CN109813526A - A kind of optical telescope outfield tracking accuracy detection method based on astrofix - Google Patents
A kind of optical telescope outfield tracking accuracy detection method based on astrofix Download PDFInfo
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Abstract
The optical telescope outfield tracking accuracy detection method based on astrofix that the invention discloses a kind of, comprising the following steps: setting can cover the track path of the speed, acceleration range of tracking accuracy detection；According to target speed, tracking initial velocity is given, sets initial time, simulation virtual target movement, telescope starting automatically tracks；According to sample frequency, observation D of the extraterrestrial target on ccd image when calculating each sampling instantt(X, Y), by Dt(X, Y) guidance telescope is automatically tracked；Calculate the tracking accuracy of telescope.The invention is simple and feasible, and detection accuracy is determined by the fixed star star catalogue used, can achieve very high precision, much higher than indoor detection device and the attainable precision of traditional detection method, it is feasible at any time without added burden, it can be widely used in the outfield tracking accuracy inspection of optical telescope.
Description
Technical field
The invention belongs to optical telescope outfield tracking accuracy technical fields, and in particular to a kind of light based on astrofix
Learn telescope outfield tracking accuracy detection method.
Background technique
Since optical telescope comes out, optical telescope is always the most important tool that the mankind explore space.With people
Make satellite heaven, extraterrestrial target quantity increases considerably, it is widely used in Space-objects Observation again, optical telescope at
It is a kind of important means of extraterrestrial target Situation Awareness for component part important in Space Target Surveillance net.Tracking accuracy is
One of important technology index of optical telescope.Tracking accuracy refers to telescope within the scope of certain angular speed and angular acceleration
The degree of fluctuation of real-time measurement tracking target.
Currently, the measurement of tracking accuracy generally uses indoor tracking emulation rotation target and outfield tracking real space target
Actual measurement is to realize.Indoor Simulation rotates target and carries out constant speed or the movement of sinusoidal motion simulation space aim, telescope real-time tracking
The target, while charge coupled cell (Charge Coupled Device, CCD) image of target is obtained, by missing the target for target
Amount calculates tracking accuracy.Since there are more error sources for movement target in this method, and error is larger, causes to rotate target
The precision of itself is lower, therefore equipment under test precision is lower；It is limited additionally, due to structure, for the tracking accuracy of large telescope
Detection, to rotary target target production more stringent requirements are proposed and increases difficulty.And outfield detection method is to use to look in the distance
Mirror real-time tracking extraterrestrial target calculates miss distance from the ccd image of acquisition to obtain the tracking accuracy of telescope, but due to true
Real space target speed section is single, can not achieve the traversal of each speed, furthermore the precision of real space target position
The limitation of image procossing, centering precision is relied on, therefore additional error source is introduced for the measurement of tracking error.
Summary of the invention
The technical problem to be solved by the present invention is to solve the above shortcomings of the prior art and to provide one kind to be based on astrofix
Optical telescope outfield tracking accuracy detection method.The present invention uses astronomical positioning method offer to rotate with a fixed angular speed
Simulation space target, optical telescope automatically track simulation objectives, to realize in scheduled velocity and acceleration condition section
To the measurement of optical telescope outfield tracking accuracy under constraint.
To realize the above-mentioned technical purpose, the technical scheme adopted by the invention is as follows:
A kind of optical telescope outfield tracking accuracy detection method based on astrofix, comprising the following steps:
(1) setting can cover the track path of the speed, acceleration range of tracking accuracy detection；
(2) according to target speed, tracking initial velocity is given, sets initial time, simulation virtual target movement is hoped
Remote mirror starting automatically tracks；
(3) according to sample frequency, observation D of the extraterrestrial target on ccd image when calculating each sampling instant tt(X,
), Y by Dt(X, Y) guidance telescope is automatically tracked；
(4) tracking accuracy of telescope is calculated.
To optimize above-mentioned technical proposal, the concrete measure taken further include:
Above-mentioned step (1) specifically:
Image is acquired using telescope, the direction Q (α, δ) under current celestial coordinate system is calculated according to star background, in day
On ball centered on point P (α, δ+r) or P (α, δ-r), a circumference S is drawn by radius of r, circumference S is set as extraterrestrial target D's
The track path of motion path and telescope.
Above-mentioned step (2) specifically:
According to the path that step (1) is set, telescope has been located in track path at this time, gives telescope tracking initial velocity
Afterwards, start timing, Virtual Space target D is moved with constant speed ω along S, and telescope starts to automatically track.
Above-mentioned step (3) the following steps are included:
(3.1) telescope samples during tracking, according to sampling instant t, by the celestial coordinate of central point P, radius r,
Angular velocity of rotation ω parameter calculates theoretical position D of the extraterrestrial target D in celestial coordinate systemt(αc,δc)；
(3.2) it according to the background fixed star information on the collected ccd image of telescope, is calculated using astronomical positioning method
To the plate constant of ccd image, the i.e. transformational relation of celestial coordinate system and image coordinate system；
(3.3) according to the transformational relation of the celestial coordinate system and image coordinate system, by theoretical value Dt(αc,δc) when obtaining
Carve measured coordinate D of the t extraterrestrial target D on ccd imaget(X, Y), by Dt(X, Y) obtains miss distance Dt(Xδ,Yδ), and utilize institute
It states miss distance and calculates the speed parameter that telescope is adjusted to CCD field of view center, it is automatic to guide telescope tracking so that extraterrestrial target D
It is maintained at CCD field of view center；
(3.4) circumferentially S makees the pursuit movement to move in circles with extraterrestrial target D to telescope, and telescope makees traversal speed
The speed change varying accelerated motion in section and acceleration section, to detect telescope in the tracking essence in velocity and acceleration section
Degree.
Above-mentioned step (4) described calculation method is as follows:
After the data for obtaining at least one period, according to the miss distance sequence D at obtained each momenti(Xδ,Yδ) calculate it
Standard deviation obtains the tracking accuracy of telescope.
The invention has the following advantages:
The present invention is subtracted for indoor dynamic rotary target using the rotation simulation objectives that astronomical positioning method provides
Mechanical structured member is lacked due to manufacturing installation error bring static and dynamic errors, the simulation space target positioning accurate of offer
Degree depends on the star catalogue precision used, and current star catalogue precision is far superior to the measurement demand of tracking accuracy, substantially increases survey
Measure the ability of tracking accuracy；Tracking accuracy method, traditional outfield detection method are measured relative to traditional outfield tracking extraterrestrial target
The velocity and acceleration of the extraterrestrial target movement of tracking is single or can not cover the velocity and acceleration range of telescope, Bu Nengjian
The velocity and acceleration overall situation performance of telescope is surveyed, thus is difficult to examine the time of day of telescope.
Detailed description of the invention
Fig. 1 is workflow schematic diagram of the invention.
Specific embodiment
The embodiment of the present invention is described in further detail below in conjunction with attached drawing.
Referring to Fig. 1, a kind of optical telescope outfield tracking accuracy detection method based on astrofix of the invention, including
Following steps:
(1) setting can cover the track path of the speed, acceleration range of tracking accuracy detection:
In embodiment, image is acquired using telescope, the direction Q under current celestial coordinate system is calculated according to star background
(α, δ) draws a circumference S by radius of r, circumference S is set as empty on celestial sphere centered on point P (α, δ+r) or P (α, δ-r)
Between the motion path of target D and the track path of telescope.
(2) according to target speed, tracking initial velocity is given, sets initial time, simulation virtual target movement is hoped
Remote mirror starting automatically tracks:
In embodiment, according to step (1) set path, telescope has been located in track path at this time, give telescope with
After track initial velocity, start timing, Virtual Space target D is moved with constant speed ω along S, and telescope starts to automatically track.
(3) according to sample frequency, observation D of the extraterrestrial target on ccd image when calculating each sampling instant tt(X,
), Y by Dt(X, Y) guidance telescope is automatically tracked
In embodiment, comprising the following steps:
(3.1) telescope samples during tracking, according to sampling instant t, by the celestial coordinate of central point P, radius r,
Angular velocity of rotation ω parameter calculates theoretical position D of the extraterrestrial target D in celestial coordinate systemt(αc,δc)；
(3.2) it according to the background fixed star information on the collected ccd image of telescope, is calculated using astronomical positioning method
To the plate constant of ccd image, the i.e. transformational relation of celestial coordinate system and image coordinate system；
(3.3) according to the transformational relation of the celestial coordinate system and image coordinate system, by theoretical value Dt(αc,δc) when obtaining
Carve measured coordinate D of the t extraterrestrial target D on ccd imaget(X, Y), by Dt(X, Y) obtains miss distance Dt(Xδ,Yδ), and utilize institute
It states miss distance and calculates the speed parameter that telescope is adjusted to CCD field of view center, it is automatic to guide telescope tracking so that extraterrestrial target D
It is maintained at CCD field of view center；
(3.4) circumferentially S makees the pursuit movement to move in circles with extraterrestrial target D to telescope, and telescope makees traversal speed
The speed change varying accelerated motion in section and acceleration section, to detect telescope in the tracking essence in velocity and acceleration section
Degree.
(4) tracking accuracy of telescope is calculated:
In embodiment, after the data for obtaining at least one period, according to the miss distance sequence D at obtained each momenti(Xδ,
Yδ) calculate its standard deviation and obtain the tracking accuracy of telescope.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (5)
1. a kind of optical telescope outfield tracking accuracy detection method based on astrofix, it is characterised in that: including following step
It is rapid:
(1) setting can cover the track path of the speed, acceleration range of tracking accuracy detection；
(2) according to target speed, tracking initial velocity is given, sets initial time, simulation virtual target movement, telescope
Starting automatically tracks；
(3) according to sample frequency, observation D of the extraterrestrial target on ccd image when calculating each sampling instant tt(X, Y), by Dt
(X, Y) guidance telescope is automatically tracked；
(4) tracking accuracy of telescope is calculated.
2. a kind of optical telescope outfield tracking accuracy detection method based on astrofix according to claim 1,
It is characterized in that: step (1) specifically:
Image is acquired using telescope, the direction Q (α, δ) under current celestial coordinate system is calculated according to star background, on celestial sphere
Centered on point P (α, δ+r) or P (α, δ-r), a circumference S is drawn by radius of r, circumference S is set as the movement of extraterrestrial target D
The track path of path and telescope.
3. a kind of optical telescope outfield tracking accuracy detection method based on astrofix according to claim 2,
It is characterized in that: step (2) specifically:
According to step (1) set path, give telescope tracking initial velocity after, start timing, Virtual Space target D with etc.
Fast ω is moved along S, and telescope starts to automatically track.
4. a kind of optical telescope outfield tracking accuracy detection method based on astrofix according to claim 3,
Be characterized in that: step (3) the following steps are included:
(3.1) telescope samples during tracking, according to sampling instant t, by the celestial coordinate of central point P, radius r, rotation
Angular velocity omega parameter calculates theoretical position D of the extraterrestrial target D in celestial coordinate systemt(αc,δc)；
(3.2) it according to the background fixed star information on the collected ccd image of telescope, is calculated using astronomical positioning method
The transformational relation of the plate constant of ccd image, i.e. celestial coordinate system and image coordinate system；
(3.3) according to the transformational relation of the celestial coordinate system and image coordinate system, by theoretical value Dt(αc,δc) obtain moment t sky
Between measured coordinate D of the target D on ccd imaget(X, Y), by Dt(X, Y) obtains miss distance Dt(Xδ,Yδ), and miss the target described in utilization
Amount calculates the speed parameter that telescope is adjusted to CCD field of view center, automatic to guide telescope tracking so that extraterrestrial target D is maintained at
CCD field of view center；
(3.4) circumferentially S makees the pursuit movement to move in circles with extraterrestrial target D to telescope, and telescope makees traversal speed interval
With the speed change varying accelerated motion in acceleration section, to detect telescope in the tracking accuracy in velocity and acceleration section.
5. a kind of optical telescope outfield tracking accuracy detection method based on astrofix according to claim 4,
Be characterized in that: step (4) described calculation method is as follows:
After the data for obtaining at least one period, according to the miss distance sequence D at obtained each momenti(Xδ,Yδ) calculate its standard
Deviation obtains the tracking accuracy of telescope.
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| CN111708381A (en) * | 2020-06-29 | 2020-09-25 | 西安方元明科技股份有限公司 | Tracking precision testing method for double-shaft tracking rotary table |
| CN111766696A (en) * | 2020-06-12 | 2020-10-13 | 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 |
| CN111879299A (en) * | 2020-08-17 | 2020-11-03 | 中国科学院上海天文台 | Full-automatic satellite pointing method for ground-based telescope |
| CN115200573A (en) * | 2022-09-08 | 2022-10-18 | 中国人民解放军63921部队 | Space target measuring equipment positioning method, system and storage medium |
| CN116736878A (en) * | 2023-08-15 | 2023-09-12 | 德博睿宇航科技(北京)有限公司 | Full-automatic remote control artificial satellite observation system and method |
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