What is the difference between ins and irs

You also needed radio updating. You usually find them on airplanes that have a Performance Management System as well e. Hope this helps. Fai Jai. Page 1 of 2 1 2 Last Jump to page:. Accommodation Anything Goes Introduce yourself Replies: 10 Last Post: February 7th, , Replies: 3 Last Post: May 17th, , Replies: 8 Last Post: October 10th, , Written and maintained by actual pilot examiners and master CFIs.

The World's Most Trusted eLogbook. Be Organized, Current, Professional, and Safe. Highly customizable - for student pilots through pros. Free Transition Service for users of other eLogs. Alignment times vary depending on the technology in use and the accuracy required from the INS.

Alignment will normally require the input of certain data from another system or from a manual entry. Accurate alignment is essential if the INS is the sole means of navigation for any length of time without external position updates available. Alignment can be achieved independent of any external data; this is known as self-alignment.

Or, the alignment process can be speeded up with data supplied from a GPS or other systems, and even manual entry. This alignment of position and orientation is an iterative process, each relying on the progress of the other.

Of the many different designs of INS, each with different performance characteristics, there are two main categories used in aircraft: stabilised platform and strap-down. This platform is driven by gyros two or three to always maintain its alignment with these axes regardless of any movement of the aircraft. Analogue feeds can be taken directly from the accelerometers and gyros that are in direct proportion to acceleration, and changes in velocity and direction.

A minimum of two accelerometers is used, one referenced to north, and the other referenced to east. In older units, they are mounted on a gyro-stabilized platform. This averts the introduction of errors that may result from acceleration due to gravity. An interface control head is used to enter starting location position data while the aircraft is stationary on the ground. This is called initializing.