Temperature Compensation of Null Signal Bias and Scale Factor Drift of Low-Cost MEMS Gyroscopes

Abstract

Reducing the temperature-induced error in MEMS gyroscopes will increase their accuracy and may allow them to be used in high-precision applications. The simplest models of the temperature dependence of the null signal bias (gyro output when there is no rotation about its axis) and scale factor (Volts/degree/second) are linear, modeling the needed correction as the product of a temperature dependence parameter and the temperature difference from the reference temperature. Once the temperature dependence parameters have been measured, they may be used to improve the gyro's accuracy and precision. This work describes the determination of the temperature dependence parameters and their employment to more accurately measure the earth's rotation rate.