Drift angle distribution and image quality decreasing of solar synchronizing elliptic orbit

Sun Yang; Yan Feng; Xue Donglin; Wang Xiaokun; Zhang Xuejun

Drift angle distribution of elliptic solar synchronic orbit was discussed with an image simulating method based on orbit elements and TDICCD imaging mechanism. Image quality was evaluated based on PSF distribution of the simulated final image, and drift angle calculation was carried out. Results show that drift angle of elliptic orbit is linear to half -major -axis and cubic polynomial to orbit eccentricity when argument of perigee is 0. Image quality distribution aimed at KH-12 camera's critical inclination orbit due to angle drifting in case MTF 0.95 was discussed. Results show that smaller drift angle at neighborhood of the perigee of elliptic orbit and higher image quality can be achieved under same integral number.

1. Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;

2. University of Chinese Academy of Sciences,Beijing 100049,China

Received Date: 2012-07-22

Rev Recd Date: 2012-08-19

Publish Date: 2013-03-25

Key words:

Abstract: Drift angle distribution of elliptic solar synchronic orbit was discussed with an image simulating method based on orbit elements and TDICCD imaging mechanism. Image quality was evaluated based on PSF distribution of the simulated final image, and drift angle calculation was carried out. Results show that drift angle of elliptic orbit is linear to half -major -axis and cubic polynomial to orbit eccentricity when argument of perigee is 0. Image quality distribution aimed at KH-12 camera's critical inclination orbit due to angle drifting in case MTF 0.95 was discussed. Results show that smaller drift angle at neighborhood of the perigee of elliptic orbit and higher image quality can be achieved under same integral number.

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Drift angle distribution and image quality decreasing of solar synchronizing elliptic orbit

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