IMU
Inertial measurement units record the angles and motion of the sensor in flight. These articles explain how the IMU works with GNSS to fix the sensor’s position and orientation, and what happens to the data when either one is weak.
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GNSS and IMU Trajectory Quality
Calibration and strip matching can only be as accurate as the trajectory underneath them. This article looks at what actually determines that accuracy: satellite geometry, base stations versus PPP, and why IMU grade matters.