CN1641374A - Satellite full optical-path radiation beaconing method - Google Patents

Abstract

The invention discloses an on-satellite all-light path radioactive calibrating method, including high accuracy spectrum radioactive brightness meter satellite-carried multi-spectrum camera and bracket installed on a satellite platform, where the bracket is installed with motor-driven diffuse reflecting white plate, the above brightness meter and the satellite-carried multi-spectrum camera are installed on the same plane on the satellite platform and the directions of their light paths are the same, it uses a rotating motor to drive the above white plate rotationally move rightward to avoid the light path of the multi-spectrum camera, and here, this camera can relatively obverse earth object; once the white plate rotationally restores to actual shown position, it can realize all-light path calibration for the multi-spectrum camera. It can realize high accuracy calibration for on-satellite camera response by uncertainty less than 3%.

Description

Satellite full optical-path radiation beaconing method

Technical field

The invention belongs to the optical radiation fields of measurement, a kind of specifically satellite full optical-path radiation beaconing method.

Background technology

At present, satellite application is just more and more goed deep into aspect of social life.Only,,, weather satellite, landsat and the seasat etc. of telstar, wind and cloud series are just arranged as civilian except the reconnaissance satellite of military purpose in China.Wherein except telstar, other satellite can be referred to as remote sensing satellite, and the optical sensor of imaging or non-imaging all is housed without exception, obtains the image or the spectral information of sky, ground and ocean target with this.All optical instruments for the information that makes acquisition has true and reliable property, all carried out the calibration calibration on ground before launching.Yet, in case after the lift-off, owing to residing environmental aspect has greatly changed and As time goes on is subjected in various degree pollution and aging, some more or less all can take place and change in the responsiveness of detector, thereby the authenticity of the information of obtaining is affected.In fact, the wind and cloud satellite of China, landsat etc. all have this situation.In order to address this problem, generally all to install interior robot scaling equipment (scaler of making light source by bromine tungsten filament lamp) on the star additional or utilizing ground target (as the Chinese remote sensing satellite radiant correction field in Dunhuang) that the pertinent instruments on the star is calibrated calibration.

Interior robot scaling equipment on the star usually can only be to being carried out the calibration calibration of part light path by the instrument calibrated, thereby all can not calibrate the precision that influence is calibrated to the primary mirror of camera as general; Simultaneously bromine tungsten filament lamp is made light source along with the passing of environmental change and time, and its output inevitably will change, and the so just feasible precision of calibrating of calibrating is difficult to product and estimates; The ground target is restricted owing to the influence that is subjected to atmosphere makes the precision of calibration, and present level only can reach about 90%.

For the more and more higher requirement of the quantification demand of modern remote sensing application, the more existing apparatus and method that optical sensor on the star the is calibrated calibration relative deficiency that seemed.

Summary of the invention

In order to improve calibration calibration accuracy to optical sensor on the star, satisfy the demand of modern quantification remote sensing, the present invention has invented satellite full optical-path radiation beaconing method.

Technical scheme

Satellite full optical-path radiation beaconing method, it is characterized in that high precision spectral radiance meter is installed successively on satellite platform, wait to calibrate spaceborne multispectral camera, by motor-driven rotatable diffuse reflection blank, high precision spectral radiance meter and multispectral camera can be measured same target one diffuse reflection blank simultaneously; When needing calibration, by the input path of surface instruction motor-driven diffuse reflection blank rotation incision high precision spectral radiance meter and multispectral camera, this moment, high precision spectral radiance meter and multispectral camera were measured the satellite full optical-path radiation beaconing that the diffuse reflection blank is realized the spectrum camera simultaneously; After the calibration task is finished, drive the rotation of diffuse reflection blank by the surface instruction rotary electric machine again and move the light path of avoiding multispectral camera, this moment, multispectral camera promptly recovered the observation to earth target;

High precision spectral radiance meter and multispectral camera be measurement target diffuse reflection blank simultaneously, can guarantee that like this target emanation brightness that both are received at synchronization is identical,

After measuring, multispectral camera is at the responsiveness R of a certain wave band _λCan obtain by following formula:

Because $L_{\mathrm{\λ}}=\frac{V_{0\mathrm{\λ}}}{R_{0\mathrm{\λ}}}=\frac{V_{\mathrm{\λ}}}{R_{\mathrm{\λ}}}$

So $R_{\mathrm{\λ}}=R_{0\mathrm{\λ}}\×\frac{V_{\mathrm{\λ}}}{V_{0\mathrm{\λ}}}$

Wherein: L _λSpoke brightness on the-diffuse reflection blank;

V _{0 λ}-high precision spectral radiance meter is at the magnitude of voltage of λ wavelength place output;

V _λ-camera is at the magnitude of voltage of λ wavelength place output;

R _{0 λ}-high precision spectral radiance meter is in the responsiveness at λ wavelength place;

R by calibration acquisition on star _λWith the multispectral camera of ground calibration gained before the satellites transmits responsiveness R at a certain wave band _λ' the data that obtained of proportionate relationship correction multispectral camera observation earth target promptly realize calibration calibration to multispectral camera.

Rotatable diffuse reflection blank by motorized motions is installed on the support of satellite platform, and high precision spectral radiance meter and spaceborne multispectral camera are installed on the same plane on the satellite platform, and its optical path direction is all to same direction.

High precision spectral radiance meter adopts patented technology, and its patent No. is: ZL03 2 20050.1.

Though the sunshine in the outer space is highly stable, the diffuse reflection blank adopts the polytetrafluoroethylene material through special technology to fire making, itself have excellent in chemical and physical stability, but in the medium-term and long-term operation of space, its exposed optical surface unavoidably will be subjected to the pollution of Dust in Space and be subjected to strong ultraviolet irradiation and change its surperficial spectral reflectivity, thereby makes the emittance that enters camera become unpredictable and can not realize precise calibration calibration to camera.For this reason, the present invention is installed 03 2 20050.1 high precision spectral radiance meter utility model patents additional by the precise calibration of matching measurement realization to camera.

High precision spectral radiance meter with wait to calibrate camera measurement target (diffuse reflection blank) simultaneously, can guarantee that like this target emanation brightness that both are received at synchronization is identical, thereby eliminate because the error that temporal differences is brought.

Effect of the present invention

This satellite full optical-path radiation beaconing method can carry out the calibration of full light path to the camera that needs the calibration calibration on the star, has eliminated the limitation of part light path robot scaling equipment in the past; Utilize high precision, the high stability of high precision spectral radiance meter can realize camera responsiveness on the star is carried out uncertainty less than 3% high-precision fixed calibration standard.

Description of drawings

Accompanying drawing 1 is the example schematic diagram of specific implementation of the present invention.

Accompanying drawing 2 is a principle of work synoptic diagram of the present invention.

Embodiment

Referring to accompanying drawing 1,2.

Satellite full optical-path radiation beaconing method, comprise the high precision spectral radiance meter that is installed on the satellite platform, spaceborne multispectral camera and support, be equipped with on the support by motor-driven diffuse reflection blank, high precision spectral radiance meter and spaceborne multispectral camera are installed on the same plane on the satellite platform, its optical path direction is all to same direction, drive the diffuse reflection blank by rotary electric machine and move the light path (as moving on to position shown in the dotted line) of avoiding multispectral camera to right rotation, this moment, multispectral camera can be observed earth target; In case the rotation of diffuse reflection blank is returned to position shown in the solid line, can realize full light path calibration calibration to multispectral camera.

Claims (1)

1, satellite full optical-path radiation beaconing method, it is characterized in that high precision spectral radiance meter is installed successively on satellite platform, wait to calibrate spaceborne multispectral camera, by motor-driven rotatable diffuse reflection blank, high precision spectral radiance meter and multispectral camera can be measured same target-diffuse reflection blank simultaneously; When needing calibration, by the input path of surface instruction motor-driven diffuse reflection blank rotation incision high precision spectral radiance meter and multispectral camera, this moment, high precision spectral radiance meter and multispectral camera were measured the satellite full optical-path radiation beaconing that the diffuse reflection blank is realized the spectrum camera simultaneously; After the calibration task is finished, drive the rotation of diffuse reflection blank by the surface instruction rotary electric machine again and move the light path of avoiding multispectral camera, this moment, multispectral camera promptly recovered the observation to earth target;

High precision spectral radiance meter and multispectral camera be measurement target diffuse reflection blank simultaneously, can guarantee that like this target emanation brightness that both are received at synchronization is identical,

After measuring, multispectral camera can be obtained by following formula at the responsiveness R of a certain wave band λ:

Because $L_{\mathrm{\λ}}=\frac{V_{0\mathrm{\λ}}}{R_{0\mathrm{\λ}}}=\frac{V_{\mathrm{\λ}}}{R_{\mathrm{\λ}}}$

So $R_{\mathrm{\λ}}=R_{0\mathrm{\λ}}\×\frac{V_{\mathrm{\λ}}}{V_{0\mathrm{\λ}}}$

Wherein: L _λSpoke brightness on the-diffuse reflection blank;

V _{0 λ}-high precision spectral radiance meter is at the magnitude of voltage of λ wavelength place output;

V _λ-camera is at the magnitude of voltage of λ wavelength place output;

R _{0 λ}-high precision spectral radiance meter is in the responsiveness at λ wavelength place;

R by calibration acquisition on star _λWith the multispectral camera of ground calibration gained before the satellites transmits responsiveness R at a certain wave band _λ' the data that obtained of proportionate relationship correction multispectral camera observation earth target promptly realize calibration calibration to multispectral camera.