Method for on-orbit optimization of imaging parameters of TDI CCD camera

A technology of imaging parameters and optimization methods, applied in the field of aerospace optical remote sensing, can solve the problems of wrong parameter setting, long time consumption, complicated calculation process, etc., and achieves the effect of high accuracy, convenient software implementation, and avoiding the phenomenon of wrong parameter setting.

Active Publication Date: 2013-09-25
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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Problems solved by technology

[0005] In addition, the existing technology is mainly based on the radiation calibration test data of the camera combined with the atmospheric calculation software to obtain parameter setting suggestions. This algorithm needs to manually calculate the parameter combination according to the calculation steps. Parameter setting errors caused by errors

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  • Method for on-orbit optimization of imaging parameters of TDI CCD camera
  • Method for on-orbit optimization of imaging parameters of TDI CCD camera
  • Method for on-orbit optimization of imaging parameters of TDI CCD camera

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Embodiment Construction

[0040] Such as figure 1 Shown, the realization process of the present invention is:

[0041] 1) According to the latitude of the current imaging area The solar declination angle δ and solar hour angle t at the current imaging moment are used to calculate the solar altitude angle h. The specific calculation formula is:

[0042]

[0043] The specific formula for calculating the solar declination angle δ is:

[0044] δ=arcsin(0.398sin(S L ));

[0045] S L =4.87+0.0175d+0.033sin(0.0175d);

[0046] d=30(m-1)+m d ;

[0047] In the formula, d is the order of the day, m is the month, and m d for the day of the month.

[0048] The solar hour angle t is 0° at 12:00 local time, plus +15° every hour before and after.

[0049] According to the above method, the solar altitude angle and solar zenith angle at any point (longitude, latitude) on the earth at any time (year, month, day, hour, minute, second) can be calculated.

[0050] 2) Count the existing satellite image data of ...

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Abstract

The invention discloses a method for on-orbit optimization of imaging parameters of a TDI CCD camera. The method is suitable for different imaging conditions. The method comprises the following steps of 1, aiming at a season change, building a global ground feature reflectivity database by an acquired satellite image, 2, making solar spectral radiance and integrating sphere spectral radiance equivalent by normalized responsibility of a camera system, and acquiring a relationship between a camera system output and apparent radiance according to a radiometric calibration test result, and 3, by the global ground feature reflectivity database and a solar altitude change, acquiring a camera parameter arrangement suggestion by the above computed result. Aiming at different ground feature objects and imaging conditions, the method can realize real time calculation of TDI integration class and gain and provide the calculation result for a user. The method guarantees accuracy, real-time performances and reliability of on-orbit parameter arrangement and improves on-orbit imaging performances and image quality of an optical remote sensor.

Description

technical field [0001] The invention relates to an on-orbit optimization method for imaging parameters of a TDICCD camera, belonging to the technical field of aerospace optics and remote sensing. Background technique [0002] For TDI CCD cameras, there are many adjustable parameters, such as integration time, integration series and gain. For the integration time, it needs to be adjusted according to the orbit height, roll angle and latitude. Therefore, the on-orbit optimization of TDI CCD camera parameters is mainly a matter of rational use of TDI series and gain. [0003] Through statistics and analysis of remote sensing satellite image quality, it is found that in the same orbit satellite image, under the same camera parameter settings, the brightness of satellite images in different regions varies greatly. Some image layers are very rich, and some image layers are concentrated on a few gray levels. In the same image, due to different observation targets, when the gray ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C11/02H04N5/232
Inventor 何红艳李方琦齐文雯鲍云飞周虎
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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