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Rapid inverse transformation calculation method based on TDICCD push-broom characteristics

An inverse transformation and fast technology, applied in the aerospace field, can solve problems such as complex calculations and time-consuming, and achieve the effect of solving complex and time-consuming calculations

Active Publication Date: 2020-06-23
WUHAN UNIV
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Problems solved by technology

[0006] The present invention proposes a fast inverse transformation calculation method based on TDICCD push-broom characteristics, which is used to solve or at least partially solve the technical problems of complex calculation and long time-consuming existing in the existing inverse transformation method

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  • Rapid inverse transformation calculation method based on TDICCD push-broom characteristics
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  • Rapid inverse transformation calculation method based on TDICCD push-broom characteristics

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Embodiment Construction

[0044] The present invention proposes a fast back-calculation algorithm based on TDICCD push-broom characteristics, which is based on a strict geometric imaging model, starting from the essential characteristics of TDICCD push-broom imaging, and proposes a fast back-projection algorithm with "approximate vertical constraints", which can solve traditional back-projection problems. The transformation algorithm is computationally complex, time-consuming, and does not converge. In order to achieve the above object, the main idea of ​​the present invention is as follows:

[0045] Aiming at the delay-integral imaging characteristics of TDICCD push-broom images, an inverse transformation algorithm based on the "approximately vertical" constraint of the center boresight ground track of the field of view and the CCD array is proposed. Under the normal imaging conditions of TDICCD, the track of the visual axis of the center of the field of view on the ground should be approximately perp...

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Abstract

The invention discloses a rapid inverse transformation calculation method based on TDICCD push-broom characteristics, and provides an inverse transformation algorithm based on approximate vertical constraint of a view field center visual axis earth surface track and a CCD array aiming at delay integral imaging characteristics of a TDICCD push-broom image. The approximate imaging time t is calculated according to the working principle that the track of the central visual axis of the visual field of the TDICCD on the ground should be approximately perpendicular to the direction of the CCD underthe normal imaging condition of the TDICCD, then the imaging moment is obtained by correcting lens distortion and compensating drift angle residual errors, and back calculation is completed. The technical effect of improving the calculation efficiency and precision can be achieved.

Description

technical field [0001] The invention relates to the field of aerospace technology, in particular to a fast inverse transformation calculation method based on TDICCD push-broom characteristics. Background technique [0002] Optical remote sensing satellites can image the earth periodically and for a long time, and have the advantages of fast data acquisition and no regional restrictions, and have become an important means of earth observation. At present, optical remote sensing satellites at home and abroad mainly use the TDICCD push-broom imaging system to obtain remote sensing images with high resolution and high signal-to-noise ratio. Angle adjustment to ensure image quality. When TDICCD imaging mode is used for imaging, the inverse transformation of image coordinates calculated from ground coordinates needs to be realized by an iterative solution algorithm, which is complex, time-consuming and does not converge. [0003] In the process of implementing the present invent...

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Application Information

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IPC IPC(8): G06F17/15
CPCG06F17/15
Inventor 蒋永华张过昌明明
Owner WUHAN UNIV