An on line self-testing for Coriolis vibratory gyroscopes (CVGs) is realized according to a digital readout electronics for capacitive sensors and micro-machined angular rate sensors. By applying some additional signals to the micro machined structure, the actual noise performance (<0.1°/s) is not worsened. The running of the primary and the secondary oscillators of CVGs is verified by self-testing. Compared with other methods, the device needs not to check the functionality. In this new approach the on-line testing is conducted at any time without disturbing the normal operational mode. Based on the approach the performance of the micro machined gyroscope can be improved and a secure availability of the functionality of the micro-machined angular rate sensor is guaranteed. Furthermore, the error signal is generated when the sensor works incorrectly.
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