with respect to observer The apparent magnitude of current location, is specifically calculated according to equation below：M=M-5.0*log10 (32.616/D)；Wherein, m is the apparent magnitude；M is absolute magnitude；D is celestial body and the distance of observer.
- A kind of 5. celestial sphere mapping device, it is characterised in that including：Distance between celestial bodies determining module, for calculating celestial body and the distance of observer in real time；Mapping distance determining module, for according to the distance of celestial body and observer determine mapping of the celestial body on dynamic celestial sphere away from From；The centre of sphere of the dynamic celestial sphere is observer, and the external diameter of the dynamic celestial sphere is the maximum distance specified, the dynamic celestial sphere Internal diameter be the minimum distance specified；Mapping point determining module, for determining celestial body in dynamic celestial sphere according to mapping distance of the celestial body on dynamic celestial sphere On mapping point；Celestial body display module, for the mapping point according to celestial body on dynamic celestial sphere, on the dynamic celestial sphere described in display Celestial body；The mapping distance determining module is specific to determine celestial body in dynamic according to the distance of celestial body and observer as follows Mapping distance on celestial sphere：When the distance of celestial body and observer are more than the maximum distance specified, mapping distance of the celestial body on dynamic celestial sphere is Maximum distance；When the distance of celestial body and observer are less than the minimum distance specified, mapping of the celestial body on dynamic celestial sphere Distance is actual range；When the distance of celestial body and observer are between specified maximum distance and the minimum distance specified, Mapping distance of the celestial body on dynamic celestial sphere is calculated according to interpolation algorithm；The specific mapping distance as follows according to the celestial body on dynamic celestial sphere of the mapping point determining module is true Determine mapping point of the celestial body on dynamic celestial sphere：According to the algorithm of spheric coordinate system, by the actual three-dimensional coordinate of celestial body, orientation of the celestial body relative to observer is calculated Angle and elevation angle；According to mapping distance of the celestial body on dynamic celestial sphere, and the azimuth being calculated and elevation angle, institute is determined State mapping point of the celestial body on dynamic celestial sphere.
- 6. celestial sphere mapping device as claimed in claim 5, it is characterised in that also include：Apparent magnitude determining module, for the absolute magnitude according to celestial body, calculate the celestial body regarding with respect to observer current location Magnitude；Brightness and size determining module, for determining brightness and the size of the celestial body according to the apparent magnitude；Brightness and size display module, for showing brightness and the size of the celestial body on the dynamic celestial sphere.
- 7. celestial sphere mapping device as claimed in claim 5, it is characterised in that calculate in real time celestial body and observer apart from when, It is index expression-form by the range conversion of the celestial body and observer.
- 8. celestial sphere mapping device as claimed in claim 6, it is characterised in that the apparent magnitude determining module is specifically according to as follows Formula calculates the apparent magnitude of the celestial body with respect to observer current location：M=M-5.0*log10 (32.616/D)；Wherein, m is the apparent magnitude；M is absolute magnitude；D is celestial body and the distance of observer.
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| CN101115168A (en) * | 2006-07-27 | 2008-01-30 | 佳能株式会社 | Generating images combining real and virtual images |
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