What instrument is used to measure angular accelerations around pitch, roll, and yaw axes?

The instrument that measures angular accelerations around the pitch, roll, and yaw axes is the gyroscope. Gyroscopes are designed specifically to detect rotational motion and changes in orientation. They provide critical data about how an object is moving in three-dimensional space by measuring the rate of rotation around each of the specified axes.

This capability is essential for stabilizing and controlling the flight of small unmanned aircraft systems (sUAS) since it allows the control systems to maintain the desired attitude and maneuverability. In contrast, accelerometers measure linear acceleration, which is different from rotational changes. Magnetometers detect magnetic fields and are primarily used for navigation purposes, while barometers measure atmospheric pressure, which can be useful for altitude determination but is unrelated to angular motion.