Question

Which one of the following is not a purpose of strapdown calculations?

(a) Calculate vehicle’s attitude

(b) Transform accelerometer measurements into navigational coordinates

(c) Perform dead-reckoning computations

(d) Provide inputs to air data computer

I got this question in examination.

This intriguing question comes from Strap Down and Gimballed Inertial Navigation Systems in portion Satellite Radio Navigation  & Inertial Navigation of Avionics

Answer 1

Right choice is (d) Provide inputs to air data computer

Easiest explanation: The purpose of strapdown computations are to calculate the vehicle’s attitude relative to the navigational coordinates using the gyro measurements, to transform the accelerometer measurements from vehicle axes into navigational coordinates, and to perform the dead-reckoning computations. Air data computer is independent of inertial navigation system.