Strapdown
Encyclopedia
The strapdown is an alternative to the gimbal
used in inertial navigation system (INS). It is mechanically simpler, but has drawbacks as a result.
Gimbal
A gimbal is a pivoted support that allows the rotation of an object about a single axis. A set of two gimbals, one mounted on the other with pivot axes orthogonal, may be used to allow an object mounted on the innermost gimbal to remain immobile regardless of the motion of its support...
used in inertial navigation system (INS). It is mechanically simpler, but has drawbacks as a result.