Transfer Function Compensation in Gyroscope-Free Inertial Measurement Units for Accurate Angular Motion Sensing

Author

Latt, Win Tun ; Tan, U-Xuan ; Riviere, Cameron N. ; Ang, Wei Tech

Author_Institution

Dept. of Comput., Imperial Coll. London, London, UK

Volume

12

Issue

5

fYear

2012

fDate

5/1/2012 12:00:00 AM

Firstpage

1207

Lastpage

1208

Abstract

Gyroscope-free inertial measurement units have been gaining popularity in applications such as motion sensing of handheld microsurgical instruments. Various accelerometer placement configurations have been proposed in the past. However, the effect of nonidentical transfer functions of accelerometers on the accuracy of angular motion sensing has been underestimated and never been taken into consideration. In this letter, significant effect of different phases at different accelerometer outputs due to nonidentical transfer functions on the accuracy is highlighted, and a method is proposed to make the transfer functions of all the accelerometers identical. Effectiveness of the method is confirmed with an experiment using ADXL-203 accelerometers.

Keywords

accelerometers; angular velocity measurement; biological techniques; error compensation; gyroscopes; inertial systems; microsensors; transfer functions; ADXL-203 accelerometers; accelerometer placement configurations; angular motion sensor; gyroscope free inertial measurement unit; handheld microsurgical instruments; nonidentical transfer functions; transfer function compensation; Acceleration; Accelerometers; Accuracy; Instruments; Measurement units; Sensors; Transfer functions; Accelerometer transfer function; angular motion; gyroscope-free; inertial measurement unit; phase difference;

fLanguage

English

Journal_Title

Sensors Journal, IEEE

Publisher

ieee

ISSN

1530-437X

Type

jour

DOI

10.1109/JSEN.2011.2165057

Filename

5985464