Recently, fiber optic gyros with very low drift rates have become available and affordable. Because of their low drift rate attention is warranted to sources of errors that were previously considered as of secondary importance. In the KVH E-Core RD2100 gyros, we found that the temperature dependency and the non-linearity of the scale-factor caused significant errors. A precision calibration pro...

The mobile robot localization problem is treated as a two-stage iterative estimation process. The attitude is estimated rst and is then available for position estimation. The indirect (error state) form of the Kalman lter is developed for attitude estimation when applying gyro modeling. The main bene t of this choice is that complex dynamic modeling of the mobile robot and its interaction with ...

This article presents the details of a newly constructed 3-dof experimental spacecraft simulator facility at the School of Aerospace Engineering at the Georgia Institute of Technology. The main component of the facility is a cylindrical platform located on a hemi-spherical air bearing that allows friction-free rotation about three axes. The facility includes a variety of actuators and sensors: ...

Patients with vestibular hypofunction often experience dizziness and unsteadiness while moving their heads. Appropriate sensors can effectively detect a patient's dynamic visual acuity and associated body balance control. Forty-one vestibular-deficit patients and 10 normal individuals were invited to participate in this study. Questionnaires, clinical assessment scales and objective measures we...

Magnetometers combined with inertial sensors are widely used for orientation estimation, and calibrations are necessary to achieve high accuracy. This paper presents a complete tri-axis magnetometer calibration algorithm with a gyro auxiliary. The magnetic distortions and sensor errors, including the misalignment error between the magnetometer and assembled platform, are compensated after calib...

A method for reconstructing shape of an object from its silhouette using a mobile camera to which a gyro sensor is attached is proposed. In order to determine unknown camera positions at which images are taken, the pose information of the camera derived from the attached gyro sensor as well as silhouette of the object are used. An algorithm for computing the camera positions by an iterative pro...

An artificial landmark-based, automatic navigation system was developed for a small-scale field robot. Several low-cost sensing techniques were involved in the system to detect surroundings and determine the position of the moving robot. Several tests were conducted to evaluate the accuracy of linear distance and angular displacement using dead-reckoning with a gyro-correction, overall performa...

The MEMS gyroscope zero drifts dominantly affects measurement accuracy of gyroscope. For the nonlinear problem that MEMS gyro zero drift varying with the temperature changes, the wavelet transform was performed to filter the static experiment zero drift data, then the zero drift was investigate by combing with the improved grey prediction theory. Finally a temperature compensation model based o...

In general, the information of mass properties is required to control a spacecraft. The mass properties, mass and inertia, are changed by some activities, e.g., consumption of propellant, deployment of solar panel, sloshing, etc. Various estimation methods have been studied to obtain the accurate mass properties. The gyro-based attitude data including noise and bias needs to be compensated for ...

Complete attitude control of a spacecraft is not possible with only one single-gimbal variable-speed control moment gyro due to the conservation of angular momentum. However, partial attitude control without violating the angular momentum conservation principle is still possible. In this paper feedback controllers using only one singlegimbal variable-speed controlmoment gyro are presented that ...