Sagem Coriolis Vibrating Gyros: A vision realized

Abstract

In the early 90's, the concepts chosen by Sagem for his future CVG (Coriolis Vibrating Gyros) developments were based upon three main key principles: · An axisymmetric resonator · A finely balanced resonator · A Whole Angle mode of control. After more than two decades of experience, these visionary choices have proven to be well-grounded. They led to continuous improvement of the company know-how for the benefit of the performances. Associated with the ever-increasing computing power of microcontrollers, it is even possible to continue to improve the performances of the early versions of the Sagem CVGs. The paper shows how these main principles have been applied to Quapason™, to HRG and more recently to advanced high performance MEMS gyro and presents the more recent tests result obtained. The high versatility of the CVG concept is shown through a description of typical applications relying on its key characteristics.