Reducing zero offset of MEMS sensors under thermal hysteresis conditions

Abstract

This paper investigates variations of zero offset of MEMS sensors under thermal hysteresis conditions. An experiment was carried out to study the characteristics of zero offset at a constant ambient temperature, abrupt (2 degrees per minute) heating up and abrupt cooling down. A method for identifying zero offset component dependent on thermal dynamics is described. A calibration methodology for this component is proposed for the initial zero offset and zero drift under different thermal dynamics conditions. Application of said methodology is considered for two output information options: direct gyroscope and accelerometer readout and navigation system parameters based thereon (orientation, linear velocities and coordinates).