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kOS Software-Defined Inertial Measurement Unit


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I'm trying to write a software-defined IMU program in kOS using the stock accelerometer sensor. It measures acceleration, integrates to find velocity, and integrates again to find position. Unfortunately, the coordinate system that kOS is using makes no sense. How do I make my own ship-centered coordinate system with X pointing east, Y pointing radially up, and Z pointing north? And, since the origin is at the center of the ship, will that make all accelerations in that reference frame zero since it can't accelerate relative to itself?

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