A filter for estimating spacecraft attitude quaternion and gyro drift from vector measurements in the presence of white noises in the gyro error, in the drift dynamics, and in the line-of-sight measurement error is developed. The variance parameters of the white noises are unknown, and are modeled as non-anticipative second order stochastic processes. The approach taken in this work consists in...

Bell-shaped vibratory angular rate gyro (abbreviated as BVG) is a new type Coriolis vibratory gyro that was inspired by Chinese traditional clocks. The resonator fuses based on a variable thickness axisymmetric multicurved surface shell. Its characteristics can directly influence the performance of BVG. The BVG structure not only has capabilities of bearing high overload, high impact and, compa...

Title of Thesis: ADVANCED OVERMODED CIRCUITS FOR GYRO-AMPLIFIERS Degree candidate: Yingyu Miao Degree and year: Doctor of Philosophy, 2004 Dissertation directed by: Victor L. Granatstein Professor Institute for Research in Electronics and Applied Physics Department of Electrical and Computer Engineering Thomas M. Antonsen Professor Institute for Research in Electronics and Applied Physics Depar...

Abstract We analyze the undulator and gyro-synchrotron radiation of devices by equating number periods helical trajectory gyrating motion to periods. The gyro is characterized cyclotron resonance maser interaction exhibits superior line width quality but higher sensitive beam energy spread when operated at tera-hertz due finite larmor radius effects.

Received December 11, 1990; revised manuscript received April 30, 1991 A pulse-excited Sagnac fiber interferometer can perform squeezing. If this squeezed radiation is injected into a second Sagnac interferometer that is functioning as a fiber gyro that is itself nonlinear, additional unfavorable squeezing occurs in the gyro. By proper phase adjustment of the injected squeezed radiation it is p...

The gyrotron backward-wave oscillator (gyro-BWO) features broadband tunability, but ragged tuning curves are frequently observed experimentally. Accordingly, a Ka-band gyro-BWO experiment with external circuit mismatch was conducted to examine its tuning properties at two reflected strengths: one is slightly mismatched (15 dB reflection) and the other can be categorized as matched (30 dB reflec...

This paper deals with the construction of nonlinear observers for navigation purposes. We first present a globally exponentially stable observer for attitude and gyro bias, based on gyro measurements and two or more pairs of vector measurements. We avoid the well-known topological obstructions to global stability by not confining the attitude estimate to SO(3), but rather estimating a full rota...

Hot magnetic stars often exhibit incoherent circularly polarized radio emission thought to arise from gyro-synchrotron by energetic electrons trapped in the circumstellar magnetosphere. Theoretical scalings for electron acceleration reconnection driven centrifugal breakout match well empirical observed luminosity with both field strength and stellar rotation rate. This paper now examines how in...

First, this paper proposes a static north-seeking mode based on the meridian seeking torque of gyroscope. We analyze the force situation and stability of the gyro magnetic suspension system in this mode and focus on the principle of torque balance feedback control technology. Two-position rotary control technology has been designed based on the sensitive state of the gyro rotor in four special ...