Accession Number : AD1019028

Title :   Angular Random Walk Estimation of a Time-Domain Switching Micromachined Gyroscope

Descriptive Note : Technical Report

Corporate Author : Space and Naval Warfare Systems Center Pacific San Diego United States

Personal Author(s) : Sabater,Andrew B ; Swanson,Paul

Full Text :

Report Date : 19 Oct 2016

Pagination or Media Count : 23

Abstract : Microelectromechanical systems (MEMS) gyroscopes could potentially be used in low cost, size, weight, and power (CSWaP) navigation-grade inertial navigation units, but current solutions cannot be used due to issues with angular random walk (ARW), bias instability, and scale factor instability. While there are methods to address issues with bias and scale factor instability, with the commonly used demodulation schemes, ARW is limited by the ability to produce resonators with very high quality factors. Given that producing resonators with very high quality factors is challenging, the time-domain switching micromachined gyroscope (TDSMG) is proposed. As opposed to the conventional means that employ electrostatic sensing, the motion of the proof mass is detected through switches at known locations. In conjunction with an accurate time interval analyzer, the TDSMG is capable of estimating rotation rate in a low-noise fashion that is robust to environmental effects. Thus, it is expected that it will have low bias and scale factor instabilities. Simulated ARW performance of a particular incarnation of the TDSMG is studied. It is found that with narrow-bandwidth restrictions, near navigation-grade performance is capable without the need for the resonator to have a very high quality factor.

Descriptors :   microelectromechanical systems , inertial navigation , resonators

Distribution Statement : APPROVED FOR PUBLIC RELEASE