The Application of Spherical Triangle Method in Digital Zenith Camera
The Second Artillery Engineering University, 2 Tongxin Road, Xi’an 710025, China
Abstract The tangent plane method is often used to calculate the astronomical coordinates of the target point. However, star error can affect the the precision of orientation easily. Moreover, the method is relatively slow. In order to improve the precision of the target point, we introduce a new method of spherical triangle, which can make full use of the star information. Thus, both precision and the speed are improved.
Key words ：
digital zenith camera
spherical triangle
precision of orientation
convergence speed
Received: 10 July 2014
Published: 29 July 2015
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