CN104458591B - A kind of in-orbit spectrum calibration method of color dispersion-type spectrum imaging system - Google Patents
A kind of in-orbit spectrum calibration method of color dispersion-type spectrum imaging system Download PDFInfo
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- CN104458591B CN104458591B CN201410727345.7A CN201410727345A CN104458591B CN 104458591 B CN104458591 B CN 104458591B CN 201410727345 A CN201410727345 A CN 201410727345A CN 104458591 B CN104458591 B CN 104458591B
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Abstract
The present invention relates to a kind of in-orbit spectrum calibration methods of color dispersion-type spectrum imaging system, it is embodied as being laid with LED targets group and power supply on ground, LED targets group provides characteristic spectrum, it is made of in LED target groups the narrow-band LED of n different wave length, using detector in color dispersion-type optical spectrum imagers to the response data of the narrow-band LED of each wavelength, a Gaussian curve is obtained, the position that is responded on the detector using the center of Gaussian curve as the narrow-band LED of this wavelength calculates the line displacement amount in step 3；According to the position of the narrow-band LED of obtained different wave length on the detector, with the position versus obtained by Laboratory Calibration, the two subtracts each other to obtain the line displacement amount of each wavelength on the detector, determines the centre wavelength position of each spectrum channel.The present invention have the advantages that it is quick, effectively, low cost, and condition is influenced when not crossed top region as night by satellite.
Description
Technical field
The present invention relates to a kind of in-orbit spectrum calibration methods of color dispersion-type spectrum imaging system, belong to remotely sensed image technology neck
Domain.
Background technology
Spectral imaging technology can obtain while target optical spectrum and image information, after calibration, can make spectral information
Quantification, the information so as to be obtained by it identify target.According to the difference in calibration, calibration can be divided into spectrum and determine
Mark, relative radiometric calibration and absolute radiometric calibration, wherein absolute radiometric calibration are the key that quantification applications；According to implementation phase
Difference, calibration can be divided into Laboratory Calibration, field calibration and In-flight calibration.
In-flight calibration includes internal calibration and telluric lines is calibrated.Internal calibration needs to carry a large amount of calibration instrument, increases
Satellite weight, the period that all channels are scanned with needs is longer, under the space environment it cannot be guaranteed that calibration instrument in itself
It does not change, and needs the rotation by other components, light source is made to enter the visual field of camera, so have tumbler card
Danger that is stagnant, causing camera that cannot be imaged to the earth, and system hardware and software also can be extremely complex；When using Atmospheric Absorption
After line is emitted during spectral calibration, satellite is demarcated by calibration field areas (such as desert, ocean), can only be to indivedual several
A channel is demarcated, and needs to carry out in sunshine area, needs one kind just when the region that satellite passes through is in night
It takes, the instrument and method of light in-orbit spectral calibration.
Invention content
The technical problems to be solved by the invention：It solves the problems, such as in-orbit fast spectrum calibration, makes up what is passed through in satellite
The deficiency of spectral calibration is carried out when region is night, a kind of in-orbit spectrum calibration method of color dispersion-type spectrum imaging system is provided,
Have the advantages that it is quick, effective, inexpensive, and not by satellite cross top region be night when condition influenced.
The technology of the present invention solution：A kind of in-orbit spectrum calibration method of color dispersion-type spectrum imaging system, feature exist
It is as follows in realization step：
(1) LED targets group and power supply are laid on ground, LED targets group provides characteristic spectrum, in LED target groups by n not
The narrow-band LED composition of co-wavelength, 1<n<M, m be color dispersion-type optical spectrum imagers in spectrum channel number, the narrow-band LED of each wavelength
It is all corresponding with a certain spectrum channel in color dispersion-type optical spectrum imagers.LED targets group be laid with distribution form design considerations be
Ensure that detector necessarily connects there are one pixel in color dispersion-type optical spectrum imagers when being calibrated, when satellite passes through target region
The energy that LED is sent out is received, reaches the requirement of in-orbit spectral calibration；
(2) one is obtained to the response data of the narrow-band LED of each wavelength using detector in color dispersion-type optical spectrum imagers
Gaussian curve, the position that is responded on the detector using the center of Gaussian curve as the narrow-band LED of this wavelength calculate step 3
In line displacement amount；
(3) position of the narrow-band LED of different wave length on the detector has been obtained according to step (2), with Laboratory Calibration institute
The position versus obtained, the two subtract each other to obtain the line displacement amount of each wavelength on the detectorRepresent i-th of wavelength as λ
The line displacement amount of a spectrum channel.By their average valueAs estimating for color dispersion-type optical spectrum imagers line displacement amount
Meter,
(4) it is averaged line displacement amount according to the color dispersion-type optical spectrum imagers obtained in step 3Determine that each spectrum leads to
The centre wavelength position in road.
In the LED targets group every group by n different wave length narrowband (spectral bandwidth of narrow-band LED light source be less than 20nm,
The angle of divergence is less than 15 °) LED compositions, the centre wavelength of each narrow-band LED and the characteristic spectrum phase of color dispersion-type optical spectrum imagers
Match, it is desirable that n narrow-band LED enters in same pixel visual field simultaneously, it is contemplated that target and color dispersion-type optical spectrum imagers observation area
The error of domain relative position, places the distribution of 16 groups of targets, between two pairs between with being divided into color dispersion-type optical spectrum imagers first resolution ratio
Half.
The advantages of the present invention over the prior art are that：
(1) present invention utilizes the narrow-band LED of different wave length, it may be determined that the centre wavelength position of multiple spectrum channels carries
High calibration precision；
(2) present invention does not need to accurately be directed toward operation, it is only necessary to provide enough energy, you can so that color dispersion-type spectrum
Imager observes；
(3) present invention periodically can carry out in-orbit spectral calibration using LED target groups to color dispersion-type optical spectrum imagers.
Description of the drawings
Fig. 1 realizes flow chart for the in-orbit spectrum calibration method of the present invention；
Fig. 2 is LED targets group In-flight calibration method schematic diagram of the present invention；
Fig. 3 is LED target group arrangement modes in the present invention；
Fig. 4 is line drift mechanism；
Wherein：
21 be the satellite for carrying imaging spectrometer；
22 be atmosphere；
23 be ground；
24 be power supply；
25 be LED target groups；
26 push away for satellite and sweep direction；
31 be every group of LED target group being made of the narrow-band LED of n different wave length；
32 be the ground member resolution ratio of color dispersion-type optical spectrum imagers；
33 be the ground member resolution ratio of color dispersion-type optical spectrum imagers 1/2.
Specific embodiment
As shown in Figure 1, the method for the present invention realizes that step is：
Step 11 is laid with LED targets group 25 and power supply 24 on ground 23, and LED targets group 25 provides characteristic spectrum, power supply 24
It powers for target group.The satellite 21 for being loaded with color dispersion-type optical spectrum imagers operates in 22 top of atmosphere, is pushed away along satellite and sweeps direction 26
Region where LED targets group 25 push away sweeping, the design Main Basiss of 25 distribution form of LED targets group are to be calibrated
When, at process LED target 25 regions of group of satellite 21, pixel receives the energy that LED is sent out there are one guarantee detector certainty
Amount, reaches the requirement of in-orbit spectral calibration.Every group of narrow-band LED by n different wave length forms in LED target groups, each narrowband
The centre wavelength of LED and the characteristic spectrum of color dispersion-type optical spectrum imagers match, it is desirable that n narrow-band LED enters same simultaneously
In pixel visual field.
As shown in figure 3, on ground of the area for the ground member resolution ratio 32* color dispersion-type optical spectrum imagers of color dispersion-type optical spectrum imagers
On the region of first 32 size of resolution ratio, 16 groups every group LED targets group 31 being made of the narrow-band LED of n different wave length of placement
Target is distributed, it is contemplated that the error of target and color dispersion-type optical spectrum imagers viewing area relative position, between two pairs of targets between
Every the ground member resolution ratio 33 of color dispersion-type optical spectrum imagers 1/2.
Satellite 21 is pushed away along satellite to be swept after direction 26 to the region where LED targets group 25 push away and sweep, and satellite 21 is contained
Detector has response data to the narrow-band LED of each wavelength in color dispersion-type optical spectrum imagers.
Step 12 obtains a Gaussian curve after response data to be done to interpolation, using the center of Gaussian curve as this wave
The position that long narrow-band LED responds on the detector calculates the line displacement amount in step 13.
In-orbit spectral calibration based on LED targets group on ground is needed premised on the data of Laboratory Calibration, color dispersion-type
After optical spectrum imagers carry out spectrum calibration at different temperatures in laboratory, according to correlative study, the color at identical temperature
Scattered model varies less, it is believed that is constant.
As shown in figure 4, since the unknown factors such as vibrations cause the opposite variation of detector and prism location after lift-off, it may
The spatial position of spectral line is caused to move integrally, the dispersive power of prism is constant, then the light of different wave length is detecting after prism
Displacement on device all should be identical；
Step 13, the position according to the obtained narrow-band LED of different wave length on the detector, obtained by Laboratory Calibration
Position versus, the two subtract each other to obtain the line displacement amount of each wavelength on the detectorRepresent i-th light of the wavelength as λ
Compose the line displacement amount of channel.By their average valueAs the estimation of color dispersion-type optical spectrum imagers line displacement amount,
Step 14, be averaged line displacement amount according to obtained color dispersion-type optical spectrum imagersDetermine each spectrum channel
Centre wavelength position.
Above mentioned embodiment should not be construed as only as the exemplary illustration of technical solution of the present invention to this
The limitation of invention, any alternative solution that obvious part change is carried out to the present invention and is regarded as the present invention.It is this to replace
Include changing arrangement mode of the composition number of every group of narrow-band LED, LED target groups etc. in LED target groups for scheme.These changes
The essential scope of the present invention is not departed from variation.
Claims (1)
1. a kind of in-orbit spectrum calibration method of color dispersion-type spectrum imaging system, it is characterised in that realize that step is as follows：
(1) using LED target groups, in-orbit spectral calibration periodically is carried out to color dispersion-type optical spectrum imagers, LED targets are laid on ground
Group and power supply, LED targets group provide characteristic spectrum, are made of in LED target groups the narrow-band LED of n different wave length, each narrowband
The centre wavelength of LED and the characteristic spectrum of color dispersion-type optical spectrum imagers match, it is desirable that n narrow-band LED enters same simultaneously
In pixel visual field, 1<n<M, m be color dispersion-type optical spectrum imagers in spectrum channel number, narrow-band LED and the dispersion of each wavelength
A certain spectrum channel in type optical spectrum imagers corresponds to；The design considerations that LED targets group is laid with distribution form is to be calibrated
When, ensure that detector necessarily receives LED there are one pixel in color dispersion-type optical spectrum imagers when satellite passes through target region
The energy sent out reaches the requirement of in-orbit spectral calibration；(2) using detector in color dispersion-type optical spectrum imagers to each wavelength
The response data of narrow-band LED obtains a Gaussian curve, is being visited the center of Gaussian curve as the narrow-band LED of this wavelength
The position that responds is surveyed on device to calculate the line displacement amount in step (3)；
(3) narrow-band LED of different wave length is utilized, it may be determined that the centre wavelength position of multiple spectrum channels is obtained according to step (2)
The position of the narrow-band LED of different wave length on the detector is arrived, with the position versus obtained by Laboratory Calibration, the two subtracts each other to obtain
The line displacement amount of each wavelength on the detectorLine displacement amount of the wavelength as i-th of spectrum channel of λ is represented, it will
Their average valueAs the estimation of color dispersion-type optical spectrum imagers line displacement amount,
(4) it is averaged line displacement amount according to the color dispersion-type optical spectrum imagers obtained in step (3)Determine each spectrum channel
Centre wavelength position；The spectral bandwidth of the narrow-band LED light source is less than 20nm, and the angle of divergence is less than 15 °, and n narrow-band LED is simultaneously
Into in same pixel visual field, it is contemplated that target and the error of color dispersion-type optical spectrum imagers viewing area relative position are placed
The distribution of 16 groups of targets, between two pairs between with being divided into color dispersion-type optical spectrum imagers first resolution ratio half.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107631798A (en) * | 2017-09-12 | 2018-01-26 | 中国科学院长春光学精密机械与物理研究所 | The wavelength scaling method and system of push-broom type imaging spectrometer |
| CN108132064A (en) * | 2017-12-15 | 2018-06-08 | 吉林省远大光学检测技术有限公司 | The in-orbit absolute radiation calibration method of space optical remote sensor based on active illumination source |
| CN108444498B (en) * | 2017-12-29 | 2021-11-16 | 中国科学院长春光学精密机械与物理研究所 | High-contrast high-precision on-orbit geometric calibration system for space camera |
| CN108303118B (en) * | 2017-12-29 | 2022-03-18 | 中国科学院长春光学精密机械与物理研究所 | Space camera on-orbit radiometric calibration system and method based on active radiative illumination source |
| CN109655158B (en) * | 2019-01-10 | 2020-11-24 | 中国科学院上海技术物理研究所 | Hyperspectral remote sensor on-orbit spectrum calibration method based on atmospheric profile and LED |
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