In a stabilised platform inertial system, the accelerations are measured in an axis co-ordinate system which is… (NB: aircraft`s body axis co-ordinate system = pitch, roll and yaw axis)
EASA are referring to a stabilised platform INS when they call something an inertial navigation system, review the learning objective below. These are systems that, once aligned, have a platform that remains level and pointing towards the North (free from aircraft's axes), which is controlled by rate-integrating gyros and servo motors to keep the platform in that orientation.
By inputting the initial location when the INS is aligned and kept still, the system can then track every acceleration in the North/South and East/West axis to keep a track of speed and therefore distance travelled along those axes.
Learning Objective 022.05.01.01.03: State that earlier gyro mechanically stabilised platforms are (technically incorrectly but conventionally) referred to as inertial navigation systems (INSs) and more modern fixed (strap down) platforms are conventionally referred to as inertial reference systems (IRSs). INSs can be considered to be stand-alone, whereas IRSs are integrated with the FMS.
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