Closed-Loop Estimation of Oscillator g-Sensitivity in a GNSS/IMU System

摘要

We propose a simple method for estimating crystal oscillator g-sensitivity ininertially aided Global Navigation Satellite System (GNSS) receivers. It doesnot require any specific equipment, like GNSS signal simulators or rate tables.The method is based on analyzing closed-loop phase tracking errors. Thisenables us to utilize the actual GNSS signal as the frequency reference,despite the presence of an unknown Doppler shift in it. The method has beensuccessfully applied to the calibration of an oven-controlled crystaloscillator.