An inertial reference and navigation system is a "strapdown" system when:
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A
only the gyroscopes, and not the accelerometers, are fixed regarding to the aircraft`s body axes co-ordinate system.
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B
the gyroscopes and the accelerometers are fixed regarding to the aircraft`s body axes co-ordinate system.
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C
the gyroscopes and the accelerometers are mounted on a stabilised platform.
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D
only the gyroscopes, and not the accelerometers, are mounted on a stabilised platform.
The Inertial Reference System (IRS) receives data from three Ring Laser Gyros (RLGs), and three internal accelerometers measuring accelerations on all three aircraft’s body axes (longitudinal, lateral, and normal). The IRSs are of the strap down principle – they are attached to the aircraft fuselage, so the acceleration measurements are coordinated with the aircraft’s body axes (pitch, roll, yaw).
On the other hand, the INS is a stand-alone platform aligned with the local vertical (=gravity) where the accelerations are measured in an axis co-ordinate system which is free from the aircraft’s body axis coordinate system.
On the other hand, the INS is a stand-alone platform aligned with the local vertical (=gravity) where the accelerations are measured in an axis co-ordinate system which is free from the aircraft’s body axis coordinate system.
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Azerbaijan1
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