Questions tagged [quaternion]

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3
votes
1answer
94 views

Should coordinate transformations from J2000 to ITRF93 in quaternions be cyclic?

I used SPICE's pxform at an interval of epochs to determine the transformation from J2000 (inertial) to ITRF93 (Earth body-fixed) frame. Then, I converted these rotation matrices to quaternions with ...
2
votes
0answers
90 views

Finding reference quaternion of a satellite in orbit

How can i find the reference quaternion of a satellite after it has detumbled? I need the quaternion to be able to successfully actuate my payload, which in this case will be a hyperspectral imaging ...
4
votes
2answers
407 views

How should the ISS telemetry for attitude be converted to roll, pitch, and yaw?

NASA, via Lightstreamer SRL, provides four "quaternion components" for the International Space Station's current attitude. These are labelled USLAB000018–21 and described as "US Current Local Vertical ...
18
votes
1answer
5k views

What are quaternions and how are they used to represent spacecraft dynamics?

The title says it all. Quaternions are widely used to represent the orientation of a spacecraft. Why is that, and how do quaternions compare to other alternatives?