GIMBALED_INS.pptx - GIMBALED INS Stabilized Platform and...

GIMBALED INS

Stabilized Platform and Strap-down
Technologies

There are many different designs of INS with different
performance characteristics, but they fall generally into two
categories:
– gimbaled or stabilized platform techniques, and
– strapdown

The original applications of INS technology used stable
platform techniques. In such systems, the inertial sensors
are mounted on a stable platform and mechanically isolated
from the rotational motion of the vehicle.

Platform systems are still in use, particularly for those
applications requiring very accurate estimates of navigation
data, such as ships and submarines.

Stabilized Platform and Strap-down
Technologies

Modern systems have removed most of
the mechanical complexity of platform
systems by having the sensors attached
rigidly, or “strapped down”, to the body
of the host vehicle.

The potential benefits of this approach
are lower cost, reduced size, and greater
reliability compared with equivalent
platform systems.

The major disadvantage is a substantial
increase in computing complexity.

Gimbaled inertial platform

Gimbaled systems
•
A gimbal is a rigid with rotation bearings for isolating
the inside of the frame from external rotations about
the bearing axes.
•
At least three gimbals are required to isolate a
subsystem from host vehicle rotations about three
axes, typically labeled roll, pitch , and yaw axes.