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

Jian Zhang; Yalin Ding; Linghua Zhang; Haiying Tian; Guoqin Yuan

doi:10.1117/1.OE.55.12.125101

8 December 2016 Precise alignment method of time-delayed integration charge-coupled device charge shifting direction in aerial panoramic camera

Jian Zhang, Yalin Ding, Linghua Zhang, Haiying Tian, Guoqin Yuan

Author Affiliations +

Optical Engineering, Vol. 55, Issue 12, 125101 (December 2016). https://doi.org/10.1117/1.OE.55.12.125101

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.

Citation Download 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," Optical Engineering 55(12), 125101 (8 December 2016). https://doi.org/10.1117/1.OE.55.12.125101

Published: 8 December 2016

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available