Acta Optica Sinica, Volume. 31, Issue 9, 900115(2011)
Two Bore-Sight Stereo Mapping with Single Lens, TDI CCD Pushing Model Imaging and Compensations of the Speed-to-Height Rate —— Chang′e-2 CCD Camera
The synthetic technical option of two bore-sight stereo mapping with single lens, the time delayed and integration (TDI) CCD pushing model imaging and the compensations technique of the speed-to-height rate of Chang′e-2 satellite TDI CCD stereo camera is proposed. It is the first time to employ two TDI CCD as imaging sensors and obtain clear image with high spatial resolution. In order to keep the synchronism between the optical image motion speed on the focal plane array (FPA) and the electronic latent image motion speed during pushing imaging with TDI CCD camera, two speed-to-height rates compensation methods are used: line frequency injection from the ground station and laser altimeter aided line frequency calculation. The camera′s mean modulation transfer function is bigger than 0.4 which is tested before the launch. Because of the optimal design, careful fabrication and precise installation, accuracy requirement of on-orbit speed-to-height rate compensation is relaxed. Because technical measures are synthetically used in TDI CCD camera, clear stereo images of the global lunar surface with resolution of 7 m, the highest spatial resolution global images, and the clear images of Sinus Iridum with about 1.3 m resolution on the near-moon-arc of the 15 km×100 km ellipsoid orbit are both obtained. The capability of obtaining high spatial resolution stereo imaging of lunar surface is achieved.
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Zhao Baochang, Wen Desheng, Yang Jianfeng, Gao Wei, Chang Lingying, Xue Bin, Song Zongxi. Two Bore-Sight Stereo Mapping with Single Lens, TDI CCD Pushing Model Imaging and Compensations of the Speed-to-Height Rate —— Chang′e-2 CCD Camera[J]. Acta Optica Sinica, 2011, 31(9): 900115
Category: Reviews
Received: Jul. 27, 2011
Accepted: --
Published Online: Aug. 29, 2011
The Author Email: Baochang Zhao (bczhao@opt.ac.cn)