CN103884336A - Establishment method of daytime star sensor-based infrared star detection navigation star catalogue - Google Patents
Establishment method of daytime star sensor-based infrared star detection navigation star catalogue Download PDFInfo
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Abstract
The invention relates to an establishment method of a daytime star sensor-based infrared star detection navigation star catalogue, and belongs to the technical field of design of aerospace attitude sensors. The method comprises the following steps of extracting fixed stars of which any band is higher than or equal to the magnitude 8 from a 2MASS astronomical catalogue, and removing redundant information to form a basic star catalogue for cross certification; performing star catalogue cross certification on data sources of the obtained basic star catalogue and a check star catalogue; performing data fusion on the data sources of the basic star catalogue and the check star catalogue, which pass the star catalogue cross certification, to obtain a star catalogue database; performing file format finishing database establishment on the obtained star catalogue database, wherein the finished star catalogue database comprises a main data file and a data index file; performing instrument star magnitude conversion on the data source of the finished star catalogue database to establish an instrument star magnitude star catalogue; and performing star catalogue homogenizing on the obtained instrument star magnitude star catalogue, and generating a daytime star sensor-based navigation star catalogue by using the homogenized star catalogue database.
Description
Technical field
The present invention relates to a kind of based on daytime star sensor infrared fixed star survey the method for building up of navigational star table, belong to Aero-Space attitude sensor design field.
Background technology
Star sensor is the optical attitude sensor using fixed star as measurement target, can export high-precision attitude information.Importance in star map recognition is the core technology of star sensor, and setting up navigational star table is the important prerequisite of identification star chart.Star sensor, mainly take work at night as main, not yet solves the star observation problem under environment in daytime at present.
Must be subject to the impact of scattering sunshine at endoatmosphere daylight observation starlight, can survey magnitude ultimate value can have very big difference because these conditions change.And the daylight sky radiation degree of infrared band is more much lower than visible ray, be 1/6 and 1/8 of I wave band at the sky radiation degree of H band and K wave band.In addition, the Zenith Distance transfer rate of infrared band is higher, and should be than lower at visible ray to the decay of starlight at infrared band atmosphere dim (as cigarette, mist and cloud).Therefore, at infrared band, atmospheric scattering is lower, and transmitance is higher, and observation fixed star probability is high.
Summary of the invention
The object of the invention is in order to overcome the deficiencies in the prior art, provide a kind of based on daytime star sensor infrared fixed star survey the method for building up of navigational star table, solve the star observation problem under environment in daytime, greatly improve the probability of short-wave infrared star observation, improve importance in star map recognition success ratio, made star sensor possess endoatmosphere work double tides ability.
The object of the invention is to be achieved through the following technical solutions.
Of the present invention a kind of based on daytime star sensor infrared fixed star survey the method for building up of navigational star table, step is as follows:
(1) selection of basic star catalogue and verification star catalogue.Choose 2MASS astronomical catalog and Hipparcos astronomical catalog basic star catalogue and the verification star catalogue as star sensor catalogue data in daytime storehouse.
(2) input of basic star catalogue and verification star catalogue.From 2MASS astronomical catalog, extract J (1.2 μ m), H (1.6 μ m), Ks (2.2 μ m) the arbitrary wave band magnitude of wave band bright in or equal 8 etc. fixed star, and eliminate redundancy information, is formed for intersecting the basic star catalogue of identification.From Hipparcos astronomical catalog, extract magnitude bright in or equal 8 etc. fixed star, and eliminate redundancy information, is formed for intersecting the verification star catalogue of identification.Information in basis star catalogue and verification star catalogue should comprise: multiband magnitude, magnitude error, position, voluntarily, index, spectral type, double star mark, variable mark etc.
(3) by the data source of basic star catalogue (2MASS astronomical catalog) and verification star catalogue (Hipparcos astronomical catalog), according to the correlativity of its some attribute (as position, star names, magnitude), carry out star catalogue cross-certification;
Before the identification of catalogue data intersection starts, deposit respectively 2MASS astronomical catalog and Hipparcos astronomical catalog data in database, be converted into database table, a source in every corresponding star catalogue of table record, an attribute column of the corresponding star catalogue of each literary name section; Utilize multistage triangle division method, celestial sphere is divided into multistage triangle gridding; Extract wherein arbitrary grid; From 2MASS astronomical catalog, read all sources that belong to this grid; Forward if it is empty next grid to; If not empty, reading all sources that belong to this grid from Hipparcos astronomical catalog; Forward if it is empty next grid to; If not empty, read the positional information in source in 2MASS astronomical catalog and Hipparcos astronomical catalog, fusion error is set, same target regarded as in the source in error radius, use magnitude information as verification simultaneously, carry out data identification, then saving result; The all grids of whole day ball after all processing finishes, carry out result and gather, and according to the fixed star information data structure saving result of definition, and carry out stock management, generate catalogue data storehouse, and catalogue data intersects identification and finishes.
(4) data source of basic star catalogue and verification star catalogue is carried out to data fusion, first extract and in 2MASS astronomical catalog (basic star catalogue), meet J (1.2 μ m), (1.6 μ m) for H, Ks (2.2 μ m) the arbitrary wave band magnitude of wave band bright in or equal the position of the fixed star of all targets of the conditions such as 8, positional precision, magnitude information, magnitude precision, photometry magnitude, photometry precision and double star mark, origin marking (magnitude, position) information, then extract the middle fixed star of Hipparcos astronomical catalog (verification star catalogue) voluntarily, precision voluntarily, trigonometric parallax, double star mark, numbering, origin marking (magnitude, position) information, carry out data fusion.If merge successfully, from 2MASS astronomical catalog, extract meet J (1.2 μ m), H (1.6 μ m), Ks (2.2 μ m) the arbitrary wave band magnitude of wave band bright in or equal the position coordinates of all targets and the photometry magnitude of these 3 wave bands and the photometry accuracy data of the conditions such as 8, form star catalogue master database, from Hipparcos astronomical catalog, extract again the trigonometric parallax of this target and information voluntarily, and add star catalogue master database; If data fusion is unsuccessful, master database intermediate cam parallax and voluntarily item be all taken as " 0 ".Finally, form catalogue data storehouse, data fusion finishes.
(5) star catalogue is built to storehouse, basic star catalogue and verification star catalogue are carried out to catalogue data storehouse after data fusion and carry out file layout and arrange and build storehouse.Catalogue data storehouse after arrangement is made up of master data file, data directory file.
(6) data source in catalogue data storehouse is carried out to the conversion of instrument magnitude, set up instrument magnitude star catalogue.According to the spectral response characteristic of star sensor in daytime, using the data source in catalogue data storehouse as input, generate the instrument magnitude star catalogue of star sensor in daytime, concrete steps are as follows:
Search the spectral type of data source in catalogue data storehouse, the input hypothesis curve of spectrum; By the each wave band optical filter response curve convolution in theoretical spectral curve and the astronomical optical filter Johnson/Bessel of standard filter system, obtain the curve of spectrum x after each wave band convolution
0; To the theoretical spectral curve x under the each wave band obtaining after convolution
0carry out flow integration, obtain the energy of this fixed star under each filter system; Then the relation of the energy of this fixed star and the astronomical magnitude m of standard under each filter system that matching generates, fitting formula is:
m=-2.5logflux
0+C
0
In formula, C0 is the parameter that characterizes fixed star distance, interstellar extinction and interstellar reddening; Utilize and calculate the parameters C obtaining
0calculate the simulated spectra curve x that generates data source in catalogue data storehouse, computing formula is:
flux=flux
0×10
-0.4C0
By calculate the simulated spectra curve x that generates and daytime star sensor spectral response convolution, after convolution, obtain the real spectrum curve x of data source in catalogue data storehouse; Then the real spectrum curve x of data source is carried out to integration, obtain the stellar energy under star sensor spectral response in daytime; The instrument magnitude m that can calculate this fixed star according to the stellar energy obtaining, computing formula is:
m=-2.5logflux
Each data source in catalogue data storehouse is carried out to the calculating of instrument magnitude, set up instrument magnitude star catalogue.
(7) instrument magnitude star catalogue is carried out to star catalogue homogenize, the catalogue data storehouse after homogenize is generated to star sensor navigational star table in daytime.Determine the brightness (being the magnitude of nautical star) of the required sensitivity of star sensor in daytime according to the nautical star acquisition probability of the selected visual field of star sensor in daytime and expection; In instrument magnitude star catalogue, screen nautical star according to definite brightness; After screening, reject again two, variable in star catalogue; After rejecting two, the variable in star catalogue, reject again intensive stellar field; Finally generate the catalogue data storehouse after homogenize, star catalogue homogenize finishes.Through above-mentioned steps, finally generate star sensor navigational star table in daytime.
The present invention's advantage is compared with prior art: the present invention overcomes the deficiencies in the prior art, has set up the special infrared operation spectral coverage fixed star of a kind of star sensor in daytime and has surveyed navigational star table.By adopting 2MASS infrared astronomy star catalogue and Hipparcos astronomical catalog basic star catalogue and the verification star catalogue as star sensor catalogue data in daytime storehouse, basic star catalogue and verification star catalogue are carried out to data cross authentication and Data Fusion, and instrument magnitude conversion and star catalogue homogenize processing are carried out in catalogue data storehouse, generate the infrared fixed star detection navigational star table of star sensor in a kind of daytime.Solve the star observation problem under environment in daytime, greatly improve the probability of short-wave infrared star observation, improve importance in star map recognition success ratio, completed sensing high precision by Star image acquisition, importance in star map recognition, information processing and determine, made star sensor possess endoatmosphere work double tides ability.The present invention is exactly a kind of navigational star table based on star sensor in daytime for the star observation problem invention under daytime environment, has set up the special infrared operation spectral coverage fixed star of star sensor in daytime and has surveyed navigational star table.According to the feature of daylight observation fixed star, greatly improve the probability of short-wave infrared star observation, improve importance in star map recognition success ratio, made star sensor possess endoatmosphere work double tides ability, for the platforms such as the various aircraft in endoatmosphere, boats and ships provide astronomical autonomous heading, navigation Service.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the inventive method;
Fig. 2 is catalogue data cross-certification process flow diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment
As shown in Figure 1, be the process flow diagram of the inventive method.The present invention a kind of based on daytime star sensor the infrared fixed star method for building up of surveying navigational star table mainly comprise following step: the selection of basic star catalogue and verification star catalogue; The input of basis star catalogue and verification star catalogue; Star catalogue cross-certification; Catalogue data merges; Star catalogue is built to storehouse; The conversion of instrument magnitude, sets up instrument magnitude star catalogue; Star catalogue homogenize, generates star sensor navigational star table in daytime.
Respectively each key step is described below.
(1) selection of basic star catalogue and verification star catalogue.Choose 2MASS astronomical catalog and Hipparcos astronomical catalog basic star catalogue and the verification star catalogue as star sensor catalogue data in daytime storehouse.
2MASS astronomical catalog: the position that comprises 470,992,970 Point Target and the point source star catalogue of photometry information, point source star catalogue has covered 99.997% sky.
Hipparcos astronomical catalog: comprise altogether 118,218 stars, wherein 11597 stars determine that (or possibility) is variable, star catalogue limiting magnitude 12.4 etc., V-band 7.3-9.0 etc. are complete, photometry precision 0.0015 etc.
(2) input of basic star catalogue and verification star catalogue.From 2MASS astronomical catalog, extract J (1.2 μ m), H (1.6 μ m), Ks (2.2 μ m) the arbitrary wave band magnitude of wave band bright in or equal 8 etc. fixed star, and eliminate redundancy information, is formed for intersecting the basic star catalogue of identification.From Hipparcos astronomical catalog, extract magnitude bright in or equal 8 etc. fixed star, and eliminate redundancy information, is formed for intersecting the verification star catalogue of identification.Information in basis star catalogue and verification star catalogue should comprise: multiband magnitude, magnitude error, position, voluntarily, index, spectral type, double star mark, variable mark etc.
(3) by the data source of basic star catalogue (2MASS astronomical catalog) and verification star catalogue (Hipparcos astronomical catalog), according to the correlativity of its some attribute (as position, star names, magnitude), carry out star catalogue cross-certification, its step as shown in Figure 2:
Before the identification of catalogue data intersection starts, deposit respectively 2MASS astronomical catalog and Hipparcos astronomical catalog data in database, be converted into database table, a source in every corresponding star catalogue of table record, an attribute column of the corresponding star catalogue of each literary name section; Utilize multistage triangle division method, celestial sphere is divided into multistage triangle gridding; Extract wherein arbitrary grid; From 2MASS astronomical catalog, read all sources that belong to this grid; Forward if it is empty next grid to; If not empty, reading all sources that belong to this grid from Hipparcos astronomical catalog; Forward if it is empty next grid to; If not empty, read the positional information in source in 2MASS astronomical catalog and Hipparcos astronomical catalog, fusion error is set, same target regarded as in the source in error radius, use magnitude information as verification simultaneously, carry out data identification, then saving result; The all grids of whole day ball after all processing finishes, carry out result and gather, and according to the fixed star information data structure saving result of definition, and carry out stock management, generate catalogue data storehouse, and catalogue data intersects identification and finishes.
Multistage triangle division method: be a kind of sphere dividing method multi-level, recurrence, celestial sphere can be divided into multistage triangle gridding, utilize the multistage triangle division method can be by a large star catalogue from being divided in logic multiple little star catalogues.
(4) data source of basic star catalogue and verification star catalogue is carried out to data fusion, first extract and in 2MASS astronomical catalog (basic star catalogue), meet J (1.2 μ m), (1.6 μ m) for H, Ks (2.2 μ m) the arbitrary wave band magnitude of wave band bright in or equal the position of the fixed star of all targets of the conditions such as 8, positional precision, magnitude information, magnitude precision, photometry magnitude, photometry precision and double star mark, origin marking (magnitude, position) information, then extract the middle fixed star of Hipparcos astronomical catalog (verification star catalogue) voluntarily, precision voluntarily, trigonometric parallax, double star mark, numbering, origin marking (magnitude, position) information, carry out data fusion.If merge successfully, from 2MASS astronomical catalog, extract meet J (1.2 μ m), H (1.6 μ m), Ks (2.2 μ m) the arbitrary wave band magnitude of wave band bright in or equal the position coordinates of all targets and the photometry magnitude of these 3 wave bands and the photometry accuracy data of the conditions such as 8, form star catalogue master database, from Hipparcos astronomical catalog, extract again the trigonometric parallax of this target and information voluntarily, and add star catalogue master database; If data fusion is unsuccessful, master database intermediate cam parallax and voluntarily item be all taken as " 0 ".Finally, form catalogue data storehouse, data fusion finishes.
(5) star catalogue is built to storehouse, basic star catalogue and verification star catalogue are carried out to catalogue data storehouse after data fusion and carry out file layout and arrange and build storehouse.Catalogue data storehouse after arrangement is made up of master data file, data directory file.
Master data file: store the details of each fixed star with binary file form, comprise 1,345,631 sources, single star details comprise: right ascension, declination, the oval semi-major axis of 1 σ site error, the oval semi-minor axis of 1 σ site error, parallax, title in 2MASS star catalogue, J wave band magnitude, J wave band magnitude error, H band magnitude, H band magnitude error, Ks wave band magnitude, Ks wave band magnitude error, J, H, Ks wave band magnitude acquisition methods label, proper motion in right ascension, proper motion in declination.Sort according to right ascension increment in master data file inside.
Index file: with the quick key assignments of ASCII character form memory access master data file.Can locate fast the inside block of master data file by this index, to inquire about among a small circle.Each master data file is a corresponding block in this index file, and each block is made up of 180 row data, the corresponding 2 degree right ascension scopes of every data line.Each row of data comprises two information, between two information with space-separated.Section 1 is the index position of first star in this region, and Section 2 is the quantity of fixed star in this region.Index position is started at from 0, and step-length is 1.
(6) data source in catalogue data storehouse is carried out to the conversion of instrument magnitude, set up instrument magnitude star catalogue.According to the spectral response characteristic of star sensor in daytime, using the data source in catalogue data storehouse as input, generate the instrument magnitude star catalogue of star sensor in daytime, concrete steps are as follows:
Search the spectral type A0V of data source in catalogue data storehouse (0.230581 ° of right ascension, declination-30.0642 °), the input hypothesis curve of spectrum; By the each wave band optical filter response curve convolution in theoretical spectral curve and the astronomical optical filter Johnson/Bessel of standard filter system, obtain the curve of spectrum x after each wave band convolution
0; To the theoretical spectral curve x under the each wave band obtaining after convolution
0carry out flow integration, obtain the energy of this fixed star under each filter system; Then the relation of the energy of this fixed star and the astronomical magnitude m of standard under each filter system that matching generates, fitting formula is:
m=-2.5logflux
0+C
0
In formula, C0 is the parameter that characterizes fixed star distance, interstellar extinction and interstellar reddening; Utilize and calculate the parameters C obtaining
0calculate the simulated spectra curve x that generates data source in catalogue data storehouse, computing formula is:
flux=flux
0×10
-0.4C0
By calculate the simulated spectra curve x that generates and daytime star sensor spectral response convolution, after convolution, obtain the real spectrum curve x of data source in catalogue data storehouse; Then the real spectrum curve x of data source is carried out to integration, obtain the stellar energy under star sensor spectral response in daytime; The instrument magnitude m that can calculate this fixed star according to the stellar energy obtaining is 8.4153, and computing formula is:
m=-2.5logflux
Each data source in catalogue data storehouse is carried out to the calculating of instrument magnitude, set up instrument magnitude star catalogue.
(7) instrument magnitude star catalogue is carried out to star catalogue homogenize, the catalogue data storehouse after homogenize is generated to star sensor navigational star table in daytime.Determine the brightness (being the magnitude of nautical star) of the required sensitivity of star sensor in daytime according to the nautical star acquisition probability of the selected visual field of star sensor in daytime and expection; In instrument magnitude star catalogue, screen nautical star according to definite brightness; After screening, reject again two, variable in star catalogue; After rejecting two, the variable in star catalogue, reject again intensive stellar field; Finally generate the catalogue data storehouse after homogenize, star catalogue homogenize finishes.Through above-mentioned steps, finally generate star sensor navigational star table in daytime.This star catalogue comprises 1,345, and 631 near infrared J, H, Ks wave band are bright in 8 etc. Point Target, and photometry precision is better than 0.05 etc., and positional precision is better than 0.07 ".Star catalogue is with reference to being J2000.0 mean equinox mean equator coordinate system, and star catalogue epoch is 2000.0.
The content not being described in detail in instructions of the present invention belongs to those skilled in the art's known technology.
Claims (8)
- Based on daytime star sensor infrared fixed star survey the method for building up of navigational star table, it is characterized in that step is:(1) the basic star catalogue using 2MASS astronomical catalog as star sensor catalogue data in daytime storehouse, the verification star catalogue using Hipparcos astronomical catalog as star sensor catalogue data in daytime storehouse;(2) from 2MASS astronomical catalog, extract J (1.2 μ m), H (1.6 μ m), Ks (2.2 μ m) the arbitrary wave band magnitude of wave band bright in or equal 8 etc. fixed star, and eliminate redundancy information, be formed for intersecting the basic star catalogue of identification;From Hipparcos astronomical catalog, extract magnitude bright in or equal 8 etc. fixed star, and eliminate redundancy information, is formed for intersecting the verification star catalogue of identification;Information in basis star catalogue and verification star catalogue comprises: multiband magnitude, magnitude error, position, voluntarily, index, spectral type, double star mark and variable mark;(3), by the data source of the basic star catalogue obtaining in step (2) and verification star catalogue, according to the correlativity of its position, star names, magnitude, carry out star catalogue cross-certification;(4) the basic star catalogue after step (3) star catalogue cross-certification and the data source of verification star catalogue are carried out to data fusion, obtain catalogue data storehouse;(5) catalogue data storehouse step (4) being obtained is carried out file layout arrangement and is built storehouse; Catalogue data storehouse after arrangement comprises master data file and data directory file;(6) data source in the catalogue data storehouse after the arrangement obtaining in step (5) is carried out to the conversion of instrument magnitude, set up instrument magnitude star catalogue;(7) instrument magnitude star catalogue step (6) being obtained carries out star catalogue homogenize, and the catalogue data storehouse after homogenize is generated to star sensor navigational star table in daytime.
- According to claim 1 a kind of based on daytime star sensor infrared fixed star survey the method for building up of navigational star table, it is characterized in that: in step (3), the method for star catalogue cross-certification is: before the identification of catalogue data intersection starts, deposit respectively 2MASS astronomical catalog and Hipparcos astronomical catalog data in database, be converted into database table, a source in every corresponding star catalogue of table record, an attribute column of the corresponding star catalogue of each literary name section; Utilize multistage triangle division method, celestial sphere is divided into multistage triangle gridding; Extract wherein arbitrary grid; From 2MASS astronomical catalog, read all sources that belong to this grid; Forward if it is empty next grid to; If not empty, reading all sources that belong to this grid from Hipparcos astronomical catalog; Forward if it is empty next grid to; If not empty, read the positional information in source in 2MASS astronomical catalog and Hipparcos astronomical catalog, fusion error is set, same target regarded as in the source in error radius, use magnitude information as verification simultaneously, carry out data identification, then saving result; The all grids of whole day ball after all processing finishes, carry out result and gather, and according to the fixed star information data structure saving result of definition, and carry out stock management, generate catalogue data storehouse, and catalogue data intersects identification and finishes.
- According to claim 1 a kind of based on daytime star sensor infrared fixed star survey the method for building up of navigational star table, it is characterized in that: the method for data fusion is in step (4): first extract and in 2MASS astronomical catalog, meet J (1.2 μ m), (1.6 μ m) for H, Ks (2.2 μ m) the arbitrary wave band magnitude of wave band bright in or equal the position of the fixed star of all targets of the conditions such as 8, positional precision, magnitude information, magnitude precision, photometry magnitude, photometry precision and double star mark, origin marking information, then extract in Hipparcos astronomical catalog fixed star voluntarily, precision voluntarily, trigonometric parallax, double star mark, numbering, origin marking information, carry out data fusion, if merge successfully, from 2MASS astronomical catalog, extract meet J (1.2 μ m), H (1.6 μ m), Ks (2.2 μ m) the arbitrary wave band magnitude of wave band bright in or equal the position coordinates of all targets and the photometry magnitude of these 3 wave bands and the photometry accuracy data of the conditions such as 8, form star catalogue master database, from Hipparcos astronomical catalog, extract again the trigonometric parallax of this target and information voluntarily, and add star catalogue master database, if data fusion is unsuccessful, master database intermediate cam parallax and voluntarily item be all taken as " 0 ", finally, form catalogue data storehouse, data fusion finishes.
- According to claim 3 a kind of based on daytime star sensor infrared fixed star survey the method for building up of navigational star table, it is characterized in that: origin marking comprises magnitude and positional information.
- According to claim 1 a kind of based on daytime star sensor infrared fixed star survey the method for building up of navigational star table, it is characterized in that: in step (5), master data file is: the details of storing each fixed star with binary file form, comprise 1, 345, 631 sources, single star details comprise: right ascension, declination, the oval semi-major axis of 1 σ site error, the oval semi-minor axis of 1 σ site error, parallax, title in 2MASS star catalogue, J wave band magnitude, J wave band magnitude error, H band magnitude, H band magnitude error, Ks wave band magnitude, Ks wave band magnitude error, J, H, Ks wave band magnitude acquisition methods label, proper motion in right ascension, proper motion in declination, sort according to right ascension increment in master data file inside.
- According to claim 1 a kind of based on daytime star sensor infrared fixed star survey the method for building up of navigational star table, it is characterized in that: in step (5), index file is: with the quick key assignments of ASCII character form memory access master data file; Can locate fast the inside block of master data file by this index, to inquire about among a small circle; Each master data file is a corresponding block in this index file, and each block is made up of 180 row data, the corresponding 2 degree right ascension scopes of every data line; Each row of data comprises two information, between two information with space-separated; Section 1 is the index position of first star in this region, and Section 2 is the quantity of fixed star in this region; Index position is started at from 0, and step-length is 1.
- According to claim 1 a kind of based on daytime star sensor infrared fixed star survey the method for building up of navigational star table, it is characterized in that: the method for building up of setting up instrument magnitude star catalogue in step (6) is: according to the spectral response characteristic of star sensor in daytime, using the data source in catalogue data storehouse as input, the instrument magnitude star catalogue that generates star sensor in daytime, concrete steps are as follows:Search the spectral type of data source in catalogue data storehouse, the input hypothesis curve of spectrum; By the each wave band optical filter response curve convolution in theoretical spectral curve and the astronomical optical filter Johnson/Bessel of standard filter system, obtain the curve of spectrum x after each wave band convolution 0; To the theoretical spectral curve x under the each wave band obtaining after convolution 0carry out flow integration, obtain the energy of this fixed star under each filter system; Then the relation of the energy of this fixed star and the astronomical magnitude m of standard under each filter system that matching generates, fitting formula is:m=-2.5logflux 0+C 0C in formula 0for characterizing the parameter of fixed star distance, interstellar extinction and interstellar reddening; Utilize and calculate the parameters C obtaining 0calculate the simulated spectra curve x that generates data source in catalogue data storehouse, computing formula is:flux=flux 0×10 -0.4C0By calculate the simulated spectra curve x that generates and daytime star sensor spectral response convolution, after convolution, obtain the real spectrum curve x of data source in catalogue data storehouse; Then the real spectrum curve x of data source is carried out to integration, obtain the stellar energy under star sensor spectral response in daytime; The instrument magnitude m that can calculate this fixed star according to the stellar energy obtaining, computing formula is:m=-2.5logfluxEach data source in catalogue data storehouse is carried out to the calculating of instrument magnitude, set up instrument magnitude star catalogue.
- According to claim 1 a kind of based on daytime star sensor infrared fixed star survey the method for building up of navigational star table, it is characterized in that: in step (7), the method for star catalogue homogenize is: determine that according to the selected visual field of star sensor in daytime and the nautical star acquisition probability of expection the brightness of the required sensitivity of star sensor in daytime is the magnitude of nautical star; In instrument magnitude star catalogue, screen nautical star according to definite brightness; After screening, reject again two, variable in star catalogue; After rejecting two, the variable in star catalogue, reject again intensive stellar field; Finally generate the catalogue data storehouse after homogenize, star catalogue homogenize finishes.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106055700A (en) * | 2016-06-16 | 2016-10-26 | 中国科学院国家天文台 | Infrared band flux expansion calculation method based on infrared star catalogue |
| CN106595645A (en) * | 2016-11-02 | 2017-04-26 | 上海航天控制技术研究所 | Method for making guide star database based on output accuracy of star sensors |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106055700A (en) * | 2016-06-16 | 2016-10-26 | 中国科学院国家天文台 | Infrared band flux expansion calculation method based on infrared star catalogue |
| CN106055700B (en) * | 2016-06-16 | 2019-07-19 | 中国科学院国家天文台 | A kind of infrared band flow expansion calculation method based on infrared star catalogue |
| CN106595645A (en) * | 2016-11-02 | 2017-04-26 | 上海航天控制技术研究所 | Method for making guide star database based on output accuracy of star sensors |
| CN109540129A (en) * | 2018-11-30 | 2019-03-29 | 上海航天控制技术研究所 | A kind of production method of machine-carried type round-the-clock star sensor navigation star database |
| CN109540129B (en) * | 2018-11-30 | 2020-10-20 | 上海航天控制技术研究所 | Method for manufacturing airborne all-time star sensor navigation star library |
| CN110285808A (en) * | 2019-07-10 | 2019-09-27 | 北京航空航天大学 | A kind of instrument magnitude conversion method for star sensor based on infinite dimensional space |
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