Which of the following is a four element entity consisting of a scalar and a vector and is used to describe strapdown system rotation?(a) Directional cosines(b) Directional sines(c) Quaternion(d) TriternionI had been asked this question during an interview for a job.The query is from Strap Down and Gimballed Inertial Navigation Systems topic in portion Satellite Radio Navigation& Inertial Navigation of Avionics

Which of the following is a four element entity consisting of a scalar

1.	Which of the following is a four element entity consisting of a scalar and a vector and is used to describe strapdown system rotation?(a) Directional cosines(b) Directional sines(c) Quaternion(d) TriternionI had been asked this question during an interview for a job.The query is from Strap Down and Gimballed Inertial Navigation Systems topic in portion Satellite Radio Navigation& Inertial Navigation of Avionics
Answer» The correct option is (c) QUATERNION For explanation I would SAY: Describing rotation motion in the strapdown system employ more than the minimum three parameters. A quaternion is a four element entity ting of a scalar part and a vector part. It DEFINES the INSTANTANEOUS axis of rotation.

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