Pointing Bias in “Spatial Matched Filter” Beamforming at a Tri-Axial Velocity-Sensor due to Non-Perpendicular Axes
Chibuzo Joseph Nnonyelu · World Journal of Innovative Research · 2018
This paper investigates how non-perpendicularity in a tri-axial velocity sensor would affect the tri-axial velocitysensor's azimuth-elevation beam-pattern in terms of the beam's pointing direction and directivity.The vertical axis was adopted as the reference axis for the analysis and a rotation matrix developed to represent the non-perpendicularity in Euclidean space.The beampattern of this deformed tri-axial velocity sensor is then analytically studied.It was found that the nonperpendicularity does not affect the overall shape of the beampattern, but only introduces a pointing offset.Also, the non-perpendicularity imperfectionreduces the directivity of the imperfect triaxial velocity sensor relative to a perfect case.This finding developed in closed the pointing bias for the described deformity hence serves for non-iterative post data acquisition correction.