Difference between revisions of "Direction Cosine"
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Direction Cosine
</dt>
1. The cosine of the angle formed by the intersection of a line, as a line
of sight to an orbiting body, with an axis of a rectangular coordinate system
with the origin on the line.
</dd>
Every line has three direction angles and three direction cosines: 1,
m, n corresponding to Missing Image:img src="SP7-d_files/psism.gif", Missing Image:img src="SP7-d_files/thetasm.gif", Missing Image:img src="SP7-d_files/phism.gif", the direction
angles with the x, y, and z axes.
</dd>
2. Specifically, in tracking, the
cosine of the angle between a baseline and
the line connecting the center of the baseline with the target. [[/a>|/a>
]]
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use