CN109974859B - On-orbit automatic calibration method for visible short wave infrared camera - Google Patents
On-orbit automatic calibration method for visible short wave infrared camera Download PDFInfo
- Publication number
- CN109974859B CN109974859B CN201910125865.3A CN201910125865A CN109974859B CN 109974859 B CN109974859 B CN 109974859B CN 201910125865 A CN201910125865 A CN 201910125865A CN 109974859 B CN109974859 B CN 109974859B
- Authority
- CN
- China
- Prior art keywords
- infrared camera
- short wave
- wave infrared
- calibration
- shadow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000005855 radiation Effects 0.000 claims abstract description 12
- 238000001228 spectrum Methods 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000005286 illumination Methods 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000001429 visible spectrum Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000013332 literature search Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/80—Calibration
Abstract
The invention relates to an on-orbit automatic calibration method of a visible short wave infrared camera, belonging to the technical field of on-orbit calibration, and the method comprises the following steps: after a satellite is launched into orbit, a visible short wave infrared camera receives broadcast information of 'shadow out' and 'shadow in' sent by the satellite in the same orbit, and calculates the time length of a shadow area; secondly, the satellite sends an on-orbit calibration instruction to the visible short wave infrared camera, and after the visible short wave infrared camera receives the 'shadow entering' broadcast information again, the visible short wave infrared camera starts to count down the duration of a shadow area and switches to a dark background measurement and internal calibration mode; thirdly, the visible short wave infrared camera counts down according to the duration of the shadow region, and the solar calibration preparation work is completed before the shadow region is finished; and fourthly, completing solar spectrum calibration in the satellite irradiation period when the sun penetrates through the atmosphere, completing solar radiation calibration in the satellite direct irradiation period, and entering a standby mode after completion. The invention can obtain accurate calibration data.
Description
Technical Field
The invention relates to the technical field of on-orbit calibration, in particular to an on-orbit automatic calibration method for a visible short wave infrared camera.
Background
After the satellite is launched and put into orbit, the camera needs to receive a working instruction sent by the satellite to start the corresponding function. Camera on-track calibration is generally divided into links such as dark background measurement, internal light source calibration, sun calibration (including solar spectrum calibration and radiometric calibration) and the like, and in order to avoid introducing the influence of sun or earth-atmosphere stray light, the dark background measurement and the internal light source calibration need to be carried out in a shadow region; when the satellite just comes out of shadow, solar rays penetrate through the atmosphere and enter the visible short wave infrared camera, and solar spectrum calibration can be carried out; with the on-orbit operation of the satellite, the solar rays are converted into direct incidence inside the visible short-wave infrared camera, the solar radiation energy is not absorbed and influenced by atmospheric components, and the solar radiation calibration can be carried out. Therefore, the solar calibration preparation is completed before the shadow is made, otherwise it is likely that the effective solar calibration period will be missed. In order to complete the on-orbit calibration of the camera orderly and on time, the ground station is required to calculate the triggering time and related instructions of each link respectively and inject the triggering time and related instructions into the satellite digital tube computer in advance. The on-orbit calibration task fails due to the fact that the triggering time calculation deviation of each link is large or related instructions are sent wrongly; if the satellite has the function of 'one key' starting the camera to calibrate in orbit, each calibration link can be completed quickly and error-free, and calibration data can be obtained accurately on time.
Through the literature search of the prior art, the chinese invention patent 201611192370.5 discloses the following contents: the on-orbit geometric calibration of the satellite is a key link for realizing high-precision geometric positioning of the optical remote sensing satellite, and directly influences the internal and external geometric precision of the satellite image. Although the satellite is strictly calibrated in a laboratory before being launched, the geometric imaging parameters of the satellite are changed due to the influences of factors such as vibration in the launching process, material deflation, change of imaging conditions during in-orbit running, aging of devices and the like, and the ground calibration value cannot meet the requirement of high-precision geometric processing, so that in-orbit calibration of the satellite is required. In order to ensure that the external positioning precision, the internal geometric precision, the fusion precision and the waveband registration precision of an image product are provided for a user, the technical problem of high-precision on-orbit geometric calibration of a high-orbit area array camera needs to be solved urgently. However, the prior art does not give corresponding technical disclosure for the on-orbit automatic calibration method by using the visible short wave infrared camera.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an on-orbit automatic calibration method for a visible short wave infrared camera, which can realize the on-orbit calibration function of a camera started by one key on a satellite.
The invention is realized by the following technical scheme, and relates to an on-orbit automatic calibration method for a visible short wave infrared camera, which comprises the following steps of:
after a satellite is launched into orbit, a visible short wave infrared camera receives broadcast information of 'shadow out' and 'shadow in' sent by the satellite in the same orbit, and calculates the time length of a shadow area;
secondly, the satellite sends an on-orbit calibration instruction to the visible short wave infrared camera, after the visible short wave infrared camera receives the 'shadow entering' broadcast information again, the visible short wave infrared camera starts to count down the duration of a shadow area, and then the visible short wave infrared camera enters a dark background measurement and internal calibration mode, and then the visible short wave infrared camera enters a standby mode after the counting is finished;
thirdly, the visible short wave infrared camera counts down according to the duration of the shadow region, and the solar calibration preparation work is completed before the shadow region is finished;
step four, when the time countdown of the shadow area is zero, namely the shadow moment is taken out, the visible short wave infrared camera automatically enters a solar calibration flow, the illumination area timing is started, and the solar spectrum calibration is completed in the time period when the sun irradiates the satellite through the atmosphere; and finishing solar radiation calibration in the time period when the sun directly irradiates the satellite, and entering a standby mode after the solar radiation calibration is finished.
Preferably, in the step one, the length of the shadow area is calculated and iterated for each track.
Preferably, in the second step, the duration of the shadow area is counted down, and since the difference between the durations of the shadow areas of two adjacent tracks is in the range of several milliseconds to several tens milliseconds, the error is negligible, and the duration of the shadow area of the previous track should be selected for counting down.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a brand new on-orbit calibration method for a visible short wave infrared camera;
2. in the method, the satellite only sends an on-orbit calibration instruction of the visible short wave infrared camera, the visible short wave infrared camera can automatically execute the whole calibration process, and particularly, the visible short wave infrared camera accurately calculates the shadow time of the satellite according to the countdown of a shadow area, prepares in advance before the shadow is formed, and automatically switches to a solar calibration process to obtain accurate calibration data.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of an on-orbit automatic calibration process of a visible short wave infrared camera;
fig. 2 is a schematic diagram of an on-track calibration key moment of a visible short wave infrared camera.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Examples
In the embodiment, the on-orbit automatic calibration method for the visible short wave infrared camera comprises the following steps: after the satellite is launched into orbit, the visible short wave infrared camera receives the broadcast information of 'shadow out' and 'shadow in' sent by the satellite in the same orbit, and calculates the time length of a shadow area; the method comprises the steps that a satellite sends an on-orbit calibration instruction to a visible short wave infrared camera, after the visible short wave infrared camera receives 'shadow entering' broadcast information again, the visible short wave infrared camera starts time length countdown of a shadow area, and enters a dark background measurement and internal calibration mode, and then enters a standby mode; the visible short wave infrared camera counts down according to the duration of the shadow region, and completes the solar calibration preparation work before the shadow region is finished; when the time countdown of the shadow area is zero, namely the shadow moment is taken out, the visible short wave infrared camera automatically enters a solar calibration process, the illumination area timing is started, and the solar spectrum calibration is completed in the time period when the sun irradiates the satellite through the atmosphere; and finishing solar radiation calibration in the time period when the sun directly irradiates the satellite, and entering a standby mode after the solar radiation calibration is finished.
The following provides a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. As shown in fig. 1, the on-orbit automatic calibration method for the visible short wave infrared camera of the invention comprises the following steps:
after a satellite is launched into orbit, a visible short wave infrared camera receives 'shadow-out' and 'shadow-in' broadcast information sent by the satellite in the same orbit, and calculates the time length of a shadow area;
secondly, the satellite sends an on-orbit calibration instruction to the visible short wave infrared camera, after the visible short wave infrared camera receives the 'shadow entering' broadcast information again, the visible short wave infrared camera starts to count down the duration of a shadow area, and then the visible short wave infrared camera enters a dark background measurement and internal calibration mode, and then the visible short wave infrared camera enters a standby mode after the counting is finished;
thirdly, the visible short wave infrared camera counts down according to the duration of the shadow region, and the solar calibration preparation work is completed before the shadow region is finished;
step four, when the time countdown of the shadow area is zero, namely the shadow moment is taken out, the visible short wave infrared camera automatically enters a solar calibration flow, the illumination area timing is started, and the solar spectrum calibration is completed in the time period when the sun irradiates the satellite through the atmosphere; and finishing solar radiation calibration in the time period when the sun directly irradiates the satellite, and entering a standby mode after the solar radiation calibration is finished.
Preferably, the length of the shadow area in the step one is calculated and iterated for each track.
Preferably, in the step two, the duration of the shadow area is counted down, and since the difference between the durations of the shadow areas of two adjacent tracks is within a range from several milliseconds to several tens milliseconds, the error is negligible, and the duration of the shadow area after the iteration of the previous track should be selected for counting down.
The following further describes the present embodiment with reference to the drawings, and the present embodiment implements the satellite on-orbit calibration function of the visible short wave infrared camera that can be started by one key.
As shown in FIG. 2, after a satellite enters an orbit, a satellite counting tube computer sends ' shadow entering ' and ' shadow exiting ' broadcast information to a visible short wave infrared camera every orbit according to the shadow entering/exiting state, the moment when the ' shadow entering ' broadcast information is received is marked as T0, an internal timer 1 of the visible short wave infrared camera is cleared and starts to time, the moment when the ' shadow exiting ' broadcast information is received is marked as T1, the internal timer 1 stops timing, the total duration △ T0 counted by the internal timer 1 shows that the duration of a shadow area of the orbit is △ T0., the moment when the sun light cuts the atmosphere and irradiates the satellite is marked as T2, the time periods from T1 to T2 can carry out solar spectrum calibration, and the moment when the satellite runs at the time periods from T1 to T2, △ T0 ' and the moment when the T2 can carry out solar radiation calibration.
When the on-orbit calibration task of the visible short wave infrared camera needs to be executed, the satellite sends an on-orbit calibration instruction of the visible short wave infrared camera, when the visible short wave infrared camera receives 'enter shadow' broadcast information, the internal timer 2 starts countdown from △ T0, the imaging circuit of the visible short wave infrared camera is powered on, different imaging parameters (integration time, gain and the like) are set to image a dark background respectively, after the completion, the internal calibration light source of the visible short wave infrared camera is started, the internal calibration light source is switched into a light path by using a calibration mechanism, different imaging parameters are set to image the internal calibration light source respectively, after the completion, the visible short wave infrared camera enters a standby mode, if the solar calibration preparation work consumes △ T1, when the internal timer 2 is changed from △ T0 to △ T1, the imaging circuit is powered on, different imaging parameters are set to image the dark background respectively, after the completion, the transmission of the remote sensing data of the visible short wave infrared camera is stopped, the diffuse reflector is switched into the light path by using the remote sensing calibration mechanism, the solar calibration work is completed, when the countdown of the internal timer 2 is 0, the visible short wave infrared camera enters the visible spectrum 638, when the visible spectrum calibration work is started, the remote sensing camera starts, the visible spectrum calibration data transmission of the infrared camera, the infrared camera enters the visible spectrum 638, the infrared camera enters the visible spectrum calibration work of the visible spectrum 638, when the infrared camera, the infrared calibration work of the remote sensing camera, the visible spectrum 638, the infrared camera starts when the infrared camera, the infrared camera starts when the infrared camera, the infrared camera starts the infrared calibration work of the infrared camera, the.
In conclusion, the invention provides a brand-new on-orbit calibration method for the visible short wave infrared camera; in the method, the satellite only sends an on-orbit calibration instruction of the visible short wave infrared camera, the visible short wave infrared camera can automatically execute the whole calibration process, and particularly, the visible short wave infrared camera accurately calculates the shadow time of the satellite according to the countdown of a shadow area, prepares in advance before the shadow is formed, and automatically switches to a solar calibration process to obtain accurate calibration data.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (3)
1. An on-orbit automatic calibration method for a visible short wave infrared camera is characterized by comprising the following steps:
after a satellite is launched and put into orbit, a visible short wave infrared camera on the satellite receives 'shadow-out' and 'shadow-in' broadcast information sent by the satellite, and the time length of a shadow area is calculated;
secondly, the satellite sends an on-orbit calibration instruction to the visible short wave infrared camera, after the visible short wave infrared camera receives the 'shadow entering' broadcast information again, the visible short wave infrared camera starts to count down the duration of a shadow area, and then the visible short wave infrared camera enters a dark background measurement and internal calibration mode, and then the visible short wave infrared camera enters a standby mode after the counting is finished;
thirdly, the visible short wave infrared camera counts down according to the duration of the shadow region, and the solar calibration preparation work is completed before the shadow region is finished;
step four, when the time countdown of the shadow area is zero, namely the shadow moment is taken out, the visible short wave infrared camera automatically enters a solar calibration flow, the illumination area timing is started, and the solar spectrum calibration is completed in the time period when the sun irradiates the satellite through the atmosphere; completing solar radiation calibration in the time period when the sun directly irradiates the satellite, and entering a standby mode after completing the solar radiation calibration;
the shadow area is a shadow area formed after sunlight directly irradiates the earth.
2. The visible shortwave infrared camera in-orbit automatic calibration method of claim 1, wherein in the first step, the shadow region duration is calculated, and each orbit of the satellite needs to be calculated and iterated.
3. The on-orbit automatic calibration method for the visible short wave infrared camera of claim 1, wherein in the second step, the duration of the shadow area of the visible short wave infrared camera is counted down, and since the duration of the shadow area of the two adjacent orbits of the satellite is different from each other within a range of several milliseconds to tens of milliseconds, the error is ignored, and the duration of the shadow area of the last orbit of the satellite is selected for counting down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910125865.3A CN109974859B (en) | 2019-02-20 | 2019-02-20 | On-orbit automatic calibration method for visible short wave infrared camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910125865.3A CN109974859B (en) | 2019-02-20 | 2019-02-20 | On-orbit automatic calibration method for visible short wave infrared camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109974859A CN109974859A (en) | 2019-07-05 |
| CN109974859B true CN109974859B (en) | 2020-07-28 |
Family
ID=67077047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910125865.3A Active CN109974859B (en) | 2019-02-20 | 2019-02-20 | On-orbit automatic calibration method for visible short wave infrared camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109974859B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112284535A (en) * | 2020-09-15 | 2021-01-29 | 中国科学院上海技术物理研究所 | Dark background removing method for progressive on-orbit push-scan type medium-short wave infrared imaging spectrometer |
| CN116907547B (en) * | 2023-09-12 | 2023-11-17 | 北京控制工程研究所 | On-orbit dynamic calibration method, device, equipment and medium for aircraft gyroscope |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4102575B2 (en) * | 2002-03-05 | 2008-06-18 | Ｎｅｃ東芝スペースシステム株式会社 | Spacecraft attitude change control device and attitude change control method |
| CN102436394B (en) * | 2011-11-15 | 2013-06-19 | 北京空间飞行器总体设计部 | Satellite entry-exit independent telemetry processing control method |
| CN105928525B (en) * | 2016-04-25 | 2018-08-07 | 航天东方红卫星有限公司 | A kind of attitude determination method that satellite calibrates the moon |
| CN107315182B (en) * | 2017-05-17 | 2020-07-14 | 上海卫星工程研究所 | Passive positioning load positioning capability test method based on semi-physical simulation |
-
2019
- 2019-02-20 CN CN201910125865.3A patent/CN109974859B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109974859A (en) | 2019-07-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109974859B (en) | On-orbit automatic calibration method for visible short wave infrared camera | |
| Code et al. | Ultraviolet photometry from the Orbiting Astronomical Observatory. I. Instrumentation and operation | |
| Auvergne et al. | The CoRoT satellite in flight: description and performance | |
| Hogg et al. | A Photometricity and extinction monitor at the Apache Point Observatory | |
| CN103322982B (en) | On-track space camera gain regulating method | |
| Kaaret et al. | Chandra Observations of the Young Pulsar PSR B0540–69 | |
| DE3275765D1 (en) | Electronic watch provided with detection means for the passage across a reference position | |
| CN103344222B (en) | Method for automatically adjusting space camera gain in real time | |
| Abe et al. | Developments and results in the context of the JEM-EUSO program obtained with the ESAF simulation and analysis framework | |
| Cawley et al. | Application of imaging to the atmospheric Cherenkov technique | |
| Gordon et al. | A TV‐scanning method for recording time‐resolved optical spectra of transients produced by a single pulse of electrons | |
| Kaufmann et al. | Solar submillimeter and gamma-ray burst emission | |
| US3427453A (en) | System for switching the attitude reference of a satellite from a first celestial body to a second celestial body | |
| Hill et al. | The unique observing capabilities of the Swift X-ray telescope | |
| CN205748641U (en) | The push-broom type UAV system high spectrum image survey meter corrected with synchrotron radiation | |
| CN113503965B (en) | Method for realizing synchronous imaging of satellite-borne imaging spectrometer by using satellite platform second pulse | |
| Lohsen | Period variations of the white dwarf eclipsing binary BD+ 16 516. | |
| Sacco et al. | Observation of the VELA pulsar, PSR 0833-45, at 0.2-6.0 MeV with the FIGARO II experiment | |
| Ubertini et al. | Hard X-ray spectrum of Supernova 1987A on day 407 | |
| US20130320189A1 (en) | Solar tracking system using peridic scan patterns with a shielding tube | |
| Cramer et al. | A novel apparatus to measure reflected sunlight from the Moon | |
| Mignani et al. | Search for the optical counterpart of the 16ms X-ray pulsar in the LMC | |
| Meng et al. | The application of single photon detector technique in laser time transfer for Chinese navigation satellites | |
| Mösbauer | Setup of an optical system for autonomous surveillance of orbital objects | |
| Ventura et al. | Evidence for low-energy γ-ray emission close to CG135+ 1 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |