Optical Design and Engineering

Precise alignment method of time-delayed integration charge-coupled device charge shifting direction in aerial panoramic camera

[+] Author Affiliations
Jian Zhang

Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, China

University of the Chinese Academy of Sciences, Beijing 100049, China

Chinese Academy of Sciences, Key Laboratory of Airborne Optical Imaging and Measurement, Changchun, Jilin 130033, China

Yalin Ding, Guoqin Yuan

Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, China

Chinese Academy of Sciences, Key Laboratory of Airborne Optical Imaging and Measurement, Changchun, Jilin 130033, China

Linghua Zhang, Haiying Tian

Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, China

Opt. Eng. 55(12), 125101 (Dec 08, 2016). doi:10.1117/1.OE.55.12.125101
History: Received July 19, 2016; Accepted November 16, 2016
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Abstract.  A time-delayed integration charge-coupled device (TDI CCD) in an aerial panoramic camera compensates the sweep image motion correctly on the premise that the TDI charge shifting direction is coincident with that of the sweep image motion. The coordinate transformation method is used to find out how the included angle between the two directions originated. Then the precise alignment method of the TDI charge shifting direction is proposed to eliminate the included angle. TDI CCD is operated in area mode, nodding the scan mirror, the trajectory of the image point is derived to be a hyperbola, which could be equivalent to an obliquely straight line. The tilt angle of the line is exactly the included angle between the two directions. Meanwhile, the tilt angle can be calculated by the least square method. Then the scan head or the focal plane assembly is precisely rotated to eliminate the included angle between the two directions. The assembling error after precise alignment is calculated at −16.4 s, which could hardly influence the MTF of TDI CCD. The panoramic imaging experiment and the flight test show that the precise alignment method is feasible and completely satisfies the operating requirement of the aerial panoramic camera.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Jian Zhang ; Yalin Ding ; Linghua Zhang ; Haiying Tian and Guoqin Yuan
"Precise alignment method of time-delayed integration charge-coupled device charge shifting direction in aerial panoramic camera", Opt. Eng. 55(12), 125101 (Dec 08, 2016). ; http://dx.doi.org/10.1117/1.OE.55.12.125101


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