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Questions tagged [accelerometers]

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2 votes
1 answer
460 views

How to calculate initial Rotation Matrix/ Euler Angles/ Quaternion for IMU data (gyroscope and accelerometer)?

I am trying to develop a code to track vehicle using GNSS/GPS data (NMEA) and IMU data (Gyroscope x,y,z; accelerometer x,y,z) i.e. dead reckoning using kalman filter. I know there's enough literature ...
Kanika's user avatar
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7 votes
3 answers
642 views

Term disambiguation: acceleration with/without gravity

I'm ashamed to ask this. But a free-falling accelerometer in a gravitational field will read a nice round zero. And if that accelerometer is given some thrust, it will read the acceleration produced ...
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4 votes
2 answers
1k views

Correcting Accelerometer Readings when Offset from Center of Mass: How?

A follow-up to an earlier question. So I've accepted that I need to correct my accelerometer readings for the accelerometer offset from the center of mass. The offset means that whenever the rocket ...
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0 votes
0 answers
23 views

Which nD accelerometer symmetric configurations on a cubical LEO spacecraft can serve as a makeshift 3D gyro resolving tumbling from tidal forces?

As they often do @DavidHammen's comment has got me thinking about the following question, which is a mathematical exercise rather than a realistic scenario. On a hypothetical large cubical spacecraft ...
uhoh's user avatar
  • 149k
3 votes
1 answer
318 views

Compensating for rotation when accelerometer not at center of mass?

It's dawned on me that the accelerometers of a rocket will generally not be at the center of mass. In part because the center of mass varies widely as fuel is consumed. This means the acceleration (or ...
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2 votes
1 answer
172 views

Space shuttle position and velocity calculations from IMUs?

How were the space shuttle's rate gyro and accelerometer outputs converted into reliable position and velocity vectors before being fed into GNC software? Is there a document detailing those ...
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