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. • The gimbals in an INS are mounted inside one another. • Gimbals and torque servos are used to null out the rotation of stable platform on which the inertial sensors are mounted.
Working mechanism of gimbaled INS
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- Spring '18
- Gershon Mukula
- Inertial navigation system, Gyroscope, Gimbal, Gimbaled systems