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...

Navigation in autonomous vehicles involves integrating measurements from on–board inertial sensors and external data collected by various sensors. In this paper, the computer–frame velocity error model is augmented with a random constant model of accelerometer bias and rategyro drift for use in a Kalman filter–based fusion of a lowcost rotating inertial navigation system (INS) with external pos...

This paper presents a comparison between two approaches to sensor dibration. A c c o r d i to one approach, cnlled explicit, an estimator compares the sensor readiags to reference rendings, auad uses the difference between the two to estimate the calibration parameters. Accordii to the other approach, called implicit, the sensor error is integrated to form a different entity, which is then comp...

We present how the laser diode (LD) current tuning induced intensity modulation affects the performance of an open-loop resonator fibre optic gyro (R-FOG) with sinusoidal wave modulation. The expression for the demodulation curve under intensity modulation caused by the dynamic input rotation angular rate and varied environmental factors induced resonance frequency drift is provided. Numerical ...

An improving structure for resonance optical gyro inserting a Mach-Zehnder Interferomete (MZI) into coupler region between ring resonator and straight waveguide was proposed. The different reference phase shift parameters in the MZI arms are tunable by thermo-optic effect and can be optimized at every rotation angular rate point without additional phase bias. Four optimum paths are formed to ma...

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...

Accurate measurements of the Earth’s rotation rate can be obtained by using high quality gyroscopes, such as ring laser gyros (RLG) included in tactical grade inertial measurement units. However, such devices are bulky and expensive. As the Micro-Electro-Mechanical System (MEMS) technology has evolved rapidly during the last years, accurate low-cost gyroscopes are now available. Are the new MEM...